Conscientious Objector Looking model can stand up rough-andtumble AMA Cate gory II Ill competitionand win robust rubber-powered Mul vihill good bet EBill Baker MOST MULVIHILL DESIGNS have published seem intended Category competition five-minute maxes judge relatively large fragile struc tures designed succeed events flown under AMA Category II III rules knew contests Id flying would involve windy weather small rough fields time Category II III rules would hold three- twominute flight times first three flights Conscientious Objector somewhat smaller typical Mulvihill design its also much less fragile model ca pable five minutes early morning air wont much good wing folds first windy flight gets beat shreds push five maxes just reach requirement five-minute max model competitive Id hoped will three minutes easily tactic fly early getting first three four flights before wind downdrafts strengthen try pick up some lift four- five-minute maxes Most competition will elim inated thensometimes can look back half-century model building Ive enjoyed being involved nearly facet hobby Ive flown CL RC mostly sport flier course have flown practically type Free Flight model known Most competition flying has Free Flight concentrating Gas events dropped out Free Flight about 1964 flew RC until 1976 Around time old Free Flight urge crept up again attended contest see what changed decided would fun learn new event like Rubber rather falling back old Gas groove happened long before Bob Dunham published Draft Dodger April 1975 issue Flying Models Id long awe Dunhams great-flying Rubber models Draft Dodger im mediately claimed interest Mass-produced Draft Dodger parts tum bled out workshop like Henry Ford cars point early process counted three wings five fuselages four stabs four props just keep two mod els flying competition surprise novice Rubber flier time models flew very well win ning contests 1979 started making few changes important rolled balsa tube fuselage did nothing im prove performance fuselage much less prone damage also rede signed wing mount modifications added up very practical Category Ill w model dubbed Conscientious Objec tor because wasnt exactly Draft Dodger anymore took both stock Draft Dodger newly evolved Conscientious Objector 1979 Nationals CO very high pitch prop giving longer slower climb contrast explosive power burst generated low-pitch prop Draft Dodger Wind conditions very strong blowing right across ocean corn two planes allowed event strat egy fly Draft Dodger first four flights knowing within three min utes would either corn OOS out-of-sight would likely lost fourth flight held Conscien tious Objector reserve fifthand hoped winningflight strategy worked though 74 Model Aviation Above The author showing off Conscientious Objector wheatfield near Norman OK No oil well background Isnt Bills probably wouldnt object owner bequeathed him Below authors iong-sufferlng hungry wife Paula holding up model show its lines promise lunch soon ordeal over Draft Dodger damaged after flight mostly wing mount damage diagonals broken out its explosive climb rate model flew through ground turbulence slower climbing Conscientious Ob jector wouldnt have able cope Still using tubular fuselage contin ued adapt Conscientious Objector un til virtually no remaining parts identi cal Draft Dodger guess difference between plagiarism research sources borrow adapted prop published years ago Frank Parmenter borrowed stabilizer structure Bob Whites Twin Fin also used simple Z-bar-type propeller hub copied wing mount few other ideas Jim OReilly invented better winding hook worked out sim ple reliable dethermalizer setup probably owes something lot differ ent people tried longer motor tubes va riety wings some area dif ferent dihedral schemes others differ ent airfoils experimented sev eral propellers model presented represents what judgment best compromise achieving key objective Mulvihill thats competitive Category III might want increase wing area 300 sq motor tube 42 model will serve flyoff five minute rounds Category may also want increase propeller diameter half-inch 95% Mulvihill flying done US model pre sented very competitive After 1979 AMA Nationals win Draft Dodger flew two Na tionals under Category III rules placed both third fifth time Conscientious Objector failed place Nats event surprise flown under Category rules As time went interests shifted Old-Timer events began attending SAM Champs instead AMA Nats Nevertheless continued well Conscientious Objector local re gional contests until found myself unable meet physical demands Free Flight competition present Im enjoying RC Sailplanes Conscientious Objector has permanent niche affections Id like think somewhere someone will flying Category III Mulvihill winning Construction motor tube fuselage houses mo tor also holds other parts air plane proper relationship another Though several fuselages built square cross section found tube config uration has best strength-to-weight ratio Use A6 x 4-in-wide 6- 8-lb A-grain balsa Make sure wood uniform density grain through entire length piece its much harder edge other transitions C-grain dont use Using metal straightedge trim sides true Seal wood side two coats Deft semigloss clear dope Sand gently between coats dry wet entire piece water will cause curl unpainted side expands Form wet balsa around 1 A-in-dia dowel after first scoring line down center dowel align balsa Largediameter dowels can procured hardware store lumber supply company believe theyre intended clothes closet hanging rods Jim OReilly once suggested using fluorescent tubes form motor tube Fearing would fall off ladder dur ing construction opted wood dowel Its also easier carve tail cone wood Ever try carving fluorescent tubing Wrap wood gently strips cloth gauze Ace bandage let dry Remove wood dowel apply Titebond along edges draw together Secure bits masking tape allow dry Make one-inch-wide nose doubler tail doubler about 1 wide simi larly prepared balsa doublers will Left Looking underside wing mount can see two lengths oil/a x 1A-in balsa used key wing pylon mount piece glued side wing pieces also serve fill gap between top pylon bottom undercambered wing Right Construction details wing mounting pylon side rails I/ x % spruce An easy way shape base pylon wrap sandpaper around motor tube sand pylon base perfect before final installation September 1990 75 Close-up view simple effective reliable dethermalizing mechanism motor peg tube fuse tube aluminum drink can heat sink can seen fuselage forward fin Small pieces %-in aluminum tubing serve guides limit line slip inside tube Glue place Titebond similar product sure let aft doubler protrude tube about youll have something glue tail onto tapered end forming dowel plane rasp easily form tail cone amount taper isnt crit ical 1 /4 narrowing 34 about right Make circular former hard -in balsa two cross-grained /16 pieces Fit former inside aft doubler end motor tube will prevent damage tapered cone should motor break Place another -in former area SHOC mount multifunction stabilizer mount attributed Sky Hoppers ange County California Dont worry rolled tube isnt per fectly circular Lay table allow roll until stops Let flat spot side top bottom 900 discernible curvature tube let concave side bottom joining tail cone eyeball closely can isnt perfect cone mount top forms straightest line motor tube motor pin must strong since tre mendous force exerted upon pin must course removable order change motors Use least A-in pin 1/2 SOFT BALSA WING TIP 9 SECTION DIHEDRAL BREAK RAISE T P 4 1/4 1 22I ZV LLI Ii 1/16 BAlSA SHEET 00155 DIGS 3/32OSIIRI S I/IA WIRESLIM ThBE RINK HOLE THIS LINE PARALLE 1/32PLYTO ESSE OF BLOCK PROP ERN n OCT COTTOM CC TOO TO MANO MRPOL SDOPE FRORT THIN TOrISOL CORNER TOIC4 TDICN AT HOC COIRT S THIRDSTOOL PROP BLADE CROSS SECTIONS NOT TO SCALE 3/32OIA3/5 015 HOLE HOLES /5 ALJMPJJM WINDING HOOK NOTE 3/64 TO 116 DOWN THRUST FOSELASE IS TJBE MADE BALSA SHEE 76 Model Aviation proplhub/nose block mechanism offset slot motor tube clearly seen offset makes impossible mount nose block upside down plastic press-on wheel collars attach blade Z-bar must leading edge theyll thrown off along blades creating lot noise very little thrust crashed airplane Another view prop/hub/nose block assembly showing doubled blade hinge assembly Zbar spring bearing motor hook Complete instructions carving blades nose block fashioning hub mechanism included text clearly detailed plan Finished aluminum hubs function just well can purchased through FAI Model Supply Wing jigs important especially mass-producing wings jig building wing shown plan background foreground jig polyhedral variant prop/hub/nose block assembly attached motor tube Note blades fold flush against tube its important fold way back against shown stay way during glide Otherwise glide trim will thrown off Full-Size Plans Available. See Page 196 I/IA I/A HALSA WEBS 1/B BALSA SPAR NO DIHEDRAL BREAK AT CENTER LINE WIN~ PlAN I4 SO BALSA LEADING EDGE DIHEDRAL BREAK RAISE WING TIP 4-1/4 imi~ _[-t___ OUBL TOP 0 3 -- F AR BALSA 29 OF UK BALSA GA HESHEAR WEE AT DIHEDRAL JO/AT LEL I/H HARD BALSA_ IM OP I/3D LEDIHEDRAL WING RIB PATTERN BRACEAIRFOIL IS DUNHAM-BARER- REEHOK 00KGOLDBERG PASTIC IDE OFZ AGR AS THE WHEEL OLLAR FAI MODEL SUPPLY RGLL TEREARING AND SPRINO 3D PLO NCE WREI/IA ID TUBE GAVB SPRUCE KES HEW WITH EMOVED NOSE/PROP DETAILI/IA BALSA SHEET S/A UPRJCE I/RBALSATF-I B F-B SHEET___________ F-234 aUNT WINS INCIDENCE 0 ICALE Ir\IIilIIIIITi~ F-I FOED CUFHF5 I/B 3/IA SPRCE RAILS / FUSELAGE SIDE VIEW I/H GO BALSA DOG BLER I/A BALSA SHEET GUSSETS /H SG RGLSA LE I/H SO EALSA DOUBLER I/A RALSA4 \JL/ N SHEET TP END IEW I/H BALSA SHEET RIBS AT DIHEDRAL BREAK 1/ H PLY I/IA BALSA VIA BALSA SHEET/64 PLO I/3D HALSA SHEET SHEAR WEBS STAB STAB DIAGONAL I/IA BA3A SHEET PROP BEARING DETAIL NO SCALE TWO I/H HALSA SHEETS CROSS URANED ALUM SODA CAN HEAT SINE BOTH I/A DIASIDES MOTOR PIN NOTE COMPLETE MODEL RTF WITH MOTOR THEN GLUE WING MOANT ON WITH ARKED ON WING MOUNT OVER ACTUAL C S I/B I/IA BALSA SPARS TOP AND BOTTOM STABILIZER VIE BALSA RIBS /8 50 BASA- TRANS EDGE I/IA HASA DI AS ON ALS I/H BALSA SHEET 1/4 BALSA INCIDENCE BLOCK-TRIM FOR RUDGER TAB -DD TO -3 INCID I/A EFT I/lA PLY SHOC MOUNT 1/H ALUM TUBE CRIMP ALUM TUBE 1/4 BALSA I/H BALSA I/ADD ALUM TUBE THRA FUSELAGE /16 BALSA SHEET DOURLER PAPER CLIPCRIMP ALUMTRACING BY OE DEMARCO HOOKTUBE MODEL ATION CONSCIENTIOUS OBJECTOR DESIGNED BY BILL BAKER reinforce tube holes made fin can made %-in light sheet balsa save weight cant find four- six-pound sheet built-up fin could used course would prone battle damage install fin lay tube its side flat table Block up fin books pieces wood its centered tube parallel table glue place As long fin parallel direction flight symmetry tail cone critical Ron Robertti once told tail aint straight retorted thing needs turn anyway Covering fuselage cover tubes tissue sometimes silk Ive also used polyester cloth intended dress making Its very tough comes pretty colors wrinkles can elimi nated through heat shrinking down side its little heavier other materi als next tube Id like try O6-oz fiberglass cloth clear dope adhe sive dont usually cover tail cones fins would use tissue did un covered areas including prop usu ally finished Deft semigloss wood filler/sealer available hardware store stabilizer quite conventional Its also lightweight trouble-free Note both leading trailing edges made A-in-sq stock Round off leading edge put slight taper trailing edge Beauty second ary lightweight warp-free construc tion model flying speeds slow wide sharply tapered trailing edge would simply excess weight Hence truncated trailing edges used both stabilizer wing Note point needed con nect both DT dethermalizer limit line front stab hold-down rubber Also note absence need sheet fill September 1990 77 Continued page 180 Three Mulvihill standouts author Bill Baker left George Perryman center Jim OReilly placed first second third both 1979 1982 AMA Nats ALL STAINLESS STEEL HEAD LITE IItm BEST GLOW PLUG CONNECTOR Stainless Steel HEAD LOCK BEST DESIGNAll Welded No Solder Acid Flux Flexing Wires BEST NiCadField Replaceable 12 AH SANYO 15 AH PANASONIC BEST QUALITY & GUARANTEE MODEL PRODUCTS CORPORATION BEST PRICESt #045-WIO NiCad Charger$ 995 available write directSt #040-With NiCad$ 1595 add $100 $200 outside US St #041-With NiCad & Charger $ 2595 MODEL PRODUCTS CORP RO Box 100 Allamuchy NJ 07820201850-1508 have coloring model planes using method years Unlike Floquil butyrate-jar skimming inexpensive food markets fabric outlets sell Rit dyethe powdered kind comes infinite variety colors can used straight blended just right color use baby food jars mixing Open pouch Rh dye pour few beads jar pour some dope thinner acetone top will surprised quickly thin ner snatches color dye Keep blending using raw balsa sticks test against color sam ple want match Once satisfied add about 20% clear dope mix always put couple thin coats clear dope model first prevent creeping Rit will give lively-looking color saving little jar will allow patching later Just add thinnerthere no pigment Work takes longer tell about FF Scale/Warner Continued page 73 Investigation problem turned up fact Federal Standard screwed up 1964 changed color standard original WW II olive drab new kept old number F534087 confuse modelers restorers make things worse Uncle Sam gave same number very dark brown olive drab March 1979 meant modelers three FS34087s choose January 1984 34087 reappeared original shade gloss semigloss versions OD dark brown version 1979 14087 24087 June 1984 GSA decided straight en things out issued change notice ef fect color chip 34087 dated March 1979 wrong color shall used colors 14087 24087 34087 represent two different colors lors have re numbered follows 14087 now 14084 24087 now 24084 34087 now 34088 makes five matte olive drabs pre-1964 34087 post-1964 34087 March 1979 34087 wrong color 1984 34087 1984 Change Notice 34088 same color later 34087 new FS595B being printed riht now should take care confusion right Dont count Don suggests build Navy aircraft forget about olive drab alto gether case its nice see company concerned about getting right Perhaps thats cause Don perfectionist kind person would balance wheel wheelbarrow Czech submarine contest high points life getting news what other modelers doing Id like share Lubomir Koutnys account contest Czechoslovakia likes drought-ridden Califor nians long Boys Zabreh north Moravia began arrange A0-scale contest little town did very well am sorry weather perfect submarine contest rain damp air very well Scale big perfect varnish like Straniks twin Batman won Other boys give Scales over hot car engine before next flight get idea guess spoiled re member flying guys southern France flew rain shine often packed model boxes cars after sunset Plastic vs rubber have hearing nasty rumors late rubber stored plastic con tainers may deteriorating accelerated rate might due outgassing plastic container have rubber stored type container length time under optimal conditions airtight out heat might want check out let know harm seems have done Im sure other readers would really happy know whether good way store precious rubber motors Well until next time guys gals always re member Dont dope models sandstorms things wont too rough Conscientious/Baker Continued page 77 stab lightweight aligns itseli small notch DT line tht trailing edge action SHOC-typt stab front mount centers leading edgc well enough negating need keying An added advantage system thaI its free move meeting obstruc Man turer Hi Performa utba$Is andraft CULPEPPER C MODELS INC 2526 Washington DubuqmIA 520411 31015834830 180 Model Aviation PRODUCTS FOR THE O4SCERNING MODELER FF Duration/Linstrum Continued page 71 Made America American Technology RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Fot-ster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Coil wrte free information RJL Industries PO Box 5 Sierra Mack-e CA 91025 818 359-0016 Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanshin & Perfomance Serious Horsepower3 0S ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shade Performance Specialties Send $1 00for fully illustrated catalog Available VS Long & Short Stroke 06 Long Stroke 06 6IFSR 06 40 VRP/VF 06 91 VRDF STX-40 Rossi 40 coming soon mare information Call 619 729-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 tion would break keyed stabilizer notched peg holds rubber DT line can made A6 ply popsi cle stick tongue blade wood dowel aluminum tubing peg mounting platform stabilizer should also /~ ply peg must able withstand certain amount strain Wing heavy-duty spar shown plans Ive never broken wing Maybe spar too heavy like up per main spar can made either very hard balsa spruce other spars can medium 8-10-lb balsa shear webbing between spars very important Installing pieces along centers spars shown plan ideal find making full depth locating along side easier adequate -in hard balsa angled center dihedral brace can also made full depth Shim up rib fronts A2 above leading edge small taper cut can made will shape leading edge conform undercambered ribs Shim up rear end ribs trailing edge A2 same reason wing can built jig youre going build several wings jig highly recommended jig used airplane allowed wing built piece except lower spar added air later use jigs dates discovery warps plagued induced during process adding dihedral dont usually shim washout since about washout seems occur auto matically tissue doped wing mount motor tube de signed lightweight rigid platform wing rest quick way achieve perfect fit wrap piece sandpaper around tube lightly sand mount base shape Dont glue wing mount fuselage until model ready fly must adjusted achieve correct CG center-of-gravity After mount glued place make sure theres enough stabilizer tilt produce left turn Propeller may try write detailed arti cle propeller carving soon sub ject has covered thoroughly else Wood selection primary impor tance block should hard about 14 lb uniform density produce blades both thin strong Lay out top bottom profiles making sure centerline top profile parallel edge block same bottom line side profile Set block drill press drill hole hinge Cut out profiles band saw Carve bottom blades first com pletely finishing before starting top sure keep track right left blades once carved six left-handed blades before realized what doing Thank fully wife saved day suggesting carve six right-handed blades Try about /16 undercamber midblade progressing no undercamber tip Begin carving top blade get ting down about A-in thickness Make high point airfoil its helpful mark about one-third chord Take time Carve thin slices chunks Shape blade aft high point sort triangular profile start final shaping leading one-third high point thickest part blade should about /16 tip midblade Add A4 A2 ply doublers /32 OD tubing hinge Place blade Z-bar hub drill holes limiting pins A6 drill mounted pin vice Take extreme care drilling holes blades track properly sight turning blades pro file should perfect alignment other Finish propeller Deft equivalent cant find Deft local hardware store Ive noticed listed Lee Campbells catalog nose plug made A-in sheet balsa laminated cross-grained first lam mate fits inside motor tube sec Electric Flight f Controller Perfect 05 Motors 510 cells 2mooth Has Brake Lightweight 12 Adjastobte switching pointssoney hock Soldertess tenssisot ror easy hookup guarantee ON/OFF Controller $2495 Power save weight very high efficiency ossty O06V loss 77 22x13x63 Colifoneejo residents add 65% $163 Tax Add $100 foe shipping Send Check money order wessaitiHigh Sky Futaha cossoetoc Kansas St #9 othn availableSan DiegoCA 92104 23rd consecutive year covering continues go easier & last longer rest Congratulations Super Coverite September 1990 181 JET bust completely finished authentically detailed poseable 1/8 scale Al QC1Ir pruu209 2244170 II p0 box 5631fresno Ca 93755 II ond should conform outside shape tube brass aluminum tube can inserted plug smaller pieces tubing approximately 1/8 long inserted end form bearings wire prop shaft Use Loc-Tite similar product adhere inner pieces tubing outer tube Use CyA cyanoacrylate glue install completed bearing nose block Add plywood face least large external ball bearing wont crush balsa Use good spring such available through FAI Model Sup ply Dont use ball-point pen spring other cheap alternative might take set Make Z-bar out A6 music wire Use Sta-Brite equivalent hard solder Never trust soft solder hold propeller hub together First balance Z-bar alone attach blades balance again used make batch blades pairmatch according weight simi larity As recall averaged eight 10 grams try dont get confused about right- left-handed blades did winding hook shown plan works quite well rubber will stay cen tered unless Newton wrong dont understand winding hooks winding tubes stooges other aspects rubberpowered model technology buy Don Ross book Rubber Powered Model Airplanes AMA Supply Service catalog motor made up enough 34-in strands weigh 85 90 grams dry Consis tency whats wanted should no slack used size motor Mulvi hills nearly Old-Timer Rub ber models such Lanzo Stick Korda Dethermalizer may able everything thing did learn wind motor consistently Trying get used different motors dif ferent models can very stressful con test time Life John Wayne says movie Iwo Jima tough its tougher youre stupid Keep simple Choose motor get used Youll make fewer stupid mistakes under pressure competition Trimming balancing center-ofgravity shown plan best allaround thermal windy weather flying flying early morning still air CG could moved slightly aft decalage reduced model designed stability reliability rather absolute max imum performance Set SHOC stabilizer mount about /l6 tail cone making careful cuts Zona saw removing wood tween cuts create flat spot sup port mount should tilt slightly right making left tip about er right wing mount should have no inci dence relative motor tube deca lage established angle stabi lizer sitting aft block under its trail ing edge angle should two three degrees about / higher trailing edge Glue wing mount place mo tor loaded making sure balancing mark 6ver CG Use large table square set wing mount square motor tube key gluing /16 x A-in balsa strips bottom wing across chord wing goes same position time cant shift dur ing flight will happen its left un keyed Key nose block assembly fuse lage bit A-in ply needed LANDER INDUST 1005 19TH ST CT HAYRE MONTANA 59601 4062656529 BUILDING BOARD 30x48 $4895 ncf 24 X 66. $6395 inc frI CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surface bonded 3/4 laminated warp tree base straight true work surface will last years years CHECK EM ALL OUT English Lcitlicr CALENOAR GIRL CNALLENGE 19 AUG AC MODELER NW 503 646-4531 PORTLAND OR 26 AUG JOES HOBBY CTR 313 933-6567 DETROIT Ml 9/22/23 CENTRAL PENN 717 564-3280 HARRISBURG PA $2500 STARHAWK FUN FLY NEW STARHAWK BIPLANE NEW MISS STARHAWK POSTER See Starhawk Dealer details write Thorpe Engineering Corporation 1715 E Fairfield Mesa AZ 85203 Poster $500 P&H Prepaid 182 Model Aviation Airtronics powerful 94141 Mian Servo strongest servo its size ever produced Compactly designed Ito provide max imum torque space restrictive RC applica tions precision ball bearing 94141 well suited types ahtraft Compatible Airtronics radio systems 94141 ideal use sailplane flaps ailerons formula pylon air craft electric R/C alitraft rued 94141 servo utilizes metal output gear coupled durable metal molded gear train Its reinfoned case features unique side mounting brackets allow easy horizontal servo place ment inside aircraft wings information about Airteunics quality pmducts please call write address above 94141 Specifications Part Number 94141 Description Precision High Torque Ball Bearing Micro Servo Dimensions L 137 36mm W 060ISmm H 127 325mm Weight118 oz 33 grins Torque 45 oz/in 32 kg/cm Transit Time 025 seconds 600 rocacion Equipped splined stand ard size servo arm 94141 features ball bearing supported output shaft high quality coreless motor advanced electronic componentry No cornparably sized lightweight servo matches superior strength high torque powerful performance Airtronics 94141 I\hcro Servo SetThe Standani jAIRTRONICS INC Autry Irvine CA 92718714 830-8769 wood screw stop Dont omit screw will tear out balsa stop against screw nose plug place its blades folded either side motor tube determine best placement in spruce key locks nose block against rotation Zona saw cut away inner nose block ring key slot motor tube match photo will clarify operation Its im portant have two key points distri bute shock shaft striking screw prop has lot kinetic en ergy keys take quite load Its also good idea double motor tube covering material around key slots hooks seen photos proSMALL RIC HOBBY DEALERS! WE ARE DISTRIBUTOR KEYED TO YOUR PARTICULAR NEEDS information write call Southern Hobby Distributors 256 Madison Blvd Madison TN 37115 615 868-2100 1030 AM 500 PM CST peller blades made soft wire such paper clip Note location hooks somewhat aft hinge line blades folded rubberband hook goes over front Z-bar back other hook Change rubberbands before contest two reasons First its very important blades fold way back against mo tor tube stay way otherwise glide trim will thrown off Second rubberbands deteriorate very rapidly sun drafting triangle again using trusty worktable square check propeller blades track identical angle blade Also check static hAYALOISSRSSEOESASS DOGS X&.DIMS CONrAIl FUSE SIZE RECORDS MOM 97005 FATNDHASEOASSAMLM SHOE SOOTHEASTERN NE 19399AETELEHAS BEER ABE BOMBER AESOARIXSPETENRE vED LAER ER balance like Z-bar shown aluminum hub FAI Model Supply could substituted Cut small rudder tab about /a x 1 /2 trailing edge fin glue back place approximately /I6 left deflection small carpenters square check front end motor tube downthrust right thrust angles should about l should weigh about eight ounces ready fly 90 grams about three ounces contributed motor Oil propeller bearings lube motor youre ready fly Flight testing trim adjustment U3- Corter Rubber Band Powered He1icoper Flying repeatibillity coniStflt remult Flyn FOISWAI5D 5 gacewans nanEns TUESS CAM EBSI Fly IN TESTES HAD NO FEaTURES hPOHrrSApplitd BatS & Paper CENS$PEHIiON Setailed liSp ISep NStFOciiSflS 555tH pSPtS mE-COTinILLEM ASM AirIranse irreStly Sn FULL SIZE PLANS IS ISMS EESy ESSeFAIS / 7/ \T HhSlD 9O PD September 1990 183 Small Wonder ZAP UNIVERSITY COLLEGE OF GLUE KNOWLEDGE RONS MODEL Radio Controiled BUILDINGAirplanes Other Aircraft Boats 213 451-0414 ii Build Ry model should climb right turn glide left Glide controlled stabilizer tilt thickness aft incidence block Climb adjusted after satisfac tory glide trim has established Adjust climb small changes thrust line Thrust adjusted gently filing end motor tube change angle nose block rests very small increments Dont fly full power until youre completely satisfied models trim Make sure model climbs right turn avoid tendency loop hang prop power stall youre ready fly full power launch model about 450 angle tends go its pointed have flown few Conscientious Objectors just didnt want turn left glide ri diculous amount tilt stabilizer simply let turn right glide well climb Still unless really know what youre doing left glide right climb safe way go Dethermalizer accompanying photo dethermalizer shows its layout quite clearly guide tube under SHOC sta bilizer mount has multiple functions con ducts DT line keeps stabilizer rub bers touching line serves DT limit stop piece monofilament line can used DT line loop end fitted over peg top sta bilizer rubber must installed over loop stay place rubber loops over peg extends across leading edge stabilizer goes down around fuselage back up peg bit fuel tubing serves nicely DT line limit can tied line simple overhand knot adjusted strike line guide tube under SHOC mount tubing should adjusted allow about 450 stabilizer DT angle Tied other end DT line paper clip wire hook fuse rubberband extends hook across fuse around motor peg Use sharpened piece aluminum tubing drill holes fuselage makes cleaner hole does drill Use A-in tube fuse holder extending through both sides fuselage way can poke fuse material through piece wire can also pull out bit fuse case delay between lighting launching Glue tube firmly place heat sink can made alumi num can must selected care Ive used Coors Light cans cant say whether another brand would work well will gladly try answer questions might have about Conscientious Ob jector Send SASE 1902 Peter Pan St Norman OK 73072 responding advertisers mention read about Model Aviation Convert/McKinley Continued page 82 charge rather three some plan ning use small battery packs can aim think 20- 30-sec motor runs climb rates equal glow- ignition-powered models little no weight penalty Rally/Homer Continued page 88 forget did didnt fly AMA Rally Scobie Field Nor will other Houston modelers Bomber Field Club planning major event October Sev eral B-17s air simultaneously would something behold AMA Frequency Committee member George Steiner traveled Sacra mento CA teamed Bob Spivey Aus tin TX handle transmitter impound chores Charlie Marilyn Stevens Vance Dottie Wyman coordinated host local volunteers assist planning running event course rally would have possible efforts AMA HAMCI staff volunteers AMA Presi dent Don Lowe District VIH Vice Presi dent Gene Hempel AMA Executive Di rector Vince Mankowski hand Continued page 188 184 Model Aviation Caii Write 435 San Vicente Bivd J Santa Monica CA 90402 turn yoor printer lot oil plotter with.. FOILED AGAIN! C PLOT AIRFOILS IN ANY CIIORD u 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR 5HEETED WINGS ENTER DATA EASILY VIA INTELUGENT EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES 18-PAGE ILLUSTRATED U5ER MANUAL $45oo a cram prom slain ~2Z4i IiwflaihOO COopuV ira dot INI Clv conwaS potfli tWo w* irding ipioty 550 o 30 dOic Sm ram urocoy ordi CYGNET Software714 4966961 24843 Del Prado #141B Dana Point CA 92629 CAPACITIVE-DISCHARGE IGNITION SEA5 AMAN No moving parts No eng ne mod oat ons Basic unit $ 9995 Opposedcylinder twin $ 11995 ELECTRONIC CIRCUITRY REPLACES ANY MECHANICAL ADVANCE MAKES MAGNETO CONVERSIONS SNAPII
Edition: Model Aviation - 1990/09
Page Numbers: 74, 75, 76, 77, 180, 181, 182, 183, 184
Conscientious Objector Looking model can stand up rough-andtumble AMA Cate gory II Ill competitionand win robust rubber-powered Mul vihill good bet EBill Baker MOST MULVIHILL DESIGNS have published seem intended Category competition five-minute maxes judge relatively large fragile struc tures designed succeed events flown under AMA Category II III rules knew contests Id flying would involve windy weather small rough fields time Category II III rules would hold three- twominute flight times first three flights Conscientious Objector somewhat smaller typical Mulvihill design its also much less fragile model ca pable five minutes early morning air wont much good wing folds first windy flight gets beat shreds push five maxes just reach requirement five-minute max model competitive Id hoped will three minutes easily tactic fly early getting first three four flights before wind downdrafts strengthen try pick up some lift four- five-minute maxes Most competition will elim inated thensometimes can look back half-century model building Ive enjoyed being involved nearly facet hobby Ive flown CL RC mostly sport flier course have flown practically type Free Flight model known Most competition flying has Free Flight concentrating Gas events dropped out Free Flight about 1964 flew RC until 1976 Around time old Free Flight urge crept up again attended contest see what changed decided would fun learn new event like Rubber rather falling back old Gas groove happened long before Bob Dunham published Draft Dodger April 1975 issue Flying Models Id long awe Dunhams great-flying Rubber models Draft Dodger im mediately claimed interest Mass-produced Draft Dodger parts tum bled out workshop like Henry Ford cars point early process counted three wings five fuselages four stabs four props just keep two mod els flying competition surprise novice Rubber flier time models flew very well win ning contests 1979 started making few changes important rolled balsa tube fuselage did nothing im prove performance fuselage much less prone damage also rede signed wing mount modifications added up very practical Category Ill w model dubbed Conscientious Objec tor because wasnt exactly Draft Dodger anymore took both stock Draft Dodger newly evolved Conscientious Objector 1979 Nationals CO very high pitch prop giving longer slower climb contrast explosive power burst generated low-pitch prop Draft Dodger Wind conditions very strong blowing right across ocean corn two planes allowed event strat egy fly Draft Dodger first four flights knowing within three min utes would either corn OOS out-of-sight would likely lost fourth flight held Conscien tious Objector reserve fifthand hoped winningflight strategy worked though 74 Model Aviation Above The author showing off Conscientious Objector wheatfield near Norman OK No oil well background Isnt Bills probably wouldnt object owner bequeathed him Below authors iong-sufferlng hungry wife Paula holding up model show its lines promise lunch soon ordeal over Draft Dodger damaged after flight mostly wing mount damage diagonals broken out its explosive climb rate model flew through ground turbulence slower climbing Conscientious Ob jector wouldnt have able cope Still using tubular fuselage contin ued adapt Conscientious Objector un til virtually no remaining parts identi cal Draft Dodger guess difference between plagiarism research sources borrow adapted prop published years ago Frank Parmenter borrowed stabilizer structure Bob Whites Twin Fin also used simple Z-bar-type propeller hub copied wing mount few other ideas Jim OReilly invented better winding hook worked out sim ple reliable dethermalizer setup probably owes something lot differ ent people tried longer motor tubes va riety wings some area dif ferent dihedral schemes others differ ent airfoils experimented sev eral propellers model presented represents what judgment best compromise achieving key objective Mulvihill thats competitive Category III might want increase wing area 300 sq motor tube 42 model will serve flyoff five minute rounds Category may also want increase propeller diameter half-inch 95% Mulvihill flying done US model pre sented very competitive After 1979 AMA Nationals win Draft Dodger flew two Na tionals under Category III rules placed both third fifth time Conscientious Objector failed place Nats event surprise flown under Category rules As time went interests shifted Old-Timer events began attending SAM Champs instead AMA Nats Nevertheless continued well Conscientious Objector local re gional contests until found myself unable meet physical demands Free Flight competition present Im enjoying RC Sailplanes Conscientious Objector has permanent niche affections Id like think somewhere someone will flying Category III Mulvihill winning Construction motor tube fuselage houses mo tor also holds other parts air plane proper relationship another Though several fuselages built square cross section found tube config uration has best strength-to-weight ratio Use A6 x 4-in-wide 6- 8-lb A-grain balsa Make sure wood uniform density grain through entire length piece its much harder edge other transitions C-grain dont use Using metal straightedge trim sides true Seal wood side two coats Deft semigloss clear dope Sand gently between coats dry wet entire piece water will cause curl unpainted side expands Form wet balsa around 1 A-in-dia dowel after first scoring line down center dowel align balsa Largediameter dowels can procured hardware store lumber supply company believe theyre intended clothes closet hanging rods Jim OReilly once suggested using fluorescent tubes form motor tube Fearing would fall off ladder dur ing construction opted wood dowel Its also easier carve tail cone wood Ever try carving fluorescent tubing Wrap wood gently strips cloth gauze Ace bandage let dry Remove wood dowel apply Titebond along edges draw together Secure bits masking tape allow dry Make one-inch-wide nose doubler tail doubler about 1 wide simi larly prepared balsa doublers will Left Looking underside wing mount can see two lengths oil/a x 1A-in balsa used key wing pylon mount piece glued side wing pieces also serve fill gap between top pylon bottom undercambered wing Right Construction details wing mounting pylon side rails I/ x % spruce An easy way shape base pylon wrap sandpaper around motor tube sand pylon base perfect before final installation September 1990 75 Close-up view simple effective reliable dethermalizing mechanism motor peg tube fuse tube aluminum drink can heat sink can seen fuselage forward fin Small pieces %-in aluminum tubing serve guides limit line slip inside tube Glue place Titebond similar product sure let aft doubler protrude tube about youll have something glue tail onto tapered end forming dowel plane rasp easily form tail cone amount taper isnt crit ical 1 /4 narrowing 34 about right Make circular former hard -in balsa two cross-grained /16 pieces Fit former inside aft doubler end motor tube will prevent damage tapered cone should motor break Place another -in former area SHOC mount multifunction stabilizer mount attributed Sky Hoppers ange County California Dont worry rolled tube isnt per fectly circular Lay table allow roll until stops Let flat spot side top bottom 900 discernible curvature tube let concave side bottom joining tail cone eyeball closely can isnt perfect cone mount top forms straightest line motor tube motor pin must strong since tre mendous force exerted upon pin must course removable order change motors Use least A-in pin 1/2 SOFT BALSA WING TIP 9 SECTION DIHEDRAL BREAK RAISE T P 4 1/4 1 22I ZV LLI Ii 1/16 BAlSA SHEET 00155 DIGS 3/32OSIIRI S I/IA WIRESLIM ThBE RINK HOLE THIS LINE PARALLE 1/32PLYTO ESSE OF BLOCK PROP ERN n OCT COTTOM CC TOO TO MANO MRPOL SDOPE FRORT THIN TOrISOL CORNER TOIC4 TDICN AT HOC COIRT S THIRDSTOOL PROP BLADE CROSS SECTIONS NOT TO SCALE 3/32OIA3/5 015 HOLE HOLES /5 ALJMPJJM WINDING HOOK NOTE 3/64 TO 116 DOWN THRUST FOSELASE IS TJBE MADE BALSA SHEE 76 Model Aviation proplhub/nose block mechanism offset slot motor tube clearly seen offset makes impossible mount nose block upside down plastic press-on wheel collars attach blade Z-bar must leading edge theyll thrown off along blades creating lot noise very little thrust crashed airplane Another view prop/hub/nose block assembly showing doubled blade hinge assembly Zbar spring bearing motor hook Complete instructions carving blades nose block fashioning hub mechanism included text clearly detailed plan Finished aluminum hubs function just well can purchased through FAI Model Supply Wing jigs important especially mass-producing wings jig building wing shown plan background foreground jig polyhedral variant prop/hub/nose block assembly attached motor tube Note blades fold flush against tube its important fold way back against shown stay way during glide Otherwise glide trim will thrown off Full-Size Plans Available. See Page 196 I/IA I/A HALSA WEBS 1/B BALSA SPAR NO DIHEDRAL BREAK AT CENTER LINE WIN~ PlAN I4 SO BALSA LEADING EDGE DIHEDRAL BREAK RAISE WING TIP 4-1/4 imi~ _[-t___ OUBL TOP 0 3 -- F AR BALSA 29 OF UK BALSA GA HESHEAR WEE AT DIHEDRAL JO/AT LEL I/H HARD BALSA_ IM OP I/3D LEDIHEDRAL WING RIB PATTERN BRACEAIRFOIL IS DUNHAM-BARER- REEHOK 00KGOLDBERG PASTIC IDE OFZ AGR AS THE WHEEL OLLAR FAI MODEL SUPPLY RGLL TEREARING AND SPRINO 3D PLO NCE WREI/IA ID TUBE GAVB SPRUCE KES HEW WITH EMOVED NOSE/PROP DETAILI/IA BALSA SHEET S/A UPRJCE I/RBALSATF-I B F-B SHEET___________ F-234 aUNT WINS INCIDENCE 0 ICALE Ir\IIilIIIIITi~ F-I FOED CUFHF5 I/B 3/IA SPRCE RAILS / FUSELAGE SIDE VIEW I/H GO BALSA DOG BLER I/A BALSA SHEET GUSSETS /H SG RGLSA LE I/H SO EALSA DOUBLER I/A RALSA4 \JL/ N SHEET TP END IEW I/H BALSA SHEET RIBS AT DIHEDRAL BREAK 1/ H PLY I/IA BALSA VIA BALSA SHEET/64 PLO I/3D HALSA SHEET SHEAR WEBS STAB STAB DIAGONAL I/IA BA3A SHEET PROP BEARING DETAIL NO SCALE TWO I/H HALSA SHEETS CROSS URANED ALUM SODA CAN HEAT SINE BOTH I/A DIASIDES MOTOR PIN NOTE COMPLETE MODEL RTF WITH MOTOR THEN GLUE WING MOANT ON WITH ARKED ON WING MOUNT OVER ACTUAL C S I/B I/IA BALSA SPARS TOP AND BOTTOM STABILIZER VIE BALSA RIBS /8 50 BASA- TRANS EDGE I/IA HASA DI AS ON ALS I/H BALSA SHEET 1/4 BALSA INCIDENCE BLOCK-TRIM FOR RUDGER TAB -DD TO -3 INCID I/A EFT I/lA PLY SHOC MOUNT 1/H ALUM TUBE CRIMP ALUM TUBE 1/4 BALSA I/H BALSA I/ADD ALUM TUBE THRA FUSELAGE /16 BALSA SHEET DOURLER PAPER CLIPCRIMP ALUMTRACING BY OE DEMARCO HOOKTUBE MODEL ATION CONSCIENTIOUS OBJECTOR DESIGNED BY BILL BAKER reinforce tube holes made fin can made %-in light sheet balsa save weight cant find four- six-pound sheet built-up fin could used course would prone battle damage install fin lay tube its side flat table Block up fin books pieces wood its centered tube parallel table glue place As long fin parallel direction flight symmetry tail cone critical Ron Robertti once told tail aint straight retorted thing needs turn anyway Covering fuselage cover tubes tissue sometimes silk Ive also used polyester cloth intended dress making Its very tough comes pretty colors wrinkles can elimi nated through heat shrinking down side its little heavier other materi als next tube Id like try O6-oz fiberglass cloth clear dope adhe sive dont usually cover tail cones fins would use tissue did un covered areas including prop usu ally finished Deft semigloss wood filler/sealer available hardware store stabilizer quite conventional Its also lightweight trouble-free Note both leading trailing edges made A-in-sq stock Round off leading edge put slight taper trailing edge Beauty second ary lightweight warp-free construc tion model flying speeds slow wide sharply tapered trailing edge would simply excess weight Hence truncated trailing edges used both stabilizer wing Note point needed con nect both DT dethermalizer limit line front stab hold-down rubber Also note absence need sheet fill September 1990 77 Continued page 180 Three Mulvihill standouts author Bill Baker left George Perryman center Jim OReilly placed first second third both 1979 1982 AMA Nats ALL STAINLESS STEEL HEAD LITE IItm BEST GLOW PLUG CONNECTOR Stainless Steel HEAD LOCK BEST DESIGNAll Welded No Solder Acid Flux Flexing Wires BEST NiCadField Replaceable 12 AH SANYO 15 AH PANASONIC BEST QUALITY & GUARANTEE MODEL PRODUCTS CORPORATION BEST PRICESt #045-WIO NiCad Charger$ 995 available write directSt #040-With NiCad$ 1595 add $100 $200 outside US St #041-With NiCad & Charger $ 2595 MODEL PRODUCTS CORP RO Box 100 Allamuchy NJ 07820201850-1508 have coloring model planes using method years Unlike Floquil butyrate-jar skimming inexpensive food markets fabric outlets sell Rit dyethe powdered kind comes infinite variety colors can used straight blended just right color use baby food jars mixing Open pouch Rh dye pour few beads jar pour some dope thinner acetone top will surprised quickly thin ner snatches color dye Keep blending using raw balsa sticks test against color sam ple want match Once satisfied add about 20% clear dope mix always put couple thin coats clear dope model first prevent creeping Rit will give lively-looking color saving little jar will allow patching later Just add thinnerthere no pigment Work takes longer tell about FF Scale/Warner Continued page 73 Investigation problem turned up fact Federal Standard screwed up 1964 changed color standard original WW II olive drab new kept old number F534087 confuse modelers restorers make things worse Uncle Sam gave same number very dark brown olive drab March 1979 meant modelers three FS34087s choose January 1984 34087 reappeared original shade gloss semigloss versions OD dark brown version 1979 14087 24087 June 1984 GSA decided straight en things out issued change notice ef fect color chip 34087 dated March 1979 wrong color shall used colors 14087 24087 34087 represent two different colors lors have re numbered follows 14087 now 14084 24087 now 24084 34087 now 34088 makes five matte olive drabs pre-1964 34087 post-1964 34087 March 1979 34087 wrong color 1984 34087 1984 Change Notice 34088 same color later 34087 new FS595B being printed riht now should take care confusion right Dont count Don suggests build Navy aircraft forget about olive drab alto gether case its nice see company concerned about getting right Perhaps thats cause Don perfectionist kind person would balance wheel wheelbarrow Czech submarine contest high points life getting news what other modelers doing Id like share Lubomir Koutnys account contest Czechoslovakia likes drought-ridden Califor nians long Boys Zabreh north Moravia began arrange A0-scale contest little town did very well am sorry weather perfect submarine contest rain damp air very well Scale big perfect varnish like Straniks twin Batman won Other boys give Scales over hot car engine before next flight get idea guess spoiled re member flying guys southern France flew rain shine often packed model boxes cars after sunset Plastic vs rubber have hearing nasty rumors late rubber stored plastic con tainers may deteriorating accelerated rate might due outgassing plastic container have rubber stored type container length time under optimal conditions airtight out heat might want check out let know harm seems have done Im sure other readers would really happy know whether good way store precious rubber motors Well until next time guys gals always re member Dont dope models sandstorms things wont too rough Conscientious/Baker Continued page 77 stab lightweight aligns itseli small notch DT line tht trailing edge action SHOC-typt stab front mount centers leading edgc well enough negating need keying An added advantage system thaI its free move meeting obstruc Man turer Hi Performa utba$Is andraft CULPEPPER C MODELS INC 2526 Washington DubuqmIA 520411 31015834830 180 Model Aviation PRODUCTS FOR THE O4SCERNING MODELER FF Duration/Linstrum Continued page 71 Made America American Technology RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Fot-ster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Coil wrte free information RJL Industries PO Box 5 Sierra Mack-e CA 91025 818 359-0016 Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanshin & Perfomance Serious Horsepower3 0S ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shade Performance Specialties Send $1 00for fully illustrated catalog Available VS Long & Short Stroke 06 Long Stroke 06 6IFSR 06 40 VRP/VF 06 91 VRDF STX-40 Rossi 40 coming soon mare information Call 619 729-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 tion would break keyed stabilizer notched peg holds rubber DT line can made A6 ply popsi cle stick tongue blade wood dowel aluminum tubing peg mounting platform stabilizer should also /~ ply peg must able withstand certain amount strain Wing heavy-duty spar shown plans Ive never broken wing Maybe spar too heavy like up per main spar can made either very hard balsa spruce other spars can medium 8-10-lb balsa shear webbing between spars very important Installing pieces along centers spars shown plan ideal find making full depth locating along side easier adequate -in hard balsa angled center dihedral brace can also made full depth Shim up rib fronts A2 above leading edge small taper cut can made will shape leading edge conform undercambered ribs Shim up rear end ribs trailing edge A2 same reason wing can built jig youre going build several wings jig highly recommended jig used airplane allowed wing built piece except lower spar added air later use jigs dates discovery warps plagued induced during process adding dihedral dont usually shim washout since about washout seems occur auto matically tissue doped wing mount motor tube de signed lightweight rigid platform wing rest quick way achieve perfect fit wrap piece sandpaper around tube lightly sand mount base shape Dont glue wing mount fuselage until model ready fly must adjusted achieve correct CG center-of-gravity After mount glued place make sure theres enough stabilizer tilt produce left turn Propeller may try write detailed arti cle propeller carving soon sub ject has covered thoroughly else Wood selection primary impor tance block should hard about 14 lb uniform density produce blades both thin strong Lay out top bottom profiles making sure centerline top profile parallel edge block same bottom line side profile Set block drill press drill hole hinge Cut out profiles band saw Carve bottom blades first com pletely finishing before starting top sure keep track right left blades once carved six left-handed blades before realized what doing Thank fully wife saved day suggesting carve six right-handed blades Try about /16 undercamber midblade progressing no undercamber tip Begin carving top blade get ting down about A-in thickness Make high point airfoil its helpful mark about one-third chord Take time Carve thin slices chunks Shape blade aft high point sort triangular profile start final shaping leading one-third high point thickest part blade should about /16 tip midblade Add A4 A2 ply doublers /32 OD tubing hinge Place blade Z-bar hub drill holes limiting pins A6 drill mounted pin vice Take extreme care drilling holes blades track properly sight turning blades pro file should perfect alignment other Finish propeller Deft equivalent cant find Deft local hardware store Ive noticed listed Lee Campbells catalog nose plug made A-in sheet balsa laminated cross-grained first lam mate fits inside motor tube sec Electric Flight f Controller Perfect 05 Motors 510 cells 2mooth Has Brake Lightweight 12 Adjastobte switching pointssoney hock Soldertess tenssisot ror easy hookup guarantee ON/OFF Controller $2495 Power save weight very high efficiency ossty O06V loss 77 22x13x63 Colifoneejo residents add 65% $163 Tax Add $100 foe shipping Send Check money order wessaitiHigh Sky Futaha cossoetoc Kansas St #9 othn availableSan DiegoCA 92104 23rd consecutive year covering continues go easier & last longer rest Congratulations Super Coverite September 1990 181 JET bust completely finished authentically detailed poseable 1/8 scale Al QC1Ir pruu209 2244170 II p0 box 5631fresno Ca 93755 II ond should conform outside shape tube brass aluminum tube can inserted plug smaller pieces tubing approximately 1/8 long inserted end form bearings wire prop shaft Use Loc-Tite similar product adhere inner pieces tubing outer tube Use CyA cyanoacrylate glue install completed bearing nose block Add plywood face least large external ball bearing wont crush balsa Use good spring such available through FAI Model Sup ply Dont use ball-point pen spring other cheap alternative might take set Make Z-bar out A6 music wire Use Sta-Brite equivalent hard solder Never trust soft solder hold propeller hub together First balance Z-bar alone attach blades balance again used make batch blades pairmatch according weight simi larity As recall averaged eight 10 grams try dont get confused about right- left-handed blades did winding hook shown plan works quite well rubber will stay cen tered unless Newton wrong dont understand winding hooks winding tubes stooges other aspects rubberpowered model technology buy Don Ross book Rubber Powered Model Airplanes AMA Supply Service catalog motor made up enough 34-in strands weigh 85 90 grams dry Consis tency whats wanted should no slack used size motor Mulvi hills nearly Old-Timer Rub ber models such Lanzo Stick Korda Dethermalizer may able everything thing did learn wind motor consistently Trying get used different motors dif ferent models can very stressful con test time Life John Wayne says movie Iwo Jima tough its tougher youre stupid Keep simple Choose motor get used Youll make fewer stupid mistakes under pressure competition Trimming balancing center-ofgravity shown plan best allaround thermal windy weather flying flying early morning still air CG could moved slightly aft decalage reduced model designed stability reliability rather absolute max imum performance Set SHOC stabilizer mount about /l6 tail cone making careful cuts Zona saw removing wood tween cuts create flat spot sup port mount should tilt slightly right making left tip about er right wing mount should have no inci dence relative motor tube deca lage established angle stabi lizer sitting aft block under its trail ing edge angle should two three degrees about / higher trailing edge Glue wing mount place mo tor loaded making sure balancing mark 6ver CG Use large table square set wing mount square motor tube key gluing /16 x A-in balsa strips bottom wing across chord wing goes same position time cant shift dur ing flight will happen its left un keyed Key nose block assembly fuse lage bit A-in ply needed LANDER INDUST 1005 19TH ST CT HAYRE MONTANA 59601 4062656529 BUILDING BOARD 30x48 $4895 ncf 24 X 66. $6395 inc frI CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surface bonded 3/4 laminated warp tree base straight true work surface will last years years CHECK EM ALL OUT English Lcitlicr CALENOAR GIRL CNALLENGE 19 AUG AC MODELER NW 503 646-4531 PORTLAND OR 26 AUG JOES HOBBY CTR 313 933-6567 DETROIT Ml 9/22/23 CENTRAL PENN 717 564-3280 HARRISBURG PA $2500 STARHAWK FUN FLY NEW STARHAWK BIPLANE NEW MISS STARHAWK POSTER See Starhawk Dealer details write Thorpe Engineering Corporation 1715 E Fairfield Mesa AZ 85203 Poster $500 P&H Prepaid 182 Model Aviation Airtronics powerful 94141 Mian Servo strongest servo its size ever produced Compactly designed Ito provide max imum torque space restrictive RC applica tions precision ball bearing 94141 well suited types ahtraft Compatible Airtronics radio systems 94141 ideal use sailplane flaps ailerons formula pylon air craft electric R/C alitraft rued 94141 servo utilizes metal output gear coupled durable metal molded gear train Its reinfoned case features unique side mounting brackets allow easy horizontal servo place ment inside aircraft wings information about Airteunics quality pmducts please call write address above 94141 Specifications Part Number 94141 Description Precision High Torque Ball Bearing Micro Servo Dimensions L 137 36mm W 060ISmm H 127 325mm Weight118 oz 33 grins Torque 45 oz/in 32 kg/cm Transit Time 025 seconds 600 rocacion Equipped splined stand ard size servo arm 94141 features ball bearing supported output shaft high quality coreless motor advanced electronic componentry No cornparably sized lightweight servo matches superior strength high torque powerful performance Airtronics 94141 I\hcro Servo SetThe Standani jAIRTRONICS INC Autry Irvine CA 92718714 830-8769 wood screw stop Dont omit screw will tear out balsa stop against screw nose plug place its blades folded either side motor tube determine best placement in spruce key locks nose block against rotation Zona saw cut away inner nose block ring key slot motor tube match photo will clarify operation Its im portant have two key points distri bute shock shaft striking screw prop has lot kinetic en ergy keys take quite load Its also good idea double motor tube covering material around key slots hooks seen photos proSMALL RIC HOBBY DEALERS! WE ARE DISTRIBUTOR KEYED TO YOUR PARTICULAR NEEDS information write call Southern Hobby Distributors 256 Madison Blvd Madison TN 37115 615 868-2100 1030 AM 500 PM CST peller blades made soft wire such paper clip Note location hooks somewhat aft hinge line blades folded rubberband hook goes over front Z-bar back other hook Change rubberbands before contest two reasons First its very important blades fold way back against mo tor tube stay way otherwise glide trim will thrown off Second rubberbands deteriorate very rapidly sun drafting triangle again using trusty worktable square check propeller blades track identical angle blade Also check static hAYALOISSRSSEOESASS DOGS X&.DIMS CONrAIl FUSE SIZE RECORDS MOM 97005 FATNDHASEOASSAMLM SHOE SOOTHEASTERN NE 19399AETELEHAS BEER ABE BOMBER AESOARIXSPETENRE vED LAER ER balance like Z-bar shown aluminum hub FAI Model Supply could substituted Cut small rudder tab about /a x 1 /2 trailing edge fin glue back place approximately /I6 left deflection small carpenters square check front end motor tube downthrust right thrust angles should about l should weigh about eight ounces ready fly 90 grams about three ounces contributed motor Oil propeller bearings lube motor youre ready fly Flight testing trim adjustment U3- Corter Rubber Band Powered He1icoper Flying repeatibillity coniStflt remult Flyn FOISWAI5D 5 gacewans nanEns TUESS CAM EBSI Fly IN TESTES HAD NO FEaTURES hPOHrrSApplitd BatS & Paper CENS$PEHIiON Setailed liSp ISep NStFOciiSflS 555tH pSPtS mE-COTinILLEM ASM AirIranse irreStly Sn FULL SIZE PLANS IS ISMS EESy ESSeFAIS / 7/ \T HhSlD 9O PD September 1990 183 Small Wonder ZAP UNIVERSITY COLLEGE OF GLUE KNOWLEDGE RONS MODEL Radio Controiled BUILDINGAirplanes Other Aircraft Boats 213 451-0414 ii Build Ry model should climb right turn glide left Glide controlled stabilizer tilt thickness aft incidence block Climb adjusted after satisfac tory glide trim has established Adjust climb small changes thrust line Thrust adjusted gently filing end motor tube change angle nose block rests very small increments Dont fly full power until youre completely satisfied models trim Make sure model climbs right turn avoid tendency loop hang prop power stall youre ready fly full power launch model about 450 angle tends go its pointed have flown few Conscientious Objectors just didnt want turn left glide ri diculous amount tilt stabilizer simply let turn right glide well climb Still unless really know what youre doing left glide right climb safe way go Dethermalizer accompanying photo dethermalizer shows its layout quite clearly guide tube under SHOC sta bilizer mount has multiple functions con ducts DT line keeps stabilizer rub bers touching line serves DT limit stop piece monofilament line can used DT line loop end fitted over peg top sta bilizer rubber must installed over loop stay place rubber loops over peg extends across leading edge stabilizer goes down around fuselage back up peg bit fuel tubing serves nicely DT line limit can tied line simple overhand knot adjusted strike line guide tube under SHOC mount tubing should adjusted allow about 450 stabilizer DT angle Tied other end DT line paper clip wire hook fuse rubberband extends hook across fuse around motor peg Use sharpened piece aluminum tubing drill holes fuselage makes cleaner hole does drill Use A-in tube fuse holder extending through both sides fuselage way can poke fuse material through piece wire can also pull out bit fuse case delay between lighting launching Glue tube firmly place heat sink can made alumi num can must selected care Ive used Coors Light cans cant say whether another brand would work well will gladly try answer questions might have about Conscientious Ob jector Send SASE 1902 Peter Pan St Norman OK 73072 responding advertisers mention read about Model Aviation Convert/McKinley Continued page 82 charge rather three some plan ning use small battery packs can aim think 20- 30-sec motor runs climb rates equal glow- ignition-powered models little no weight penalty Rally/Homer Continued page 88 forget did didnt fly AMA Rally Scobie Field Nor will other Houston modelers Bomber Field Club planning major event October Sev eral B-17s air simultaneously would something behold AMA Frequency Committee member George Steiner traveled Sacra mento CA teamed Bob Spivey Aus tin TX handle transmitter impound chores Charlie Marilyn Stevens Vance Dottie Wyman coordinated host local volunteers assist planning running event course rally would have possible efforts AMA HAMCI staff volunteers AMA Presi dent Don Lowe District VIH Vice Presi dent Gene Hempel AMA Executive Di rector Vince Mankowski hand Continued page 188 184 Model Aviation Caii Write 435 San Vicente Bivd J Santa Monica CA 90402 turn yoor printer lot oil plotter with.. FOILED AGAIN! C PLOT AIRFOILS IN ANY CIIORD u 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR 5HEETED WINGS ENTER DATA EASILY VIA INTELUGENT EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES 18-PAGE ILLUSTRATED U5ER MANUAL $45oo a cram prom slain ~2Z4i IiwflaihOO COopuV ira dot INI Clv conwaS potfli tWo w* irding ipioty 550 o 30 dOic Sm ram urocoy ordi CYGNET Software714 4966961 24843 Del Prado #141B Dana Point CA 92629 CAPACITIVE-DISCHARGE IGNITION SEA5 AMAN No moving parts No eng ne mod oat ons Basic unit $ 9995 Opposedcylinder twin $ 11995 ELECTRONIC CIRCUITRY REPLACES ANY MECHANICAL ADVANCE MAKES MAGNETO CONVERSIONS SNAPII
Edition: Model Aviation - 1990/09
Page Numbers: 74, 75, 76, 77, 180, 181, 182, 183, 184
Conscientious Objector Looking model can stand up rough-andtumble AMA Cate gory II Ill competitionand win robust rubber-powered Mul vihill good bet EBill Baker MOST MULVIHILL DESIGNS have published seem intended Category competition five-minute maxes judge relatively large fragile struc tures designed succeed events flown under AMA Category II III rules knew contests Id flying would involve windy weather small rough fields time Category II III rules would hold three- twominute flight times first three flights Conscientious Objector somewhat smaller typical Mulvihill design its also much less fragile model ca pable five minutes early morning air wont much good wing folds first windy flight gets beat shreds push five maxes just reach requirement five-minute max model competitive Id hoped will three minutes easily tactic fly early getting first three four flights before wind downdrafts strengthen try pick up some lift four- five-minute maxes Most competition will elim inated thensometimes can look back half-century model building Ive enjoyed being involved nearly facet hobby Ive flown CL RC mostly sport flier course have flown practically type Free Flight model known Most competition flying has Free Flight concentrating Gas events dropped out Free Flight about 1964 flew RC until 1976 Around time old Free Flight urge crept up again attended contest see what changed decided would fun learn new event like Rubber rather falling back old Gas groove happened long before Bob Dunham published Draft Dodger April 1975 issue Flying Models Id long awe Dunhams great-flying Rubber models Draft Dodger im mediately claimed interest Mass-produced Draft Dodger parts tum bled out workshop like Henry Ford cars point early process counted three wings five fuselages four stabs four props just keep two mod els flying competition surprise novice Rubber flier time models flew very well win ning contests 1979 started making few changes important rolled balsa tube fuselage did nothing im prove performance fuselage much less prone damage also rede signed wing mount modifications added up very practical Category Ill w model dubbed Conscientious Objec tor because wasnt exactly Draft Dodger anymore took both stock Draft Dodger newly evolved Conscientious Objector 1979 Nationals CO very high pitch prop giving longer slower climb contrast explosive power burst generated low-pitch prop Draft Dodger Wind conditions very strong blowing right across ocean corn two planes allowed event strat egy fly Draft Dodger first four flights knowing within three min utes would either corn OOS out-of-sight would likely lost fourth flight held Conscien tious Objector reserve fifthand hoped winningflight strategy worked though 74 Model Aviation Above The author showing off Conscientious Objector wheatfield near Norman OK No oil well background Isnt Bills probably wouldnt object owner bequeathed him Below authors iong-sufferlng hungry wife Paula holding up model show its lines promise lunch soon ordeal over Draft Dodger damaged after flight mostly wing mount damage diagonals broken out its explosive climb rate model flew through ground turbulence slower climbing Conscientious Ob jector wouldnt have able cope Still using tubular fuselage contin ued adapt Conscientious Objector un til virtually no remaining parts identi cal Draft Dodger guess difference between plagiarism research sources borrow adapted prop published years ago Frank Parmenter borrowed stabilizer structure Bob Whites Twin Fin also used simple Z-bar-type propeller hub copied wing mount few other ideas Jim OReilly invented better winding hook worked out sim ple reliable dethermalizer setup probably owes something lot differ ent people tried longer motor tubes va riety wings some area dif ferent dihedral schemes others differ ent airfoils experimented sev eral propellers model presented represents what judgment best compromise achieving key objective Mulvihill thats competitive Category III might want increase wing area 300 sq motor tube 42 model will serve flyoff five minute rounds Category may also want increase propeller diameter half-inch 95% Mulvihill flying done US model pre sented very competitive After 1979 AMA Nationals win Draft Dodger flew two Na tionals under Category III rules placed both third fifth time Conscientious Objector failed place Nats event surprise flown under Category rules As time went interests shifted Old-Timer events began attending SAM Champs instead AMA Nats Nevertheless continued well Conscientious Objector local re gional contests until found myself unable meet physical demands Free Flight competition present Im enjoying RC Sailplanes Conscientious Objector has permanent niche affections Id like think somewhere someone will flying Category III Mulvihill winning Construction motor tube fuselage houses mo tor also holds other parts air plane proper relationship another Though several fuselages built square cross section found tube config uration has best strength-to-weight ratio Use A6 x 4-in-wide 6- 8-lb A-grain balsa Make sure wood uniform density grain through entire length piece its much harder edge other transitions C-grain dont use Using metal straightedge trim sides true Seal wood side two coats Deft semigloss clear dope Sand gently between coats dry wet entire piece water will cause curl unpainted side expands Form wet balsa around 1 A-in-dia dowel after first scoring line down center dowel align balsa Largediameter dowels can procured hardware store lumber supply company believe theyre intended clothes closet hanging rods Jim OReilly once suggested using fluorescent tubes form motor tube Fearing would fall off ladder dur ing construction opted wood dowel Its also easier carve tail cone wood Ever try carving fluorescent tubing Wrap wood gently strips cloth gauze Ace bandage let dry Remove wood dowel apply Titebond along edges draw together Secure bits masking tape allow dry Make one-inch-wide nose doubler tail doubler about 1 wide simi larly prepared balsa doublers will Left Looking underside wing mount can see two lengths oil/a x 1A-in balsa used key wing pylon mount piece glued side wing pieces also serve fill gap between top pylon bottom undercambered wing Right Construction details wing mounting pylon side rails I/ x % spruce An easy way shape base pylon wrap sandpaper around motor tube sand pylon base perfect before final installation September 1990 75 Close-up view simple effective reliable dethermalizing mechanism motor peg tube fuse tube aluminum drink can heat sink can seen fuselage forward fin Small pieces %-in aluminum tubing serve guides limit line slip inside tube Glue place Titebond similar product sure let aft doubler protrude tube about youll have something glue tail onto tapered end forming dowel plane rasp easily form tail cone amount taper isnt crit ical 1 /4 narrowing 34 about right Make circular former hard -in balsa two cross-grained /16 pieces Fit former inside aft doubler end motor tube will prevent damage tapered cone should motor break Place another -in former area SHOC mount multifunction stabilizer mount attributed Sky Hoppers ange County California Dont worry rolled tube isnt per fectly circular Lay table allow roll until stops Let flat spot side top bottom 900 discernible curvature tube let concave side bottom joining tail cone eyeball closely can isnt perfect cone mount top forms straightest line motor tube motor pin must strong since tre mendous force exerted upon pin must course removable order change motors Use least A-in pin 1/2 SOFT BALSA WING TIP 9 SECTION DIHEDRAL BREAK RAISE T P 4 1/4 1 22I ZV LLI Ii 1/16 BAlSA SHEET 00155 DIGS 3/32OSIIRI S I/IA WIRESLIM ThBE RINK HOLE THIS LINE PARALLE 1/32PLYTO ESSE OF BLOCK PROP ERN n OCT COTTOM CC TOO TO MANO MRPOL SDOPE FRORT THIN TOrISOL CORNER TOIC4 TDICN AT HOC COIRT S THIRDSTOOL PROP BLADE CROSS SECTIONS NOT TO SCALE 3/32OIA3/5 015 HOLE HOLES /5 ALJMPJJM WINDING HOOK NOTE 3/64 TO 116 DOWN THRUST FOSELASE IS TJBE MADE BALSA SHEE 76 Model Aviation proplhub/nose block mechanism offset slot motor tube clearly seen offset makes impossible mount nose block upside down plastic press-on wheel collars attach blade Z-bar must leading edge theyll thrown off along blades creating lot noise very little thrust crashed airplane Another view prop/hub/nose block assembly showing doubled blade hinge assembly Zbar spring bearing motor hook Complete instructions carving blades nose block fashioning hub mechanism included text clearly detailed plan Finished aluminum hubs function just well can purchased through FAI Model Supply Wing jigs important especially mass-producing wings jig building wing shown plan background foreground jig polyhedral variant prop/hub/nose block assembly attached motor tube Note blades fold flush against tube its important fold way back against shown stay way during glide Otherwise glide trim will thrown off Full-Size Plans Available. See Page 196 I/IA I/A HALSA WEBS 1/B BALSA SPAR NO DIHEDRAL BREAK AT CENTER LINE WIN~ PlAN I4 SO BALSA LEADING EDGE DIHEDRAL BREAK RAISE WING TIP 4-1/4 imi~ _[-t___ OUBL TOP 0 3 -- F AR BALSA 29 OF UK BALSA GA HESHEAR WEE AT DIHEDRAL JO/AT LEL I/H HARD BALSA_ IM OP I/3D LEDIHEDRAL WING RIB PATTERN BRACEAIRFOIL IS DUNHAM-BARER- REEHOK 00KGOLDBERG PASTIC IDE OFZ AGR AS THE WHEEL OLLAR FAI MODEL SUPPLY RGLL TEREARING AND SPRINO 3D PLO NCE WREI/IA ID TUBE GAVB SPRUCE KES HEW WITH EMOVED NOSE/PROP DETAILI/IA BALSA SHEET S/A UPRJCE I/RBALSATF-I B F-B SHEET___________ F-234 aUNT WINS INCIDENCE 0 ICALE Ir\IIilIIIIITi~ F-I FOED CUFHF5 I/B 3/IA SPRCE RAILS / FUSELAGE SIDE VIEW I/H GO BALSA DOG BLER I/A BALSA SHEET GUSSETS /H SG RGLSA LE I/H SO EALSA DOUBLER I/A RALSA4 \JL/ N SHEET TP END IEW I/H BALSA SHEET RIBS AT DIHEDRAL BREAK 1/ H PLY I/IA BALSA VIA BALSA SHEET/64 PLO I/3D HALSA SHEET SHEAR WEBS STAB STAB DIAGONAL I/IA BA3A SHEET PROP BEARING DETAIL NO SCALE TWO I/H HALSA SHEETS CROSS URANED ALUM SODA CAN HEAT SINE BOTH I/A DIASIDES MOTOR PIN NOTE COMPLETE MODEL RTF WITH MOTOR THEN GLUE WING MOANT ON WITH ARKED ON WING MOUNT OVER ACTUAL C S I/B I/IA BALSA SPARS TOP AND BOTTOM STABILIZER VIE BALSA RIBS /8 50 BASA- TRANS EDGE I/IA HASA DI AS ON ALS I/H BALSA SHEET 1/4 BALSA INCIDENCE BLOCK-TRIM FOR RUDGER TAB -DD TO -3 INCID I/A EFT I/lA PLY SHOC MOUNT 1/H ALUM TUBE CRIMP ALUM TUBE 1/4 BALSA I/H BALSA I/ADD ALUM TUBE THRA FUSELAGE /16 BALSA SHEET DOURLER PAPER CLIPCRIMP ALUMTRACING BY OE DEMARCO HOOKTUBE MODEL ATION CONSCIENTIOUS OBJECTOR DESIGNED BY BILL BAKER reinforce tube holes made fin can made %-in light sheet balsa save weight cant find four- six-pound sheet built-up fin could used course would prone battle damage install fin lay tube its side flat table Block up fin books pieces wood its centered tube parallel table glue place As long fin parallel direction flight symmetry tail cone critical Ron Robertti once told tail aint straight retorted thing needs turn anyway Covering fuselage cover tubes tissue sometimes silk Ive also used polyester cloth intended dress making Its very tough comes pretty colors wrinkles can elimi nated through heat shrinking down side its little heavier other materi als next tube Id like try O6-oz fiberglass cloth clear dope adhe sive dont usually cover tail cones fins would use tissue did un covered areas including prop usu ally finished Deft semigloss wood filler/sealer available hardware store stabilizer quite conventional Its also lightweight trouble-free Note both leading trailing edges made A-in-sq stock Round off leading edge put slight taper trailing edge Beauty second ary lightweight warp-free construc tion model flying speeds slow wide sharply tapered trailing edge would simply excess weight Hence truncated trailing edges used both stabilizer wing Note point needed con nect both DT dethermalizer limit line front stab hold-down rubber Also note absence need sheet fill September 1990 77 Continued page 180 Three Mulvihill standouts author Bill Baker left George Perryman center Jim OReilly placed first second third both 1979 1982 AMA Nats ALL STAINLESS STEEL HEAD LITE IItm BEST GLOW PLUG CONNECTOR Stainless Steel HEAD LOCK BEST DESIGNAll Welded No Solder Acid Flux Flexing Wires BEST NiCadField Replaceable 12 AH SANYO 15 AH PANASONIC BEST QUALITY & GUARANTEE MODEL PRODUCTS CORPORATION BEST PRICESt #045-WIO NiCad Charger$ 995 available write directSt #040-With NiCad$ 1595 add $100 $200 outside US St #041-With NiCad & Charger $ 2595 MODEL PRODUCTS CORP RO Box 100 Allamuchy NJ 07820201850-1508 have coloring model planes using method years Unlike Floquil butyrate-jar skimming inexpensive food markets fabric outlets sell Rit dyethe powdered kind comes infinite variety colors can used straight blended just right color use baby food jars mixing Open pouch Rh dye pour few beads jar pour some dope thinner acetone top will surprised quickly thin ner snatches color dye Keep blending using raw balsa sticks test against color sam ple want match Once satisfied add about 20% clear dope mix always put couple thin coats clear dope model first prevent creeping Rit will give lively-looking color saving little jar will allow patching later Just add thinnerthere no pigment Work takes longer tell about FF Scale/Warner Continued page 73 Investigation problem turned up fact Federal Standard screwed up 1964 changed color standard original WW II olive drab new kept old number F534087 confuse modelers restorers make things worse Uncle Sam gave same number very dark brown olive drab March 1979 meant modelers three FS34087s choose January 1984 34087 reappeared original shade gloss semigloss versions OD dark brown version 1979 14087 24087 June 1984 GSA decided straight en things out issued change notice ef fect color chip 34087 dated March 1979 wrong color shall used colors 14087 24087 34087 represent two different colors lors have re numbered follows 14087 now 14084 24087 now 24084 34087 now 34088 makes five matte olive drabs pre-1964 34087 post-1964 34087 March 1979 34087 wrong color 1984 34087 1984 Change Notice 34088 same color later 34087 new FS595B being printed riht now should take care confusion right Dont count Don suggests build Navy aircraft forget about olive drab alto gether case its nice see company concerned about getting right Perhaps thats cause Don perfectionist kind person would balance wheel wheelbarrow Czech submarine contest high points life getting news what other modelers doing Id like share Lubomir Koutnys account contest Czechoslovakia likes drought-ridden Califor nians long Boys Zabreh north Moravia began arrange A0-scale contest little town did very well am sorry weather perfect submarine contest rain damp air very well Scale big perfect varnish like Straniks twin Batman won Other boys give Scales over hot car engine before next flight get idea guess spoiled re member flying guys southern France flew rain shine often packed model boxes cars after sunset Plastic vs rubber have hearing nasty rumors late rubber stored plastic con tainers may deteriorating accelerated rate might due outgassing plastic container have rubber stored type container length time under optimal conditions airtight out heat might want check out let know harm seems have done Im sure other readers would really happy know whether good way store precious rubber motors Well until next time guys gals always re member Dont dope models sandstorms things wont too rough Conscientious/Baker Continued page 77 stab lightweight aligns itseli small notch DT line tht trailing edge action SHOC-typt stab front mount centers leading edgc well enough negating need keying An added advantage system thaI its free move meeting obstruc Man turer Hi Performa utba$Is andraft CULPEPPER C MODELS INC 2526 Washington DubuqmIA 520411 31015834830 180 Model Aviation PRODUCTS FOR THE O4SCERNING MODELER FF Duration/Linstrum Continued page 71 Made America American Technology RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Fot-ster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Coil wrte free information RJL Industries PO Box 5 Sierra Mack-e CA 91025 818 359-0016 Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanshin & Perfomance Serious Horsepower3 0S ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shade Performance Specialties Send $1 00for fully illustrated catalog Available VS Long & Short Stroke 06 Long Stroke 06 6IFSR 06 40 VRP/VF 06 91 VRDF STX-40 Rossi 40 coming soon mare information Call 619 729-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 tion would break keyed stabilizer notched peg holds rubber DT line can made A6 ply popsi cle stick tongue blade wood dowel aluminum tubing peg mounting platform stabilizer should also /~ ply peg must able withstand certain amount strain Wing heavy-duty spar shown plans Ive never broken wing Maybe spar too heavy like up per main spar can made either very hard balsa spruce other spars can medium 8-10-lb balsa shear webbing between spars very important Installing pieces along centers spars shown plan ideal find making full depth locating along side easier adequate -in hard balsa angled center dihedral brace can also made full depth Shim up rib fronts A2 above leading edge small taper cut can made will shape leading edge conform undercambered ribs Shim up rear end ribs trailing edge A2 same reason wing can built jig youre going build several wings jig highly recommended jig used airplane allowed wing built piece except lower spar added air later use jigs dates discovery warps plagued induced during process adding dihedral dont usually shim washout since about washout seems occur auto matically tissue doped wing mount motor tube de signed lightweight rigid platform wing rest quick way achieve perfect fit wrap piece sandpaper around tube lightly sand mount base shape Dont glue wing mount fuselage until model ready fly must adjusted achieve correct CG center-of-gravity After mount glued place make sure theres enough stabilizer tilt produce left turn Propeller may try write detailed arti cle propeller carving soon sub ject has covered thoroughly else Wood selection primary impor tance block should hard about 14 lb uniform density produce blades both thin strong Lay out top bottom profiles making sure centerline top profile parallel edge block same bottom line side profile Set block drill press drill hole hinge Cut out profiles band saw Carve bottom blades first com pletely finishing before starting top sure keep track right left blades once carved six left-handed blades before realized what doing Thank fully wife saved day suggesting carve six right-handed blades Try about /16 undercamber midblade progressing no undercamber tip Begin carving top blade get ting down about A-in thickness Make high point airfoil its helpful mark about one-third chord Take time Carve thin slices chunks Shape blade aft high point sort triangular profile start final shaping leading one-third high point thickest part blade should about /16 tip midblade Add A4 A2 ply doublers /32 OD tubing hinge Place blade Z-bar hub drill holes limiting pins A6 drill mounted pin vice Take extreme care drilling holes blades track properly sight turning blades pro file should perfect alignment other Finish propeller Deft equivalent cant find Deft local hardware store Ive noticed listed Lee Campbells catalog nose plug made A-in sheet balsa laminated cross-grained first lam mate fits inside motor tube sec Electric Flight f Controller Perfect 05 Motors 510 cells 2mooth Has Brake Lightweight 12 Adjastobte switching pointssoney hock Soldertess tenssisot ror easy hookup guarantee ON/OFF Controller $2495 Power save weight very high efficiency ossty O06V loss 77 22x13x63 Colifoneejo residents add 65% $163 Tax Add $100 foe shipping Send Check money order wessaitiHigh Sky Futaha cossoetoc Kansas St #9 othn availableSan DiegoCA 92104 23rd consecutive year covering continues go easier & last longer rest Congratulations Super Coverite September 1990 181 JET bust completely finished authentically detailed poseable 1/8 scale Al QC1Ir pruu209 2244170 II p0 box 5631fresno Ca 93755 II ond should conform outside shape tube brass aluminum tube can inserted plug smaller pieces tubing approximately 1/8 long inserted end form bearings wire prop shaft Use Loc-Tite similar product adhere inner pieces tubing outer tube Use CyA cyanoacrylate glue install completed bearing nose block Add plywood face least large external ball bearing wont crush balsa Use good spring such available through FAI Model Sup ply Dont use ball-point pen spring other cheap alternative might take set Make Z-bar out A6 music wire Use Sta-Brite equivalent hard solder Never trust soft solder hold propeller hub together First balance Z-bar alone attach blades balance again used make batch blades pairmatch according weight simi larity As recall averaged eight 10 grams try dont get confused about right- left-handed blades did winding hook shown plan works quite well rubber will stay cen tered unless Newton wrong dont understand winding hooks winding tubes stooges other aspects rubberpowered model technology buy Don Ross book Rubber Powered Model Airplanes AMA Supply Service catalog motor made up enough 34-in strands weigh 85 90 grams dry Consis tency whats wanted should no slack used size motor Mulvi hills nearly Old-Timer Rub ber models such Lanzo Stick Korda Dethermalizer may able everything thing did learn wind motor consistently Trying get used different motors dif ferent models can very stressful con test time Life John Wayne says movie Iwo Jima tough its tougher youre stupid Keep simple Choose motor get used Youll make fewer stupid mistakes under pressure competition Trimming balancing center-ofgravity shown plan best allaround thermal windy weather flying flying early morning still air CG could moved slightly aft decalage reduced model designed stability reliability rather absolute max imum performance Set SHOC stabilizer mount about /l6 tail cone making careful cuts Zona saw removing wood tween cuts create flat spot sup port mount should tilt slightly right making left tip about er right wing mount should have no inci dence relative motor tube deca lage established angle stabi lizer sitting aft block under its trail ing edge angle should two three degrees about / higher trailing edge Glue wing mount place mo tor loaded making sure balancing mark 6ver CG Use large table square set wing mount square motor tube key gluing /16 x A-in balsa strips bottom wing across chord wing goes same position time cant shift dur ing flight will happen its left un keyed Key nose block assembly fuse lage bit A-in ply needed LANDER INDUST 1005 19TH ST CT HAYRE MONTANA 59601 4062656529 BUILDING BOARD 30x48 $4895 ncf 24 X 66. $6395 inc frI CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surface bonded 3/4 laminated warp tree base straight true work surface will last years years CHECK EM ALL OUT English Lcitlicr CALENOAR GIRL CNALLENGE 19 AUG AC MODELER NW 503 646-4531 PORTLAND OR 26 AUG JOES HOBBY CTR 313 933-6567 DETROIT Ml 9/22/23 CENTRAL PENN 717 564-3280 HARRISBURG PA $2500 STARHAWK FUN FLY NEW STARHAWK BIPLANE NEW MISS STARHAWK POSTER See Starhawk Dealer details write Thorpe Engineering Corporation 1715 E Fairfield Mesa AZ 85203 Poster $500 P&H Prepaid 182 Model Aviation Airtronics powerful 94141 Mian Servo strongest servo its size ever produced Compactly designed Ito provide max imum torque space restrictive RC applica tions precision ball bearing 94141 well suited types ahtraft Compatible Airtronics radio systems 94141 ideal use sailplane flaps ailerons formula pylon air craft electric R/C alitraft rued 94141 servo utilizes metal output gear coupled durable metal molded gear train Its reinfoned case features unique side mounting brackets allow easy horizontal servo place ment inside aircraft wings information about Airteunics quality pmducts please call write address above 94141 Specifications Part Number 94141 Description Precision High Torque Ball Bearing Micro Servo Dimensions L 137 36mm W 060ISmm H 127 325mm Weight118 oz 33 grins Torque 45 oz/in 32 kg/cm Transit Time 025 seconds 600 rocacion Equipped splined stand ard size servo arm 94141 features ball bearing supported output shaft high quality coreless motor advanced electronic componentry No cornparably sized lightweight servo matches superior strength high torque powerful performance Airtronics 94141 I\hcro Servo SetThe Standani jAIRTRONICS INC Autry Irvine CA 92718714 830-8769 wood screw stop Dont omit screw will tear out balsa stop against screw nose plug place its blades folded either side motor tube determine best placement in spruce key locks nose block against rotation Zona saw cut away inner nose block ring key slot motor tube match photo will clarify operation Its im portant have two key points distri bute shock shaft striking screw prop has lot kinetic en ergy keys take quite load Its also good idea double motor tube covering material around key slots hooks seen photos proSMALL RIC HOBBY DEALERS! WE ARE DISTRIBUTOR KEYED TO YOUR PARTICULAR NEEDS information write call Southern Hobby Distributors 256 Madison Blvd Madison TN 37115 615 868-2100 1030 AM 500 PM CST peller blades made soft wire such paper clip Note location hooks somewhat aft hinge line blades folded rubberband hook goes over front Z-bar back other hook Change rubberbands before contest two reasons First its very important blades fold way back against mo tor tube stay way otherwise glide trim will thrown off Second rubberbands deteriorate very rapidly sun drafting triangle again using trusty worktable square check propeller blades track identical angle blade Also check static hAYALOISSRSSEOESASS DOGS X&.DIMS CONrAIl FUSE SIZE RECORDS MOM 97005 FATNDHASEOASSAMLM SHOE SOOTHEASTERN NE 19399AETELEHAS BEER ABE BOMBER AESOARIXSPETENRE vED LAER ER balance like Z-bar shown aluminum hub FAI Model Supply could substituted Cut small rudder tab about /a x 1 /2 trailing edge fin glue back place approximately /I6 left deflection small carpenters square check front end motor tube downthrust right thrust angles should about l should weigh about eight ounces ready fly 90 grams about three ounces contributed motor Oil propeller bearings lube motor youre ready fly Flight testing trim adjustment U3- Corter Rubber Band Powered He1icoper Flying repeatibillity coniStflt remult Flyn FOISWAI5D 5 gacewans nanEns TUESS CAM EBSI Fly IN TESTES HAD NO FEaTURES hPOHrrSApplitd BatS & Paper CENS$PEHIiON Setailed liSp ISep NStFOciiSflS 555tH pSPtS mE-COTinILLEM ASM AirIranse irreStly Sn FULL SIZE PLANS IS ISMS EESy ESSeFAIS / 7/ \T HhSlD 9O PD September 1990 183 Small Wonder ZAP UNIVERSITY COLLEGE OF GLUE KNOWLEDGE RONS MODEL Radio Controiled BUILDINGAirplanes Other Aircraft Boats 213 451-0414 ii Build Ry model should climb right turn glide left Glide controlled stabilizer tilt thickness aft incidence block Climb adjusted after satisfac tory glide trim has established Adjust climb small changes thrust line Thrust adjusted gently filing end motor tube change angle nose block rests very small increments Dont fly full power until youre completely satisfied models trim Make sure model climbs right turn avoid tendency loop hang prop power stall youre ready fly full power launch model about 450 angle tends go its pointed have flown few Conscientious Objectors just didnt want turn left glide ri diculous amount tilt stabilizer simply let turn right glide well climb Still unless really know what youre doing left glide right climb safe way go Dethermalizer accompanying photo dethermalizer shows its layout quite clearly guide tube under SHOC sta bilizer mount has multiple functions con ducts DT line keeps stabilizer rub bers touching line serves DT limit stop piece monofilament line can used DT line loop end fitted over peg top sta bilizer rubber must installed over loop stay place rubber loops over peg extends across leading edge stabilizer goes down around fuselage back up peg bit fuel tubing serves nicely DT line limit can tied line simple overhand knot adjusted strike line guide tube under SHOC mount tubing should adjusted allow about 450 stabilizer DT angle Tied other end DT line paper clip wire hook fuse rubberband extends hook across fuse around motor peg Use sharpened piece aluminum tubing drill holes fuselage makes cleaner hole does drill Use A-in tube fuse holder extending through both sides fuselage way can poke fuse material through piece wire can also pull out bit fuse case delay between lighting launching Glue tube firmly place heat sink can made alumi num can must selected care Ive used Coors Light cans cant say whether another brand would work well will gladly try answer questions might have about Conscientious Ob jector Send SASE 1902 Peter Pan St Norman OK 73072 responding advertisers mention read about Model Aviation Convert/McKinley Continued page 82 charge rather three some plan ning use small battery packs can aim think 20- 30-sec motor runs climb rates equal glow- ignition-powered models little no weight penalty Rally/Homer Continued page 88 forget did didnt fly AMA Rally Scobie Field Nor will other Houston modelers Bomber Field Club planning major event October Sev eral B-17s air simultaneously would something behold AMA Frequency Committee member George Steiner traveled Sacra mento CA teamed Bob Spivey Aus tin TX handle transmitter impound chores Charlie Marilyn Stevens Vance Dottie Wyman coordinated host local volunteers assist planning running event course rally would have possible efforts AMA HAMCI staff volunteers AMA Presi dent Don Lowe District VIH Vice Presi dent Gene Hempel AMA Executive Di rector Vince Mankowski hand Continued page 188 184 Model Aviation Caii Write 435 San Vicente Bivd J Santa Monica CA 90402 turn yoor printer lot oil plotter with.. FOILED AGAIN! C PLOT AIRFOILS IN ANY CIIORD u 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR 5HEETED WINGS ENTER DATA EASILY VIA INTELUGENT EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES 18-PAGE ILLUSTRATED U5ER MANUAL $45oo a cram prom slain ~2Z4i IiwflaihOO COopuV ira dot INI Clv conwaS potfli tWo w* irding ipioty 550 o 30 dOic Sm ram urocoy ordi CYGNET Software714 4966961 24843 Del Prado #141B Dana Point CA 92629 CAPACITIVE-DISCHARGE IGNITION SEA5 AMAN No moving parts No eng ne mod oat ons Basic unit $ 9995 Opposedcylinder twin $ 11995 ELECTRONIC CIRCUITRY REPLACES ANY MECHANICAL ADVANCE MAKES MAGNETO CONVERSIONS SNAPII
Edition: Model Aviation - 1990/09
Page Numbers: 74, 75, 76, 77, 180, 181, 182, 183, 184
Conscientious Objector Looking model can stand up rough-andtumble AMA Cate gory II Ill competitionand win robust rubber-powered Mul vihill good bet EBill Baker MOST MULVIHILL DESIGNS have published seem intended Category competition five-minute maxes judge relatively large fragile struc tures designed succeed events flown under AMA Category II III rules knew contests Id flying would involve windy weather small rough fields time Category II III rules would hold three- twominute flight times first three flights Conscientious Objector somewhat smaller typical Mulvihill design its also much less fragile model ca pable five minutes early morning air wont much good wing folds first windy flight gets beat shreds push five maxes just reach requirement five-minute max model competitive Id hoped will three minutes easily tactic fly early getting first three four flights before wind downdrafts strengthen try pick up some lift four- five-minute maxes Most competition will elim inated thensometimes can look back half-century model building Ive enjoyed being involved nearly facet hobby Ive flown CL RC mostly sport flier course have flown practically type Free Flight model known Most competition flying has Free Flight concentrating Gas events dropped out Free Flight about 1964 flew RC until 1976 Around time old Free Flight urge crept up again attended contest see what changed decided would fun learn new event like Rubber rather falling back old Gas groove happened long before Bob Dunham published Draft Dodger April 1975 issue Flying Models Id long awe Dunhams great-flying Rubber models Draft Dodger im mediately claimed interest Mass-produced Draft Dodger parts tum bled out workshop like Henry Ford cars point early process counted three wings five fuselages four stabs four props just keep two mod els flying competition surprise novice Rubber flier time models flew very well win ning contests 1979 started making few changes important rolled balsa tube fuselage did nothing im prove performance fuselage much less prone damage also rede signed wing mount modifications added up very practical Category Ill w model dubbed Conscientious Objec tor because wasnt exactly Draft Dodger anymore took both stock Draft Dodger newly evolved Conscientious Objector 1979 Nationals CO very high pitch prop giving longer slower climb contrast explosive power burst generated low-pitch prop Draft Dodger Wind conditions very strong blowing right across ocean corn two planes allowed event strat egy fly Draft Dodger first four flights knowing within three min utes would either corn OOS out-of-sight would likely lost fourth flight held Conscien tious Objector reserve fifthand hoped winningflight strategy worked though 74 Model Aviation Above The author showing off Conscientious Objector wheatfield near Norman OK No oil well background Isnt Bills probably wouldnt object owner bequeathed him Below authors iong-sufferlng hungry wife Paula holding up model show its lines promise lunch soon ordeal over Draft Dodger damaged after flight mostly wing mount damage diagonals broken out its explosive climb rate model flew through ground turbulence slower climbing Conscientious Ob jector wouldnt have able cope Still using tubular fuselage contin ued adapt Conscientious Objector un til virtually no remaining parts identi cal Draft Dodger guess difference between plagiarism research sources borrow adapted prop published years ago Frank Parmenter borrowed stabilizer structure Bob Whites Twin Fin also used simple Z-bar-type propeller hub copied wing mount few other ideas Jim OReilly invented better winding hook worked out sim ple reliable dethermalizer setup probably owes something lot differ ent people tried longer motor tubes va riety wings some area dif ferent dihedral schemes others differ ent airfoils experimented sev eral propellers model presented represents what judgment best compromise achieving key objective Mulvihill thats competitive Category III might want increase wing area 300 sq motor tube 42 model will serve flyoff five minute rounds Category may also want increase propeller diameter half-inch 95% Mulvihill flying done US model pre sented very competitive After 1979 AMA Nationals win Draft Dodger flew two Na tionals under Category III rules placed both third fifth time Conscientious Objector failed place Nats event surprise flown under Category rules As time went interests shifted Old-Timer events began attending SAM Champs instead AMA Nats Nevertheless continued well Conscientious Objector local re gional contests until found myself unable meet physical demands Free Flight competition present Im enjoying RC Sailplanes Conscientious Objector has permanent niche affections Id like think somewhere someone will flying Category III Mulvihill winning Construction motor tube fuselage houses mo tor also holds other parts air plane proper relationship another Though several fuselages built square cross section found tube config uration has best strength-to-weight ratio Use A6 x 4-in-wide 6- 8-lb A-grain balsa Make sure wood uniform density grain through entire length piece its much harder edge other transitions C-grain dont use Using metal straightedge trim sides true Seal wood side two coats Deft semigloss clear dope Sand gently between coats dry wet entire piece water will cause curl unpainted side expands Form wet balsa around 1 A-in-dia dowel after first scoring line down center dowel align balsa Largediameter dowels can procured hardware store lumber supply company believe theyre intended clothes closet hanging rods Jim OReilly once suggested using fluorescent tubes form motor tube Fearing would fall off ladder dur ing construction opted wood dowel Its also easier carve tail cone wood Ever try carving fluorescent tubing Wrap wood gently strips cloth gauze Ace bandage let dry Remove wood dowel apply Titebond along edges draw together Secure bits masking tape allow dry Make one-inch-wide nose doubler tail doubler about 1 wide simi larly prepared balsa doublers will Left Looking underside wing mount can see two lengths oil/a x 1A-in balsa used key wing pylon mount piece glued side wing pieces also serve fill gap between top pylon bottom undercambered wing Right Construction details wing mounting pylon side rails I/ x % spruce An easy way shape base pylon wrap sandpaper around motor tube sand pylon base perfect before final installation September 1990 75 Close-up view simple effective reliable dethermalizing mechanism motor peg tube fuse tube aluminum drink can heat sink can seen fuselage forward fin Small pieces %-in aluminum tubing serve guides limit line slip inside tube Glue place Titebond similar product sure let aft doubler protrude tube about youll have something glue tail onto tapered end forming dowel plane rasp easily form tail cone amount taper isnt crit ical 1 /4 narrowing 34 about right Make circular former hard -in balsa two cross-grained /16 pieces Fit former inside aft doubler end motor tube will prevent damage tapered cone should motor break Place another -in former area SHOC mount multifunction stabilizer mount attributed Sky Hoppers ange County California Dont worry rolled tube isnt per fectly circular Lay table allow roll until stops Let flat spot side top bottom 900 discernible curvature tube let concave side bottom joining tail cone eyeball closely can isnt perfect cone mount top forms straightest line motor tube motor pin must strong since tre mendous force exerted upon pin must course removable order change motors Use least A-in pin 1/2 SOFT BALSA WING TIP 9 SECTION DIHEDRAL BREAK RAISE T P 4 1/4 1 22I ZV LLI Ii 1/16 BAlSA SHEET 00155 DIGS 3/32OSIIRI S I/IA WIRESLIM ThBE RINK HOLE THIS LINE PARALLE 1/32PLYTO ESSE OF BLOCK PROP ERN n OCT COTTOM CC TOO TO MANO MRPOL SDOPE FRORT THIN TOrISOL CORNER TOIC4 TDICN AT HOC COIRT S THIRDSTOOL PROP BLADE CROSS SECTIONS NOT TO SCALE 3/32OIA3/5 015 HOLE HOLES /5 ALJMPJJM WINDING HOOK NOTE 3/64 TO 116 DOWN THRUST FOSELASE IS TJBE MADE BALSA SHEE 76 Model Aviation proplhub/nose block mechanism offset slot motor tube clearly seen offset makes impossible mount nose block upside down plastic press-on wheel collars attach blade Z-bar must leading edge theyll thrown off along blades creating lot noise very little thrust crashed airplane Another view prop/hub/nose block assembly showing doubled blade hinge assembly Zbar spring bearing motor hook Complete instructions carving blades nose block fashioning hub mechanism included text clearly detailed plan Finished aluminum hubs function just well can purchased through FAI Model Supply Wing jigs important especially mass-producing wings jig building wing shown plan background foreground jig polyhedral variant prop/hub/nose block assembly attached motor tube Note blades fold flush against tube its important fold way back against shown stay way during glide Otherwise glide trim will thrown off Full-Size Plans Available. See Page 196 I/IA I/A HALSA WEBS 1/B BALSA SPAR NO DIHEDRAL BREAK AT CENTER LINE WIN~ PlAN I4 SO BALSA LEADING EDGE DIHEDRAL BREAK RAISE WING TIP 4-1/4 imi~ _[-t___ OUBL TOP 0 3 -- F AR BALSA 29 OF UK BALSA GA HESHEAR WEE AT DIHEDRAL JO/AT LEL I/H HARD BALSA_ IM OP I/3D LEDIHEDRAL WING RIB PATTERN BRACEAIRFOIL IS DUNHAM-BARER- REEHOK 00KGOLDBERG PASTIC IDE OFZ AGR AS THE WHEEL OLLAR FAI MODEL SUPPLY RGLL TEREARING AND SPRINO 3D PLO NCE WREI/IA ID TUBE GAVB SPRUCE KES HEW WITH EMOVED NOSE/PROP DETAILI/IA BALSA SHEET S/A UPRJCE I/RBALSATF-I B F-B SHEET___________ F-234 aUNT WINS INCIDENCE 0 ICALE Ir\IIilIIIIITi~ F-I FOED CUFHF5 I/B 3/IA SPRCE RAILS / FUSELAGE SIDE VIEW I/H GO BALSA DOG BLER I/A BALSA SHEET GUSSETS /H SG RGLSA LE I/H SO EALSA DOUBLER I/A RALSA4 \JL/ N SHEET TP END IEW I/H BALSA SHEET RIBS AT DIHEDRAL BREAK 1/ H PLY I/IA BALSA VIA BALSA SHEET/64 PLO I/3D HALSA SHEET SHEAR WEBS STAB STAB DIAGONAL I/IA BA3A SHEET PROP BEARING DETAIL NO SCALE TWO I/H HALSA SHEETS CROSS URANED ALUM SODA CAN HEAT SINE BOTH I/A DIASIDES MOTOR PIN NOTE COMPLETE MODEL RTF WITH MOTOR THEN GLUE WING MOANT ON WITH ARKED ON WING MOUNT OVER ACTUAL C S I/B I/IA BALSA SPARS TOP AND BOTTOM STABILIZER VIE BALSA RIBS /8 50 BASA- TRANS EDGE I/IA HASA DI AS ON ALS I/H BALSA SHEET 1/4 BALSA INCIDENCE BLOCK-TRIM FOR RUDGER TAB -DD TO -3 INCID I/A EFT I/lA PLY SHOC MOUNT 1/H ALUM TUBE CRIMP ALUM TUBE 1/4 BALSA I/H BALSA I/ADD ALUM TUBE THRA FUSELAGE /16 BALSA SHEET DOURLER PAPER CLIPCRIMP ALUMTRACING BY OE DEMARCO HOOKTUBE MODEL ATION CONSCIENTIOUS OBJECTOR DESIGNED BY BILL BAKER reinforce tube holes made fin can made %-in light sheet balsa save weight cant find four- six-pound sheet built-up fin could used course would prone battle damage install fin lay tube its side flat table Block up fin books pieces wood its centered tube parallel table glue place As long fin parallel direction flight symmetry tail cone critical Ron Robertti once told tail aint straight retorted thing needs turn anyway Covering fuselage cover tubes tissue sometimes silk Ive also used polyester cloth intended dress making Its very tough comes pretty colors wrinkles can elimi nated through heat shrinking down side its little heavier other materi als next tube Id like try O6-oz fiberglass cloth clear dope adhe sive dont usually cover tail cones fins would use tissue did un covered areas including prop usu ally finished Deft semigloss wood filler/sealer available hardware store stabilizer quite conventional Its also lightweight trouble-free Note both leading trailing edges made A-in-sq stock Round off leading edge put slight taper trailing edge Beauty second ary lightweight warp-free construc tion model flying speeds slow wide sharply tapered trailing edge would simply excess weight Hence truncated trailing edges used both stabilizer wing Note point needed con nect both DT dethermalizer limit line front stab hold-down rubber Also note absence need sheet fill September 1990 77 Continued page 180 Three Mulvihill standouts author Bill Baker left George Perryman center Jim OReilly placed first second third both 1979 1982 AMA Nats ALL STAINLESS STEEL HEAD LITE IItm BEST GLOW PLUG CONNECTOR Stainless Steel HEAD LOCK BEST DESIGNAll Welded No Solder Acid Flux Flexing Wires BEST NiCadField Replaceable 12 AH SANYO 15 AH PANASONIC BEST QUALITY & GUARANTEE MODEL PRODUCTS CORPORATION BEST PRICESt #045-WIO NiCad Charger$ 995 available write directSt #040-With NiCad$ 1595 add $100 $200 outside US St #041-With NiCad & Charger $ 2595 MODEL PRODUCTS CORP RO Box 100 Allamuchy NJ 07820201850-1508 have coloring model planes using method years Unlike Floquil butyrate-jar skimming inexpensive food markets fabric outlets sell Rit dyethe powdered kind comes infinite variety colors can used straight blended just right color use baby food jars mixing Open pouch Rh dye pour few beads jar pour some dope thinner acetone top will surprised quickly thin ner snatches color dye Keep blending using raw balsa sticks test against color sam ple want match Once satisfied add about 20% clear dope mix always put couple thin coats clear dope model first prevent creeping Rit will give lively-looking color saving little jar will allow patching later Just add thinnerthere no pigment Work takes longer tell about FF Scale/Warner Continued page 73 Investigation problem turned up fact Federal Standard screwed up 1964 changed color standard original WW II olive drab new kept old number F534087 confuse modelers restorers make things worse Uncle Sam gave same number very dark brown olive drab March 1979 meant modelers three FS34087s choose January 1984 34087 reappeared original shade gloss semigloss versions OD dark brown version 1979 14087 24087 June 1984 GSA decided straight en things out issued change notice ef fect color chip 34087 dated March 1979 wrong color shall used colors 14087 24087 34087 represent two different colors lors have re numbered follows 14087 now 14084 24087 now 24084 34087 now 34088 makes five matte olive drabs pre-1964 34087 post-1964 34087 March 1979 34087 wrong color 1984 34087 1984 Change Notice 34088 same color later 34087 new FS595B being printed riht now should take care confusion right Dont count Don suggests build Navy aircraft forget about olive drab alto gether case its nice see company concerned about getting right Perhaps thats cause Don perfectionist kind person would balance wheel wheelbarrow Czech submarine contest high points life getting news what other modelers doing Id like share Lubomir Koutnys account contest Czechoslovakia likes drought-ridden Califor nians long Boys Zabreh north Moravia began arrange A0-scale contest little town did very well am sorry weather perfect submarine contest rain damp air very well Scale big perfect varnish like Straniks twin Batman won Other boys give Scales over hot car engine before next flight get idea guess spoiled re member flying guys southern France flew rain shine often packed model boxes cars after sunset Plastic vs rubber have hearing nasty rumors late rubber stored plastic con tainers may deteriorating accelerated rate might due outgassing plastic container have rubber stored type container length time under optimal conditions airtight out heat might want check out let know harm seems have done Im sure other readers would really happy know whether good way store precious rubber motors Well until next time guys gals always re member Dont dope models sandstorms things wont too rough Conscientious/Baker Continued page 77 stab lightweight aligns itseli small notch DT line tht trailing edge action SHOC-typt stab front mount centers leading edgc well enough negating need keying An added advantage system thaI its free move meeting obstruc Man turer Hi Performa utba$Is andraft CULPEPPER C MODELS INC 2526 Washington DubuqmIA 520411 31015834830 180 Model Aviation PRODUCTS FOR THE O4SCERNING MODELER FF Duration/Linstrum Continued page 71 Made America American Technology RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Fot-ster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Coil wrte free information RJL Industries PO Box 5 Sierra Mack-e CA 91025 818 359-0016 Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanshin & Perfomance Serious Horsepower3 0S ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shade Performance Specialties Send $1 00for fully illustrated catalog Available VS Long & Short Stroke 06 Long Stroke 06 6IFSR 06 40 VRP/VF 06 91 VRDF STX-40 Rossi 40 coming soon mare information Call 619 729-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 tion would break keyed stabilizer notched peg holds rubber DT line can made A6 ply popsi cle stick tongue blade wood dowel aluminum tubing peg mounting platform stabilizer should also /~ ply peg must able withstand certain amount strain Wing heavy-duty spar shown plans Ive never broken wing Maybe spar too heavy like up per main spar can made either very hard balsa spruce other spars can medium 8-10-lb balsa shear webbing between spars very important Installing pieces along centers spars shown plan ideal find making full depth locating along side easier adequate -in hard balsa angled center dihedral brace can also made full depth Shim up rib fronts A2 above leading edge small taper cut can made will shape leading edge conform undercambered ribs Shim up rear end ribs trailing edge A2 same reason wing can built jig youre going build several wings jig highly recommended jig used airplane allowed wing built piece except lower spar added air later use jigs dates discovery warps plagued induced during process adding dihedral dont usually shim washout since about washout seems occur auto matically tissue doped wing mount motor tube de signed lightweight rigid platform wing rest quick way achieve perfect fit wrap piece sandpaper around tube lightly sand mount base shape Dont glue wing mount fuselage until model ready fly must adjusted achieve correct CG center-of-gravity After mount glued place make sure theres enough stabilizer tilt produce left turn Propeller may try write detailed arti cle propeller carving soon sub ject has covered thoroughly else Wood selection primary impor tance block should hard about 14 lb uniform density produce blades both thin strong Lay out top bottom profiles making sure centerline top profile parallel edge block same bottom line side profile Set block drill press drill hole hinge Cut out profiles band saw Carve bottom blades first com pletely finishing before starting top sure keep track right left blades once carved six left-handed blades before realized what doing Thank fully wife saved day suggesting carve six right-handed blades Try about /16 undercamber midblade progressing no undercamber tip Begin carving top blade get ting down about A-in thickness Make high point airfoil its helpful mark about one-third chord Take time Carve thin slices chunks Shape blade aft high point sort triangular profile start final shaping leading one-third high point thickest part blade should about /16 tip midblade Add A4 A2 ply doublers /32 OD tubing hinge Place blade Z-bar hub drill holes limiting pins A6 drill mounted pin vice Take extreme care drilling holes blades track properly sight turning blades pro file should perfect alignment other Finish propeller Deft equivalent cant find Deft local hardware store Ive noticed listed Lee Campbells catalog nose plug made A-in sheet balsa laminated cross-grained first lam mate fits inside motor tube sec Electric Flight f Controller Perfect 05 Motors 510 cells 2mooth Has Brake Lightweight 12 Adjastobte switching pointssoney hock Soldertess tenssisot ror easy hookup guarantee ON/OFF Controller $2495 Power save weight very high efficiency ossty O06V loss 77 22x13x63 Colifoneejo residents add 65% $163 Tax Add $100 foe shipping Send Check money order wessaitiHigh Sky Futaha cossoetoc Kansas St #9 othn availableSan DiegoCA 92104 23rd consecutive year covering continues go easier & last longer rest Congratulations Super Coverite September 1990 181 JET bust completely finished authentically detailed poseable 1/8 scale Al QC1Ir pruu209 2244170 II p0 box 5631fresno Ca 93755 II ond should conform outside shape tube brass aluminum tube can inserted plug smaller pieces tubing approximately 1/8 long inserted end form bearings wire prop shaft Use Loc-Tite similar product adhere inner pieces tubing outer tube Use CyA cyanoacrylate glue install completed bearing nose block Add plywood face least large external ball bearing wont crush balsa Use good spring such available through FAI Model Sup ply Dont use ball-point pen spring other cheap alternative might take set Make Z-bar out A6 music wire Use Sta-Brite equivalent hard solder Never trust soft solder hold propeller hub together First balance Z-bar alone attach blades balance again used make batch blades pairmatch according weight simi larity As recall averaged eight 10 grams try dont get confused about right- left-handed blades did winding hook shown plan works quite well rubber will stay cen tered unless Newton wrong dont understand winding hooks winding tubes stooges other aspects rubberpowered model technology buy Don Ross book Rubber Powered Model Airplanes AMA Supply Service catalog motor made up enough 34-in strands weigh 85 90 grams dry Consis tency whats wanted should no slack used size motor Mulvi hills nearly Old-Timer Rub ber models such Lanzo Stick Korda Dethermalizer may able everything thing did learn wind motor consistently Trying get used different motors dif ferent models can very stressful con test time Life John Wayne says movie Iwo Jima tough its tougher youre stupid Keep simple Choose motor get used Youll make fewer stupid mistakes under pressure competition Trimming balancing center-ofgravity shown plan best allaround thermal windy weather flying flying early morning still air CG could moved slightly aft decalage reduced model designed stability reliability rather absolute max imum performance Set SHOC stabilizer mount about /l6 tail cone making careful cuts Zona saw removing wood tween cuts create flat spot sup port mount should tilt slightly right making left tip about er right wing mount should have no inci dence relative motor tube deca lage established angle stabi lizer sitting aft block under its trail ing edge angle should two three degrees about / higher trailing edge Glue wing mount place mo tor loaded making sure balancing mark 6ver CG Use large table square set wing mount square motor tube key gluing /16 x A-in balsa strips bottom wing across chord wing goes same position time cant shift dur ing flight will happen its left un keyed Key nose block assembly fuse lage bit A-in ply needed LANDER INDUST 1005 19TH ST CT HAYRE MONTANA 59601 4062656529 BUILDING BOARD 30x48 $4895 ncf 24 X 66. $6395 inc frI CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surface bonded 3/4 laminated warp tree base straight true work surface will last years years CHECK EM ALL OUT English Lcitlicr CALENOAR GIRL CNALLENGE 19 AUG AC MODELER NW 503 646-4531 PORTLAND OR 26 AUG JOES HOBBY CTR 313 933-6567 DETROIT Ml 9/22/23 CENTRAL PENN 717 564-3280 HARRISBURG PA $2500 STARHAWK FUN FLY NEW STARHAWK BIPLANE NEW MISS STARHAWK POSTER See Starhawk Dealer details write Thorpe Engineering Corporation 1715 E Fairfield Mesa AZ 85203 Poster $500 P&H Prepaid 182 Model Aviation Airtronics powerful 94141 Mian Servo strongest servo its size ever produced Compactly designed Ito provide max imum torque space restrictive RC applica tions precision ball bearing 94141 well suited types ahtraft Compatible Airtronics radio systems 94141 ideal use sailplane flaps ailerons formula pylon air craft electric R/C alitraft rued 94141 servo utilizes metal output gear coupled durable metal molded gear train Its reinfoned case features unique side mounting brackets allow easy horizontal servo place ment inside aircraft wings information about Airteunics quality pmducts please call write address above 94141 Specifications Part Number 94141 Description Precision High Torque Ball Bearing Micro Servo Dimensions L 137 36mm W 060ISmm H 127 325mm Weight118 oz 33 grins Torque 45 oz/in 32 kg/cm Transit Time 025 seconds 600 rocacion Equipped splined stand ard size servo arm 94141 features ball bearing supported output shaft high quality coreless motor advanced electronic componentry No cornparably sized lightweight servo matches superior strength high torque powerful performance Airtronics 94141 I\hcro Servo SetThe Standani jAIRTRONICS INC Autry Irvine CA 92718714 830-8769 wood screw stop Dont omit screw will tear out balsa stop against screw nose plug place its blades folded either side motor tube determine best placement in spruce key locks nose block against rotation Zona saw cut away inner nose block ring key slot motor tube match photo will clarify operation Its im portant have two key points distri bute shock shaft striking screw prop has lot kinetic en ergy keys take quite load Its also good idea double motor tube covering material around key slots hooks seen photos proSMALL RIC HOBBY DEALERS! WE ARE DISTRIBUTOR KEYED TO YOUR PARTICULAR NEEDS information write call Southern Hobby Distributors 256 Madison Blvd Madison TN 37115 615 868-2100 1030 AM 500 PM CST peller blades made soft wire such paper clip Note location hooks somewhat aft hinge line blades folded rubberband hook goes over front Z-bar back other hook Change rubberbands before contest two reasons First its very important blades fold way back against mo tor tube stay way otherwise glide trim will thrown off Second rubberbands deteriorate very rapidly sun drafting triangle again using trusty worktable square check propeller blades track identical angle blade Also check static hAYALOISSRSSEOESASS DOGS X&.DIMS CONrAIl FUSE SIZE RECORDS MOM 97005 FATNDHASEOASSAMLM SHOE SOOTHEASTERN NE 19399AETELEHAS BEER ABE BOMBER AESOARIXSPETENRE vED LAER ER balance like Z-bar shown aluminum hub FAI Model Supply could substituted Cut small rudder tab about /a x 1 /2 trailing edge fin glue back place approximately /I6 left deflection small carpenters square check front end motor tube downthrust right thrust angles should about l should weigh about eight ounces ready fly 90 grams about three ounces contributed motor Oil propeller bearings lube motor youre ready fly Flight testing trim adjustment U3- Corter Rubber Band Powered He1icoper Flying repeatibillity coniStflt remult Flyn FOISWAI5D 5 gacewans nanEns TUESS CAM EBSI Fly IN TESTES HAD NO FEaTURES hPOHrrSApplitd BatS & Paper CENS$PEHIiON Setailed liSp ISep NStFOciiSflS 555tH pSPtS mE-COTinILLEM ASM AirIranse irreStly Sn FULL SIZE PLANS IS ISMS EESy ESSeFAIS / 7/ \T HhSlD 9O PD September 1990 183 Small Wonder ZAP UNIVERSITY COLLEGE OF GLUE KNOWLEDGE RONS MODEL Radio Controiled BUILDINGAirplanes Other Aircraft Boats 213 451-0414 ii Build Ry model should climb right turn glide left Glide controlled stabilizer tilt thickness aft incidence block Climb adjusted after satisfac tory glide trim has established Adjust climb small changes thrust line Thrust adjusted gently filing end motor tube change angle nose block rests very small increments Dont fly full power until youre completely satisfied models trim Make sure model climbs right turn avoid tendency loop hang prop power stall youre ready fly full power launch model about 450 angle tends go its pointed have flown few Conscientious Objectors just didnt want turn left glide ri diculous amount tilt stabilizer simply let turn right glide well climb Still unless really know what youre doing left glide right climb safe way go Dethermalizer accompanying photo dethermalizer shows its layout quite clearly guide tube under SHOC sta bilizer mount has multiple functions con ducts DT line keeps stabilizer rub bers touching line serves DT limit stop piece monofilament line can used DT line loop end fitted over peg top sta bilizer rubber must installed over loop stay place rubber loops over peg extends across leading edge stabilizer goes down around fuselage back up peg bit fuel tubing serves nicely DT line limit can tied line simple overhand knot adjusted strike line guide tube under SHOC mount tubing should adjusted allow about 450 stabilizer DT angle Tied other end DT line paper clip wire hook fuse rubberband extends hook across fuse around motor peg Use sharpened piece aluminum tubing drill holes fuselage makes cleaner hole does drill Use A-in tube fuse holder extending through both sides fuselage way can poke fuse material through piece wire can also pull out bit fuse case delay between lighting launching Glue tube firmly place heat sink can made alumi num can must selected care Ive used Coors Light cans cant say whether another brand would work well will gladly try answer questions might have about Conscientious Ob jector Send SASE 1902 Peter Pan St Norman OK 73072 responding advertisers mention read about Model Aviation Convert/McKinley Continued page 82 charge rather three some plan ning use small battery packs can aim think 20- 30-sec motor runs climb rates equal glow- ignition-powered models little no weight penalty Rally/Homer Continued page 88 forget did didnt fly AMA Rally Scobie Field Nor will other Houston modelers Bomber Field Club planning major event October Sev eral B-17s air simultaneously would something behold AMA Frequency Committee member George Steiner traveled Sacra mento CA teamed Bob Spivey Aus tin TX handle transmitter impound chores Charlie Marilyn Stevens Vance Dottie Wyman coordinated host local volunteers assist planning running event course rally would have possible efforts AMA HAMCI staff volunteers AMA Presi dent Don Lowe District VIH Vice Presi dent Gene Hempel AMA Executive Di rector Vince Mankowski hand Continued page 188 184 Model Aviation Caii Write 435 San Vicente Bivd J Santa Monica CA 90402 turn yoor printer lot oil plotter with.. FOILED AGAIN! C PLOT AIRFOILS IN ANY CIIORD u 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR 5HEETED WINGS ENTER DATA EASILY VIA INTELUGENT EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES 18-PAGE ILLUSTRATED U5ER MANUAL $45oo a cram prom slain ~2Z4i IiwflaihOO COopuV ira dot INI Clv conwaS potfli tWo w* irding ipioty 550 o 30 dOic Sm ram urocoy ordi CYGNET Software714 4966961 24843 Del Prado #141B Dana Point CA 92629 CAPACITIVE-DISCHARGE IGNITION SEA5 AMAN No moving parts No eng ne mod oat ons Basic unit $ 9995 Opposedcylinder twin $ 11995 ELECTRONIC CIRCUITRY REPLACES ANY MECHANICAL ADVANCE MAKES MAGNETO CONVERSIONS SNAPII
Edition: Model Aviation - 1990/09
Page Numbers: 74, 75, 76, 77, 180, 181, 182, 183, 184
Conscientious Objector Looking model can stand up rough-andtumble AMA Cate gory II Ill competitionand win robust rubber-powered Mul vihill good bet EBill Baker MOST MULVIHILL DESIGNS have published seem intended Category competition five-minute maxes judge relatively large fragile struc tures designed succeed events flown under AMA Category II III rules knew contests Id flying would involve windy weather small rough fields time Category II III rules would hold three- twominute flight times first three flights Conscientious Objector somewhat smaller typical Mulvihill design its also much less fragile model ca pable five minutes early morning air wont much good wing folds first windy flight gets beat shreds push five maxes just reach requirement five-minute max model competitive Id hoped will three minutes easily tactic fly early getting first three four flights before wind downdrafts strengthen try pick up some lift four- five-minute maxes Most competition will elim inated thensometimes can look back half-century model building Ive enjoyed being involved nearly facet hobby Ive flown CL RC mostly sport flier course have flown practically type Free Flight model known Most competition flying has Free Flight concentrating Gas events dropped out Free Flight about 1964 flew RC until 1976 Around time old Free Flight urge crept up again attended contest see what changed decided would fun learn new event like Rubber rather falling back old Gas groove happened long before Bob Dunham published Draft Dodger April 1975 issue Flying Models Id long awe Dunhams great-flying Rubber models Draft Dodger im mediately claimed interest Mass-produced Draft Dodger parts tum bled out workshop like Henry Ford cars point early process counted three wings five fuselages four stabs four props just keep two mod els flying competition surprise novice Rubber flier time models flew very well win ning contests 1979 started making few changes important rolled balsa tube fuselage did nothing im prove performance fuselage much less prone damage also rede signed wing mount modifications added up very practical Category Ill w model dubbed Conscientious Objec tor because wasnt exactly Draft Dodger anymore took both stock Draft Dodger newly evolved Conscientious Objector 1979 Nationals CO very high pitch prop giving longer slower climb contrast explosive power burst generated low-pitch prop Draft Dodger Wind conditions very strong blowing right across ocean corn two planes allowed event strat egy fly Draft Dodger first four flights knowing within three min utes would either corn OOS out-of-sight would likely lost fourth flight held Conscien tious Objector reserve fifthand hoped winningflight strategy worked though 74 Model Aviation Above The author showing off Conscientious Objector wheatfield near Norman OK No oil well background Isnt Bills probably wouldnt object owner bequeathed him Below authors iong-sufferlng hungry wife Paula holding up model show its lines promise lunch soon ordeal over Draft Dodger damaged after flight mostly wing mount damage diagonals broken out its explosive climb rate model flew through ground turbulence slower climbing Conscientious Ob jector wouldnt have able cope Still using tubular fuselage contin ued adapt Conscientious Objector un til virtually no remaining parts identi cal Draft Dodger guess difference between plagiarism research sources borrow adapted prop published years ago Frank Parmenter borrowed stabilizer structure Bob Whites Twin Fin also used simple Z-bar-type propeller hub copied wing mount few other ideas Jim OReilly invented better winding hook worked out sim ple reliable dethermalizer setup probably owes something lot differ ent people tried longer motor tubes va riety wings some area dif ferent dihedral schemes others differ ent airfoils experimented sev eral propellers model presented represents what judgment best compromise achieving key objective Mulvihill thats competitive Category III might want increase wing area 300 sq motor tube 42 model will serve flyoff five minute rounds Category may also want increase propeller diameter half-inch 95% Mulvihill flying done US model pre sented very competitive After 1979 AMA Nationals win Draft Dodger flew two Na tionals under Category III rules placed both third fifth time Conscientious Objector failed place Nats event surprise flown under Category rules As time went interests shifted Old-Timer events began attending SAM Champs instead AMA Nats Nevertheless continued well Conscientious Objector local re gional contests until found myself unable meet physical demands Free Flight competition present Im enjoying RC Sailplanes Conscientious Objector has permanent niche affections Id like think somewhere someone will flying Category III Mulvihill winning Construction motor tube fuselage houses mo tor also holds other parts air plane proper relationship another Though several fuselages built square cross section found tube config uration has best strength-to-weight ratio Use A6 x 4-in-wide 6- 8-lb A-grain balsa Make sure wood uniform density grain through entire length piece its much harder edge other transitions C-grain dont use Using metal straightedge trim sides true Seal wood side two coats Deft semigloss clear dope Sand gently between coats dry wet entire piece water will cause curl unpainted side expands Form wet balsa around 1 A-in-dia dowel after first scoring line down center dowel align balsa Largediameter dowels can procured hardware store lumber supply company believe theyre intended clothes closet hanging rods Jim OReilly once suggested using fluorescent tubes form motor tube Fearing would fall off ladder dur ing construction opted wood dowel Its also easier carve tail cone wood Ever try carving fluorescent tubing Wrap wood gently strips cloth gauze Ace bandage let dry Remove wood dowel apply Titebond along edges draw together Secure bits masking tape allow dry Make one-inch-wide nose doubler tail doubler about 1 wide simi larly prepared balsa doublers will Left Looking underside wing mount can see two lengths oil/a x 1A-in balsa used key wing pylon mount piece glued side wing pieces also serve fill gap between top pylon bottom undercambered wing Right Construction details wing mounting pylon side rails I/ x % spruce An easy way shape base pylon wrap sandpaper around motor tube sand pylon base perfect before final installation September 1990 75 Close-up view simple effective reliable dethermalizing mechanism motor peg tube fuse tube aluminum drink can heat sink can seen fuselage forward fin Small pieces %-in aluminum tubing serve guides limit line slip inside tube Glue place Titebond similar product sure let aft doubler protrude tube about youll have something glue tail onto tapered end forming dowel plane rasp easily form tail cone amount taper isnt crit ical 1 /4 narrowing 34 about right Make circular former hard -in balsa two cross-grained /16 pieces Fit former inside aft doubler end motor tube will prevent damage tapered cone should motor break Place another -in former area SHOC mount multifunction stabilizer mount attributed Sky Hoppers ange County California Dont worry rolled tube isnt per fectly circular Lay table allow roll until stops Let flat spot side top bottom 900 discernible curvature tube let concave side bottom joining tail cone eyeball closely can isnt perfect cone mount top forms straightest line motor tube motor pin must strong since tre mendous force exerted upon pin must course removable order change motors Use least A-in pin 1/2 SOFT BALSA WING TIP 9 SECTION DIHEDRAL BREAK RAISE T P 4 1/4 1 22I ZV LLI Ii 1/16 BAlSA SHEET 00155 DIGS 3/32OSIIRI S I/IA WIRESLIM ThBE RINK HOLE THIS LINE PARALLE 1/32PLYTO ESSE OF BLOCK PROP ERN n OCT COTTOM CC TOO TO MANO MRPOL SDOPE FRORT THIN TOrISOL CORNER TOIC4 TDICN AT HOC COIRT S THIRDSTOOL PROP BLADE CROSS SECTIONS NOT TO SCALE 3/32OIA3/5 015 HOLE HOLES /5 ALJMPJJM WINDING HOOK NOTE 3/64 TO 116 DOWN THRUST FOSELASE IS TJBE MADE BALSA SHEE 76 Model Aviation proplhub/nose block mechanism offset slot motor tube clearly seen offset makes impossible mount nose block upside down plastic press-on wheel collars attach blade Z-bar must leading edge theyll thrown off along blades creating lot noise very little thrust crashed airplane Another view prop/hub/nose block assembly showing doubled blade hinge assembly Zbar spring bearing motor hook Complete instructions carving blades nose block fashioning hub mechanism included text clearly detailed plan Finished aluminum hubs function just well can purchased through FAI Model Supply Wing jigs important especially mass-producing wings jig building wing shown plan background foreground jig polyhedral variant prop/hub/nose block assembly attached motor tube Note blades fold flush against tube its important fold way back against shown stay way during glide Otherwise glide trim will thrown off Full-Size Plans Available. See Page 196 I/IA I/A HALSA WEBS 1/B BALSA SPAR NO DIHEDRAL BREAK AT CENTER LINE WIN~ PlAN I4 SO BALSA LEADING EDGE DIHEDRAL BREAK RAISE WING TIP 4-1/4 imi~ _[-t___ OUBL TOP 0 3 -- F AR BALSA 29 OF UK BALSA GA HESHEAR WEE AT DIHEDRAL JO/AT LEL I/H HARD BALSA_ IM OP I/3D LEDIHEDRAL WING RIB PATTERN BRACEAIRFOIL IS DUNHAM-BARER- REEHOK 00KGOLDBERG PASTIC IDE OFZ AGR AS THE WHEEL OLLAR FAI MODEL SUPPLY RGLL TEREARING AND SPRINO 3D PLO NCE WREI/IA ID TUBE GAVB SPRUCE KES HEW WITH EMOVED NOSE/PROP DETAILI/IA BALSA SHEET S/A UPRJCE I/RBALSATF-I B F-B SHEET___________ F-234 aUNT WINS INCIDENCE 0 ICALE Ir\IIilIIIIITi~ F-I FOED CUFHF5 I/B 3/IA SPRCE RAILS / FUSELAGE SIDE VIEW I/H GO BALSA DOG BLER I/A BALSA SHEET GUSSETS /H SG RGLSA LE I/H SO EALSA DOUBLER I/A RALSA4 \JL/ N SHEET TP END IEW I/H BALSA SHEET RIBS AT DIHEDRAL BREAK 1/ H PLY I/IA BALSA VIA BALSA SHEET/64 PLO I/3D HALSA SHEET SHEAR WEBS STAB STAB DIAGONAL I/IA BA3A SHEET PROP BEARING DETAIL NO SCALE TWO I/H HALSA SHEETS CROSS URANED ALUM SODA CAN HEAT SINE BOTH I/A DIASIDES MOTOR PIN NOTE COMPLETE MODEL RTF WITH MOTOR THEN GLUE WING MOANT ON WITH ARKED ON WING MOUNT OVER ACTUAL C S I/B I/IA BALSA SPARS TOP AND BOTTOM STABILIZER VIE BALSA RIBS /8 50 BASA- TRANS EDGE I/IA HASA DI AS ON ALS I/H BALSA SHEET 1/4 BALSA INCIDENCE BLOCK-TRIM FOR RUDGER TAB -DD TO -3 INCID I/A EFT I/lA PLY SHOC MOUNT 1/H ALUM TUBE CRIMP ALUM TUBE 1/4 BALSA I/H BALSA I/ADD ALUM TUBE THRA FUSELAGE /16 BALSA SHEET DOURLER PAPER CLIPCRIMP ALUMTRACING BY OE DEMARCO HOOKTUBE MODEL ATION CONSCIENTIOUS OBJECTOR DESIGNED BY BILL BAKER reinforce tube holes made fin can made %-in light sheet balsa save weight cant find four- six-pound sheet built-up fin could used course would prone battle damage install fin lay tube its side flat table Block up fin books pieces wood its centered tube parallel table glue place As long fin parallel direction flight symmetry tail cone critical Ron Robertti once told tail aint straight retorted thing needs turn anyway Covering fuselage cover tubes tissue sometimes silk Ive also used polyester cloth intended dress making Its very tough comes pretty colors wrinkles can elimi nated through heat shrinking down side its little heavier other materi als next tube Id like try O6-oz fiberglass cloth clear dope adhe sive dont usually cover tail cones fins would use tissue did un covered areas including prop usu ally finished Deft semigloss wood filler/sealer available hardware store stabilizer quite conventional Its also lightweight trouble-free Note both leading trailing edges made A-in-sq stock Round off leading edge put slight taper trailing edge Beauty second ary lightweight warp-free construc tion model flying speeds slow wide sharply tapered trailing edge would simply excess weight Hence truncated trailing edges used both stabilizer wing Note point needed con nect both DT dethermalizer limit line front stab hold-down rubber Also note absence need sheet fill September 1990 77 Continued page 180 Three Mulvihill standouts author Bill Baker left George Perryman center Jim OReilly placed first second third both 1979 1982 AMA Nats ALL STAINLESS STEEL HEAD LITE IItm BEST GLOW PLUG CONNECTOR Stainless Steel HEAD LOCK BEST DESIGNAll Welded No Solder Acid Flux Flexing Wires BEST NiCadField Replaceable 12 AH SANYO 15 AH PANASONIC BEST QUALITY & GUARANTEE MODEL PRODUCTS CORPORATION BEST PRICESt #045-WIO NiCad Charger$ 995 available write directSt #040-With NiCad$ 1595 add $100 $200 outside US St #041-With NiCad & Charger $ 2595 MODEL PRODUCTS CORP RO Box 100 Allamuchy NJ 07820201850-1508 have coloring model planes using method years Unlike Floquil butyrate-jar skimming inexpensive food markets fabric outlets sell Rit dyethe powdered kind comes infinite variety colors can used straight blended just right color use baby food jars mixing Open pouch Rh dye pour few beads jar pour some dope thinner acetone top will surprised quickly thin ner snatches color dye Keep blending using raw balsa sticks test against color sam ple want match Once satisfied add about 20% clear dope mix always put couple thin coats clear dope model first prevent creeping Rit will give lively-looking color saving little jar will allow patching later Just add thinnerthere no pigment Work takes longer tell about FF Scale/Warner Continued page 73 Investigation problem turned up fact Federal Standard screwed up 1964 changed color standard original WW II olive drab new kept old number F534087 confuse modelers restorers make things worse Uncle Sam gave same number very dark brown olive drab March 1979 meant modelers three FS34087s choose January 1984 34087 reappeared original shade gloss semigloss versions OD dark brown version 1979 14087 24087 June 1984 GSA decided straight en things out issued change notice ef fect color chip 34087 dated March 1979 wrong color shall used colors 14087 24087 34087 represent two different colors lors have re numbered follows 14087 now 14084 24087 now 24084 34087 now 34088 makes five matte olive drabs pre-1964 34087 post-1964 34087 March 1979 34087 wrong color 1984 34087 1984 Change Notice 34088 same color later 34087 new FS595B being printed riht now should take care confusion right Dont count Don suggests build Navy aircraft forget about olive drab alto gether case its nice see company concerned about getting right Perhaps thats cause Don perfectionist kind person would balance wheel wheelbarrow Czech submarine contest high points life getting news what other modelers doing Id like share Lubomir Koutnys account contest Czechoslovakia likes drought-ridden Califor nians long Boys Zabreh north Moravia began arrange A0-scale contest little town did very well am sorry weather perfect submarine contest rain damp air very well Scale big perfect varnish like Straniks twin Batman won Other boys give Scales over hot car engine before next flight get idea guess spoiled re member flying guys southern France flew rain shine often packed model boxes cars after sunset Plastic vs rubber have hearing nasty rumors late rubber stored plastic con tainers may deteriorating accelerated rate might due outgassing plastic container have rubber stored type container length time under optimal conditions airtight out heat might want check out let know harm seems have done Im sure other readers would really happy know whether good way store precious rubber motors Well until next time guys gals always re member Dont dope models sandstorms things wont too rough Conscientious/Baker Continued page 77 stab lightweight aligns itseli small notch DT line tht trailing edge action SHOC-typt stab front mount centers leading edgc well enough negating need keying An added advantage system thaI its free move meeting obstruc Man turer Hi Performa utba$Is andraft CULPEPPER C MODELS INC 2526 Washington DubuqmIA 520411 31015834830 180 Model Aviation PRODUCTS FOR THE O4SCERNING MODELER FF Duration/Linstrum Continued page 71 Made America American Technology RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Fot-ster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Coil wrte free information RJL Industries PO Box 5 Sierra Mack-e CA 91025 818 359-0016 Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanshin & Perfomance Serious Horsepower3 0S ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shade Performance Specialties Send $1 00for fully illustrated catalog Available VS Long & Short Stroke 06 Long Stroke 06 6IFSR 06 40 VRP/VF 06 91 VRDF STX-40 Rossi 40 coming soon mare information Call 619 729-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 tion would break keyed stabilizer notched peg holds rubber DT line can made A6 ply popsi cle stick tongue blade wood dowel aluminum tubing peg mounting platform stabilizer should also /~ ply peg must able withstand certain amount strain Wing heavy-duty spar shown plans Ive never broken wing Maybe spar too heavy like up per main spar can made either very hard balsa spruce other spars can medium 8-10-lb balsa shear webbing between spars very important Installing pieces along centers spars shown plan ideal find making full depth locating along side easier adequate -in hard balsa angled center dihedral brace can also made full depth Shim up rib fronts A2 above leading edge small taper cut can made will shape leading edge conform undercambered ribs Shim up rear end ribs trailing edge A2 same reason wing can built jig youre going build several wings jig highly recommended jig used airplane allowed wing built piece except lower spar added air later use jigs dates discovery warps plagued induced during process adding dihedral dont usually shim washout since about washout seems occur auto matically tissue doped wing mount motor tube de signed lightweight rigid platform wing rest quick way achieve perfect fit wrap piece sandpaper around tube lightly sand mount base shape Dont glue wing mount fuselage until model ready fly must adjusted achieve correct CG center-of-gravity After mount glued place make sure theres enough stabilizer tilt produce left turn Propeller may try write detailed arti cle propeller carving soon sub ject has covered thoroughly else Wood selection primary impor tance block should hard about 14 lb uniform density produce blades both thin strong Lay out top bottom profiles making sure centerline top profile parallel edge block same bottom line side profile Set block drill press drill hole hinge Cut out profiles band saw Carve bottom blades first com pletely finishing before starting top sure keep track right left blades once carved six left-handed blades before realized what doing Thank fully wife saved day suggesting carve six right-handed blades Try about /16 undercamber midblade progressing no undercamber tip Begin carving top blade get ting down about A-in thickness Make high point airfoil its helpful mark about one-third chord Take time Carve thin slices chunks Shape blade aft high point sort triangular profile start final shaping leading one-third high point thickest part blade should about /16 tip midblade Add A4 A2 ply doublers /32 OD tubing hinge Place blade Z-bar hub drill holes limiting pins A6 drill mounted pin vice Take extreme care drilling holes blades track properly sight turning blades pro file should perfect alignment other Finish propeller Deft equivalent cant find Deft local hardware store Ive noticed listed Lee Campbells catalog nose plug made A-in sheet balsa laminated cross-grained first lam mate fits inside motor tube sec Electric Flight f Controller Perfect 05 Motors 510 cells 2mooth Has Brake Lightweight 12 Adjastobte switching pointssoney hock Soldertess tenssisot ror easy hookup guarantee ON/OFF Controller $2495 Power save weight very high efficiency ossty O06V loss 77 22x13x63 Colifoneejo residents add 65% $163 Tax Add $100 foe shipping Send Check money order wessaitiHigh Sky Futaha cossoetoc Kansas St #9 othn availableSan DiegoCA 92104 23rd consecutive year covering continues go easier & last longer rest Congratulations Super Coverite September 1990 181 JET bust completely finished authentically detailed poseable 1/8 scale Al QC1Ir pruu209 2244170 II p0 box 5631fresno Ca 93755 II ond should conform outside shape tube brass aluminum tube can inserted plug smaller pieces tubing approximately 1/8 long inserted end form bearings wire prop shaft Use Loc-Tite similar product adhere inner pieces tubing outer tube Use CyA cyanoacrylate glue install completed bearing nose block Add plywood face least large external ball bearing wont crush balsa Use good spring such available through FAI Model Sup ply Dont use ball-point pen spring other cheap alternative might take set Make Z-bar out A6 music wire Use Sta-Brite equivalent hard solder Never trust soft solder hold propeller hub together First balance Z-bar alone attach blades balance again used make batch blades pairmatch according weight simi larity As recall averaged eight 10 grams try dont get confused about right- left-handed blades did winding hook shown plan works quite well rubber will stay cen tered unless Newton wrong dont understand winding hooks winding tubes stooges other aspects rubberpowered model technology buy Don Ross book Rubber Powered Model Airplanes AMA Supply Service catalog motor made up enough 34-in strands weigh 85 90 grams dry Consis tency whats wanted should no slack used size motor Mulvi hills nearly Old-Timer Rub ber models such Lanzo Stick Korda Dethermalizer may able everything thing did learn wind motor consistently Trying get used different motors dif ferent models can very stressful con test time Life John Wayne says movie Iwo Jima tough its tougher youre stupid Keep simple Choose motor get used Youll make fewer stupid mistakes under pressure competition Trimming balancing center-ofgravity shown plan best allaround thermal windy weather flying flying early morning still air CG could moved slightly aft decalage reduced model designed stability reliability rather absolute max imum performance Set SHOC stabilizer mount about /l6 tail cone making careful cuts Zona saw removing wood tween cuts create flat spot sup port mount should tilt slightly right making left tip about er right wing mount should have no inci dence relative motor tube deca lage established angle stabi lizer sitting aft block under its trail ing edge angle should two three degrees about / higher trailing edge Glue wing mount place mo tor loaded making sure balancing mark 6ver CG Use large table square set wing mount square motor tube key gluing /16 x A-in balsa strips bottom wing across chord wing goes same position time cant shift dur ing flight will happen its left un keyed Key nose block assembly fuse lage bit A-in ply needed LANDER INDUST 1005 19TH ST CT HAYRE MONTANA 59601 4062656529 BUILDING BOARD 30x48 $4895 ncf 24 X 66. $6395 inc frI CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surface bonded 3/4 laminated warp tree base straight true work surface will last years years CHECK EM ALL OUT English Lcitlicr CALENOAR GIRL CNALLENGE 19 AUG AC MODELER NW 503 646-4531 PORTLAND OR 26 AUG JOES HOBBY CTR 313 933-6567 DETROIT Ml 9/22/23 CENTRAL PENN 717 564-3280 HARRISBURG PA $2500 STARHAWK FUN FLY NEW STARHAWK BIPLANE NEW MISS STARHAWK POSTER See Starhawk Dealer details write Thorpe Engineering Corporation 1715 E Fairfield Mesa AZ 85203 Poster $500 P&H Prepaid 182 Model Aviation Airtronics powerful 94141 Mian Servo strongest servo its size ever produced Compactly designed Ito provide max imum torque space restrictive RC applica tions precision ball bearing 94141 well suited types ahtraft Compatible Airtronics radio systems 94141 ideal use sailplane flaps ailerons formula pylon air craft electric R/C alitraft rued 94141 servo utilizes metal output gear coupled durable metal molded gear train Its reinfoned case features unique side mounting brackets allow easy horizontal servo place ment inside aircraft wings information about Airteunics quality pmducts please call write address above 94141 Specifications Part Number 94141 Description Precision High Torque Ball Bearing Micro Servo Dimensions L 137 36mm W 060ISmm H 127 325mm Weight118 oz 33 grins Torque 45 oz/in 32 kg/cm Transit Time 025 seconds 600 rocacion Equipped splined stand ard size servo arm 94141 features ball bearing supported output shaft high quality coreless motor advanced electronic componentry No cornparably sized lightweight servo matches superior strength high torque powerful performance Airtronics 94141 I\hcro Servo SetThe Standani jAIRTRONICS INC Autry Irvine CA 92718714 830-8769 wood screw stop Dont omit screw will tear out balsa stop against screw nose plug place its blades folded either side motor tube determine best placement in spruce key locks nose block against rotation Zona saw cut away inner nose block ring key slot motor tube match photo will clarify operation Its im portant have two key points distri bute shock shaft striking screw prop has lot kinetic en ergy keys take quite load Its also good idea double motor tube covering material around key slots hooks seen photos proSMALL RIC HOBBY DEALERS! WE ARE DISTRIBUTOR KEYED TO YOUR PARTICULAR NEEDS information write call Southern Hobby Distributors 256 Madison Blvd Madison TN 37115 615 868-2100 1030 AM 500 PM CST peller blades made soft wire such paper clip Note location hooks somewhat aft hinge line blades folded rubberband hook goes over front Z-bar back other hook Change rubberbands before contest two reasons First its very important blades fold way back against mo tor tube stay way otherwise glide trim will thrown off Second rubberbands deteriorate very rapidly sun drafting triangle again using trusty worktable square check propeller blades track identical angle blade Also check static hAYALOISSRSSEOESASS DOGS X&.DIMS CONrAIl FUSE SIZE RECORDS MOM 97005 FATNDHASEOASSAMLM SHOE SOOTHEASTERN NE 19399AETELEHAS BEER ABE BOMBER AESOARIXSPETENRE vED LAER ER balance like Z-bar shown aluminum hub FAI Model Supply could substituted Cut small rudder tab about /a x 1 /2 trailing edge fin glue back place approximately /I6 left deflection small carpenters square check front end motor tube downthrust right thrust angles should about l should weigh about eight ounces ready fly 90 grams about three ounces contributed motor Oil propeller bearings lube motor youre ready fly Flight testing trim adjustment U3- Corter Rubber Band Powered He1icoper Flying repeatibillity coniStflt remult Flyn FOISWAI5D 5 gacewans nanEns TUESS CAM EBSI Fly IN TESTES HAD NO FEaTURES hPOHrrSApplitd BatS & Paper CENS$PEHIiON Setailed liSp ISep NStFOciiSflS 555tH pSPtS mE-COTinILLEM ASM AirIranse irreStly Sn FULL SIZE PLANS IS ISMS EESy ESSeFAIS / 7/ \T HhSlD 9O PD September 1990 183 Small Wonder ZAP UNIVERSITY COLLEGE OF GLUE KNOWLEDGE RONS MODEL Radio Controiled BUILDINGAirplanes Other Aircraft Boats 213 451-0414 ii Build Ry model should climb right turn glide left Glide controlled stabilizer tilt thickness aft incidence block Climb adjusted after satisfac tory glide trim has established Adjust climb small changes thrust line Thrust adjusted gently filing end motor tube change angle nose block rests very small increments Dont fly full power until youre completely satisfied models trim Make sure model climbs right turn avoid tendency loop hang prop power stall youre ready fly full power launch model about 450 angle tends go its pointed have flown few Conscientious Objectors just didnt want turn left glide ri diculous amount tilt stabilizer simply let turn right glide well climb Still unless really know what youre doing left glide right climb safe way go Dethermalizer accompanying photo dethermalizer shows its layout quite clearly guide tube under SHOC sta bilizer mount has multiple functions con ducts DT line keeps stabilizer rub bers touching line serves DT limit stop piece monofilament line can used DT line loop end fitted over peg top sta bilizer rubber must installed over loop stay place rubber loops over peg extends across leading edge stabilizer goes down around fuselage back up peg bit fuel tubing serves nicely DT line limit can tied line simple overhand knot adjusted strike line guide tube under SHOC mount tubing should adjusted allow about 450 stabilizer DT angle Tied other end DT line paper clip wire hook fuse rubberband extends hook across fuse around motor peg Use sharpened piece aluminum tubing drill holes fuselage makes cleaner hole does drill Use A-in tube fuse holder extending through both sides fuselage way can poke fuse material through piece wire can also pull out bit fuse case delay between lighting launching Glue tube firmly place heat sink can made alumi num can must selected care Ive used Coors Light cans cant say whether another brand would work well will gladly try answer questions might have about Conscientious Ob jector Send SASE 1902 Peter Pan St Norman OK 73072 responding advertisers mention read about Model Aviation Convert/McKinley Continued page 82 charge rather three some plan ning use small battery packs can aim think 20- 30-sec motor runs climb rates equal glow- ignition-powered models little no weight penalty Rally/Homer Continued page 88 forget did didnt fly AMA Rally Scobie Field Nor will other Houston modelers Bomber Field Club planning major event October Sev eral B-17s air simultaneously would something behold AMA Frequency Committee member George Steiner traveled Sacra mento CA teamed Bob Spivey Aus tin TX handle transmitter impound chores Charlie Marilyn Stevens Vance Dottie Wyman coordinated host local volunteers assist planning running event course rally would have possible efforts AMA HAMCI staff volunteers AMA Presi dent Don Lowe District VIH Vice Presi dent Gene Hempel AMA Executive Di rector Vince Mankowski hand Continued page 188 184 Model Aviation Caii Write 435 San Vicente Bivd J Santa Monica CA 90402 turn yoor printer lot oil plotter with.. FOILED AGAIN! C PLOT AIRFOILS IN ANY CIIORD u 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR 5HEETED WINGS ENTER DATA EASILY VIA INTELUGENT EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES 18-PAGE ILLUSTRATED U5ER MANUAL $45oo a cram prom slain ~2Z4i IiwflaihOO COopuV ira dot INI Clv conwaS potfli tWo w* irding ipioty 550 o 30 dOic Sm ram urocoy ordi CYGNET Software714 4966961 24843 Del Prado #141B Dana Point CA 92629 CAPACITIVE-DISCHARGE IGNITION SEA5 AMAN No moving parts No eng ne mod oat ons Basic unit $ 9995 Opposedcylinder twin $ 11995 ELECTRONIC CIRCUITRY REPLACES ANY MECHANICAL ADVANCE MAKES MAGNETO CONVERSIONS SNAPII
Edition: Model Aviation - 1990/09
Page Numbers: 74, 75, 76, 77, 180, 181, 182, 183, 184
Conscientious Objector Looking model can stand up rough-andtumble AMA Cate gory II Ill competitionand win robust rubber-powered Mul vihill good bet EBill Baker MOST MULVIHILL DESIGNS have published seem intended Category competition five-minute maxes judge relatively large fragile struc tures designed succeed events flown under AMA Category II III rules knew contests Id flying would involve windy weather small rough fields time Category II III rules would hold three- twominute flight times first three flights Conscientious Objector somewhat smaller typical Mulvihill design its also much less fragile model ca pable five minutes early morning air wont much good wing folds first windy flight gets beat shreds push five maxes just reach requirement five-minute max model competitive Id hoped will three minutes easily tactic fly early getting first three four flights before wind downdrafts strengthen try pick up some lift four- five-minute maxes Most competition will elim inated thensometimes can look back half-century model building Ive enjoyed being involved nearly facet hobby Ive flown CL RC mostly sport flier course have flown practically type Free Flight model known Most competition flying has Free Flight concentrating Gas events dropped out Free Flight about 1964 flew RC until 1976 Around time old Free Flight urge crept up again attended contest see what changed decided would fun learn new event like Rubber rather falling back old Gas groove happened long before Bob Dunham published Draft Dodger April 1975 issue Flying Models Id long awe Dunhams great-flying Rubber models Draft Dodger im mediately claimed interest Mass-produced Draft Dodger parts tum bled out workshop like Henry Ford cars point early process counted three wings five fuselages four stabs four props just keep two mod els flying competition surprise novice Rubber flier time models flew very well win ning contests 1979 started making few changes important rolled balsa tube fuselage did nothing im prove performance fuselage much less prone damage also rede signed wing mount modifications added up very practical Category Ill w model dubbed Conscientious Objec tor because wasnt exactly Draft Dodger anymore took both stock Draft Dodger newly evolved Conscientious Objector 1979 Nationals CO very high pitch prop giving longer slower climb contrast explosive power burst generated low-pitch prop Draft Dodger Wind conditions very strong blowing right across ocean corn two planes allowed event strat egy fly Draft Dodger first four flights knowing within three min utes would either corn OOS out-of-sight would likely lost fourth flight held Conscien tious Objector reserve fifthand hoped winningflight strategy worked though 74 Model Aviation Above The author showing off Conscientious Objector wheatfield near Norman OK No oil well background Isnt Bills probably wouldnt object owner bequeathed him Below authors iong-sufferlng hungry wife Paula holding up model show its lines promise lunch soon ordeal over Draft Dodger damaged after flight mostly wing mount damage diagonals broken out its explosive climb rate model flew through ground turbulence slower climbing Conscientious Ob jector wouldnt have able cope Still using tubular fuselage contin ued adapt Conscientious Objector un til virtually no remaining parts identi cal Draft Dodger guess difference between plagiarism research sources borrow adapted prop published years ago Frank Parmenter borrowed stabilizer structure Bob Whites Twin Fin also used simple Z-bar-type propeller hub copied wing mount few other ideas Jim OReilly invented better winding hook worked out sim ple reliable dethermalizer setup probably owes something lot differ ent people tried longer motor tubes va riety wings some area dif ferent dihedral schemes others differ ent airfoils experimented sev eral propellers model presented represents what judgment best compromise achieving key objective Mulvihill thats competitive Category III might want increase wing area 300 sq motor tube 42 model will serve flyoff five minute rounds Category may also want increase propeller diameter half-inch 95% Mulvihill flying done US model pre sented very competitive After 1979 AMA Nationals win Draft Dodger flew two Na tionals under Category III rules placed both third fifth time Conscientious Objector failed place Nats event surprise flown under Category rules As time went interests shifted Old-Timer events began attending SAM Champs instead AMA Nats Nevertheless continued well Conscientious Objector local re gional contests until found myself unable meet physical demands Free Flight competition present Im enjoying RC Sailplanes Conscientious Objector has permanent niche affections Id like think somewhere someone will flying Category III Mulvihill winning Construction motor tube fuselage houses mo tor also holds other parts air plane proper relationship another Though several fuselages built square cross section found tube config uration has best strength-to-weight ratio Use A6 x 4-in-wide 6- 8-lb A-grain balsa Make sure wood uniform density grain through entire length piece its much harder edge other transitions C-grain dont use Using metal straightedge trim sides true Seal wood side two coats Deft semigloss clear dope Sand gently between coats dry wet entire piece water will cause curl unpainted side expands Form wet balsa around 1 A-in-dia dowel after first scoring line down center dowel align balsa Largediameter dowels can procured hardware store lumber supply company believe theyre intended clothes closet hanging rods Jim OReilly once suggested using fluorescent tubes form motor tube Fearing would fall off ladder dur ing construction opted wood dowel Its also easier carve tail cone wood Ever try carving fluorescent tubing Wrap wood gently strips cloth gauze Ace bandage let dry Remove wood dowel apply Titebond along edges draw together Secure bits masking tape allow dry Make one-inch-wide nose doubler tail doubler about 1 wide simi larly prepared balsa doublers will Left Looking underside wing mount can see two lengths oil/a x 1A-in balsa used key wing pylon mount piece glued side wing pieces also serve fill gap between top pylon bottom undercambered wing Right Construction details wing mounting pylon side rails I/ x % spruce An easy way shape base pylon wrap sandpaper around motor tube sand pylon base perfect before final installation September 1990 75 Close-up view simple effective reliable dethermalizing mechanism motor peg tube fuse tube aluminum drink can heat sink can seen fuselage forward fin Small pieces %-in aluminum tubing serve guides limit line slip inside tube Glue place Titebond similar product sure let aft doubler protrude tube about youll have something glue tail onto tapered end forming dowel plane rasp easily form tail cone amount taper isnt crit ical 1 /4 narrowing 34 about right Make circular former hard -in balsa two cross-grained /16 pieces Fit former inside aft doubler end motor tube will prevent damage tapered cone should motor break Place another -in former area SHOC mount multifunction stabilizer mount attributed Sky Hoppers ange County California Dont worry rolled tube isnt per fectly circular Lay table allow roll until stops Let flat spot side top bottom 900 discernible curvature tube let concave side bottom joining tail cone eyeball closely can isnt perfect cone mount top forms straightest line motor tube motor pin must strong since tre mendous force exerted upon pin must course removable order change motors Use least A-in pin 1/2 SOFT BALSA WING TIP 9 SECTION DIHEDRAL BREAK RAISE T P 4 1/4 1 22I ZV LLI Ii 1/16 BAlSA SHEET 00155 DIGS 3/32OSIIRI S I/IA WIRESLIM ThBE RINK HOLE THIS LINE PARALLE 1/32PLYTO ESSE OF BLOCK PROP ERN n OCT COTTOM CC TOO TO MANO MRPOL SDOPE FRORT THIN TOrISOL CORNER TOIC4 TDICN AT HOC COIRT S THIRDSTOOL PROP BLADE CROSS SECTIONS NOT TO SCALE 3/32OIA3/5 015 HOLE HOLES /5 ALJMPJJM WINDING HOOK NOTE 3/64 TO 116 DOWN THRUST FOSELASE IS TJBE MADE BALSA SHEE 76 Model Aviation proplhub/nose block mechanism offset slot motor tube clearly seen offset makes impossible mount nose block upside down plastic press-on wheel collars attach blade Z-bar must leading edge theyll thrown off along blades creating lot noise very little thrust crashed airplane Another view prop/hub/nose block assembly showing doubled blade hinge assembly Zbar spring bearing motor hook Complete instructions carving blades nose block fashioning hub mechanism included text clearly detailed plan Finished aluminum hubs function just well can purchased through FAI Model Supply Wing jigs important especially mass-producing wings jig building wing shown plan background foreground jig polyhedral variant prop/hub/nose block assembly attached motor tube Note blades fold flush against tube its important fold way back against shown stay way during glide Otherwise glide trim will thrown off Full-Size Plans Available. See Page 196 I/IA I/A HALSA WEBS 1/B BALSA SPAR NO DIHEDRAL BREAK AT CENTER LINE WIN~ PlAN I4 SO BALSA LEADING EDGE DIHEDRAL BREAK RAISE WING TIP 4-1/4 imi~ _[-t___ OUBL TOP 0 3 -- F AR BALSA 29 OF UK BALSA GA HESHEAR WEE AT DIHEDRAL JO/AT LEL I/H HARD BALSA_ IM OP I/3D LEDIHEDRAL WING RIB PATTERN BRACEAIRFOIL IS DUNHAM-BARER- REEHOK 00KGOLDBERG PASTIC IDE OFZ AGR AS THE WHEEL OLLAR FAI MODEL SUPPLY RGLL TEREARING AND SPRINO 3D PLO NCE WREI/IA ID TUBE GAVB SPRUCE KES HEW WITH EMOVED NOSE/PROP DETAILI/IA BALSA SHEET S/A UPRJCE I/RBALSATF-I B F-B SHEET___________ F-234 aUNT WINS INCIDENCE 0 ICALE Ir\IIilIIIIITi~ F-I FOED CUFHF5 I/B 3/IA SPRCE RAILS / FUSELAGE SIDE VIEW I/H GO BALSA DOG BLER I/A BALSA SHEET GUSSETS /H SG RGLSA LE I/H SO EALSA DOUBLER I/A RALSA4 \JL/ N SHEET TP END IEW I/H BALSA SHEET RIBS AT DIHEDRAL BREAK 1/ H PLY I/IA BALSA VIA BALSA SHEET/64 PLO I/3D HALSA SHEET SHEAR WEBS STAB STAB DIAGONAL I/IA BA3A SHEET PROP BEARING DETAIL NO SCALE TWO I/H HALSA SHEETS CROSS URANED ALUM SODA CAN HEAT SINE BOTH I/A DIASIDES MOTOR PIN NOTE COMPLETE MODEL RTF WITH MOTOR THEN GLUE WING MOANT ON WITH ARKED ON WING MOUNT OVER ACTUAL C S I/B I/IA BALSA SPARS TOP AND BOTTOM STABILIZER VIE BALSA RIBS /8 50 BASA- TRANS EDGE I/IA HASA DI AS ON ALS I/H BALSA SHEET 1/4 BALSA INCIDENCE BLOCK-TRIM FOR RUDGER TAB -DD TO -3 INCID I/A EFT I/lA PLY SHOC MOUNT 1/H ALUM TUBE CRIMP ALUM TUBE 1/4 BALSA I/H BALSA I/ADD ALUM TUBE THRA FUSELAGE /16 BALSA SHEET DOURLER PAPER CLIPCRIMP ALUMTRACING BY OE DEMARCO HOOKTUBE MODEL ATION CONSCIENTIOUS OBJECTOR DESIGNED BY BILL BAKER reinforce tube holes made fin can made %-in light sheet balsa save weight cant find four- six-pound sheet built-up fin could used course would prone battle damage install fin lay tube its side flat table Block up fin books pieces wood its centered tube parallel table glue place As long fin parallel direction flight symmetry tail cone critical Ron Robertti once told tail aint straight retorted thing needs turn anyway Covering fuselage cover tubes tissue sometimes silk Ive also used polyester cloth intended dress making Its very tough comes pretty colors wrinkles can elimi nated through heat shrinking down side its little heavier other materi als next tube Id like try O6-oz fiberglass cloth clear dope adhe sive dont usually cover tail cones fins would use tissue did un covered areas including prop usu ally finished Deft semigloss wood filler/sealer available hardware store stabilizer quite conventional Its also lightweight trouble-free Note both leading trailing edges made A-in-sq stock Round off leading edge put slight taper trailing edge Beauty second ary lightweight warp-free construc tion model flying speeds slow wide sharply tapered trailing edge would simply excess weight Hence truncated trailing edges used both stabilizer wing Note point needed con nect both DT dethermalizer limit line front stab hold-down rubber Also note absence need sheet fill September 1990 77 Continued page 180 Three Mulvihill standouts author Bill Baker left George Perryman center Jim OReilly placed first second third both 1979 1982 AMA Nats ALL STAINLESS STEEL HEAD LITE IItm BEST GLOW PLUG CONNECTOR Stainless Steel HEAD LOCK BEST DESIGNAll Welded No Solder Acid Flux Flexing Wires BEST NiCadField Replaceable 12 AH SANYO 15 AH PANASONIC BEST QUALITY & GUARANTEE MODEL PRODUCTS CORPORATION BEST PRICESt #045-WIO NiCad Charger$ 995 available write directSt #040-With NiCad$ 1595 add $100 $200 outside US St #041-With NiCad & Charger $ 2595 MODEL PRODUCTS CORP RO Box 100 Allamuchy NJ 07820201850-1508 have coloring model planes using method years Unlike Floquil butyrate-jar skimming inexpensive food markets fabric outlets sell Rit dyethe powdered kind comes infinite variety colors can used straight blended just right color use baby food jars mixing Open pouch Rh dye pour few beads jar pour some dope thinner acetone top will surprised quickly thin ner snatches color dye Keep blending using raw balsa sticks test against color sam ple want match Once satisfied add about 20% clear dope mix always put couple thin coats clear dope model first prevent creeping Rit will give lively-looking color saving little jar will allow patching later Just add thinnerthere no pigment Work takes longer tell about FF Scale/Warner Continued page 73 Investigation problem turned up fact Federal Standard screwed up 1964 changed color standard original WW II olive drab new kept old number F534087 confuse modelers restorers make things worse Uncle Sam gave same number very dark brown olive drab March 1979 meant modelers three FS34087s choose January 1984 34087 reappeared original shade gloss semigloss versions OD dark brown version 1979 14087 24087 June 1984 GSA decided straight en things out issued change notice ef fect color chip 34087 dated March 1979 wrong color shall used colors 14087 24087 34087 represent two different colors lors have re numbered follows 14087 now 14084 24087 now 24084 34087 now 34088 makes five matte olive drabs pre-1964 34087 post-1964 34087 March 1979 34087 wrong color 1984 34087 1984 Change Notice 34088 same color later 34087 new FS595B being printed riht now should take care confusion right Dont count Don suggests build Navy aircraft forget about olive drab alto gether case its nice see company concerned about getting right Perhaps thats cause Don perfectionist kind person would balance wheel wheelbarrow Czech submarine contest high points life getting news what other modelers doing Id like share Lubomir Koutnys account contest Czechoslovakia likes drought-ridden Califor nians long Boys Zabreh north Moravia began arrange A0-scale contest little town did very well am sorry weather perfect submarine contest rain damp air very well Scale big perfect varnish like Straniks twin Batman won Other boys give Scales over hot car engine before next flight get idea guess spoiled re member flying guys southern France flew rain shine often packed model boxes cars after sunset Plastic vs rubber have hearing nasty rumors late rubber stored plastic con tainers may deteriorating accelerated rate might due outgassing plastic container have rubber stored type container length time under optimal conditions airtight out heat might want check out let know harm seems have done Im sure other readers would really happy know whether good way store precious rubber motors Well until next time guys gals always re member Dont dope models sandstorms things wont too rough Conscientious/Baker Continued page 77 stab lightweight aligns itseli small notch DT line tht trailing edge action SHOC-typt stab front mount centers leading edgc well enough negating need keying An added advantage system thaI its free move meeting obstruc Man turer Hi Performa utba$Is andraft CULPEPPER C MODELS INC 2526 Washington DubuqmIA 520411 31015834830 180 Model Aviation PRODUCTS FOR THE O4SCERNING MODELER FF Duration/Linstrum Continued page 71 Made America American Technology RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Fot-ster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Coil wrte free information RJL Industries PO Box 5 Sierra Mack-e CA 91025 818 359-0016 Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanshin & Perfomance Serious Horsepower3 0S ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shade Performance Specialties Send $1 00for fully illustrated catalog Available VS Long & Short Stroke 06 Long Stroke 06 6IFSR 06 40 VRP/VF 06 91 VRDF STX-40 Rossi 40 coming soon mare information Call 619 729-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 tion would break keyed stabilizer notched peg holds rubber DT line can made A6 ply popsi cle stick tongue blade wood dowel aluminum tubing peg mounting platform stabilizer should also /~ ply peg must able withstand certain amount strain Wing heavy-duty spar shown plans Ive never broken wing Maybe spar too heavy like up per main spar can made either very hard balsa spruce other spars can medium 8-10-lb balsa shear webbing between spars very important Installing pieces along centers spars shown plan ideal find making full depth locating along side easier adequate -in hard balsa angled center dihedral brace can also made full depth Shim up rib fronts A2 above leading edge small taper cut can made will shape leading edge conform undercambered ribs Shim up rear end ribs trailing edge A2 same reason wing can built jig youre going build several wings jig highly recommended jig used airplane allowed wing built piece except lower spar added air later use jigs dates discovery warps plagued induced during process adding dihedral dont usually shim washout since about washout seems occur auto matically tissue doped wing mount motor tube de signed lightweight rigid platform wing rest quick way achieve perfect fit wrap piece sandpaper around tube lightly sand mount base shape Dont glue wing mount fuselage until model ready fly must adjusted achieve correct CG center-of-gravity After mount glued place make sure theres enough stabilizer tilt produce left turn Propeller may try write detailed arti cle propeller carving soon sub ject has covered thoroughly else Wood selection primary impor tance block should hard about 14 lb uniform density produce blades both thin strong Lay out top bottom profiles making sure centerline top profile parallel edge block same bottom line side profile Set block drill press drill hole hinge Cut out profiles band saw Carve bottom blades first com pletely finishing before starting top sure keep track right left blades once carved six left-handed blades before realized what doing Thank fully wife saved day suggesting carve six right-handed blades Try about /16 undercamber midblade progressing no undercamber tip Begin carving top blade get ting down about A-in thickness Make high point airfoil its helpful mark about one-third chord Take time Carve thin slices chunks Shape blade aft high point sort triangular profile start final shaping leading one-third high point thickest part blade should about /16 tip midblade Add A4 A2 ply doublers /32 OD tubing hinge Place blade Z-bar hub drill holes limiting pins A6 drill mounted pin vice Take extreme care drilling holes blades track properly sight turning blades pro file should perfect alignment other Finish propeller Deft equivalent cant find Deft local hardware store Ive noticed listed Lee Campbells catalog nose plug made A-in sheet balsa laminated cross-grained first lam mate fits inside motor tube sec Electric Flight f Controller Perfect 05 Motors 510 cells 2mooth Has Brake Lightweight 12 Adjastobte switching pointssoney hock Soldertess tenssisot ror easy hookup guarantee ON/OFF Controller $2495 Power save weight very high efficiency ossty O06V loss 77 22x13x63 Colifoneejo residents add 65% $163 Tax Add $100 foe shipping Send Check money order wessaitiHigh Sky Futaha cossoetoc Kansas St #9 othn availableSan DiegoCA 92104 23rd consecutive year covering continues go easier & last longer rest Congratulations Super Coverite September 1990 181 JET bust completely finished authentically detailed poseable 1/8 scale Al QC1Ir pruu209 2244170 II p0 box 5631fresno Ca 93755 II ond should conform outside shape tube brass aluminum tube can inserted plug smaller pieces tubing approximately 1/8 long inserted end form bearings wire prop shaft Use Loc-Tite similar product adhere inner pieces tubing outer tube Use CyA cyanoacrylate glue install completed bearing nose block Add plywood face least large external ball bearing wont crush balsa Use good spring such available through FAI Model Sup ply Dont use ball-point pen spring other cheap alternative might take set Make Z-bar out A6 music wire Use Sta-Brite equivalent hard solder Never trust soft solder hold propeller hub together First balance Z-bar alone attach blades balance again used make batch blades pairmatch according weight simi larity As recall averaged eight 10 grams try dont get confused about right- left-handed blades did winding hook shown plan works quite well rubber will stay cen tered unless Newton wrong dont understand winding hooks winding tubes stooges other aspects rubberpowered model technology buy Don Ross book Rubber Powered Model Airplanes AMA Supply Service catalog motor made up enough 34-in strands weigh 85 90 grams dry Consis tency whats wanted should no slack used size motor Mulvi hills nearly Old-Timer Rub ber models such Lanzo Stick Korda Dethermalizer may able everything thing did learn wind motor consistently Trying get used different motors dif ferent models can very stressful con test time Life John Wayne says movie Iwo Jima tough its tougher youre stupid Keep simple Choose motor get used Youll make fewer stupid mistakes under pressure competition Trimming balancing center-ofgravity shown plan best allaround thermal windy weather flying flying early morning still air CG could moved slightly aft decalage reduced model designed stability reliability rather absolute max imum performance Set SHOC stabilizer mount about /l6 tail cone making careful cuts Zona saw removing wood tween cuts create flat spot sup port mount should tilt slightly right making left tip about er right wing mount should have no inci dence relative motor tube deca lage established angle stabi lizer sitting aft block under its trail ing edge angle should two three degrees about / higher trailing edge Glue wing mount place mo tor loaded making sure balancing mark 6ver CG Use large table square set wing mount square motor tube key gluing /16 x A-in balsa strips bottom wing across chord wing goes same position time cant shift dur ing flight will happen its left un keyed Key nose block assembly fuse lage bit A-in ply needed LANDER INDUST 1005 19TH ST CT HAYRE MONTANA 59601 4062656529 BUILDING BOARD 30x48 $4895 ncf 24 X 66. $6395 inc frI CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surface bonded 3/4 laminated warp tree base straight true work surface will last years years CHECK EM ALL OUT English Lcitlicr CALENOAR GIRL CNALLENGE 19 AUG AC MODELER NW 503 646-4531 PORTLAND OR 26 AUG JOES HOBBY CTR 313 933-6567 DETROIT Ml 9/22/23 CENTRAL PENN 717 564-3280 HARRISBURG PA $2500 STARHAWK FUN FLY NEW STARHAWK BIPLANE NEW MISS STARHAWK POSTER See Starhawk Dealer details write Thorpe Engineering Corporation 1715 E Fairfield Mesa AZ 85203 Poster $500 P&H Prepaid 182 Model Aviation Airtronics powerful 94141 Mian Servo strongest servo its size ever produced Compactly designed Ito provide max imum torque space restrictive RC applica tions precision ball bearing 94141 well suited types ahtraft Compatible Airtronics radio systems 94141 ideal use sailplane flaps ailerons formula pylon air craft electric R/C alitraft rued 94141 servo utilizes metal output gear coupled durable metal molded gear train Its reinfoned case features unique side mounting brackets allow easy horizontal servo place ment inside aircraft wings information about Airteunics quality pmducts please call write address above 94141 Specifications Part Number 94141 Description Precision High Torque Ball Bearing Micro Servo Dimensions L 137 36mm W 060ISmm H 127 325mm Weight118 oz 33 grins Torque 45 oz/in 32 kg/cm Transit Time 025 seconds 600 rocacion Equipped splined stand ard size servo arm 94141 features ball bearing supported output shaft high quality coreless motor advanced electronic componentry No cornparably sized lightweight servo matches superior strength high torque powerful performance Airtronics 94141 I\hcro Servo SetThe Standani jAIRTRONICS INC Autry Irvine CA 92718714 830-8769 wood screw stop Dont omit screw will tear out balsa stop against screw nose plug place its blades folded either side motor tube determine best placement in spruce key locks nose block against rotation Zona saw cut away inner nose block ring key slot motor tube match photo will clarify operation Its im portant have two key points distri bute shock shaft striking screw prop has lot kinetic en ergy keys take quite load Its also good idea double motor tube covering material around key slots hooks seen photos proSMALL RIC HOBBY DEALERS! WE ARE DISTRIBUTOR KEYED TO YOUR PARTICULAR NEEDS information write call Southern Hobby Distributors 256 Madison Blvd Madison TN 37115 615 868-2100 1030 AM 500 PM CST peller blades made soft wire such paper clip Note location hooks somewhat aft hinge line blades folded rubberband hook goes over front Z-bar back other hook Change rubberbands before contest two reasons First its very important blades fold way back against mo tor tube stay way otherwise glide trim will thrown off Second rubberbands deteriorate very rapidly sun drafting triangle again using trusty worktable square check propeller blades track identical angle blade Also check static hAYALOISSRSSEOESASS DOGS X&.DIMS CONrAIl FUSE SIZE RECORDS MOM 97005 FATNDHASEOASSAMLM SHOE SOOTHEASTERN NE 19399AETELEHAS BEER ABE BOMBER AESOARIXSPETENRE vED LAER ER balance like Z-bar shown aluminum hub FAI Model Supply could substituted Cut small rudder tab about /a x 1 /2 trailing edge fin glue back place approximately /I6 left deflection small carpenters square check front end motor tube downthrust right thrust angles should about l should weigh about eight ounces ready fly 90 grams about three ounces contributed motor Oil propeller bearings lube motor youre ready fly Flight testing trim adjustment U3- Corter Rubber Band Powered He1icoper Flying repeatibillity coniStflt remult Flyn FOISWAI5D 5 gacewans nanEns TUESS CAM EBSI Fly IN TESTES HAD NO FEaTURES hPOHrrSApplitd BatS & Paper CENS$PEHIiON Setailed liSp ISep NStFOciiSflS 555tH pSPtS mE-COTinILLEM ASM AirIranse irreStly Sn FULL SIZE PLANS IS ISMS EESy ESSeFAIS / 7/ \T HhSlD 9O PD September 1990 183 Small Wonder ZAP UNIVERSITY COLLEGE OF GLUE KNOWLEDGE RONS MODEL Radio Controiled BUILDINGAirplanes Other Aircraft Boats 213 451-0414 ii Build Ry model should climb right turn glide left Glide controlled stabilizer tilt thickness aft incidence block Climb adjusted after satisfac tory glide trim has established Adjust climb small changes thrust line Thrust adjusted gently filing end motor tube change angle nose block rests very small increments Dont fly full power until youre completely satisfied models trim Make sure model climbs right turn avoid tendency loop hang prop power stall youre ready fly full power launch model about 450 angle tends go its pointed have flown few Conscientious Objectors just didnt want turn left glide ri diculous amount tilt stabilizer simply let turn right glide well climb Still unless really know what youre doing left glide right climb safe way go Dethermalizer accompanying photo dethermalizer shows its layout quite clearly guide tube under SHOC sta bilizer mount has multiple functions con ducts DT line keeps stabilizer rub bers touching line serves DT limit stop piece monofilament line can used DT line loop end fitted over peg top sta bilizer rubber must installed over loop stay place rubber loops over peg extends across leading edge stabilizer goes down around fuselage back up peg bit fuel tubing serves nicely DT line limit can tied line simple overhand knot adjusted strike line guide tube under SHOC mount tubing should adjusted allow about 450 stabilizer DT angle Tied other end DT line paper clip wire hook fuse rubberband extends hook across fuse around motor peg Use sharpened piece aluminum tubing drill holes fuselage makes cleaner hole does drill Use A-in tube fuse holder extending through both sides fuselage way can poke fuse material through piece wire can also pull out bit fuse case delay between lighting launching Glue tube firmly place heat sink can made alumi num can must selected care Ive used Coors Light cans cant say whether another brand would work well will gladly try answer questions might have about Conscientious Ob jector Send SASE 1902 Peter Pan St Norman OK 73072 responding advertisers mention read about Model Aviation Convert/McKinley Continued page 82 charge rather three some plan ning use small battery packs can aim think 20- 30-sec motor runs climb rates equal glow- ignition-powered models little no weight penalty Rally/Homer Continued page 88 forget did didnt fly AMA Rally Scobie Field Nor will other Houston modelers Bomber Field Club planning major event October Sev eral B-17s air simultaneously would something behold AMA Frequency Committee member George Steiner traveled Sacra mento CA teamed Bob Spivey Aus tin TX handle transmitter impound chores Charlie Marilyn Stevens Vance Dottie Wyman coordinated host local volunteers assist planning running event course rally would have possible efforts AMA HAMCI staff volunteers AMA Presi dent Don Lowe District VIH Vice Presi dent Gene Hempel AMA Executive Di rector Vince Mankowski hand Continued page 188 184 Model Aviation Caii Write 435 San Vicente Bivd J Santa Monica CA 90402 turn yoor printer lot oil plotter with.. FOILED AGAIN! C PLOT AIRFOILS IN ANY CIIORD u 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR 5HEETED WINGS ENTER DATA EASILY VIA INTELUGENT EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES 18-PAGE ILLUSTRATED U5ER MANUAL $45oo a cram prom slain ~2Z4i IiwflaihOO COopuV ira dot INI Clv conwaS potfli tWo w* irding ipioty 550 o 30 dOic Sm ram urocoy ordi CYGNET Software714 4966961 24843 Del Prado #141B Dana Point CA 92629 CAPACITIVE-DISCHARGE IGNITION SEA5 AMAN No moving parts No eng ne mod oat ons Basic unit $ 9995 Opposedcylinder twin $ 11995 ELECTRONIC CIRCUITRY REPLACES ANY MECHANICAL ADVANCE MAKES MAGNETO CONVERSIONS SNAPII
Edition: Model Aviation - 1990/09
Page Numbers: 74, 75, 76, 77, 180, 181, 182, 183, 184
Conscientious Objector Looking model can stand up rough-andtumble AMA Cate gory II Ill competitionand win robust rubber-powered Mul vihill good bet EBill Baker MOST MULVIHILL DESIGNS have published seem intended Category competition five-minute maxes judge relatively large fragile struc tures designed succeed events flown under AMA Category II III rules knew contests Id flying would involve windy weather small rough fields time Category II III rules would hold three- twominute flight times first three flights Conscientious Objector somewhat smaller typical Mulvihill design its also much less fragile model ca pable five minutes early morning air wont much good wing folds first windy flight gets beat shreds push five maxes just reach requirement five-minute max model competitive Id hoped will three minutes easily tactic fly early getting first three four flights before wind downdrafts strengthen try pick up some lift four- five-minute maxes Most competition will elim inated thensometimes can look back half-century model building Ive enjoyed being involved nearly facet hobby Ive flown CL RC mostly sport flier course have flown practically type Free Flight model known Most competition flying has Free Flight concentrating Gas events dropped out Free Flight about 1964 flew RC until 1976 Around time old Free Flight urge crept up again attended contest see what changed decided would fun learn new event like Rubber rather falling back old Gas groove happened long before Bob Dunham published Draft Dodger April 1975 issue Flying Models Id long awe Dunhams great-flying Rubber models Draft Dodger im mediately claimed interest Mass-produced Draft Dodger parts tum bled out workshop like Henry Ford cars point early process counted three wings five fuselages four stabs four props just keep two mod els flying competition surprise novice Rubber flier time models flew very well win ning contests 1979 started making few changes important rolled balsa tube fuselage did nothing im prove performance fuselage much less prone damage also rede signed wing mount modifications added up very practical Category Ill w model dubbed Conscientious Objec tor because wasnt exactly Draft Dodger anymore took both stock Draft Dodger newly evolved Conscientious Objector 1979 Nationals CO very high pitch prop giving longer slower climb contrast explosive power burst generated low-pitch prop Draft Dodger Wind conditions very strong blowing right across ocean corn two planes allowed event strat egy fly Draft Dodger first four flights knowing within three min utes would either corn OOS out-of-sight would likely lost fourth flight held Conscien tious Objector reserve fifthand hoped winningflight strategy worked though 74 Model Aviation Above The author showing off Conscientious Objector wheatfield near Norman OK No oil well background Isnt Bills probably wouldnt object owner bequeathed him Below authors iong-sufferlng hungry wife Paula holding up model show its lines promise lunch soon ordeal over Draft Dodger damaged after flight mostly wing mount damage diagonals broken out its explosive climb rate model flew through ground turbulence slower climbing Conscientious Ob jector wouldnt have able cope Still using tubular fuselage contin ued adapt Conscientious Objector un til virtually no remaining parts identi cal Draft Dodger guess difference between plagiarism research sources borrow adapted prop published years ago Frank Parmenter borrowed stabilizer structure Bob Whites Twin Fin also used simple Z-bar-type propeller hub copied wing mount few other ideas Jim OReilly invented better winding hook worked out sim ple reliable dethermalizer setup probably owes something lot differ ent people tried longer motor tubes va riety wings some area dif ferent dihedral schemes others differ ent airfoils experimented sev eral propellers model presented represents what judgment best compromise achieving key objective Mulvihill thats competitive Category III might want increase wing area 300 sq motor tube 42 model will serve flyoff five minute rounds Category may also want increase propeller diameter half-inch 95% Mulvihill flying done US model pre sented very competitive After 1979 AMA Nationals win Draft Dodger flew two Na tionals under Category III rules placed both third fifth time Conscientious Objector failed place Nats event surprise flown under Category rules As time went interests shifted Old-Timer events began attending SAM Champs instead AMA Nats Nevertheless continued well Conscientious Objector local re gional contests until found myself unable meet physical demands Free Flight competition present Im enjoying RC Sailplanes Conscientious Objector has permanent niche affections Id like think somewhere someone will flying Category III Mulvihill winning Construction motor tube fuselage houses mo tor also holds other parts air plane proper relationship another Though several fuselages built square cross section found tube config uration has best strength-to-weight ratio Use A6 x 4-in-wide 6- 8-lb A-grain balsa Make sure wood uniform density grain through entire length piece its much harder edge other transitions C-grain dont use Using metal straightedge trim sides true Seal wood side two coats Deft semigloss clear dope Sand gently between coats dry wet entire piece water will cause curl unpainted side expands Form wet balsa around 1 A-in-dia dowel after first scoring line down center dowel align balsa Largediameter dowels can procured hardware store lumber supply company believe theyre intended clothes closet hanging rods Jim OReilly once suggested using fluorescent tubes form motor tube Fearing would fall off ladder dur ing construction opted wood dowel Its also easier carve tail cone wood Ever try carving fluorescent tubing Wrap wood gently strips cloth gauze Ace bandage let dry Remove wood dowel apply Titebond along edges draw together Secure bits masking tape allow dry Make one-inch-wide nose doubler tail doubler about 1 wide simi larly prepared balsa doublers will Left Looking underside wing mount can see two lengths oil/a x 1A-in balsa used key wing pylon mount piece glued side wing pieces also serve fill gap between top pylon bottom undercambered wing Right Construction details wing mounting pylon side rails I/ x % spruce An easy way shape base pylon wrap sandpaper around motor tube sand pylon base perfect before final installation September 1990 75 Close-up view simple effective reliable dethermalizing mechanism motor peg tube fuse tube aluminum drink can heat sink can seen fuselage forward fin Small pieces %-in aluminum tubing serve guides limit line slip inside tube Glue place Titebond similar product sure let aft doubler protrude tube about youll have something glue tail onto tapered end forming dowel plane rasp easily form tail cone amount taper isnt crit ical 1 /4 narrowing 34 about right Make circular former hard -in balsa two cross-grained /16 pieces Fit former inside aft doubler end motor tube will prevent damage tapered cone should motor break Place another -in former area SHOC mount multifunction stabilizer mount attributed Sky Hoppers ange County California Dont worry rolled tube isnt per fectly circular Lay table allow roll until stops Let flat spot side top bottom 900 discernible curvature tube let concave side bottom joining tail cone eyeball closely can isnt perfect cone mount top forms straightest line motor tube motor pin must strong since tre mendous force exerted upon pin must course removable order change motors Use least A-in pin 1/2 SOFT BALSA WING TIP 9 SECTION DIHEDRAL BREAK RAISE T P 4 1/4 1 22I ZV LLI Ii 1/16 BAlSA SHEET 00155 DIGS 3/32OSIIRI S I/IA WIRESLIM ThBE RINK HOLE THIS LINE PARALLE 1/32PLYTO ESSE OF BLOCK PROP ERN n OCT COTTOM CC TOO TO MANO MRPOL SDOPE FRORT THIN TOrISOL CORNER TOIC4 TDICN AT HOC COIRT S THIRDSTOOL PROP BLADE CROSS SECTIONS NOT TO SCALE 3/32OIA3/5 015 HOLE HOLES /5 ALJMPJJM WINDING HOOK NOTE 3/64 TO 116 DOWN THRUST FOSELASE IS TJBE MADE BALSA SHEE 76 Model Aviation proplhub/nose block mechanism offset slot motor tube clearly seen offset makes impossible mount nose block upside down plastic press-on wheel collars attach blade Z-bar must leading edge theyll thrown off along blades creating lot noise very little thrust crashed airplane Another view prop/hub/nose block assembly showing doubled blade hinge assembly Zbar spring bearing motor hook Complete instructions carving blades nose block fashioning hub mechanism included text clearly detailed plan Finished aluminum hubs function just well can purchased through FAI Model Supply Wing jigs important especially mass-producing wings jig building wing shown plan background foreground jig polyhedral variant prop/hub/nose block assembly attached motor tube Note blades fold flush against tube its important fold way back against shown stay way during glide Otherwise glide trim will thrown off Full-Size Plans Available. See Page 196 I/IA I/A HALSA WEBS 1/B BALSA SPAR NO DIHEDRAL BREAK AT CENTER LINE WIN~ PlAN I4 SO BALSA LEADING EDGE DIHEDRAL BREAK RAISE WING TIP 4-1/4 imi~ _[-t___ OUBL TOP 0 3 -- F AR BALSA 29 OF UK BALSA GA HESHEAR WEE AT DIHEDRAL JO/AT LEL I/H HARD BALSA_ IM OP I/3D LEDIHEDRAL WING RIB PATTERN BRACEAIRFOIL IS DUNHAM-BARER- REEHOK 00KGOLDBERG PASTIC IDE OFZ AGR AS THE WHEEL OLLAR FAI MODEL SUPPLY RGLL TEREARING AND SPRINO 3D PLO NCE WREI/IA ID TUBE GAVB SPRUCE KES HEW WITH EMOVED NOSE/PROP DETAILI/IA BALSA SHEET S/A UPRJCE I/RBALSATF-I B F-B SHEET___________ F-234 aUNT WINS INCIDENCE 0 ICALE Ir\IIilIIIIITi~ F-I FOED CUFHF5 I/B 3/IA SPRCE RAILS / FUSELAGE SIDE VIEW I/H GO BALSA DOG BLER I/A BALSA SHEET GUSSETS /H SG RGLSA LE I/H SO EALSA DOUBLER I/A RALSA4 \JL/ N SHEET TP END IEW I/H BALSA SHEET RIBS AT DIHEDRAL BREAK 1/ H PLY I/IA BALSA VIA BALSA SHEET/64 PLO I/3D HALSA SHEET SHEAR WEBS STAB STAB DIAGONAL I/IA BA3A SHEET PROP BEARING DETAIL NO SCALE TWO I/H HALSA SHEETS CROSS URANED ALUM SODA CAN HEAT SINE BOTH I/A DIASIDES MOTOR PIN NOTE COMPLETE MODEL RTF WITH MOTOR THEN GLUE WING MOANT ON WITH ARKED ON WING MOUNT OVER ACTUAL C S I/B I/IA BALSA SPARS TOP AND BOTTOM STABILIZER VIE BALSA RIBS /8 50 BASA- TRANS EDGE I/IA HASA DI AS ON ALS I/H BALSA SHEET 1/4 BALSA INCIDENCE BLOCK-TRIM FOR RUDGER TAB -DD TO -3 INCID I/A EFT I/lA PLY SHOC MOUNT 1/H ALUM TUBE CRIMP ALUM TUBE 1/4 BALSA I/H BALSA I/ADD ALUM TUBE THRA FUSELAGE /16 BALSA SHEET DOURLER PAPER CLIPCRIMP ALUMTRACING BY OE DEMARCO HOOKTUBE MODEL ATION CONSCIENTIOUS OBJECTOR DESIGNED BY BILL BAKER reinforce tube holes made fin can made %-in light sheet balsa save weight cant find four- six-pound sheet built-up fin could used course would prone battle damage install fin lay tube its side flat table Block up fin books pieces wood its centered tube parallel table glue place As long fin parallel direction flight symmetry tail cone critical Ron Robertti once told tail aint straight retorted thing needs turn anyway Covering fuselage cover tubes tissue sometimes silk Ive also used polyester cloth intended dress making Its very tough comes pretty colors wrinkles can elimi nated through heat shrinking down side its little heavier other materi als next tube Id like try O6-oz fiberglass cloth clear dope adhe sive dont usually cover tail cones fins would use tissue did un covered areas including prop usu ally finished Deft semigloss wood filler/sealer available hardware store stabilizer quite conventional Its also lightweight trouble-free Note both leading trailing edges made A-in-sq stock Round off leading edge put slight taper trailing edge Beauty second ary lightweight warp-free construc tion model flying speeds slow wide sharply tapered trailing edge would simply excess weight Hence truncated trailing edges used both stabilizer wing Note point needed con nect both DT dethermalizer limit line front stab hold-down rubber Also note absence need sheet fill September 1990 77 Continued page 180 Three Mulvihill standouts author Bill Baker left George Perryman center Jim OReilly placed first second third both 1979 1982 AMA Nats ALL STAINLESS STEEL HEAD LITE IItm BEST GLOW PLUG CONNECTOR Stainless Steel HEAD LOCK BEST DESIGNAll Welded No Solder Acid Flux Flexing Wires BEST NiCadField Replaceable 12 AH SANYO 15 AH PANASONIC BEST QUALITY & GUARANTEE MODEL PRODUCTS CORPORATION BEST PRICESt #045-WIO NiCad Charger$ 995 available write directSt #040-With NiCad$ 1595 add $100 $200 outside US St #041-With NiCad & Charger $ 2595 MODEL PRODUCTS CORP RO Box 100 Allamuchy NJ 07820201850-1508 have coloring model planes using method years Unlike Floquil butyrate-jar skimming inexpensive food markets fabric outlets sell Rit dyethe powdered kind comes infinite variety colors can used straight blended just right color use baby food jars mixing Open pouch Rh dye pour few beads jar pour some dope thinner acetone top will surprised quickly thin ner snatches color dye Keep blending using raw balsa sticks test against color sam ple want match Once satisfied add about 20% clear dope mix always put couple thin coats clear dope model first prevent creeping Rit will give lively-looking color saving little jar will allow patching later Just add thinnerthere no pigment Work takes longer tell about FF Scale/Warner Continued page 73 Investigation problem turned up fact Federal Standard screwed up 1964 changed color standard original WW II olive drab new kept old number F534087 confuse modelers restorers make things worse Uncle Sam gave same number very dark brown olive drab March 1979 meant modelers three FS34087s choose January 1984 34087 reappeared original shade gloss semigloss versions OD dark brown version 1979 14087 24087 June 1984 GSA decided straight en things out issued change notice ef fect color chip 34087 dated March 1979 wrong color shall used colors 14087 24087 34087 represent two different colors lors have re numbered follows 14087 now 14084 24087 now 24084 34087 now 34088 makes five matte olive drabs pre-1964 34087 post-1964 34087 March 1979 34087 wrong color 1984 34087 1984 Change Notice 34088 same color later 34087 new FS595B being printed riht now should take care confusion right Dont count Don suggests build Navy aircraft forget about olive drab alto gether case its nice see company concerned about getting right Perhaps thats cause Don perfectionist kind person would balance wheel wheelbarrow Czech submarine contest high points life getting news what other modelers doing Id like share Lubomir Koutnys account contest Czechoslovakia likes drought-ridden Califor nians long Boys Zabreh north Moravia began arrange A0-scale contest little town did very well am sorry weather perfect submarine contest rain damp air very well Scale big perfect varnish like Straniks twin Batman won Other boys give Scales over hot car engine before next flight get idea guess spoiled re member flying guys southern France flew rain shine often packed model boxes cars after sunset Plastic vs rubber have hearing nasty rumors late rubber stored plastic con tainers may deteriorating accelerated rate might due outgassing plastic container have rubber stored type container length time under optimal conditions airtight out heat might want check out let know harm seems have done Im sure other readers would really happy know whether good way store precious rubber motors Well until next time guys gals always re member Dont dope models sandstorms things wont too rough Conscientious/Baker Continued page 77 stab lightweight aligns itseli small notch DT line tht trailing edge action SHOC-typt stab front mount centers leading edgc well enough negating need keying An added advantage system thaI its free move meeting obstruc Man turer Hi Performa utba$Is andraft CULPEPPER C MODELS INC 2526 Washington DubuqmIA 520411 31015834830 180 Model Aviation PRODUCTS FOR THE O4SCERNING MODELER FF Duration/Linstrum Continued page 71 Made America American Technology RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Fot-ster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Coil wrte free information RJL Industries PO Box 5 Sierra Mack-e CA 91025 818 359-0016 Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanshin & Perfomance Serious Horsepower3 0S ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shade Performance Specialties Send $1 00for fully illustrated catalog Available VS Long & Short Stroke 06 Long Stroke 06 6IFSR 06 40 VRP/VF 06 91 VRDF STX-40 Rossi 40 coming soon mare information Call 619 729-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 tion would break keyed stabilizer notched peg holds rubber DT line can made A6 ply popsi cle stick tongue blade wood dowel aluminum tubing peg mounting platform stabilizer should also /~ ply peg must able withstand certain amount strain Wing heavy-duty spar shown plans Ive never broken wing Maybe spar too heavy like up per main spar can made either very hard balsa spruce other spars can medium 8-10-lb balsa shear webbing between spars very important Installing pieces along centers spars shown plan ideal find making full depth locating along side easier adequate -in hard balsa angled center dihedral brace can also made full depth Shim up rib fronts A2 above leading edge small taper cut can made will shape leading edge conform undercambered ribs Shim up rear end ribs trailing edge A2 same reason wing can built jig youre going build several wings jig highly recommended jig used airplane allowed wing built piece except lower spar added air later use jigs dates discovery warps plagued induced during process adding dihedral dont usually shim washout since about washout seems occur auto matically tissue doped wing mount motor tube de signed lightweight rigid platform wing rest quick way achieve perfect fit wrap piece sandpaper around tube lightly sand mount base shape Dont glue wing mount fuselage until model ready fly must adjusted achieve correct CG center-of-gravity After mount glued place make sure theres enough stabilizer tilt produce left turn Propeller may try write detailed arti cle propeller carving soon sub ject has covered thoroughly else Wood selection primary impor tance block should hard about 14 lb uniform density produce blades both thin strong Lay out top bottom profiles making sure centerline top profile parallel edge block same bottom line side profile Set block drill press drill hole hinge Cut out profiles band saw Carve bottom blades first com pletely finishing before starting top sure keep track right left blades once carved six left-handed blades before realized what doing Thank fully wife saved day suggesting carve six right-handed blades Try about /16 undercamber midblade progressing no undercamber tip Begin carving top blade get ting down about A-in thickness Make high point airfoil its helpful mark about one-third chord Take time Carve thin slices chunks Shape blade aft high point sort triangular profile start final shaping leading one-third high point thickest part blade should about /16 tip midblade Add A4 A2 ply doublers /32 OD tubing hinge Place blade Z-bar hub drill holes limiting pins A6 drill mounted pin vice Take extreme care drilling holes blades track properly sight turning blades pro file should perfect alignment other Finish propeller Deft equivalent cant find Deft local hardware store Ive noticed listed Lee Campbells catalog nose plug made A-in sheet balsa laminated cross-grained first lam mate fits inside motor tube sec Electric Flight f Controller Perfect 05 Motors 510 cells 2mooth Has Brake Lightweight 12 Adjastobte switching pointssoney hock Soldertess tenssisot ror easy hookup guarantee ON/OFF Controller $2495 Power save weight very high efficiency ossty O06V loss 77 22x13x63 Colifoneejo residents add 65% $163 Tax Add $100 foe shipping Send Check money order wessaitiHigh Sky Futaha cossoetoc Kansas St #9 othn availableSan DiegoCA 92104 23rd consecutive year covering continues go easier & last longer rest Congratulations Super Coverite September 1990 181 JET bust completely finished authentically detailed poseable 1/8 scale Al QC1Ir pruu209 2244170 II p0 box 5631fresno Ca 93755 II ond should conform outside shape tube brass aluminum tube can inserted plug smaller pieces tubing approximately 1/8 long inserted end form bearings wire prop shaft Use Loc-Tite similar product adhere inner pieces tubing outer tube Use CyA cyanoacrylate glue install completed bearing nose block Add plywood face least large external ball bearing wont crush balsa Use good spring such available through FAI Model Sup ply Dont use ball-point pen spring other cheap alternative might take set Make Z-bar out A6 music wire Use Sta-Brite equivalent hard solder Never trust soft solder hold propeller hub together First balance Z-bar alone attach blades balance again used make batch blades pairmatch according weight simi larity As recall averaged eight 10 grams try dont get confused about right- left-handed blades did winding hook shown plan works quite well rubber will stay cen tered unless Newton wrong dont understand winding hooks winding tubes stooges other aspects rubberpowered model technology buy Don Ross book Rubber Powered Model Airplanes AMA Supply Service catalog motor made up enough 34-in strands weigh 85 90 grams dry Consis tency whats wanted should no slack used size motor Mulvi hills nearly Old-Timer Rub ber models such Lanzo Stick Korda Dethermalizer may able everything thing did learn wind motor consistently Trying get used different motors dif ferent models can very stressful con test time Life John Wayne says movie Iwo Jima tough its tougher youre stupid Keep simple Choose motor get used Youll make fewer stupid mistakes under pressure competition Trimming balancing center-ofgravity shown plan best allaround thermal windy weather flying flying early morning still air CG could moved slightly aft decalage reduced model designed stability reliability rather absolute max imum performance Set SHOC stabilizer mount about /l6 tail cone making careful cuts Zona saw removing wood tween cuts create flat spot sup port mount should tilt slightly right making left tip about er right wing mount should have no inci dence relative motor tube deca lage established angle stabi lizer sitting aft block under its trail ing edge angle should two three degrees about / higher trailing edge Glue wing mount place mo tor loaded making sure balancing mark 6ver CG Use large table square set wing mount square motor tube key gluing /16 x A-in balsa strips bottom wing across chord wing goes same position time cant shift dur ing flight will happen its left un keyed Key nose block assembly fuse lage bit A-in ply needed LANDER INDUST 1005 19TH ST CT HAYRE MONTANA 59601 4062656529 BUILDING BOARD 30x48 $4895 ncf 24 X 66. $6395 inc frI CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surface bonded 3/4 laminated warp tree base straight true work surface will last years years CHECK EM ALL OUT English Lcitlicr CALENOAR GIRL CNALLENGE 19 AUG AC MODELER NW 503 646-4531 PORTLAND OR 26 AUG JOES HOBBY CTR 313 933-6567 DETROIT Ml 9/22/23 CENTRAL PENN 717 564-3280 HARRISBURG PA $2500 STARHAWK FUN FLY NEW STARHAWK BIPLANE NEW MISS STARHAWK POSTER See Starhawk Dealer details write Thorpe Engineering Corporation 1715 E Fairfield Mesa AZ 85203 Poster $500 P&H Prepaid 182 Model Aviation Airtronics powerful 94141 Mian Servo strongest servo its size ever produced Compactly designed Ito provide max imum torque space restrictive RC applica tions precision ball bearing 94141 well suited types ahtraft Compatible Airtronics radio systems 94141 ideal use sailplane flaps ailerons formula pylon air craft electric R/C alitraft rued 94141 servo utilizes metal output gear coupled durable metal molded gear train Its reinfoned case features unique side mounting brackets allow easy horizontal servo place ment inside aircraft wings information about Airteunics quality pmducts please call write address above 94141 Specifications Part Number 94141 Description Precision High Torque Ball Bearing Micro Servo Dimensions L 137 36mm W 060ISmm H 127 325mm Weight118 oz 33 grins Torque 45 oz/in 32 kg/cm Transit Time 025 seconds 600 rocacion Equipped splined stand ard size servo arm 94141 features ball bearing supported output shaft high quality coreless motor advanced electronic componentry No cornparably sized lightweight servo matches superior strength high torque powerful performance Airtronics 94141 I\hcro Servo SetThe Standani jAIRTRONICS INC Autry Irvine CA 92718714 830-8769 wood screw stop Dont omit screw will tear out balsa stop against screw nose plug place its blades folded either side motor tube determine best placement in spruce key locks nose block against rotation Zona saw cut away inner nose block ring key slot motor tube match photo will clarify operation Its im portant have two key points distri bute shock shaft striking screw prop has lot kinetic en ergy keys take quite load Its also good idea double motor tube covering material around key slots hooks seen photos proSMALL RIC HOBBY DEALERS! WE ARE DISTRIBUTOR KEYED TO YOUR PARTICULAR NEEDS information write call Southern Hobby Distributors 256 Madison Blvd Madison TN 37115 615 868-2100 1030 AM 500 PM CST peller blades made soft wire such paper clip Note location hooks somewhat aft hinge line blades folded rubberband hook goes over front Z-bar back other hook Change rubberbands before contest two reasons First its very important blades fold way back against mo tor tube stay way otherwise glide trim will thrown off Second rubberbands deteriorate very rapidly sun drafting triangle again using trusty worktable square check propeller blades track identical angle blade Also check static hAYALOISSRSSEOESASS DOGS X&.DIMS CONrAIl FUSE SIZE RECORDS MOM 97005 FATNDHASEOASSAMLM SHOE SOOTHEASTERN NE 19399AETELEHAS BEER ABE BOMBER AESOARIXSPETENRE vED LAER ER balance like Z-bar shown aluminum hub FAI Model Supply could substituted Cut small rudder tab about /a x 1 /2 trailing edge fin glue back place approximately /I6 left deflection small carpenters square check front end motor tube downthrust right thrust angles should about l should weigh about eight ounces ready fly 90 grams about three ounces contributed motor Oil propeller bearings lube motor youre ready fly Flight testing trim adjustment U3- Corter Rubber Band Powered He1icoper Flying repeatibillity coniStflt remult Flyn FOISWAI5D 5 gacewans nanEns TUESS CAM EBSI Fly IN TESTES HAD NO FEaTURES hPOHrrSApplitd BatS & Paper CENS$PEHIiON Setailed liSp ISep NStFOciiSflS 555tH pSPtS mE-COTinILLEM ASM AirIranse irreStly Sn FULL SIZE PLANS IS ISMS EESy ESSeFAIS / 7/ \T HhSlD 9O PD September 1990 183 Small Wonder ZAP UNIVERSITY COLLEGE OF GLUE KNOWLEDGE RONS MODEL Radio Controiled BUILDINGAirplanes Other Aircraft Boats 213 451-0414 ii Build Ry model should climb right turn glide left Glide controlled stabilizer tilt thickness aft incidence block Climb adjusted after satisfac tory glide trim has established Adjust climb small changes thrust line Thrust adjusted gently filing end motor tube change angle nose block rests very small increments Dont fly full power until youre completely satisfied models trim Make sure model climbs right turn avoid tendency loop hang prop power stall youre ready fly full power launch model about 450 angle tends go its pointed have flown few Conscientious Objectors just didnt want turn left glide ri diculous amount tilt stabilizer simply let turn right glide well climb Still unless really know what youre doing left glide right climb safe way go Dethermalizer accompanying photo dethermalizer shows its layout quite clearly guide tube under SHOC sta bilizer mount has multiple functions con ducts DT line keeps stabilizer rub bers touching line serves DT limit stop piece monofilament line can used DT line loop end fitted over peg top sta bilizer rubber must installed over loop stay place rubber loops over peg extends across leading edge stabilizer goes down around fuselage back up peg bit fuel tubing serves nicely DT line limit can tied line simple overhand knot adjusted strike line guide tube under SHOC mount tubing should adjusted allow about 450 stabilizer DT angle Tied other end DT line paper clip wire hook fuse rubberband extends hook across fuse around motor peg Use sharpened piece aluminum tubing drill holes fuselage makes cleaner hole does drill Use A-in tube fuse holder extending through both sides fuselage way can poke fuse material through piece wire can also pull out bit fuse case delay between lighting launching Glue tube firmly place heat sink can made alumi num can must selected care Ive used Coors Light cans cant say whether another brand would work well will gladly try answer questions might have about Conscientious Ob jector Send SASE 1902 Peter Pan St Norman OK 73072 responding advertisers mention read about Model Aviation Convert/McKinley Continued page 82 charge rather three some plan ning use small battery packs can aim think 20- 30-sec motor runs climb rates equal glow- ignition-powered models little no weight penalty Rally/Homer Continued page 88 forget did didnt fly AMA Rally Scobie Field Nor will other Houston modelers Bomber Field Club planning major event October Sev eral B-17s air simultaneously would something behold AMA Frequency Committee member George Steiner traveled Sacra mento CA teamed Bob Spivey Aus tin TX handle transmitter impound chores Charlie Marilyn Stevens Vance Dottie Wyman coordinated host local volunteers assist planning running event course rally would have possible efforts AMA HAMCI staff volunteers AMA Presi dent Don Lowe District VIH Vice Presi dent Gene Hempel AMA Executive Di rector Vince Mankowski hand Continued page 188 184 Model Aviation Caii Write 435 San Vicente Bivd J Santa Monica CA 90402 turn yoor printer lot oil plotter with.. FOILED AGAIN! C PLOT AIRFOILS IN ANY CIIORD u 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR 5HEETED WINGS ENTER DATA EASILY VIA INTELUGENT EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES 18-PAGE ILLUSTRATED U5ER MANUAL $45oo a cram prom slain ~2Z4i IiwflaihOO COopuV ira dot INI Clv conwaS potfli tWo w* irding ipioty 550 o 30 dOic Sm ram urocoy ordi CYGNET Software714 4966961 24843 Del Prado #141B Dana Point CA 92629 CAPACITIVE-DISCHARGE IGNITION SEA5 AMAN No moving parts No eng ne mod oat ons Basic unit $ 9995 Opposedcylinder twin $ 11995 ELECTRONIC CIRCUITRY REPLACES ANY MECHANICAL ADVANCE MAKES MAGNETO CONVERSIONS SNAPII
Edition: Model Aviation - 1990/09
Page Numbers: 74, 75, 76, 77, 180, 181, 182, 183, 184
Conscientious Objector Looking model can stand up rough-andtumble AMA Cate gory II Ill competitionand win robust rubber-powered Mul vihill good bet EBill Baker MOST MULVIHILL DESIGNS have published seem intended Category competition five-minute maxes judge relatively large fragile struc tures designed succeed events flown under AMA Category II III rules knew contests Id flying would involve windy weather small rough fields time Category II III rules would hold three- twominute flight times first three flights Conscientious Objector somewhat smaller typical Mulvihill design its also much less fragile model ca pable five minutes early morning air wont much good wing folds first windy flight gets beat shreds push five maxes just reach requirement five-minute max model competitive Id hoped will three minutes easily tactic fly early getting first three four flights before wind downdrafts strengthen try pick up some lift four- five-minute maxes Most competition will elim inated thensometimes can look back half-century model building Ive enjoyed being involved nearly facet hobby Ive flown CL RC mostly sport flier course have flown practically type Free Flight model known Most competition flying has Free Flight concentrating Gas events dropped out Free Flight about 1964 flew RC until 1976 Around time old Free Flight urge crept up again attended contest see what changed decided would fun learn new event like Rubber rather falling back old Gas groove happened long before Bob Dunham published Draft Dodger April 1975 issue Flying Models Id long awe Dunhams great-flying Rubber models Draft Dodger im mediately claimed interest Mass-produced Draft Dodger parts tum bled out workshop like Henry Ford cars point early process counted three wings five fuselages four stabs four props just keep two mod els flying competition surprise novice Rubber flier time models flew very well win ning contests 1979 started making few changes important rolled balsa tube fuselage did nothing im prove performance fuselage much less prone damage also rede signed wing mount modifications added up very practical Category Ill w model dubbed Conscientious Objec tor because wasnt exactly Draft Dodger anymore took both stock Draft Dodger newly evolved Conscientious Objector 1979 Nationals CO very high pitch prop giving longer slower climb contrast explosive power burst generated low-pitch prop Draft Dodger Wind conditions very strong blowing right across ocean corn two planes allowed event strat egy fly Draft Dodger first four flights knowing within three min utes would either corn OOS out-of-sight would likely lost fourth flight held Conscien tious Objector reserve fifthand hoped winningflight strategy worked though 74 Model Aviation Above The author showing off Conscientious Objector wheatfield near Norman OK No oil well background Isnt Bills probably wouldnt object owner bequeathed him Below authors iong-sufferlng hungry wife Paula holding up model show its lines promise lunch soon ordeal over Draft Dodger damaged after flight mostly wing mount damage diagonals broken out its explosive climb rate model flew through ground turbulence slower climbing Conscientious Ob jector wouldnt have able cope Still using tubular fuselage contin ued adapt Conscientious Objector un til virtually no remaining parts identi cal Draft Dodger guess difference between plagiarism research sources borrow adapted prop published years ago Frank Parmenter borrowed stabilizer structure Bob Whites Twin Fin also used simple Z-bar-type propeller hub copied wing mount few other ideas Jim OReilly invented better winding hook worked out sim ple reliable dethermalizer setup probably owes something lot differ ent people tried longer motor tubes va riety wings some area dif ferent dihedral schemes others differ ent airfoils experimented sev eral propellers model presented represents what judgment best compromise achieving key objective Mulvihill thats competitive Category III might want increase wing area 300 sq motor tube 42 model will serve flyoff five minute rounds Category may also want increase propeller diameter half-inch 95% Mulvihill flying done US model pre sented very competitive After 1979 AMA Nationals win Draft Dodger flew two Na tionals under Category III rules placed both third fifth time Conscientious Objector failed place Nats event surprise flown under Category rules As time went interests shifted Old-Timer events began attending SAM Champs instead AMA Nats Nevertheless continued well Conscientious Objector local re gional contests until found myself unable meet physical demands Free Flight competition present Im enjoying RC Sailplanes Conscientious Objector has permanent niche affections Id like think somewhere someone will flying Category III Mulvihill winning Construction motor tube fuselage houses mo tor also holds other parts air plane proper relationship another Though several fuselages built square cross section found tube config uration has best strength-to-weight ratio Use A6 x 4-in-wide 6- 8-lb A-grain balsa Make sure wood uniform density grain through entire length piece its much harder edge other transitions C-grain dont use Using metal straightedge trim sides true Seal wood side two coats Deft semigloss clear dope Sand gently between coats dry wet entire piece water will cause curl unpainted side expands Form wet balsa around 1 A-in-dia dowel after first scoring line down center dowel align balsa Largediameter dowels can procured hardware store lumber supply company believe theyre intended clothes closet hanging rods Jim OReilly once suggested using fluorescent tubes form motor tube Fearing would fall off ladder dur ing construction opted wood dowel Its also easier carve tail cone wood Ever try carving fluorescent tubing Wrap wood gently strips cloth gauze Ace bandage let dry Remove wood dowel apply Titebond along edges draw together Secure bits masking tape allow dry Make one-inch-wide nose doubler tail doubler about 1 wide simi larly prepared balsa doublers will Left Looking underside wing mount can see two lengths oil/a x 1A-in balsa used key wing pylon mount piece glued side wing pieces also serve fill gap between top pylon bottom undercambered wing Right Construction details wing mounting pylon side rails I/ x % spruce An easy way shape base pylon wrap sandpaper around motor tube sand pylon base perfect before final installation September 1990 75 Close-up view simple effective reliable dethermalizing mechanism motor peg tube fuse tube aluminum drink can heat sink can seen fuselage forward fin Small pieces %-in aluminum tubing serve guides limit line slip inside tube Glue place Titebond similar product sure let aft doubler protrude tube about youll have something glue tail onto tapered end forming dowel plane rasp easily form tail cone amount taper isnt crit ical 1 /4 narrowing 34 about right Make circular former hard -in balsa two cross-grained /16 pieces Fit former inside aft doubler end motor tube will prevent damage tapered cone should motor break Place another -in former area SHOC mount multifunction stabilizer mount attributed Sky Hoppers ange County California Dont worry rolled tube isnt per fectly circular Lay table allow roll until stops Let flat spot side top bottom 900 discernible curvature tube let concave side bottom joining tail cone eyeball closely can isnt perfect cone mount top forms straightest line motor tube motor pin must strong since tre mendous force exerted upon pin must course removable order change motors Use least A-in pin 1/2 SOFT BALSA WING TIP 9 SECTION DIHEDRAL BREAK RAISE T P 4 1/4 1 22I ZV LLI Ii 1/16 BAlSA SHEET 00155 DIGS 3/32OSIIRI S I/IA WIRESLIM ThBE RINK HOLE THIS LINE PARALLE 1/32PLYTO ESSE OF BLOCK PROP ERN n OCT COTTOM CC TOO TO MANO MRPOL SDOPE FRORT THIN TOrISOL CORNER TOIC4 TDICN AT HOC COIRT S THIRDSTOOL PROP BLADE CROSS SECTIONS NOT TO SCALE 3/32OIA3/5 015 HOLE HOLES /5 ALJMPJJM WINDING HOOK NOTE 3/64 TO 116 DOWN THRUST FOSELASE IS TJBE MADE BALSA SHEE 76 Model Aviation proplhub/nose block mechanism offset slot motor tube clearly seen offset makes impossible mount nose block upside down plastic press-on wheel collars attach blade Z-bar must leading edge theyll thrown off along blades creating lot noise very little thrust crashed airplane Another view prop/hub/nose block assembly showing doubled blade hinge assembly Zbar spring bearing motor hook Complete instructions carving blades nose block fashioning hub mechanism included text clearly detailed plan Finished aluminum hubs function just well can purchased through FAI Model Supply Wing jigs important especially mass-producing wings jig building wing shown plan background foreground jig polyhedral variant prop/hub/nose block assembly attached motor tube Note blades fold flush against tube its important fold way back against shown stay way during glide Otherwise glide trim will thrown off Full-Size Plans Available. See Page 196 I/IA I/A HALSA WEBS 1/B BALSA SPAR NO DIHEDRAL BREAK AT CENTER LINE WIN~ PlAN I4 SO BALSA LEADING EDGE DIHEDRAL BREAK RAISE WING TIP 4-1/4 imi~ _[-t___ OUBL TOP 0 3 -- F AR BALSA 29 OF UK BALSA GA HESHEAR WEE AT DIHEDRAL JO/AT LEL I/H HARD BALSA_ IM OP I/3D LEDIHEDRAL WING RIB PATTERN BRACEAIRFOIL IS DUNHAM-BARER- REEHOK 00KGOLDBERG PASTIC IDE OFZ AGR AS THE WHEEL OLLAR FAI MODEL SUPPLY RGLL TEREARING AND SPRINO 3D PLO NCE WREI/IA ID TUBE GAVB SPRUCE KES HEW WITH EMOVED NOSE/PROP DETAILI/IA BALSA SHEET S/A UPRJCE I/RBALSATF-I B F-B SHEET___________ F-234 aUNT WINS INCIDENCE 0 ICALE Ir\IIilIIIIITi~ F-I FOED CUFHF5 I/B 3/IA SPRCE RAILS / FUSELAGE SIDE VIEW I/H GO BALSA DOG BLER I/A BALSA SHEET GUSSETS /H SG RGLSA LE I/H SO EALSA DOUBLER I/A RALSA4 \JL/ N SHEET TP END IEW I/H BALSA SHEET RIBS AT DIHEDRAL BREAK 1/ H PLY I/IA BALSA VIA BALSA SHEET/64 PLO I/3D HALSA SHEET SHEAR WEBS STAB STAB DIAGONAL I/IA BA3A SHEET PROP BEARING DETAIL NO SCALE TWO I/H HALSA SHEETS CROSS URANED ALUM SODA CAN HEAT SINE BOTH I/A DIASIDES MOTOR PIN NOTE COMPLETE MODEL RTF WITH MOTOR THEN GLUE WING MOANT ON WITH ARKED ON WING MOUNT OVER ACTUAL C S I/B I/IA BALSA SPARS TOP AND BOTTOM STABILIZER VIE BALSA RIBS /8 50 BASA- TRANS EDGE I/IA HASA DI AS ON ALS I/H BALSA SHEET 1/4 BALSA INCIDENCE BLOCK-TRIM FOR RUDGER TAB -DD TO -3 INCID I/A EFT I/lA PLY SHOC MOUNT 1/H ALUM TUBE CRIMP ALUM TUBE 1/4 BALSA I/H BALSA I/ADD ALUM TUBE THRA FUSELAGE /16 BALSA SHEET DOURLER PAPER CLIPCRIMP ALUMTRACING BY OE DEMARCO HOOKTUBE MODEL ATION CONSCIENTIOUS OBJECTOR DESIGNED BY BILL BAKER reinforce tube holes made fin can made %-in light sheet balsa save weight cant find four- six-pound sheet built-up fin could used course would prone battle damage install fin lay tube its side flat table Block up fin books pieces wood its centered tube parallel table glue place As long fin parallel direction flight symmetry tail cone critical Ron Robertti once told tail aint straight retorted thing needs turn anyway Covering fuselage cover tubes tissue sometimes silk Ive also used polyester cloth intended dress making Its very tough comes pretty colors wrinkles can elimi nated through heat shrinking down side its little heavier other materi als next tube Id like try O6-oz fiberglass cloth clear dope adhe sive dont usually cover tail cones fins would use tissue did un covered areas including prop usu ally finished Deft semigloss wood filler/sealer available hardware store stabilizer quite conventional Its also lightweight trouble-free Note both leading trailing edges made A-in-sq stock Round off leading edge put slight taper trailing edge Beauty second ary lightweight warp-free construc tion model flying speeds slow wide sharply tapered trailing edge would simply excess weight Hence truncated trailing edges used both stabilizer wing Note point needed con nect both DT dethermalizer limit line front stab hold-down rubber Also note absence need sheet fill September 1990 77 Continued page 180 Three Mulvihill standouts author Bill Baker left George Perryman center Jim OReilly placed first second third both 1979 1982 AMA Nats ALL STAINLESS STEEL HEAD LITE IItm BEST GLOW PLUG CONNECTOR Stainless Steel HEAD LOCK BEST DESIGNAll Welded No Solder Acid Flux Flexing Wires BEST NiCadField Replaceable 12 AH SANYO 15 AH PANASONIC BEST QUALITY & GUARANTEE MODEL PRODUCTS CORPORATION BEST PRICESt #045-WIO NiCad Charger$ 995 available write directSt #040-With NiCad$ 1595 add $100 $200 outside US St #041-With NiCad & Charger $ 2595 MODEL PRODUCTS CORP RO Box 100 Allamuchy NJ 07820201850-1508 have coloring model planes using method years Unlike Floquil butyrate-jar skimming inexpensive food markets fabric outlets sell Rit dyethe powdered kind comes infinite variety colors can used straight blended just right color use baby food jars mixing Open pouch Rh dye pour few beads jar pour some dope thinner acetone top will surprised quickly thin ner snatches color dye Keep blending using raw balsa sticks test against color sam ple want match Once satisfied add about 20% clear dope mix always put couple thin coats clear dope model first prevent creeping Rit will give lively-looking color saving little jar will allow patching later Just add thinnerthere no pigment Work takes longer tell about FF Scale/Warner Continued page 73 Investigation problem turned up fact Federal Standard screwed up 1964 changed color standard original WW II olive drab new kept old number F534087 confuse modelers restorers make things worse Uncle Sam gave same number very dark brown olive drab March 1979 meant modelers three FS34087s choose January 1984 34087 reappeared original shade gloss semigloss versions OD dark brown version 1979 14087 24087 June 1984 GSA decided straight en things out issued change notice ef fect color chip 34087 dated March 1979 wrong color shall used colors 14087 24087 34087 represent two different colors lors have re numbered follows 14087 now 14084 24087 now 24084 34087 now 34088 makes five matte olive drabs pre-1964 34087 post-1964 34087 March 1979 34087 wrong color 1984 34087 1984 Change Notice 34088 same color later 34087 new FS595B being printed riht now should take care confusion right Dont count Don suggests build Navy aircraft forget about olive drab alto gether case its nice see company concerned about getting right Perhaps thats cause Don perfectionist kind person would balance wheel wheelbarrow Czech submarine contest high points life getting news what other modelers doing Id like share Lubomir Koutnys account contest Czechoslovakia likes drought-ridden Califor nians long Boys Zabreh north Moravia began arrange A0-scale contest little town did very well am sorry weather perfect submarine contest rain damp air very well Scale big perfect varnish like Straniks twin Batman won Other boys give Scales over hot car engine before next flight get idea guess spoiled re member flying guys southern France flew rain shine often packed model boxes cars after sunset Plastic vs rubber have hearing nasty rumors late rubber stored plastic con tainers may deteriorating accelerated rate might due outgassing plastic container have rubber stored type container length time under optimal conditions airtight out heat might want check out let know harm seems have done Im sure other readers would really happy know whether good way store precious rubber motors Well until next time guys gals always re member Dont dope models sandstorms things wont too rough Conscientious/Baker Continued page 77 stab lightweight aligns itseli small notch DT line tht trailing edge action SHOC-typt stab front mount centers leading edgc well enough negating need keying An added advantage system thaI its free move meeting obstruc Man turer Hi Performa utba$Is andraft CULPEPPER C MODELS INC 2526 Washington DubuqmIA 520411 31015834830 180 Model Aviation PRODUCTS FOR THE O4SCERNING MODELER FF Duration/Linstrum Continued page 71 Made America American Technology RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Fot-ster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Coil wrte free information RJL Industries PO Box 5 Sierra Mack-e CA 91025 818 359-0016 Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanshin & Perfomance Serious Horsepower3 0S ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shade Performance Specialties Send $1 00for fully illustrated catalog Available VS Long & Short Stroke 06 Long Stroke 06 6IFSR 06 40 VRP/VF 06 91 VRDF STX-40 Rossi 40 coming soon mare information Call 619 729-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 tion would break keyed stabilizer notched peg holds rubber DT line can made A6 ply popsi cle stick tongue blade wood dowel aluminum tubing peg mounting platform stabilizer should also /~ ply peg must able withstand certain amount strain Wing heavy-duty spar shown plans Ive never broken wing Maybe spar too heavy like up per main spar can made either very hard balsa spruce other spars can medium 8-10-lb balsa shear webbing between spars very important Installing pieces along centers spars shown plan ideal find making full depth locating along side easier adequate -in hard balsa angled center dihedral brace can also made full depth Shim up rib fronts A2 above leading edge small taper cut can made will shape leading edge conform undercambered ribs Shim up rear end ribs trailing edge A2 same reason wing can built jig youre going build several wings jig highly recommended jig used airplane allowed wing built piece except lower spar added air later use jigs dates discovery warps plagued induced during process adding dihedral dont usually shim washout since about washout seems occur auto matically tissue doped wing mount motor tube de signed lightweight rigid platform wing rest quick way achieve perfect fit wrap piece sandpaper around tube lightly sand mount base shape Dont glue wing mount fuselage until model ready fly must adjusted achieve correct CG center-of-gravity After mount glued place make sure theres enough stabilizer tilt produce left turn Propeller may try write detailed arti cle propeller carving soon sub ject has covered thoroughly else Wood selection primary impor tance block should hard about 14 lb uniform density produce blades both thin strong Lay out top bottom profiles making sure centerline top profile parallel edge block same bottom line side profile Set block drill press drill hole hinge Cut out profiles band saw Carve bottom blades first com pletely finishing before starting top sure keep track right left blades once carved six left-handed blades before realized what doing Thank fully wife saved day suggesting carve six right-handed blades Try about /16 undercamber midblade progressing no undercamber tip Begin carving top blade get ting down about A-in thickness Make high point airfoil its helpful mark about one-third chord Take time Carve thin slices chunks Shape blade aft high point sort triangular profile start final shaping leading one-third high point thickest part blade should about /16 tip midblade Add A4 A2 ply doublers /32 OD tubing hinge Place blade Z-bar hub drill holes limiting pins A6 drill mounted pin vice Take extreme care drilling holes blades track properly sight turning blades pro file should perfect alignment other Finish propeller Deft equivalent cant find Deft local hardware store Ive noticed listed Lee Campbells catalog nose plug made A-in sheet balsa laminated cross-grained first lam mate fits inside motor tube sec Electric Flight f Controller Perfect 05 Motors 510 cells 2mooth Has Brake Lightweight 12 Adjastobte switching pointssoney hock Soldertess tenssisot ror easy hookup guarantee ON/OFF Controller $2495 Power save weight very high efficiency ossty O06V loss 77 22x13x63 Colifoneejo residents add 65% $163 Tax Add $100 foe shipping Send Check money order wessaitiHigh Sky Futaha cossoetoc Kansas St #9 othn availableSan DiegoCA 92104 23rd consecutive year covering continues go easier & last longer rest Congratulations Super Coverite September 1990 181 JET bust completely finished authentically detailed poseable 1/8 scale Al QC1Ir pruu209 2244170 II p0 box 5631fresno Ca 93755 II ond should conform outside shape tube brass aluminum tube can inserted plug smaller pieces tubing approximately 1/8 long inserted end form bearings wire prop shaft Use Loc-Tite similar product adhere inner pieces tubing outer tube Use CyA cyanoacrylate glue install completed bearing nose block Add plywood face least large external ball bearing wont crush balsa Use good spring such available through FAI Model Sup ply Dont use ball-point pen spring other cheap alternative might take set Make Z-bar out A6 music wire Use Sta-Brite equivalent hard solder Never trust soft solder hold propeller hub together First balance Z-bar alone attach blades balance again used make batch blades pairmatch according weight simi larity As recall averaged eight 10 grams try dont get confused about right- left-handed blades did winding hook shown plan works quite well rubber will stay cen tered unless Newton wrong dont understand winding hooks winding tubes stooges other aspects rubberpowered model technology buy Don Ross book Rubber Powered Model Airplanes AMA Supply Service catalog motor made up enough 34-in strands weigh 85 90 grams dry Consis tency whats wanted should no slack used size motor Mulvi hills nearly Old-Timer Rub ber models such Lanzo Stick Korda Dethermalizer may able everything thing did learn wind motor consistently Trying get used different motors dif ferent models can very stressful con test time Life John Wayne says movie Iwo Jima tough its tougher youre stupid Keep simple Choose motor get used Youll make fewer stupid mistakes under pressure competition Trimming balancing center-ofgravity shown plan best allaround thermal windy weather flying flying early morning still air CG could moved slightly aft decalage reduced model designed stability reliability rather absolute max imum performance Set SHOC stabilizer mount about /l6 tail cone making careful cuts Zona saw removing wood tween cuts create flat spot sup port mount should tilt slightly right making left tip about er right wing mount should have no inci dence relative motor tube deca lage established angle stabi lizer sitting aft block under its trail ing edge angle should two three degrees about / higher trailing edge Glue wing mount place mo tor loaded making sure balancing mark 6ver CG Use large table square set wing mount square motor tube key gluing /16 x A-in balsa strips bottom wing across chord wing goes same position time cant shift dur ing flight will happen its left un keyed Key nose block assembly fuse lage bit A-in ply needed LANDER INDUST 1005 19TH ST CT HAYRE MONTANA 59601 4062656529 BUILDING BOARD 30x48 $4895 ncf 24 X 66. $6395 inc frI CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surface bonded 3/4 laminated warp tree base straight true work surface will last years years CHECK EM ALL OUT English Lcitlicr CALENOAR GIRL CNALLENGE 19 AUG AC MODELER NW 503 646-4531 PORTLAND OR 26 AUG JOES HOBBY CTR 313 933-6567 DETROIT Ml 9/22/23 CENTRAL PENN 717 564-3280 HARRISBURG PA $2500 STARHAWK FUN FLY NEW STARHAWK BIPLANE NEW MISS STARHAWK POSTER See Starhawk Dealer details write Thorpe Engineering Corporation 1715 E Fairfield Mesa AZ 85203 Poster $500 P&H Prepaid 182 Model Aviation Airtronics powerful 94141 Mian Servo strongest servo its size ever produced Compactly designed Ito provide max imum torque space restrictive RC applica tions precision ball bearing 94141 well suited types ahtraft Compatible Airtronics radio systems 94141 ideal use sailplane flaps ailerons formula pylon air craft electric R/C alitraft rued 94141 servo utilizes metal output gear coupled durable metal molded gear train Its reinfoned case features unique side mounting brackets allow easy horizontal servo place ment inside aircraft wings information about Airteunics quality pmducts please call write address above 94141 Specifications Part Number 94141 Description Precision High Torque Ball Bearing Micro Servo Dimensions L 137 36mm W 060ISmm H 127 325mm Weight118 oz 33 grins Torque 45 oz/in 32 kg/cm Transit Time 025 seconds 600 rocacion Equipped splined stand ard size servo arm 94141 features ball bearing supported output shaft high quality coreless motor advanced electronic componentry No cornparably sized lightweight servo matches superior strength high torque powerful performance Airtronics 94141 I\hcro Servo SetThe Standani jAIRTRONICS INC Autry Irvine CA 92718714 830-8769 wood screw stop Dont omit screw will tear out balsa stop against screw nose plug place its blades folded either side motor tube determine best placement in spruce key locks nose block against rotation Zona saw cut away inner nose block ring key slot motor tube match photo will clarify operation Its im portant have two key points distri bute shock shaft striking screw prop has lot kinetic en ergy keys take quite load Its also good idea double motor tube covering material around key slots hooks seen photos proSMALL RIC HOBBY DEALERS! WE ARE DISTRIBUTOR KEYED TO YOUR PARTICULAR NEEDS information write call Southern Hobby Distributors 256 Madison Blvd Madison TN 37115 615 868-2100 1030 AM 500 PM CST peller blades made soft wire such paper clip Note location hooks somewhat aft hinge line blades folded rubberband hook goes over front Z-bar back other hook Change rubberbands before contest two reasons First its very important blades fold way back against mo tor tube stay way otherwise glide trim will thrown off Second rubberbands deteriorate very rapidly sun drafting triangle again using trusty worktable square check propeller blades track identical angle blade Also check static hAYALOISSRSSEOESASS DOGS X&.DIMS CONrAIl FUSE SIZE RECORDS MOM 97005 FATNDHASEOASSAMLM SHOE SOOTHEASTERN NE 19399AETELEHAS BEER ABE BOMBER AESOARIXSPETENRE vED LAER ER balance like Z-bar shown aluminum hub FAI Model Supply could substituted Cut small rudder tab about /a x 1 /2 trailing edge fin glue back place approximately /I6 left deflection small carpenters square check front end motor tube downthrust right thrust angles should about l should weigh about eight ounces ready fly 90 grams about three ounces contributed motor Oil propeller bearings lube motor youre ready fly Flight testing trim adjustment U3- Corter Rubber Band Powered He1icoper Flying repeatibillity coniStflt remult Flyn FOISWAI5D 5 gacewans nanEns TUESS CAM EBSI Fly IN TESTES HAD NO FEaTURES hPOHrrSApplitd BatS & Paper CENS$PEHIiON Setailed liSp ISep NStFOciiSflS 555tH pSPtS mE-COTinILLEM ASM AirIranse irreStly Sn FULL SIZE PLANS IS ISMS EESy ESSeFAIS / 7/ \T HhSlD 9O PD September 1990 183 Small Wonder ZAP UNIVERSITY COLLEGE OF GLUE KNOWLEDGE RONS MODEL Radio Controiled BUILDINGAirplanes Other Aircraft Boats 213 451-0414 ii Build Ry model should climb right turn glide left Glide controlled stabilizer tilt thickness aft incidence block Climb adjusted after satisfac tory glide trim has established Adjust climb small changes thrust line Thrust adjusted gently filing end motor tube change angle nose block rests very small increments Dont fly full power until youre completely satisfied models trim Make sure model climbs right turn avoid tendency loop hang prop power stall youre ready fly full power launch model about 450 angle tends go its pointed have flown few Conscientious Objectors just didnt want turn left glide ri diculous amount tilt stabilizer simply let turn right glide well climb Still unless really know what youre doing left glide right climb safe way go Dethermalizer accompanying photo dethermalizer shows its layout quite clearly guide tube under SHOC sta bilizer mount has multiple functions con ducts DT line keeps stabilizer rub bers touching line serves DT limit stop piece monofilament line can used DT line loop end fitted over peg top sta bilizer rubber must installed over loop stay place rubber loops over peg extends across leading edge stabilizer goes down around fuselage back up peg bit fuel tubing serves nicely DT line limit can tied line simple overhand knot adjusted strike line guide tube under SHOC mount tubing should adjusted allow about 450 stabilizer DT angle Tied other end DT line paper clip wire hook fuse rubberband extends hook across fuse around motor peg Use sharpened piece aluminum tubing drill holes fuselage makes cleaner hole does drill Use A-in tube fuse holder extending through both sides fuselage way can poke fuse material through piece wire can also pull out bit fuse case delay between lighting launching Glue tube firmly place heat sink can made alumi num can must selected care Ive used Coors Light cans cant say whether another brand would work well will gladly try answer questions might have about Conscientious Ob jector Send SASE 1902 Peter Pan St Norman OK 73072 responding advertisers mention read about Model Aviation Convert/McKinley Continued page 82 charge rather three some plan ning use small battery packs can aim think 20- 30-sec motor runs climb rates equal glow- ignition-powered models little no weight penalty Rally/Homer Continued page 88 forget did didnt fly AMA Rally Scobie Field Nor will other Houston modelers Bomber Field Club planning major event October Sev eral B-17s air simultaneously would something behold AMA Frequency Committee member George Steiner traveled Sacra mento CA teamed Bob Spivey Aus tin TX handle transmitter impound chores Charlie Marilyn Stevens Vance Dottie Wyman coordinated host local volunteers assist planning running event course rally would have possible efforts AMA HAMCI staff volunteers AMA Presi dent Don Lowe District VIH Vice Presi dent Gene Hempel AMA Executive Di rector Vince Mankowski hand Continued page 188 184 Model Aviation Caii Write 435 San Vicente Bivd J Santa Monica CA 90402 turn yoor printer lot oil plotter with.. FOILED AGAIN! C PLOT AIRFOILS IN ANY CIIORD u 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR 5HEETED WINGS ENTER DATA EASILY VIA INTELUGENT EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES 18-PAGE ILLUSTRATED U5ER MANUAL $45oo a cram prom slain ~2Z4i IiwflaihOO COopuV ira dot INI Clv conwaS potfli tWo w* irding ipioty 550 o 30 dOic Sm ram urocoy ordi CYGNET Software714 4966961 24843 Del Prado #141B Dana Point CA 92629 CAPACITIVE-DISCHARGE IGNITION SEA5 AMAN No moving parts No eng ne mod oat ons Basic unit $ 9995 Opposedcylinder twin $ 11995 ELECTRONIC CIRCUITRY REPLACES ANY MECHANICAL ADVANCE MAKES MAGNETO CONVERSIONS SNAPII
Edition: Model Aviation - 1990/09
Page Numbers: 74, 75, 76, 77, 180, 181, 182, 183, 184
Conscientious Objector Looking model can stand up rough-andtumble AMA Cate gory II Ill competitionand win robust rubber-powered Mul vihill good bet EBill Baker MOST MULVIHILL DESIGNS have published seem intended Category competition five-minute maxes judge relatively large fragile struc tures designed succeed events flown under AMA Category II III rules knew contests Id flying would involve windy weather small rough fields time Category II III rules would hold three- twominute flight times first three flights Conscientious Objector somewhat smaller typical Mulvihill design its also much less fragile model ca pable five minutes early morning air wont much good wing folds first windy flight gets beat shreds push five maxes just reach requirement five-minute max model competitive Id hoped will three minutes easily tactic fly early getting first three four flights before wind downdrafts strengthen try pick up some lift four- five-minute maxes Most competition will elim inated thensometimes can look back half-century model building Ive enjoyed being involved nearly facet hobby Ive flown CL RC mostly sport flier course have flown practically type Free Flight model known Most competition flying has Free Flight concentrating Gas events dropped out Free Flight about 1964 flew RC until 1976 Around time old Free Flight urge crept up again attended contest see what changed decided would fun learn new event like Rubber rather falling back old Gas groove happened long before Bob Dunham published Draft Dodger April 1975 issue Flying Models Id long awe Dunhams great-flying Rubber models Draft Dodger im mediately claimed interest Mass-produced Draft Dodger parts tum bled out workshop like Henry Ford cars point early process counted three wings five fuselages four stabs four props just keep two mod els flying competition surprise novice Rubber flier time models flew very well win ning contests 1979 started making few changes important rolled balsa tube fuselage did nothing im prove performance fuselage much less prone damage also rede signed wing mount modifications added up very practical Category Ill w model dubbed Conscientious Objec tor because wasnt exactly Draft Dodger anymore took both stock Draft Dodger newly evolved Conscientious Objector 1979 Nationals CO very high pitch prop giving longer slower climb contrast explosive power burst generated low-pitch prop Draft Dodger Wind conditions very strong blowing right across ocean corn two planes allowed event strat egy fly Draft Dodger first four flights knowing within three min utes would either corn OOS out-of-sight would likely lost fourth flight held Conscien tious Objector reserve fifthand hoped winningflight strategy worked though 74 Model Aviation Above The author showing off Conscientious Objector wheatfield near Norman OK No oil well background Isnt Bills probably wouldnt object owner bequeathed him Below authors iong-sufferlng hungry wife Paula holding up model show its lines promise lunch soon ordeal over Draft Dodger damaged after flight mostly wing mount damage diagonals broken out its explosive climb rate model flew through ground turbulence slower climbing Conscientious Ob jector wouldnt have able cope Still using tubular fuselage contin ued adapt Conscientious Objector un til virtually no remaining parts identi cal Draft Dodger guess difference between plagiarism research sources borrow adapted prop published years ago Frank Parmenter borrowed stabilizer structure Bob Whites Twin Fin also used simple Z-bar-type propeller hub copied wing mount few other ideas Jim OReilly invented better winding hook worked out sim ple reliable dethermalizer setup probably owes something lot differ ent people tried longer motor tubes va riety wings some area dif ferent dihedral schemes others differ ent airfoils experimented sev eral propellers model presented represents what judgment best compromise achieving key objective Mulvihill thats competitive Category III might want increase wing area 300 sq motor tube 42 model will serve flyoff five minute rounds Category may also want increase propeller diameter half-inch 95% Mulvihill flying done US model pre sented very competitive After 1979 AMA Nationals win Draft Dodger flew two Na tionals under Category III rules placed both third fifth time Conscientious Objector failed place Nats event surprise flown under Category rules As time went interests shifted Old-Timer events began attending SAM Champs instead AMA Nats Nevertheless continued well Conscientious Objector local re gional contests until found myself unable meet physical demands Free Flight competition present Im enjoying RC Sailplanes Conscientious Objector has permanent niche affections Id like think somewhere someone will flying Category III Mulvihill winning Construction motor tube fuselage houses mo tor also holds other parts air plane proper relationship another Though several fuselages built square cross section found tube config uration has best strength-to-weight ratio Use A6 x 4-in-wide 6- 8-lb A-grain balsa Make sure wood uniform density grain through entire length piece its much harder edge other transitions C-grain dont use Using metal straightedge trim sides true Seal wood side two coats Deft semigloss clear dope Sand gently between coats dry wet entire piece water will cause curl unpainted side expands Form wet balsa around 1 A-in-dia dowel after first scoring line down center dowel align balsa Largediameter dowels can procured hardware store lumber supply company believe theyre intended clothes closet hanging rods Jim OReilly once suggested using fluorescent tubes form motor tube Fearing would fall off ladder dur ing construction opted wood dowel Its also easier carve tail cone wood Ever try carving fluorescent tubing Wrap wood gently strips cloth gauze Ace bandage let dry Remove wood dowel apply Titebond along edges draw together Secure bits masking tape allow dry Make one-inch-wide nose doubler tail doubler about 1 wide simi larly prepared balsa doublers will Left Looking underside wing mount can see two lengths oil/a x 1A-in balsa used key wing pylon mount piece glued side wing pieces also serve fill gap between top pylon bottom undercambered wing Right Construction details wing mounting pylon side rails I/ x % spruce An easy way shape base pylon wrap sandpaper around motor tube sand pylon base perfect before final installation September 1990 75 Close-up view simple effective reliable dethermalizing mechanism motor peg tube fuse tube aluminum drink can heat sink can seen fuselage forward fin Small pieces %-in aluminum tubing serve guides limit line slip inside tube Glue place Titebond similar product sure let aft doubler protrude tube about youll have something glue tail onto tapered end forming dowel plane rasp easily form tail cone amount taper isnt crit ical 1 /4 narrowing 34 about right Make circular former hard -in balsa two cross-grained /16 pieces Fit former inside aft doubler end motor tube will prevent damage tapered cone should motor break Place another -in former area SHOC mount multifunction stabilizer mount attributed Sky Hoppers ange County California Dont worry rolled tube isnt per fectly circular Lay table allow roll until stops Let flat spot side top bottom 900 discernible curvature tube let concave side bottom joining tail cone eyeball closely can isnt perfect cone mount top forms straightest line motor tube motor pin must strong since tre mendous force exerted upon pin must course removable order change motors Use least A-in pin 1/2 SOFT BALSA WING TIP 9 SECTION DIHEDRAL BREAK RAISE T P 4 1/4 1 22I ZV LLI Ii 1/16 BAlSA SHEET 00155 DIGS 3/32OSIIRI S I/IA WIRESLIM ThBE RINK HOLE THIS LINE PARALLE 1/32PLYTO ESSE OF BLOCK PROP ERN n OCT COTTOM CC TOO TO MANO MRPOL SDOPE FRORT THIN TOrISOL CORNER TOIC4 TDICN AT HOC COIRT S THIRDSTOOL PROP BLADE CROSS SECTIONS NOT TO SCALE 3/32OIA3/5 015 HOLE HOLES /5 ALJMPJJM WINDING HOOK NOTE 3/64 TO 116 DOWN THRUST FOSELASE IS TJBE MADE BALSA SHEE 76 Model Aviation proplhub/nose block mechanism offset slot motor tube clearly seen offset makes impossible mount nose block upside down plastic press-on wheel collars attach blade Z-bar must leading edge theyll thrown off along blades creating lot noise very little thrust crashed airplane Another view prop/hub/nose block assembly showing doubled blade hinge assembly Zbar spring bearing motor hook Complete instructions carving blades nose block fashioning hub mechanism included text clearly detailed plan Finished aluminum hubs function just well can purchased through FAI Model Supply Wing jigs important especially mass-producing wings jig building wing shown plan background foreground jig polyhedral variant prop/hub/nose block assembly attached motor tube Note blades fold flush against tube its important fold way back against shown stay way during glide Otherwise glide trim will thrown off Full-Size Plans Available. See Page 196 I/IA I/A HALSA WEBS 1/B BALSA SPAR NO DIHEDRAL BREAK AT CENTER LINE WIN~ PlAN I4 SO BALSA LEADING EDGE DIHEDRAL BREAK RAISE WING TIP 4-1/4 imi~ _[-t___ OUBL TOP 0 3 -- F AR BALSA 29 OF UK BALSA GA HESHEAR WEE AT DIHEDRAL JO/AT LEL I/H HARD BALSA_ IM OP I/3D LEDIHEDRAL WING RIB PATTERN BRACEAIRFOIL IS DUNHAM-BARER- REEHOK 00KGOLDBERG PASTIC IDE OFZ AGR AS THE WHEEL OLLAR FAI MODEL SUPPLY RGLL TEREARING AND SPRINO 3D PLO NCE WREI/IA ID TUBE GAVB SPRUCE KES HEW WITH EMOVED NOSE/PROP DETAILI/IA BALSA SHEET S/A UPRJCE I/RBALSATF-I B F-B SHEET___________ F-234 aUNT WINS INCIDENCE 0 ICALE Ir\IIilIIIIITi~ F-I FOED CUFHF5 I/B 3/IA SPRCE RAILS / FUSELAGE SIDE VIEW I/H GO BALSA DOG BLER I/A BALSA SHEET GUSSETS /H SG RGLSA LE I/H SO EALSA DOUBLER I/A RALSA4 \JL/ N SHEET TP END IEW I/H BALSA SHEET RIBS AT DIHEDRAL BREAK 1/ H PLY I/IA BALSA VIA BALSA SHEET/64 PLO I/3D HALSA SHEET SHEAR WEBS STAB STAB DIAGONAL I/IA BA3A SHEET PROP BEARING DETAIL NO SCALE TWO I/H HALSA SHEETS CROSS URANED ALUM SODA CAN HEAT SINE BOTH I/A DIASIDES MOTOR PIN NOTE COMPLETE MODEL RTF WITH MOTOR THEN GLUE WING MOANT ON WITH ARKED ON WING MOUNT OVER ACTUAL C S I/B I/IA BALSA SPARS TOP AND BOTTOM STABILIZER VIE BALSA RIBS /8 50 BASA- TRANS EDGE I/IA HASA DI AS ON ALS I/H BALSA SHEET 1/4 BALSA INCIDENCE BLOCK-TRIM FOR RUDGER TAB -DD TO -3 INCID I/A EFT I/lA PLY SHOC MOUNT 1/H ALUM TUBE CRIMP ALUM TUBE 1/4 BALSA I/H BALSA I/ADD ALUM TUBE THRA FUSELAGE /16 BALSA SHEET DOURLER PAPER CLIPCRIMP ALUMTRACING BY OE DEMARCO HOOKTUBE MODEL ATION CONSCIENTIOUS OBJECTOR DESIGNED BY BILL BAKER reinforce tube holes made fin can made %-in light sheet balsa save weight cant find four- six-pound sheet built-up fin could used course would prone battle damage install fin lay tube its side flat table Block up fin books pieces wood its centered tube parallel table glue place As long fin parallel direction flight symmetry tail cone critical Ron Robertti once told tail aint straight retorted thing needs turn anyway Covering fuselage cover tubes tissue sometimes silk Ive also used polyester cloth intended dress making Its very tough comes pretty colors wrinkles can elimi nated through heat shrinking down side its little heavier other materi als next tube Id like try O6-oz fiberglass cloth clear dope adhe sive dont usually cover tail cones fins would use tissue did un covered areas including prop usu ally finished Deft semigloss wood filler/sealer available hardware store stabilizer quite conventional Its also lightweight trouble-free Note both leading trailing edges made A-in-sq stock Round off leading edge put slight taper trailing edge Beauty second ary lightweight warp-free construc tion model flying speeds slow wide sharply tapered trailing edge would simply excess weight Hence truncated trailing edges used both stabilizer wing Note point needed con nect both DT dethermalizer limit line front stab hold-down rubber Also note absence need sheet fill September 1990 77 Continued page 180 Three Mulvihill standouts author Bill Baker left George Perryman center Jim OReilly placed first second third both 1979 1982 AMA Nats ALL STAINLESS STEEL HEAD LITE IItm BEST GLOW PLUG CONNECTOR Stainless Steel HEAD LOCK BEST DESIGNAll Welded No Solder Acid Flux Flexing Wires BEST NiCadField Replaceable 12 AH SANYO 15 AH PANASONIC BEST QUALITY & GUARANTEE MODEL PRODUCTS CORPORATION BEST PRICESt #045-WIO NiCad Charger$ 995 available write directSt #040-With NiCad$ 1595 add $100 $200 outside US St #041-With NiCad & Charger $ 2595 MODEL PRODUCTS CORP RO Box 100 Allamuchy NJ 07820201850-1508 have coloring model planes using method years Unlike Floquil butyrate-jar skimming inexpensive food markets fabric outlets sell Rit dyethe powdered kind comes infinite variety colors can used straight blended just right color use baby food jars mixing Open pouch Rh dye pour few beads jar pour some dope thinner acetone top will surprised quickly thin ner snatches color dye Keep blending using raw balsa sticks test against color sam ple want match Once satisfied add about 20% clear dope mix always put couple thin coats clear dope model first prevent creeping Rit will give lively-looking color saving little jar will allow patching later Just add thinnerthere no pigment Work takes longer tell about FF Scale/Warner Continued page 73 Investigation problem turned up fact Federal Standard screwed up 1964 changed color standard original WW II olive drab new kept old number F534087 confuse modelers restorers make things worse Uncle Sam gave same number very dark brown olive drab March 1979 meant modelers three FS34087s choose January 1984 34087 reappeared original shade gloss semigloss versions OD dark brown version 1979 14087 24087 June 1984 GSA decided straight en things out issued change notice ef fect color chip 34087 dated March 1979 wrong color shall used colors 14087 24087 34087 represent two different colors lors have re numbered follows 14087 now 14084 24087 now 24084 34087 now 34088 makes five matte olive drabs pre-1964 34087 post-1964 34087 March 1979 34087 wrong color 1984 34087 1984 Change Notice 34088 same color later 34087 new FS595B being printed riht now should take care confusion right Dont count Don suggests build Navy aircraft forget about olive drab alto gether case its nice see company concerned about getting right Perhaps thats cause Don perfectionist kind person would balance wheel wheelbarrow Czech submarine contest high points life getting news what other modelers doing Id like share Lubomir Koutnys account contest Czechoslovakia likes drought-ridden Califor nians long Boys Zabreh north Moravia began arrange A0-scale contest little town did very well am sorry weather perfect submarine contest rain damp air very well Scale big perfect varnish like Straniks twin Batman won Other boys give Scales over hot car engine before next flight get idea guess spoiled re member flying guys southern France flew rain shine often packed model boxes cars after sunset Plastic vs rubber have hearing nasty rumors late rubber stored plastic con tainers may deteriorating accelerated rate might due outgassing plastic container have rubber stored type container length time under optimal conditions airtight out heat might want check out let know harm seems have done Im sure other readers would really happy know whether good way store precious rubber motors Well until next time guys gals always re member Dont dope models sandstorms things wont too rough Conscientious/Baker Continued page 77 stab lightweight aligns itseli small notch DT line tht trailing edge action SHOC-typt stab front mount centers leading edgc well enough negating need keying An added advantage system thaI its free move meeting obstruc Man turer Hi Performa utba$Is andraft CULPEPPER C MODELS INC 2526 Washington DubuqmIA 520411 31015834830 180 Model Aviation PRODUCTS FOR THE O4SCERNING MODELER FF Duration/Linstrum Continued page 71 Made America American Technology RJL Manufactures USA RJL RIG & U/C ENGINES 15 thru 61 Fot-ster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Coil wrte free information RJL Industries PO Box 5 Sierra Mack-e CA 91025 818 359-0016 Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers Helicopter Ball Mufflers ialized Exhaust Systems Unsurpassed Workmanshin & Perfomance Serious Horsepower3 0S ST YS Rossi & Webra Parts Service Custom Engines Accessories Dave Shade Performance Specialties Send $1 00for fully illustrated catalog Available VS Long & Short Stroke 06 Long Stroke 06 6IFSR 06 40 VRP/VF 06 91 VRDF STX-40 Rossi 40 coming soon mare information Call 619 729-1658 Hours 10 am 5 pm Monday Thursday P 0 Box 4003 sbad CA 92008 tion would break keyed stabilizer notched peg holds rubber DT line can made A6 ply popsi cle stick tongue blade wood dowel aluminum tubing peg mounting platform stabilizer should also /~ ply peg must able withstand certain amount strain Wing heavy-duty spar shown plans Ive never broken wing Maybe spar too heavy like up per main spar can made either very hard balsa spruce other spars can medium 8-10-lb balsa shear webbing between spars very important Installing pieces along centers spars shown plan ideal find making full depth locating along side easier adequate -in hard balsa angled center dihedral brace can also made full depth Shim up rib fronts A2 above leading edge small taper cut can made will shape leading edge conform undercambered ribs Shim up rear end ribs trailing edge A2 same reason wing can built jig youre going build several wings jig highly recommended jig used airplane allowed wing built piece except lower spar added air later use jigs dates discovery warps plagued induced during process adding dihedral dont usually shim washout since about washout seems occur auto matically tissue doped wing mount motor tube de signed lightweight rigid platform wing rest quick way achieve perfect fit wrap piece sandpaper around tube lightly sand mount base shape Dont glue wing mount fuselage until model ready fly must adjusted achieve correct CG center-of-gravity After mount glued place make sure theres enough stabilizer tilt produce left turn Propeller may try write detailed arti cle propeller carving soon sub ject has covered thoroughly else Wood selection primary impor tance block should hard about 14 lb uniform density produce blades both thin strong Lay out top bottom profiles making sure centerline top profile parallel edge block same bottom line side profile Set block drill press drill hole hinge Cut out profiles band saw Carve bottom blades first com pletely finishing before starting top sure keep track right left blades once carved six left-handed blades before realized what doing Thank fully wife saved day suggesting carve six right-handed blades Try about /16 undercamber midblade progressing no undercamber tip Begin carving top blade get ting down about A-in thickness Make high point airfoil its helpful mark about one-third chord Take time Carve thin slices chunks Shape blade aft high point sort triangular profile start final shaping leading one-third high point thickest part blade should about /16 tip midblade Add A4 A2 ply doublers /32 OD tubing hinge Place blade Z-bar hub drill holes limiting pins A6 drill mounted pin vice Take extreme care drilling holes blades track properly sight turning blades pro file should perfect alignment other Finish propeller Deft equivalent cant find Deft local hardware store Ive noticed listed Lee Campbells catalog nose plug made A-in sheet balsa laminated cross-grained first lam mate fits inside motor tube sec Electric Flight f Controller Perfect 05 Motors 510 cells 2mooth Has Brake Lightweight 12 Adjastobte switching pointssoney hock Soldertess tenssisot ror easy hookup guarantee ON/OFF Controller $2495 Power save weight very high efficiency ossty O06V loss 77 22x13x63 Colifoneejo residents add 65% $163 Tax Add $100 foe shipping Send Check money order wessaitiHigh Sky Futaha cossoetoc Kansas St #9 othn availableSan DiegoCA 92104 23rd consecutive year covering continues go easier & last longer rest Congratulations Super Coverite September 1990 181 JET bust completely finished authentically detailed poseable 1/8 scale Al QC1Ir pruu209 2244170 II p0 box 5631fresno Ca 93755 II ond should conform outside shape tube brass aluminum tube can inserted plug smaller pieces tubing approximately 1/8 long inserted end form bearings wire prop shaft Use Loc-Tite similar product adhere inner pieces tubing outer tube Use CyA cyanoacrylate glue install completed bearing nose block Add plywood face least large external ball bearing wont crush balsa Use good spring such available through FAI Model Sup ply Dont use ball-point pen spring other cheap alternative might take set Make Z-bar out A6 music wire Use Sta-Brite equivalent hard solder Never trust soft solder hold propeller hub together First balance Z-bar alone attach blades balance again used make batch blades pairmatch according weight simi larity As recall averaged eight 10 grams try dont get confused about right- left-handed blades did winding hook shown plan works quite well rubber will stay cen tered unless Newton wrong dont understand winding hooks winding tubes stooges other aspects rubberpowered model technology buy Don Ross book Rubber Powered Model Airplanes AMA Supply Service catalog motor made up enough 34-in strands weigh 85 90 grams dry Consis tency whats wanted should no slack used size motor Mulvi hills nearly Old-Timer Rub ber models such Lanzo Stick Korda Dethermalizer may able everything thing did learn wind motor consistently Trying get used different motors dif ferent models can very stressful con test time Life John Wayne says movie Iwo Jima tough its tougher youre stupid Keep simple Choose motor get used Youll make fewer stupid mistakes under pressure competition Trimming balancing center-ofgravity shown plan best allaround thermal windy weather flying flying early morning still air CG could moved slightly aft decalage reduced model designed stability reliability rather absolute max imum performance Set SHOC stabilizer mount about /l6 tail cone making careful cuts Zona saw removing wood tween cuts create flat spot sup port mount should tilt slightly right making left tip about er right wing mount should have no inci dence relative motor tube deca lage established angle stabi lizer sitting aft block under its trail ing edge angle should two three degrees about / higher trailing edge Glue wing mount place mo tor loaded making sure balancing mark 6ver CG Use large table square set wing mount square motor tube key gluing /16 x A-in balsa strips bottom wing across chord wing goes same position time cant shift dur ing flight will happen its left un keyed Key nose block assembly fuse lage bit A-in ply needed LANDER INDUST 1005 19TH ST CT HAYRE MONTANA 59601 4062656529 BUILDING BOARD 30x48 $4895 ncf 24 X 66. $6395 inc frI CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surface bonded 3/4 laminated warp tree base straight true work surface will last years years CHECK EM ALL OUT English Lcitlicr CALENOAR GIRL CNALLENGE 19 AUG AC MODELER NW 503 646-4531 PORTLAND OR 26 AUG JOES HOBBY CTR 313 933-6567 DETROIT Ml 9/22/23 CENTRAL PENN 717 564-3280 HARRISBURG PA $2500 STARHAWK FUN FLY NEW STARHAWK BIPLANE NEW MISS STARHAWK POSTER See Starhawk Dealer details write Thorpe Engineering Corporation 1715 E Fairfield Mesa AZ 85203 Poster $500 P&H Prepaid 182 Model Aviation Airtronics powerful 94141 Mian Servo strongest servo its size ever produced Compactly designed Ito provide max imum torque space restrictive RC applica tions precision ball bearing 94141 well suited types ahtraft Compatible Airtronics radio systems 94141 ideal use sailplane flaps ailerons formula pylon air craft electric R/C alitraft rued 94141 servo utilizes metal output gear coupled durable metal molded gear train Its reinfoned case features unique side mounting brackets allow easy horizontal servo place ment inside aircraft wings information about Airteunics quality pmducts please call write address above 94141 Specifications Part Number 94141 Description Precision High Torque Ball Bearing Micro Servo Dimensions L 137 36mm W 060ISmm H 127 325mm Weight118 oz 33 grins Torque 45 oz/in 32 kg/cm Transit Time 025 seconds 600 rocacion Equipped splined stand ard size servo arm 94141 features ball bearing supported output shaft high quality coreless motor advanced electronic componentry No cornparably sized lightweight servo matches superior strength high torque powerful performance Airtronics 94141 I\hcro Servo SetThe Standani jAIRTRONICS INC Autry Irvine CA 92718714 830-8769 wood screw stop Dont omit screw will tear out balsa stop against screw nose plug place its blades folded either side motor tube determine best placement in spruce key locks nose block against rotation Zona saw cut away inner nose block ring key slot motor tube match photo will clarify operation Its im portant have two key points distri bute shock shaft striking screw prop has lot kinetic en ergy keys take quite load Its also good idea double motor tube covering material around key slots hooks seen photos proSMALL RIC HOBBY DEALERS! WE ARE DISTRIBUTOR KEYED TO YOUR PARTICULAR NEEDS information write call Southern Hobby Distributors 256 Madison Blvd Madison TN 37115 615 868-2100 1030 AM 500 PM CST peller blades made soft wire such paper clip Note location hooks somewhat aft hinge line blades folded rubberband hook goes over front Z-bar back other hook Change rubberbands before contest two reasons First its very important blades fold way back against mo tor tube stay way otherwise glide trim will thrown off Second rubberbands deteriorate very rapidly sun drafting triangle again using trusty worktable square check propeller blades track identical angle blade Also check static hAYALOISSRSSEOESASS DOGS X&.DIMS CONrAIl FUSE SIZE RECORDS MOM 97005 FATNDHASEOASSAMLM SHOE SOOTHEASTERN NE 19399AETELEHAS BEER ABE BOMBER AESOARIXSPETENRE vED LAER ER balance like Z-bar shown aluminum hub FAI Model Supply could substituted Cut small rudder tab about /a x 1 /2 trailing edge fin glue back place approximately /I6 left deflection small carpenters square check front end motor tube downthrust right thrust angles should about l should weigh about eight ounces ready fly 90 grams about three ounces contributed motor Oil propeller bearings lube motor youre ready fly Flight testing trim adjustment U3- Corter Rubber Band Powered He1icoper Flying repeatibillity coniStflt remult Flyn FOISWAI5D 5 gacewans nanEns TUESS CAM EBSI Fly IN TESTES HAD NO FEaTURES hPOHrrSApplitd BatS & Paper CENS$PEHIiON Setailed liSp ISep NStFOciiSflS 555tH pSPtS mE-COTinILLEM ASM AirIranse irreStly Sn FULL SIZE PLANS IS ISMS EESy ESSeFAIS / 7/ \T HhSlD 9O PD September 1990 183 Small Wonder ZAP UNIVERSITY COLLEGE OF GLUE KNOWLEDGE RONS MODEL Radio Controiled BUILDINGAirplanes Other Aircraft Boats 213 451-0414 ii Build Ry model should climb right turn glide left Glide controlled stabilizer tilt thickness aft incidence block Climb adjusted after satisfac tory glide trim has established Adjust climb small changes thrust line Thrust adjusted gently filing end motor tube change angle nose block rests very small increments Dont fly full power until youre completely satisfied models trim Make sure model climbs right turn avoid tendency loop hang prop power stall youre ready fly full power launch model about 450 angle tends go its pointed have flown few Conscientious Objectors just didnt want turn left glide ri diculous amount tilt stabilizer simply let turn right glide well climb Still unless really know what youre doing left glide right climb safe way go Dethermalizer accompanying photo dethermalizer shows its layout quite clearly guide tube under SHOC sta bilizer mount has multiple functions con ducts DT line keeps stabilizer rub bers touching line serves DT limit stop piece monofilament line can used DT line loop end fitted over peg top sta bilizer rubber must installed over loop stay place rubber loops over peg extends across leading edge stabilizer goes down around fuselage back up peg bit fuel tubing serves nicely DT line limit can tied line simple overhand knot adjusted strike line guide tube under SHOC mount tubing should adjusted allow about 450 stabilizer DT angle Tied other end DT line paper clip wire hook fuse rubberband extends hook across fuse around motor peg Use sharpened piece aluminum tubing drill holes fuselage makes cleaner hole does drill Use A-in tube fuse holder extending through both sides fuselage way can poke fuse material through piece wire can also pull out bit fuse case delay between lighting launching Glue tube firmly place heat sink can made alumi num can must selected care Ive used Coors Light cans cant say whether another brand would work well will gladly try answer questions might have about Conscientious Ob jector Send SASE 1902 Peter Pan St Norman OK 73072 responding advertisers mention read about Model Aviation Convert/McKinley Continued page 82 charge rather three some plan ning use small battery packs can aim think 20- 30-sec motor runs climb rates equal glow- ignition-powered models little no weight penalty Rally/Homer Continued page 88 forget did didnt fly AMA Rally Scobie Field Nor will other Houston modelers Bomber Field Club planning major event October Sev eral B-17s air simultaneously would something behold AMA Frequency Committee member George Steiner traveled Sacra mento CA teamed Bob Spivey Aus tin TX handle transmitter impound chores Charlie Marilyn Stevens Vance Dottie Wyman coordinated host local volunteers assist planning running event course rally would have possible efforts AMA HAMCI staff volunteers AMA Presi dent Don Lowe District VIH Vice Presi dent Gene Hempel AMA Executive Di rector Vince Mankowski hand Continued page 188 184 Model Aviation Caii Write 435 San Vicente Bivd J Santa Monica CA 90402 turn yoor printer lot oil plotter with.. FOILED AGAIN! C PLOT AIRFOILS IN ANY CIIORD u 24 INCHES MODIFY THICKNESS CAMBER & TRAILING EDGE PLOT SKIN THICKNESS FOR 5HEETED WINGS ENTER DATA EASILY VIA INTELUGENT EDITOR USER-FRIENDLY MENU-DRIVEN OPERATION INCLUDES 18-PAGE ILLUSTRATED U5ER MANUAL $45oo a cram prom slain ~2Z4i IiwflaihOO COopuV ira dot INI Clv conwaS potfli tWo w* irding ipioty 550 o 30 dOic Sm ram urocoy ordi CYGNET Software714 4966961 24843 Del Prado #141B Dana Point CA 92629 CAPACITIVE-DISCHARGE IGNITION SEA5 AMAN No moving parts No eng ne mod oat ons Basic unit $ 9995 Opposedcylinder twin $ 11995 ELECTRONIC CIRCUITRY REPLACES ANY MECHANICAL ADVANCE MAKES MAGNETO CONVERSIONS SNAPII