NO OCR TEXT plane designed variableincidence stab auto-rudder re quires large amount negative stab incidence glide stab setting permitted CG placement responsible models good recovery characteristicsin conjunction rud der turn Stab tilt wont job plane version Humminbird VIT/AR should expected fly significant changes 35 engine set up flat backplate mount 00—no side thrust downthrust Under power angular dif ference betwen wing stab set about 1 0 slight amount left rudder necessary right main panel wing has /16 washin other panels being flat washin adds left rolling action helps keep planes nose up turns right under power Left This view shows ciean lines modei its smaii tubuiar fusciage made roiled balsa carbon fiber stiffeners running iengthwise between baisa laminations Right Though hand-held i about what youll see model l flight dis tinguished swept-back elliptical lines Green panels show up well against sky white wing tips easy see grass Len comorrum sisoimizer nouses ins arnnrmizr TUE nuur tub. mm IUIUUUU mium end dethermalizing stabilizer sliding up line Right Stab construction must beery win ihe thin airfoil curved trailing edge made slitting balsa bending around pins gluing isa stab lighter Class version Before covering weighed 19 grams Left Authois homemade timer plate uses reliable K-Mart camera timer front wire flood-off bottom line monofila ment rudder release top spring stab trip Note adjustable metal piate determines height stab trip Right Humminbirds half-cowl produces neat front end helps streamlining Note restraint line flood-off attached tothe engine Oversized intake maximizes power benefits pressurefuel supply Landing skid fits behind backplate mount April 1986 77 Rolled-tube fuselage under construction Carbon fiber strips being applied 1/16 sheet balsa Second lamination already has shaped sliding over first layer glide circle medium-large right Humminbird designed Cat III flying fast climb essen tial has kind power pattern will hold longer engine runsand kind glide will give other designs hard time other categories Fuselage rolled tube strong crush proof light will warp make tube 48 long two sheets A6 x 4 x 48-in A-grain balsa final weight tube will slightly weight two sheets started use sheets weighing 24 28 grams com pleted tube comes out 55 60 grams Following procedure making rolled tube fuselage Coat pool cue stick neutral color shoe polish wax clamp big end vise stick can used mandrel Spray side balsa sheets water wifes spray bottles handy Let soak few minutes spray again balsa pliable mold sheet around stick use light pressure wont crack Re strain wrapped balsa several 6-in strips masking tape tape will stick itself wet balsa wrap balsa elastic anlde ban dage remove masking tape wrap wood will dry about three hours will need two molded tubes will call B Remove bandage Lay metal straightedge along Tube balsa overlaps cut through both layers Remove excess wood slide tube slightly up mandrel pool cue get best fit seam position fasten Left Author fills homemade metal tank 11/4 oz high-nitro fuel Decorative trim cut out Super MonoKote main MonoKote covering must adhere well balsa surfaces using moderate pressure hot iron prevent warping Modified geo detic wing construction provides needed torsional rigidity Right Under construction can see half-cowl details Strip wood bent around firewall attached ply nose piece temporarily glued back engine spinner alignment 78 Model Aviation wing framework seen trom under side Extra front diagonal brace usually needed Itwas added instance because balsa lighter usual top spar laminated carbon fiber DETAIL edges together cyanoacrylate glue CyA Remove tube mandrel gently twisting back forth probab ly wont straight Feed tube back onto mandrel sand seam fill gaps soft Full-Size Plans Available. See Page 164 balsa cut seven strips pre-cured carbon fiber 3A2 wide 48 long CyA-glue strips evenly-spaced inter vals run length tube straight lines Sand strips 220-grit block Slide Tube B dry uncut over Tube Pull together tightly masking tape cut seam overlaps limiting cut Remove Tube B paintthe inside slow-curing epoxy thinned denatured alcohol consistency thick dope paint outside Tube two coats Slide Tube B back over Tube wrap elastic bandage seam will meet perfectly everywhere ignore let lamination cure least overnight Remove bandage next day fit soft balsa seam gaps Sand leaving seam full balsa dust apply CyA glue will notice some little longitudinal humps caused imbed ded carbon fiber strips Hold 180-grit sand paper hand twist tube other hand sand around circum ference careful let sandpaper edges gouge wood finish tube first coat two coats dope Mist-spray sheet %-oz fiberglass cloth dope will cut easily scissors Stick cloth tube thinner After dries thorough ly apply two coats clear epoxy paint fill grain cloth entire tube-building procedure can done two three hours working time will have find other things between different steps setting up round fuselage draw centerline down left side tube will need reference mounting firewall straight setting correct incidence pylon Engine mount installation power plant needs installed first Cut 116 dia round firewall -in plywood Cut backplate mount 1 diameter 342-in aluminum plate Remove engines backplate center over alu minum mount mark four backplate holes drill size Attach backplate newly-drilled mount engine checking fit Locate four points near edge mount can drill holes attach mount firewallfar enough April 1986 79 Close-up K&B 35 engine shows radial backplate mount shaved lugs Bottom tubing attached pressure tap ilnes up crankshaft opening little device sounds steady beep guide right plane Easily mounts smallest planes Use connector plug receiver same servo Also tells someone frequency solid state crystal oscillator Comes ready mount full structions included WT 1 oz DIM 1 x 2 3/8 x IN USA CLUB DISCOUNTS AVAILABLEI * ASK * SEND CHECK OR MONEY ORDER TO ELECTRONIC DESIGNS INC BOX Z 1925 GREENWOOD LK TPK HEWITT NEW JERSEY 07421 PHONE 201 728-1616 Pius $200 Shipping cant USA NJ Residents add 6% Sales Tax COD add $200 Allow 2 wks Shipping engine heads hex screws will clear side engine puts screw heads almost edge mount Remove mount en gine drill four marked holes 440 hex bolts align aluminum mount over firewall Drill through firewall using mount guide put 4-40 blind keeper nuts behind firewall Its good idea put some Vaseline nut threads some point will have drill shallow holes firewall make room heads engine backplate bolts Provisions fuel tank should made before going further built round metal tank hold 1 oz fuel has pressure line front top two lines going bottom rearone fuel feed other engine flood-off prefer pen bladder pacifier tank should build fuel-proof oompart meat tube point Seal wood epoxy glue cover well clear epoxy paint glue will stand up raw high-nitro fuel install firewall system first cut -in-thick hard balsa block fit snugly inside tube epoxy block rear firewall engine mounting plate attached firewall straightedge mounted place prop align engine centerline tube epoxy-glue firewall engine still attached will have cut off engine lugs plan use halfcowl backplate mount dont like backplate mount conventional aluminum beani mount will work fine will give front end crowded will also about 20 grams heavier convert beam mount note will need shift pylon forward about t tail surfaces forward same amount maintain same moments either mounting system bend skid Lon top sink firewall held place mount will twist Pylon Build over plans noting four main supports made spruce go way bottom tube aluminum wing plate bevel underside edges improves stream lining over traditional full-length wood mount held pylon two 4-40 flat-head screws countersunk alu minum anchored blind nuts small threaded aluminum bar inside pylon pylon skeleton sheeted -in medium balsa two small A2 ply dou blers added outside sheeting under neath aluminum wing plate support top pylon has small plywood insets front back accept holes blind wing keys pylon longer wing chord allow wing find its natural resting place tied down rubberbands should keyed position Continued page 152 80 Model Aviation p ONLY MODEL SUPPLY w%4 203 5750916 Flight-Proven Designs Tep 203 3931990 Balsa ConstructIon 56 lbs Cessna 150 40 Powered 62 sy ConstructIon 110-16 hrsJ Stable PIlars Mooney 40 Powered 62 le Uk Appearance Slow PlyIng CapabIlItIes Cherokee 40 Powered 60 ea plus $250 UPS /e Scale test Proven place Cherokee 200 plus 600 shIppIng Ken Barnes Cessna 15025 Powered 50 plus *250 UPS NEW Firemaster Bipa56 6A-7 lbs. 60 Powered 6996 llntroductory PrIcel NEW Pack Kat 25 powered sport flyer low wIng span 44 Intro PrIce $2600 MasterCard e VISA Coming Soon 60 Powered Pattern Ships Dealers Invited S aV0 Old limer0 psrtS 0jqU La syatteS Chel1WOlFrom this. - to riorS Point6 InltioZ Engine Parts Only Over 600 items Send $200 current catalog PRO TECHTOR PRO GMOUNT painted black finishing touches have put its time attach engines Make sure put offset washers under both engines per plans assure proper line tension have doubts about engines put stronger inboard side After mounting engines check sure model balances CG point shown plans Balancing front point nose-heaviness okay add nose weight balances aft tail-heaviness Flying Use 35-ft steel lines Start inboard engine first outboard doesnt hurt run outboard engine tad rich side both engines running top off fuel inboard engine helps ensure outboard engine will run out fuel first both engines running model will jump air after short takeoff run flies fairly fast reasonably maneuverable model has no problem flying engine although maneuvers should attempted stopped model designed use two 049 Cox Babe Bee engines though other va rieties Cox 049 engines could sub stituted fact pictures show different engines first day test flying Babe Bees developed fuel leak replaced Babe Bees two other Cox 049s Black Widow Dragon fly replacements provided some extra power longer running times though no doubt plane would fly almost well Babe Bees model has met expecta tions enjoy sound two engines synch ability model make fast laps ground holding downelevator before taking off Twins lot fun model easy way try twin minimum investment FF Indoor/Tenny Continued page 74 prop driven few turns short motor sure problem caused shaft/spar joint having brok en loose Correct other problems find tweaking wherever necessary Automatic-centering hooks can made ways favorite shown Figure 2 side view shows traditional round hook shaft centerline passing through center hook end view shows form back edge hook curve bend tends force rubber toward center hook rather riding up crooked knot hook easily formed using round nose pliers make round hook Dashed lines side view show grip hook conventional needle-nose duck-bill pliers form S curve Align tips round-nose pliers shaft centerline twist clock wise make 5 curve take two tries get just right curve since music wire tends spring back After getting 5 curve just right inspect hook closely sure alignment has changed Use prop-pitch gauge measure pitch both blades sure both blades same angle gauge adjustable check pitch angles two three places blade sure blade twist equal both blades photos shows adjustable prop-pitch gauge being used check setting torque-variable-pitch prop care make own gauge note following features 1 The prop shaft provided fixed reference point insure exact meas urements 2 Provision made measure blade angle one-inch intervals Both blades must checked same radius angles must match closely 3 The blade-angle protractor should have increments degree con structed solidly enough insure repeat able measurements Repairs made damaged prop blades must carefully made avoid changes stiffness structure particular application skin glue fracture prop spar can affect flaring char acteristics prop Cyanoacrylate glue can also stiffen structure unless used sparingly Finally damaged all-balsa blades must very carefully repaired restore exact blade shape Two other photos show two extremes illustrate concepts involved Boston ian prop very deep camber curv ature Any damage changes camber will obviously affect well prop runs will incautious application glue shrinks thereby pulling additional camber photo Stan Chiltons Easy Bs gives clear view full-length prop spars Stan uses very soft light wood sanded very thin prop blades full-length spar necessary control blades under power allow model ceilingscrub damaging prop blades Repair type prop very delicate must done block used build prop initially Next time prop wobble issue will carried construction techniques minimize prop wobble other ineffi ciencies Bud Tenny PO Box S4S Richardson TX 75080 Humminbird/Caton Continued page 80 use straightedge find mark atop centerline tube lay straight piece wood almost thickness pylon along top centerline sight down toward tail aid checking alignment satisfied mark side straightedge cut through tube pylon will fit hole Note part tube above tank com partment should cut walls pylon will have fitted top tube area two spruce supports straddling tank compartment very important step setting proper incidence pylon Measure top rear pylon centerline side tube rear 152 Model Aviation TRANSMITTER CASE. trong thermo molded metal framed soft foam filled 901205 carryIng case best market SCans mitter Price 3250 Add 5250 shippIng Alaska Hawaii 450 ENGINE MOUNTS. fully machIned 6061T6 alsmlns brIghtly pellshof reteiSed mounting holes 60s 1205 Os 61000161 6581 OPt 60 VS 61 115 Os 60 50 90 Enya 60 los cyslos 122 Soya 90120 OS 120 foor sysles $25 Add 1150 ship Ca AK & III 5300 FIBERGLASS COWLS 70 cowls eelpants Sig Pica Top-Filte Jemco Nosen Pilot Stafford Radlais Behrens Garmhausen W E Tech other kits plans Onepiece laminated construction handlaid fIberglass strong hut lightweight Send BASE price list please Include names models interested parts br call between 9AM 9 PM EDT information COD ordering hope hear yout 5IBERGLASS ASTER 703 890-6017 Ospi MA 59 1 1st 530 Goodviec VA 24095 SASE FOR FREE cATALOGcA RESADD6 BERGERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 us can get completely true-running prop single bearing Shaft/spar misalign ment can spotted easily side TOLEDO THIRTY-SECOND ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 11 12 & 13 1986 presented Weak Signals R/C Club Toledo Ohio Exposition information available contacting Wayne Yeager co-director ticket address shown below ADVANCE TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon instead stamps Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $4 QOperday adults $100 per day children 12 under Ticket sales final non-refundable tickets along program will returned near mid-March COMPETITION CLASSES NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models HELICOPTER R/C CAR COMPETITION BOAT MILITARY SCALE BOAT PLEASURE POWER BOAT WORKING VESSEL-UNARMED distance should 31/16 measure top front pylon centerline front should 3 important thing relationship measurements front pylon should 1/16 %4 higher rear Get good pylon fit making sure main supports touch bottom tube Dont glue place yet Half-cowl Building straightforward hard select aluminum spinner backplate size want front cowl Make round piywood nose piece 2 ply sheet cutting just slightly larger spinner backplate cut large hole engine shaft pass through Tack-glue 1/n-in spacer spinner backplate Glue plywood nose piece spacer mount engine complete prop nose piece will become front end cowl already its final position proper spinner clearance Note firewall larger tube Wrap tube layer 1/16 balsa fill area fill extending about 2 back beveled rear construct cowl stringers first cut three strips spruce 6 long Run first strip nose piece down centerline left side tube CyA-glue spots holding place apply slow-curing epoxy around firewall stress points Repeat right side tube bottom produces outline cowl can filled medium balsa After stringers press soft balsa gaps hold CyA glue usually apply some thin slow-curing epoxy point make sure bond close remaining cracks strong filler Sand cowl its final shape coarse sandpaper block bringing front end down size spinner fairing rear stringers tube note will have able get angled Allen wrench between side cowl engine reaching mountingbolts Plan forthis bend spruce stringers around engine now has no lugs Place temporary spacer between side engine spruce maintain access space Wing beefy modified geodetic structure front sheeting take load hot climb top spar wings high point medium-hard /z6 sq balsa pre-cured carbon fiber CyA-glued top bottom make rigid resist impacts dethermalizing ribs cut 4-to 6-lb /32 sheet balsa feel wood little heavy can step down 1Ae sheet wing tip ribs 1/16 top sheeting leading edge over high point spar should weigh about 11 13 grams per 3 x 36-in sheet construction sequence use Notch trailing edge pin over plans Laminate leading edge pin down Pin bottom spar place Use piece Y16 sq wood make sure notches ribs deep enough set ribs over bottom spar ribs too long too short make adjust ments leading trailing edge CyA-glue ribs place add top spar end ribs wing panel can slanted match angle dihedral breaks cut some templates angle can establish correct di hedral build eliminate awful chore trying sand later Add webbing leave off center make room plywood brace will added later wing halves joined Fit glue rear diagonals leaving off front diagonals time being Mark cut 1/16 leading edge sheeting Tack-glue sheet front back rib remove wing plans can make sure sheeting straight along leading edge before gluing com pleted will help avoid washboard effect Continue attaching sheeting ribs CyA giue wing upside down front diagonals can cut trimmed conform contour sheeting wing tip construction same main panel except making An exact scale reproduction worlds successful Ultra Light aircraft Same material construction full scale aircraft Light enough electric power info pack send $1 stamped self ad dressed envelope Gene C Head aRt 10 Box 342 S Portsmouth KY 41174 April 1986 153 READY NOW Modelers Choice GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz $595 Kwik Set 6 Minute10 Os $995 Giant Kwik Set 6 Minute16 os$1395 Half FastlOMinutelOoz$995 GMP AIRCRAFT INSTRUMENTS 80 31161143181/2$ 149 40 3/4 inch $ 149 EASY OFF PULLER proper tool removing drive washeraand flywheels $ 795 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 513 385-7398 net year duder engr irect Fast B fluid add $150 020 Engines Free-Flight Rubber Pulse small Multi Channel R/C systems suitable 50 years ago mas very capable aircraft usell $2195 proportiosed stable model fligOt interestiog desigs boding itself balsa Structural techoigues KIT 002 Weve got eflole sour lavorites Please seed 505 Flyllee CetolegPhOne 17031 273-9093 Scalers 0113 OiStrnulerS ruimed FLYLINE MODELS INC PO Box 2136 Fairfax virginia 22031 curved leading trailing edges Stick about dozen pins behind leading edge plan line bend strip wood around pins Add next lamination tackglue place bend around curve leave strips extra length can bent around curve easily form trailing edge use straight edge cut about four slits outermost eight inches bend strips time around pins Again helps have extra wood length Both leading trailing edges should removed sanded flat before proceeding same con struction sequence used main panel fitting curved top sheeting easy turn tip upside down over sheet use fine-tip pen mark sheet along curve leading edge along curve aft side high point spar Cut out along outside marks fit place After panels built before joined together roughly trim leading edge knife leaving enough can form final shape coarse sandpaper block accuracy front airfoil freehand proposition easy become tired happens put work aside until later Im fresh enough give atten tion deserves trailing edge will need some coarse sanding bring down size overall sanding shaping wing can done large sanding block about 4 x 9 inso high spots along diagonals sheeting can brought line ribs airfoil references point Sandpaper 220-grit works well final smoothing can done 400-grit paper Join tips main panels 5min epoxy check again correct amount dihedral youve made mistake can heat epoxy covering iron until begins gas off will release outer joints have no brace just cover front joint back spar 34-oz glass cloth clear epoxy paint same top bottom trailing edge put two coats dope spot covered stick down glass thinner After dries use clear epoxy paint double cloth weight wing center section after inserting carbon fiber brace leading trail ing edges Once wing joined center cut out plywood wing support counter sink 6 bottom wing structure Next add main ply dihedral brace also serves foundation wing support Add 1/32 plywood braces around center rib spars making sure extend past end wing support run almost full height rib Use epoxy assembly because takes wing load dethermalized landings Stabilizer Construction identical wing word about weight might helpful try use 9- 11-gram sheet wood ribs top sheeting desirable have finished weight uncovered stab structure under 1 oz makes CG much easier control stab comes out heavier want cover lighter polyester film can reduce tail weight much 10 grams choosing lightest covering Setting up final assembly After cov ering wing stab temporarily mount everything rudder stab mount en gine prop pylon wing stab hold together rubberbands Place piece masking tape over center wing mark 68% chord hang model rubberbands Shift pylon slightly fine-tune proper CG remember slide stab pylon keep same moment relation ship set CG 2% 3% ahead 68% because paint final finishing usually move about amount Its time glue pylon epoxy stab mount vertical fin cover fin pylon half-cowl oz glass cloth because easier put good finish cloth cover up wood grain After sticking cloth dope thinner put two coats clear epoxy paint After dries mix dope talcum powder fairly thick grainy consistency paint two three coats dries hour less Sand off filler 220-grit paper repeat filler application/sanding until looks smooth ending up 320 400-grit paper fuselage sprayed epoxy color paint withstand high nitro fuels number VIT arrangements will work well shown photos dependable pull rubberbands tight stab endand have enough tension spring timer hold stab down under power stretching rubberbands hold stab trip line DT release No matter system someone new VIT chooses please understand require careful attention engineerin testing aspects possible something hang up pull loose can count happening Anything suspect needs changed anything changed needs tested 10 times today 10 times tomorrow want faster plane independent power glide trim VIT/AR way go Test flying Make sure engine run ning reliably test flood-off system VIT again before trying fly Check Y16-in washin right main panel Test glide slight left turn power settings enough negative stab incidence keep plane diving hand glide Use instant DT set 2-sec delay set 2- 3-sec engine run launch high right wing slightly low trim prop plan compete run engine peak rpm because trimming slow props rich engine means will have over again start going fast get ready let plane glide remember requires quite bit additional negative stab incidence Mine uses about er should trip right glide built first high-performance model article like Ive loved fast Free Flight ever since decide build Humminbird put some green somewhere help prove green airplanes fly 154 Model Aviation
Edition: Model Aviation - 1986/04
Page Numbers: 76, 77, 78, 79, 80, 152, 153, 154
NO OCR TEXT plane designed variableincidence stab auto-rudder re quires large amount negative stab incidence glide stab setting permitted CG placement responsible models good recovery characteristicsin conjunction rud der turn Stab tilt wont job plane version Humminbird VIT/AR should expected fly significant changes 35 engine set up flat backplate mount 00—no side thrust downthrust Under power angular dif ference betwen wing stab set about 1 0 slight amount left rudder necessary right main panel wing has /16 washin other panels being flat washin adds left rolling action helps keep planes nose up turns right under power Left This view shows ciean lines modei its smaii tubuiar fusciage made roiled balsa carbon fiber stiffeners running iengthwise between baisa laminations Right Though hand-held i about what youll see model l flight dis tinguished swept-back elliptical lines Green panels show up well against sky white wing tips easy see grass Len comorrum sisoimizer nouses ins arnnrmizr TUE nuur tub. mm IUIUUUU mium end dethermalizing stabilizer sliding up line Right Stab construction must beery win ihe thin airfoil curved trailing edge made slitting balsa bending around pins gluing isa stab lighter Class version Before covering weighed 19 grams Left Authois homemade timer plate uses reliable K-Mart camera timer front wire flood-off bottom line monofila ment rudder release top spring stab trip Note adjustable metal piate determines height stab trip Right Humminbirds half-cowl produces neat front end helps streamlining Note restraint line flood-off attached tothe engine Oversized intake maximizes power benefits pressurefuel supply Landing skid fits behind backplate mount April 1986 77 Rolled-tube fuselage under construction Carbon fiber strips being applied 1/16 sheet balsa Second lamination already has shaped sliding over first layer glide circle medium-large right Humminbird designed Cat III flying fast climb essen tial has kind power pattern will hold longer engine runsand kind glide will give other designs hard time other categories Fuselage rolled tube strong crush proof light will warp make tube 48 long two sheets A6 x 4 x 48-in A-grain balsa final weight tube will slightly weight two sheets started use sheets weighing 24 28 grams com pleted tube comes out 55 60 grams Following procedure making rolled tube fuselage Coat pool cue stick neutral color shoe polish wax clamp big end vise stick can used mandrel Spray side balsa sheets water wifes spray bottles handy Let soak few minutes spray again balsa pliable mold sheet around stick use light pressure wont crack Re strain wrapped balsa several 6-in strips masking tape tape will stick itself wet balsa wrap balsa elastic anlde ban dage remove masking tape wrap wood will dry about three hours will need two molded tubes will call B Remove bandage Lay metal straightedge along Tube balsa overlaps cut through both layers Remove excess wood slide tube slightly up mandrel pool cue get best fit seam position fasten Left Author fills homemade metal tank 11/4 oz high-nitro fuel Decorative trim cut out Super MonoKote main MonoKote covering must adhere well balsa surfaces using moderate pressure hot iron prevent warping Modified geo detic wing construction provides needed torsional rigidity Right Under construction can see half-cowl details Strip wood bent around firewall attached ply nose piece temporarily glued back engine spinner alignment 78 Model Aviation wing framework seen trom under side Extra front diagonal brace usually needed Itwas added instance because balsa lighter usual top spar laminated carbon fiber DETAIL edges together cyanoacrylate glue CyA Remove tube mandrel gently twisting back forth probab ly wont straight Feed tube back onto mandrel sand seam fill gaps soft Full-Size Plans Available. See Page 164 balsa cut seven strips pre-cured carbon fiber 3A2 wide 48 long CyA-glue strips evenly-spaced inter vals run length tube straight lines Sand strips 220-grit block Slide Tube B dry uncut over Tube Pull together tightly masking tape cut seam overlaps limiting cut Remove Tube B paintthe inside slow-curing epoxy thinned denatured alcohol consistency thick dope paint outside Tube two coats Slide Tube B back over Tube wrap elastic bandage seam will meet perfectly everywhere ignore let lamination cure least overnight Remove bandage next day fit soft balsa seam gaps Sand leaving seam full balsa dust apply CyA glue will notice some little longitudinal humps caused imbed ded carbon fiber strips Hold 180-grit sand paper hand twist tube other hand sand around circum ference careful let sandpaper edges gouge wood finish tube first coat two coats dope Mist-spray sheet %-oz fiberglass cloth dope will cut easily scissors Stick cloth tube thinner After dries thorough ly apply two coats clear epoxy paint fill grain cloth entire tube-building procedure can done two three hours working time will have find other things between different steps setting up round fuselage draw centerline down left side tube will need reference mounting firewall straight setting correct incidence pylon Engine mount installation power plant needs installed first Cut 116 dia round firewall -in plywood Cut backplate mount 1 diameter 342-in aluminum plate Remove engines backplate center over alu minum mount mark four backplate holes drill size Attach backplate newly-drilled mount engine checking fit Locate four points near edge mount can drill holes attach mount firewallfar enough April 1986 79 Close-up K&B 35 engine shows radial backplate mount shaved lugs Bottom tubing attached pressure tap ilnes up crankshaft opening little device sounds steady beep guide right plane Easily mounts smallest planes Use connector plug receiver same servo Also tells someone frequency solid state crystal oscillator Comes ready mount full structions included WT 1 oz DIM 1 x 2 3/8 x IN USA CLUB DISCOUNTS AVAILABLEI * ASK * SEND CHECK OR MONEY ORDER TO ELECTRONIC DESIGNS INC BOX Z 1925 GREENWOOD LK TPK HEWITT NEW JERSEY 07421 PHONE 201 728-1616 Pius $200 Shipping cant USA NJ Residents add 6% Sales Tax COD add $200 Allow 2 wks Shipping engine heads hex screws will clear side engine puts screw heads almost edge mount Remove mount en gine drill four marked holes 440 hex bolts align aluminum mount over firewall Drill through firewall using mount guide put 4-40 blind keeper nuts behind firewall Its good idea put some Vaseline nut threads some point will have drill shallow holes firewall make room heads engine backplate bolts Provisions fuel tank should made before going further built round metal tank hold 1 oz fuel has pressure line front top two lines going bottom rearone fuel feed other engine flood-off prefer pen bladder pacifier tank should build fuel-proof oompart meat tube point Seal wood epoxy glue cover well clear epoxy paint glue will stand up raw high-nitro fuel install firewall system first cut -in-thick hard balsa block fit snugly inside tube epoxy block rear firewall engine mounting plate attached firewall straightedge mounted place prop align engine centerline tube epoxy-glue firewall engine still attached will have cut off engine lugs plan use halfcowl backplate mount dont like backplate mount conventional aluminum beani mount will work fine will give front end crowded will also about 20 grams heavier convert beam mount note will need shift pylon forward about t tail surfaces forward same amount maintain same moments either mounting system bend skid Lon top sink firewall held place mount will twist Pylon Build over plans noting four main supports made spruce go way bottom tube aluminum wing plate bevel underside edges improves stream lining over traditional full-length wood mount held pylon two 4-40 flat-head screws countersunk alu minum anchored blind nuts small threaded aluminum bar inside pylon pylon skeleton sheeted -in medium balsa two small A2 ply dou blers added outside sheeting under neath aluminum wing plate support top pylon has small plywood insets front back accept holes blind wing keys pylon longer wing chord allow wing find its natural resting place tied down rubberbands should keyed position Continued page 152 80 Model Aviation p ONLY MODEL SUPPLY w%4 203 5750916 Flight-Proven Designs Tep 203 3931990 Balsa ConstructIon 56 lbs Cessna 150 40 Powered 62 sy ConstructIon 110-16 hrsJ Stable PIlars Mooney 40 Powered 62 le Uk Appearance Slow PlyIng CapabIlItIes Cherokee 40 Powered 60 ea plus $250 UPS /e Scale test Proven place Cherokee 200 plus 600 shIppIng Ken Barnes Cessna 15025 Powered 50 plus *250 UPS NEW Firemaster Bipa56 6A-7 lbs. 60 Powered 6996 llntroductory PrIcel NEW Pack Kat 25 powered sport flyer low wIng span 44 Intro PrIce $2600 MasterCard e VISA Coming Soon 60 Powered Pattern Ships Dealers Invited S aV0 Old limer0 psrtS 0jqU La syatteS Chel1WOlFrom this. - to riorS Point6 InltioZ Engine Parts Only Over 600 items Send $200 current catalog PRO TECHTOR PRO GMOUNT painted black finishing touches have put its time attach engines Make sure put offset washers under both engines per plans assure proper line tension have doubts about engines put stronger inboard side After mounting engines check sure model balances CG point shown plans Balancing front point nose-heaviness okay add nose weight balances aft tail-heaviness Flying Use 35-ft steel lines Start inboard engine first outboard doesnt hurt run outboard engine tad rich side both engines running top off fuel inboard engine helps ensure outboard engine will run out fuel first both engines running model will jump air after short takeoff run flies fairly fast reasonably maneuverable model has no problem flying engine although maneuvers should attempted stopped model designed use two 049 Cox Babe Bee engines though other va rieties Cox 049 engines could sub stituted fact pictures show different engines first day test flying Babe Bees developed fuel leak replaced Babe Bees two other Cox 049s Black Widow Dragon fly replacements provided some extra power longer running times though no doubt plane would fly almost well Babe Bees model has met expecta tions enjoy sound two engines synch ability model make fast laps ground holding downelevator before taking off Twins lot fun model easy way try twin minimum investment FF Indoor/Tenny Continued page 74 prop driven few turns short motor sure problem caused shaft/spar joint having brok en loose Correct other problems find tweaking wherever necessary Automatic-centering hooks can made ways favorite shown Figure 2 side view shows traditional round hook shaft centerline passing through center hook end view shows form back edge hook curve bend tends force rubber toward center hook rather riding up crooked knot hook easily formed using round nose pliers make round hook Dashed lines side view show grip hook conventional needle-nose duck-bill pliers form S curve Align tips round-nose pliers shaft centerline twist clock wise make 5 curve take two tries get just right curve since music wire tends spring back After getting 5 curve just right inspect hook closely sure alignment has changed Use prop-pitch gauge measure pitch both blades sure both blades same angle gauge adjustable check pitch angles two three places blade sure blade twist equal both blades photos shows adjustable prop-pitch gauge being used check setting torque-variable-pitch prop care make own gauge note following features 1 The prop shaft provided fixed reference point insure exact meas urements 2 Provision made measure blade angle one-inch intervals Both blades must checked same radius angles must match closely 3 The blade-angle protractor should have increments degree con structed solidly enough insure repeat able measurements Repairs made damaged prop blades must carefully made avoid changes stiffness structure particular application skin glue fracture prop spar can affect flaring char acteristics prop Cyanoacrylate glue can also stiffen structure unless used sparingly Finally damaged all-balsa blades must very carefully repaired restore exact blade shape Two other photos show two extremes illustrate concepts involved Boston ian prop very deep camber curv ature Any damage changes camber will obviously affect well prop runs will incautious application glue shrinks thereby pulling additional camber photo Stan Chiltons Easy Bs gives clear view full-length prop spars Stan uses very soft light wood sanded very thin prop blades full-length spar necessary control blades under power allow model ceilingscrub damaging prop blades Repair type prop very delicate must done block used build prop initially Next time prop wobble issue will carried construction techniques minimize prop wobble other ineffi ciencies Bud Tenny PO Box S4S Richardson TX 75080 Humminbird/Caton Continued page 80 use straightedge find mark atop centerline tube lay straight piece wood almost thickness pylon along top centerline sight down toward tail aid checking alignment satisfied mark side straightedge cut through tube pylon will fit hole Note part tube above tank com partment should cut walls pylon will have fitted top tube area two spruce supports straddling tank compartment very important step setting proper incidence pylon Measure top rear pylon centerline side tube rear 152 Model Aviation TRANSMITTER CASE. trong thermo molded metal framed soft foam filled 901205 carryIng case best market SCans mitter Price 3250 Add 5250 shippIng Alaska Hawaii 450 ENGINE MOUNTS. fully machIned 6061T6 alsmlns brIghtly pellshof reteiSed mounting holes 60s 1205 Os 61000161 6581 OPt 60 VS 61 115 Os 60 50 90 Enya 60 los cyslos 122 Soya 90120 OS 120 foor sysles $25 Add 1150 ship Ca AK & III 5300 FIBERGLASS COWLS 70 cowls eelpants Sig Pica Top-Filte Jemco Nosen Pilot Stafford Radlais Behrens Garmhausen W E Tech other kits plans Onepiece laminated construction handlaid fIberglass strong hut lightweight Send BASE price list please Include names models interested parts br call between 9AM 9 PM EDT information COD ordering hope hear yout 5IBERGLASS ASTER 703 890-6017 Ospi MA 59 1 1st 530 Goodviec VA 24095 SASE FOR FREE cATALOGcA RESADD6 BERGERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 us can get completely true-running prop single bearing Shaft/spar misalign ment can spotted easily side TOLEDO THIRTY-SECOND ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 11 12 & 13 1986 presented Weak Signals R/C Club Toledo Ohio Exposition information available contacting Wayne Yeager co-director ticket address shown below ADVANCE TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon instead stamps Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $4 QOperday adults $100 per day children 12 under Ticket sales final non-refundable tickets along program will returned near mid-March COMPETITION CLASSES NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models HELICOPTER R/C CAR COMPETITION BOAT MILITARY SCALE BOAT PLEASURE POWER BOAT WORKING VESSEL-UNARMED distance should 31/16 measure top front pylon centerline front should 3 important thing relationship measurements front pylon should 1/16 %4 higher rear Get good pylon fit making sure main supports touch bottom tube Dont glue place yet Half-cowl Building straightforward hard select aluminum spinner backplate size want front cowl Make round piywood nose piece 2 ply sheet cutting just slightly larger spinner backplate cut large hole engine shaft pass through Tack-glue 1/n-in spacer spinner backplate Glue plywood nose piece spacer mount engine complete prop nose piece will become front end cowl already its final position proper spinner clearance Note firewall larger tube Wrap tube layer 1/16 balsa fill area fill extending about 2 back beveled rear construct cowl stringers first cut three strips spruce 6 long Run first strip nose piece down centerline left side tube CyA-glue spots holding place apply slow-curing epoxy around firewall stress points Repeat right side tube bottom produces outline cowl can filled medium balsa After stringers press soft balsa gaps hold CyA glue usually apply some thin slow-curing epoxy point make sure bond close remaining cracks strong filler Sand cowl its final shape coarse sandpaper block bringing front end down size spinner fairing rear stringers tube note will have able get angled Allen wrench between side cowl engine reaching mountingbolts Plan forthis bend spruce stringers around engine now has no lugs Place temporary spacer between side engine spruce maintain access space Wing beefy modified geodetic structure front sheeting take load hot climb top spar wings high point medium-hard /z6 sq balsa pre-cured carbon fiber CyA-glued top bottom make rigid resist impacts dethermalizing ribs cut 4-to 6-lb /32 sheet balsa feel wood little heavy can step down 1Ae sheet wing tip ribs 1/16 top sheeting leading edge over high point spar should weigh about 11 13 grams per 3 x 36-in sheet construction sequence use Notch trailing edge pin over plans Laminate leading edge pin down Pin bottom spar place Use piece Y16 sq wood make sure notches ribs deep enough set ribs over bottom spar ribs too long too short make adjust ments leading trailing edge CyA-glue ribs place add top spar end ribs wing panel can slanted match angle dihedral breaks cut some templates angle can establish correct di hedral build eliminate awful chore trying sand later Add webbing leave off center make room plywood brace will added later wing halves joined Fit glue rear diagonals leaving off front diagonals time being Mark cut 1/16 leading edge sheeting Tack-glue sheet front back rib remove wing plans can make sure sheeting straight along leading edge before gluing com pleted will help avoid washboard effect Continue attaching sheeting ribs CyA giue wing upside down front diagonals can cut trimmed conform contour sheeting wing tip construction same main panel except making An exact scale reproduction worlds successful Ultra Light aircraft Same material construction full scale aircraft Light enough electric power info pack send $1 stamped self ad dressed envelope Gene C Head aRt 10 Box 342 S Portsmouth KY 41174 April 1986 153 READY NOW Modelers Choice GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz $595 Kwik Set 6 Minute10 Os $995 Giant Kwik Set 6 Minute16 os$1395 Half FastlOMinutelOoz$995 GMP AIRCRAFT INSTRUMENTS 80 31161143181/2$ 149 40 3/4 inch $ 149 EASY OFF PULLER proper tool removing drive washeraand flywheels $ 795 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 513 385-7398 net year duder engr irect Fast B fluid add $150 020 Engines Free-Flight Rubber Pulse small Multi Channel R/C systems suitable 50 years ago mas very capable aircraft usell $2195 proportiosed stable model fligOt interestiog desigs boding itself balsa Structural techoigues KIT 002 Weve got eflole sour lavorites Please seed 505 Flyllee CetolegPhOne 17031 273-9093 Scalers 0113 OiStrnulerS ruimed FLYLINE MODELS INC PO Box 2136 Fairfax virginia 22031 curved leading trailing edges Stick about dozen pins behind leading edge plan line bend strip wood around pins Add next lamination tackglue place bend around curve leave strips extra length can bent around curve easily form trailing edge use straight edge cut about four slits outermost eight inches bend strips time around pins Again helps have extra wood length Both leading trailing edges should removed sanded flat before proceeding same con struction sequence used main panel fitting curved top sheeting easy turn tip upside down over sheet use fine-tip pen mark sheet along curve leading edge along curve aft side high point spar Cut out along outside marks fit place After panels built before joined together roughly trim leading edge knife leaving enough can form final shape coarse sandpaper block accuracy front airfoil freehand proposition easy become tired happens put work aside until later Im fresh enough give atten tion deserves trailing edge will need some coarse sanding bring down size overall sanding shaping wing can done large sanding block about 4 x 9 inso high spots along diagonals sheeting can brought line ribs airfoil references point Sandpaper 220-grit works well final smoothing can done 400-grit paper Join tips main panels 5min epoxy check again correct amount dihedral youve made mistake can heat epoxy covering iron until begins gas off will release outer joints have no brace just cover front joint back spar 34-oz glass cloth clear epoxy paint same top bottom trailing edge put two coats dope spot covered stick down glass thinner After dries use clear epoxy paint double cloth weight wing center section after inserting carbon fiber brace leading trail ing edges Once wing joined center cut out plywood wing support counter sink 6 bottom wing structure Next add main ply dihedral brace also serves foundation wing support Add 1/32 plywood braces around center rib spars making sure extend past end wing support run almost full height rib Use epoxy assembly because takes wing load dethermalized landings Stabilizer Construction identical wing word about weight might helpful try use 9- 11-gram sheet wood ribs top sheeting desirable have finished weight uncovered stab structure under 1 oz makes CG much easier control stab comes out heavier want cover lighter polyester film can reduce tail weight much 10 grams choosing lightest covering Setting up final assembly After cov ering wing stab temporarily mount everything rudder stab mount en gine prop pylon wing stab hold together rubberbands Place piece masking tape over center wing mark 68% chord hang model rubberbands Shift pylon slightly fine-tune proper CG remember slide stab pylon keep same moment relation ship set CG 2% 3% ahead 68% because paint final finishing usually move about amount Its time glue pylon epoxy stab mount vertical fin cover fin pylon half-cowl oz glass cloth because easier put good finish cloth cover up wood grain After sticking cloth dope thinner put two coats clear epoxy paint After dries mix dope talcum powder fairly thick grainy consistency paint two three coats dries hour less Sand off filler 220-grit paper repeat filler application/sanding until looks smooth ending up 320 400-grit paper fuselage sprayed epoxy color paint withstand high nitro fuels number VIT arrangements will work well shown photos dependable pull rubberbands tight stab endand have enough tension spring timer hold stab down under power stretching rubberbands hold stab trip line DT release No matter system someone new VIT chooses please understand require careful attention engineerin testing aspects possible something hang up pull loose can count happening Anything suspect needs changed anything changed needs tested 10 times today 10 times tomorrow want faster plane independent power glide trim VIT/AR way go Test flying Make sure engine run ning reliably test flood-off system VIT again before trying fly Check Y16-in washin right main panel Test glide slight left turn power settings enough negative stab incidence keep plane diving hand glide Use instant DT set 2-sec delay set 2- 3-sec engine run launch high right wing slightly low trim prop plan compete run engine peak rpm because trimming slow props rich engine means will have over again start going fast get ready let plane glide remember requires quite bit additional negative stab incidence Mine uses about er should trip right glide built first high-performance model article like Ive loved fast Free Flight ever since decide build Humminbird put some green somewhere help prove green airplanes fly 154 Model Aviation
Edition: Model Aviation - 1986/04
Page Numbers: 76, 77, 78, 79, 80, 152, 153, 154
NO OCR TEXT plane designed variableincidence stab auto-rudder re quires large amount negative stab incidence glide stab setting permitted CG placement responsible models good recovery characteristicsin conjunction rud der turn Stab tilt wont job plane version Humminbird VIT/AR should expected fly significant changes 35 engine set up flat backplate mount 00—no side thrust downthrust Under power angular dif ference betwen wing stab set about 1 0 slight amount left rudder necessary right main panel wing has /16 washin other panels being flat washin adds left rolling action helps keep planes nose up turns right under power Left This view shows ciean lines modei its smaii tubuiar fusciage made roiled balsa carbon fiber stiffeners running iengthwise between baisa laminations Right Though hand-held i about what youll see model l flight dis tinguished swept-back elliptical lines Green panels show up well against sky white wing tips easy see grass Len comorrum sisoimizer nouses ins arnnrmizr TUE nuur tub. mm IUIUUUU mium end dethermalizing stabilizer sliding up line Right Stab construction must beery win ihe thin airfoil curved trailing edge made slitting balsa bending around pins gluing isa stab lighter Class version Before covering weighed 19 grams Left Authois homemade timer plate uses reliable K-Mart camera timer front wire flood-off bottom line monofila ment rudder release top spring stab trip Note adjustable metal piate determines height stab trip Right Humminbirds half-cowl produces neat front end helps streamlining Note restraint line flood-off attached tothe engine Oversized intake maximizes power benefits pressurefuel supply Landing skid fits behind backplate mount April 1986 77 Rolled-tube fuselage under construction Carbon fiber strips being applied 1/16 sheet balsa Second lamination already has shaped sliding over first layer glide circle medium-large right Humminbird designed Cat III flying fast climb essen tial has kind power pattern will hold longer engine runsand kind glide will give other designs hard time other categories Fuselage rolled tube strong crush proof light will warp make tube 48 long two sheets A6 x 4 x 48-in A-grain balsa final weight tube will slightly weight two sheets started use sheets weighing 24 28 grams com pleted tube comes out 55 60 grams Following procedure making rolled tube fuselage Coat pool cue stick neutral color shoe polish wax clamp big end vise stick can used mandrel Spray side balsa sheets water wifes spray bottles handy Let soak few minutes spray again balsa pliable mold sheet around stick use light pressure wont crack Re strain wrapped balsa several 6-in strips masking tape tape will stick itself wet balsa wrap balsa elastic anlde ban dage remove masking tape wrap wood will dry about three hours will need two molded tubes will call B Remove bandage Lay metal straightedge along Tube balsa overlaps cut through both layers Remove excess wood slide tube slightly up mandrel pool cue get best fit seam position fasten Left Author fills homemade metal tank 11/4 oz high-nitro fuel Decorative trim cut out Super MonoKote main MonoKote covering must adhere well balsa surfaces using moderate pressure hot iron prevent warping Modified geo detic wing construction provides needed torsional rigidity Right Under construction can see half-cowl details Strip wood bent around firewall attached ply nose piece temporarily glued back engine spinner alignment 78 Model Aviation wing framework seen trom under side Extra front diagonal brace usually needed Itwas added instance because balsa lighter usual top spar laminated carbon fiber DETAIL edges together cyanoacrylate glue CyA Remove tube mandrel gently twisting back forth probab ly wont straight Feed tube back onto mandrel sand seam fill gaps soft Full-Size Plans Available. See Page 164 balsa cut seven strips pre-cured carbon fiber 3A2 wide 48 long CyA-glue strips evenly-spaced inter vals run length tube straight lines Sand strips 220-grit block Slide Tube B dry uncut over Tube Pull together tightly masking tape cut seam overlaps limiting cut Remove Tube B paintthe inside slow-curing epoxy thinned denatured alcohol consistency thick dope paint outside Tube two coats Slide Tube B back over Tube wrap elastic bandage seam will meet perfectly everywhere ignore let lamination cure least overnight Remove bandage next day fit soft balsa seam gaps Sand leaving seam full balsa dust apply CyA glue will notice some little longitudinal humps caused imbed ded carbon fiber strips Hold 180-grit sand paper hand twist tube other hand sand around circum ference careful let sandpaper edges gouge wood finish tube first coat two coats dope Mist-spray sheet %-oz fiberglass cloth dope will cut easily scissors Stick cloth tube thinner After dries thorough ly apply two coats clear epoxy paint fill grain cloth entire tube-building procedure can done two three hours working time will have find other things between different steps setting up round fuselage draw centerline down left side tube will need reference mounting firewall straight setting correct incidence pylon Engine mount installation power plant needs installed first Cut 116 dia round firewall -in plywood Cut backplate mount 1 diameter 342-in aluminum plate Remove engines backplate center over alu minum mount mark four backplate holes drill size Attach backplate newly-drilled mount engine checking fit Locate four points near edge mount can drill holes attach mount firewallfar enough April 1986 79 Close-up K&B 35 engine shows radial backplate mount shaved lugs Bottom tubing attached pressure tap ilnes up crankshaft opening little device sounds steady beep guide right plane Easily mounts smallest planes Use connector plug receiver same servo Also tells someone frequency solid state crystal oscillator Comes ready mount full structions included WT 1 oz DIM 1 x 2 3/8 x IN USA CLUB DISCOUNTS AVAILABLEI * ASK * SEND CHECK OR MONEY ORDER TO ELECTRONIC DESIGNS INC BOX Z 1925 GREENWOOD LK TPK HEWITT NEW JERSEY 07421 PHONE 201 728-1616 Pius $200 Shipping cant USA NJ Residents add 6% Sales Tax COD add $200 Allow 2 wks Shipping engine heads hex screws will clear side engine puts screw heads almost edge mount Remove mount en gine drill four marked holes 440 hex bolts align aluminum mount over firewall Drill through firewall using mount guide put 4-40 blind keeper nuts behind firewall Its good idea put some Vaseline nut threads some point will have drill shallow holes firewall make room heads engine backplate bolts Provisions fuel tank should made before going further built round metal tank hold 1 oz fuel has pressure line front top two lines going bottom rearone fuel feed other engine flood-off prefer pen bladder pacifier tank should build fuel-proof oompart meat tube point Seal wood epoxy glue cover well clear epoxy paint glue will stand up raw high-nitro fuel install firewall system first cut -in-thick hard balsa block fit snugly inside tube epoxy block rear firewall engine mounting plate attached firewall straightedge mounted place prop align engine centerline tube epoxy-glue firewall engine still attached will have cut off engine lugs plan use halfcowl backplate mount dont like backplate mount conventional aluminum beani mount will work fine will give front end crowded will also about 20 grams heavier convert beam mount note will need shift pylon forward about t tail surfaces forward same amount maintain same moments either mounting system bend skid Lon top sink firewall held place mount will twist Pylon Build over plans noting four main supports made spruce go way bottom tube aluminum wing plate bevel underside edges improves stream lining over traditional full-length wood mount held pylon two 4-40 flat-head screws countersunk alu minum anchored blind nuts small threaded aluminum bar inside pylon pylon skeleton sheeted -in medium balsa two small A2 ply dou blers added outside sheeting under neath aluminum wing plate support top pylon has small plywood insets front back accept holes blind wing keys pylon longer wing chord allow wing find its natural resting place tied down rubberbands should keyed position Continued page 152 80 Model Aviation p ONLY MODEL SUPPLY w%4 203 5750916 Flight-Proven Designs Tep 203 3931990 Balsa ConstructIon 56 lbs Cessna 150 40 Powered 62 sy ConstructIon 110-16 hrsJ Stable PIlars Mooney 40 Powered 62 le Uk Appearance Slow PlyIng CapabIlItIes Cherokee 40 Powered 60 ea plus $250 UPS /e Scale test Proven place Cherokee 200 plus 600 shIppIng Ken Barnes Cessna 15025 Powered 50 plus *250 UPS NEW Firemaster Bipa56 6A-7 lbs. 60 Powered 6996 llntroductory PrIcel NEW Pack Kat 25 powered sport flyer low wIng span 44 Intro PrIce $2600 MasterCard e VISA Coming Soon 60 Powered Pattern Ships Dealers Invited S aV0 Old limer0 psrtS 0jqU La syatteS Chel1WOlFrom this. - to riorS Point6 InltioZ Engine Parts Only Over 600 items Send $200 current catalog PRO TECHTOR PRO GMOUNT painted black finishing touches have put its time attach engines Make sure put offset washers under both engines per plans assure proper line tension have doubts about engines put stronger inboard side After mounting engines check sure model balances CG point shown plans Balancing front point nose-heaviness okay add nose weight balances aft tail-heaviness Flying Use 35-ft steel lines Start inboard engine first outboard doesnt hurt run outboard engine tad rich side both engines running top off fuel inboard engine helps ensure outboard engine will run out fuel first both engines running model will jump air after short takeoff run flies fairly fast reasonably maneuverable model has no problem flying engine although maneuvers should attempted stopped model designed use two 049 Cox Babe Bee engines though other va rieties Cox 049 engines could sub stituted fact pictures show different engines first day test flying Babe Bees developed fuel leak replaced Babe Bees two other Cox 049s Black Widow Dragon fly replacements provided some extra power longer running times though no doubt plane would fly almost well Babe Bees model has met expecta tions enjoy sound two engines synch ability model make fast laps ground holding downelevator before taking off Twins lot fun model easy way try twin minimum investment FF Indoor/Tenny Continued page 74 prop driven few turns short motor sure problem caused shaft/spar joint having brok en loose Correct other problems find tweaking wherever necessary Automatic-centering hooks can made ways favorite shown Figure 2 side view shows traditional round hook shaft centerline passing through center hook end view shows form back edge hook curve bend tends force rubber toward center hook rather riding up crooked knot hook easily formed using round nose pliers make round hook Dashed lines side view show grip hook conventional needle-nose duck-bill pliers form S curve Align tips round-nose pliers shaft centerline twist clock wise make 5 curve take two tries get just right curve since music wire tends spring back After getting 5 curve just right inspect hook closely sure alignment has changed Use prop-pitch gauge measure pitch both blades sure both blades same angle gauge adjustable check pitch angles two three places blade sure blade twist equal both blades photos shows adjustable prop-pitch gauge being used check setting torque-variable-pitch prop care make own gauge note following features 1 The prop shaft provided fixed reference point insure exact meas urements 2 Provision made measure blade angle one-inch intervals Both blades must checked same radius angles must match closely 3 The blade-angle protractor should have increments degree con structed solidly enough insure repeat able measurements Repairs made damaged prop blades must carefully made avoid changes stiffness structure particular application skin glue fracture prop spar can affect flaring char acteristics prop Cyanoacrylate glue can also stiffen structure unless used sparingly Finally damaged all-balsa blades must very carefully repaired restore exact blade shape Two other photos show two extremes illustrate concepts involved Boston ian prop very deep camber curv ature Any damage changes camber will obviously affect well prop runs will incautious application glue shrinks thereby pulling additional camber photo Stan Chiltons Easy Bs gives clear view full-length prop spars Stan uses very soft light wood sanded very thin prop blades full-length spar necessary control blades under power allow model ceilingscrub damaging prop blades Repair type prop very delicate must done block used build prop initially Next time prop wobble issue will carried construction techniques minimize prop wobble other ineffi ciencies Bud Tenny PO Box S4S Richardson TX 75080 Humminbird/Caton Continued page 80 use straightedge find mark atop centerline tube lay straight piece wood almost thickness pylon along top centerline sight down toward tail aid checking alignment satisfied mark side straightedge cut through tube pylon will fit hole Note part tube above tank com partment should cut walls pylon will have fitted top tube area two spruce supports straddling tank compartment very important step setting proper incidence pylon Measure top rear pylon centerline side tube rear 152 Model Aviation TRANSMITTER CASE. trong thermo molded metal framed soft foam filled 901205 carryIng case best market SCans mitter Price 3250 Add 5250 shippIng Alaska Hawaii 450 ENGINE MOUNTS. fully machIned 6061T6 alsmlns brIghtly pellshof reteiSed mounting holes 60s 1205 Os 61000161 6581 OPt 60 VS 61 115 Os 60 50 90 Enya 60 los cyslos 122 Soya 90120 OS 120 foor sysles $25 Add 1150 ship Ca AK & III 5300 FIBERGLASS COWLS 70 cowls eelpants Sig Pica Top-Filte Jemco Nosen Pilot Stafford Radlais Behrens Garmhausen W E Tech other kits plans Onepiece laminated construction handlaid fIberglass strong hut lightweight Send BASE price list please Include names models interested parts br call between 9AM 9 PM EDT information COD ordering hope hear yout 5IBERGLASS ASTER 703 890-6017 Ospi MA 59 1 1st 530 Goodviec VA 24095 SASE FOR FREE cATALOGcA RESADD6 BERGERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 us can get completely true-running prop single bearing Shaft/spar misalign ment can spotted easily side TOLEDO THIRTY-SECOND ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 11 12 & 13 1986 presented Weak Signals R/C Club Toledo Ohio Exposition information available contacting Wayne Yeager co-director ticket address shown below ADVANCE TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon instead stamps Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $4 QOperday adults $100 per day children 12 under Ticket sales final non-refundable tickets along program will returned near mid-March COMPETITION CLASSES NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models HELICOPTER R/C CAR COMPETITION BOAT MILITARY SCALE BOAT PLEASURE POWER BOAT WORKING VESSEL-UNARMED distance should 31/16 measure top front pylon centerline front should 3 important thing relationship measurements front pylon should 1/16 %4 higher rear Get good pylon fit making sure main supports touch bottom tube Dont glue place yet Half-cowl Building straightforward hard select aluminum spinner backplate size want front cowl Make round piywood nose piece 2 ply sheet cutting just slightly larger spinner backplate cut large hole engine shaft pass through Tack-glue 1/n-in spacer spinner backplate Glue plywood nose piece spacer mount engine complete prop nose piece will become front end cowl already its final position proper spinner clearance Note firewall larger tube Wrap tube layer 1/16 balsa fill area fill extending about 2 back beveled rear construct cowl stringers first cut three strips spruce 6 long Run first strip nose piece down centerline left side tube CyA-glue spots holding place apply slow-curing epoxy around firewall stress points Repeat right side tube bottom produces outline cowl can filled medium balsa After stringers press soft balsa gaps hold CyA glue usually apply some thin slow-curing epoxy point make sure bond close remaining cracks strong filler Sand cowl its final shape coarse sandpaper block bringing front end down size spinner fairing rear stringers tube note will have able get angled Allen wrench between side cowl engine reaching mountingbolts Plan forthis bend spruce stringers around engine now has no lugs Place temporary spacer between side engine spruce maintain access space Wing beefy modified geodetic structure front sheeting take load hot climb top spar wings high point medium-hard /z6 sq balsa pre-cured carbon fiber CyA-glued top bottom make rigid resist impacts dethermalizing ribs cut 4-to 6-lb /32 sheet balsa feel wood little heavy can step down 1Ae sheet wing tip ribs 1/16 top sheeting leading edge over high point spar should weigh about 11 13 grams per 3 x 36-in sheet construction sequence use Notch trailing edge pin over plans Laminate leading edge pin down Pin bottom spar place Use piece Y16 sq wood make sure notches ribs deep enough set ribs over bottom spar ribs too long too short make adjust ments leading trailing edge CyA-glue ribs place add top spar end ribs wing panel can slanted match angle dihedral breaks cut some templates angle can establish correct di hedral build eliminate awful chore trying sand later Add webbing leave off center make room plywood brace will added later wing halves joined Fit glue rear diagonals leaving off front diagonals time being Mark cut 1/16 leading edge sheeting Tack-glue sheet front back rib remove wing plans can make sure sheeting straight along leading edge before gluing com pleted will help avoid washboard effect Continue attaching sheeting ribs CyA giue wing upside down front diagonals can cut trimmed conform contour sheeting wing tip construction same main panel except making An exact scale reproduction worlds successful Ultra Light aircraft Same material construction full scale aircraft Light enough electric power info pack send $1 stamped self ad dressed envelope Gene C Head aRt 10 Box 342 S Portsmouth KY 41174 April 1986 153 READY NOW Modelers Choice GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz $595 Kwik Set 6 Minute10 Os $995 Giant Kwik Set 6 Minute16 os$1395 Half FastlOMinutelOoz$995 GMP AIRCRAFT INSTRUMENTS 80 31161143181/2$ 149 40 3/4 inch $ 149 EASY OFF PULLER proper tool removing drive washeraand flywheels $ 795 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 513 385-7398 net year duder engr irect Fast B fluid add $150 020 Engines Free-Flight Rubber Pulse small Multi Channel R/C systems suitable 50 years ago mas very capable aircraft usell $2195 proportiosed stable model fligOt interestiog desigs boding itself balsa Structural techoigues KIT 002 Weve got eflole sour lavorites Please seed 505 Flyllee CetolegPhOne 17031 273-9093 Scalers 0113 OiStrnulerS ruimed FLYLINE MODELS INC PO Box 2136 Fairfax virginia 22031 curved leading trailing edges Stick about dozen pins behind leading edge plan line bend strip wood around pins Add next lamination tackglue place bend around curve leave strips extra length can bent around curve easily form trailing edge use straight edge cut about four slits outermost eight inches bend strips time around pins Again helps have extra wood length Both leading trailing edges should removed sanded flat before proceeding same con struction sequence used main panel fitting curved top sheeting easy turn tip upside down over sheet use fine-tip pen mark sheet along curve leading edge along curve aft side high point spar Cut out along outside marks fit place After panels built before joined together roughly trim leading edge knife leaving enough can form final shape coarse sandpaper block accuracy front airfoil freehand proposition easy become tired happens put work aside until later Im fresh enough give atten tion deserves trailing edge will need some coarse sanding bring down size overall sanding shaping wing can done large sanding block about 4 x 9 inso high spots along diagonals sheeting can brought line ribs airfoil references point Sandpaper 220-grit works well final smoothing can done 400-grit paper Join tips main panels 5min epoxy check again correct amount dihedral youve made mistake can heat epoxy covering iron until begins gas off will release outer joints have no brace just cover front joint back spar 34-oz glass cloth clear epoxy paint same top bottom trailing edge put two coats dope spot covered stick down glass thinner After dries use clear epoxy paint double cloth weight wing center section after inserting carbon fiber brace leading trail ing edges Once wing joined center cut out plywood wing support counter sink 6 bottom wing structure Next add main ply dihedral brace also serves foundation wing support Add 1/32 plywood braces around center rib spars making sure extend past end wing support run almost full height rib Use epoxy assembly because takes wing load dethermalized landings Stabilizer Construction identical wing word about weight might helpful try use 9- 11-gram sheet wood ribs top sheeting desirable have finished weight uncovered stab structure under 1 oz makes CG much easier control stab comes out heavier want cover lighter polyester film can reduce tail weight much 10 grams choosing lightest covering Setting up final assembly After cov ering wing stab temporarily mount everything rudder stab mount en gine prop pylon wing stab hold together rubberbands Place piece masking tape over center wing mark 68% chord hang model rubberbands Shift pylon slightly fine-tune proper CG remember slide stab pylon keep same moment relation ship set CG 2% 3% ahead 68% because paint final finishing usually move about amount Its time glue pylon epoxy stab mount vertical fin cover fin pylon half-cowl oz glass cloth because easier put good finish cloth cover up wood grain After sticking cloth dope thinner put two coats clear epoxy paint After dries mix dope talcum powder fairly thick grainy consistency paint two three coats dries hour less Sand off filler 220-grit paper repeat filler application/sanding until looks smooth ending up 320 400-grit paper fuselage sprayed epoxy color paint withstand high nitro fuels number VIT arrangements will work well shown photos dependable pull rubberbands tight stab endand have enough tension spring timer hold stab down under power stretching rubberbands hold stab trip line DT release No matter system someone new VIT chooses please understand require careful attention engineerin testing aspects possible something hang up pull loose can count happening Anything suspect needs changed anything changed needs tested 10 times today 10 times tomorrow want faster plane independent power glide trim VIT/AR way go Test flying Make sure engine run ning reliably test flood-off system VIT again before trying fly Check Y16-in washin right main panel Test glide slight left turn power settings enough negative stab incidence keep plane diving hand glide Use instant DT set 2-sec delay set 2- 3-sec engine run launch high right wing slightly low trim prop plan compete run engine peak rpm because trimming slow props rich engine means will have over again start going fast get ready let plane glide remember requires quite bit additional negative stab incidence Mine uses about er should trip right glide built first high-performance model article like Ive loved fast Free Flight ever since decide build Humminbird put some green somewhere help prove green airplanes fly 154 Model Aviation
Edition: Model Aviation - 1986/04
Page Numbers: 76, 77, 78, 79, 80, 152, 153, 154
NO OCR TEXT plane designed variableincidence stab auto-rudder re quires large amount negative stab incidence glide stab setting permitted CG placement responsible models good recovery characteristicsin conjunction rud der turn Stab tilt wont job plane version Humminbird VIT/AR should expected fly significant changes 35 engine set up flat backplate mount 00—no side thrust downthrust Under power angular dif ference betwen wing stab set about 1 0 slight amount left rudder necessary right main panel wing has /16 washin other panels being flat washin adds left rolling action helps keep planes nose up turns right under power Left This view shows ciean lines modei its smaii tubuiar fusciage made roiled balsa carbon fiber stiffeners running iengthwise between baisa laminations Right Though hand-held i about what youll see model l flight dis tinguished swept-back elliptical lines Green panels show up well against sky white wing tips easy see grass Len comorrum sisoimizer nouses ins arnnrmizr TUE nuur tub. mm IUIUUUU mium end dethermalizing stabilizer sliding up line Right Stab construction must beery win ihe thin airfoil curved trailing edge made slitting balsa bending around pins gluing isa stab lighter Class version Before covering weighed 19 grams Left Authois homemade timer plate uses reliable K-Mart camera timer front wire flood-off bottom line monofila ment rudder release top spring stab trip Note adjustable metal piate determines height stab trip Right Humminbirds half-cowl produces neat front end helps streamlining Note restraint line flood-off attached tothe engine Oversized intake maximizes power benefits pressurefuel supply Landing skid fits behind backplate mount April 1986 77 Rolled-tube fuselage under construction Carbon fiber strips being applied 1/16 sheet balsa Second lamination already has shaped sliding over first layer glide circle medium-large right Humminbird designed Cat III flying fast climb essen tial has kind power pattern will hold longer engine runsand kind glide will give other designs hard time other categories Fuselage rolled tube strong crush proof light will warp make tube 48 long two sheets A6 x 4 x 48-in A-grain balsa final weight tube will slightly weight two sheets started use sheets weighing 24 28 grams com pleted tube comes out 55 60 grams Following procedure making rolled tube fuselage Coat pool cue stick neutral color shoe polish wax clamp big end vise stick can used mandrel Spray side balsa sheets water wifes spray bottles handy Let soak few minutes spray again balsa pliable mold sheet around stick use light pressure wont crack Re strain wrapped balsa several 6-in strips masking tape tape will stick itself wet balsa wrap balsa elastic anlde ban dage remove masking tape wrap wood will dry about three hours will need two molded tubes will call B Remove bandage Lay metal straightedge along Tube balsa overlaps cut through both layers Remove excess wood slide tube slightly up mandrel pool cue get best fit seam position fasten Left Author fills homemade metal tank 11/4 oz high-nitro fuel Decorative trim cut out Super MonoKote main MonoKote covering must adhere well balsa surfaces using moderate pressure hot iron prevent warping Modified geo detic wing construction provides needed torsional rigidity Right Under construction can see half-cowl details Strip wood bent around firewall attached ply nose piece temporarily glued back engine spinner alignment 78 Model Aviation wing framework seen trom under side Extra front diagonal brace usually needed Itwas added instance because balsa lighter usual top spar laminated carbon fiber DETAIL edges together cyanoacrylate glue CyA Remove tube mandrel gently twisting back forth probab ly wont straight Feed tube back onto mandrel sand seam fill gaps soft Full-Size Plans Available. See Page 164 balsa cut seven strips pre-cured carbon fiber 3A2 wide 48 long CyA-glue strips evenly-spaced inter vals run length tube straight lines Sand strips 220-grit block Slide Tube B dry uncut over Tube Pull together tightly masking tape cut seam overlaps limiting cut Remove Tube B paintthe inside slow-curing epoxy thinned denatured alcohol consistency thick dope paint outside Tube two coats Slide Tube B back over Tube wrap elastic bandage seam will meet perfectly everywhere ignore let lamination cure least overnight Remove bandage next day fit soft balsa seam gaps Sand leaving seam full balsa dust apply CyA glue will notice some little longitudinal humps caused imbed ded carbon fiber strips Hold 180-grit sand paper hand twist tube other hand sand around circum ference careful let sandpaper edges gouge wood finish tube first coat two coats dope Mist-spray sheet %-oz fiberglass cloth dope will cut easily scissors Stick cloth tube thinner After dries thorough ly apply two coats clear epoxy paint fill grain cloth entire tube-building procedure can done two three hours working time will have find other things between different steps setting up round fuselage draw centerline down left side tube will need reference mounting firewall straight setting correct incidence pylon Engine mount installation power plant needs installed first Cut 116 dia round firewall -in plywood Cut backplate mount 1 diameter 342-in aluminum plate Remove engines backplate center over alu minum mount mark four backplate holes drill size Attach backplate newly-drilled mount engine checking fit Locate four points near edge mount can drill holes attach mount firewallfar enough April 1986 79 Close-up K&B 35 engine shows radial backplate mount shaved lugs Bottom tubing attached pressure tap ilnes up crankshaft opening little device sounds steady beep guide right plane Easily mounts smallest planes Use connector plug receiver same servo Also tells someone frequency solid state crystal oscillator Comes ready mount full structions included WT 1 oz DIM 1 x 2 3/8 x IN USA CLUB DISCOUNTS AVAILABLEI * ASK * SEND CHECK OR MONEY ORDER TO ELECTRONIC DESIGNS INC BOX Z 1925 GREENWOOD LK TPK HEWITT NEW JERSEY 07421 PHONE 201 728-1616 Pius $200 Shipping cant USA NJ Residents add 6% Sales Tax COD add $200 Allow 2 wks Shipping engine heads hex screws will clear side engine puts screw heads almost edge mount Remove mount en gine drill four marked holes 440 hex bolts align aluminum mount over firewall Drill through firewall using mount guide put 4-40 blind keeper nuts behind firewall Its good idea put some Vaseline nut threads some point will have drill shallow holes firewall make room heads engine backplate bolts Provisions fuel tank should made before going further built round metal tank hold 1 oz fuel has pressure line front top two lines going bottom rearone fuel feed other engine flood-off prefer pen bladder pacifier tank should build fuel-proof oompart meat tube point Seal wood epoxy glue cover well clear epoxy paint glue will stand up raw high-nitro fuel install firewall system first cut -in-thick hard balsa block fit snugly inside tube epoxy block rear firewall engine mounting plate attached firewall straightedge mounted place prop align engine centerline tube epoxy-glue firewall engine still attached will have cut off engine lugs plan use halfcowl backplate mount dont like backplate mount conventional aluminum beani mount will work fine will give front end crowded will also about 20 grams heavier convert beam mount note will need shift pylon forward about t tail surfaces forward same amount maintain same moments either mounting system bend skid Lon top sink firewall held place mount will twist Pylon Build over plans noting four main supports made spruce go way bottom tube aluminum wing plate bevel underside edges improves stream lining over traditional full-length wood mount held pylon two 4-40 flat-head screws countersunk alu minum anchored blind nuts small threaded aluminum bar inside pylon pylon skeleton sheeted -in medium balsa two small A2 ply dou blers added outside sheeting under neath aluminum wing plate support top pylon has small plywood insets front back accept holes blind wing keys pylon longer wing chord allow wing find its natural resting place tied down rubberbands should keyed position Continued page 152 80 Model Aviation p ONLY MODEL SUPPLY w%4 203 5750916 Flight-Proven Designs Tep 203 3931990 Balsa ConstructIon 56 lbs Cessna 150 40 Powered 62 sy ConstructIon 110-16 hrsJ Stable PIlars Mooney 40 Powered 62 le Uk Appearance Slow PlyIng CapabIlItIes Cherokee 40 Powered 60 ea plus $250 UPS /e Scale test Proven place Cherokee 200 plus 600 shIppIng Ken Barnes Cessna 15025 Powered 50 plus *250 UPS NEW Firemaster Bipa56 6A-7 lbs. 60 Powered 6996 llntroductory PrIcel NEW Pack Kat 25 powered sport flyer low wIng span 44 Intro PrIce $2600 MasterCard e VISA Coming Soon 60 Powered Pattern Ships Dealers Invited S aV0 Old limer0 psrtS 0jqU La syatteS Chel1WOlFrom this. - to riorS Point6 InltioZ Engine Parts Only Over 600 items Send $200 current catalog PRO TECHTOR PRO GMOUNT painted black finishing touches have put its time attach engines Make sure put offset washers under both engines per plans assure proper line tension have doubts about engines put stronger inboard side After mounting engines check sure model balances CG point shown plans Balancing front point nose-heaviness okay add nose weight balances aft tail-heaviness Flying Use 35-ft steel lines Start inboard engine first outboard doesnt hurt run outboard engine tad rich side both engines running top off fuel inboard engine helps ensure outboard engine will run out fuel first both engines running model will jump air after short takeoff run flies fairly fast reasonably maneuverable model has no problem flying engine although maneuvers should attempted stopped model designed use two 049 Cox Babe Bee engines though other va rieties Cox 049 engines could sub stituted fact pictures show different engines first day test flying Babe Bees developed fuel leak replaced Babe Bees two other Cox 049s Black Widow Dragon fly replacements provided some extra power longer running times though no doubt plane would fly almost well Babe Bees model has met expecta tions enjoy sound two engines synch ability model make fast laps ground holding downelevator before taking off Twins lot fun model easy way try twin minimum investment FF Indoor/Tenny Continued page 74 prop driven few turns short motor sure problem caused shaft/spar joint having brok en loose Correct other problems find tweaking wherever necessary Automatic-centering hooks can made ways favorite shown Figure 2 side view shows traditional round hook shaft centerline passing through center hook end view shows form back edge hook curve bend tends force rubber toward center hook rather riding up crooked knot hook easily formed using round nose pliers make round hook Dashed lines side view show grip hook conventional needle-nose duck-bill pliers form S curve Align tips round-nose pliers shaft centerline twist clock wise make 5 curve take two tries get just right curve since music wire tends spring back After getting 5 curve just right inspect hook closely sure alignment has changed Use prop-pitch gauge measure pitch both blades sure both blades same angle gauge adjustable check pitch angles two three places blade sure blade twist equal both blades photos shows adjustable prop-pitch gauge being used check setting torque-variable-pitch prop care make own gauge note following features 1 The prop shaft provided fixed reference point insure exact meas urements 2 Provision made measure blade angle one-inch intervals Both blades must checked same radius angles must match closely 3 The blade-angle protractor should have increments degree con structed solidly enough insure repeat able measurements Repairs made damaged prop blades must carefully made avoid changes stiffness structure particular application skin glue fracture prop spar can affect flaring char acteristics prop Cyanoacrylate glue can also stiffen structure unless used sparingly Finally damaged all-balsa blades must very carefully repaired restore exact blade shape Two other photos show two extremes illustrate concepts involved Boston ian prop very deep camber curv ature Any damage changes camber will obviously affect well prop runs will incautious application glue shrinks thereby pulling additional camber photo Stan Chiltons Easy Bs gives clear view full-length prop spars Stan uses very soft light wood sanded very thin prop blades full-length spar necessary control blades under power allow model ceilingscrub damaging prop blades Repair type prop very delicate must done block used build prop initially Next time prop wobble issue will carried construction techniques minimize prop wobble other ineffi ciencies Bud Tenny PO Box S4S Richardson TX 75080 Humminbird/Caton Continued page 80 use straightedge find mark atop centerline tube lay straight piece wood almost thickness pylon along top centerline sight down toward tail aid checking alignment satisfied mark side straightedge cut through tube pylon will fit hole Note part tube above tank com partment should cut walls pylon will have fitted top tube area two spruce supports straddling tank compartment very important step setting proper incidence pylon Measure top rear pylon centerline side tube rear 152 Model Aviation TRANSMITTER CASE. trong thermo molded metal framed soft foam filled 901205 carryIng case best market SCans mitter Price 3250 Add 5250 shippIng Alaska Hawaii 450 ENGINE MOUNTS. fully machIned 6061T6 alsmlns brIghtly pellshof reteiSed mounting holes 60s 1205 Os 61000161 6581 OPt 60 VS 61 115 Os 60 50 90 Enya 60 los cyslos 122 Soya 90120 OS 120 foor sysles $25 Add 1150 ship Ca AK & III 5300 FIBERGLASS COWLS 70 cowls eelpants Sig Pica Top-Filte Jemco Nosen Pilot Stafford Radlais Behrens Garmhausen W E Tech other kits plans Onepiece laminated construction handlaid fIberglass strong hut lightweight Send BASE price list please Include names models interested parts br call between 9AM 9 PM EDT information COD ordering hope hear yout 5IBERGLASS ASTER 703 890-6017 Ospi MA 59 1 1st 530 Goodviec VA 24095 SASE FOR FREE cATALOGcA RESADD6 BERGERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 us can get completely true-running prop single bearing Shaft/spar misalign ment can spotted easily side TOLEDO THIRTY-SECOND ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 11 12 & 13 1986 presented Weak Signals R/C Club Toledo Ohio Exposition information available contacting Wayne Yeager co-director ticket address shown below ADVANCE TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon instead stamps Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $4 QOperday adults $100 per day children 12 under Ticket sales final non-refundable tickets along program will returned near mid-March COMPETITION CLASSES NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models HELICOPTER R/C CAR COMPETITION BOAT MILITARY SCALE BOAT PLEASURE POWER BOAT WORKING VESSEL-UNARMED distance should 31/16 measure top front pylon centerline front should 3 important thing relationship measurements front pylon should 1/16 %4 higher rear Get good pylon fit making sure main supports touch bottom tube Dont glue place yet Half-cowl Building straightforward hard select aluminum spinner backplate size want front cowl Make round piywood nose piece 2 ply sheet cutting just slightly larger spinner backplate cut large hole engine shaft pass through Tack-glue 1/n-in spacer spinner backplate Glue plywood nose piece spacer mount engine complete prop nose piece will become front end cowl already its final position proper spinner clearance Note firewall larger tube Wrap tube layer 1/16 balsa fill area fill extending about 2 back beveled rear construct cowl stringers first cut three strips spruce 6 long Run first strip nose piece down centerline left side tube CyA-glue spots holding place apply slow-curing epoxy around firewall stress points Repeat right side tube bottom produces outline cowl can filled medium balsa After stringers press soft balsa gaps hold CyA glue usually apply some thin slow-curing epoxy point make sure bond close remaining cracks strong filler Sand cowl its final shape coarse sandpaper block bringing front end down size spinner fairing rear stringers tube note will have able get angled Allen wrench between side cowl engine reaching mountingbolts Plan forthis bend spruce stringers around engine now has no lugs Place temporary spacer between side engine spruce maintain access space Wing beefy modified geodetic structure front sheeting take load hot climb top spar wings high point medium-hard /z6 sq balsa pre-cured carbon fiber CyA-glued top bottom make rigid resist impacts dethermalizing ribs cut 4-to 6-lb /32 sheet balsa feel wood little heavy can step down 1Ae sheet wing tip ribs 1/16 top sheeting leading edge over high point spar should weigh about 11 13 grams per 3 x 36-in sheet construction sequence use Notch trailing edge pin over plans Laminate leading edge pin down Pin bottom spar place Use piece Y16 sq wood make sure notches ribs deep enough set ribs over bottom spar ribs too long too short make adjust ments leading trailing edge CyA-glue ribs place add top spar end ribs wing panel can slanted match angle dihedral breaks cut some templates angle can establish correct di hedral build eliminate awful chore trying sand later Add webbing leave off center make room plywood brace will added later wing halves joined Fit glue rear diagonals leaving off front diagonals time being Mark cut 1/16 leading edge sheeting Tack-glue sheet front back rib remove wing plans can make sure sheeting straight along leading edge before gluing com pleted will help avoid washboard effect Continue attaching sheeting ribs CyA giue wing upside down front diagonals can cut trimmed conform contour sheeting wing tip construction same main panel except making An exact scale reproduction worlds successful Ultra Light aircraft Same material construction full scale aircraft Light enough electric power info pack send $1 stamped self ad dressed envelope Gene C Head aRt 10 Box 342 S Portsmouth KY 41174 April 1986 153 READY NOW Modelers Choice GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz $595 Kwik Set 6 Minute10 Os $995 Giant Kwik Set 6 Minute16 os$1395 Half FastlOMinutelOoz$995 GMP AIRCRAFT INSTRUMENTS 80 31161143181/2$ 149 40 3/4 inch $ 149 EASY OFF PULLER proper tool removing drive washeraand flywheels $ 795 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 513 385-7398 net year duder engr irect Fast B fluid add $150 020 Engines Free-Flight Rubber Pulse small Multi Channel R/C systems suitable 50 years ago mas very capable aircraft usell $2195 proportiosed stable model fligOt interestiog desigs boding itself balsa Structural techoigues KIT 002 Weve got eflole sour lavorites Please seed 505 Flyllee CetolegPhOne 17031 273-9093 Scalers 0113 OiStrnulerS ruimed FLYLINE MODELS INC PO Box 2136 Fairfax virginia 22031 curved leading trailing edges Stick about dozen pins behind leading edge plan line bend strip wood around pins Add next lamination tackglue place bend around curve leave strips extra length can bent around curve easily form trailing edge use straight edge cut about four slits outermost eight inches bend strips time around pins Again helps have extra wood length Both leading trailing edges should removed sanded flat before proceeding same con struction sequence used main panel fitting curved top sheeting easy turn tip upside down over sheet use fine-tip pen mark sheet along curve leading edge along curve aft side high point spar Cut out along outside marks fit place After panels built before joined together roughly trim leading edge knife leaving enough can form final shape coarse sandpaper block accuracy front airfoil freehand proposition easy become tired happens put work aside until later Im fresh enough give atten tion deserves trailing edge will need some coarse sanding bring down size overall sanding shaping wing can done large sanding block about 4 x 9 inso high spots along diagonals sheeting can brought line ribs airfoil references point Sandpaper 220-grit works well final smoothing can done 400-grit paper Join tips main panels 5min epoxy check again correct amount dihedral youve made mistake can heat epoxy covering iron until begins gas off will release outer joints have no brace just cover front joint back spar 34-oz glass cloth clear epoxy paint same top bottom trailing edge put two coats dope spot covered stick down glass thinner After dries use clear epoxy paint double cloth weight wing center section after inserting carbon fiber brace leading trail ing edges Once wing joined center cut out plywood wing support counter sink 6 bottom wing structure Next add main ply dihedral brace also serves foundation wing support Add 1/32 plywood braces around center rib spars making sure extend past end wing support run almost full height rib Use epoxy assembly because takes wing load dethermalized landings Stabilizer Construction identical wing word about weight might helpful try use 9- 11-gram sheet wood ribs top sheeting desirable have finished weight uncovered stab structure under 1 oz makes CG much easier control stab comes out heavier want cover lighter polyester film can reduce tail weight much 10 grams choosing lightest covering Setting up final assembly After cov ering wing stab temporarily mount everything rudder stab mount en gine prop pylon wing stab hold together rubberbands Place piece masking tape over center wing mark 68% chord hang model rubberbands Shift pylon slightly fine-tune proper CG remember slide stab pylon keep same moment relation ship set CG 2% 3% ahead 68% because paint final finishing usually move about amount Its time glue pylon epoxy stab mount vertical fin cover fin pylon half-cowl oz glass cloth because easier put good finish cloth cover up wood grain After sticking cloth dope thinner put two coats clear epoxy paint After dries mix dope talcum powder fairly thick grainy consistency paint two three coats dries hour less Sand off filler 220-grit paper repeat filler application/sanding until looks smooth ending up 320 400-grit paper fuselage sprayed epoxy color paint withstand high nitro fuels number VIT arrangements will work well shown photos dependable pull rubberbands tight stab endand have enough tension spring timer hold stab down under power stretching rubberbands hold stab trip line DT release No matter system someone new VIT chooses please understand require careful attention engineerin testing aspects possible something hang up pull loose can count happening Anything suspect needs changed anything changed needs tested 10 times today 10 times tomorrow want faster plane independent power glide trim VIT/AR way go Test flying Make sure engine run ning reliably test flood-off system VIT again before trying fly Check Y16-in washin right main panel Test glide slight left turn power settings enough negative stab incidence keep plane diving hand glide Use instant DT set 2-sec delay set 2- 3-sec engine run launch high right wing slightly low trim prop plan compete run engine peak rpm because trimming slow props rich engine means will have over again start going fast get ready let plane glide remember requires quite bit additional negative stab incidence Mine uses about er should trip right glide built first high-performance model article like Ive loved fast Free Flight ever since decide build Humminbird put some green somewhere help prove green airplanes fly 154 Model Aviation
Edition: Model Aviation - 1986/04
Page Numbers: 76, 77, 78, 79, 80, 152, 153, 154
NO OCR TEXT plane designed variableincidence stab auto-rudder re quires large amount negative stab incidence glide stab setting permitted CG placement responsible models good recovery characteristicsin conjunction rud der turn Stab tilt wont job plane version Humminbird VIT/AR should expected fly significant changes 35 engine set up flat backplate mount 00—no side thrust downthrust Under power angular dif ference betwen wing stab set about 1 0 slight amount left rudder necessary right main panel wing has /16 washin other panels being flat washin adds left rolling action helps keep planes nose up turns right under power Left This view shows ciean lines modei its smaii tubuiar fusciage made roiled balsa carbon fiber stiffeners running iengthwise between baisa laminations Right Though hand-held i about what youll see model l flight dis tinguished swept-back elliptical lines Green panels show up well against sky white wing tips easy see grass Len comorrum sisoimizer nouses ins arnnrmizr TUE nuur tub. mm IUIUUUU mium end dethermalizing stabilizer sliding up line Right Stab construction must beery win ihe thin airfoil curved trailing edge made slitting balsa bending around pins gluing isa stab lighter Class version Before covering weighed 19 grams Left Authois homemade timer plate uses reliable K-Mart camera timer front wire flood-off bottom line monofila ment rudder release top spring stab trip Note adjustable metal piate determines height stab trip Right Humminbirds half-cowl produces neat front end helps streamlining Note restraint line flood-off attached tothe engine Oversized intake maximizes power benefits pressurefuel supply Landing skid fits behind backplate mount April 1986 77 Rolled-tube fuselage under construction Carbon fiber strips being applied 1/16 sheet balsa Second lamination already has shaped sliding over first layer glide circle medium-large right Humminbird designed Cat III flying fast climb essen tial has kind power pattern will hold longer engine runsand kind glide will give other designs hard time other categories Fuselage rolled tube strong crush proof light will warp make tube 48 long two sheets A6 x 4 x 48-in A-grain balsa final weight tube will slightly weight two sheets started use sheets weighing 24 28 grams com pleted tube comes out 55 60 grams Following procedure making rolled tube fuselage Coat pool cue stick neutral color shoe polish wax clamp big end vise stick can used mandrel Spray side balsa sheets water wifes spray bottles handy Let soak few minutes spray again balsa pliable mold sheet around stick use light pressure wont crack Re strain wrapped balsa several 6-in strips masking tape tape will stick itself wet balsa wrap balsa elastic anlde ban dage remove masking tape wrap wood will dry about three hours will need two molded tubes will call B Remove bandage Lay metal straightedge along Tube balsa overlaps cut through both layers Remove excess wood slide tube slightly up mandrel pool cue get best fit seam position fasten Left Author fills homemade metal tank 11/4 oz high-nitro fuel Decorative trim cut out Super MonoKote main MonoKote covering must adhere well balsa surfaces using moderate pressure hot iron prevent warping Modified geo detic wing construction provides needed torsional rigidity Right Under construction can see half-cowl details Strip wood bent around firewall attached ply nose piece temporarily glued back engine spinner alignment 78 Model Aviation wing framework seen trom under side Extra front diagonal brace usually needed Itwas added instance because balsa lighter usual top spar laminated carbon fiber DETAIL edges together cyanoacrylate glue CyA Remove tube mandrel gently twisting back forth probab ly wont straight Feed tube back onto mandrel sand seam fill gaps soft Full-Size Plans Available. See Page 164 balsa cut seven strips pre-cured carbon fiber 3A2 wide 48 long CyA-glue strips evenly-spaced inter vals run length tube straight lines Sand strips 220-grit block Slide Tube B dry uncut over Tube Pull together tightly masking tape cut seam overlaps limiting cut Remove Tube B paintthe inside slow-curing epoxy thinned denatured alcohol consistency thick dope paint outside Tube two coats Slide Tube B back over Tube wrap elastic bandage seam will meet perfectly everywhere ignore let lamination cure least overnight Remove bandage next day fit soft balsa seam gaps Sand leaving seam full balsa dust apply CyA glue will notice some little longitudinal humps caused imbed ded carbon fiber strips Hold 180-grit sand paper hand twist tube other hand sand around circum ference careful let sandpaper edges gouge wood finish tube first coat two coats dope Mist-spray sheet %-oz fiberglass cloth dope will cut easily scissors Stick cloth tube thinner After dries thorough ly apply two coats clear epoxy paint fill grain cloth entire tube-building procedure can done two three hours working time will have find other things between different steps setting up round fuselage draw centerline down left side tube will need reference mounting firewall straight setting correct incidence pylon Engine mount installation power plant needs installed first Cut 116 dia round firewall -in plywood Cut backplate mount 1 diameter 342-in aluminum plate Remove engines backplate center over alu minum mount mark four backplate holes drill size Attach backplate newly-drilled mount engine checking fit Locate four points near edge mount can drill holes attach mount firewallfar enough April 1986 79 Close-up K&B 35 engine shows radial backplate mount shaved lugs Bottom tubing attached pressure tap ilnes up crankshaft opening little device sounds steady beep guide right plane Easily mounts smallest planes Use connector plug receiver same servo Also tells someone frequency solid state crystal oscillator Comes ready mount full structions included WT 1 oz DIM 1 x 2 3/8 x IN USA CLUB DISCOUNTS AVAILABLEI * ASK * SEND CHECK OR MONEY ORDER TO ELECTRONIC DESIGNS INC BOX Z 1925 GREENWOOD LK TPK HEWITT NEW JERSEY 07421 PHONE 201 728-1616 Pius $200 Shipping cant USA NJ Residents add 6% Sales Tax COD add $200 Allow 2 wks Shipping engine heads hex screws will clear side engine puts screw heads almost edge mount Remove mount en gine drill four marked holes 440 hex bolts align aluminum mount over firewall Drill through firewall using mount guide put 4-40 blind keeper nuts behind firewall Its good idea put some Vaseline nut threads some point will have drill shallow holes firewall make room heads engine backplate bolts Provisions fuel tank should made before going further built round metal tank hold 1 oz fuel has pressure line front top two lines going bottom rearone fuel feed other engine flood-off prefer pen bladder pacifier tank should build fuel-proof oompart meat tube point Seal wood epoxy glue cover well clear epoxy paint glue will stand up raw high-nitro fuel install firewall system first cut -in-thick hard balsa block fit snugly inside tube epoxy block rear firewall engine mounting plate attached firewall straightedge mounted place prop align engine centerline tube epoxy-glue firewall engine still attached will have cut off engine lugs plan use halfcowl backplate mount dont like backplate mount conventional aluminum beani mount will work fine will give front end crowded will also about 20 grams heavier convert beam mount note will need shift pylon forward about t tail surfaces forward same amount maintain same moments either mounting system bend skid Lon top sink firewall held place mount will twist Pylon Build over plans noting four main supports made spruce go way bottom tube aluminum wing plate bevel underside edges improves stream lining over traditional full-length wood mount held pylon two 4-40 flat-head screws countersunk alu minum anchored blind nuts small threaded aluminum bar inside pylon pylon skeleton sheeted -in medium balsa two small A2 ply dou blers added outside sheeting under neath aluminum wing plate support top pylon has small plywood insets front back accept holes blind wing keys pylon longer wing chord allow wing find its natural resting place tied down rubberbands should keyed position Continued page 152 80 Model Aviation p ONLY MODEL SUPPLY w%4 203 5750916 Flight-Proven Designs Tep 203 3931990 Balsa ConstructIon 56 lbs Cessna 150 40 Powered 62 sy ConstructIon 110-16 hrsJ Stable PIlars Mooney 40 Powered 62 le Uk Appearance Slow PlyIng CapabIlItIes Cherokee 40 Powered 60 ea plus $250 UPS /e Scale test Proven place Cherokee 200 plus 600 shIppIng Ken Barnes Cessna 15025 Powered 50 plus *250 UPS NEW Firemaster Bipa56 6A-7 lbs. 60 Powered 6996 llntroductory PrIcel NEW Pack Kat 25 powered sport flyer low wIng span 44 Intro PrIce $2600 MasterCard e VISA Coming Soon 60 Powered Pattern Ships Dealers Invited S aV0 Old limer0 psrtS 0jqU La syatteS Chel1WOlFrom this. - to riorS Point6 InltioZ Engine Parts Only Over 600 items Send $200 current catalog PRO TECHTOR PRO GMOUNT painted black finishing touches have put its time attach engines Make sure put offset washers under both engines per plans assure proper line tension have doubts about engines put stronger inboard side After mounting engines check sure model balances CG point shown plans Balancing front point nose-heaviness okay add nose weight balances aft tail-heaviness Flying Use 35-ft steel lines Start inboard engine first outboard doesnt hurt run outboard engine tad rich side both engines running top off fuel inboard engine helps ensure outboard engine will run out fuel first both engines running model will jump air after short takeoff run flies fairly fast reasonably maneuverable model has no problem flying engine although maneuvers should attempted stopped model designed use two 049 Cox Babe Bee engines though other va rieties Cox 049 engines could sub stituted fact pictures show different engines first day test flying Babe Bees developed fuel leak replaced Babe Bees two other Cox 049s Black Widow Dragon fly replacements provided some extra power longer running times though no doubt plane would fly almost well Babe Bees model has met expecta tions enjoy sound two engines synch ability model make fast laps ground holding downelevator before taking off Twins lot fun model easy way try twin minimum investment FF Indoor/Tenny Continued page 74 prop driven few turns short motor sure problem caused shaft/spar joint having brok en loose Correct other problems find tweaking wherever necessary Automatic-centering hooks can made ways favorite shown Figure 2 side view shows traditional round hook shaft centerline passing through center hook end view shows form back edge hook curve bend tends force rubber toward center hook rather riding up crooked knot hook easily formed using round nose pliers make round hook Dashed lines side view show grip hook conventional needle-nose duck-bill pliers form S curve Align tips round-nose pliers shaft centerline twist clock wise make 5 curve take two tries get just right curve since music wire tends spring back After getting 5 curve just right inspect hook closely sure alignment has changed Use prop-pitch gauge measure pitch both blades sure both blades same angle gauge adjustable check pitch angles two three places blade sure blade twist equal both blades photos shows adjustable prop-pitch gauge being used check setting torque-variable-pitch prop care make own gauge note following features 1 The prop shaft provided fixed reference point insure exact meas urements 2 Provision made measure blade angle one-inch intervals Both blades must checked same radius angles must match closely 3 The blade-angle protractor should have increments degree con structed solidly enough insure repeat able measurements Repairs made damaged prop blades must carefully made avoid changes stiffness structure particular application skin glue fracture prop spar can affect flaring char acteristics prop Cyanoacrylate glue can also stiffen structure unless used sparingly Finally damaged all-balsa blades must very carefully repaired restore exact blade shape Two other photos show two extremes illustrate concepts involved Boston ian prop very deep camber curv ature Any damage changes camber will obviously affect well prop runs will incautious application glue shrinks thereby pulling additional camber photo Stan Chiltons Easy Bs gives clear view full-length prop spars Stan uses very soft light wood sanded very thin prop blades full-length spar necessary control blades under power allow model ceilingscrub damaging prop blades Repair type prop very delicate must done block used build prop initially Next time prop wobble issue will carried construction techniques minimize prop wobble other ineffi ciencies Bud Tenny PO Box S4S Richardson TX 75080 Humminbird/Caton Continued page 80 use straightedge find mark atop centerline tube lay straight piece wood almost thickness pylon along top centerline sight down toward tail aid checking alignment satisfied mark side straightedge cut through tube pylon will fit hole Note part tube above tank com partment should cut walls pylon will have fitted top tube area two spruce supports straddling tank compartment very important step setting proper incidence pylon Measure top rear pylon centerline side tube rear 152 Model Aviation TRANSMITTER CASE. trong thermo molded metal framed soft foam filled 901205 carryIng case best market SCans mitter Price 3250 Add 5250 shippIng Alaska Hawaii 450 ENGINE MOUNTS. fully machIned 6061T6 alsmlns brIghtly pellshof reteiSed mounting holes 60s 1205 Os 61000161 6581 OPt 60 VS 61 115 Os 60 50 90 Enya 60 los cyslos 122 Soya 90120 OS 120 foor sysles $25 Add 1150 ship Ca AK & III 5300 FIBERGLASS COWLS 70 cowls eelpants Sig Pica Top-Filte Jemco Nosen Pilot Stafford Radlais Behrens Garmhausen W E Tech other kits plans Onepiece laminated construction handlaid fIberglass strong hut lightweight Send BASE price list please Include names models interested parts br call between 9AM 9 PM EDT information COD ordering hope hear yout 5IBERGLASS ASTER 703 890-6017 Ospi MA 59 1 1st 530 Goodviec VA 24095 SASE FOR FREE cATALOGcA RESADD6 BERGERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 us can get completely true-running prop single bearing Shaft/spar misalign ment can spotted easily side TOLEDO THIRTY-SECOND ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 11 12 & 13 1986 presented Weak Signals R/C Club Toledo Ohio Exposition information available contacting Wayne Yeager co-director ticket address shown below ADVANCE TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon instead stamps Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $4 QOperday adults $100 per day children 12 under Ticket sales final non-refundable tickets along program will returned near mid-March COMPETITION CLASSES NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models HELICOPTER R/C CAR COMPETITION BOAT MILITARY SCALE BOAT PLEASURE POWER BOAT WORKING VESSEL-UNARMED distance should 31/16 measure top front pylon centerline front should 3 important thing relationship measurements front pylon should 1/16 %4 higher rear Get good pylon fit making sure main supports touch bottom tube Dont glue place yet Half-cowl Building straightforward hard select aluminum spinner backplate size want front cowl Make round piywood nose piece 2 ply sheet cutting just slightly larger spinner backplate cut large hole engine shaft pass through Tack-glue 1/n-in spacer spinner backplate Glue plywood nose piece spacer mount engine complete prop nose piece will become front end cowl already its final position proper spinner clearance Note firewall larger tube Wrap tube layer 1/16 balsa fill area fill extending about 2 back beveled rear construct cowl stringers first cut three strips spruce 6 long Run first strip nose piece down centerline left side tube CyA-glue spots holding place apply slow-curing epoxy around firewall stress points Repeat right side tube bottom produces outline cowl can filled medium balsa After stringers press soft balsa gaps hold CyA glue usually apply some thin slow-curing epoxy point make sure bond close remaining cracks strong filler Sand cowl its final shape coarse sandpaper block bringing front end down size spinner fairing rear stringers tube note will have able get angled Allen wrench between side cowl engine reaching mountingbolts Plan forthis bend spruce stringers around engine now has no lugs Place temporary spacer between side engine spruce maintain access space Wing beefy modified geodetic structure front sheeting take load hot climb top spar wings high point medium-hard /z6 sq balsa pre-cured carbon fiber CyA-glued top bottom make rigid resist impacts dethermalizing ribs cut 4-to 6-lb /32 sheet balsa feel wood little heavy can step down 1Ae sheet wing tip ribs 1/16 top sheeting leading edge over high point spar should weigh about 11 13 grams per 3 x 36-in sheet construction sequence use Notch trailing edge pin over plans Laminate leading edge pin down Pin bottom spar place Use piece Y16 sq wood make sure notches ribs deep enough set ribs over bottom spar ribs too long too short make adjust ments leading trailing edge CyA-glue ribs place add top spar end ribs wing panel can slanted match angle dihedral breaks cut some templates angle can establish correct di hedral build eliminate awful chore trying sand later Add webbing leave off center make room plywood brace will added later wing halves joined Fit glue rear diagonals leaving off front diagonals time being Mark cut 1/16 leading edge sheeting Tack-glue sheet front back rib remove wing plans can make sure sheeting straight along leading edge before gluing com pleted will help avoid washboard effect Continue attaching sheeting ribs CyA giue wing upside down front diagonals can cut trimmed conform contour sheeting wing tip construction same main panel except making An exact scale reproduction worlds successful Ultra Light aircraft Same material construction full scale aircraft Light enough electric power info pack send $1 stamped self ad dressed envelope Gene C Head aRt 10 Box 342 S Portsmouth KY 41174 April 1986 153 READY NOW Modelers Choice GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz $595 Kwik Set 6 Minute10 Os $995 Giant Kwik Set 6 Minute16 os$1395 Half FastlOMinutelOoz$995 GMP AIRCRAFT INSTRUMENTS 80 31161143181/2$ 149 40 3/4 inch $ 149 EASY OFF PULLER proper tool removing drive washeraand flywheels $ 795 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 513 385-7398 net year duder engr irect Fast B fluid add $150 020 Engines Free-Flight Rubber Pulse small Multi Channel R/C systems suitable 50 years ago mas very capable aircraft usell $2195 proportiosed stable model fligOt interestiog desigs boding itself balsa Structural techoigues KIT 002 Weve got eflole sour lavorites Please seed 505 Flyllee CetolegPhOne 17031 273-9093 Scalers 0113 OiStrnulerS ruimed FLYLINE MODELS INC PO Box 2136 Fairfax virginia 22031 curved leading trailing edges Stick about dozen pins behind leading edge plan line bend strip wood around pins Add next lamination tackglue place bend around curve leave strips extra length can bent around curve easily form trailing edge use straight edge cut about four slits outermost eight inches bend strips time around pins Again helps have extra wood length Both leading trailing edges should removed sanded flat before proceeding same con struction sequence used main panel fitting curved top sheeting easy turn tip upside down over sheet use fine-tip pen mark sheet along curve leading edge along curve aft side high point spar Cut out along outside marks fit place After panels built before joined together roughly trim leading edge knife leaving enough can form final shape coarse sandpaper block accuracy front airfoil freehand proposition easy become tired happens put work aside until later Im fresh enough give atten tion deserves trailing edge will need some coarse sanding bring down size overall sanding shaping wing can done large sanding block about 4 x 9 inso high spots along diagonals sheeting can brought line ribs airfoil references point Sandpaper 220-grit works well final smoothing can done 400-grit paper Join tips main panels 5min epoxy check again correct amount dihedral youve made mistake can heat epoxy covering iron until begins gas off will release outer joints have no brace just cover front joint back spar 34-oz glass cloth clear epoxy paint same top bottom trailing edge put two coats dope spot covered stick down glass thinner After dries use clear epoxy paint double cloth weight wing center section after inserting carbon fiber brace leading trail ing edges Once wing joined center cut out plywood wing support counter sink 6 bottom wing structure Next add main ply dihedral brace also serves foundation wing support Add 1/32 plywood braces around center rib spars making sure extend past end wing support run almost full height rib Use epoxy assembly because takes wing load dethermalized landings Stabilizer Construction identical wing word about weight might helpful try use 9- 11-gram sheet wood ribs top sheeting desirable have finished weight uncovered stab structure under 1 oz makes CG much easier control stab comes out heavier want cover lighter polyester film can reduce tail weight much 10 grams choosing lightest covering Setting up final assembly After cov ering wing stab temporarily mount everything rudder stab mount en gine prop pylon wing stab hold together rubberbands Place piece masking tape over center wing mark 68% chord hang model rubberbands Shift pylon slightly fine-tune proper CG remember slide stab pylon keep same moment relation ship set CG 2% 3% ahead 68% because paint final finishing usually move about amount Its time glue pylon epoxy stab mount vertical fin cover fin pylon half-cowl oz glass cloth because easier put good finish cloth cover up wood grain After sticking cloth dope thinner put two coats clear epoxy paint After dries mix dope talcum powder fairly thick grainy consistency paint two three coats dries hour less Sand off filler 220-grit paper repeat filler application/sanding until looks smooth ending up 320 400-grit paper fuselage sprayed epoxy color paint withstand high nitro fuels number VIT arrangements will work well shown photos dependable pull rubberbands tight stab endand have enough tension spring timer hold stab down under power stretching rubberbands hold stab trip line DT release No matter system someone new VIT chooses please understand require careful attention engineerin testing aspects possible something hang up pull loose can count happening Anything suspect needs changed anything changed needs tested 10 times today 10 times tomorrow want faster plane independent power glide trim VIT/AR way go Test flying Make sure engine run ning reliably test flood-off system VIT again before trying fly Check Y16-in washin right main panel Test glide slight left turn power settings enough negative stab incidence keep plane diving hand glide Use instant DT set 2-sec delay set 2- 3-sec engine run launch high right wing slightly low trim prop plan compete run engine peak rpm because trimming slow props rich engine means will have over again start going fast get ready let plane glide remember requires quite bit additional negative stab incidence Mine uses about er should trip right glide built first high-performance model article like Ive loved fast Free Flight ever since decide build Humminbird put some green somewhere help prove green airplanes fly 154 Model Aviation
Edition: Model Aviation - 1986/04
Page Numbers: 76, 77, 78, 79, 80, 152, 153, 154
NO OCR TEXT plane designed variableincidence stab auto-rudder re quires large amount negative stab incidence glide stab setting permitted CG placement responsible models good recovery characteristicsin conjunction rud der turn Stab tilt wont job plane version Humminbird VIT/AR should expected fly significant changes 35 engine set up flat backplate mount 00—no side thrust downthrust Under power angular dif ference betwen wing stab set about 1 0 slight amount left rudder necessary right main panel wing has /16 washin other panels being flat washin adds left rolling action helps keep planes nose up turns right under power Left This view shows ciean lines modei its smaii tubuiar fusciage made roiled balsa carbon fiber stiffeners running iengthwise between baisa laminations Right Though hand-held i about what youll see model l flight dis tinguished swept-back elliptical lines Green panels show up well against sky white wing tips easy see grass Len comorrum sisoimizer nouses ins arnnrmizr TUE nuur tub. mm IUIUUUU mium end dethermalizing stabilizer sliding up line Right Stab construction must beery win ihe thin airfoil curved trailing edge made slitting balsa bending around pins gluing isa stab lighter Class version Before covering weighed 19 grams Left Authois homemade timer plate uses reliable K-Mart camera timer front wire flood-off bottom line monofila ment rudder release top spring stab trip Note adjustable metal piate determines height stab trip Right Humminbirds half-cowl produces neat front end helps streamlining Note restraint line flood-off attached tothe engine Oversized intake maximizes power benefits pressurefuel supply Landing skid fits behind backplate mount April 1986 77 Rolled-tube fuselage under construction Carbon fiber strips being applied 1/16 sheet balsa Second lamination already has shaped sliding over first layer glide circle medium-large right Humminbird designed Cat III flying fast climb essen tial has kind power pattern will hold longer engine runsand kind glide will give other designs hard time other categories Fuselage rolled tube strong crush proof light will warp make tube 48 long two sheets A6 x 4 x 48-in A-grain balsa final weight tube will slightly weight two sheets started use sheets weighing 24 28 grams com pleted tube comes out 55 60 grams Following procedure making rolled tube fuselage Coat pool cue stick neutral color shoe polish wax clamp big end vise stick can used mandrel Spray side balsa sheets water wifes spray bottles handy Let soak few minutes spray again balsa pliable mold sheet around stick use light pressure wont crack Re strain wrapped balsa several 6-in strips masking tape tape will stick itself wet balsa wrap balsa elastic anlde ban dage remove masking tape wrap wood will dry about three hours will need two molded tubes will call B Remove bandage Lay metal straightedge along Tube balsa overlaps cut through both layers Remove excess wood slide tube slightly up mandrel pool cue get best fit seam position fasten Left Author fills homemade metal tank 11/4 oz high-nitro fuel Decorative trim cut out Super MonoKote main MonoKote covering must adhere well balsa surfaces using moderate pressure hot iron prevent warping Modified geo detic wing construction provides needed torsional rigidity Right Under construction can see half-cowl details Strip wood bent around firewall attached ply nose piece temporarily glued back engine spinner alignment 78 Model Aviation wing framework seen trom under side Extra front diagonal brace usually needed Itwas added instance because balsa lighter usual top spar laminated carbon fiber DETAIL edges together cyanoacrylate glue CyA Remove tube mandrel gently twisting back forth probab ly wont straight Feed tube back onto mandrel sand seam fill gaps soft Full-Size Plans Available. See Page 164 balsa cut seven strips pre-cured carbon fiber 3A2 wide 48 long CyA-glue strips evenly-spaced inter vals run length tube straight lines Sand strips 220-grit block Slide Tube B dry uncut over Tube Pull together tightly masking tape cut seam overlaps limiting cut Remove Tube B paintthe inside slow-curing epoxy thinned denatured alcohol consistency thick dope paint outside Tube two coats Slide Tube B back over Tube wrap elastic bandage seam will meet perfectly everywhere ignore let lamination cure least overnight Remove bandage next day fit soft balsa seam gaps Sand leaving seam full balsa dust apply CyA glue will notice some little longitudinal humps caused imbed ded carbon fiber strips Hold 180-grit sand paper hand twist tube other hand sand around circum ference careful let sandpaper edges gouge wood finish tube first coat two coats dope Mist-spray sheet %-oz fiberglass cloth dope will cut easily scissors Stick cloth tube thinner After dries thorough ly apply two coats clear epoxy paint fill grain cloth entire tube-building procedure can done two three hours working time will have find other things between different steps setting up round fuselage draw centerline down left side tube will need reference mounting firewall straight setting correct incidence pylon Engine mount installation power plant needs installed first Cut 116 dia round firewall -in plywood Cut backplate mount 1 diameter 342-in aluminum plate Remove engines backplate center over alu minum mount mark four backplate holes drill size Attach backplate newly-drilled mount engine checking fit Locate four points near edge mount can drill holes attach mount firewallfar enough April 1986 79 Close-up K&B 35 engine shows radial backplate mount shaved lugs Bottom tubing attached pressure tap ilnes up crankshaft opening little device sounds steady beep guide right plane Easily mounts smallest planes Use connector plug receiver same servo Also tells someone frequency solid state crystal oscillator Comes ready mount full structions included WT 1 oz DIM 1 x 2 3/8 x IN USA CLUB DISCOUNTS AVAILABLEI * ASK * SEND CHECK OR MONEY ORDER TO ELECTRONIC DESIGNS INC BOX Z 1925 GREENWOOD LK TPK HEWITT NEW JERSEY 07421 PHONE 201 728-1616 Pius $200 Shipping cant USA NJ Residents add 6% Sales Tax COD add $200 Allow 2 wks Shipping engine heads hex screws will clear side engine puts screw heads almost edge mount Remove mount en gine drill four marked holes 440 hex bolts align aluminum mount over firewall Drill through firewall using mount guide put 4-40 blind keeper nuts behind firewall Its good idea put some Vaseline nut threads some point will have drill shallow holes firewall make room heads engine backplate bolts Provisions fuel tank should made before going further built round metal tank hold 1 oz fuel has pressure line front top two lines going bottom rearone fuel feed other engine flood-off prefer pen bladder pacifier tank should build fuel-proof oompart meat tube point Seal wood epoxy glue cover well clear epoxy paint glue will stand up raw high-nitro fuel install firewall system first cut -in-thick hard balsa block fit snugly inside tube epoxy block rear firewall engine mounting plate attached firewall straightedge mounted place prop align engine centerline tube epoxy-glue firewall engine still attached will have cut off engine lugs plan use halfcowl backplate mount dont like backplate mount conventional aluminum beani mount will work fine will give front end crowded will also about 20 grams heavier convert beam mount note will need shift pylon forward about t tail surfaces forward same amount maintain same moments either mounting system bend skid Lon top sink firewall held place mount will twist Pylon Build over plans noting four main supports made spruce go way bottom tube aluminum wing plate bevel underside edges improves stream lining over traditional full-length wood mount held pylon two 4-40 flat-head screws countersunk alu minum anchored blind nuts small threaded aluminum bar inside pylon pylon skeleton sheeted -in medium balsa two small A2 ply dou blers added outside sheeting under neath aluminum wing plate support top pylon has small plywood insets front back accept holes blind wing keys pylon longer wing chord allow wing find its natural resting place tied down rubberbands should keyed position Continued page 152 80 Model Aviation p ONLY MODEL SUPPLY w%4 203 5750916 Flight-Proven Designs Tep 203 3931990 Balsa ConstructIon 56 lbs Cessna 150 40 Powered 62 sy ConstructIon 110-16 hrsJ Stable PIlars Mooney 40 Powered 62 le Uk Appearance Slow PlyIng CapabIlItIes Cherokee 40 Powered 60 ea plus $250 UPS /e Scale test Proven place Cherokee 200 plus 600 shIppIng Ken Barnes Cessna 15025 Powered 50 plus *250 UPS NEW Firemaster Bipa56 6A-7 lbs. 60 Powered 6996 llntroductory PrIcel NEW Pack Kat 25 powered sport flyer low wIng span 44 Intro PrIce $2600 MasterCard e VISA Coming Soon 60 Powered Pattern Ships Dealers Invited S aV0 Old limer0 psrtS 0jqU La syatteS Chel1WOlFrom this. - to riorS Point6 InltioZ Engine Parts Only Over 600 items Send $200 current catalog PRO TECHTOR PRO GMOUNT painted black finishing touches have put its time attach engines Make sure put offset washers under both engines per plans assure proper line tension have doubts about engines put stronger inboard side After mounting engines check sure model balances CG point shown plans Balancing front point nose-heaviness okay add nose weight balances aft tail-heaviness Flying Use 35-ft steel lines Start inboard engine first outboard doesnt hurt run outboard engine tad rich side both engines running top off fuel inboard engine helps ensure outboard engine will run out fuel first both engines running model will jump air after short takeoff run flies fairly fast reasonably maneuverable model has no problem flying engine although maneuvers should attempted stopped model designed use two 049 Cox Babe Bee engines though other va rieties Cox 049 engines could sub stituted fact pictures show different engines first day test flying Babe Bees developed fuel leak replaced Babe Bees two other Cox 049s Black Widow Dragon fly replacements provided some extra power longer running times though no doubt plane would fly almost well Babe Bees model has met expecta tions enjoy sound two engines synch ability model make fast laps ground holding downelevator before taking off Twins lot fun model easy way try twin minimum investment FF Indoor/Tenny Continued page 74 prop driven few turns short motor sure problem caused shaft/spar joint having brok en loose Correct other problems find tweaking wherever necessary Automatic-centering hooks can made ways favorite shown Figure 2 side view shows traditional round hook shaft centerline passing through center hook end view shows form back edge hook curve bend tends force rubber toward center hook rather riding up crooked knot hook easily formed using round nose pliers make round hook Dashed lines side view show grip hook conventional needle-nose duck-bill pliers form S curve Align tips round-nose pliers shaft centerline twist clock wise make 5 curve take two tries get just right curve since music wire tends spring back After getting 5 curve just right inspect hook closely sure alignment has changed Use prop-pitch gauge measure pitch both blades sure both blades same angle gauge adjustable check pitch angles two three places blade sure blade twist equal both blades photos shows adjustable prop-pitch gauge being used check setting torque-variable-pitch prop care make own gauge note following features 1 The prop shaft provided fixed reference point insure exact meas urements 2 Provision made measure blade angle one-inch intervals Both blades must checked same radius angles must match closely 3 The blade-angle protractor should have increments degree con structed solidly enough insure repeat able measurements Repairs made damaged prop blades must carefully made avoid changes stiffness structure particular application skin glue fracture prop spar can affect flaring char acteristics prop Cyanoacrylate glue can also stiffen structure unless used sparingly Finally damaged all-balsa blades must very carefully repaired restore exact blade shape Two other photos show two extremes illustrate concepts involved Boston ian prop very deep camber curv ature Any damage changes camber will obviously affect well prop runs will incautious application glue shrinks thereby pulling additional camber photo Stan Chiltons Easy Bs gives clear view full-length prop spars Stan uses very soft light wood sanded very thin prop blades full-length spar necessary control blades under power allow model ceilingscrub damaging prop blades Repair type prop very delicate must done block used build prop initially Next time prop wobble issue will carried construction techniques minimize prop wobble other ineffi ciencies Bud Tenny PO Box S4S Richardson TX 75080 Humminbird/Caton Continued page 80 use straightedge find mark atop centerline tube lay straight piece wood almost thickness pylon along top centerline sight down toward tail aid checking alignment satisfied mark side straightedge cut through tube pylon will fit hole Note part tube above tank com partment should cut walls pylon will have fitted top tube area two spruce supports straddling tank compartment very important step setting proper incidence pylon Measure top rear pylon centerline side tube rear 152 Model Aviation TRANSMITTER CASE. trong thermo molded metal framed soft foam filled 901205 carryIng case best market SCans mitter Price 3250 Add 5250 shippIng Alaska Hawaii 450 ENGINE MOUNTS. fully machIned 6061T6 alsmlns brIghtly pellshof reteiSed mounting holes 60s 1205 Os 61000161 6581 OPt 60 VS 61 115 Os 60 50 90 Enya 60 los cyslos 122 Soya 90120 OS 120 foor sysles $25 Add 1150 ship Ca AK & III 5300 FIBERGLASS COWLS 70 cowls eelpants Sig Pica Top-Filte Jemco Nosen Pilot Stafford Radlais Behrens Garmhausen W E Tech other kits plans Onepiece laminated construction handlaid fIberglass strong hut lightweight Send BASE price list please Include names models interested parts br call between 9AM 9 PM EDT information COD ordering hope hear yout 5IBERGLASS ASTER 703 890-6017 Ospi MA 59 1 1st 530 Goodviec VA 24095 SASE FOR FREE cATALOGcA RESADD6 BERGERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 us can get completely true-running prop single bearing Shaft/spar misalign ment can spotted easily side TOLEDO THIRTY-SECOND ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 11 12 & 13 1986 presented Weak Signals R/C Club Toledo Ohio Exposition information available contacting Wayne Yeager co-director ticket address shown below ADVANCE TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon instead stamps Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $4 QOperday adults $100 per day children 12 under Ticket sales final non-refundable tickets along program will returned near mid-March COMPETITION CLASSES NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models HELICOPTER R/C CAR COMPETITION BOAT MILITARY SCALE BOAT PLEASURE POWER BOAT WORKING VESSEL-UNARMED distance should 31/16 measure top front pylon centerline front should 3 important thing relationship measurements front pylon should 1/16 %4 higher rear Get good pylon fit making sure main supports touch bottom tube Dont glue place yet Half-cowl Building straightforward hard select aluminum spinner backplate size want front cowl Make round piywood nose piece 2 ply sheet cutting just slightly larger spinner backplate cut large hole engine shaft pass through Tack-glue 1/n-in spacer spinner backplate Glue plywood nose piece spacer mount engine complete prop nose piece will become front end cowl already its final position proper spinner clearance Note firewall larger tube Wrap tube layer 1/16 balsa fill area fill extending about 2 back beveled rear construct cowl stringers first cut three strips spruce 6 long Run first strip nose piece down centerline left side tube CyA-glue spots holding place apply slow-curing epoxy around firewall stress points Repeat right side tube bottom produces outline cowl can filled medium balsa After stringers press soft balsa gaps hold CyA glue usually apply some thin slow-curing epoxy point make sure bond close remaining cracks strong filler Sand cowl its final shape coarse sandpaper block bringing front end down size spinner fairing rear stringers tube note will have able get angled Allen wrench between side cowl engine reaching mountingbolts Plan forthis bend spruce stringers around engine now has no lugs Place temporary spacer between side engine spruce maintain access space Wing beefy modified geodetic structure front sheeting take load hot climb top spar wings high point medium-hard /z6 sq balsa pre-cured carbon fiber CyA-glued top bottom make rigid resist impacts dethermalizing ribs cut 4-to 6-lb /32 sheet balsa feel wood little heavy can step down 1Ae sheet wing tip ribs 1/16 top sheeting leading edge over high point spar should weigh about 11 13 grams per 3 x 36-in sheet construction sequence use Notch trailing edge pin over plans Laminate leading edge pin down Pin bottom spar place Use piece Y16 sq wood make sure notches ribs deep enough set ribs over bottom spar ribs too long too short make adjust ments leading trailing edge CyA-glue ribs place add top spar end ribs wing panel can slanted match angle dihedral breaks cut some templates angle can establish correct di hedral build eliminate awful chore trying sand later Add webbing leave off center make room plywood brace will added later wing halves joined Fit glue rear diagonals leaving off front diagonals time being Mark cut 1/16 leading edge sheeting Tack-glue sheet front back rib remove wing plans can make sure sheeting straight along leading edge before gluing com pleted will help avoid washboard effect Continue attaching sheeting ribs CyA giue wing upside down front diagonals can cut trimmed conform contour sheeting wing tip construction same main panel except making An exact scale reproduction worlds successful Ultra Light aircraft Same material construction full scale aircraft Light enough electric power info pack send $1 stamped self ad dressed envelope Gene C Head aRt 10 Box 342 S Portsmouth KY 41174 April 1986 153 READY NOW Modelers Choice GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz $595 Kwik Set 6 Minute10 Os $995 Giant Kwik Set 6 Minute16 os$1395 Half FastlOMinutelOoz$995 GMP AIRCRAFT INSTRUMENTS 80 31161143181/2$ 149 40 3/4 inch $ 149 EASY OFF PULLER proper tool removing drive washeraand flywheels $ 795 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 513 385-7398 net year duder engr irect Fast B fluid add $150 020 Engines Free-Flight Rubber Pulse small Multi Channel R/C systems suitable 50 years ago mas very capable aircraft usell $2195 proportiosed stable model fligOt interestiog desigs boding itself balsa Structural techoigues KIT 002 Weve got eflole sour lavorites Please seed 505 Flyllee CetolegPhOne 17031 273-9093 Scalers 0113 OiStrnulerS ruimed FLYLINE MODELS INC PO Box 2136 Fairfax virginia 22031 curved leading trailing edges Stick about dozen pins behind leading edge plan line bend strip wood around pins Add next lamination tackglue place bend around curve leave strips extra length can bent around curve easily form trailing edge use straight edge cut about four slits outermost eight inches bend strips time around pins Again helps have extra wood length Both leading trailing edges should removed sanded flat before proceeding same con struction sequence used main panel fitting curved top sheeting easy turn tip upside down over sheet use fine-tip pen mark sheet along curve leading edge along curve aft side high point spar Cut out along outside marks fit place After panels built before joined together roughly trim leading edge knife leaving enough can form final shape coarse sandpaper block accuracy front airfoil freehand proposition easy become tired happens put work aside until later Im fresh enough give atten tion deserves trailing edge will need some coarse sanding bring down size overall sanding shaping wing can done large sanding block about 4 x 9 inso high spots along diagonals sheeting can brought line ribs airfoil references point Sandpaper 220-grit works well final smoothing can done 400-grit paper Join tips main panels 5min epoxy check again correct amount dihedral youve made mistake can heat epoxy covering iron until begins gas off will release outer joints have no brace just cover front joint back spar 34-oz glass cloth clear epoxy paint same top bottom trailing edge put two coats dope spot covered stick down glass thinner After dries use clear epoxy paint double cloth weight wing center section after inserting carbon fiber brace leading trail ing edges Once wing joined center cut out plywood wing support counter sink 6 bottom wing structure Next add main ply dihedral brace also serves foundation wing support Add 1/32 plywood braces around center rib spars making sure extend past end wing support run almost full height rib Use epoxy assembly because takes wing load dethermalized landings Stabilizer Construction identical wing word about weight might helpful try use 9- 11-gram sheet wood ribs top sheeting desirable have finished weight uncovered stab structure under 1 oz makes CG much easier control stab comes out heavier want cover lighter polyester film can reduce tail weight much 10 grams choosing lightest covering Setting up final assembly After cov ering wing stab temporarily mount everything rudder stab mount en gine prop pylon wing stab hold together rubberbands Place piece masking tape over center wing mark 68% chord hang model rubberbands Shift pylon slightly fine-tune proper CG remember slide stab pylon keep same moment relation ship set CG 2% 3% ahead 68% because paint final finishing usually move about amount Its time glue pylon epoxy stab mount vertical fin cover fin pylon half-cowl oz glass cloth because easier put good finish cloth cover up wood grain After sticking cloth dope thinner put two coats clear epoxy paint After dries mix dope talcum powder fairly thick grainy consistency paint two three coats dries hour less Sand off filler 220-grit paper repeat filler application/sanding until looks smooth ending up 320 400-grit paper fuselage sprayed epoxy color paint withstand high nitro fuels number VIT arrangements will work well shown photos dependable pull rubberbands tight stab endand have enough tension spring timer hold stab down under power stretching rubberbands hold stab trip line DT release No matter system someone new VIT chooses please understand require careful attention engineerin testing aspects possible something hang up pull loose can count happening Anything suspect needs changed anything changed needs tested 10 times today 10 times tomorrow want faster plane independent power glide trim VIT/AR way go Test flying Make sure engine run ning reliably test flood-off system VIT again before trying fly Check Y16-in washin right main panel Test glide slight left turn power settings enough negative stab incidence keep plane diving hand glide Use instant DT set 2-sec delay set 2- 3-sec engine run launch high right wing slightly low trim prop plan compete run engine peak rpm because trimming slow props rich engine means will have over again start going fast get ready let plane glide remember requires quite bit additional negative stab incidence Mine uses about er should trip right glide built first high-performance model article like Ive loved fast Free Flight ever since decide build Humminbird put some green somewhere help prove green airplanes fly 154 Model Aviation
Edition: Model Aviation - 1986/04
Page Numbers: 76, 77, 78, 79, 80, 152, 153, 154
NO OCR TEXT plane designed variableincidence stab auto-rudder re quires large amount negative stab incidence glide stab setting permitted CG placement responsible models good recovery characteristicsin conjunction rud der turn Stab tilt wont job plane version Humminbird VIT/AR should expected fly significant changes 35 engine set up flat backplate mount 00—no side thrust downthrust Under power angular dif ference betwen wing stab set about 1 0 slight amount left rudder necessary right main panel wing has /16 washin other panels being flat washin adds left rolling action helps keep planes nose up turns right under power Left This view shows ciean lines modei its smaii tubuiar fusciage made roiled balsa carbon fiber stiffeners running iengthwise between baisa laminations Right Though hand-held i about what youll see model l flight dis tinguished swept-back elliptical lines Green panels show up well against sky white wing tips easy see grass Len comorrum sisoimizer nouses ins arnnrmizr TUE nuur tub. mm IUIUUUU mium end dethermalizing stabilizer sliding up line Right Stab construction must beery win ihe thin airfoil curved trailing edge made slitting balsa bending around pins gluing isa stab lighter Class version Before covering weighed 19 grams Left Authois homemade timer plate uses reliable K-Mart camera timer front wire flood-off bottom line monofila ment rudder release top spring stab trip Note adjustable metal piate determines height stab trip Right Humminbirds half-cowl produces neat front end helps streamlining Note restraint line flood-off attached tothe engine Oversized intake maximizes power benefits pressurefuel supply Landing skid fits behind backplate mount April 1986 77 Rolled-tube fuselage under construction Carbon fiber strips being applied 1/16 sheet balsa Second lamination already has shaped sliding over first layer glide circle medium-large right Humminbird designed Cat III flying fast climb essen tial has kind power pattern will hold longer engine runsand kind glide will give other designs hard time other categories Fuselage rolled tube strong crush proof light will warp make tube 48 long two sheets A6 x 4 x 48-in A-grain balsa final weight tube will slightly weight two sheets started use sheets weighing 24 28 grams com pleted tube comes out 55 60 grams Following procedure making rolled tube fuselage Coat pool cue stick neutral color shoe polish wax clamp big end vise stick can used mandrel Spray side balsa sheets water wifes spray bottles handy Let soak few minutes spray again balsa pliable mold sheet around stick use light pressure wont crack Re strain wrapped balsa several 6-in strips masking tape tape will stick itself wet balsa wrap balsa elastic anlde ban dage remove masking tape wrap wood will dry about three hours will need two molded tubes will call B Remove bandage Lay metal straightedge along Tube balsa overlaps cut through both layers Remove excess wood slide tube slightly up mandrel pool cue get best fit seam position fasten Left Author fills homemade metal tank 11/4 oz high-nitro fuel Decorative trim cut out Super MonoKote main MonoKote covering must adhere well balsa surfaces using moderate pressure hot iron prevent warping Modified geo detic wing construction provides needed torsional rigidity Right Under construction can see half-cowl details Strip wood bent around firewall attached ply nose piece temporarily glued back engine spinner alignment 78 Model Aviation wing framework seen trom under side Extra front diagonal brace usually needed Itwas added instance because balsa lighter usual top spar laminated carbon fiber DETAIL edges together cyanoacrylate glue CyA Remove tube mandrel gently twisting back forth probab ly wont straight Feed tube back onto mandrel sand seam fill gaps soft Full-Size Plans Available. See Page 164 balsa cut seven strips pre-cured carbon fiber 3A2 wide 48 long CyA-glue strips evenly-spaced inter vals run length tube straight lines Sand strips 220-grit block Slide Tube B dry uncut over Tube Pull together tightly masking tape cut seam overlaps limiting cut Remove Tube B paintthe inside slow-curing epoxy thinned denatured alcohol consistency thick dope paint outside Tube two coats Slide Tube B back over Tube wrap elastic bandage seam will meet perfectly everywhere ignore let lamination cure least overnight Remove bandage next day fit soft balsa seam gaps Sand leaving seam full balsa dust apply CyA glue will notice some little longitudinal humps caused imbed ded carbon fiber strips Hold 180-grit sand paper hand twist tube other hand sand around circum ference careful let sandpaper edges gouge wood finish tube first coat two coats dope Mist-spray sheet %-oz fiberglass cloth dope will cut easily scissors Stick cloth tube thinner After dries thorough ly apply two coats clear epoxy paint fill grain cloth entire tube-building procedure can done two three hours working time will have find other things between different steps setting up round fuselage draw centerline down left side tube will need reference mounting firewall straight setting correct incidence pylon Engine mount installation power plant needs installed first Cut 116 dia round firewall -in plywood Cut backplate mount 1 diameter 342-in aluminum plate Remove engines backplate center over alu minum mount mark four backplate holes drill size Attach backplate newly-drilled mount engine checking fit Locate four points near edge mount can drill holes attach mount firewallfar enough April 1986 79 Close-up K&B 35 engine shows radial backplate mount shaved lugs Bottom tubing attached pressure tap ilnes up crankshaft opening little device sounds steady beep guide right plane Easily mounts smallest planes Use connector plug receiver same servo Also tells someone frequency solid state crystal oscillator Comes ready mount full structions included WT 1 oz DIM 1 x 2 3/8 x IN USA CLUB DISCOUNTS AVAILABLEI * ASK * SEND CHECK OR MONEY ORDER TO ELECTRONIC DESIGNS INC BOX Z 1925 GREENWOOD LK TPK HEWITT NEW JERSEY 07421 PHONE 201 728-1616 Pius $200 Shipping cant USA NJ Residents add 6% Sales Tax COD add $200 Allow 2 wks Shipping engine heads hex screws will clear side engine puts screw heads almost edge mount Remove mount en gine drill four marked holes 440 hex bolts align aluminum mount over firewall Drill through firewall using mount guide put 4-40 blind keeper nuts behind firewall Its good idea put some Vaseline nut threads some point will have drill shallow holes firewall make room heads engine backplate bolts Provisions fuel tank should made before going further built round metal tank hold 1 oz fuel has pressure line front top two lines going bottom rearone fuel feed other engine flood-off prefer pen bladder pacifier tank should build fuel-proof oompart meat tube point Seal wood epoxy glue cover well clear epoxy paint glue will stand up raw high-nitro fuel install firewall system first cut -in-thick hard balsa block fit snugly inside tube epoxy block rear firewall engine mounting plate attached firewall straightedge mounted place prop align engine centerline tube epoxy-glue firewall engine still attached will have cut off engine lugs plan use halfcowl backplate mount dont like backplate mount conventional aluminum beani mount will work fine will give front end crowded will also about 20 grams heavier convert beam mount note will need shift pylon forward about t tail surfaces forward same amount maintain same moments either mounting system bend skid Lon top sink firewall held place mount will twist Pylon Build over plans noting four main supports made spruce go way bottom tube aluminum wing plate bevel underside edges improves stream lining over traditional full-length wood mount held pylon two 4-40 flat-head screws countersunk alu minum anchored blind nuts small threaded aluminum bar inside pylon pylon skeleton sheeted -in medium balsa two small A2 ply dou blers added outside sheeting under neath aluminum wing plate support top pylon has small plywood insets front back accept holes blind wing keys pylon longer wing chord allow wing find its natural resting place tied down rubberbands should keyed position Continued page 152 80 Model Aviation p ONLY MODEL SUPPLY w%4 203 5750916 Flight-Proven Designs Tep 203 3931990 Balsa ConstructIon 56 lbs Cessna 150 40 Powered 62 sy ConstructIon 110-16 hrsJ Stable PIlars Mooney 40 Powered 62 le Uk Appearance Slow PlyIng CapabIlItIes Cherokee 40 Powered 60 ea plus $250 UPS /e Scale test Proven place Cherokee 200 plus 600 shIppIng Ken Barnes Cessna 15025 Powered 50 plus *250 UPS NEW Firemaster Bipa56 6A-7 lbs. 60 Powered 6996 llntroductory PrIcel NEW Pack Kat 25 powered sport flyer low wIng span 44 Intro PrIce $2600 MasterCard e VISA Coming Soon 60 Powered Pattern Ships Dealers Invited S aV0 Old limer0 psrtS 0jqU La syatteS Chel1WOlFrom this. - to riorS Point6 InltioZ Engine Parts Only Over 600 items Send $200 current catalog PRO TECHTOR PRO GMOUNT painted black finishing touches have put its time attach engines Make sure put offset washers under both engines per plans assure proper line tension have doubts about engines put stronger inboard side After mounting engines check sure model balances CG point shown plans Balancing front point nose-heaviness okay add nose weight balances aft tail-heaviness Flying Use 35-ft steel lines Start inboard engine first outboard doesnt hurt run outboard engine tad rich side both engines running top off fuel inboard engine helps ensure outboard engine will run out fuel first both engines running model will jump air after short takeoff run flies fairly fast reasonably maneuverable model has no problem flying engine although maneuvers should attempted stopped model designed use two 049 Cox Babe Bee engines though other va rieties Cox 049 engines could sub stituted fact pictures show different engines first day test flying Babe Bees developed fuel leak replaced Babe Bees two other Cox 049s Black Widow Dragon fly replacements provided some extra power longer running times though no doubt plane would fly almost well Babe Bees model has met expecta tions enjoy sound two engines synch ability model make fast laps ground holding downelevator before taking off Twins lot fun model easy way try twin minimum investment FF Indoor/Tenny Continued page 74 prop driven few turns short motor sure problem caused shaft/spar joint having brok en loose Correct other problems find tweaking wherever necessary Automatic-centering hooks can made ways favorite shown Figure 2 side view shows traditional round hook shaft centerline passing through center hook end view shows form back edge hook curve bend tends force rubber toward center hook rather riding up crooked knot hook easily formed using round nose pliers make round hook Dashed lines side view show grip hook conventional needle-nose duck-bill pliers form S curve Align tips round-nose pliers shaft centerline twist clock wise make 5 curve take two tries get just right curve since music wire tends spring back After getting 5 curve just right inspect hook closely sure alignment has changed Use prop-pitch gauge measure pitch both blades sure both blades same angle gauge adjustable check pitch angles two three places blade sure blade twist equal both blades photos shows adjustable prop-pitch gauge being used check setting torque-variable-pitch prop care make own gauge note following features 1 The prop shaft provided fixed reference point insure exact meas urements 2 Provision made measure blade angle one-inch intervals Both blades must checked same radius angles must match closely 3 The blade-angle protractor should have increments degree con structed solidly enough insure repeat able measurements Repairs made damaged prop blades must carefully made avoid changes stiffness structure particular application skin glue fracture prop spar can affect flaring char acteristics prop Cyanoacrylate glue can also stiffen structure unless used sparingly Finally damaged all-balsa blades must very carefully repaired restore exact blade shape Two other photos show two extremes illustrate concepts involved Boston ian prop very deep camber curv ature Any damage changes camber will obviously affect well prop runs will incautious application glue shrinks thereby pulling additional camber photo Stan Chiltons Easy Bs gives clear view full-length prop spars Stan uses very soft light wood sanded very thin prop blades full-length spar necessary control blades under power allow model ceilingscrub damaging prop blades Repair type prop very delicate must done block used build prop initially Next time prop wobble issue will carried construction techniques minimize prop wobble other ineffi ciencies Bud Tenny PO Box S4S Richardson TX 75080 Humminbird/Caton Continued page 80 use straightedge find mark atop centerline tube lay straight piece wood almost thickness pylon along top centerline sight down toward tail aid checking alignment satisfied mark side straightedge cut through tube pylon will fit hole Note part tube above tank com partment should cut walls pylon will have fitted top tube area two spruce supports straddling tank compartment very important step setting proper incidence pylon Measure top rear pylon centerline side tube rear 152 Model Aviation TRANSMITTER CASE. trong thermo molded metal framed soft foam filled 901205 carryIng case best market SCans mitter Price 3250 Add 5250 shippIng Alaska Hawaii 450 ENGINE MOUNTS. fully machIned 6061T6 alsmlns brIghtly pellshof reteiSed mounting holes 60s 1205 Os 61000161 6581 OPt 60 VS 61 115 Os 60 50 90 Enya 60 los cyslos 122 Soya 90120 OS 120 foor sysles $25 Add 1150 ship Ca AK & III 5300 FIBERGLASS COWLS 70 cowls eelpants Sig Pica Top-Filte Jemco Nosen Pilot Stafford Radlais Behrens Garmhausen W E Tech other kits plans Onepiece laminated construction handlaid fIberglass strong hut lightweight Send BASE price list please Include names models interested parts br call between 9AM 9 PM EDT information COD ordering hope hear yout 5IBERGLASS ASTER 703 890-6017 Ospi MA 59 1 1st 530 Goodviec VA 24095 SASE FOR FREE cATALOGcA RESADD6 BERGERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 us can get completely true-running prop single bearing Shaft/spar misalign ment can spotted easily side TOLEDO THIRTY-SECOND ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 11 12 & 13 1986 presented Weak Signals R/C Club Toledo Ohio Exposition information available contacting Wayne Yeager co-director ticket address shown below ADVANCE TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon instead stamps Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $4 QOperday adults $100 per day children 12 under Ticket sales final non-refundable tickets along program will returned near mid-March COMPETITION CLASSES NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models HELICOPTER R/C CAR COMPETITION BOAT MILITARY SCALE BOAT PLEASURE POWER BOAT WORKING VESSEL-UNARMED distance should 31/16 measure top front pylon centerline front should 3 important thing relationship measurements front pylon should 1/16 %4 higher rear Get good pylon fit making sure main supports touch bottom tube Dont glue place yet Half-cowl Building straightforward hard select aluminum spinner backplate size want front cowl Make round piywood nose piece 2 ply sheet cutting just slightly larger spinner backplate cut large hole engine shaft pass through Tack-glue 1/n-in spacer spinner backplate Glue plywood nose piece spacer mount engine complete prop nose piece will become front end cowl already its final position proper spinner clearance Note firewall larger tube Wrap tube layer 1/16 balsa fill area fill extending about 2 back beveled rear construct cowl stringers first cut three strips spruce 6 long Run first strip nose piece down centerline left side tube CyA-glue spots holding place apply slow-curing epoxy around firewall stress points Repeat right side tube bottom produces outline cowl can filled medium balsa After stringers press soft balsa gaps hold CyA glue usually apply some thin slow-curing epoxy point make sure bond close remaining cracks strong filler Sand cowl its final shape coarse sandpaper block bringing front end down size spinner fairing rear stringers tube note will have able get angled Allen wrench between side cowl engine reaching mountingbolts Plan forthis bend spruce stringers around engine now has no lugs Place temporary spacer between side engine spruce maintain access space Wing beefy modified geodetic structure front sheeting take load hot climb top spar wings high point medium-hard /z6 sq balsa pre-cured carbon fiber CyA-glued top bottom make rigid resist impacts dethermalizing ribs cut 4-to 6-lb /32 sheet balsa feel wood little heavy can step down 1Ae sheet wing tip ribs 1/16 top sheeting leading edge over high point spar should weigh about 11 13 grams per 3 x 36-in sheet construction sequence use Notch trailing edge pin over plans Laminate leading edge pin down Pin bottom spar place Use piece Y16 sq wood make sure notches ribs deep enough set ribs over bottom spar ribs too long too short make adjust ments leading trailing edge CyA-glue ribs place add top spar end ribs wing panel can slanted match angle dihedral breaks cut some templates angle can establish correct di hedral build eliminate awful chore trying sand later Add webbing leave off center make room plywood brace will added later wing halves joined Fit glue rear diagonals leaving off front diagonals time being Mark cut 1/16 leading edge sheeting Tack-glue sheet front back rib remove wing plans can make sure sheeting straight along leading edge before gluing com pleted will help avoid washboard effect Continue attaching sheeting ribs CyA giue wing upside down front diagonals can cut trimmed conform contour sheeting wing tip construction same main panel except making An exact scale reproduction worlds successful Ultra Light aircraft Same material construction full scale aircraft Light enough electric power info pack send $1 stamped self ad dressed envelope Gene C Head aRt 10 Box 342 S Portsmouth KY 41174 April 1986 153 READY NOW Modelers Choice GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz $595 Kwik Set 6 Minute10 Os $995 Giant Kwik Set 6 Minute16 os$1395 Half FastlOMinutelOoz$995 GMP AIRCRAFT INSTRUMENTS 80 31161143181/2$ 149 40 3/4 inch $ 149 EASY OFF PULLER proper tool removing drive washeraand flywheels $ 795 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 513 385-7398 net year duder engr irect Fast B fluid add $150 020 Engines Free-Flight Rubber Pulse small Multi Channel R/C systems suitable 50 years ago mas very capable aircraft usell $2195 proportiosed stable model fligOt interestiog desigs boding itself balsa Structural techoigues KIT 002 Weve got eflole sour lavorites Please seed 505 Flyllee CetolegPhOne 17031 273-9093 Scalers 0113 OiStrnulerS ruimed FLYLINE MODELS INC PO Box 2136 Fairfax virginia 22031 curved leading trailing edges Stick about dozen pins behind leading edge plan line bend strip wood around pins Add next lamination tackglue place bend around curve leave strips extra length can bent around curve easily form trailing edge use straight edge cut about four slits outermost eight inches bend strips time around pins Again helps have extra wood length Both leading trailing edges should removed sanded flat before proceeding same con struction sequence used main panel fitting curved top sheeting easy turn tip upside down over sheet use fine-tip pen mark sheet along curve leading edge along curve aft side high point spar Cut out along outside marks fit place After panels built before joined together roughly trim leading edge knife leaving enough can form final shape coarse sandpaper block accuracy front airfoil freehand proposition easy become tired happens put work aside until later Im fresh enough give atten tion deserves trailing edge will need some coarse sanding bring down size overall sanding shaping wing can done large sanding block about 4 x 9 inso high spots along diagonals sheeting can brought line ribs airfoil references point Sandpaper 220-grit works well final smoothing can done 400-grit paper Join tips main panels 5min epoxy check again correct amount dihedral youve made mistake can heat epoxy covering iron until begins gas off will release outer joints have no brace just cover front joint back spar 34-oz glass cloth clear epoxy paint same top bottom trailing edge put two coats dope spot covered stick down glass thinner After dries use clear epoxy paint double cloth weight wing center section after inserting carbon fiber brace leading trail ing edges Once wing joined center cut out plywood wing support counter sink 6 bottom wing structure Next add main ply dihedral brace also serves foundation wing support Add 1/32 plywood braces around center rib spars making sure extend past end wing support run almost full height rib Use epoxy assembly because takes wing load dethermalized landings Stabilizer Construction identical wing word about weight might helpful try use 9- 11-gram sheet wood ribs top sheeting desirable have finished weight uncovered stab structure under 1 oz makes CG much easier control stab comes out heavier want cover lighter polyester film can reduce tail weight much 10 grams choosing lightest covering Setting up final assembly After cov ering wing stab temporarily mount everything rudder stab mount en gine prop pylon wing stab hold together rubberbands Place piece masking tape over center wing mark 68% chord hang model rubberbands Shift pylon slightly fine-tune proper CG remember slide stab pylon keep same moment relation ship set CG 2% 3% ahead 68% because paint final finishing usually move about amount Its time glue pylon epoxy stab mount vertical fin cover fin pylon half-cowl oz glass cloth because easier put good finish cloth cover up wood grain After sticking cloth dope thinner put two coats clear epoxy paint After dries mix dope talcum powder fairly thick grainy consistency paint two three coats dries hour less Sand off filler 220-grit paper repeat filler application/sanding until looks smooth ending up 320 400-grit paper fuselage sprayed epoxy color paint withstand high nitro fuels number VIT arrangements will work well shown photos dependable pull rubberbands tight stab endand have enough tension spring timer hold stab down under power stretching rubberbands hold stab trip line DT release No matter system someone new VIT chooses please understand require careful attention engineerin testing aspects possible something hang up pull loose can count happening Anything suspect needs changed anything changed needs tested 10 times today 10 times tomorrow want faster plane independent power glide trim VIT/AR way go Test flying Make sure engine run ning reliably test flood-off system VIT again before trying fly Check Y16-in washin right main panel Test glide slight left turn power settings enough negative stab incidence keep plane diving hand glide Use instant DT set 2-sec delay set 2- 3-sec engine run launch high right wing slightly low trim prop plan compete run engine peak rpm because trimming slow props rich engine means will have over again start going fast get ready let plane glide remember requires quite bit additional negative stab incidence Mine uses about er should trip right glide built first high-performance model article like Ive loved fast Free Flight ever since decide build Humminbird put some green somewhere help prove green airplanes fly 154 Model Aviation
Edition: Model Aviation - 1986/04
Page Numbers: 76, 77, 78, 79, 80, 152, 153, 154
NO OCR TEXT plane designed variableincidence stab auto-rudder re quires large amount negative stab incidence glide stab setting permitted CG placement responsible models good recovery characteristicsin conjunction rud der turn Stab tilt wont job plane version Humminbird VIT/AR should expected fly significant changes 35 engine set up flat backplate mount 00—no side thrust downthrust Under power angular dif ference betwen wing stab set about 1 0 slight amount left rudder necessary right main panel wing has /16 washin other panels being flat washin adds left rolling action helps keep planes nose up turns right under power Left This view shows ciean lines modei its smaii tubuiar fusciage made roiled balsa carbon fiber stiffeners running iengthwise between baisa laminations Right Though hand-held i about what youll see model l flight dis tinguished swept-back elliptical lines Green panels show up well against sky white wing tips easy see grass Len comorrum sisoimizer nouses ins arnnrmizr TUE nuur tub. mm IUIUUUU mium end dethermalizing stabilizer sliding up line Right Stab construction must beery win ihe thin airfoil curved trailing edge made slitting balsa bending around pins gluing isa stab lighter Class version Before covering weighed 19 grams Left Authois homemade timer plate uses reliable K-Mart camera timer front wire flood-off bottom line monofila ment rudder release top spring stab trip Note adjustable metal piate determines height stab trip Right Humminbirds half-cowl produces neat front end helps streamlining Note restraint line flood-off attached tothe engine Oversized intake maximizes power benefits pressurefuel supply Landing skid fits behind backplate mount April 1986 77 Rolled-tube fuselage under construction Carbon fiber strips being applied 1/16 sheet balsa Second lamination already has shaped sliding over first layer glide circle medium-large right Humminbird designed Cat III flying fast climb essen tial has kind power pattern will hold longer engine runsand kind glide will give other designs hard time other categories Fuselage rolled tube strong crush proof light will warp make tube 48 long two sheets A6 x 4 x 48-in A-grain balsa final weight tube will slightly weight two sheets started use sheets weighing 24 28 grams com pleted tube comes out 55 60 grams Following procedure making rolled tube fuselage Coat pool cue stick neutral color shoe polish wax clamp big end vise stick can used mandrel Spray side balsa sheets water wifes spray bottles handy Let soak few minutes spray again balsa pliable mold sheet around stick use light pressure wont crack Re strain wrapped balsa several 6-in strips masking tape tape will stick itself wet balsa wrap balsa elastic anlde ban dage remove masking tape wrap wood will dry about three hours will need two molded tubes will call B Remove bandage Lay metal straightedge along Tube balsa overlaps cut through both layers Remove excess wood slide tube slightly up mandrel pool cue get best fit seam position fasten Left Author fills homemade metal tank 11/4 oz high-nitro fuel Decorative trim cut out Super MonoKote main MonoKote covering must adhere well balsa surfaces using moderate pressure hot iron prevent warping Modified geo detic wing construction provides needed torsional rigidity Right Under construction can see half-cowl details Strip wood bent around firewall attached ply nose piece temporarily glued back engine spinner alignment 78 Model Aviation wing framework seen trom under side Extra front diagonal brace usually needed Itwas added instance because balsa lighter usual top spar laminated carbon fiber DETAIL edges together cyanoacrylate glue CyA Remove tube mandrel gently twisting back forth probab ly wont straight Feed tube back onto mandrel sand seam fill gaps soft Full-Size Plans Available. See Page 164 balsa cut seven strips pre-cured carbon fiber 3A2 wide 48 long CyA-glue strips evenly-spaced inter vals run length tube straight lines Sand strips 220-grit block Slide Tube B dry uncut over Tube Pull together tightly masking tape cut seam overlaps limiting cut Remove Tube B paintthe inside slow-curing epoxy thinned denatured alcohol consistency thick dope paint outside Tube two coats Slide Tube B back over Tube wrap elastic bandage seam will meet perfectly everywhere ignore let lamination cure least overnight Remove bandage next day fit soft balsa seam gaps Sand leaving seam full balsa dust apply CyA glue will notice some little longitudinal humps caused imbed ded carbon fiber strips Hold 180-grit sand paper hand twist tube other hand sand around circum ference careful let sandpaper edges gouge wood finish tube first coat two coats dope Mist-spray sheet %-oz fiberglass cloth dope will cut easily scissors Stick cloth tube thinner After dries thorough ly apply two coats clear epoxy paint fill grain cloth entire tube-building procedure can done two three hours working time will have find other things between different steps setting up round fuselage draw centerline down left side tube will need reference mounting firewall straight setting correct incidence pylon Engine mount installation power plant needs installed first Cut 116 dia round firewall -in plywood Cut backplate mount 1 diameter 342-in aluminum plate Remove engines backplate center over alu minum mount mark four backplate holes drill size Attach backplate newly-drilled mount engine checking fit Locate four points near edge mount can drill holes attach mount firewallfar enough April 1986 79 Close-up K&B 35 engine shows radial backplate mount shaved lugs Bottom tubing attached pressure tap ilnes up crankshaft opening little device sounds steady beep guide right plane Easily mounts smallest planes Use connector plug receiver same servo Also tells someone frequency solid state crystal oscillator Comes ready mount full structions included WT 1 oz DIM 1 x 2 3/8 x IN USA CLUB DISCOUNTS AVAILABLEI * ASK * SEND CHECK OR MONEY ORDER TO ELECTRONIC DESIGNS INC BOX Z 1925 GREENWOOD LK TPK HEWITT NEW JERSEY 07421 PHONE 201 728-1616 Pius $200 Shipping cant USA NJ Residents add 6% Sales Tax COD add $200 Allow 2 wks Shipping engine heads hex screws will clear side engine puts screw heads almost edge mount Remove mount en gine drill four marked holes 440 hex bolts align aluminum mount over firewall Drill through firewall using mount guide put 4-40 blind keeper nuts behind firewall Its good idea put some Vaseline nut threads some point will have drill shallow holes firewall make room heads engine backplate bolts Provisions fuel tank should made before going further built round metal tank hold 1 oz fuel has pressure line front top two lines going bottom rearone fuel feed other engine flood-off prefer pen bladder pacifier tank should build fuel-proof oompart meat tube point Seal wood epoxy glue cover well clear epoxy paint glue will stand up raw high-nitro fuel install firewall system first cut -in-thick hard balsa block fit snugly inside tube epoxy block rear firewall engine mounting plate attached firewall straightedge mounted place prop align engine centerline tube epoxy-glue firewall engine still attached will have cut off engine lugs plan use halfcowl backplate mount dont like backplate mount conventional aluminum beani mount will work fine will give front end crowded will also about 20 grams heavier convert beam mount note will need shift pylon forward about t tail surfaces forward same amount maintain same moments either mounting system bend skid Lon top sink firewall held place mount will twist Pylon Build over plans noting four main supports made spruce go way bottom tube aluminum wing plate bevel underside edges improves stream lining over traditional full-length wood mount held pylon two 4-40 flat-head screws countersunk alu minum anchored blind nuts small threaded aluminum bar inside pylon pylon skeleton sheeted -in medium balsa two small A2 ply dou blers added outside sheeting under neath aluminum wing plate support top pylon has small plywood insets front back accept holes blind wing keys pylon longer wing chord allow wing find its natural resting place tied down rubberbands should keyed position Continued page 152 80 Model Aviation p ONLY MODEL SUPPLY w%4 203 5750916 Flight-Proven Designs Tep 203 3931990 Balsa ConstructIon 56 lbs Cessna 150 40 Powered 62 sy ConstructIon 110-16 hrsJ Stable PIlars Mooney 40 Powered 62 le Uk Appearance Slow PlyIng CapabIlItIes Cherokee 40 Powered 60 ea plus $250 UPS /e Scale test Proven place Cherokee 200 plus 600 shIppIng Ken Barnes Cessna 15025 Powered 50 plus *250 UPS NEW Firemaster Bipa56 6A-7 lbs. 60 Powered 6996 llntroductory PrIcel NEW Pack Kat 25 powered sport flyer low wIng span 44 Intro PrIce $2600 MasterCard e VISA Coming Soon 60 Powered Pattern Ships Dealers Invited S aV0 Old limer0 psrtS 0jqU La syatteS Chel1WOlFrom this. - to riorS Point6 InltioZ Engine Parts Only Over 600 items Send $200 current catalog PRO TECHTOR PRO GMOUNT painted black finishing touches have put its time attach engines Make sure put offset washers under both engines per plans assure proper line tension have doubts about engines put stronger inboard side After mounting engines check sure model balances CG point shown plans Balancing front point nose-heaviness okay add nose weight balances aft tail-heaviness Flying Use 35-ft steel lines Start inboard engine first outboard doesnt hurt run outboard engine tad rich side both engines running top off fuel inboard engine helps ensure outboard engine will run out fuel first both engines running model will jump air after short takeoff run flies fairly fast reasonably maneuverable model has no problem flying engine although maneuvers should attempted stopped model designed use two 049 Cox Babe Bee engines though other va rieties Cox 049 engines could sub stituted fact pictures show different engines first day test flying Babe Bees developed fuel leak replaced Babe Bees two other Cox 049s Black Widow Dragon fly replacements provided some extra power longer running times though no doubt plane would fly almost well Babe Bees model has met expecta tions enjoy sound two engines synch ability model make fast laps ground holding downelevator before taking off Twins lot fun model easy way try twin minimum investment FF Indoor/Tenny Continued page 74 prop driven few turns short motor sure problem caused shaft/spar joint having brok en loose Correct other problems find tweaking wherever necessary Automatic-centering hooks can made ways favorite shown Figure 2 side view shows traditional round hook shaft centerline passing through center hook end view shows form back edge hook curve bend tends force rubber toward center hook rather riding up crooked knot hook easily formed using round nose pliers make round hook Dashed lines side view show grip hook conventional needle-nose duck-bill pliers form S curve Align tips round-nose pliers shaft centerline twist clock wise make 5 curve take two tries get just right curve since music wire tends spring back After getting 5 curve just right inspect hook closely sure alignment has changed Use prop-pitch gauge measure pitch both blades sure both blades same angle gauge adjustable check pitch angles two three places blade sure blade twist equal both blades photos shows adjustable prop-pitch gauge being used check setting torque-variable-pitch prop care make own gauge note following features 1 The prop shaft provided fixed reference point insure exact meas urements 2 Provision made measure blade angle one-inch intervals Both blades must checked same radius angles must match closely 3 The blade-angle protractor should have increments degree con structed solidly enough insure repeat able measurements Repairs made damaged prop blades must carefully made avoid changes stiffness structure particular application skin glue fracture prop spar can affect flaring char acteristics prop Cyanoacrylate glue can also stiffen structure unless used sparingly Finally damaged all-balsa blades must very carefully repaired restore exact blade shape Two other photos show two extremes illustrate concepts involved Boston ian prop very deep camber curv ature Any damage changes camber will obviously affect well prop runs will incautious application glue shrinks thereby pulling additional camber photo Stan Chiltons Easy Bs gives clear view full-length prop spars Stan uses very soft light wood sanded very thin prop blades full-length spar necessary control blades under power allow model ceilingscrub damaging prop blades Repair type prop very delicate must done block used build prop initially Next time prop wobble issue will carried construction techniques minimize prop wobble other ineffi ciencies Bud Tenny PO Box S4S Richardson TX 75080 Humminbird/Caton Continued page 80 use straightedge find mark atop centerline tube lay straight piece wood almost thickness pylon along top centerline sight down toward tail aid checking alignment satisfied mark side straightedge cut through tube pylon will fit hole Note part tube above tank com partment should cut walls pylon will have fitted top tube area two spruce supports straddling tank compartment very important step setting proper incidence pylon Measure top rear pylon centerline side tube rear 152 Model Aviation TRANSMITTER CASE. trong thermo molded metal framed soft foam filled 901205 carryIng case best market SCans mitter Price 3250 Add 5250 shippIng Alaska Hawaii 450 ENGINE MOUNTS. fully machIned 6061T6 alsmlns brIghtly pellshof reteiSed mounting holes 60s 1205 Os 61000161 6581 OPt 60 VS 61 115 Os 60 50 90 Enya 60 los cyslos 122 Soya 90120 OS 120 foor sysles $25 Add 1150 ship Ca AK & III 5300 FIBERGLASS COWLS 70 cowls eelpants Sig Pica Top-Filte Jemco Nosen Pilot Stafford Radlais Behrens Garmhausen W E Tech other kits plans Onepiece laminated construction handlaid fIberglass strong hut lightweight Send BASE price list please Include names models interested parts br call between 9AM 9 PM EDT information COD ordering hope hear yout 5IBERGLASS ASTER 703 890-6017 Ospi MA 59 1 1st 530 Goodviec VA 24095 SASE FOR FREE cATALOGcA RESADD6 BERGERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 us can get completely true-running prop single bearing Shaft/spar misalign ment can spotted easily side TOLEDO THIRTY-SECOND ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 11 12 & 13 1986 presented Weak Signals R/C Club Toledo Ohio Exposition information available contacting Wayne Yeager co-director ticket address shown below ADVANCE TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon instead stamps Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $4 QOperday adults $100 per day children 12 under Ticket sales final non-refundable tickets along program will returned near mid-March COMPETITION CLASSES NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models HELICOPTER R/C CAR COMPETITION BOAT MILITARY SCALE BOAT PLEASURE POWER BOAT WORKING VESSEL-UNARMED distance should 31/16 measure top front pylon centerline front should 3 important thing relationship measurements front pylon should 1/16 %4 higher rear Get good pylon fit making sure main supports touch bottom tube Dont glue place yet Half-cowl Building straightforward hard select aluminum spinner backplate size want front cowl Make round piywood nose piece 2 ply sheet cutting just slightly larger spinner backplate cut large hole engine shaft pass through Tack-glue 1/n-in spacer spinner backplate Glue plywood nose piece spacer mount engine complete prop nose piece will become front end cowl already its final position proper spinner clearance Note firewall larger tube Wrap tube layer 1/16 balsa fill area fill extending about 2 back beveled rear construct cowl stringers first cut three strips spruce 6 long Run first strip nose piece down centerline left side tube CyA-glue spots holding place apply slow-curing epoxy around firewall stress points Repeat right side tube bottom produces outline cowl can filled medium balsa After stringers press soft balsa gaps hold CyA glue usually apply some thin slow-curing epoxy point make sure bond close remaining cracks strong filler Sand cowl its final shape coarse sandpaper block bringing front end down size spinner fairing rear stringers tube note will have able get angled Allen wrench between side cowl engine reaching mountingbolts Plan forthis bend spruce stringers around engine now has no lugs Place temporary spacer between side engine spruce maintain access space Wing beefy modified geodetic structure front sheeting take load hot climb top spar wings high point medium-hard /z6 sq balsa pre-cured carbon fiber CyA-glued top bottom make rigid resist impacts dethermalizing ribs cut 4-to 6-lb /32 sheet balsa feel wood little heavy can step down 1Ae sheet wing tip ribs 1/16 top sheeting leading edge over high point spar should weigh about 11 13 grams per 3 x 36-in sheet construction sequence use Notch trailing edge pin over plans Laminate leading edge pin down Pin bottom spar place Use piece Y16 sq wood make sure notches ribs deep enough set ribs over bottom spar ribs too long too short make adjust ments leading trailing edge CyA-glue ribs place add top spar end ribs wing panel can slanted match angle dihedral breaks cut some templates angle can establish correct di hedral build eliminate awful chore trying sand later Add webbing leave off center make room plywood brace will added later wing halves joined Fit glue rear diagonals leaving off front diagonals time being Mark cut 1/16 leading edge sheeting Tack-glue sheet front back rib remove wing plans can make sure sheeting straight along leading edge before gluing com pleted will help avoid washboard effect Continue attaching sheeting ribs CyA giue wing upside down front diagonals can cut trimmed conform contour sheeting wing tip construction same main panel except making An exact scale reproduction worlds successful Ultra Light aircraft Same material construction full scale aircraft Light enough electric power info pack send $1 stamped self ad dressed envelope Gene C Head aRt 10 Box 342 S Portsmouth KY 41174 April 1986 153 READY NOW Modelers Choice GMP EPOXIES High Quality Model Construction Jr Kwik Set 6 Minute5 oz $595 Kwik Set 6 Minute10 Os $995 Giant Kwik Set 6 Minute16 os$1395 Half FastlOMinutelOoz$995 GMP AIRCRAFT INSTRUMENTS 80 31161143181/2$ 149 40 3/4 inch $ 149 EASY OFF PULLER proper tool removing drive washeraand flywheels $ 795 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 513 385-7398 net year duder engr irect Fast B fluid add $150 020 Engines Free-Flight Rubber Pulse small Multi Channel R/C systems suitable 50 years ago mas very capable aircraft usell $2195 proportiosed stable model fligOt interestiog desigs boding itself balsa Structural techoigues KIT 002 Weve got eflole sour lavorites Please seed 505 Flyllee CetolegPhOne 17031 273-9093 Scalers 0113 OiStrnulerS ruimed FLYLINE MODELS INC PO Box 2136 Fairfax virginia 22031 curved leading trailing edges Stick about dozen pins behind leading edge plan line bend strip wood around pins Add next lamination tackglue place bend around curve leave strips extra length can bent around curve easily form trailing edge use straight edge cut about four slits outermost eight inches bend strips time around pins Again helps have extra wood length Both leading trailing edges should removed sanded flat before proceeding same con struction sequence used main panel fitting curved top sheeting easy turn tip upside down over sheet use fine-tip pen mark sheet along curve leading edge along curve aft side high point spar Cut out along outside marks fit place After panels built before joined together roughly trim leading edge knife leaving enough can form final shape coarse sandpaper block accuracy front airfoil freehand proposition easy become tired happens put work aside until later Im fresh enough give atten tion deserves trailing edge will need some coarse sanding bring down size overall sanding shaping wing can done large sanding block about 4 x 9 inso high spots along diagonals sheeting can brought line ribs airfoil references point Sandpaper 220-grit works well final smoothing can done 400-grit paper Join tips main panels 5min epoxy check again correct amount dihedral youve made mistake can heat epoxy covering iron until begins gas off will release outer joints have no brace just cover front joint back spar 34-oz glass cloth clear epoxy paint same top bottom trailing edge put two coats dope spot covered stick down glass thinner After dries use clear epoxy paint double cloth weight wing center section after inserting carbon fiber brace leading trail ing edges Once wing joined center cut out plywood wing support counter sink 6 bottom wing structure Next add main ply dihedral brace also serves foundation wing support Add 1/32 plywood braces around center rib spars making sure extend past end wing support run almost full height rib Use epoxy assembly because takes wing load dethermalized landings Stabilizer Construction identical wing word about weight might helpful try use 9- 11-gram sheet wood ribs top sheeting desirable have finished weight uncovered stab structure under 1 oz makes CG much easier control stab comes out heavier want cover lighter polyester film can reduce tail weight much 10 grams choosing lightest covering Setting up final assembly After cov ering wing stab temporarily mount everything rudder stab mount en gine prop pylon wing stab hold together rubberbands Place piece masking tape over center wing mark 68% chord hang model rubberbands Shift pylon slightly fine-tune proper CG remember slide stab pylon keep same moment relation ship set CG 2% 3% ahead 68% because paint final finishing usually move about amount Its time glue pylon epoxy stab mount vertical fin cover fin pylon half-cowl oz glass cloth because easier put good finish cloth cover up wood grain After sticking cloth dope thinner put two coats clear epoxy paint After dries mix dope talcum powder fairly thick grainy consistency paint two three coats dries hour less Sand off filler 220-grit paper repeat filler application/sanding until looks smooth ending up 320 400-grit paper fuselage sprayed epoxy color paint withstand high nitro fuels number VIT arrangements will work well shown photos dependable pull rubberbands tight stab endand have enough tension spring timer hold stab down under power stretching rubberbands hold stab trip line DT release No matter system someone new VIT chooses please understand require careful attention engineerin testing aspects possible something hang up pull loose can count happening Anything suspect needs changed anything changed needs tested 10 times today 10 times tomorrow want faster plane independent power glide trim VIT/AR way go Test flying Make sure engine run ning reliably test flood-off system VIT again before trying fly Check Y16-in washin right main panel Test glide slight left turn power settings enough negative stab incidence keep plane diving hand glide Use instant DT set 2-sec delay set 2- 3-sec engine run launch high right wing slightly low trim prop plan compete run engine peak rpm because trimming slow props rich engine means will have over again start going fast get ready let plane glide remember requires quite bit additional negative stab incidence Mine uses about er should trip right glide built first high-performance model article like Ive loved fast Free Flight ever since decide build Humminbird put some green somewhere help prove green airplanes fly 154 Model Aviation