NO OCR TEXT 4 have re will pose maximum ced 45 pounds p ai ed Ltuyin ce md 35 air time Cha I/16X ALL RIBS L F RC NO OCR TEXT LONOING LIGHTCGT-OLIT 2 REQUIRED lODE WING PLUS FOR POSITION REDUCE ROROER TO FLAT OURFACE I/WIG OR PLYWOOD INSERT OIOL MODIDTEO LANDING REAR SUPPORT BRACKET 0 REGOELEVATORDRONE SERVO MATE FROM NYLON NOSE WHEEL MOUNTINGERVSTIPS-lO SHOWN THROTTLE POSH ROD CA THROST OFFSET LI L 403 RDRGLSA7fl FORMER N 1 4Sg O~lL ERAFYHECI ~1 1 V ROSOER IV SERVO II ID INCH IIIII BELLCRANE KiL4Lii- Th---- hR SHEET WULSA TEMPORARY MOLDING RHUCE FORMER 3 IN 3G Ill I I I/ID SHEET HARDWOOD LANDING GEARI HOLWITING RLOCIS NOTE MOUNT ENLUNE 8TH ST DOWN THRUST DM0 ST RIGHT THRUST SIDE VIEW ODES NOT GROW ANT DOWN THRUST CANT FRONT OF TGWLWG TO AGREE WITH ANGLES SF TRRSSY OFFSET NOTE OGRE LONER PORTION SF FORMERS-S4 U T 8 FROM I/RD I/O DOLOR INST 511/WE OR TEMPLATESTG /8 BALSA FORMER 7OR SHEETFORMER S3132530R BALSA RALOG 3/3251/4 BALSA UTTUER OGRARE STRUTS ST FGSELAGE OSING HARDFORMERS WOOD SPACERD 0415 FRONTFORMER-U C 3/KIN HEGH___________G ALOD HEADREST /30 PLYWOUDWINDSHIELD COWLING I/lU PLYWOOD WING SADOL SPLIT IWOPREIWIGOERYG 2 EACH SIDE IGOFT FOAMREADTURING EGO/HO I]-iPOOHEDGING REMO5E RGLSUIIERHFT INSERT VWRL-Y -DECI WOOD POW I -- I/IN WALGA- ARA5STRUTG -I- L VEPRESENTATISE CYLINDERSGRFACE TO SGRFUCE___________ CRUNREADE IN LOWLINS FORUS CALCULATED___________ BRADY WHIRLWIND 15RUTTERY BOG SCALE ENGINE YfFIAIYD,STS/REII SCALE PROPELLER SIZE- lAO/H DIG/ HP Al FRE ENGINE GROWN 2ROLES FOR 3/KIND3/RG3/R TRIUNGULUR WING MOUNTING DOWELS3/H D3/R MUPLEDALSA INDIDE WING MOGNYING CROSS MEMHERI/IN EPOXY PC ROGRO I-OR LONG CALCULATEDG1I-I/U WIDE DRILL 2 HOLES hR GIG CS1/4 D3/RGI/ID NYLDN MLOCD3/H E TO G POD LANDING DEAR NOTCH I/W DEEP WITH S/H GIRDING DALL AT CENTER FOR RHDEREK K 2j 4 EDIA25/30 HER THICKNESSICC NOTE IWSDE MEGODREMENTT-GRTO DUD II /R#35 OIHLL 030 NOTE 2 STERPLANE WING STRUTS CALCULATED RR2 ISSURFACE TO OSREUCE DYRAL 3/H WIDE TEE ATTUCH POINTS OR WINGS / -S/FOR MER-2 I/A PLYWOOD 04 ALAATTERY DOD 0 OGGO 5/HG VH RADIO SHAdS MINI ROGMSDIFIEO SR DELLERUNK OH AL U CHANNEL I/A WIDE MADE FROM MINFROG SCRAP AL GOD 3/H MAPLE GEFOET SPACER H VA AL S/IN WIDE LENOTH TOSGIT REODIRED CONTROL HORDE BOLT SIDE BY SIDE TO HELLERORN GRILL POR DOD JACK SHAFT SPREE WITH REVLON TURES TOP NOTE WIRE NO3 OGII34ZIGLO FRUTAT SlEW 4/HOV SAYLOR CLEFIG STRUT FITTINGTHRI/ST ASIS ID REQUIRED N 0 0 5 IEM GSLE-i4,MOTTOM OR S PIANO WIRE -I I/A PlYWOOD FACRO SPUD SIGESOHI F BRACE 1 ANGLE EACH END LANDIBO ACAR BOLT FRILL S/IA U FR RAROWOOS INSERTWERBNR B-US SIDE P1501 NERDE FR I/S SALT RUSSIAROFRA FOR STRUT MB-B LOWER WINS BOLTALERIS1 PUSH ROE ALE LOCATIONS/ / IIII 3/ASIA RAROWOOG UTWELS MARE TAO UPPROS 2 IN ION 2/A NULGA SHAPE TO AIRFOIL II~ii /II LOWER WING 3/BUS/B BALSA UPPER WINO test hop builwntnrustl e fuselage blackin quart iling npound angle andMuseum utas derived DC o axis y 9 degrnon Airport Virginia West urn M engine mourn Ige new axis Y tan B e ie cc FIRE example using ved formulas nc Tables thrust C4 e ptnuary 1959 Amer II 1960 Air ing o ar bracinp lower br ously Pu ueI th nt model like mi Chief E ailerons ne lower ng UI isnodels t moving downwar neutral aft th move OSI1I ood way c d yaw Sta Openers/Winter continued page 4 cloaks clock-watchers see some hearts can saddened Like TVs Dangerfield dont get no respect see irony power center AMA Washington Un der by-laws membership elects district vice presidents also Council members Almost far away states caliber people testifies judgment members elected themthey capable As group meet four times year deal best abil ities matters before qualifications businessmen pri vate life impeccable dont defend perfect expected anyone human being perhaps feel no defense FO needed welcome Perhaps make mistakes cannot say Perhaps timing things always brilliant devious calculating po lit icalthey modelers serving volun tarily know believe what decide motivated what feel best Sometimes means Executive Director minority Council meeting happens right Council charge no governmental agency-type Secre tary Washington can Big Brother us what FO about say could receive pink slip simply Recent actions have taken place done some us may drop wayside awhile will go growing Council hear message members call out proceed caution lay out new programs added expenses things members think AMA should Most members above dues increase less cost next weeks fuel buy other magazine almost much AMA asks magazine insurance other benefits others among us ask Should go response few people have ad dressed editor let us keep cool Dues increases however necessary brew negative reactionsnobody willingly ac cepts higher prices cant let ex perts confuse us individual mem bers can make own assessments finally patient readers may say Fine youAMA pays salary answer simply should hope can well other ways like old warhorse FO likes sniff battlefield challenge improve magazine see firmly its way mem bership tool par excellance help AMA grow prosper right know way words used discussion parody Supreme Court deci sions meaning Should everyones cor respondence AMA headquarters plastered billboard present instance publications demand AMA print letter critique logically based upon imagined need shed light some secretive wrong doing AMA has asked account pa per clips sugar cubes etc broken down AMA use Model Aviation use true joke think Watergate Deep Throat Will Judge Jaworski appear doorway Enough already Speaking rights almost 50000 people wanted paid Model Aviation 1978 have Can two critics seriously think people great majority Open mem bers can denied what prefer troubled FO offers words late President Jack Kennedy great enemy truth very ten liedeliberate contrived dishonest mythpersistent persuasive unrealistic Too often hold fast cliches fore-bear ers subject facts prefabricat ed set interpretations enjoy comfort opinion discom fort thought Greatest Show/Howard continued page 13 tions booth several years draws lots interest spec tators AMA represented president Johnny Clemens Larry Bolich special events director Earl Witt secretary-treasurer AMA always very responsive type public exposure could go on about fun fellowship fliers enjoy show photos show much words can tell can see Flying Circus future make plans participate Enjoy hobby Pitcairn/Stott continued page 23 per wing span would have 66 inches An increase over 4 inches upper wing span would have made assembled model airplane too large placed back seat automobile scale model designer builder must decide detailed scale model should decision involves consideration available material time money shop equipment desired usage ability Now Sport Scale Stand-Off Scale gaining popular ity over true scale choice has broadened authors decisions largely compromise based desire fun fly moderately windy weather possibly enter contest requiring exact scale Although model deviates scale selection airfoil slightly larger engine scale plans show true outline except previously noted realistic appearance slightly over-size 2 inch ot Williams Wright Whirlwind J5 installed way largely conceal inverted 60 engine Further streamlining camouflaging engine accomplished fiber glass cowling provide much space around engine possible muffler permit installation battery pack under cowling desired help establish correct CG location resorting- excess dead weight balance common practice remove scalelike engines routine test flights necessary substitute equivalent weight prevent shift CG reason fiberglass cowl engine crankcase formed separate molded parts crankcase form made hard balsa previously used packing crating because its weight balsa cut discs laminated before shaping size During machining observed form tended turn out round lathe due end grain cutting same other grain directions Care taken bring form back round hand work Finally form fitted -in diameter wood-holding dowel centrally located extend axially out back dowel can supported easily vise applying fiber glass No attempt made provide draft taper form diameters since believed fiberglass crank case would have cut form anyway pleasant sur prise easy-does-it method completed fiberglass crankcase removed piece damage either crankcase form method removal follows I Remove thumb tacks held Saran Wrap glass cloth place being coated Hobbypoxy II during placement balloon cover lay-up 2 Trim fiberglass rear outer di ameter assure no fiberglass locks around back corner form rough out front open hole fiber glass cowl removing excess cut away extract thumb tacks operations easier fiber glass has cured two three hours has completely hardened 3 Insert artists flexible palette knife rear form under fiberglass Saran Wrap Japa nese artist paint mixing knife used 92 Model Aviation author 3-in flexible blade tapered thickness 014 inch tip 028 inch handle Also sides knife slightly tapered tip bent upward almost im perceptible amount Slide knife axi ally along surface work 3600 around formthe same way cooks re move cakes layer-cake pans will free fiberglass form Some slight temporary stretching may oc cur Saran Wrap may displaced partially Repeat process until fiberglass crankcase can pulled form author has omitted ba sic details easy-does-it method cause has published Hobby poxy other detailed published articles following comments will assist decision making emphasize certain important details Three layers glass cloth good coatings Hobbypoxy II will make light crankcase five layers glass cloth starting medium weight finishing light weight glass cloth would better Smoother thinner coatings epoxy can applied epoxy kept warm during ap plication means small hair dryer Bubbles can excluded careful ap plication under warm conditions worry about bubblessince mar surface can opened filled later show painted Care should taken prevent roundoff flats crankcase provided mounting engine cylinders can accomplished taping layer foam rubber over deflated balloon press evenly completely around section having flats epoxy hardens use rubber bands re tain foam rubber because will localize pressure too much per manently indent fiberglass Masking tape works well hold foam rubber place engine cowling form made us ing layers scrap plastic foam shaped a sheets laminated front back serve templates prevent distortion rounding front back corners under pressure holding dowel built form After form shaped size author used US Gypsum Top Coat mixed water fill pores plastic foam blend shape form almost dry hard form completely sanded Top Coat easily sanded very rough fully hard ened possible sand easily very slight amount moisture still remains just prior final hardening Top Coat can better job less ex pense compared use filler coating made Tite Bond cement Commercially Top Coat used pre pared wall surfaces cover nail indenta tions joints finish coat can made very smooth Used plastic foam surface strong coating insulates protects plastic foam damage hot air used soften smooth epoxy coating need very thick thinner ap plications preferred reduce number coatings have applied take care shrinkage can occur thick sections Waxing form recommended since Saran Wrap can applied easily shrunk very neatly form After fiberglass work completed flexible palette knife used previously explained help re move cowling damage either cowling form author tried success locally procure balloons large enough easy-does-it method making engine cowling Jumbo-size 16 diameter balloons procured quite big enough cowl ing Therefore usual amount sanding necessary smooth finish word caution attempt ing use easy-does-it method Secure glass cloth well thumb tacks areas cut away prevent shifting due balloon breakage slippage Bal loons little too small may go onto form slip back off again especially back turned doing position loose fiber glass cloth will shifted Following rule thumb balloon least twice big form usually helps prevent trouble sloping shape engine cowling encouraged slippage balloons glance landing gear may tend make potential builder have second thoughts author confesses item did delay start project Happily landing gear came out right first time very little extra effort using four single pieces i/i diam eter piano wire finished product Since landing gear has 12 strut members wire simulates several struts order conserve building time piano wire author played around coat hanger wire develop side gear though calculated angles bends lengths struts paid attention lengths bent wire fit mount ing attach points soft pat tern wires correctly shaped pieces piano wire bent exactly same way Having completed side opposite side gear bent soft wire reversing bends required pieces piano wire bent duplicate side small vise mark ing Kodak negative pencil authors preference pair abrasive cut-off discsmounted arbor chuck Dremel toolwere tools used work piano wire coat hanger wire initially straightened first strut length marked wire allowance bend Having made bend next strut length marked wire al lowance bend process repeated until bends made adjusted meet attach points same procedure used piano wire using soft wire pattern visu al guide During design landing gear noted torsional restraint could utilized strengthen gear rather relying resistance bending alone done use grooved maple landing gear block Top Flite firmly af fixed screws epoxy back bottom edge plywood firewall Also using two other separate pieces short lengths grooved maple blocks tached points provided immediately front leading edge bottom wing front side plywood bulk head number 2 use mounting attach points piano wire started axle bent angle up toward middle firewall mounting block bent lay groove reverse direction exit same side turned up slightly inverted N bent side fuselage bulkhead number 2 Straps screws hold torsional portion groove after wire end plugged side fuselage hard wood separator block shown drawing attached landing gear block prevent shift torsional sections toward middle slipping groove under holding straps second piece wire formed attach rearward cowling near top longeron fuselage bent downward include Oleo strut bent under axle back under lower wing attach near center bottom fuselage rear trailing edge left right upper ends attach through individual Nylon brackets cut single CG Nylon nose-gear bracket bolted back plywood firewall ends held wheel collars rearward ends bent right angles inserted holes drilled 94 Model Aviation SCALE CLASICS Plans & Construction Manual CURTISS HAWK POESTINSON RELIANT BRO V Scale 945 Span S220 V Scale 126 Spat250 2Scale 63 Span S12 2Scale 84Span1500 11tSoale 47VoSpan 1000 l0Soela 63 Span$1260 CURTISS GOSHAWK FIlCO 2 Scale 63 SpanS1S~ CURTISS GULFHAWK lA . 2Soale 63 Span 51600 Scale 94 5pa 63000 Peaee Add 6160 P 040 Foetag sod 0e,dllog. OutSide US Add $300Make alt PSymeete Richard G Barron1213 Holly Spring Ln Grand Blanc MichIgan 48439 Seed Slos Complete toomatlen INSTALL AfidUun FUEL TANK ITS GOOD TO KNOW ITS IN THERE FULL TANK SYSTEM Modelers agree Sullivan has put gether k thats really can now fill tank top bubble allows enough room air tubing fitting neatly inside bubble tanks except smaller 4 oz clude Klapper-Klunk stiff-arm klunk klunk pick-ups se own system NEV-R-LEAK fuel tanks have standard favorite years Made better bubble-top FULL TANK SYSTEM now ll become tanks youll ever want use rectangular piece Epoxy printed cir cuit board attached bottom center area lower wing mounting block notched Nylon strap bolted under through lower wing constrains ends wire holes Epoxy mounting plate Attachment wire looped under axle axle itself matter personal preference author preferring use binding wire sol der made pair aluminum parts Nylon other materials could used instead point counts number bends wires will find number equal little wire gears affix back fire wall due number bends required prevent displacement firewall gear stronger construction others made size wire side tripod struts attaches top Oleo strut Oleo strut together two lower struts likewise forms tripod attaching wheel hub Application dope can expedited using 3-in cubes Polyurethane instead brush Use small aluminum pan margarine container hold dope Soak about dope side cube apply covering slight pressure will feed dope side pores cube reducing drag stroke However first coat silk cube should held off instant encourage slight dryness lightly touched silk ap ply too much dope cause runs Since weight especially tail has detri mental effect flying quality apply minimum amount dopein particular heavier color dope Experience indicated 20 right 20 down thrust would good first ap proximation angles needed straight level flight Offsets base engine mount about 5/32 inch can used bring propeller shaft center cowling better appear ance however should borne mind also offsets engine thrust line will decrease thrust correction angles required angles offsets desired together 20 positive set ting stabilizer should set first test flight Under conditions takeoff flight should accomplished less panic greater safety Hope fully trim adjustments will within limits trim available transmitter Any thought engine mount could machined thrust correction discarded found 148 inch would have removed measured point edge slanted 450 axis vertical 3-in diameter engine mount base Therefore large wedgeshaped aluminum shim form annulus ring washer made drilled provide mounting holes required engine mount installation Fig provides scientific accurate way determining specs making such aluminum wedge suggested 3/16 thick alumi num sheet stock used machining circular wedge shim Machine shim scribe position axis drill mounting holes type shim will produce firmest engine mount support Wing strut landing gear strut angles lengths can calculated similarly using compound angle formulas Simplest way visualize problem draw pyramid corner edge perpen dicular arectangular base longest edge representing strut question perpendicular distance tween attach points bends coordinates base can obtained original drawings accordance scale Projected angles can measured directly drawings unaffected scale Formulas type calculation listed Mechanics Vest Pocket Reference Book full explanation compound angles contained Practical Shop Mathemat ics Vol No 2 J H Wolfe E R Phelps McGraw-Hill After having prepared description good method use applying dope especially silk winter arrived odor dope would have offen sive Coverite applied word February 1 979 95 A Enough space air bubble B Fill tank top C Tube goes up air bubble 12-INCH LENGTH OFSULLI-CONETUBING FREE WITH EVERYTANK ATYPICAL ELEVAT/RuOOER INSlALLATION -xxxx 7G&PLIiIIiNGE COONEY * EASY INSTALLATION * NO AR GAP * FREE MOVEMENT * STRONG AND LIGHTWEIGHT MPLETELY FUELPROOF * COMPATIBLE WITH ALL IRON-ON COVERINGS FOURMOST RACING PRODU CTS 24th Avenue caution black color Coverite used tended bleed yellow Cover ite insignia trim Glaskote later used seal lettering would have prevented color bleeding painted contact surface prior trimming final installation assembly methods devised retaining fuel tank installing muffler providing good looking landing light lens First found square 12ounce Sullivan fuel tank fits nicely quart size cardboard milk carton simple matter cut position hold container place bulkhead #2 flat pieces apple taffy sticks important make installation removable access servos Another good way make engine bulkhead removable firewall complete engine fuel tank Secondly Slim Line Muffler fine engine installation should modified install right angles Beside looking much better muffler can re main engine during assembly removal cowling Viewed side modified muffler appears position imitates air inlet dummy engine Thirdly very realistic looking lens landing lights can made about five minutes Simply acquire pair plastic egg containers wife girl friend has purchased two pair Leggs panty hose Use largest end egg scribe required diameter circle inside spinning small compass Using pair scissors cut crack ing inscribed circle Attach lenses landing lights Pliobond cement record landing lights black dress up piano wire landing gear decided use large size straight plastic soda straws Short pieces black neoprene tubing Sullivan split snapped around wire concentrically space ends split plastic soda straws conceal split straws two concentric straws used splits oriented 1800 apart wire outside split can covered TYPICAL AILERO*J1NSTA L-A ON xX-x 35 length invisible Scotch tape fore after painting Likewise ends can retained wrap same tape Tests proved tape could doped fact dope will stay tape little loss gloss whereas dope may tend flake off smooth plastic straws flexed Sanding straws lightly roughen surface helps flight straws fly off Since Olco struts larger decided use cut off plastic barrel sec tions black felt pens sections pens split lengthwise means Xacto saw snapped over piano wire Concentric spacing accomplished build-up split neoprene tubing Axial shift pieces pens prevented Goo cement rubber like modelers cement author also applies prevent wheel colars com ing off etc preparation flying landing lights scale engine cowl re moved pair 3-in diameter wheels 13-5 propeller installed model balanced 12 ounces lead two 6 ounce sinkers engine mount moved CG forward about 30% location general everything done compen sate unwanted torque effects assure model would fly tail heavy Now happiest reward ing part test flights prototype Frank Stanton friend fellow club member agreed serve test pilot club field Johnsville NADC Warminster PA first check flight complete success Indications less ballast could have used trim adjustments required 50% left rudder trim 100% up elevator trim means transmitter trim ad justments airplane flew well trim changes surfaces second flight became stunt flight Would believe Frank flew large portion rolling circle Barring low sun position Frank probably would have gone way around Allowing fact model being flown very capable flier observers noted excellent manner Pitcairn Mailwing responded flight After test flights Franks comments Its good flying airplane Its piece cake fly next flying session Pitcairn Mailwing flown dressed-up inflight pictures time ballast weight reduced about 8 ounces Two flights flown shoot takeoff fly-by landing pictures surpris ing model did roll fast cause ailerons lower wing no differential utilized Aileron turns good turns made using rudder resulted loss al titude unusual Indications smooth grass fly ing fields would preferable hard sur face runways agreement ground handling original airplane flown landing lights scale engine cowl configuration tends protect damage should ground loop occur propeller sur vived two ground loops hard runways final note author has recently purchased Giant Round Balloons made Mexico distributed through World Toy House balloons look very promising use making large en gine cowls easy-does-it method course modelers should overlook possibility obtaining suitable balloons Hobbypoxy people origi nated method RC Aerobatics/Van Putte continued page 28 does guarantee Novice pattern tro phy enough good fliers around have make very difficult great flier win sport airplane several ways proceed al leviating situation have pitfalls will probably take grass roots movement have much effect pattern flying since major changes rules very infrequent unless widespread demonstration need desire change Contest Di rectors will have make decisions offer competition line proposed rule changes see work out National Society Radio Controlled Aerobatics NS RCA can strong fac tor proposed rule changes NSRCA district vice presidents should given feedback proposed changes issues can aired K Factor monthly newsletter NSRCA arent already NSRCA member send $10 1979 dues Mrs Sally Brown Secretary Treasurer 8534 Huddleston Drive Cincinnati OH 45236 thing has tried Con test Directors contests around coun try has introduction special Novice class beginners pattern com petition large contests have 96 Model Aviation LARGESMALL fit saafoces 1/8 thicker
Edition: Model Aviation - 1979/02
Page Numbers: 16, 17, 18, 19, 20, 21, 22, 23, 92, 94, 95, 96
NO OCR TEXT 4 have re will pose maximum ced 45 pounds p ai ed Ltuyin ce md 35 air time Cha I/16X ALL RIBS L F RC NO OCR TEXT LONOING LIGHTCGT-OLIT 2 REQUIRED lODE WING PLUS FOR POSITION REDUCE ROROER TO FLAT OURFACE I/WIG OR PLYWOOD INSERT OIOL MODIDTEO LANDING REAR SUPPORT BRACKET 0 REGOELEVATORDRONE SERVO MATE FROM NYLON NOSE WHEEL MOUNTINGERVSTIPS-lO SHOWN THROTTLE POSH ROD CA THROST OFFSET LI L 403 RDRGLSA7fl FORMER N 1 4Sg O~lL ERAFYHECI ~1 1 V ROSOER IV SERVO II ID INCH IIIII BELLCRANE KiL4Lii- Th---- hR SHEET WULSA TEMPORARY MOLDING RHUCE FORMER 3 IN 3G Ill I I I/ID SHEET HARDWOOD LANDING GEARI HOLWITING RLOCIS NOTE MOUNT ENLUNE 8TH ST DOWN THRUST DM0 ST RIGHT THRUST SIDE VIEW ODES NOT GROW ANT DOWN THRUST CANT FRONT OF TGWLWG TO AGREE WITH ANGLES SF TRRSSY OFFSET NOTE OGRE LONER PORTION SF FORMERS-S4 U T 8 FROM I/RD I/O DOLOR INST 511/WE OR TEMPLATESTG /8 BALSA FORMER 7OR SHEETFORMER S3132530R BALSA RALOG 3/3251/4 BALSA UTTUER OGRARE STRUTS ST FGSELAGE OSING HARDFORMERS WOOD SPACERD 0415 FRONTFORMER-U C 3/KIN HEGH___________G ALOD HEADREST /30 PLYWOUDWINDSHIELD COWLING I/lU PLYWOOD WING SADOL SPLIT IWOPREIWIGOERYG 2 EACH SIDE IGOFT FOAMREADTURING EGO/HO I]-iPOOHEDGING REMO5E RGLSUIIERHFT INSERT VWRL-Y -DECI WOOD POW I -- I/IN WALGA- ARA5STRUTG -I- L VEPRESENTATISE CYLINDERSGRFACE TO SGRFUCE___________ CRUNREADE IN LOWLINS FORUS CALCULATED___________ BRADY WHIRLWIND 15RUTTERY BOG SCALE ENGINE YfFIAIYD,STS/REII SCALE PROPELLER SIZE- lAO/H DIG/ HP Al FRE ENGINE GROWN 2ROLES FOR 3/KIND3/RG3/R TRIUNGULUR WING MOUNTING DOWELS3/H D3/R MUPLEDALSA INDIDE WING MOGNYING CROSS MEMHERI/IN EPOXY PC ROGRO I-OR LONG CALCULATEDG1I-I/U WIDE DRILL 2 HOLES hR GIG CS1/4 D3/RGI/ID NYLDN MLOCD3/H E TO G POD LANDING DEAR NOTCH I/W DEEP WITH S/H GIRDING DALL AT CENTER FOR RHDEREK K 2j 4 EDIA25/30 HER THICKNESSICC NOTE IWSDE MEGODREMENTT-GRTO DUD II /R#35 OIHLL 030 NOTE 2 STERPLANE WING STRUTS CALCULATED RR2 ISSURFACE TO OSREUCE DYRAL 3/H WIDE TEE ATTUCH POINTS OR WINGS / -S/FOR MER-2 I/A PLYWOOD 04 ALAATTERY DOD 0 OGGO 5/HG VH RADIO SHAdS MINI ROGMSDIFIEO SR DELLERUNK OH AL U CHANNEL I/A WIDE MADE FROM MINFROG SCRAP AL GOD 3/H MAPLE GEFOET SPACER H VA AL S/IN WIDE LENOTH TOSGIT REODIRED CONTROL HORDE BOLT SIDE BY SIDE TO HELLERORN GRILL POR DOD JACK SHAFT SPREE WITH REVLON TURES TOP NOTE WIRE NO3 OGII34ZIGLO FRUTAT SlEW 4/HOV SAYLOR CLEFIG STRUT FITTINGTHRI/ST ASIS ID REQUIRED N 0 0 5 IEM GSLE-i4,MOTTOM OR S PIANO WIRE -I I/A PlYWOOD FACRO SPUD SIGESOHI F BRACE 1 ANGLE EACH END LANDIBO ACAR BOLT FRILL S/IA U FR RAROWOOS INSERTWERBNR B-US SIDE P1501 NERDE FR I/S SALT RUSSIAROFRA FOR STRUT MB-B LOWER WINS BOLTALERIS1 PUSH ROE ALE LOCATIONS/ / IIII 3/ASIA RAROWOOG UTWELS MARE TAO UPPROS 2 IN ION 2/A NULGA SHAPE TO AIRFOIL II~ii /II LOWER WING 3/BUS/B BALSA UPPER WINO test hop builwntnrustl e fuselage blackin quart iling npound angle andMuseum utas derived DC o axis y 9 degrnon Airport Virginia West urn M engine mourn Ige new axis Y tan B e ie cc FIRE example using ved formulas nc Tables thrust C4 e ptnuary 1959 Amer II 1960 Air ing o ar bracinp lower br ously Pu ueI th nt model like mi Chief E ailerons ne lower ng UI isnodels t moving downwar neutral aft th move OSI1I ood way c d yaw Sta Openers/Winter continued page 4 cloaks clock-watchers see some hearts can saddened Like TVs Dangerfield dont get no respect see irony power center AMA Washington Un der by-laws membership elects district vice presidents also Council members Almost far away states caliber people testifies judgment members elected themthey capable As group meet four times year deal best abil ities matters before qualifications businessmen pri vate life impeccable dont defend perfect expected anyone human being perhaps feel no defense FO needed welcome Perhaps make mistakes cannot say Perhaps timing things always brilliant devious calculating po lit icalthey modelers serving volun tarily know believe what decide motivated what feel best Sometimes means Executive Director minority Council meeting happens right Council charge no governmental agency-type Secre tary Washington can Big Brother us what FO about say could receive pink slip simply Recent actions have taken place done some us may drop wayside awhile will go growing Council hear message members call out proceed caution lay out new programs added expenses things members think AMA should Most members above dues increase less cost next weeks fuel buy other magazine almost much AMA asks magazine insurance other benefits others among us ask Should go response few people have ad dressed editor let us keep cool Dues increases however necessary brew negative reactionsnobody willingly ac cepts higher prices cant let ex perts confuse us individual mem bers can make own assessments finally patient readers may say Fine youAMA pays salary answer simply should hope can well other ways like old warhorse FO likes sniff battlefield challenge improve magazine see firmly its way mem bership tool par excellance help AMA grow prosper right know way words used discussion parody Supreme Court deci sions meaning Should everyones cor respondence AMA headquarters plastered billboard present instance publications demand AMA print letter critique logically based upon imagined need shed light some secretive wrong doing AMA has asked account pa per clips sugar cubes etc broken down AMA use Model Aviation use true joke think Watergate Deep Throat Will Judge Jaworski appear doorway Enough already Speaking rights almost 50000 people wanted paid Model Aviation 1978 have Can two critics seriously think people great majority Open mem bers can denied what prefer troubled FO offers words late President Jack Kennedy great enemy truth very ten liedeliberate contrived dishonest mythpersistent persuasive unrealistic Too often hold fast cliches fore-bear ers subject facts prefabricat ed set interpretations enjoy comfort opinion discom fort thought Greatest Show/Howard continued page 13 tions booth several years draws lots interest spec tators AMA represented president Johnny Clemens Larry Bolich special events director Earl Witt secretary-treasurer AMA always very responsive type public exposure could go on about fun fellowship fliers enjoy show photos show much words can tell can see Flying Circus future make plans participate Enjoy hobby Pitcairn/Stott continued page 23 per wing span would have 66 inches An increase over 4 inches upper wing span would have made assembled model airplane too large placed back seat automobile scale model designer builder must decide detailed scale model should decision involves consideration available material time money shop equipment desired usage ability Now Sport Scale Stand-Off Scale gaining popular ity over true scale choice has broadened authors decisions largely compromise based desire fun fly moderately windy weather possibly enter contest requiring exact scale Although model deviates scale selection airfoil slightly larger engine scale plans show true outline except previously noted realistic appearance slightly over-size 2 inch ot Williams Wright Whirlwind J5 installed way largely conceal inverted 60 engine Further streamlining camouflaging engine accomplished fiber glass cowling provide much space around engine possible muffler permit installation battery pack under cowling desired help establish correct CG location resorting- excess dead weight balance common practice remove scalelike engines routine test flights necessary substitute equivalent weight prevent shift CG reason fiberglass cowl engine crankcase formed separate molded parts crankcase form made hard balsa previously used packing crating because its weight balsa cut discs laminated before shaping size During machining observed form tended turn out round lathe due end grain cutting same other grain directions Care taken bring form back round hand work Finally form fitted -in diameter wood-holding dowel centrally located extend axially out back dowel can supported easily vise applying fiber glass No attempt made provide draft taper form diameters since believed fiberglass crank case would have cut form anyway pleasant sur prise easy-does-it method completed fiberglass crankcase removed piece damage either crankcase form method removal follows I Remove thumb tacks held Saran Wrap glass cloth place being coated Hobbypoxy II during placement balloon cover lay-up 2 Trim fiberglass rear outer di ameter assure no fiberglass locks around back corner form rough out front open hole fiber glass cowl removing excess cut away extract thumb tacks operations easier fiber glass has cured two three hours has completely hardened 3 Insert artists flexible palette knife rear form under fiberglass Saran Wrap Japa nese artist paint mixing knife used 92 Model Aviation author 3-in flexible blade tapered thickness 014 inch tip 028 inch handle Also sides knife slightly tapered tip bent upward almost im perceptible amount Slide knife axi ally along surface work 3600 around formthe same way cooks re move cakes layer-cake pans will free fiberglass form Some slight temporary stretching may oc cur Saran Wrap may displaced partially Repeat process until fiberglass crankcase can pulled form author has omitted ba sic details easy-does-it method cause has published Hobby poxy other detailed published articles following comments will assist decision making emphasize certain important details Three layers glass cloth good coatings Hobbypoxy II will make light crankcase five layers glass cloth starting medium weight finishing light weight glass cloth would better Smoother thinner coatings epoxy can applied epoxy kept warm during ap plication means small hair dryer Bubbles can excluded careful ap plication under warm conditions worry about bubblessince mar surface can opened filled later show painted Care should taken prevent roundoff flats crankcase provided mounting engine cylinders can accomplished taping layer foam rubber over deflated balloon press evenly completely around section having flats epoxy hardens use rubber bands re tain foam rubber because will localize pressure too much per manently indent fiberglass Masking tape works well hold foam rubber place engine cowling form made us ing layers scrap plastic foam shaped a sheets laminated front back serve templates prevent distortion rounding front back corners under pressure holding dowel built form After form shaped size author used US Gypsum Top Coat mixed water fill pores plastic foam blend shape form almost dry hard form completely sanded Top Coat easily sanded very rough fully hard ened possible sand easily very slight amount moisture still remains just prior final hardening Top Coat can better job less ex pense compared use filler coating made Tite Bond cement Commercially Top Coat used pre pared wall surfaces cover nail indenta tions joints finish coat can made very smooth Used plastic foam surface strong coating insulates protects plastic foam damage hot air used soften smooth epoxy coating need very thick thinner ap plications preferred reduce number coatings have applied take care shrinkage can occur thick sections Waxing form recommended since Saran Wrap can applied easily shrunk very neatly form After fiberglass work completed flexible palette knife used previously explained help re move cowling damage either cowling form author tried success locally procure balloons large enough easy-does-it method making engine cowling Jumbo-size 16 diameter balloons procured quite big enough cowl ing Therefore usual amount sanding necessary smooth finish word caution attempt ing use easy-does-it method Secure glass cloth well thumb tacks areas cut away prevent shifting due balloon breakage slippage Bal loons little too small may go onto form slip back off again especially back turned doing position loose fiber glass cloth will shifted Following rule thumb balloon least twice big form usually helps prevent trouble sloping shape engine cowling encouraged slippage balloons glance landing gear may tend make potential builder have second thoughts author confesses item did delay start project Happily landing gear came out right first time very little extra effort using four single pieces i/i diam eter piano wire finished product Since landing gear has 12 strut members wire simulates several struts order conserve building time piano wire author played around coat hanger wire develop side gear though calculated angles bends lengths struts paid attention lengths bent wire fit mount ing attach points soft pat tern wires correctly shaped pieces piano wire bent exactly same way Having completed side opposite side gear bent soft wire reversing bends required pieces piano wire bent duplicate side small vise mark ing Kodak negative pencil authors preference pair abrasive cut-off discsmounted arbor chuck Dremel toolwere tools used work piano wire coat hanger wire initially straightened first strut length marked wire allowance bend Having made bend next strut length marked wire al lowance bend process repeated until bends made adjusted meet attach points same procedure used piano wire using soft wire pattern visu al guide During design landing gear noted torsional restraint could utilized strengthen gear rather relying resistance bending alone done use grooved maple landing gear block Top Flite firmly af fixed screws epoxy back bottom edge plywood firewall Also using two other separate pieces short lengths grooved maple blocks tached points provided immediately front leading edge bottom wing front side plywood bulk head number 2 use mounting attach points piano wire started axle bent angle up toward middle firewall mounting block bent lay groove reverse direction exit same side turned up slightly inverted N bent side fuselage bulkhead number 2 Straps screws hold torsional portion groove after wire end plugged side fuselage hard wood separator block shown drawing attached landing gear block prevent shift torsional sections toward middle slipping groove under holding straps second piece wire formed attach rearward cowling near top longeron fuselage bent downward include Oleo strut bent under axle back under lower wing attach near center bottom fuselage rear trailing edge left right upper ends attach through individual Nylon brackets cut single CG Nylon nose-gear bracket bolted back plywood firewall ends held wheel collars rearward ends bent right angles inserted holes drilled 94 Model Aviation SCALE CLASICS Plans & Construction Manual CURTISS HAWK POESTINSON RELIANT BRO V Scale 945 Span S220 V Scale 126 Spat250 2Scale 63 Span S12 2Scale 84Span1500 11tSoale 47VoSpan 1000 l0Soela 63 Span$1260 CURTISS GOSHAWK FIlCO 2 Scale 63 SpanS1S~ CURTISS GULFHAWK lA . 2Soale 63 Span 51600 Scale 94 5pa 63000 Peaee Add 6160 P 040 Foetag sod 0e,dllog. OutSide US Add $300Make alt PSymeete Richard G Barron1213 Holly Spring Ln Grand Blanc MichIgan 48439 Seed Slos Complete toomatlen INSTALL AfidUun FUEL TANK ITS GOOD TO KNOW ITS IN THERE FULL TANK SYSTEM Modelers agree Sullivan has put gether k thats really can now fill tank top bubble allows enough room air tubing fitting neatly inside bubble tanks except smaller 4 oz clude Klapper-Klunk stiff-arm klunk klunk pick-ups se own system NEV-R-LEAK fuel tanks have standard favorite years Made better bubble-top FULL TANK SYSTEM now ll become tanks youll ever want use rectangular piece Epoxy printed cir cuit board attached bottom center area lower wing mounting block notched Nylon strap bolted under through lower wing constrains ends wire holes Epoxy mounting plate Attachment wire looped under axle axle itself matter personal preference author preferring use binding wire sol der made pair aluminum parts Nylon other materials could used instead point counts number bends wires will find number equal little wire gears affix back fire wall due number bends required prevent displacement firewall gear stronger construction others made size wire side tripod struts attaches top Oleo strut Oleo strut together two lower struts likewise forms tripod attaching wheel hub Application dope can expedited using 3-in cubes Polyurethane instead brush Use small aluminum pan margarine container hold dope Soak about dope side cube apply covering slight pressure will feed dope side pores cube reducing drag stroke However first coat silk cube should held off instant encourage slight dryness lightly touched silk ap ply too much dope cause runs Since weight especially tail has detri mental effect flying quality apply minimum amount dopein particular heavier color dope Experience indicated 20 right 20 down thrust would good first ap proximation angles needed straight level flight Offsets base engine mount about 5/32 inch can used bring propeller shaft center cowling better appear ance however should borne mind also offsets engine thrust line will decrease thrust correction angles required angles offsets desired together 20 positive set ting stabilizer should set first test flight Under conditions takeoff flight should accomplished less panic greater safety Hope fully trim adjustments will within limits trim available transmitter Any thought engine mount could machined thrust correction discarded found 148 inch would have removed measured point edge slanted 450 axis vertical 3-in diameter engine mount base Therefore large wedgeshaped aluminum shim form annulus ring washer made drilled provide mounting holes required engine mount installation Fig provides scientific accurate way determining specs making such aluminum wedge suggested 3/16 thick alumi num sheet stock used machining circular wedge shim Machine shim scribe position axis drill mounting holes type shim will produce firmest engine mount support Wing strut landing gear strut angles lengths can calculated similarly using compound angle formulas Simplest way visualize problem draw pyramid corner edge perpen dicular arectangular base longest edge representing strut question perpendicular distance tween attach points bends coordinates base can obtained original drawings accordance scale Projected angles can measured directly drawings unaffected scale Formulas type calculation listed Mechanics Vest Pocket Reference Book full explanation compound angles contained Practical Shop Mathemat ics Vol No 2 J H Wolfe E R Phelps McGraw-Hill After having prepared description good method use applying dope especially silk winter arrived odor dope would have offen sive Coverite applied word February 1 979 95 A Enough space air bubble B Fill tank top C Tube goes up air bubble 12-INCH LENGTH OFSULLI-CONETUBING FREE WITH EVERYTANK ATYPICAL ELEVAT/RuOOER INSlALLATION -xxxx 7G&PLIiIIiNGE COONEY * EASY INSTALLATION * NO AR GAP * FREE MOVEMENT * STRONG AND LIGHTWEIGHT MPLETELY FUELPROOF * COMPATIBLE WITH ALL IRON-ON COVERINGS FOURMOST RACING PRODU CTS 24th Avenue caution black color Coverite used tended bleed yellow Cover ite insignia trim Glaskote later used seal lettering would have prevented color bleeding painted contact surface prior trimming final installation assembly methods devised retaining fuel tank installing muffler providing good looking landing light lens First found square 12ounce Sullivan fuel tank fits nicely quart size cardboard milk carton simple matter cut position hold container place bulkhead #2 flat pieces apple taffy sticks important make installation removable access servos Another good way make engine bulkhead removable firewall complete engine fuel tank Secondly Slim Line Muffler fine engine installation should modified install right angles Beside looking much better muffler can re main engine during assembly removal cowling Viewed side modified muffler appears position imitates air inlet dummy engine Thirdly very realistic looking lens landing lights can made about five minutes Simply acquire pair plastic egg containers wife girl friend has purchased two pair Leggs panty hose Use largest end egg scribe required diameter circle inside spinning small compass Using pair scissors cut crack ing inscribed circle Attach lenses landing lights Pliobond cement record landing lights black dress up piano wire landing gear decided use large size straight plastic soda straws Short pieces black neoprene tubing Sullivan split snapped around wire concentrically space ends split plastic soda straws conceal split straws two concentric straws used splits oriented 1800 apart wire outside split can covered TYPICAL AILERO*J1NSTA L-A ON xX-x 35 length invisible Scotch tape fore after painting Likewise ends can retained wrap same tape Tests proved tape could doped fact dope will stay tape little loss gloss whereas dope may tend flake off smooth plastic straws flexed Sanding straws lightly roughen surface helps flight straws fly off Since Olco struts larger decided use cut off plastic barrel sec tions black felt pens sections pens split lengthwise means Xacto saw snapped over piano wire Concentric spacing accomplished build-up split neoprene tubing Axial shift pieces pens prevented Goo cement rubber like modelers cement author also applies prevent wheel colars com ing off etc preparation flying landing lights scale engine cowl re moved pair 3-in diameter wheels 13-5 propeller installed model balanced 12 ounces lead two 6 ounce sinkers engine mount moved CG forward about 30% location general everything done compen sate unwanted torque effects assure model would fly tail heavy Now happiest reward ing part test flights prototype Frank Stanton friend fellow club member agreed serve test pilot club field Johnsville NADC Warminster PA first check flight complete success Indications less ballast could have used trim adjustments required 50% left rudder trim 100% up elevator trim means transmitter trim ad justments airplane flew well trim changes surfaces second flight became stunt flight Would believe Frank flew large portion rolling circle Barring low sun position Frank probably would have gone way around Allowing fact model being flown very capable flier observers noted excellent manner Pitcairn Mailwing responded flight After test flights Franks comments Its good flying airplane Its piece cake fly next flying session Pitcairn Mailwing flown dressed-up inflight pictures time ballast weight reduced about 8 ounces Two flights flown shoot takeoff fly-by landing pictures surpris ing model did roll fast cause ailerons lower wing no differential utilized Aileron turns good turns made using rudder resulted loss al titude unusual Indications smooth grass fly ing fields would preferable hard sur face runways agreement ground handling original airplane flown landing lights scale engine cowl configuration tends protect damage should ground loop occur propeller sur vived two ground loops hard runways final note author has recently purchased Giant Round Balloons made Mexico distributed through World Toy House balloons look very promising use making large en gine cowls easy-does-it method course modelers should overlook possibility obtaining suitable balloons Hobbypoxy people origi nated method RC Aerobatics/Van Putte continued page 28 does guarantee Novice pattern tro phy enough good fliers around have make very difficult great flier win sport airplane several ways proceed al leviating situation have pitfalls will probably take grass roots movement have much effect pattern flying since major changes rules very infrequent unless widespread demonstration need desire change Contest Di rectors will have make decisions offer competition line proposed rule changes see work out National Society Radio Controlled Aerobatics NS RCA can strong fac tor proposed rule changes NSRCA district vice presidents should given feedback proposed changes issues can aired K Factor monthly newsletter NSRCA arent already NSRCA member send $10 1979 dues Mrs Sally Brown Secretary Treasurer 8534 Huddleston Drive Cincinnati OH 45236 thing has tried Con test Directors contests around coun try has introduction special Novice class beginners pattern com petition large contests have 96 Model Aviation LARGESMALL fit saafoces 1/8 thicker
Edition: Model Aviation - 1979/02
Page Numbers: 16, 17, 18, 19, 20, 21, 22, 23, 92, 94, 95, 96
NO OCR TEXT 4 have re will pose maximum ced 45 pounds p ai ed Ltuyin ce md 35 air time Cha I/16X ALL RIBS L F RC NO OCR TEXT LONOING LIGHTCGT-OLIT 2 REQUIRED lODE WING PLUS FOR POSITION REDUCE ROROER TO FLAT OURFACE I/WIG OR PLYWOOD INSERT OIOL MODIDTEO LANDING REAR SUPPORT BRACKET 0 REGOELEVATORDRONE SERVO MATE FROM NYLON NOSE WHEEL MOUNTINGERVSTIPS-lO SHOWN THROTTLE POSH ROD CA THROST OFFSET LI L 403 RDRGLSA7fl FORMER N 1 4Sg O~lL ERAFYHECI ~1 1 V ROSOER IV SERVO II ID INCH IIIII BELLCRANE KiL4Lii- Th---- hR SHEET WULSA TEMPORARY MOLDING RHUCE FORMER 3 IN 3G Ill I I I/ID SHEET HARDWOOD LANDING GEARI HOLWITING RLOCIS NOTE MOUNT ENLUNE 8TH ST DOWN THRUST DM0 ST RIGHT THRUST SIDE VIEW ODES NOT GROW ANT DOWN THRUST CANT FRONT OF TGWLWG TO AGREE WITH ANGLES SF TRRSSY OFFSET NOTE OGRE LONER PORTION SF FORMERS-S4 U T 8 FROM I/RD I/O DOLOR INST 511/WE OR TEMPLATESTG /8 BALSA FORMER 7OR SHEETFORMER S3132530R BALSA RALOG 3/3251/4 BALSA UTTUER OGRARE STRUTS ST FGSELAGE OSING HARDFORMERS WOOD SPACERD 0415 FRONTFORMER-U C 3/KIN HEGH___________G ALOD HEADREST /30 PLYWOUDWINDSHIELD COWLING I/lU PLYWOOD WING SADOL SPLIT IWOPREIWIGOERYG 2 EACH SIDE IGOFT FOAMREADTURING EGO/HO I]-iPOOHEDGING REMO5E RGLSUIIERHFT INSERT VWRL-Y -DECI WOOD POW I -- I/IN WALGA- ARA5STRUTG -I- L VEPRESENTATISE CYLINDERSGRFACE TO SGRFUCE___________ CRUNREADE IN LOWLINS FORUS CALCULATED___________ BRADY WHIRLWIND 15RUTTERY BOG SCALE ENGINE YfFIAIYD,STS/REII SCALE PROPELLER SIZE- lAO/H DIG/ HP Al FRE ENGINE GROWN 2ROLES FOR 3/KIND3/RG3/R TRIUNGULUR WING MOUNTING DOWELS3/H D3/R MUPLEDALSA INDIDE WING MOGNYING CROSS MEMHERI/IN EPOXY PC ROGRO I-OR LONG CALCULATEDG1I-I/U WIDE DRILL 2 HOLES hR GIG CS1/4 D3/RGI/ID NYLDN MLOCD3/H E TO G POD LANDING DEAR NOTCH I/W DEEP WITH S/H GIRDING DALL AT CENTER FOR RHDEREK K 2j 4 EDIA25/30 HER THICKNESSICC NOTE IWSDE MEGODREMENTT-GRTO DUD II /R#35 OIHLL 030 NOTE 2 STERPLANE WING STRUTS CALCULATED RR2 ISSURFACE TO OSREUCE DYRAL 3/H WIDE TEE ATTUCH POINTS OR WINGS / -S/FOR MER-2 I/A PLYWOOD 04 ALAATTERY DOD 0 OGGO 5/HG VH RADIO SHAdS MINI ROGMSDIFIEO SR DELLERUNK OH AL U CHANNEL I/A WIDE MADE FROM MINFROG SCRAP AL GOD 3/H MAPLE GEFOET SPACER H VA AL S/IN WIDE LENOTH TOSGIT REODIRED CONTROL HORDE BOLT SIDE BY SIDE TO HELLERORN GRILL POR DOD JACK SHAFT SPREE WITH REVLON TURES TOP NOTE WIRE NO3 OGII34ZIGLO FRUTAT SlEW 4/HOV SAYLOR CLEFIG STRUT FITTINGTHRI/ST ASIS ID REQUIRED N 0 0 5 IEM GSLE-i4,MOTTOM OR S PIANO WIRE -I I/A PlYWOOD FACRO SPUD SIGESOHI F BRACE 1 ANGLE EACH END LANDIBO ACAR BOLT FRILL S/IA U FR RAROWOOS INSERTWERBNR B-US SIDE P1501 NERDE FR I/S SALT RUSSIAROFRA FOR STRUT MB-B LOWER WINS BOLTALERIS1 PUSH ROE ALE LOCATIONS/ / IIII 3/ASIA RAROWOOG UTWELS MARE TAO UPPROS 2 IN ION 2/A NULGA SHAPE TO AIRFOIL II~ii /II LOWER WING 3/BUS/B BALSA UPPER WINO test hop builwntnrustl e fuselage blackin quart iling npound angle andMuseum utas derived DC o axis y 9 degrnon Airport Virginia West urn M engine mourn Ige new axis Y tan B e ie cc FIRE example using ved formulas nc Tables thrust C4 e ptnuary 1959 Amer II 1960 Air ing o ar bracinp lower br ously Pu ueI th nt model like mi Chief E ailerons ne lower ng UI isnodels t moving downwar neutral aft th move OSI1I ood way c d yaw Sta Openers/Winter continued page 4 cloaks clock-watchers see some hearts can saddened Like TVs Dangerfield dont get no respect see irony power center AMA Washington Un der by-laws membership elects district vice presidents also Council members Almost far away states caliber people testifies judgment members elected themthey capable As group meet four times year deal best abil ities matters before qualifications businessmen pri vate life impeccable dont defend perfect expected anyone human being perhaps feel no defense FO needed welcome Perhaps make mistakes cannot say Perhaps timing things always brilliant devious calculating po lit icalthey modelers serving volun tarily know believe what decide motivated what feel best Sometimes means Executive Director minority Council meeting happens right Council charge no governmental agency-type Secre tary Washington can Big Brother us what FO about say could receive pink slip simply Recent actions have taken place done some us may drop wayside awhile will go growing Council hear message members call out proceed caution lay out new programs added expenses things members think AMA should Most members above dues increase less cost next weeks fuel buy other magazine almost much AMA asks magazine insurance other benefits others among us ask Should go response few people have ad dressed editor let us keep cool Dues increases however necessary brew negative reactionsnobody willingly ac cepts higher prices cant let ex perts confuse us individual mem bers can make own assessments finally patient readers may say Fine youAMA pays salary answer simply should hope can well other ways like old warhorse FO likes sniff battlefield challenge improve magazine see firmly its way mem bership tool par excellance help AMA grow prosper right know way words used discussion parody Supreme Court deci sions meaning Should everyones cor respondence AMA headquarters plastered billboard present instance publications demand AMA print letter critique logically based upon imagined need shed light some secretive wrong doing AMA has asked account pa per clips sugar cubes etc broken down AMA use Model Aviation use true joke think Watergate Deep Throat Will Judge Jaworski appear doorway Enough already Speaking rights almost 50000 people wanted paid Model Aviation 1978 have Can two critics seriously think people great majority Open mem bers can denied what prefer troubled FO offers words late President Jack Kennedy great enemy truth very ten liedeliberate contrived dishonest mythpersistent persuasive unrealistic Too often hold fast cliches fore-bear ers subject facts prefabricat ed set interpretations enjoy comfort opinion discom fort thought Greatest Show/Howard continued page 13 tions booth several years draws lots interest spec tators AMA represented president Johnny Clemens Larry Bolich special events director Earl Witt secretary-treasurer AMA always very responsive type public exposure could go on about fun fellowship fliers enjoy show photos show much words can tell can see Flying Circus future make plans participate Enjoy hobby Pitcairn/Stott continued page 23 per wing span would have 66 inches An increase over 4 inches upper wing span would have made assembled model airplane too large placed back seat automobile scale model designer builder must decide detailed scale model should decision involves consideration available material time money shop equipment desired usage ability Now Sport Scale Stand-Off Scale gaining popular ity over true scale choice has broadened authors decisions largely compromise based desire fun fly moderately windy weather possibly enter contest requiring exact scale Although model deviates scale selection airfoil slightly larger engine scale plans show true outline except previously noted realistic appearance slightly over-size 2 inch ot Williams Wright Whirlwind J5 installed way largely conceal inverted 60 engine Further streamlining camouflaging engine accomplished fiber glass cowling provide much space around engine possible muffler permit installation battery pack under cowling desired help establish correct CG location resorting- excess dead weight balance common practice remove scalelike engines routine test flights necessary substitute equivalent weight prevent shift CG reason fiberglass cowl engine crankcase formed separate molded parts crankcase form made hard balsa previously used packing crating because its weight balsa cut discs laminated before shaping size During machining observed form tended turn out round lathe due end grain cutting same other grain directions Care taken bring form back round hand work Finally form fitted -in diameter wood-holding dowel centrally located extend axially out back dowel can supported easily vise applying fiber glass No attempt made provide draft taper form diameters since believed fiberglass crank case would have cut form anyway pleasant sur prise easy-does-it method completed fiberglass crankcase removed piece damage either crankcase form method removal follows I Remove thumb tacks held Saran Wrap glass cloth place being coated Hobbypoxy II during placement balloon cover lay-up 2 Trim fiberglass rear outer di ameter assure no fiberglass locks around back corner form rough out front open hole fiber glass cowl removing excess cut away extract thumb tacks operations easier fiber glass has cured two three hours has completely hardened 3 Insert artists flexible palette knife rear form under fiberglass Saran Wrap Japa nese artist paint mixing knife used 92 Model Aviation author 3-in flexible blade tapered thickness 014 inch tip 028 inch handle Also sides knife slightly tapered tip bent upward almost im perceptible amount Slide knife axi ally along surface work 3600 around formthe same way cooks re move cakes layer-cake pans will free fiberglass form Some slight temporary stretching may oc cur Saran Wrap may displaced partially Repeat process until fiberglass crankcase can pulled form author has omitted ba sic details easy-does-it method cause has published Hobby poxy other detailed published articles following comments will assist decision making emphasize certain important details Three layers glass cloth good coatings Hobbypoxy II will make light crankcase five layers glass cloth starting medium weight finishing light weight glass cloth would better Smoother thinner coatings epoxy can applied epoxy kept warm during ap plication means small hair dryer Bubbles can excluded careful ap plication under warm conditions worry about bubblessince mar surface can opened filled later show painted Care should taken prevent roundoff flats crankcase provided mounting engine cylinders can accomplished taping layer foam rubber over deflated balloon press evenly completely around section having flats epoxy hardens use rubber bands re tain foam rubber because will localize pressure too much per manently indent fiberglass Masking tape works well hold foam rubber place engine cowling form made us ing layers scrap plastic foam shaped a sheets laminated front back serve templates prevent distortion rounding front back corners under pressure holding dowel built form After form shaped size author used US Gypsum Top Coat mixed water fill pores plastic foam blend shape form almost dry hard form completely sanded Top Coat easily sanded very rough fully hard ened possible sand easily very slight amount moisture still remains just prior final hardening Top Coat can better job less ex pense compared use filler coating made Tite Bond cement Commercially Top Coat used pre pared wall surfaces cover nail indenta tions joints finish coat can made very smooth Used plastic foam surface strong coating insulates protects plastic foam damage hot air used soften smooth epoxy coating need very thick thinner ap plications preferred reduce number coatings have applied take care shrinkage can occur thick sections Waxing form recommended since Saran Wrap can applied easily shrunk very neatly form After fiberglass work completed flexible palette knife used previously explained help re move cowling damage either cowling form author tried success locally procure balloons large enough easy-does-it method making engine cowling Jumbo-size 16 diameter balloons procured quite big enough cowl ing Therefore usual amount sanding necessary smooth finish word caution attempt ing use easy-does-it method Secure glass cloth well thumb tacks areas cut away prevent shifting due balloon breakage slippage Bal loons little too small may go onto form slip back off again especially back turned doing position loose fiber glass cloth will shifted Following rule thumb balloon least twice big form usually helps prevent trouble sloping shape engine cowling encouraged slippage balloons glance landing gear may tend make potential builder have second thoughts author confesses item did delay start project Happily landing gear came out right first time very little extra effort using four single pieces i/i diam eter piano wire finished product Since landing gear has 12 strut members wire simulates several struts order conserve building time piano wire author played around coat hanger wire develop side gear though calculated angles bends lengths struts paid attention lengths bent wire fit mount ing attach points soft pat tern wires correctly shaped pieces piano wire bent exactly same way Having completed side opposite side gear bent soft wire reversing bends required pieces piano wire bent duplicate side small vise mark ing Kodak negative pencil authors preference pair abrasive cut-off discsmounted arbor chuck Dremel toolwere tools used work piano wire coat hanger wire initially straightened first strut length marked wire allowance bend Having made bend next strut length marked wire al lowance bend process repeated until bends made adjusted meet attach points same procedure used piano wire using soft wire pattern visu al guide During design landing gear noted torsional restraint could utilized strengthen gear rather relying resistance bending alone done use grooved maple landing gear block Top Flite firmly af fixed screws epoxy back bottom edge plywood firewall Also using two other separate pieces short lengths grooved maple blocks tached points provided immediately front leading edge bottom wing front side plywood bulk head number 2 use mounting attach points piano wire started axle bent angle up toward middle firewall mounting block bent lay groove reverse direction exit same side turned up slightly inverted N bent side fuselage bulkhead number 2 Straps screws hold torsional portion groove after wire end plugged side fuselage hard wood separator block shown drawing attached landing gear block prevent shift torsional sections toward middle slipping groove under holding straps second piece wire formed attach rearward cowling near top longeron fuselage bent downward include Oleo strut bent under axle back under lower wing attach near center bottom fuselage rear trailing edge left right upper ends attach through individual Nylon brackets cut single CG Nylon nose-gear bracket bolted back plywood firewall ends held wheel collars rearward ends bent right angles inserted holes drilled 94 Model Aviation SCALE CLASICS Plans & Construction Manual CURTISS HAWK POESTINSON RELIANT BRO V Scale 945 Span S220 V Scale 126 Spat250 2Scale 63 Span S12 2Scale 84Span1500 11tSoale 47VoSpan 1000 l0Soela 63 Span$1260 CURTISS GOSHAWK FIlCO 2 Scale 63 SpanS1S~ CURTISS GULFHAWK lA . 2Soale 63 Span 51600 Scale 94 5pa 63000 Peaee Add 6160 P 040 Foetag sod 0e,dllog. OutSide US Add $300Make alt PSymeete Richard G Barron1213 Holly Spring Ln Grand Blanc MichIgan 48439 Seed Slos Complete toomatlen INSTALL AfidUun FUEL TANK ITS GOOD TO KNOW ITS IN THERE FULL TANK SYSTEM Modelers agree Sullivan has put gether k thats really can now fill tank top bubble allows enough room air tubing fitting neatly inside bubble tanks except smaller 4 oz clude Klapper-Klunk stiff-arm klunk klunk pick-ups se own system NEV-R-LEAK fuel tanks have standard favorite years Made better bubble-top FULL TANK SYSTEM now ll become tanks youll ever want use rectangular piece Epoxy printed cir cuit board attached bottom center area lower wing mounting block notched Nylon strap bolted under through lower wing constrains ends wire holes Epoxy mounting plate Attachment wire looped under axle axle itself matter personal preference author preferring use binding wire sol der made pair aluminum parts Nylon other materials could used instead point counts number bends wires will find number equal little wire gears affix back fire wall due number bends required prevent displacement firewall gear stronger construction others made size wire side tripod struts attaches top Oleo strut Oleo strut together two lower struts likewise forms tripod attaching wheel hub Application dope can expedited using 3-in cubes Polyurethane instead brush Use small aluminum pan margarine container hold dope Soak about dope side cube apply covering slight pressure will feed dope side pores cube reducing drag stroke However first coat silk cube should held off instant encourage slight dryness lightly touched silk ap ply too much dope cause runs Since weight especially tail has detri mental effect flying quality apply minimum amount dopein particular heavier color dope Experience indicated 20 right 20 down thrust would good first ap proximation angles needed straight level flight Offsets base engine mount about 5/32 inch can used bring propeller shaft center cowling better appear ance however should borne mind also offsets engine thrust line will decrease thrust correction angles required angles offsets desired together 20 positive set ting stabilizer should set first test flight Under conditions takeoff flight should accomplished less panic greater safety Hope fully trim adjustments will within limits trim available transmitter Any thought engine mount could machined thrust correction discarded found 148 inch would have removed measured point edge slanted 450 axis vertical 3-in diameter engine mount base Therefore large wedgeshaped aluminum shim form annulus ring washer made drilled provide mounting holes required engine mount installation Fig provides scientific accurate way determining specs making such aluminum wedge suggested 3/16 thick alumi num sheet stock used machining circular wedge shim Machine shim scribe position axis drill mounting holes type shim will produce firmest engine mount support Wing strut landing gear strut angles lengths can calculated similarly using compound angle formulas Simplest way visualize problem draw pyramid corner edge perpen dicular arectangular base longest edge representing strut question perpendicular distance tween attach points bends coordinates base can obtained original drawings accordance scale Projected angles can measured directly drawings unaffected scale Formulas type calculation listed Mechanics Vest Pocket Reference Book full explanation compound angles contained Practical Shop Mathemat ics Vol No 2 J H Wolfe E R Phelps McGraw-Hill After having prepared description good method use applying dope especially silk winter arrived odor dope would have offen sive Coverite applied word February 1 979 95 A Enough space air bubble B Fill tank top C Tube goes up air bubble 12-INCH LENGTH OFSULLI-CONETUBING FREE WITH EVERYTANK ATYPICAL ELEVAT/RuOOER INSlALLATION -xxxx 7G&PLIiIIiNGE COONEY * EASY INSTALLATION * NO AR GAP * FREE MOVEMENT * STRONG AND LIGHTWEIGHT MPLETELY FUELPROOF * COMPATIBLE WITH ALL IRON-ON COVERINGS FOURMOST RACING PRODU CTS 24th Avenue caution black color Coverite used tended bleed yellow Cover ite insignia trim Glaskote later used seal lettering would have prevented color bleeding painted contact surface prior trimming final installation assembly methods devised retaining fuel tank installing muffler providing good looking landing light lens First found square 12ounce Sullivan fuel tank fits nicely quart size cardboard milk carton simple matter cut position hold container place bulkhead #2 flat pieces apple taffy sticks important make installation removable access servos Another good way make engine bulkhead removable firewall complete engine fuel tank Secondly Slim Line Muffler fine engine installation should modified install right angles Beside looking much better muffler can re main engine during assembly removal cowling Viewed side modified muffler appears position imitates air inlet dummy engine Thirdly very realistic looking lens landing lights can made about five minutes Simply acquire pair plastic egg containers wife girl friend has purchased two pair Leggs panty hose Use largest end egg scribe required diameter circle inside spinning small compass Using pair scissors cut crack ing inscribed circle Attach lenses landing lights Pliobond cement record landing lights black dress up piano wire landing gear decided use large size straight plastic soda straws Short pieces black neoprene tubing Sullivan split snapped around wire concentrically space ends split plastic soda straws conceal split straws two concentric straws used splits oriented 1800 apart wire outside split can covered TYPICAL AILERO*J1NSTA L-A ON xX-x 35 length invisible Scotch tape fore after painting Likewise ends can retained wrap same tape Tests proved tape could doped fact dope will stay tape little loss gloss whereas dope may tend flake off smooth plastic straws flexed Sanding straws lightly roughen surface helps flight straws fly off Since Olco struts larger decided use cut off plastic barrel sec tions black felt pens sections pens split lengthwise means Xacto saw snapped over piano wire Concentric spacing accomplished build-up split neoprene tubing Axial shift pieces pens prevented Goo cement rubber like modelers cement author also applies prevent wheel colars com ing off etc preparation flying landing lights scale engine cowl re moved pair 3-in diameter wheels 13-5 propeller installed model balanced 12 ounces lead two 6 ounce sinkers engine mount moved CG forward about 30% location general everything done compen sate unwanted torque effects assure model would fly tail heavy Now happiest reward ing part test flights prototype Frank Stanton friend fellow club member agreed serve test pilot club field Johnsville NADC Warminster PA first check flight complete success Indications less ballast could have used trim adjustments required 50% left rudder trim 100% up elevator trim means transmitter trim ad justments airplane flew well trim changes surfaces second flight became stunt flight Would believe Frank flew large portion rolling circle Barring low sun position Frank probably would have gone way around Allowing fact model being flown very capable flier observers noted excellent manner Pitcairn Mailwing responded flight After test flights Franks comments Its good flying airplane Its piece cake fly next flying session Pitcairn Mailwing flown dressed-up inflight pictures time ballast weight reduced about 8 ounces Two flights flown shoot takeoff fly-by landing pictures surpris ing model did roll fast cause ailerons lower wing no differential utilized Aileron turns good turns made using rudder resulted loss al titude unusual Indications smooth grass fly ing fields would preferable hard sur face runways agreement ground handling original airplane flown landing lights scale engine cowl configuration tends protect damage should ground loop occur propeller sur vived two ground loops hard runways final note author has recently purchased Giant Round Balloons made Mexico distributed through World Toy House balloons look very promising use making large en gine cowls easy-does-it method course modelers should overlook possibility obtaining suitable balloons Hobbypoxy people origi nated method RC Aerobatics/Van Putte continued page 28 does guarantee Novice pattern tro phy enough good fliers around have make very difficult great flier win sport airplane several ways proceed al leviating situation have pitfalls will probably take grass roots movement have much effect pattern flying since major changes rules very infrequent unless widespread demonstration need desire change Contest Di rectors will have make decisions offer competition line proposed rule changes see work out National Society Radio Controlled Aerobatics NS RCA can strong fac tor proposed rule changes NSRCA district vice presidents should given feedback proposed changes issues can aired K Factor monthly newsletter NSRCA arent already NSRCA member send $10 1979 dues Mrs Sally Brown Secretary Treasurer 8534 Huddleston Drive Cincinnati OH 45236 thing has tried Con test Directors contests around coun try has introduction special Novice class beginners pattern com petition large contests have 96 Model Aviation LARGESMALL fit saafoces 1/8 thicker
Edition: Model Aviation - 1979/02
Page Numbers: 16, 17, 18, 19, 20, 21, 22, 23, 92, 94, 95, 96
NO OCR TEXT 4 have re will pose maximum ced 45 pounds p ai ed Ltuyin ce md 35 air time Cha I/16X ALL RIBS L F RC NO OCR TEXT LONOING LIGHTCGT-OLIT 2 REQUIRED lODE WING PLUS FOR POSITION REDUCE ROROER TO FLAT OURFACE I/WIG OR PLYWOOD INSERT OIOL MODIDTEO LANDING REAR SUPPORT BRACKET 0 REGOELEVATORDRONE SERVO MATE FROM NYLON NOSE WHEEL MOUNTINGERVSTIPS-lO SHOWN THROTTLE POSH ROD CA THROST OFFSET LI L 403 RDRGLSA7fl FORMER N 1 4Sg O~lL ERAFYHECI ~1 1 V ROSOER IV SERVO II ID INCH IIIII BELLCRANE KiL4Lii- Th---- hR SHEET WULSA TEMPORARY MOLDING RHUCE FORMER 3 IN 3G Ill I I I/ID SHEET HARDWOOD LANDING GEARI HOLWITING RLOCIS NOTE MOUNT ENLUNE 8TH ST DOWN THRUST DM0 ST RIGHT THRUST SIDE VIEW ODES NOT GROW ANT DOWN THRUST CANT FRONT OF TGWLWG TO AGREE WITH ANGLES SF TRRSSY OFFSET NOTE OGRE LONER PORTION SF FORMERS-S4 U T 8 FROM I/RD I/O DOLOR INST 511/WE OR TEMPLATESTG /8 BALSA FORMER 7OR SHEETFORMER S3132530R BALSA RALOG 3/3251/4 BALSA UTTUER OGRARE STRUTS ST FGSELAGE OSING HARDFORMERS WOOD SPACERD 0415 FRONTFORMER-U C 3/KIN HEGH___________G ALOD HEADREST /30 PLYWOUDWINDSHIELD COWLING I/lU PLYWOOD WING SADOL SPLIT IWOPREIWIGOERYG 2 EACH SIDE IGOFT FOAMREADTURING EGO/HO I]-iPOOHEDGING REMO5E RGLSUIIERHFT INSERT VWRL-Y -DECI WOOD POW I -- I/IN WALGA- ARA5STRUTG -I- L VEPRESENTATISE CYLINDERSGRFACE TO SGRFUCE___________ CRUNREADE IN LOWLINS FORUS CALCULATED___________ BRADY WHIRLWIND 15RUTTERY BOG SCALE ENGINE YfFIAIYD,STS/REII SCALE PROPELLER SIZE- lAO/H DIG/ HP Al FRE ENGINE GROWN 2ROLES FOR 3/KIND3/RG3/R TRIUNGULUR WING MOUNTING DOWELS3/H D3/R MUPLEDALSA INDIDE WING MOGNYING CROSS MEMHERI/IN EPOXY PC ROGRO I-OR LONG CALCULATEDG1I-I/U WIDE DRILL 2 HOLES hR GIG CS1/4 D3/RGI/ID NYLDN MLOCD3/H E TO G POD LANDING DEAR NOTCH I/W DEEP WITH S/H GIRDING DALL AT CENTER FOR RHDEREK K 2j 4 EDIA25/30 HER THICKNESSICC NOTE IWSDE MEGODREMENTT-GRTO DUD II /R#35 OIHLL 030 NOTE 2 STERPLANE WING STRUTS CALCULATED RR2 ISSURFACE TO OSREUCE DYRAL 3/H WIDE TEE ATTUCH POINTS OR WINGS / -S/FOR MER-2 I/A PLYWOOD 04 ALAATTERY DOD 0 OGGO 5/HG VH RADIO SHAdS MINI ROGMSDIFIEO SR DELLERUNK OH AL U CHANNEL I/A WIDE MADE FROM MINFROG SCRAP AL GOD 3/H MAPLE GEFOET SPACER H VA AL S/IN WIDE LENOTH TOSGIT REODIRED CONTROL HORDE BOLT SIDE BY SIDE TO HELLERORN GRILL POR DOD JACK SHAFT SPREE WITH REVLON TURES TOP NOTE WIRE NO3 OGII34ZIGLO FRUTAT SlEW 4/HOV SAYLOR CLEFIG STRUT FITTINGTHRI/ST ASIS ID REQUIRED N 0 0 5 IEM GSLE-i4,MOTTOM OR S PIANO WIRE -I I/A PlYWOOD FACRO SPUD SIGESOHI F BRACE 1 ANGLE EACH END LANDIBO ACAR BOLT FRILL S/IA U FR RAROWOOS INSERTWERBNR B-US SIDE P1501 NERDE FR I/S SALT RUSSIAROFRA FOR STRUT MB-B LOWER WINS BOLTALERIS1 PUSH ROE ALE LOCATIONS/ / IIII 3/ASIA RAROWOOG UTWELS MARE TAO UPPROS 2 IN ION 2/A NULGA SHAPE TO AIRFOIL II~ii /II LOWER WING 3/BUS/B BALSA UPPER WINO test hop builwntnrustl e fuselage blackin quart iling npound angle andMuseum utas derived DC o axis y 9 degrnon Airport Virginia West urn M engine mourn Ige new axis Y tan B e ie cc FIRE example using ved formulas nc Tables thrust C4 e ptnuary 1959 Amer II 1960 Air ing o ar bracinp lower br ously Pu ueI th nt model like mi Chief E ailerons ne lower ng UI isnodels t moving downwar neutral aft th move OSI1I ood way c d yaw Sta Openers/Winter continued page 4 cloaks clock-watchers see some hearts can saddened Like TVs Dangerfield dont get no respect see irony power center AMA Washington Un der by-laws membership elects district vice presidents also Council members Almost far away states caliber people testifies judgment members elected themthey capable As group meet four times year deal best abil ities matters before qualifications businessmen pri vate life impeccable dont defend perfect expected anyone human being perhaps feel no defense FO needed welcome Perhaps make mistakes cannot say Perhaps timing things always brilliant devious calculating po lit icalthey modelers serving volun tarily know believe what decide motivated what feel best Sometimes means Executive Director minority Council meeting happens right Council charge no governmental agency-type Secre tary Washington can Big Brother us what FO about say could receive pink slip simply Recent actions have taken place done some us may drop wayside awhile will go growing Council hear message members call out proceed caution lay out new programs added expenses things members think AMA should Most members above dues increase less cost next weeks fuel buy other magazine almost much AMA asks magazine insurance other benefits others among us ask Should go response few people have ad dressed editor let us keep cool Dues increases however necessary brew negative reactionsnobody willingly ac cepts higher prices cant let ex perts confuse us individual mem bers can make own assessments finally patient readers may say Fine youAMA pays salary answer simply should hope can well other ways like old warhorse FO likes sniff battlefield challenge improve magazine see firmly its way mem bership tool par excellance help AMA grow prosper right know way words used discussion parody Supreme Court deci sions meaning Should everyones cor respondence AMA headquarters plastered billboard present instance publications demand AMA print letter critique logically based upon imagined need shed light some secretive wrong doing AMA has asked account pa per clips sugar cubes etc broken down AMA use Model Aviation use true joke think Watergate Deep Throat Will Judge Jaworski appear doorway Enough already Speaking rights almost 50000 people wanted paid Model Aviation 1978 have Can two critics seriously think people great majority Open mem bers can denied what prefer troubled FO offers words late President Jack Kennedy great enemy truth very ten liedeliberate contrived dishonest mythpersistent persuasive unrealistic Too often hold fast cliches fore-bear ers subject facts prefabricat ed set interpretations enjoy comfort opinion discom fort thought Greatest Show/Howard continued page 13 tions booth several years draws lots interest spec tators AMA represented president Johnny Clemens Larry Bolich special events director Earl Witt secretary-treasurer AMA always very responsive type public exposure could go on about fun fellowship fliers enjoy show photos show much words can tell can see Flying Circus future make plans participate Enjoy hobby Pitcairn/Stott continued page 23 per wing span would have 66 inches An increase over 4 inches upper wing span would have made assembled model airplane too large placed back seat automobile scale model designer builder must decide detailed scale model should decision involves consideration available material time money shop equipment desired usage ability Now Sport Scale Stand-Off Scale gaining popular ity over true scale choice has broadened authors decisions largely compromise based desire fun fly moderately windy weather possibly enter contest requiring exact scale Although model deviates scale selection airfoil slightly larger engine scale plans show true outline except previously noted realistic appearance slightly over-size 2 inch ot Williams Wright Whirlwind J5 installed way largely conceal inverted 60 engine Further streamlining camouflaging engine accomplished fiber glass cowling provide much space around engine possible muffler permit installation battery pack under cowling desired help establish correct CG location resorting- excess dead weight balance common practice remove scalelike engines routine test flights necessary substitute equivalent weight prevent shift CG reason fiberglass cowl engine crankcase formed separate molded parts crankcase form made hard balsa previously used packing crating because its weight balsa cut discs laminated before shaping size During machining observed form tended turn out round lathe due end grain cutting same other grain directions Care taken bring form back round hand work Finally form fitted -in diameter wood-holding dowel centrally located extend axially out back dowel can supported easily vise applying fiber glass No attempt made provide draft taper form diameters since believed fiberglass crank case would have cut form anyway pleasant sur prise easy-does-it method completed fiberglass crankcase removed piece damage either crankcase form method removal follows I Remove thumb tacks held Saran Wrap glass cloth place being coated Hobbypoxy II during placement balloon cover lay-up 2 Trim fiberglass rear outer di ameter assure no fiberglass locks around back corner form rough out front open hole fiber glass cowl removing excess cut away extract thumb tacks operations easier fiber glass has cured two three hours has completely hardened 3 Insert artists flexible palette knife rear form under fiberglass Saran Wrap Japa nese artist paint mixing knife used 92 Model Aviation author 3-in flexible blade tapered thickness 014 inch tip 028 inch handle Also sides knife slightly tapered tip bent upward almost im perceptible amount Slide knife axi ally along surface work 3600 around formthe same way cooks re move cakes layer-cake pans will free fiberglass form Some slight temporary stretching may oc cur Saran Wrap may displaced partially Repeat process until fiberglass crankcase can pulled form author has omitted ba sic details easy-does-it method cause has published Hobby poxy other detailed published articles following comments will assist decision making emphasize certain important details Three layers glass cloth good coatings Hobbypoxy II will make light crankcase five layers glass cloth starting medium weight finishing light weight glass cloth would better Smoother thinner coatings epoxy can applied epoxy kept warm during ap plication means small hair dryer Bubbles can excluded careful ap plication under warm conditions worry about bubblessince mar surface can opened filled later show painted Care should taken prevent roundoff flats crankcase provided mounting engine cylinders can accomplished taping layer foam rubber over deflated balloon press evenly completely around section having flats epoxy hardens use rubber bands re tain foam rubber because will localize pressure too much per manently indent fiberglass Masking tape works well hold foam rubber place engine cowling form made us ing layers scrap plastic foam shaped a sheets laminated front back serve templates prevent distortion rounding front back corners under pressure holding dowel built form After form shaped size author used US Gypsum Top Coat mixed water fill pores plastic foam blend shape form almost dry hard form completely sanded Top Coat easily sanded very rough fully hard ened possible sand easily very slight amount moisture still remains just prior final hardening Top Coat can better job less ex pense compared use filler coating made Tite Bond cement Commercially Top Coat used pre pared wall surfaces cover nail indenta tions joints finish coat can made very smooth Used plastic foam surface strong coating insulates protects plastic foam damage hot air used soften smooth epoxy coating need very thick thinner ap plications preferred reduce number coatings have applied take care shrinkage can occur thick sections Waxing form recommended since Saran Wrap can applied easily shrunk very neatly form After fiberglass work completed flexible palette knife used previously explained help re move cowling damage either cowling form author tried success locally procure balloons large enough easy-does-it method making engine cowling Jumbo-size 16 diameter balloons procured quite big enough cowl ing Therefore usual amount sanding necessary smooth finish word caution attempt ing use easy-does-it method Secure glass cloth well thumb tacks areas cut away prevent shifting due balloon breakage slippage Bal loons little too small may go onto form slip back off again especially back turned doing position loose fiber glass cloth will shifted Following rule thumb balloon least twice big form usually helps prevent trouble sloping shape engine cowling encouraged slippage balloons glance landing gear may tend make potential builder have second thoughts author confesses item did delay start project Happily landing gear came out right first time very little extra effort using four single pieces i/i diam eter piano wire finished product Since landing gear has 12 strut members wire simulates several struts order conserve building time piano wire author played around coat hanger wire develop side gear though calculated angles bends lengths struts paid attention lengths bent wire fit mount ing attach points soft pat tern wires correctly shaped pieces piano wire bent exactly same way Having completed side opposite side gear bent soft wire reversing bends required pieces piano wire bent duplicate side small vise mark ing Kodak negative pencil authors preference pair abrasive cut-off discsmounted arbor chuck Dremel toolwere tools used work piano wire coat hanger wire initially straightened first strut length marked wire allowance bend Having made bend next strut length marked wire al lowance bend process repeated until bends made adjusted meet attach points same procedure used piano wire using soft wire pattern visu al guide During design landing gear noted torsional restraint could utilized strengthen gear rather relying resistance bending alone done use grooved maple landing gear block Top Flite firmly af fixed screws epoxy back bottom edge plywood firewall Also using two other separate pieces short lengths grooved maple blocks tached points provided immediately front leading edge bottom wing front side plywood bulk head number 2 use mounting attach points piano wire started axle bent angle up toward middle firewall mounting block bent lay groove reverse direction exit same side turned up slightly inverted N bent side fuselage bulkhead number 2 Straps screws hold torsional portion groove after wire end plugged side fuselage hard wood separator block shown drawing attached landing gear block prevent shift torsional sections toward middle slipping groove under holding straps second piece wire formed attach rearward cowling near top longeron fuselage bent downward include Oleo strut bent under axle back under lower wing attach near center bottom fuselage rear trailing edge left right upper ends attach through individual Nylon brackets cut single CG Nylon nose-gear bracket bolted back plywood firewall ends held wheel collars rearward ends bent right angles inserted holes drilled 94 Model Aviation SCALE CLASICS Plans & Construction Manual CURTISS HAWK POESTINSON RELIANT BRO V Scale 945 Span S220 V Scale 126 Spat250 2Scale 63 Span S12 2Scale 84Span1500 11tSoale 47VoSpan 1000 l0Soela 63 Span$1260 CURTISS GOSHAWK FIlCO 2 Scale 63 SpanS1S~ CURTISS GULFHAWK lA . 2Soale 63 Span 51600 Scale 94 5pa 63000 Peaee Add 6160 P 040 Foetag sod 0e,dllog. OutSide US Add $300Make alt PSymeete Richard G Barron1213 Holly Spring Ln Grand Blanc MichIgan 48439 Seed Slos Complete toomatlen INSTALL AfidUun FUEL TANK ITS GOOD TO KNOW ITS IN THERE FULL TANK SYSTEM Modelers agree Sullivan has put gether k thats really can now fill tank top bubble allows enough room air tubing fitting neatly inside bubble tanks except smaller 4 oz clude Klapper-Klunk stiff-arm klunk klunk pick-ups se own system NEV-R-LEAK fuel tanks have standard favorite years Made better bubble-top FULL TANK SYSTEM now ll become tanks youll ever want use rectangular piece Epoxy printed cir cuit board attached bottom center area lower wing mounting block notched Nylon strap bolted under through lower wing constrains ends wire holes Epoxy mounting plate Attachment wire looped under axle axle itself matter personal preference author preferring use binding wire sol der made pair aluminum parts Nylon other materials could used instead point counts number bends wires will find number equal little wire gears affix back fire wall due number bends required prevent displacement firewall gear stronger construction others made size wire side tripod struts attaches top Oleo strut Oleo strut together two lower struts likewise forms tripod attaching wheel hub Application dope can expedited using 3-in cubes Polyurethane instead brush Use small aluminum pan margarine container hold dope Soak about dope side cube apply covering slight pressure will feed dope side pores cube reducing drag stroke However first coat silk cube should held off instant encourage slight dryness lightly touched silk ap ply too much dope cause runs Since weight especially tail has detri mental effect flying quality apply minimum amount dopein particular heavier color dope Experience indicated 20 right 20 down thrust would good first ap proximation angles needed straight level flight Offsets base engine mount about 5/32 inch can used bring propeller shaft center cowling better appear ance however should borne mind also offsets engine thrust line will decrease thrust correction angles required angles offsets desired together 20 positive set ting stabilizer should set first test flight Under conditions takeoff flight should accomplished less panic greater safety Hope fully trim adjustments will within limits trim available transmitter Any thought engine mount could machined thrust correction discarded found 148 inch would have removed measured point edge slanted 450 axis vertical 3-in diameter engine mount base Therefore large wedgeshaped aluminum shim form annulus ring washer made drilled provide mounting holes required engine mount installation Fig provides scientific accurate way determining specs making such aluminum wedge suggested 3/16 thick alumi num sheet stock used machining circular wedge shim Machine shim scribe position axis drill mounting holes type shim will produce firmest engine mount support Wing strut landing gear strut angles lengths can calculated similarly using compound angle formulas Simplest way visualize problem draw pyramid corner edge perpen dicular arectangular base longest edge representing strut question perpendicular distance tween attach points bends coordinates base can obtained original drawings accordance scale Projected angles can measured directly drawings unaffected scale Formulas type calculation listed Mechanics Vest Pocket Reference Book full explanation compound angles contained Practical Shop Mathemat ics Vol No 2 J H Wolfe E R Phelps McGraw-Hill After having prepared description good method use applying dope especially silk winter arrived odor dope would have offen sive Coverite applied word February 1 979 95 A Enough space air bubble B Fill tank top C Tube goes up air bubble 12-INCH LENGTH OFSULLI-CONETUBING FREE WITH EVERYTANK ATYPICAL ELEVAT/RuOOER INSlALLATION -xxxx 7G&PLIiIIiNGE COONEY * EASY INSTALLATION * NO AR GAP * FREE MOVEMENT * STRONG AND LIGHTWEIGHT MPLETELY FUELPROOF * COMPATIBLE WITH ALL IRON-ON COVERINGS FOURMOST RACING PRODU CTS 24th Avenue caution black color Coverite used tended bleed yellow Cover ite insignia trim Glaskote later used seal lettering would have prevented color bleeding painted contact surface prior trimming final installation assembly methods devised retaining fuel tank installing muffler providing good looking landing light lens First found square 12ounce Sullivan fuel tank fits nicely quart size cardboard milk carton simple matter cut position hold container place bulkhead #2 flat pieces apple taffy sticks important make installation removable access servos Another good way make engine bulkhead removable firewall complete engine fuel tank Secondly Slim Line Muffler fine engine installation should modified install right angles Beside looking much better muffler can re main engine during assembly removal cowling Viewed side modified muffler appears position imitates air inlet dummy engine Thirdly very realistic looking lens landing lights can made about five minutes Simply acquire pair plastic egg containers wife girl friend has purchased two pair Leggs panty hose Use largest end egg scribe required diameter circle inside spinning small compass Using pair scissors cut crack ing inscribed circle Attach lenses landing lights Pliobond cement record landing lights black dress up piano wire landing gear decided use large size straight plastic soda straws Short pieces black neoprene tubing Sullivan split snapped around wire concentrically space ends split plastic soda straws conceal split straws two concentric straws used splits oriented 1800 apart wire outside split can covered TYPICAL AILERO*J1NSTA L-A ON xX-x 35 length invisible Scotch tape fore after painting Likewise ends can retained wrap same tape Tests proved tape could doped fact dope will stay tape little loss gloss whereas dope may tend flake off smooth plastic straws flexed Sanding straws lightly roughen surface helps flight straws fly off Since Olco struts larger decided use cut off plastic barrel sec tions black felt pens sections pens split lengthwise means Xacto saw snapped over piano wire Concentric spacing accomplished build-up split neoprene tubing Axial shift pieces pens prevented Goo cement rubber like modelers cement author also applies prevent wheel colars com ing off etc preparation flying landing lights scale engine cowl re moved pair 3-in diameter wheels 13-5 propeller installed model balanced 12 ounces lead two 6 ounce sinkers engine mount moved CG forward about 30% location general everything done compen sate unwanted torque effects assure model would fly tail heavy Now happiest reward ing part test flights prototype Frank Stanton friend fellow club member agreed serve test pilot club field Johnsville NADC Warminster PA first check flight complete success Indications less ballast could have used trim adjustments required 50% left rudder trim 100% up elevator trim means transmitter trim ad justments airplane flew well trim changes surfaces second flight became stunt flight Would believe Frank flew large portion rolling circle Barring low sun position Frank probably would have gone way around Allowing fact model being flown very capable flier observers noted excellent manner Pitcairn Mailwing responded flight After test flights Franks comments Its good flying airplane Its piece cake fly next flying session Pitcairn Mailwing flown dressed-up inflight pictures time ballast weight reduced about 8 ounces Two flights flown shoot takeoff fly-by landing pictures surpris ing model did roll fast cause ailerons lower wing no differential utilized Aileron turns good turns made using rudder resulted loss al titude unusual Indications smooth grass fly ing fields would preferable hard sur face runways agreement ground handling original airplane flown landing lights scale engine cowl configuration tends protect damage should ground loop occur propeller sur vived two ground loops hard runways final note author has recently purchased Giant Round Balloons made Mexico distributed through World Toy House balloons look very promising use making large en gine cowls easy-does-it method course modelers should overlook possibility obtaining suitable balloons Hobbypoxy people origi nated method RC Aerobatics/Van Putte continued page 28 does guarantee Novice pattern tro phy enough good fliers around have make very difficult great flier win sport airplane several ways proceed al leviating situation have pitfalls will probably take grass roots movement have much effect pattern flying since major changes rules very infrequent unless widespread demonstration need desire change Contest Di rectors will have make decisions offer competition line proposed rule changes see work out National Society Radio Controlled Aerobatics NS RCA can strong fac tor proposed rule changes NSRCA district vice presidents should given feedback proposed changes issues can aired K Factor monthly newsletter NSRCA arent already NSRCA member send $10 1979 dues Mrs Sally Brown Secretary Treasurer 8534 Huddleston Drive Cincinnati OH 45236 thing has tried Con test Directors contests around coun try has introduction special Novice class beginners pattern com petition large contests have 96 Model Aviation LARGESMALL fit saafoces 1/8 thicker
Edition: Model Aviation - 1979/02
Page Numbers: 16, 17, 18, 19, 20, 21, 22, 23, 92, 94, 95, 96
NO OCR TEXT 4 have re will pose maximum ced 45 pounds p ai ed Ltuyin ce md 35 air time Cha I/16X ALL RIBS L F RC NO OCR TEXT LONOING LIGHTCGT-OLIT 2 REQUIRED lODE WING PLUS FOR POSITION REDUCE ROROER TO FLAT OURFACE I/WIG OR PLYWOOD INSERT OIOL MODIDTEO LANDING REAR SUPPORT BRACKET 0 REGOELEVATORDRONE SERVO MATE FROM NYLON NOSE WHEEL MOUNTINGERVSTIPS-lO SHOWN THROTTLE POSH ROD CA THROST OFFSET LI L 403 RDRGLSA7fl FORMER N 1 4Sg O~lL ERAFYHECI ~1 1 V ROSOER IV SERVO II ID INCH IIIII BELLCRANE KiL4Lii- Th---- hR SHEET WULSA TEMPORARY MOLDING RHUCE FORMER 3 IN 3G Ill I I I/ID SHEET HARDWOOD LANDING GEARI HOLWITING RLOCIS NOTE MOUNT ENLUNE 8TH ST DOWN THRUST DM0 ST RIGHT THRUST SIDE VIEW ODES NOT GROW ANT DOWN THRUST CANT FRONT OF TGWLWG TO AGREE WITH ANGLES SF TRRSSY OFFSET NOTE OGRE LONER PORTION SF FORMERS-S4 U T 8 FROM I/RD I/O DOLOR INST 511/WE OR TEMPLATESTG /8 BALSA FORMER 7OR SHEETFORMER S3132530R BALSA RALOG 3/3251/4 BALSA UTTUER OGRARE STRUTS ST FGSELAGE OSING HARDFORMERS WOOD SPACERD 0415 FRONTFORMER-U C 3/KIN HEGH___________G ALOD HEADREST /30 PLYWOUDWINDSHIELD COWLING I/lU PLYWOOD WING SADOL SPLIT IWOPREIWIGOERYG 2 EACH SIDE IGOFT FOAMREADTURING EGO/HO I]-iPOOHEDGING REMO5E RGLSUIIERHFT INSERT VWRL-Y -DECI WOOD POW I -- I/IN WALGA- ARA5STRUTG -I- L VEPRESENTATISE CYLINDERSGRFACE TO SGRFUCE___________ CRUNREADE IN LOWLINS FORUS CALCULATED___________ BRADY WHIRLWIND 15RUTTERY BOG SCALE ENGINE YfFIAIYD,STS/REII SCALE PROPELLER SIZE- lAO/H DIG/ HP Al FRE ENGINE GROWN 2ROLES FOR 3/KIND3/RG3/R TRIUNGULUR WING MOUNTING DOWELS3/H D3/R MUPLEDALSA INDIDE WING MOGNYING CROSS MEMHERI/IN EPOXY PC ROGRO I-OR LONG CALCULATEDG1I-I/U WIDE DRILL 2 HOLES hR GIG CS1/4 D3/RGI/ID NYLDN MLOCD3/H E TO G POD LANDING DEAR NOTCH I/W DEEP WITH S/H GIRDING DALL AT CENTER FOR RHDEREK K 2j 4 EDIA25/30 HER THICKNESSICC NOTE IWSDE MEGODREMENTT-GRTO DUD II /R#35 OIHLL 030 NOTE 2 STERPLANE WING STRUTS CALCULATED RR2 ISSURFACE TO OSREUCE DYRAL 3/H WIDE TEE ATTUCH POINTS OR WINGS / -S/FOR MER-2 I/A PLYWOOD 04 ALAATTERY DOD 0 OGGO 5/HG VH RADIO SHAdS MINI ROGMSDIFIEO SR DELLERUNK OH AL U CHANNEL I/A WIDE MADE FROM MINFROG SCRAP AL GOD 3/H MAPLE GEFOET SPACER H VA AL S/IN WIDE LENOTH TOSGIT REODIRED CONTROL HORDE BOLT SIDE BY SIDE TO HELLERORN GRILL POR DOD JACK SHAFT SPREE WITH REVLON TURES TOP NOTE WIRE NO3 OGII34ZIGLO FRUTAT SlEW 4/HOV SAYLOR CLEFIG STRUT FITTINGTHRI/ST ASIS ID REQUIRED N 0 0 5 IEM GSLE-i4,MOTTOM OR S PIANO WIRE -I I/A PlYWOOD FACRO SPUD SIGESOHI F BRACE 1 ANGLE EACH END LANDIBO ACAR BOLT FRILL S/IA U FR RAROWOOS INSERTWERBNR B-US SIDE P1501 NERDE FR I/S SALT RUSSIAROFRA FOR STRUT MB-B LOWER WINS BOLTALERIS1 PUSH ROE ALE LOCATIONS/ / IIII 3/ASIA RAROWOOG UTWELS MARE TAO UPPROS 2 IN ION 2/A NULGA SHAPE TO AIRFOIL II~ii /II LOWER WING 3/BUS/B BALSA UPPER WINO test hop builwntnrustl e fuselage blackin quart iling npound angle andMuseum utas derived DC o axis y 9 degrnon Airport Virginia West urn M engine mourn Ige new axis Y tan B e ie cc FIRE example using ved formulas nc Tables thrust C4 e ptnuary 1959 Amer II 1960 Air ing o ar bracinp lower br ously Pu ueI th nt model like mi Chief E ailerons ne lower ng UI isnodels t moving downwar neutral aft th move OSI1I ood way c d yaw Sta Openers/Winter continued page 4 cloaks clock-watchers see some hearts can saddened Like TVs Dangerfield dont get no respect see irony power center AMA Washington Un der by-laws membership elects district vice presidents also Council members Almost far away states caliber people testifies judgment members elected themthey capable As group meet four times year deal best abil ities matters before qualifications businessmen pri vate life impeccable dont defend perfect expected anyone human being perhaps feel no defense FO needed welcome Perhaps make mistakes cannot say Perhaps timing things always brilliant devious calculating po lit icalthey modelers serving volun tarily know believe what decide motivated what feel best Sometimes means Executive Director minority Council meeting happens right Council charge no governmental agency-type Secre tary Washington can Big Brother us what FO about say could receive pink slip simply Recent actions have taken place done some us may drop wayside awhile will go growing Council hear message members call out proceed caution lay out new programs added expenses things members think AMA should Most members above dues increase less cost next weeks fuel buy other magazine almost much AMA asks magazine insurance other benefits others among us ask Should go response few people have ad dressed editor let us keep cool Dues increases however necessary brew negative reactionsnobody willingly ac cepts higher prices cant let ex perts confuse us individual mem bers can make own assessments finally patient readers may say Fine youAMA pays salary answer simply should hope can well other ways like old warhorse FO likes sniff battlefield challenge improve magazine see firmly its way mem bership tool par excellance help AMA grow prosper right know way words used discussion parody Supreme Court deci sions meaning Should everyones cor respondence AMA headquarters plastered billboard present instance publications demand AMA print letter critique logically based upon imagined need shed light some secretive wrong doing AMA has asked account pa per clips sugar cubes etc broken down AMA use Model Aviation use true joke think Watergate Deep Throat Will Judge Jaworski appear doorway Enough already Speaking rights almost 50000 people wanted paid Model Aviation 1978 have Can two critics seriously think people great majority Open mem bers can denied what prefer troubled FO offers words late President Jack Kennedy great enemy truth very ten liedeliberate contrived dishonest mythpersistent persuasive unrealistic Too often hold fast cliches fore-bear ers subject facts prefabricat ed set interpretations enjoy comfort opinion discom fort thought Greatest Show/Howard continued page 13 tions booth several years draws lots interest spec tators AMA represented president Johnny Clemens Larry Bolich special events director Earl Witt secretary-treasurer AMA always very responsive type public exposure could go on about fun fellowship fliers enjoy show photos show much words can tell can see Flying Circus future make plans participate Enjoy hobby Pitcairn/Stott continued page 23 per wing span would have 66 inches An increase over 4 inches upper wing span would have made assembled model airplane too large placed back seat automobile scale model designer builder must decide detailed scale model should decision involves consideration available material time money shop equipment desired usage ability Now Sport Scale Stand-Off Scale gaining popular ity over true scale choice has broadened authors decisions largely compromise based desire fun fly moderately windy weather possibly enter contest requiring exact scale Although model deviates scale selection airfoil slightly larger engine scale plans show true outline except previously noted realistic appearance slightly over-size 2 inch ot Williams Wright Whirlwind J5 installed way largely conceal inverted 60 engine Further streamlining camouflaging engine accomplished fiber glass cowling provide much space around engine possible muffler permit installation battery pack under cowling desired help establish correct CG location resorting- excess dead weight balance common practice remove scalelike engines routine test flights necessary substitute equivalent weight prevent shift CG reason fiberglass cowl engine crankcase formed separate molded parts crankcase form made hard balsa previously used packing crating because its weight balsa cut discs laminated before shaping size During machining observed form tended turn out round lathe due end grain cutting same other grain directions Care taken bring form back round hand work Finally form fitted -in diameter wood-holding dowel centrally located extend axially out back dowel can supported easily vise applying fiber glass No attempt made provide draft taper form diameters since believed fiberglass crank case would have cut form anyway pleasant sur prise easy-does-it method completed fiberglass crankcase removed piece damage either crankcase form method removal follows I Remove thumb tacks held Saran Wrap glass cloth place being coated Hobbypoxy II during placement balloon cover lay-up 2 Trim fiberglass rear outer di ameter assure no fiberglass locks around back corner form rough out front open hole fiber glass cowl removing excess cut away extract thumb tacks operations easier fiber glass has cured two three hours has completely hardened 3 Insert artists flexible palette knife rear form under fiberglass Saran Wrap Japa nese artist paint mixing knife used 92 Model Aviation author 3-in flexible blade tapered thickness 014 inch tip 028 inch handle Also sides knife slightly tapered tip bent upward almost im perceptible amount Slide knife axi ally along surface work 3600 around formthe same way cooks re move cakes layer-cake pans will free fiberglass form Some slight temporary stretching may oc cur Saran Wrap may displaced partially Repeat process until fiberglass crankcase can pulled form author has omitted ba sic details easy-does-it method cause has published Hobby poxy other detailed published articles following comments will assist decision making emphasize certain important details Three layers glass cloth good coatings Hobbypoxy II will make light crankcase five layers glass cloth starting medium weight finishing light weight glass cloth would better Smoother thinner coatings epoxy can applied epoxy kept warm during ap plication means small hair dryer Bubbles can excluded careful ap plication under warm conditions worry about bubblessince mar surface can opened filled later show painted Care should taken prevent roundoff flats crankcase provided mounting engine cylinders can accomplished taping layer foam rubber over deflated balloon press evenly completely around section having flats epoxy hardens use rubber bands re tain foam rubber because will localize pressure too much per manently indent fiberglass Masking tape works well hold foam rubber place engine cowling form made us ing layers scrap plastic foam shaped a sheets laminated front back serve templates prevent distortion rounding front back corners under pressure holding dowel built form After form shaped size author used US Gypsum Top Coat mixed water fill pores plastic foam blend shape form almost dry hard form completely sanded Top Coat easily sanded very rough fully hard ened possible sand easily very slight amount moisture still remains just prior final hardening Top Coat can better job less ex pense compared use filler coating made Tite Bond cement Commercially Top Coat used pre pared wall surfaces cover nail indenta tions joints finish coat can made very smooth Used plastic foam surface strong coating insulates protects plastic foam damage hot air used soften smooth epoxy coating need very thick thinner ap plications preferred reduce number coatings have applied take care shrinkage can occur thick sections Waxing form recommended since Saran Wrap can applied easily shrunk very neatly form After fiberglass work completed flexible palette knife used previously explained help re move cowling damage either cowling form author tried success locally procure balloons large enough easy-does-it method making engine cowling Jumbo-size 16 diameter balloons procured quite big enough cowl ing Therefore usual amount sanding necessary smooth finish word caution attempt ing use easy-does-it method Secure glass cloth well thumb tacks areas cut away prevent shifting due balloon breakage slippage Bal loons little too small may go onto form slip back off again especially back turned doing position loose fiber glass cloth will shifted Following rule thumb balloon least twice big form usually helps prevent trouble sloping shape engine cowling encouraged slippage balloons glance landing gear may tend make potential builder have second thoughts author confesses item did delay start project Happily landing gear came out right first time very little extra effort using four single pieces i/i diam eter piano wire finished product Since landing gear has 12 strut members wire simulates several struts order conserve building time piano wire author played around coat hanger wire develop side gear though calculated angles bends lengths struts paid attention lengths bent wire fit mount ing attach points soft pat tern wires correctly shaped pieces piano wire bent exactly same way Having completed side opposite side gear bent soft wire reversing bends required pieces piano wire bent duplicate side small vise mark ing Kodak negative pencil authors preference pair abrasive cut-off discsmounted arbor chuck Dremel toolwere tools used work piano wire coat hanger wire initially straightened first strut length marked wire allowance bend Having made bend next strut length marked wire al lowance bend process repeated until bends made adjusted meet attach points same procedure used piano wire using soft wire pattern visu al guide During design landing gear noted torsional restraint could utilized strengthen gear rather relying resistance bending alone done use grooved maple landing gear block Top Flite firmly af fixed screws epoxy back bottom edge plywood firewall Also using two other separate pieces short lengths grooved maple blocks tached points provided immediately front leading edge bottom wing front side plywood bulk head number 2 use mounting attach points piano wire started axle bent angle up toward middle firewall mounting block bent lay groove reverse direction exit same side turned up slightly inverted N bent side fuselage bulkhead number 2 Straps screws hold torsional portion groove after wire end plugged side fuselage hard wood separator block shown drawing attached landing gear block prevent shift torsional sections toward middle slipping groove under holding straps second piece wire formed attach rearward cowling near top longeron fuselage bent downward include Oleo strut bent under axle back under lower wing attach near center bottom fuselage rear trailing edge left right upper ends attach through individual Nylon brackets cut single CG Nylon nose-gear bracket bolted back plywood firewall ends held wheel collars rearward ends bent right angles inserted holes drilled 94 Model Aviation SCALE CLASICS Plans & Construction Manual CURTISS HAWK POESTINSON RELIANT BRO V Scale 945 Span S220 V Scale 126 Spat250 2Scale 63 Span S12 2Scale 84Span1500 11tSoale 47VoSpan 1000 l0Soela 63 Span$1260 CURTISS GOSHAWK FIlCO 2 Scale 63 SpanS1S~ CURTISS GULFHAWK lA . 2Soale 63 Span 51600 Scale 94 5pa 63000 Peaee Add 6160 P 040 Foetag sod 0e,dllog. OutSide US Add $300Make alt PSymeete Richard G Barron1213 Holly Spring Ln Grand Blanc MichIgan 48439 Seed Slos Complete toomatlen INSTALL AfidUun FUEL TANK ITS GOOD TO KNOW ITS IN THERE FULL TANK SYSTEM Modelers agree Sullivan has put gether k thats really can now fill tank top bubble allows enough room air tubing fitting neatly inside bubble tanks except smaller 4 oz clude Klapper-Klunk stiff-arm klunk klunk pick-ups se own system NEV-R-LEAK fuel tanks have standard favorite years Made better bubble-top FULL TANK SYSTEM now ll become tanks youll ever want use rectangular piece Epoxy printed cir cuit board attached bottom center area lower wing mounting block notched Nylon strap bolted under through lower wing constrains ends wire holes Epoxy mounting plate Attachment wire looped under axle axle itself matter personal preference author preferring use binding wire sol der made pair aluminum parts Nylon other materials could used instead point counts number bends wires will find number equal little wire gears affix back fire wall due number bends required prevent displacement firewall gear stronger construction others made size wire side tripod struts attaches top Oleo strut Oleo strut together two lower struts likewise forms tripod attaching wheel hub Application dope can expedited using 3-in cubes Polyurethane instead brush Use small aluminum pan margarine container hold dope Soak about dope side cube apply covering slight pressure will feed dope side pores cube reducing drag stroke However first coat silk cube should held off instant encourage slight dryness lightly touched silk ap ply too much dope cause runs Since weight especially tail has detri mental effect flying quality apply minimum amount dopein particular heavier color dope Experience indicated 20 right 20 down thrust would good first ap proximation angles needed straight level flight Offsets base engine mount about 5/32 inch can used bring propeller shaft center cowling better appear ance however should borne mind also offsets engine thrust line will decrease thrust correction angles required angles offsets desired together 20 positive set ting stabilizer should set first test flight Under conditions takeoff flight should accomplished less panic greater safety Hope fully trim adjustments will within limits trim available transmitter Any thought engine mount could machined thrust correction discarded found 148 inch would have removed measured point edge slanted 450 axis vertical 3-in diameter engine mount base Therefore large wedgeshaped aluminum shim form annulus ring washer made drilled provide mounting holes required engine mount installation Fig provides scientific accurate way determining specs making such aluminum wedge suggested 3/16 thick alumi num sheet stock used machining circular wedge shim Machine shim scribe position axis drill mounting holes type shim will produce firmest engine mount support Wing strut landing gear strut angles lengths can calculated similarly using compound angle formulas Simplest way visualize problem draw pyramid corner edge perpen dicular arectangular base longest edge representing strut question perpendicular distance tween attach points bends coordinates base can obtained original drawings accordance scale Projected angles can measured directly drawings unaffected scale Formulas type calculation listed Mechanics Vest Pocket Reference Book full explanation compound angles contained Practical Shop Mathemat ics Vol No 2 J H Wolfe E R Phelps McGraw-Hill After having prepared description good method use applying dope especially silk winter arrived odor dope would have offen sive Coverite applied word February 1 979 95 A Enough space air bubble B Fill tank top C Tube goes up air bubble 12-INCH LENGTH OFSULLI-CONETUBING FREE WITH EVERYTANK ATYPICAL ELEVAT/RuOOER INSlALLATION -xxxx 7G&PLIiIIiNGE COONEY * EASY INSTALLATION * NO AR GAP * FREE MOVEMENT * STRONG AND LIGHTWEIGHT MPLETELY FUELPROOF * COMPATIBLE WITH ALL IRON-ON COVERINGS FOURMOST RACING PRODU CTS 24th Avenue caution black color Coverite used tended bleed yellow Cover ite insignia trim Glaskote later used seal lettering would have prevented color bleeding painted contact surface prior trimming final installation assembly methods devised retaining fuel tank installing muffler providing good looking landing light lens First found square 12ounce Sullivan fuel tank fits nicely quart size cardboard milk carton simple matter cut position hold container place bulkhead #2 flat pieces apple taffy sticks important make installation removable access servos Another good way make engine bulkhead removable firewall complete engine fuel tank Secondly Slim Line Muffler fine engine installation should modified install right angles Beside looking much better muffler can re main engine during assembly removal cowling Viewed side modified muffler appears position imitates air inlet dummy engine Thirdly very realistic looking lens landing lights can made about five minutes Simply acquire pair plastic egg containers wife girl friend has purchased two pair Leggs panty hose Use largest end egg scribe required diameter circle inside spinning small compass Using pair scissors cut crack ing inscribed circle Attach lenses landing lights Pliobond cement record landing lights black dress up piano wire landing gear decided use large size straight plastic soda straws Short pieces black neoprene tubing Sullivan split snapped around wire concentrically space ends split plastic soda straws conceal split straws two concentric straws used splits oriented 1800 apart wire outside split can covered TYPICAL AILERO*J1NSTA L-A ON xX-x 35 length invisible Scotch tape fore after painting Likewise ends can retained wrap same tape Tests proved tape could doped fact dope will stay tape little loss gloss whereas dope may tend flake off smooth plastic straws flexed Sanding straws lightly roughen surface helps flight straws fly off Since Olco struts larger decided use cut off plastic barrel sec tions black felt pens sections pens split lengthwise means Xacto saw snapped over piano wire Concentric spacing accomplished build-up split neoprene tubing Axial shift pieces pens prevented Goo cement rubber like modelers cement author also applies prevent wheel colars com ing off etc preparation flying landing lights scale engine cowl re moved pair 3-in diameter wheels 13-5 propeller installed model balanced 12 ounces lead two 6 ounce sinkers engine mount moved CG forward about 30% location general everything done compen sate unwanted torque effects assure model would fly tail heavy Now happiest reward ing part test flights prototype Frank Stanton friend fellow club member agreed serve test pilot club field Johnsville NADC Warminster PA first check flight complete success Indications less ballast could have used trim adjustments required 50% left rudder trim 100% up elevator trim means transmitter trim ad justments airplane flew well trim changes surfaces second flight became stunt flight Would believe Frank flew large portion rolling circle Barring low sun position Frank probably would have gone way around Allowing fact model being flown very capable flier observers noted excellent manner Pitcairn Mailwing responded flight After test flights Franks comments Its good flying airplane Its piece cake fly next flying session Pitcairn Mailwing flown dressed-up inflight pictures time ballast weight reduced about 8 ounces Two flights flown shoot takeoff fly-by landing pictures surpris ing model did roll fast cause ailerons lower wing no differential utilized Aileron turns good turns made using rudder resulted loss al titude unusual Indications smooth grass fly ing fields would preferable hard sur face runways agreement ground handling original airplane flown landing lights scale engine cowl configuration tends protect damage should ground loop occur propeller sur vived two ground loops hard runways final note author has recently purchased Giant Round Balloons made Mexico distributed through World Toy House balloons look very promising use making large en gine cowls easy-does-it method course modelers should overlook possibility obtaining suitable balloons Hobbypoxy people origi nated method RC Aerobatics/Van Putte continued page 28 does guarantee Novice pattern tro phy enough good fliers around have make very difficult great flier win sport airplane several ways proceed al leviating situation have pitfalls will probably take grass roots movement have much effect pattern flying since major changes rules very infrequent unless widespread demonstration need desire change Contest Di rectors will have make decisions offer competition line proposed rule changes see work out National Society Radio Controlled Aerobatics NS RCA can strong fac tor proposed rule changes NSRCA district vice presidents should given feedback proposed changes issues can aired K Factor monthly newsletter NSRCA arent already NSRCA member send $10 1979 dues Mrs Sally Brown Secretary Treasurer 8534 Huddleston Drive Cincinnati OH 45236 thing has tried Con test Directors contests around coun try has introduction special Novice class beginners pattern com petition large contests have 96 Model Aviation LARGESMALL fit saafoces 1/8 thicker
Edition: Model Aviation - 1979/02
Page Numbers: 16, 17, 18, 19, 20, 21, 22, 23, 92, 94, 95, 96
NO OCR TEXT 4 have re will pose maximum ced 45 pounds p ai ed Ltuyin ce md 35 air time Cha I/16X ALL RIBS L F RC NO OCR TEXT LONOING LIGHTCGT-OLIT 2 REQUIRED lODE WING PLUS FOR POSITION REDUCE ROROER TO FLAT OURFACE I/WIG OR PLYWOOD INSERT OIOL MODIDTEO LANDING REAR SUPPORT BRACKET 0 REGOELEVATORDRONE SERVO MATE FROM NYLON NOSE WHEEL MOUNTINGERVSTIPS-lO SHOWN THROTTLE POSH ROD CA THROST OFFSET LI L 403 RDRGLSA7fl FORMER N 1 4Sg O~lL ERAFYHECI ~1 1 V ROSOER IV SERVO II ID INCH IIIII BELLCRANE KiL4Lii- Th---- hR SHEET WULSA TEMPORARY MOLDING RHUCE FORMER 3 IN 3G Ill I I I/ID SHEET HARDWOOD LANDING GEARI HOLWITING RLOCIS NOTE MOUNT ENLUNE 8TH ST DOWN THRUST DM0 ST RIGHT THRUST SIDE VIEW ODES NOT GROW ANT DOWN THRUST CANT FRONT OF TGWLWG TO AGREE WITH ANGLES SF TRRSSY OFFSET NOTE OGRE LONER PORTION SF FORMERS-S4 U T 8 FROM I/RD I/O DOLOR INST 511/WE OR TEMPLATESTG /8 BALSA FORMER 7OR SHEETFORMER S3132530R BALSA RALOG 3/3251/4 BALSA UTTUER OGRARE STRUTS ST FGSELAGE OSING HARDFORMERS WOOD SPACERD 0415 FRONTFORMER-U C 3/KIN HEGH___________G ALOD HEADREST /30 PLYWOUDWINDSHIELD COWLING I/lU PLYWOOD WING SADOL SPLIT IWOPREIWIGOERYG 2 EACH SIDE IGOFT FOAMREADTURING EGO/HO I]-iPOOHEDGING REMO5E RGLSUIIERHFT INSERT VWRL-Y -DECI WOOD POW I -- I/IN WALGA- ARA5STRUTG -I- L VEPRESENTATISE CYLINDERSGRFACE TO SGRFUCE___________ CRUNREADE IN LOWLINS FORUS CALCULATED___________ BRADY WHIRLWIND 15RUTTERY BOG SCALE ENGINE YfFIAIYD,STS/REII SCALE PROPELLER SIZE- lAO/H DIG/ HP Al FRE ENGINE GROWN 2ROLES FOR 3/KIND3/RG3/R TRIUNGULUR WING MOUNTING DOWELS3/H D3/R MUPLEDALSA INDIDE WING MOGNYING CROSS MEMHERI/IN EPOXY PC ROGRO I-OR LONG CALCULATEDG1I-I/U WIDE DRILL 2 HOLES hR GIG CS1/4 D3/RGI/ID NYLDN MLOCD3/H E TO G POD LANDING DEAR NOTCH I/W DEEP WITH S/H GIRDING DALL AT CENTER FOR RHDEREK K 2j 4 EDIA25/30 HER THICKNESSICC NOTE IWSDE MEGODREMENTT-GRTO DUD II /R#35 OIHLL 030 NOTE 2 STERPLANE WING STRUTS CALCULATED RR2 ISSURFACE TO OSREUCE DYRAL 3/H WIDE TEE ATTUCH POINTS OR WINGS / -S/FOR MER-2 I/A PLYWOOD 04 ALAATTERY DOD 0 OGGO 5/HG VH RADIO SHAdS MINI ROGMSDIFIEO SR DELLERUNK OH AL U CHANNEL I/A WIDE MADE FROM MINFROG SCRAP AL GOD 3/H MAPLE GEFOET SPACER H VA AL S/IN WIDE LENOTH TOSGIT REODIRED CONTROL HORDE BOLT SIDE BY SIDE TO HELLERORN GRILL POR DOD JACK SHAFT SPREE WITH REVLON TURES TOP NOTE WIRE NO3 OGII34ZIGLO FRUTAT SlEW 4/HOV SAYLOR CLEFIG STRUT FITTINGTHRI/ST ASIS ID REQUIRED N 0 0 5 IEM GSLE-i4,MOTTOM OR S PIANO WIRE -I I/A PlYWOOD FACRO SPUD SIGESOHI F BRACE 1 ANGLE EACH END LANDIBO ACAR BOLT FRILL S/IA U FR RAROWOOS INSERTWERBNR B-US SIDE P1501 NERDE FR I/S SALT RUSSIAROFRA FOR STRUT MB-B LOWER WINS BOLTALERIS1 PUSH ROE ALE LOCATIONS/ / IIII 3/ASIA RAROWOOG UTWELS MARE TAO UPPROS 2 IN ION 2/A NULGA SHAPE TO AIRFOIL II~ii /II LOWER WING 3/BUS/B BALSA UPPER WINO test hop builwntnrustl e fuselage blackin quart iling npound angle andMuseum utas derived DC o axis y 9 degrnon Airport Virginia West urn M engine mourn Ige new axis Y tan B e ie cc FIRE example using ved formulas nc Tables thrust C4 e ptnuary 1959 Amer II 1960 Air ing o ar bracinp lower br ously Pu ueI th nt model like mi Chief E ailerons ne lower ng UI isnodels t moving downwar neutral aft th move OSI1I ood way c d yaw Sta Openers/Winter continued page 4 cloaks clock-watchers see some hearts can saddened Like TVs Dangerfield dont get no respect see irony power center AMA Washington Un der by-laws membership elects district vice presidents also Council members Almost far away states caliber people testifies judgment members elected themthey capable As group meet four times year deal best abil ities matters before qualifications businessmen pri vate life impeccable dont defend perfect expected anyone human being perhaps feel no defense FO needed welcome Perhaps make mistakes cannot say Perhaps timing things always brilliant devious calculating po lit icalthey modelers serving volun tarily know believe what decide motivated what feel best Sometimes means Executive Director minority Council meeting happens right Council charge no governmental agency-type Secre tary Washington can Big Brother us what FO about say could receive pink slip simply Recent actions have taken place done some us may drop wayside awhile will go growing Council hear message members call out proceed caution lay out new programs added expenses things members think AMA should Most members above dues increase less cost next weeks fuel buy other magazine almost much AMA asks magazine insurance other benefits others among us ask Should go response few people have ad dressed editor let us keep cool Dues increases however necessary brew negative reactionsnobody willingly ac cepts higher prices cant let ex perts confuse us individual mem bers can make own assessments finally patient readers may say Fine youAMA pays salary answer simply should hope can well other ways like old warhorse FO likes sniff battlefield challenge improve magazine see firmly its way mem bership tool par excellance help AMA grow prosper right know way words used discussion parody Supreme Court deci sions meaning Should everyones cor respondence AMA headquarters plastered billboard present instance publications demand AMA print letter critique logically based upon imagined need shed light some secretive wrong doing AMA has asked account pa per clips sugar cubes etc broken down AMA use Model Aviation use true joke think Watergate Deep Throat Will Judge Jaworski appear doorway Enough already Speaking rights almost 50000 people wanted paid Model Aviation 1978 have Can two critics seriously think people great majority Open mem bers can denied what prefer troubled FO offers words late President Jack Kennedy great enemy truth very ten liedeliberate contrived dishonest mythpersistent persuasive unrealistic Too often hold fast cliches fore-bear ers subject facts prefabricat ed set interpretations enjoy comfort opinion discom fort thought Greatest Show/Howard continued page 13 tions booth several years draws lots interest spec tators AMA represented president Johnny Clemens Larry Bolich special events director Earl Witt secretary-treasurer AMA always very responsive type public exposure could go on about fun fellowship fliers enjoy show photos show much words can tell can see Flying Circus future make plans participate Enjoy hobby Pitcairn/Stott continued page 23 per wing span would have 66 inches An increase over 4 inches upper wing span would have made assembled model airplane too large placed back seat automobile scale model designer builder must decide detailed scale model should decision involves consideration available material time money shop equipment desired usage ability Now Sport Scale Stand-Off Scale gaining popular ity over true scale choice has broadened authors decisions largely compromise based desire fun fly moderately windy weather possibly enter contest requiring exact scale Although model deviates scale selection airfoil slightly larger engine scale plans show true outline except previously noted realistic appearance slightly over-size 2 inch ot Williams Wright Whirlwind J5 installed way largely conceal inverted 60 engine Further streamlining camouflaging engine accomplished fiber glass cowling provide much space around engine possible muffler permit installation battery pack under cowling desired help establish correct CG location resorting- excess dead weight balance common practice remove scalelike engines routine test flights necessary substitute equivalent weight prevent shift CG reason fiberglass cowl engine crankcase formed separate molded parts crankcase form made hard balsa previously used packing crating because its weight balsa cut discs laminated before shaping size During machining observed form tended turn out round lathe due end grain cutting same other grain directions Care taken bring form back round hand work Finally form fitted -in diameter wood-holding dowel centrally located extend axially out back dowel can supported easily vise applying fiber glass No attempt made provide draft taper form diameters since believed fiberglass crank case would have cut form anyway pleasant sur prise easy-does-it method completed fiberglass crankcase removed piece damage either crankcase form method removal follows I Remove thumb tacks held Saran Wrap glass cloth place being coated Hobbypoxy II during placement balloon cover lay-up 2 Trim fiberglass rear outer di ameter assure no fiberglass locks around back corner form rough out front open hole fiber glass cowl removing excess cut away extract thumb tacks operations easier fiber glass has cured two three hours has completely hardened 3 Insert artists flexible palette knife rear form under fiberglass Saran Wrap Japa nese artist paint mixing knife used 92 Model Aviation author 3-in flexible blade tapered thickness 014 inch tip 028 inch handle Also sides knife slightly tapered tip bent upward almost im perceptible amount Slide knife axi ally along surface work 3600 around formthe same way cooks re move cakes layer-cake pans will free fiberglass form Some slight temporary stretching may oc cur Saran Wrap may displaced partially Repeat process until fiberglass crankcase can pulled form author has omitted ba sic details easy-does-it method cause has published Hobby poxy other detailed published articles following comments will assist decision making emphasize certain important details Three layers glass cloth good coatings Hobbypoxy II will make light crankcase five layers glass cloth starting medium weight finishing light weight glass cloth would better Smoother thinner coatings epoxy can applied epoxy kept warm during ap plication means small hair dryer Bubbles can excluded careful ap plication under warm conditions worry about bubblessince mar surface can opened filled later show painted Care should taken prevent roundoff flats crankcase provided mounting engine cylinders can accomplished taping layer foam rubber over deflated balloon press evenly completely around section having flats epoxy hardens use rubber bands re tain foam rubber because will localize pressure too much per manently indent fiberglass Masking tape works well hold foam rubber place engine cowling form made us ing layers scrap plastic foam shaped a sheets laminated front back serve templates prevent distortion rounding front back corners under pressure holding dowel built form After form shaped size author used US Gypsum Top Coat mixed water fill pores plastic foam blend shape form almost dry hard form completely sanded Top Coat easily sanded very rough fully hard ened possible sand easily very slight amount moisture still remains just prior final hardening Top Coat can better job less ex pense compared use filler coating made Tite Bond cement Commercially Top Coat used pre pared wall surfaces cover nail indenta tions joints finish coat can made very smooth Used plastic foam surface strong coating insulates protects plastic foam damage hot air used soften smooth epoxy coating need very thick thinner ap plications preferred reduce number coatings have applied take care shrinkage can occur thick sections Waxing form recommended since Saran Wrap can applied easily shrunk very neatly form After fiberglass work completed flexible palette knife used previously explained help re move cowling damage either cowling form author tried success locally procure balloons large enough easy-does-it method making engine cowling Jumbo-size 16 diameter balloons procured quite big enough cowl ing Therefore usual amount sanding necessary smooth finish word caution attempt ing use easy-does-it method Secure glass cloth well thumb tacks areas cut away prevent shifting due balloon breakage slippage Bal loons little too small may go onto form slip back off again especially back turned doing position loose fiber glass cloth will shifted Following rule thumb balloon least twice big form usually helps prevent trouble sloping shape engine cowling encouraged slippage balloons glance landing gear may tend make potential builder have second thoughts author confesses item did delay start project Happily landing gear came out right first time very little extra effort using four single pieces i/i diam eter piano wire finished product Since landing gear has 12 strut members wire simulates several struts order conserve building time piano wire author played around coat hanger wire develop side gear though calculated angles bends lengths struts paid attention lengths bent wire fit mount ing attach points soft pat tern wires correctly shaped pieces piano wire bent exactly same way Having completed side opposite side gear bent soft wire reversing bends required pieces piano wire bent duplicate side small vise mark ing Kodak negative pencil authors preference pair abrasive cut-off discsmounted arbor chuck Dremel toolwere tools used work piano wire coat hanger wire initially straightened first strut length marked wire allowance bend Having made bend next strut length marked wire al lowance bend process repeated until bends made adjusted meet attach points same procedure used piano wire using soft wire pattern visu al guide During design landing gear noted torsional restraint could utilized strengthen gear rather relying resistance bending alone done use grooved maple landing gear block Top Flite firmly af fixed screws epoxy back bottom edge plywood firewall Also using two other separate pieces short lengths grooved maple blocks tached points provided immediately front leading edge bottom wing front side plywood bulk head number 2 use mounting attach points piano wire started axle bent angle up toward middle firewall mounting block bent lay groove reverse direction exit same side turned up slightly inverted N bent side fuselage bulkhead number 2 Straps screws hold torsional portion groove after wire end plugged side fuselage hard wood separator block shown drawing attached landing gear block prevent shift torsional sections toward middle slipping groove under holding straps second piece wire formed attach rearward cowling near top longeron fuselage bent downward include Oleo strut bent under axle back under lower wing attach near center bottom fuselage rear trailing edge left right upper ends attach through individual Nylon brackets cut single CG Nylon nose-gear bracket bolted back plywood firewall ends held wheel collars rearward ends bent right angles inserted holes drilled 94 Model Aviation SCALE CLASICS Plans & Construction Manual CURTISS HAWK POESTINSON RELIANT BRO V Scale 945 Span S220 V Scale 126 Spat250 2Scale 63 Span S12 2Scale 84Span1500 11tSoale 47VoSpan 1000 l0Soela 63 Span$1260 CURTISS GOSHAWK FIlCO 2 Scale 63 SpanS1S~ CURTISS GULFHAWK lA . 2Soale 63 Span 51600 Scale 94 5pa 63000 Peaee Add 6160 P 040 Foetag sod 0e,dllog. OutSide US Add $300Make alt PSymeete Richard G Barron1213 Holly Spring Ln Grand Blanc MichIgan 48439 Seed Slos Complete toomatlen INSTALL AfidUun FUEL TANK ITS GOOD TO KNOW ITS IN THERE FULL TANK SYSTEM Modelers agree Sullivan has put gether k thats really can now fill tank top bubble allows enough room air tubing fitting neatly inside bubble tanks except smaller 4 oz clude Klapper-Klunk stiff-arm klunk klunk pick-ups se own system NEV-R-LEAK fuel tanks have standard favorite years Made better bubble-top FULL TANK SYSTEM now ll become tanks youll ever want use rectangular piece Epoxy printed cir cuit board attached bottom center area lower wing mounting block notched Nylon strap bolted under through lower wing constrains ends wire holes Epoxy mounting plate Attachment wire looped under axle axle itself matter personal preference author preferring use binding wire sol der made pair aluminum parts Nylon other materials could used instead point counts number bends wires will find number equal little wire gears affix back fire wall due number bends required prevent displacement firewall gear stronger construction others made size wire side tripod struts attaches top Oleo strut Oleo strut together two lower struts likewise forms tripod attaching wheel hub Application dope can expedited using 3-in cubes Polyurethane instead brush Use small aluminum pan margarine container hold dope Soak about dope side cube apply covering slight pressure will feed dope side pores cube reducing drag stroke However first coat silk cube should held off instant encourage slight dryness lightly touched silk ap ply too much dope cause runs Since weight especially tail has detri mental effect flying quality apply minimum amount dopein particular heavier color dope Experience indicated 20 right 20 down thrust would good first ap proximation angles needed straight level flight Offsets base engine mount about 5/32 inch can used bring propeller shaft center cowling better appear ance however should borne mind also offsets engine thrust line will decrease thrust correction angles required angles offsets desired together 20 positive set ting stabilizer should set first test flight Under conditions takeoff flight should accomplished less panic greater safety Hope fully trim adjustments will within limits trim available transmitter Any thought engine mount could machined thrust correction discarded found 148 inch would have removed measured point edge slanted 450 axis vertical 3-in diameter engine mount base Therefore large wedgeshaped aluminum shim form annulus ring washer made drilled provide mounting holes required engine mount installation Fig provides scientific accurate way determining specs making such aluminum wedge suggested 3/16 thick alumi num sheet stock used machining circular wedge shim Machine shim scribe position axis drill mounting holes type shim will produce firmest engine mount support Wing strut landing gear strut angles lengths can calculated similarly using compound angle formulas Simplest way visualize problem draw pyramid corner edge perpen dicular arectangular base longest edge representing strut question perpendicular distance tween attach points bends coordinates base can obtained original drawings accordance scale Projected angles can measured directly drawings unaffected scale Formulas type calculation listed Mechanics Vest Pocket Reference Book full explanation compound angles contained Practical Shop Mathemat ics Vol No 2 J H Wolfe E R Phelps McGraw-Hill After having prepared description good method use applying dope especially silk winter arrived odor dope would have offen sive Coverite applied word February 1 979 95 A Enough space air bubble B Fill tank top C Tube goes up air bubble 12-INCH LENGTH OFSULLI-CONETUBING FREE WITH EVERYTANK ATYPICAL ELEVAT/RuOOER INSlALLATION -xxxx 7G&PLIiIIiNGE COONEY * EASY INSTALLATION * NO AR GAP * FREE MOVEMENT * STRONG AND LIGHTWEIGHT MPLETELY FUELPROOF * COMPATIBLE WITH ALL IRON-ON COVERINGS FOURMOST RACING PRODU CTS 24th Avenue caution black color Coverite used tended bleed yellow Cover ite insignia trim Glaskote later used seal lettering would have prevented color bleeding painted contact surface prior trimming final installation assembly methods devised retaining fuel tank installing muffler providing good looking landing light lens First found square 12ounce Sullivan fuel tank fits nicely quart size cardboard milk carton simple matter cut position hold container place bulkhead #2 flat pieces apple taffy sticks important make installation removable access servos Another good way make engine bulkhead removable firewall complete engine fuel tank Secondly Slim Line Muffler fine engine installation should modified install right angles Beside looking much better muffler can re main engine during assembly removal cowling Viewed side modified muffler appears position imitates air inlet dummy engine Thirdly very realistic looking lens landing lights can made about five minutes Simply acquire pair plastic egg containers wife girl friend has purchased two pair Leggs panty hose Use largest end egg scribe required diameter circle inside spinning small compass Using pair scissors cut crack ing inscribed circle Attach lenses landing lights Pliobond cement record landing lights black dress up piano wire landing gear decided use large size straight plastic soda straws Short pieces black neoprene tubing Sullivan split snapped around wire concentrically space ends split plastic soda straws conceal split straws two concentric straws used splits oriented 1800 apart wire outside split can covered TYPICAL AILERO*J1NSTA L-A ON xX-x 35 length invisible Scotch tape fore after painting Likewise ends can retained wrap same tape Tests proved tape could doped fact dope will stay tape little loss gloss whereas dope may tend flake off smooth plastic straws flexed Sanding straws lightly roughen surface helps flight straws fly off Since Olco struts larger decided use cut off plastic barrel sec tions black felt pens sections pens split lengthwise means Xacto saw snapped over piano wire Concentric spacing accomplished build-up split neoprene tubing Axial shift pieces pens prevented Goo cement rubber like modelers cement author also applies prevent wheel colars com ing off etc preparation flying landing lights scale engine cowl re moved pair 3-in diameter wheels 13-5 propeller installed model balanced 12 ounces lead two 6 ounce sinkers engine mount moved CG forward about 30% location general everything done compen sate unwanted torque effects assure model would fly tail heavy Now happiest reward ing part test flights prototype Frank Stanton friend fellow club member agreed serve test pilot club field Johnsville NADC Warminster PA first check flight complete success Indications less ballast could have used trim adjustments required 50% left rudder trim 100% up elevator trim means transmitter trim ad justments airplane flew well trim changes surfaces second flight became stunt flight Would believe Frank flew large portion rolling circle Barring low sun position Frank probably would have gone way around Allowing fact model being flown very capable flier observers noted excellent manner Pitcairn Mailwing responded flight After test flights Franks comments Its good flying airplane Its piece cake fly next flying session Pitcairn Mailwing flown dressed-up inflight pictures time ballast weight reduced about 8 ounces Two flights flown shoot takeoff fly-by landing pictures surpris ing model did roll fast cause ailerons lower wing no differential utilized Aileron turns good turns made using rudder resulted loss al titude unusual Indications smooth grass fly ing fields would preferable hard sur face runways agreement ground handling original airplane flown landing lights scale engine cowl configuration tends protect damage should ground loop occur propeller sur vived two ground loops hard runways final note author has recently purchased Giant Round Balloons made Mexico distributed through World Toy House balloons look very promising use making large en gine cowls easy-does-it method course modelers should overlook possibility obtaining suitable balloons Hobbypoxy people origi nated method RC Aerobatics/Van Putte continued page 28 does guarantee Novice pattern tro phy enough good fliers around have make very difficult great flier win sport airplane several ways proceed al leviating situation have pitfalls will probably take grass roots movement have much effect pattern flying since major changes rules very infrequent unless widespread demonstration need desire change Contest Di rectors will have make decisions offer competition line proposed rule changes see work out National Society Radio Controlled Aerobatics NS RCA can strong fac tor proposed rule changes NSRCA district vice presidents should given feedback proposed changes issues can aired K Factor monthly newsletter NSRCA arent already NSRCA member send $10 1979 dues Mrs Sally Brown Secretary Treasurer 8534 Huddleston Drive Cincinnati OH 45236 thing has tried Con test Directors contests around coun try has introduction special Novice class beginners pattern com petition large contests have 96 Model Aviation LARGESMALL fit saafoces 1/8 thicker
Edition: Model Aviation - 1979/02
Page Numbers: 16, 17, 18, 19, 20, 21, 22, 23, 92, 94, 95, 96
NO OCR TEXT 4 have re will pose maximum ced 45 pounds p ai ed Ltuyin ce md 35 air time Cha I/16X ALL RIBS L F RC NO OCR TEXT LONOING LIGHTCGT-OLIT 2 REQUIRED lODE WING PLUS FOR POSITION REDUCE ROROER TO FLAT OURFACE I/WIG OR PLYWOOD INSERT OIOL MODIDTEO LANDING REAR SUPPORT BRACKET 0 REGOELEVATORDRONE SERVO MATE FROM NYLON NOSE WHEEL MOUNTINGERVSTIPS-lO SHOWN THROTTLE POSH ROD CA THROST OFFSET LI L 403 RDRGLSA7fl FORMER N 1 4Sg O~lL ERAFYHECI ~1 1 V ROSOER IV SERVO II ID INCH IIIII BELLCRANE KiL4Lii- Th---- hR SHEET WULSA TEMPORARY MOLDING RHUCE FORMER 3 IN 3G Ill I I I/ID SHEET HARDWOOD LANDING GEARI HOLWITING RLOCIS NOTE MOUNT ENLUNE 8TH ST DOWN THRUST DM0 ST RIGHT THRUST SIDE VIEW ODES NOT GROW ANT DOWN THRUST CANT FRONT OF TGWLWG TO AGREE WITH ANGLES SF TRRSSY OFFSET NOTE OGRE LONER PORTION SF FORMERS-S4 U T 8 FROM I/RD I/O DOLOR INST 511/WE OR TEMPLATESTG /8 BALSA FORMER 7OR SHEETFORMER S3132530R BALSA RALOG 3/3251/4 BALSA UTTUER OGRARE STRUTS ST FGSELAGE OSING HARDFORMERS WOOD SPACERD 0415 FRONTFORMER-U C 3/KIN HEGH___________G ALOD HEADREST /30 PLYWOUDWINDSHIELD COWLING I/lU PLYWOOD WING SADOL SPLIT IWOPREIWIGOERYG 2 EACH SIDE IGOFT FOAMREADTURING EGO/HO I]-iPOOHEDGING REMO5E RGLSUIIERHFT INSERT VWRL-Y -DECI WOOD POW I -- I/IN WALGA- ARA5STRUTG -I- L VEPRESENTATISE CYLINDERSGRFACE TO SGRFUCE___________ CRUNREADE IN LOWLINS FORUS CALCULATED___________ BRADY WHIRLWIND 15RUTTERY BOG SCALE ENGINE YfFIAIYD,STS/REII SCALE PROPELLER SIZE- lAO/H DIG/ HP Al FRE ENGINE GROWN 2ROLES FOR 3/KIND3/RG3/R TRIUNGULUR WING MOUNTING DOWELS3/H D3/R MUPLEDALSA INDIDE WING MOGNYING CROSS MEMHERI/IN EPOXY PC ROGRO I-OR LONG CALCULATEDG1I-I/U WIDE DRILL 2 HOLES hR GIG CS1/4 D3/RGI/ID NYLDN MLOCD3/H E TO G POD LANDING DEAR NOTCH I/W DEEP WITH S/H GIRDING DALL AT CENTER FOR RHDEREK K 2j 4 EDIA25/30 HER THICKNESSICC NOTE IWSDE MEGODREMENTT-GRTO DUD II /R#35 OIHLL 030 NOTE 2 STERPLANE WING STRUTS CALCULATED RR2 ISSURFACE TO OSREUCE DYRAL 3/H WIDE TEE ATTUCH POINTS OR WINGS / -S/FOR MER-2 I/A PLYWOOD 04 ALAATTERY DOD 0 OGGO 5/HG VH RADIO SHAdS MINI ROGMSDIFIEO SR DELLERUNK OH AL U CHANNEL I/A WIDE MADE FROM MINFROG SCRAP AL GOD 3/H MAPLE GEFOET SPACER H VA AL S/IN WIDE LENOTH TOSGIT REODIRED CONTROL HORDE BOLT SIDE BY SIDE TO HELLERORN GRILL POR DOD JACK SHAFT SPREE WITH REVLON TURES TOP NOTE WIRE NO3 OGII34ZIGLO FRUTAT SlEW 4/HOV SAYLOR CLEFIG STRUT FITTINGTHRI/ST ASIS ID REQUIRED N 0 0 5 IEM GSLE-i4,MOTTOM OR S PIANO WIRE -I I/A PlYWOOD FACRO SPUD SIGESOHI F BRACE 1 ANGLE EACH END LANDIBO ACAR BOLT FRILL S/IA U FR RAROWOOS INSERTWERBNR B-US SIDE P1501 NERDE FR I/S SALT RUSSIAROFRA FOR STRUT MB-B LOWER WINS BOLTALERIS1 PUSH ROE ALE LOCATIONS/ / IIII 3/ASIA RAROWOOG UTWELS MARE TAO UPPROS 2 IN ION 2/A NULGA SHAPE TO AIRFOIL II~ii /II LOWER WING 3/BUS/B BALSA UPPER WINO test hop builwntnrustl e fuselage blackin quart iling npound angle andMuseum utas derived DC o axis y 9 degrnon Airport Virginia West urn M engine mourn Ige new axis Y tan B e ie cc FIRE example using ved formulas nc Tables thrust C4 e ptnuary 1959 Amer II 1960 Air ing o ar bracinp lower br ously Pu ueI th nt model like mi Chief E ailerons ne lower ng UI isnodels t moving downwar neutral aft th move OSI1I ood way c d yaw Sta Openers/Winter continued page 4 cloaks clock-watchers see some hearts can saddened Like TVs Dangerfield dont get no respect see irony power center AMA Washington Un der by-laws membership elects district vice presidents also Council members Almost far away states caliber people testifies judgment members elected themthey capable As group meet four times year deal best abil ities matters before qualifications businessmen pri vate life impeccable dont defend perfect expected anyone human being perhaps feel no defense FO needed welcome Perhaps make mistakes cannot say Perhaps timing things always brilliant devious calculating po lit icalthey modelers serving volun tarily know believe what decide motivated what feel best Sometimes means Executive Director minority Council meeting happens right Council charge no governmental agency-type Secre tary Washington can Big Brother us what FO about say could receive pink slip simply Recent actions have taken place done some us may drop wayside awhile will go growing Council hear message members call out proceed caution lay out new programs added expenses things members think AMA should Most members above dues increase less cost next weeks fuel buy other magazine almost much AMA asks magazine insurance other benefits others among us ask Should go response few people have ad dressed editor let us keep cool Dues increases however necessary brew negative reactionsnobody willingly ac cepts higher prices cant let ex perts confuse us individual mem bers can make own assessments finally patient readers may say Fine youAMA pays salary answer simply should hope can well other ways like old warhorse FO likes sniff battlefield challenge improve magazine see firmly its way mem bership tool par excellance help AMA grow prosper right know way words used discussion parody Supreme Court deci sions meaning Should everyones cor respondence AMA headquarters plastered billboard present instance publications demand AMA print letter critique logically based upon imagined need shed light some secretive wrong doing AMA has asked account pa per clips sugar cubes etc broken down AMA use Model Aviation use true joke think Watergate Deep Throat Will Judge Jaworski appear doorway Enough already Speaking rights almost 50000 people wanted paid Model Aviation 1978 have Can two critics seriously think people great majority Open mem bers can denied what prefer troubled FO offers words late President Jack Kennedy great enemy truth very ten liedeliberate contrived dishonest mythpersistent persuasive unrealistic Too often hold fast cliches fore-bear ers subject facts prefabricat ed set interpretations enjoy comfort opinion discom fort thought Greatest Show/Howard continued page 13 tions booth several years draws lots interest spec tators AMA represented president Johnny Clemens Larry Bolich special events director Earl Witt secretary-treasurer AMA always very responsive type public exposure could go on about fun fellowship fliers enjoy show photos show much words can tell can see Flying Circus future make plans participate Enjoy hobby Pitcairn/Stott continued page 23 per wing span would have 66 inches An increase over 4 inches upper wing span would have made assembled model airplane too large placed back seat automobile scale model designer builder must decide detailed scale model should decision involves consideration available material time money shop equipment desired usage ability Now Sport Scale Stand-Off Scale gaining popular ity over true scale choice has broadened authors decisions largely compromise based desire fun fly moderately windy weather possibly enter contest requiring exact scale Although model deviates scale selection airfoil slightly larger engine scale plans show true outline except previously noted realistic appearance slightly over-size 2 inch ot Williams Wright Whirlwind J5 installed way largely conceal inverted 60 engine Further streamlining camouflaging engine accomplished fiber glass cowling provide much space around engine possible muffler permit installation battery pack under cowling desired help establish correct CG location resorting- excess dead weight balance common practice remove scalelike engines routine test flights necessary substitute equivalent weight prevent shift CG reason fiberglass cowl engine crankcase formed separate molded parts crankcase form made hard balsa previously used packing crating because its weight balsa cut discs laminated before shaping size During machining observed form tended turn out round lathe due end grain cutting same other grain directions Care taken bring form back round hand work Finally form fitted -in diameter wood-holding dowel centrally located extend axially out back dowel can supported easily vise applying fiber glass No attempt made provide draft taper form diameters since believed fiberglass crank case would have cut form anyway pleasant sur prise easy-does-it method completed fiberglass crankcase removed piece damage either crankcase form method removal follows I Remove thumb tacks held Saran Wrap glass cloth place being coated Hobbypoxy II during placement balloon cover lay-up 2 Trim fiberglass rear outer di ameter assure no fiberglass locks around back corner form rough out front open hole fiber glass cowl removing excess cut away extract thumb tacks operations easier fiber glass has cured two three hours has completely hardened 3 Insert artists flexible palette knife rear form under fiberglass Saran Wrap Japa nese artist paint mixing knife used 92 Model Aviation author 3-in flexible blade tapered thickness 014 inch tip 028 inch handle Also sides knife slightly tapered tip bent upward almost im perceptible amount Slide knife axi ally along surface work 3600 around formthe same way cooks re move cakes layer-cake pans will free fiberglass form Some slight temporary stretching may oc cur Saran Wrap may displaced partially Repeat process until fiberglass crankcase can pulled form author has omitted ba sic details easy-does-it method cause has published Hobby poxy other detailed published articles following comments will assist decision making emphasize certain important details Three layers glass cloth good coatings Hobbypoxy II will make light crankcase five layers glass cloth starting medium weight finishing light weight glass cloth would better Smoother thinner coatings epoxy can applied epoxy kept warm during ap plication means small hair dryer Bubbles can excluded careful ap plication under warm conditions worry about bubblessince mar surface can opened filled later show painted Care should taken prevent roundoff flats crankcase provided mounting engine cylinders can accomplished taping layer foam rubber over deflated balloon press evenly completely around section having flats epoxy hardens use rubber bands re tain foam rubber because will localize pressure too much per manently indent fiberglass Masking tape works well hold foam rubber place engine cowling form made us ing layers scrap plastic foam shaped a sheets laminated front back serve templates prevent distortion rounding front back corners under pressure holding dowel built form After form shaped size author used US Gypsum Top Coat mixed water fill pores plastic foam blend shape form almost dry hard form completely sanded Top Coat easily sanded very rough fully hard ened possible sand easily very slight amount moisture still remains just prior final hardening Top Coat can better job less ex pense compared use filler coating made Tite Bond cement Commercially Top Coat used pre pared wall surfaces cover nail indenta tions joints finish coat can made very smooth Used plastic foam surface strong coating insulates protects plastic foam damage hot air used soften smooth epoxy coating need very thick thinner ap plications preferred reduce number coatings have applied take care shrinkage can occur thick sections Waxing form recommended since Saran Wrap can applied easily shrunk very neatly form After fiberglass work completed flexible palette knife used previously explained help re move cowling damage either cowling form author tried success locally procure balloons large enough easy-does-it method making engine cowling Jumbo-size 16 diameter balloons procured quite big enough cowl ing Therefore usual amount sanding necessary smooth finish word caution attempt ing use easy-does-it method Secure glass cloth well thumb tacks areas cut away prevent shifting due balloon breakage slippage Bal loons little too small may go onto form slip back off again especially back turned doing position loose fiber glass cloth will shifted Following rule thumb balloon least twice big form usually helps prevent trouble sloping shape engine cowling encouraged slippage balloons glance landing gear may tend make potential builder have second thoughts author confesses item did delay start project Happily landing gear came out right first time very little extra effort using four single pieces i/i diam eter piano wire finished product Since landing gear has 12 strut members wire simulates several struts order conserve building time piano wire author played around coat hanger wire develop side gear though calculated angles bends lengths struts paid attention lengths bent wire fit mount ing attach points soft pat tern wires correctly shaped pieces piano wire bent exactly same way Having completed side opposite side gear bent soft wire reversing bends required pieces piano wire bent duplicate side small vise mark ing Kodak negative pencil authors preference pair abrasive cut-off discsmounted arbor chuck Dremel toolwere tools used work piano wire coat hanger wire initially straightened first strut length marked wire allowance bend Having made bend next strut length marked wire al lowance bend process repeated until bends made adjusted meet attach points same procedure used piano wire using soft wire pattern visu al guide During design landing gear noted torsional restraint could utilized strengthen gear rather relying resistance bending alone done use grooved maple landing gear block Top Flite firmly af fixed screws epoxy back bottom edge plywood firewall Also using two other separate pieces short lengths grooved maple blocks tached points provided immediately front leading edge bottom wing front side plywood bulk head number 2 use mounting attach points piano wire started axle bent angle up toward middle firewall mounting block bent lay groove reverse direction exit same side turned up slightly inverted N bent side fuselage bulkhead number 2 Straps screws hold torsional portion groove after wire end plugged side fuselage hard wood separator block shown drawing attached landing gear block prevent shift torsional sections toward middle slipping groove under holding straps second piece wire formed attach rearward cowling near top longeron fuselage bent downward include Oleo strut bent under axle back under lower wing attach near center bottom fuselage rear trailing edge left right upper ends attach through individual Nylon brackets cut single CG Nylon nose-gear bracket bolted back plywood firewall ends held wheel collars rearward ends bent right angles inserted holes drilled 94 Model Aviation SCALE CLASICS Plans & Construction Manual CURTISS HAWK POESTINSON RELIANT BRO V Scale 945 Span S220 V Scale 126 Spat250 2Scale 63 Span S12 2Scale 84Span1500 11tSoale 47VoSpan 1000 l0Soela 63 Span$1260 CURTISS GOSHAWK FIlCO 2 Scale 63 SpanS1S~ CURTISS GULFHAWK lA . 2Soale 63 Span 51600 Scale 94 5pa 63000 Peaee Add 6160 P 040 Foetag sod 0e,dllog. OutSide US Add $300Make alt PSymeete Richard G Barron1213 Holly Spring Ln Grand Blanc MichIgan 48439 Seed Slos Complete toomatlen INSTALL AfidUun FUEL TANK ITS GOOD TO KNOW ITS IN THERE FULL TANK SYSTEM Modelers agree Sullivan has put gether k thats really can now fill tank top bubble allows enough room air tubing fitting neatly inside bubble tanks except smaller 4 oz clude Klapper-Klunk stiff-arm klunk klunk pick-ups se own system NEV-R-LEAK fuel tanks have standard favorite years Made better bubble-top FULL TANK SYSTEM now ll become tanks youll ever want use rectangular piece Epoxy printed cir cuit board attached bottom center area lower wing mounting block notched Nylon strap bolted under through lower wing constrains ends wire holes Epoxy mounting plate Attachment wire looped under axle axle itself matter personal preference author preferring use binding wire sol der made pair aluminum parts Nylon other materials could used instead point counts number bends wires will find number equal little wire gears affix back fire wall due number bends required prevent displacement firewall gear stronger construction others made size wire side tripod struts attaches top Oleo strut Oleo strut together two lower struts likewise forms tripod attaching wheel hub Application dope can expedited using 3-in cubes Polyurethane instead brush Use small aluminum pan margarine container hold dope Soak about dope side cube apply covering slight pressure will feed dope side pores cube reducing drag stroke However first coat silk cube should held off instant encourage slight dryness lightly touched silk ap ply too much dope cause runs Since weight especially tail has detri mental effect flying quality apply minimum amount dopein particular heavier color dope Experience indicated 20 right 20 down thrust would good first ap proximation angles needed straight level flight Offsets base engine mount about 5/32 inch can used bring propeller shaft center cowling better appear ance however should borne mind also offsets engine thrust line will decrease thrust correction angles required angles offsets desired together 20 positive set ting stabilizer should set first test flight Under conditions takeoff flight should accomplished less panic greater safety Hope fully trim adjustments will within limits trim available transmitter Any thought engine mount could machined thrust correction discarded found 148 inch would have removed measured point edge slanted 450 axis vertical 3-in diameter engine mount base Therefore large wedgeshaped aluminum shim form annulus ring washer made drilled provide mounting holes required engine mount installation Fig provides scientific accurate way determining specs making such aluminum wedge suggested 3/16 thick alumi num sheet stock used machining circular wedge shim Machine shim scribe position axis drill mounting holes type shim will produce firmest engine mount support Wing strut landing gear strut angles lengths can calculated similarly using compound angle formulas Simplest way visualize problem draw pyramid corner edge perpen dicular arectangular base longest edge representing strut question perpendicular distance tween attach points bends coordinates base can obtained original drawings accordance scale Projected angles can measured directly drawings unaffected scale Formulas type calculation listed Mechanics Vest Pocket Reference Book full explanation compound angles contained Practical Shop Mathemat ics Vol No 2 J H Wolfe E R Phelps McGraw-Hill After having prepared description good method use applying dope especially silk winter arrived odor dope would have offen sive Coverite applied word February 1 979 95 A Enough space air bubble B Fill tank top C Tube goes up air bubble 12-INCH LENGTH OFSULLI-CONETUBING FREE WITH EVERYTANK ATYPICAL ELEVAT/RuOOER INSlALLATION -xxxx 7G&PLIiIIiNGE COONEY * EASY INSTALLATION * NO AR GAP * FREE MOVEMENT * STRONG AND LIGHTWEIGHT MPLETELY FUELPROOF * COMPATIBLE WITH ALL IRON-ON COVERINGS FOURMOST RACING PRODU CTS 24th Avenue caution black color Coverite used tended bleed yellow Cover ite insignia trim Glaskote later used seal lettering would have prevented color bleeding painted contact surface prior trimming final installation assembly methods devised retaining fuel tank installing muffler providing good looking landing light lens First found square 12ounce Sullivan fuel tank fits nicely quart size cardboard milk carton simple matter cut position hold container place bulkhead #2 flat pieces apple taffy sticks important make installation removable access servos Another good way make engine bulkhead removable firewall complete engine fuel tank Secondly Slim Line Muffler fine engine installation should modified install right angles Beside looking much better muffler can re main engine during assembly removal cowling Viewed side modified muffler appears position imitates air inlet dummy engine Thirdly very realistic looking lens landing lights can made about five minutes Simply acquire pair plastic egg containers wife girl friend has purchased two pair Leggs panty hose Use largest end egg scribe required diameter circle inside spinning small compass Using pair scissors cut crack ing inscribed circle Attach lenses landing lights Pliobond cement record landing lights black dress up piano wire landing gear decided use large size straight plastic soda straws Short pieces black neoprene tubing Sullivan split snapped around wire concentrically space ends split plastic soda straws conceal split straws two concentric straws used splits oriented 1800 apart wire outside split can covered TYPICAL AILERO*J1NSTA L-A ON xX-x 35 length invisible Scotch tape fore after painting Likewise ends can retained wrap same tape Tests proved tape could doped fact dope will stay tape little loss gloss whereas dope may tend flake off smooth plastic straws flexed Sanding straws lightly roughen surface helps flight straws fly off Since Olco struts larger decided use cut off plastic barrel sec tions black felt pens sections pens split lengthwise means Xacto saw snapped over piano wire Concentric spacing accomplished build-up split neoprene tubing Axial shift pieces pens prevented Goo cement rubber like modelers cement author also applies prevent wheel colars com ing off etc preparation flying landing lights scale engine cowl re moved pair 3-in diameter wheels 13-5 propeller installed model balanced 12 ounces lead two 6 ounce sinkers engine mount moved CG forward about 30% location general everything done compen sate unwanted torque effects assure model would fly tail heavy Now happiest reward ing part test flights prototype Frank Stanton friend fellow club member agreed serve test pilot club field Johnsville NADC Warminster PA first check flight complete success Indications less ballast could have used trim adjustments required 50% left rudder trim 100% up elevator trim means transmitter trim ad justments airplane flew well trim changes surfaces second flight became stunt flight Would believe Frank flew large portion rolling circle Barring low sun position Frank probably would have gone way around Allowing fact model being flown very capable flier observers noted excellent manner Pitcairn Mailwing responded flight After test flights Franks comments Its good flying airplane Its piece cake fly next flying session Pitcairn Mailwing flown dressed-up inflight pictures time ballast weight reduced about 8 ounces Two flights flown shoot takeoff fly-by landing pictures surpris ing model did roll fast cause ailerons lower wing no differential utilized Aileron turns good turns made using rudder resulted loss al titude unusual Indications smooth grass fly ing fields would preferable hard sur face runways agreement ground handling original airplane flown landing lights scale engine cowl configuration tends protect damage should ground loop occur propeller sur vived two ground loops hard runways final note author has recently purchased Giant Round Balloons made Mexico distributed through World Toy House balloons look very promising use making large en gine cowls easy-does-it method course modelers should overlook possibility obtaining suitable balloons Hobbypoxy people origi nated method RC Aerobatics/Van Putte continued page 28 does guarantee Novice pattern tro phy enough good fliers around have make very difficult great flier win sport airplane several ways proceed al leviating situation have pitfalls will probably take grass roots movement have much effect pattern flying since major changes rules very infrequent unless widespread demonstration need desire change Contest Di rectors will have make decisions offer competition line proposed rule changes see work out National Society Radio Controlled Aerobatics NS RCA can strong fac tor proposed rule changes NSRCA district vice presidents should given feedback proposed changes issues can aired K Factor monthly newsletter NSRCA arent already NSRCA member send $10 1979 dues Mrs Sally Brown Secretary Treasurer 8534 Huddleston Drive Cincinnati OH 45236 thing has tried Con test Directors contests around coun try has introduction special Novice class beginners pattern com petition large contests have 96 Model Aviation LARGESMALL fit saafoces 1/8 thicker
Edition: Model Aviation - 1979/02
Page Numbers: 16, 17, 18, 19, 20, 21, 22, 23, 92, 94, 95, 96
NO OCR TEXT 4 have re will pose maximum ced 45 pounds p ai ed Ltuyin ce md 35 air time Cha I/16X ALL RIBS L F RC NO OCR TEXT LONOING LIGHTCGT-OLIT 2 REQUIRED lODE WING PLUS FOR POSITION REDUCE ROROER TO FLAT OURFACE I/WIG OR PLYWOOD INSERT OIOL MODIDTEO LANDING REAR SUPPORT BRACKET 0 REGOELEVATORDRONE SERVO MATE FROM NYLON NOSE WHEEL MOUNTINGERVSTIPS-lO SHOWN THROTTLE POSH ROD CA THROST OFFSET LI L 403 RDRGLSA7fl FORMER N 1 4Sg O~lL ERAFYHECI ~1 1 V ROSOER IV SERVO II ID INCH IIIII BELLCRANE KiL4Lii- Th---- hR SHEET WULSA TEMPORARY MOLDING RHUCE FORMER 3 IN 3G Ill I I I/ID SHEET HARDWOOD LANDING GEARI HOLWITING RLOCIS NOTE MOUNT ENLUNE 8TH ST DOWN THRUST DM0 ST RIGHT THRUST SIDE VIEW ODES NOT GROW ANT DOWN THRUST CANT FRONT OF TGWLWG TO AGREE WITH ANGLES SF TRRSSY OFFSET NOTE OGRE LONER PORTION SF FORMERS-S4 U T 8 FROM I/RD I/O DOLOR INST 511/WE OR TEMPLATESTG /8 BALSA FORMER 7OR SHEETFORMER S3132530R BALSA RALOG 3/3251/4 BALSA UTTUER OGRARE STRUTS ST FGSELAGE OSING HARDFORMERS WOOD SPACERD 0415 FRONTFORMER-U C 3/KIN HEGH___________G ALOD HEADREST /30 PLYWOUDWINDSHIELD COWLING I/lU PLYWOOD WING SADOL SPLIT IWOPREIWIGOERYG 2 EACH SIDE IGOFT FOAMREADTURING EGO/HO I]-iPOOHEDGING REMO5E RGLSUIIERHFT INSERT VWRL-Y -DECI WOOD POW I -- I/IN WALGA- ARA5STRUTG -I- L VEPRESENTATISE CYLINDERSGRFACE TO SGRFUCE___________ CRUNREADE IN LOWLINS FORUS CALCULATED___________ BRADY WHIRLWIND 15RUTTERY BOG SCALE ENGINE YfFIAIYD,STS/REII SCALE PROPELLER SIZE- lAO/H DIG/ HP Al FRE ENGINE GROWN 2ROLES FOR 3/KIND3/RG3/R TRIUNGULUR WING MOUNTING DOWELS3/H D3/R MUPLEDALSA INDIDE WING MOGNYING CROSS MEMHERI/IN EPOXY PC ROGRO I-OR LONG CALCULATEDG1I-I/U WIDE DRILL 2 HOLES hR GIG CS1/4 D3/RGI/ID NYLDN MLOCD3/H E TO G POD LANDING DEAR NOTCH I/W DEEP WITH S/H GIRDING DALL AT CENTER FOR RHDEREK K 2j 4 EDIA25/30 HER THICKNESSICC NOTE IWSDE MEGODREMENTT-GRTO DUD II /R#35 OIHLL 030 NOTE 2 STERPLANE WING STRUTS CALCULATED RR2 ISSURFACE TO OSREUCE DYRAL 3/H WIDE TEE ATTUCH POINTS OR WINGS / -S/FOR MER-2 I/A PLYWOOD 04 ALAATTERY DOD 0 OGGO 5/HG VH RADIO SHAdS MINI ROGMSDIFIEO SR DELLERUNK OH AL U CHANNEL I/A WIDE MADE FROM MINFROG SCRAP AL GOD 3/H MAPLE GEFOET SPACER H VA AL S/IN WIDE LENOTH TOSGIT REODIRED CONTROL HORDE BOLT SIDE BY SIDE TO HELLERORN GRILL POR DOD JACK SHAFT SPREE WITH REVLON TURES TOP NOTE WIRE NO3 OGII34ZIGLO FRUTAT SlEW 4/HOV SAYLOR CLEFIG STRUT FITTINGTHRI/ST ASIS ID REQUIRED N 0 0 5 IEM GSLE-i4,MOTTOM OR S PIANO WIRE -I I/A PlYWOOD FACRO SPUD SIGESOHI F BRACE 1 ANGLE EACH END LANDIBO ACAR BOLT FRILL S/IA U FR RAROWOOS INSERTWERBNR B-US SIDE P1501 NERDE FR I/S SALT RUSSIAROFRA FOR STRUT MB-B LOWER WINS BOLTALERIS1 PUSH ROE ALE LOCATIONS/ / IIII 3/ASIA RAROWOOG UTWELS MARE TAO UPPROS 2 IN ION 2/A NULGA SHAPE TO AIRFOIL II~ii /II LOWER WING 3/BUS/B BALSA UPPER WINO test hop builwntnrustl e fuselage blackin quart iling npound angle andMuseum utas derived DC o axis y 9 degrnon Airport Virginia West urn M engine mourn Ige new axis Y tan B e ie cc FIRE example using ved formulas nc Tables thrust C4 e ptnuary 1959 Amer II 1960 Air ing o ar bracinp lower br ously Pu ueI th nt model like mi Chief E ailerons ne lower ng UI isnodels t moving downwar neutral aft th move OSI1I ood way c d yaw Sta Openers/Winter continued page 4 cloaks clock-watchers see some hearts can saddened Like TVs Dangerfield dont get no respect see irony power center AMA Washington Un der by-laws membership elects district vice presidents also Council members Almost far away states caliber people testifies judgment members elected themthey capable As group meet four times year deal best abil ities matters before qualifications businessmen pri vate life impeccable dont defend perfect expected anyone human being perhaps feel no defense FO needed welcome Perhaps make mistakes cannot say Perhaps timing things always brilliant devious calculating po lit icalthey modelers serving volun tarily know believe what decide motivated what feel best Sometimes means Executive Director minority Council meeting happens right Council charge no governmental agency-type Secre tary Washington can Big Brother us what FO about say could receive pink slip simply Recent actions have taken place done some us may drop wayside awhile will go growing Council hear message members call out proceed caution lay out new programs added expenses things members think AMA should Most members above dues increase less cost next weeks fuel buy other magazine almost much AMA asks magazine insurance other benefits others among us ask Should go response few people have ad dressed editor let us keep cool Dues increases however necessary brew negative reactionsnobody willingly ac cepts higher prices cant let ex perts confuse us individual mem bers can make own assessments finally patient readers may say Fine youAMA pays salary answer simply should hope can well other ways like old warhorse FO likes sniff battlefield challenge improve magazine see firmly its way mem bership tool par excellance help AMA grow prosper right know way words used discussion parody Supreme Court deci sions meaning Should everyones cor respondence AMA headquarters plastered billboard present instance publications demand AMA print letter critique logically based upon imagined need shed light some secretive wrong doing AMA has asked account pa per clips sugar cubes etc broken down AMA use Model Aviation use true joke think Watergate Deep Throat Will Judge Jaworski appear doorway Enough already Speaking rights almost 50000 people wanted paid Model Aviation 1978 have Can two critics seriously think people great majority Open mem bers can denied what prefer troubled FO offers words late President Jack Kennedy great enemy truth very ten liedeliberate contrived dishonest mythpersistent persuasive unrealistic Too often hold fast cliches fore-bear ers subject facts prefabricat ed set interpretations enjoy comfort opinion discom fort thought Greatest Show/Howard continued page 13 tions booth several years draws lots interest spec tators AMA represented president Johnny Clemens Larry Bolich special events director Earl Witt secretary-treasurer AMA always very responsive type public exposure could go on about fun fellowship fliers enjoy show photos show much words can tell can see Flying Circus future make plans participate Enjoy hobby Pitcairn/Stott continued page 23 per wing span would have 66 inches An increase over 4 inches upper wing span would have made assembled model airplane too large placed back seat automobile scale model designer builder must decide detailed scale model should decision involves consideration available material time money shop equipment desired usage ability Now Sport Scale Stand-Off Scale gaining popular ity over true scale choice has broadened authors decisions largely compromise based desire fun fly moderately windy weather possibly enter contest requiring exact scale Although model deviates scale selection airfoil slightly larger engine scale plans show true outline except previously noted realistic appearance slightly over-size 2 inch ot Williams Wright Whirlwind J5 installed way largely conceal inverted 60 engine Further streamlining camouflaging engine accomplished fiber glass cowling provide much space around engine possible muffler permit installation battery pack under cowling desired help establish correct CG location resorting- excess dead weight balance common practice remove scalelike engines routine test flights necessary substitute equivalent weight prevent shift CG reason fiberglass cowl engine crankcase formed separate molded parts crankcase form made hard balsa previously used packing crating because its weight balsa cut discs laminated before shaping size During machining observed form tended turn out round lathe due end grain cutting same other grain directions Care taken bring form back round hand work Finally form fitted -in diameter wood-holding dowel centrally located extend axially out back dowel can supported easily vise applying fiber glass No attempt made provide draft taper form diameters since believed fiberglass crank case would have cut form anyway pleasant sur prise easy-does-it method completed fiberglass crankcase removed piece damage either crankcase form method removal follows I Remove thumb tacks held Saran Wrap glass cloth place being coated Hobbypoxy II during placement balloon cover lay-up 2 Trim fiberglass rear outer di ameter assure no fiberglass locks around back corner form rough out front open hole fiber glass cowl removing excess cut away extract thumb tacks operations easier fiber glass has cured two three hours has completely hardened 3 Insert artists flexible palette knife rear form under fiberglass Saran Wrap Japa nese artist paint mixing knife used 92 Model Aviation author 3-in flexible blade tapered thickness 014 inch tip 028 inch handle Also sides knife slightly tapered tip bent upward almost im perceptible amount Slide knife axi ally along surface work 3600 around formthe same way cooks re move cakes layer-cake pans will free fiberglass form Some slight temporary stretching may oc cur Saran Wrap may displaced partially Repeat process until fiberglass crankcase can pulled form author has omitted ba sic details easy-does-it method cause has published Hobby poxy other detailed published articles following comments will assist decision making emphasize certain important details Three layers glass cloth good coatings Hobbypoxy II will make light crankcase five layers glass cloth starting medium weight finishing light weight glass cloth would better Smoother thinner coatings epoxy can applied epoxy kept warm during ap plication means small hair dryer Bubbles can excluded careful ap plication under warm conditions worry about bubblessince mar surface can opened filled later show painted Care should taken prevent roundoff flats crankcase provided mounting engine cylinders can accomplished taping layer foam rubber over deflated balloon press evenly completely around section having flats epoxy hardens use rubber bands re tain foam rubber because will localize pressure too much per manently indent fiberglass Masking tape works well hold foam rubber place engine cowling form made us ing layers scrap plastic foam shaped a sheets laminated front back serve templates prevent distortion rounding front back corners under pressure holding dowel built form After form shaped size author used US Gypsum Top Coat mixed water fill pores plastic foam blend shape form almost dry hard form completely sanded Top Coat easily sanded very rough fully hard ened possible sand easily very slight amount moisture still remains just prior final hardening Top Coat can better job less ex pense compared use filler coating made Tite Bond cement Commercially Top Coat used pre pared wall surfaces cover nail indenta tions joints finish coat can made very smooth Used plastic foam surface strong coating insulates protects plastic foam damage hot air used soften smooth epoxy coating need very thick thinner ap plications preferred reduce number coatings have applied take care shrinkage can occur thick sections Waxing form recommended since Saran Wrap can applied easily shrunk very neatly form After fiberglass work completed flexible palette knife used previously explained help re move cowling damage either cowling form author tried success locally procure balloons large enough easy-does-it method making engine cowling Jumbo-size 16 diameter balloons procured quite big enough cowl ing Therefore usual amount sanding necessary smooth finish word caution attempt ing use easy-does-it method Secure glass cloth well thumb tacks areas cut away prevent shifting due balloon breakage slippage Bal loons little too small may go onto form slip back off again especially back turned doing position loose fiber glass cloth will shifted Following rule thumb balloon least twice big form usually helps prevent trouble sloping shape engine cowling encouraged slippage balloons glance landing gear may tend make potential builder have second thoughts author confesses item did delay start project Happily landing gear came out right first time very little extra effort using four single pieces i/i diam eter piano wire finished product Since landing gear has 12 strut members wire simulates several struts order conserve building time piano wire author played around coat hanger wire develop side gear though calculated angles bends lengths struts paid attention lengths bent wire fit mount ing attach points soft pat tern wires correctly shaped pieces piano wire bent exactly same way Having completed side opposite side gear bent soft wire reversing bends required pieces piano wire bent duplicate side small vise mark ing Kodak negative pencil authors preference pair abrasive cut-off discsmounted arbor chuck Dremel toolwere tools used work piano wire coat hanger wire initially straightened first strut length marked wire allowance bend Having made bend next strut length marked wire al lowance bend process repeated until bends made adjusted meet attach points same procedure used piano wire using soft wire pattern visu al guide During design landing gear noted torsional restraint could utilized strengthen gear rather relying resistance bending alone done use grooved maple landing gear block Top Flite firmly af fixed screws epoxy back bottom edge plywood firewall Also using two other separate pieces short lengths grooved maple blocks tached points provided immediately front leading edge bottom wing front side plywood bulk head number 2 use mounting attach points piano wire started axle bent angle up toward middle firewall mounting block bent lay groove reverse direction exit same side turned up slightly inverted N bent side fuselage bulkhead number 2 Straps screws hold torsional portion groove after wire end plugged side fuselage hard wood separator block shown drawing attached landing gear block prevent shift torsional sections toward middle slipping groove under holding straps second piece wire formed attach rearward cowling near top longeron fuselage bent downward include Oleo strut bent under axle back under lower wing attach near center bottom fuselage rear trailing edge left right upper ends attach through individual Nylon brackets cut single CG Nylon nose-gear bracket bolted back plywood firewall ends held wheel collars rearward ends bent right angles inserted holes drilled 94 Model Aviation SCALE CLASICS Plans & Construction Manual CURTISS HAWK POESTINSON RELIANT BRO V Scale 945 Span S220 V Scale 126 Spat250 2Scale 63 Span S12 2Scale 84Span1500 11tSoale 47VoSpan 1000 l0Soela 63 Span$1260 CURTISS GOSHAWK FIlCO 2 Scale 63 SpanS1S~ CURTISS GULFHAWK lA . 2Soale 63 Span 51600 Scale 94 5pa 63000 Peaee Add 6160 P 040 Foetag sod 0e,dllog. OutSide US Add $300Make alt PSymeete Richard G Barron1213 Holly Spring Ln Grand Blanc MichIgan 48439 Seed Slos Complete toomatlen INSTALL AfidUun FUEL TANK ITS GOOD TO KNOW ITS IN THERE FULL TANK SYSTEM Modelers agree Sullivan has put gether k thats really can now fill tank top bubble allows enough room air tubing fitting neatly inside bubble tanks except smaller 4 oz clude Klapper-Klunk stiff-arm klunk klunk pick-ups se own system NEV-R-LEAK fuel tanks have standard favorite years Made better bubble-top FULL TANK SYSTEM now ll become tanks youll ever want use rectangular piece Epoxy printed cir cuit board attached bottom center area lower wing mounting block notched Nylon strap bolted under through lower wing constrains ends wire holes Epoxy mounting plate Attachment wire looped under axle axle itself matter personal preference author preferring use binding wire sol der made pair aluminum parts Nylon other materials could used instead point counts number bends wires will find number equal little wire gears affix back fire wall due number bends required prevent displacement firewall gear stronger construction others made size wire side tripod struts attaches top Oleo strut Oleo strut together two lower struts likewise forms tripod attaching wheel hub Application dope can expedited using 3-in cubes Polyurethane instead brush Use small aluminum pan margarine container hold dope Soak about dope side cube apply covering slight pressure will feed dope side pores cube reducing drag stroke However first coat silk cube should held off instant encourage slight dryness lightly touched silk ap ply too much dope cause runs Since weight especially tail has detri mental effect flying quality apply minimum amount dopein particular heavier color dope Experience indicated 20 right 20 down thrust would good first ap proximation angles needed straight level flight Offsets base engine mount about 5/32 inch can used bring propeller shaft center cowling better appear ance however should borne mind also offsets engine thrust line will decrease thrust correction angles required angles offsets desired together 20 positive set ting stabilizer should set first test flight Under conditions takeoff flight should accomplished less panic greater safety Hope fully trim adjustments will within limits trim available transmitter Any thought engine mount could machined thrust correction discarded found 148 inch would have removed measured point edge slanted 450 axis vertical 3-in diameter engine mount base Therefore large wedgeshaped aluminum shim form annulus ring washer made drilled provide mounting holes required engine mount installation Fig provides scientific accurate way determining specs making such aluminum wedge suggested 3/16 thick alumi num sheet stock used machining circular wedge shim Machine shim scribe position axis drill mounting holes type shim will produce firmest engine mount support Wing strut landing gear strut angles lengths can calculated similarly using compound angle formulas Simplest way visualize problem draw pyramid corner edge perpen dicular arectangular base longest edge representing strut question perpendicular distance tween attach points bends coordinates base can obtained original drawings accordance scale Projected angles can measured directly drawings unaffected scale Formulas type calculation listed Mechanics Vest Pocket Reference Book full explanation compound angles contained Practical Shop Mathemat ics Vol No 2 J H Wolfe E R Phelps McGraw-Hill After having prepared description good method use applying dope especially silk winter arrived odor dope would have offen sive Coverite applied word February 1 979 95 A Enough space air bubble B Fill tank top C Tube goes up air bubble 12-INCH LENGTH OFSULLI-CONETUBING FREE WITH EVERYTANK ATYPICAL ELEVAT/RuOOER INSlALLATION -xxxx 7G&PLIiIIiNGE COONEY * EASY INSTALLATION * NO AR GAP * FREE MOVEMENT * STRONG AND LIGHTWEIGHT MPLETELY FUELPROOF * COMPATIBLE WITH ALL IRON-ON COVERINGS FOURMOST RACING PRODU CTS 24th Avenue caution black color Coverite used tended bleed yellow Cover ite insignia trim Glaskote later used seal lettering would have prevented color bleeding painted contact surface prior trimming final installation assembly methods devised retaining fuel tank installing muffler providing good looking landing light lens First found square 12ounce Sullivan fuel tank fits nicely quart size cardboard milk carton simple matter cut position hold container place bulkhead #2 flat pieces apple taffy sticks important make installation removable access servos Another good way make engine bulkhead removable firewall complete engine fuel tank Secondly Slim Line Muffler fine engine installation should modified install right angles Beside looking much better muffler can re main engine during assembly removal cowling Viewed side modified muffler appears position imitates air inlet dummy engine Thirdly very realistic looking lens landing lights can made about five minutes Simply acquire pair plastic egg containers wife girl friend has purchased two pair Leggs panty hose Use largest end egg scribe required diameter circle inside spinning small compass Using pair scissors cut crack ing inscribed circle Attach lenses landing lights Pliobond cement record landing lights black dress up piano wire landing gear decided use large size straight plastic soda straws Short pieces black neoprene tubing Sullivan split snapped around wire concentrically space ends split plastic soda straws conceal split straws two concentric straws used splits oriented 1800 apart wire outside split can covered TYPICAL AILERO*J1NSTA L-A ON xX-x 35 length invisible Scotch tape fore after painting Likewise ends can retained wrap same tape Tests proved tape could doped fact dope will stay tape little loss gloss whereas dope may tend flake off smooth plastic straws flexed Sanding straws lightly roughen surface helps flight straws fly off Since Olco struts larger decided use cut off plastic barrel sec tions black felt pens sections pens split lengthwise means Xacto saw snapped over piano wire Concentric spacing accomplished build-up split neoprene tubing Axial shift pieces pens prevented Goo cement rubber like modelers cement author also applies prevent wheel colars com ing off etc preparation flying landing lights scale engine cowl re moved pair 3-in diameter wheels 13-5 propeller installed model balanced 12 ounces lead two 6 ounce sinkers engine mount moved CG forward about 30% location general everything done compen sate unwanted torque effects assure model would fly tail heavy Now happiest reward ing part test flights prototype Frank Stanton friend fellow club member agreed serve test pilot club field Johnsville NADC Warminster PA first check flight complete success Indications less ballast could have used trim adjustments required 50% left rudder trim 100% up elevator trim means transmitter trim ad justments airplane flew well trim changes surfaces second flight became stunt flight Would believe Frank flew large portion rolling circle Barring low sun position Frank probably would have gone way around Allowing fact model being flown very capable flier observers noted excellent manner Pitcairn Mailwing responded flight After test flights Franks comments Its good flying airplane Its piece cake fly next flying session Pitcairn Mailwing flown dressed-up inflight pictures time ballast weight reduced about 8 ounces Two flights flown shoot takeoff fly-by landing pictures surpris ing model did roll fast cause ailerons lower wing no differential utilized Aileron turns good turns made using rudder resulted loss al titude unusual Indications smooth grass fly ing fields would preferable hard sur face runways agreement ground handling original airplane flown landing lights scale engine cowl configuration tends protect damage should ground loop occur propeller sur vived two ground loops hard runways final note author has recently purchased Giant Round Balloons made Mexico distributed through World Toy House balloons look very promising use making large en gine cowls easy-does-it method course modelers should overlook possibility obtaining suitable balloons Hobbypoxy people origi nated method RC Aerobatics/Van Putte continued page 28 does guarantee Novice pattern tro phy enough good fliers around have make very difficult great flier win sport airplane several ways proceed al leviating situation have pitfalls will probably take grass roots movement have much effect pattern flying since major changes rules very infrequent unless widespread demonstration need desire change Contest Di rectors will have make decisions offer competition line proposed rule changes see work out National Society Radio Controlled Aerobatics NS RCA can strong fac tor proposed rule changes NSRCA district vice presidents should given feedback proposed changes issues can aired K Factor monthly newsletter NSRCA arent already NSRCA member send $10 1979 dues Mrs Sally Brown Secretary Treasurer 8534 Huddleston Drive Cincinnati OH 45236 thing has tried Con test Directors contests around coun try has introduction special Novice class beginners pattern com petition large contests have 96 Model Aviation LARGESMALL fit saafoces 1/8 thicker
Edition: Model Aviation - 1979/02
Page Numbers: 16, 17, 18, 19, 20, 21, 22, 23, 92, 94, 95, 96
NO OCR TEXT 4 have re will pose maximum ced 45 pounds p ai ed Ltuyin ce md 35 air time Cha I/16X ALL RIBS L F RC NO OCR TEXT LONOING LIGHTCGT-OLIT 2 REQUIRED lODE WING PLUS FOR POSITION REDUCE ROROER TO FLAT OURFACE I/WIG OR PLYWOOD INSERT OIOL MODIDTEO LANDING REAR SUPPORT BRACKET 0 REGOELEVATORDRONE SERVO MATE FROM NYLON NOSE WHEEL MOUNTINGERVSTIPS-lO SHOWN THROTTLE POSH ROD CA THROST OFFSET LI L 403 RDRGLSA7fl FORMER N 1 4Sg O~lL ERAFYHECI ~1 1 V ROSOER IV SERVO II ID INCH IIIII BELLCRANE KiL4Lii- Th---- hR SHEET WULSA TEMPORARY MOLDING RHUCE FORMER 3 IN 3G Ill I I I/ID SHEET HARDWOOD LANDING GEARI HOLWITING RLOCIS NOTE MOUNT ENLUNE 8TH ST DOWN THRUST DM0 ST RIGHT THRUST SIDE VIEW ODES NOT GROW ANT DOWN THRUST CANT FRONT OF TGWLWG TO AGREE WITH ANGLES SF TRRSSY OFFSET NOTE OGRE LONER PORTION SF FORMERS-S4 U T 8 FROM I/RD I/O DOLOR INST 511/WE OR TEMPLATESTG /8 BALSA FORMER 7OR SHEETFORMER S3132530R BALSA RALOG 3/3251/4 BALSA UTTUER OGRARE STRUTS ST FGSELAGE OSING HARDFORMERS WOOD SPACERD 0415 FRONTFORMER-U C 3/KIN HEGH___________G ALOD HEADREST /30 PLYWOUDWINDSHIELD COWLING I/lU PLYWOOD WING SADOL SPLIT IWOPREIWIGOERYG 2 EACH SIDE IGOFT FOAMREADTURING EGO/HO I]-iPOOHEDGING REMO5E RGLSUIIERHFT INSERT VWRL-Y -DECI WOOD POW I -- I/IN WALGA- ARA5STRUTG -I- L VEPRESENTATISE CYLINDERSGRFACE TO SGRFUCE___________ CRUNREADE IN LOWLINS FORUS CALCULATED___________ BRADY WHIRLWIND 15RUTTERY BOG SCALE ENGINE YfFIAIYD,STS/REII SCALE PROPELLER SIZE- lAO/H DIG/ HP Al FRE ENGINE GROWN 2ROLES FOR 3/KIND3/RG3/R TRIUNGULUR WING MOUNTING DOWELS3/H D3/R MUPLEDALSA INDIDE WING MOGNYING CROSS MEMHERI/IN EPOXY PC ROGRO I-OR LONG CALCULATEDG1I-I/U WIDE DRILL 2 HOLES hR GIG CS1/4 D3/RGI/ID NYLDN MLOCD3/H E TO G POD LANDING DEAR NOTCH I/W DEEP WITH S/H GIRDING DALL AT CENTER FOR RHDEREK K 2j 4 EDIA25/30 HER THICKNESSICC NOTE IWSDE MEGODREMENTT-GRTO DUD II /R#35 OIHLL 030 NOTE 2 STERPLANE WING STRUTS CALCULATED RR2 ISSURFACE TO OSREUCE DYRAL 3/H WIDE TEE ATTUCH POINTS OR WINGS / -S/FOR MER-2 I/A PLYWOOD 04 ALAATTERY DOD 0 OGGO 5/HG VH RADIO SHAdS MINI ROGMSDIFIEO SR DELLERUNK OH AL U CHANNEL I/A WIDE MADE FROM MINFROG SCRAP AL GOD 3/H MAPLE GEFOET SPACER H VA AL S/IN WIDE LENOTH TOSGIT REODIRED CONTROL HORDE BOLT SIDE BY SIDE TO HELLERORN GRILL POR DOD JACK SHAFT SPREE WITH REVLON TURES TOP NOTE WIRE NO3 OGII34ZIGLO FRUTAT SlEW 4/HOV SAYLOR CLEFIG STRUT FITTINGTHRI/ST ASIS ID REQUIRED N 0 0 5 IEM GSLE-i4,MOTTOM OR S PIANO WIRE -I I/A PlYWOOD FACRO SPUD SIGESOHI F BRACE 1 ANGLE EACH END LANDIBO ACAR BOLT FRILL S/IA U FR RAROWOOS INSERTWERBNR B-US SIDE P1501 NERDE FR I/S SALT RUSSIAROFRA FOR STRUT MB-B LOWER WINS BOLTALERIS1 PUSH ROE ALE LOCATIONS/ / IIII 3/ASIA RAROWOOG UTWELS MARE TAO UPPROS 2 IN ION 2/A NULGA SHAPE TO AIRFOIL II~ii /II LOWER WING 3/BUS/B BALSA UPPER WINO test hop builwntnrustl e fuselage blackin quart iling npound angle andMuseum utas derived DC o axis y 9 degrnon Airport Virginia West urn M engine mourn Ige new axis Y tan B e ie cc FIRE example using ved formulas nc Tables thrust C4 e ptnuary 1959 Amer II 1960 Air ing o ar bracinp lower br ously Pu ueI th nt model like mi Chief E ailerons ne lower ng UI isnodels t moving downwar neutral aft th move OSI1I ood way c d yaw Sta Openers/Winter continued page 4 cloaks clock-watchers see some hearts can saddened Like TVs Dangerfield dont get no respect see irony power center AMA Washington Un der by-laws membership elects district vice presidents also Council members Almost far away states caliber people testifies judgment members elected themthey capable As group meet four times year deal best abil ities matters before qualifications businessmen pri vate life impeccable dont defend perfect expected anyone human being perhaps feel no defense FO needed welcome Perhaps make mistakes cannot say Perhaps timing things always brilliant devious calculating po lit icalthey modelers serving volun tarily know believe what decide motivated what feel best Sometimes means Executive Director minority Council meeting happens right Council charge no governmental agency-type Secre tary Washington can Big Brother us what FO about say could receive pink slip simply Recent actions have taken place done some us may drop wayside awhile will go growing Council hear message members call out proceed caution lay out new programs added expenses things members think AMA should Most members above dues increase less cost next weeks fuel buy other magazine almost much AMA asks magazine insurance other benefits others among us ask Should go response few people have ad dressed editor let us keep cool Dues increases however necessary brew negative reactionsnobody willingly ac cepts higher prices cant let ex perts confuse us individual mem bers can make own assessments finally patient readers may say Fine youAMA pays salary answer simply should hope can well other ways like old warhorse FO likes sniff battlefield challenge improve magazine see firmly its way mem bership tool par excellance help AMA grow prosper right know way words used discussion parody Supreme Court deci sions meaning Should everyones cor respondence AMA headquarters plastered billboard present instance publications demand AMA print letter critique logically based upon imagined need shed light some secretive wrong doing AMA has asked account pa per clips sugar cubes etc broken down AMA use Model Aviation use true joke think Watergate Deep Throat Will Judge Jaworski appear doorway Enough already Speaking rights almost 50000 people wanted paid Model Aviation 1978 have Can two critics seriously think people great majority Open mem bers can denied what prefer troubled FO offers words late President Jack Kennedy great enemy truth very ten liedeliberate contrived dishonest mythpersistent persuasive unrealistic Too often hold fast cliches fore-bear ers subject facts prefabricat ed set interpretations enjoy comfort opinion discom fort thought Greatest Show/Howard continued page 13 tions booth several years draws lots interest spec tators AMA represented president Johnny Clemens Larry Bolich special events director Earl Witt secretary-treasurer AMA always very responsive type public exposure could go on about fun fellowship fliers enjoy show photos show much words can tell can see Flying Circus future make plans participate Enjoy hobby Pitcairn/Stott continued page 23 per wing span would have 66 inches An increase over 4 inches upper wing span would have made assembled model airplane too large placed back seat automobile scale model designer builder must decide detailed scale model should decision involves consideration available material time money shop equipment desired usage ability Now Sport Scale Stand-Off Scale gaining popular ity over true scale choice has broadened authors decisions largely compromise based desire fun fly moderately windy weather possibly enter contest requiring exact scale Although model deviates scale selection airfoil slightly larger engine scale plans show true outline except previously noted realistic appearance slightly over-size 2 inch ot Williams Wright Whirlwind J5 installed way largely conceal inverted 60 engine Further streamlining camouflaging engine accomplished fiber glass cowling provide much space around engine possible muffler permit installation battery pack under cowling desired help establish correct CG location resorting- excess dead weight balance common practice remove scalelike engines routine test flights necessary substitute equivalent weight prevent shift CG reason fiberglass cowl engine crankcase formed separate molded parts crankcase form made hard balsa previously used packing crating because its weight balsa cut discs laminated before shaping size During machining observed form tended turn out round lathe due end grain cutting same other grain directions Care taken bring form back round hand work Finally form fitted -in diameter wood-holding dowel centrally located extend axially out back dowel can supported easily vise applying fiber glass No attempt made provide draft taper form diameters since believed fiberglass crank case would have cut form anyway pleasant sur prise easy-does-it method completed fiberglass crankcase removed piece damage either crankcase form method removal follows I Remove thumb tacks held Saran Wrap glass cloth place being coated Hobbypoxy II during placement balloon cover lay-up 2 Trim fiberglass rear outer di ameter assure no fiberglass locks around back corner form rough out front open hole fiber glass cowl removing excess cut away extract thumb tacks operations easier fiber glass has cured two three hours has completely hardened 3 Insert artists flexible palette knife rear form under fiberglass Saran Wrap Japa nese artist paint mixing knife used 92 Model Aviation author 3-in flexible blade tapered thickness 014 inch tip 028 inch handle Also sides knife slightly tapered tip bent upward almost im perceptible amount Slide knife axi ally along surface work 3600 around formthe same way cooks re move cakes layer-cake pans will free fiberglass form Some slight temporary stretching may oc cur Saran Wrap may displaced partially Repeat process until fiberglass crankcase can pulled form author has omitted ba sic details easy-does-it method cause has published Hobby poxy other detailed published articles following comments will assist decision making emphasize certain important details Three layers glass cloth good coatings Hobbypoxy II will make light crankcase five layers glass cloth starting medium weight finishing light weight glass cloth would better Smoother thinner coatings epoxy can applied epoxy kept warm during ap plication means small hair dryer Bubbles can excluded careful ap plication under warm conditions worry about bubblessince mar surface can opened filled later show painted Care should taken prevent roundoff flats crankcase provided mounting engine cylinders can accomplished taping layer foam rubber over deflated balloon press evenly completely around section having flats epoxy hardens use rubber bands re tain foam rubber because will localize pressure too much per manently indent fiberglass Masking tape works well hold foam rubber place engine cowling form made us ing layers scrap plastic foam shaped a sheets laminated front back serve templates prevent distortion rounding front back corners under pressure holding dowel built form After form shaped size author used US Gypsum Top Coat mixed water fill pores plastic foam blend shape form almost dry hard form completely sanded Top Coat easily sanded very rough fully hard ened possible sand easily very slight amount moisture still remains just prior final hardening Top Coat can better job less ex pense compared use filler coating made Tite Bond cement Commercially Top Coat used pre pared wall surfaces cover nail indenta tions joints finish coat can made very smooth Used plastic foam surface strong coating insulates protects plastic foam damage hot air used soften smooth epoxy coating need very thick thinner ap plications preferred reduce number coatings have applied take care shrinkage can occur thick sections Waxing form recommended since Saran Wrap can applied easily shrunk very neatly form After fiberglass work completed flexible palette knife used previously explained help re move cowling damage either cowling form author tried success locally procure balloons large enough easy-does-it method making engine cowling Jumbo-size 16 diameter balloons procured quite big enough cowl ing Therefore usual amount sanding necessary smooth finish word caution attempt ing use easy-does-it method Secure glass cloth well thumb tacks areas cut away prevent shifting due balloon breakage slippage Bal loons little too small may go onto form slip back off again especially back turned doing position loose fiber glass cloth will shifted Following rule thumb balloon least twice big form usually helps prevent trouble sloping shape engine cowling encouraged slippage balloons glance landing gear may tend make potential builder have second thoughts author confesses item did delay start project Happily landing gear came out right first time very little extra effort using four single pieces i/i diam eter piano wire finished product Since landing gear has 12 strut members wire simulates several struts order conserve building time piano wire author played around coat hanger wire develop side gear though calculated angles bends lengths struts paid attention lengths bent wire fit mount ing attach points soft pat tern wires correctly shaped pieces piano wire bent exactly same way Having completed side opposite side gear bent soft wire reversing bends required pieces piano wire bent duplicate side small vise mark ing Kodak negative pencil authors preference pair abrasive cut-off discsmounted arbor chuck Dremel toolwere tools used work piano wire coat hanger wire initially straightened first strut length marked wire allowance bend Having made bend next strut length marked wire al lowance bend process repeated until bends made adjusted meet attach points same procedure used piano wire using soft wire pattern visu al guide During design landing gear noted torsional restraint could utilized strengthen gear rather relying resistance bending alone done use grooved maple landing gear block Top Flite firmly af fixed screws epoxy back bottom edge plywood firewall Also using two other separate pieces short lengths grooved maple blocks tached points provided immediately front leading edge bottom wing front side plywood bulk head number 2 use mounting attach points piano wire started axle bent angle up toward middle firewall mounting block bent lay groove reverse direction exit same side turned up slightly inverted N bent side fuselage bulkhead number 2 Straps screws hold torsional portion groove after wire end plugged side fuselage hard wood separator block shown drawing attached landing gear block prevent shift torsional sections toward middle slipping groove under holding straps second piece wire formed attach rearward cowling near top longeron fuselage bent downward include Oleo strut bent under axle back under lower wing attach near center bottom fuselage rear trailing edge left right upper ends attach through individual Nylon brackets cut single CG Nylon nose-gear bracket bolted back plywood firewall ends held wheel collars rearward ends bent right angles inserted holes drilled 94 Model Aviation SCALE CLASICS Plans & Construction Manual CURTISS HAWK POESTINSON RELIANT BRO V Scale 945 Span S220 V Scale 126 Spat250 2Scale 63 Span S12 2Scale 84Span1500 11tSoale 47VoSpan 1000 l0Soela 63 Span$1260 CURTISS GOSHAWK FIlCO 2 Scale 63 SpanS1S~ CURTISS GULFHAWK lA . 2Soale 63 Span 51600 Scale 94 5pa 63000 Peaee Add 6160 P 040 Foetag sod 0e,dllog. OutSide US Add $300Make alt PSymeete Richard G Barron1213 Holly Spring Ln Grand Blanc MichIgan 48439 Seed Slos Complete toomatlen INSTALL AfidUun FUEL TANK ITS GOOD TO KNOW ITS IN THERE FULL TANK SYSTEM Modelers agree Sullivan has put gether k thats really can now fill tank top bubble allows enough room air tubing fitting neatly inside bubble tanks except smaller 4 oz clude Klapper-Klunk stiff-arm klunk klunk pick-ups se own system NEV-R-LEAK fuel tanks have standard favorite years Made better bubble-top FULL TANK SYSTEM now ll become tanks youll ever want use rectangular piece Epoxy printed cir cuit board attached bottom center area lower wing mounting block notched Nylon strap bolted under through lower wing constrains ends wire holes Epoxy mounting plate Attachment wire looped under axle axle itself matter personal preference author preferring use binding wire sol der made pair aluminum parts Nylon other materials could used instead point counts number bends wires will find number equal little wire gears affix back fire wall due number bends required prevent displacement firewall gear stronger construction others made size wire side tripod struts attaches top Oleo strut Oleo strut together two lower struts likewise forms tripod attaching wheel hub Application dope can expedited using 3-in cubes Polyurethane instead brush Use small aluminum pan margarine container hold dope Soak about dope side cube apply covering slight pressure will feed dope side pores cube reducing drag stroke However first coat silk cube should held off instant encourage slight dryness lightly touched silk ap ply too much dope cause runs Since weight especially tail has detri mental effect flying quality apply minimum amount dopein particular heavier color dope Experience indicated 20 right 20 down thrust would good first ap proximation angles needed straight level flight Offsets base engine mount about 5/32 inch can used bring propeller shaft center cowling better appear ance however should borne mind also offsets engine thrust line will decrease thrust correction angles required angles offsets desired together 20 positive set ting stabilizer should set first test flight Under conditions takeoff flight should accomplished less panic greater safety Hope fully trim adjustments will within limits trim available transmitter Any thought engine mount could machined thrust correction discarded found 148 inch would have removed measured point edge slanted 450 axis vertical 3-in diameter engine mount base Therefore large wedgeshaped aluminum shim form annulus ring washer made drilled provide mounting holes required engine mount installation Fig provides scientific accurate way determining specs making such aluminum wedge suggested 3/16 thick alumi num sheet stock used machining circular wedge shim Machine shim scribe position axis drill mounting holes type shim will produce firmest engine mount support Wing strut landing gear strut angles lengths can calculated similarly using compound angle formulas Simplest way visualize problem draw pyramid corner edge perpen dicular arectangular base longest edge representing strut question perpendicular distance tween attach points bends coordinates base can obtained original drawings accordance scale Projected angles can measured directly drawings unaffected scale Formulas type calculation listed Mechanics Vest Pocket Reference Book full explanation compound angles contained Practical Shop Mathemat ics Vol No 2 J H Wolfe E R Phelps McGraw-Hill After having prepared description good method use applying dope especially silk winter arrived odor dope would have offen sive Coverite applied word February 1 979 95 A Enough space air bubble B Fill tank top C Tube goes up air bubble 12-INCH LENGTH OFSULLI-CONETUBING FREE WITH EVERYTANK ATYPICAL ELEVAT/RuOOER INSlALLATION -xxxx 7G&PLIiIIiNGE COONEY * EASY INSTALLATION * NO AR GAP * FREE MOVEMENT * STRONG AND LIGHTWEIGHT MPLETELY FUELPROOF * COMPATIBLE WITH ALL IRON-ON COVERINGS FOURMOST RACING PRODU CTS 24th Avenue caution black color Coverite used tended bleed yellow Cover ite insignia trim Glaskote later used seal lettering would have prevented color bleeding painted contact surface prior trimming final installation assembly methods devised retaining fuel tank installing muffler providing good looking landing light lens First found square 12ounce Sullivan fuel tank fits nicely quart size cardboard milk carton simple matter cut position hold container place bulkhead #2 flat pieces apple taffy sticks important make installation removable access servos Another good way make engine bulkhead removable firewall complete engine fuel tank Secondly Slim Line Muffler fine engine installation should modified install right angles Beside looking much better muffler can re main engine during assembly removal cowling Viewed side modified muffler appears position imitates air inlet dummy engine Thirdly very realistic looking lens landing lights can made about five minutes Simply acquire pair plastic egg containers wife girl friend has purchased two pair Leggs panty hose Use largest end egg scribe required diameter circle inside spinning small compass Using pair scissors cut crack ing inscribed circle Attach lenses landing lights Pliobond cement record landing lights black dress up piano wire landing gear decided use large size straight plastic soda straws Short pieces black neoprene tubing Sullivan split snapped around wire concentrically space ends split plastic soda straws conceal split straws two concentric straws used splits oriented 1800 apart wire outside split can covered TYPICAL AILERO*J1NSTA L-A ON xX-x 35 length invisible Scotch tape fore after painting Likewise ends can retained wrap same tape Tests proved tape could doped fact dope will stay tape little loss gloss whereas dope may tend flake off smooth plastic straws flexed Sanding straws lightly roughen surface helps flight straws fly off Since Olco struts larger decided use cut off plastic barrel sec tions black felt pens sections pens split lengthwise means Xacto saw snapped over piano wire Concentric spacing accomplished build-up split neoprene tubing Axial shift pieces pens prevented Goo cement rubber like modelers cement author also applies prevent wheel colars com ing off etc preparation flying landing lights scale engine cowl re moved pair 3-in diameter wheels 13-5 propeller installed model balanced 12 ounces lead two 6 ounce sinkers engine mount moved CG forward about 30% location general everything done compen sate unwanted torque effects assure model would fly tail heavy Now happiest reward ing part test flights prototype Frank Stanton friend fellow club member agreed serve test pilot club field Johnsville NADC Warminster PA first check flight complete success Indications less ballast could have used trim adjustments required 50% left rudder trim 100% up elevator trim means transmitter trim ad justments airplane flew well trim changes surfaces second flight became stunt flight Would believe Frank flew large portion rolling circle Barring low sun position Frank probably would have gone way around Allowing fact model being flown very capable flier observers noted excellent manner Pitcairn Mailwing responded flight After test flights Franks comments Its good flying airplane Its piece cake fly next flying session Pitcairn Mailwing flown dressed-up inflight pictures time ballast weight reduced about 8 ounces Two flights flown shoot takeoff fly-by landing pictures surpris ing model did roll fast cause ailerons lower wing no differential utilized Aileron turns good turns made using rudder resulted loss al titude unusual Indications smooth grass fly ing fields would preferable hard sur face runways agreement ground handling original airplane flown landing lights scale engine cowl configuration tends protect damage should ground loop occur propeller sur vived two ground loops hard runways final note author has recently purchased Giant Round Balloons made Mexico distributed through World Toy House balloons look very promising use making large en gine cowls easy-does-it method course modelers should overlook possibility obtaining suitable balloons Hobbypoxy people origi nated method RC Aerobatics/Van Putte continued page 28 does guarantee Novice pattern tro phy enough good fliers around have make very difficult great flier win sport airplane several ways proceed al leviating situation have pitfalls will probably take grass roots movement have much effect pattern flying since major changes rules very infrequent unless widespread demonstration need desire change Contest Di rectors will have make decisions offer competition line proposed rule changes see work out National Society Radio Controlled Aerobatics NS RCA can strong fac tor proposed rule changes NSRCA district vice presidents should given feedback proposed changes issues can aired K Factor monthly newsletter NSRCA arent already NSRCA member send $10 1979 dues Mrs Sally Brown Secretary Treasurer 8534 Huddleston Drive Cincinnati OH 45236 thing has tried Con test Directors contests around coun try has introduction special Novice class beginners pattern com petition large contests have 96 Model Aviation LARGESMALL fit saafoces 1/8 thicker
Edition: Model Aviation - 1979/02
Page Numbers: 16, 17, 18, 19, 20, 21, 22, 23, 92, 94, 95, 96
NO OCR TEXT 4 have re will pose maximum ced 45 pounds p ai ed Ltuyin ce md 35 air time Cha I/16X ALL RIBS L F RC NO OCR TEXT LONOING LIGHTCGT-OLIT 2 REQUIRED lODE WING PLUS FOR POSITION REDUCE ROROER TO FLAT OURFACE I/WIG OR PLYWOOD INSERT OIOL MODIDTEO LANDING REAR SUPPORT BRACKET 0 REGOELEVATORDRONE SERVO MATE FROM NYLON NOSE WHEEL MOUNTINGERVSTIPS-lO SHOWN THROTTLE POSH ROD CA THROST OFFSET LI L 403 RDRGLSA7fl FORMER N 1 4Sg O~lL ERAFYHECI ~1 1 V ROSOER IV SERVO II ID INCH IIIII BELLCRANE KiL4Lii- Th---- hR SHEET WULSA TEMPORARY MOLDING RHUCE FORMER 3 IN 3G Ill I I I/ID SHEET HARDWOOD LANDING GEARI HOLWITING RLOCIS NOTE MOUNT ENLUNE 8TH ST DOWN THRUST DM0 ST RIGHT THRUST SIDE VIEW ODES NOT GROW ANT DOWN THRUST CANT FRONT OF TGWLWG TO AGREE WITH ANGLES SF TRRSSY OFFSET NOTE OGRE LONER PORTION SF FORMERS-S4 U T 8 FROM I/RD I/O DOLOR INST 511/WE OR TEMPLATESTG /8 BALSA FORMER 7OR SHEETFORMER S3132530R BALSA RALOG 3/3251/4 BALSA UTTUER OGRARE STRUTS ST FGSELAGE OSING HARDFORMERS WOOD SPACERD 0415 FRONTFORMER-U C 3/KIN HEGH___________G ALOD HEADREST /30 PLYWOUDWINDSHIELD COWLING I/lU PLYWOOD WING SADOL SPLIT IWOPREIWIGOERYG 2 EACH SIDE IGOFT FOAMREADTURING EGO/HO I]-iPOOHEDGING REMO5E RGLSUIIERHFT INSERT VWRL-Y -DECI WOOD POW I -- I/IN WALGA- ARA5STRUTG -I- L VEPRESENTATISE CYLINDERSGRFACE TO SGRFUCE___________ CRUNREADE IN LOWLINS FORUS CALCULATED___________ BRADY WHIRLWIND 15RUTTERY BOG SCALE ENGINE YfFIAIYD,STS/REII SCALE PROPELLER SIZE- lAO/H DIG/ HP Al FRE ENGINE GROWN 2ROLES FOR 3/KIND3/RG3/R TRIUNGULUR WING MOUNTING DOWELS3/H D3/R MUPLEDALSA INDIDE WING MOGNYING CROSS MEMHERI/IN EPOXY PC ROGRO I-OR LONG CALCULATEDG1I-I/U WIDE DRILL 2 HOLES hR GIG CS1/4 D3/RGI/ID NYLDN MLOCD3/H E TO G POD LANDING DEAR NOTCH I/W DEEP WITH S/H GIRDING DALL AT CENTER FOR RHDEREK K 2j 4 EDIA25/30 HER THICKNESSICC NOTE IWSDE MEGODREMENTT-GRTO DUD II /R#35 OIHLL 030 NOTE 2 STERPLANE WING STRUTS CALCULATED RR2 ISSURFACE TO OSREUCE DYRAL 3/H WIDE TEE ATTUCH POINTS OR WINGS / -S/FOR MER-2 I/A PLYWOOD 04 ALAATTERY DOD 0 OGGO 5/HG VH RADIO SHAdS MINI ROGMSDIFIEO SR DELLERUNK OH AL U CHANNEL I/A WIDE MADE FROM MINFROG SCRAP AL GOD 3/H MAPLE GEFOET SPACER H VA AL S/IN WIDE LENOTH TOSGIT REODIRED CONTROL HORDE BOLT SIDE BY SIDE TO HELLERORN GRILL POR DOD JACK SHAFT SPREE WITH REVLON TURES TOP NOTE WIRE NO3 OGII34ZIGLO FRUTAT SlEW 4/HOV SAYLOR CLEFIG STRUT FITTINGTHRI/ST ASIS ID REQUIRED N 0 0 5 IEM GSLE-i4,MOTTOM OR S PIANO WIRE -I I/A PlYWOOD FACRO SPUD SIGESOHI F BRACE 1 ANGLE EACH END LANDIBO ACAR BOLT FRILL S/IA U FR RAROWOOS INSERTWERBNR B-US SIDE P1501 NERDE FR I/S SALT RUSSIAROFRA FOR STRUT MB-B LOWER WINS BOLTALERIS1 PUSH ROE ALE LOCATIONS/ / IIII 3/ASIA RAROWOOG UTWELS MARE TAO UPPROS 2 IN ION 2/A NULGA SHAPE TO AIRFOIL II~ii /II LOWER WING 3/BUS/B BALSA UPPER WINO test hop builwntnrustl e fuselage blackin quart iling npound angle andMuseum utas derived DC o axis y 9 degrnon Airport Virginia West urn M engine mourn Ige new axis Y tan B e ie cc FIRE example using ved formulas nc Tables thrust C4 e ptnuary 1959 Amer II 1960 Air ing o ar bracinp lower br ously Pu ueI th nt model like mi Chief E ailerons ne lower ng UI isnodels t moving downwar neutral aft th move OSI1I ood way c d yaw Sta Openers/Winter continued page 4 cloaks clock-watchers see some hearts can saddened Like TVs Dangerfield dont get no respect see irony power center AMA Washington Un der by-laws membership elects district vice presidents also Council members Almost far away states caliber people testifies judgment members elected themthey capable As group meet four times year deal best abil ities matters before qualifications businessmen pri vate life impeccable dont defend perfect expected anyone human being perhaps feel no defense FO needed welcome Perhaps make mistakes cannot say Perhaps timing things always brilliant devious calculating po lit icalthey modelers serving volun tarily know believe what decide motivated what feel best Sometimes means Executive Director minority Council meeting happens right Council charge no governmental agency-type Secre tary Washington can Big Brother us what FO about say could receive pink slip simply Recent actions have taken place done some us may drop wayside awhile will go growing Council hear message members call out proceed caution lay out new programs added expenses things members think AMA should Most members above dues increase less cost next weeks fuel buy other magazine almost much AMA asks magazine insurance other benefits others among us ask Should go response few people have ad dressed editor let us keep cool Dues increases however necessary brew negative reactionsnobody willingly ac cepts higher prices cant let ex perts confuse us individual mem bers can make own assessments finally patient readers may say Fine youAMA pays salary answer simply should hope can well other ways like old warhorse FO likes sniff battlefield challenge improve magazine see firmly its way mem bership tool par excellance help AMA grow prosper right know way words used discussion parody Supreme Court deci sions meaning Should everyones cor respondence AMA headquarters plastered billboard present instance publications demand AMA print letter critique logically based upon imagined need shed light some secretive wrong doing AMA has asked account pa per clips sugar cubes etc broken down AMA use Model Aviation use true joke think Watergate Deep Throat Will Judge Jaworski appear doorway Enough already Speaking rights almost 50000 people wanted paid Model Aviation 1978 have Can two critics seriously think people great majority Open mem bers can denied what prefer troubled FO offers words late President Jack Kennedy great enemy truth very ten liedeliberate contrived dishonest mythpersistent persuasive unrealistic Too often hold fast cliches fore-bear ers subject facts prefabricat ed set interpretations enjoy comfort opinion discom fort thought Greatest Show/Howard continued page 13 tions booth several years draws lots interest spec tators AMA represented president Johnny Clemens Larry Bolich special events director Earl Witt secretary-treasurer AMA always very responsive type public exposure could go on about fun fellowship fliers enjoy show photos show much words can tell can see Flying Circus future make plans participate Enjoy hobby Pitcairn/Stott continued page 23 per wing span would have 66 inches An increase over 4 inches upper wing span would have made assembled model airplane too large placed back seat automobile scale model designer builder must decide detailed scale model should decision involves consideration available material time money shop equipment desired usage ability Now Sport Scale Stand-Off Scale gaining popular ity over true scale choice has broadened authors decisions largely compromise based desire fun fly moderately windy weather possibly enter contest requiring exact scale Although model deviates scale selection airfoil slightly larger engine scale plans show true outline except previously noted realistic appearance slightly over-size 2 inch ot Williams Wright Whirlwind J5 installed way largely conceal inverted 60 engine Further streamlining camouflaging engine accomplished fiber glass cowling provide much space around engine possible muffler permit installation battery pack under cowling desired help establish correct CG location resorting- excess dead weight balance common practice remove scalelike engines routine test flights necessary substitute equivalent weight prevent shift CG reason fiberglass cowl engine crankcase formed separate molded parts crankcase form made hard balsa previously used packing crating because its weight balsa cut discs laminated before shaping size During machining observed form tended turn out round lathe due end grain cutting same other grain directions Care taken bring form back round hand work Finally form fitted -in diameter wood-holding dowel centrally located extend axially out back dowel can supported easily vise applying fiber glass No attempt made provide draft taper form diameters since believed fiberglass crank case would have cut form anyway pleasant sur prise easy-does-it method completed fiberglass crankcase removed piece damage either crankcase form method removal follows I Remove thumb tacks held Saran Wrap glass cloth place being coated Hobbypoxy II during placement balloon cover lay-up 2 Trim fiberglass rear outer di ameter assure no fiberglass locks around back corner form rough out front open hole fiber glass cowl removing excess cut away extract thumb tacks operations easier fiber glass has cured two three hours has completely hardened 3 Insert artists flexible palette knife rear form under fiberglass Saran Wrap Japa nese artist paint mixing knife used 92 Model Aviation author 3-in flexible blade tapered thickness 014 inch tip 028 inch handle Also sides knife slightly tapered tip bent upward almost im perceptible amount Slide knife axi ally along surface work 3600 around formthe same way cooks re move cakes layer-cake pans will free fiberglass form Some slight temporary stretching may oc cur Saran Wrap may displaced partially Repeat process until fiberglass crankcase can pulled form author has omitted ba sic details easy-does-it method cause has published Hobby poxy other detailed published articles following comments will assist decision making emphasize certain important details Three layers glass cloth good coatings Hobbypoxy II will make light crankcase five layers glass cloth starting medium weight finishing light weight glass cloth would better Smoother thinner coatings epoxy can applied epoxy kept warm during ap plication means small hair dryer Bubbles can excluded careful ap plication under warm conditions worry about bubblessince mar surface can opened filled later show painted Care should taken prevent roundoff flats crankcase provided mounting engine cylinders can accomplished taping layer foam rubber over deflated balloon press evenly completely around section having flats epoxy hardens use rubber bands re tain foam rubber because will localize pressure too much per manently indent fiberglass Masking tape works well hold foam rubber place engine cowling form made us ing layers scrap plastic foam shaped a sheets laminated front back serve templates prevent distortion rounding front back corners under pressure holding dowel built form After form shaped size author used US Gypsum Top Coat mixed water fill pores plastic foam blend shape form almost dry hard form completely sanded Top Coat easily sanded very rough fully hard ened possible sand easily very slight amount moisture still remains just prior final hardening Top Coat can better job less ex pense compared use filler coating made Tite Bond cement Commercially Top Coat used pre pared wall surfaces cover nail indenta tions joints finish coat can made very smooth Used plastic foam surface strong coating insulates protects plastic foam damage hot air used soften smooth epoxy coating need very thick thinner ap plications preferred reduce number coatings have applied take care shrinkage can occur thick sections Waxing form recommended since Saran Wrap can applied easily shrunk very neatly form After fiberglass work completed flexible palette knife used previously explained help re move cowling damage either cowling form author tried success locally procure balloons large enough easy-does-it method making engine cowling Jumbo-size 16 diameter balloons procured quite big enough cowl ing Therefore usual amount sanding necessary smooth finish word caution attempt ing use easy-does-it method Secure glass cloth well thumb tacks areas cut away prevent shifting due balloon breakage slippage Bal loons little too small may go onto form slip back off again especially back turned doing position loose fiber glass cloth will shifted Following rule thumb balloon least twice big form usually helps prevent trouble sloping shape engine cowling encouraged slippage balloons glance landing gear may tend make potential builder have second thoughts author confesses item did delay start project Happily landing gear came out right first time very little extra effort using four single pieces i/i diam eter piano wire finished product Since landing gear has 12 strut members wire simulates several struts order conserve building time piano wire author played around coat hanger wire develop side gear though calculated angles bends lengths struts paid attention lengths bent wire fit mount ing attach points soft pat tern wires correctly shaped pieces piano wire bent exactly same way Having completed side opposite side gear bent soft wire reversing bends required pieces piano wire bent duplicate side small vise mark ing Kodak negative pencil authors preference pair abrasive cut-off discsmounted arbor chuck Dremel toolwere tools used work piano wire coat hanger wire initially straightened first strut length marked wire allowance bend Having made bend next strut length marked wire al lowance bend process repeated until bends made adjusted meet attach points same procedure used piano wire using soft wire pattern visu al guide During design landing gear noted torsional restraint could utilized strengthen gear rather relying resistance bending alone done use grooved maple landing gear block Top Flite firmly af fixed screws epoxy back bottom edge plywood firewall Also using two other separate pieces short lengths grooved maple blocks tached points provided immediately front leading edge bottom wing front side plywood bulk head number 2 use mounting attach points piano wire started axle bent angle up toward middle firewall mounting block bent lay groove reverse direction exit same side turned up slightly inverted N bent side fuselage bulkhead number 2 Straps screws hold torsional portion groove after wire end plugged side fuselage hard wood separator block shown drawing attached landing gear block prevent shift torsional sections toward middle slipping groove under holding straps second piece wire formed attach rearward cowling near top longeron fuselage bent downward include Oleo strut bent under axle back under lower wing attach near center bottom fuselage rear trailing edge left right upper ends attach through individual Nylon brackets cut single CG Nylon nose-gear bracket bolted back plywood firewall ends held wheel collars rearward ends bent right angles inserted holes drilled 94 Model Aviation SCALE CLASICS Plans & Construction Manual CURTISS HAWK POESTINSON RELIANT BRO V Scale 945 Span S220 V Scale 126 Spat250 2Scale 63 Span S12 2Scale 84Span1500 11tSoale 47VoSpan 1000 l0Soela 63 Span$1260 CURTISS GOSHAWK FIlCO 2 Scale 63 SpanS1S~ CURTISS GULFHAWK lA . 2Soale 63 Span 51600 Scale 94 5pa 63000 Peaee Add 6160 P 040 Foetag sod 0e,dllog. OutSide US Add $300Make alt PSymeete Richard G Barron1213 Holly Spring Ln Grand Blanc MichIgan 48439 Seed Slos Complete toomatlen INSTALL AfidUun FUEL TANK ITS GOOD TO KNOW ITS IN THERE FULL TANK SYSTEM Modelers agree Sullivan has put gether k thats really can now fill tank top bubble allows enough room air tubing fitting neatly inside bubble tanks except smaller 4 oz clude Klapper-Klunk stiff-arm klunk klunk pick-ups se own system NEV-R-LEAK fuel tanks have standard favorite years Made better bubble-top FULL TANK SYSTEM now ll become tanks youll ever want use rectangular piece Epoxy printed cir cuit board attached bottom center area lower wing mounting block notched Nylon strap bolted under through lower wing constrains ends wire holes Epoxy mounting plate Attachment wire looped under axle axle itself matter personal preference author preferring use binding wire sol der made pair aluminum parts Nylon other materials could used instead point counts number bends wires will find number equal little wire gears affix back fire wall due number bends required prevent displacement firewall gear stronger construction others made size wire side tripod struts attaches top Oleo strut Oleo strut together two lower struts likewise forms tripod attaching wheel hub Application dope can expedited using 3-in cubes Polyurethane instead brush Use small aluminum pan margarine container hold dope Soak about dope side cube apply covering slight pressure will feed dope side pores cube reducing drag stroke However first coat silk cube should held off instant encourage slight dryness lightly touched silk ap ply too much dope cause runs Since weight especially tail has detri mental effect flying quality apply minimum amount dopein particular heavier color dope Experience indicated 20 right 20 down thrust would good first ap proximation angles needed straight level flight Offsets base engine mount about 5/32 inch can used bring propeller shaft center cowling better appear ance however should borne mind also offsets engine thrust line will decrease thrust correction angles required angles offsets desired together 20 positive set ting stabilizer should set first test flight Under conditions takeoff flight should accomplished less panic greater safety Hope fully trim adjustments will within limits trim available transmitter Any thought engine mount could machined thrust correction discarded found 148 inch would have removed measured point edge slanted 450 axis vertical 3-in diameter engine mount base Therefore large wedgeshaped aluminum shim form annulus ring washer made drilled provide mounting holes required engine mount installation Fig provides scientific accurate way determining specs making such aluminum wedge suggested 3/16 thick alumi num sheet stock used machining circular wedge shim Machine shim scribe position axis drill mounting holes type shim will produce firmest engine mount support Wing strut landing gear strut angles lengths can calculated similarly using compound angle formulas Simplest way visualize problem draw pyramid corner edge perpen dicular arectangular base longest edge representing strut question perpendicular distance tween attach points bends coordinates base can obtained original drawings accordance scale Projected angles can measured directly drawings unaffected scale Formulas type calculation listed Mechanics Vest Pocket Reference Book full explanation compound angles contained Practical Shop Mathemat ics Vol No 2 J H Wolfe E R Phelps McGraw-Hill After having prepared description good method use applying dope especially silk winter arrived odor dope would have offen sive Coverite applied word February 1 979 95 A Enough space air bubble B Fill tank top C Tube goes up air bubble 12-INCH LENGTH OFSULLI-CONETUBING FREE WITH EVERYTANK ATYPICAL ELEVAT/RuOOER INSlALLATION -xxxx 7G&PLIiIIiNGE COONEY * EASY INSTALLATION * NO AR GAP * FREE MOVEMENT * STRONG AND LIGHTWEIGHT MPLETELY FUELPROOF * COMPATIBLE WITH ALL IRON-ON COVERINGS FOURMOST RACING PRODU CTS 24th Avenue caution black color Coverite used tended bleed yellow Cover ite insignia trim Glaskote later used seal lettering would have prevented color bleeding painted contact surface prior trimming final installation assembly methods devised retaining fuel tank installing muffler providing good looking landing light lens First found square 12ounce Sullivan fuel tank fits nicely quart size cardboard milk carton simple matter cut position hold container place bulkhead #2 flat pieces apple taffy sticks important make installation removable access servos Another good way make engine bulkhead removable firewall complete engine fuel tank Secondly Slim Line Muffler fine engine installation should modified install right angles Beside looking much better muffler can re main engine during assembly removal cowling Viewed side modified muffler appears position imitates air inlet dummy engine Thirdly very realistic looking lens landing lights can made about five minutes Simply acquire pair plastic egg containers wife girl friend has purchased two pair Leggs panty hose Use largest end egg scribe required diameter circle inside spinning small compass Using pair scissors cut crack ing inscribed circle Attach lenses landing lights Pliobond cement record landing lights black dress up piano wire landing gear decided use large size straight plastic soda straws Short pieces black neoprene tubing Sullivan split snapped around wire concentrically space ends split plastic soda straws conceal split straws two concentric straws used splits oriented 1800 apart wire outside split can covered TYPICAL AILERO*J1NSTA L-A ON xX-x 35 length invisible Scotch tape fore after painting Likewise ends can retained wrap same tape Tests proved tape could doped fact dope will stay tape little loss gloss whereas dope may tend flake off smooth plastic straws flexed Sanding straws lightly roughen surface helps flight straws fly off Since Olco struts larger decided use cut off plastic barrel sec tions black felt pens sections pens split lengthwise means Xacto saw snapped over piano wire Concentric spacing accomplished build-up split neoprene tubing Axial shift pieces pens prevented Goo cement rubber like modelers cement author also applies prevent wheel colars com ing off etc preparation flying landing lights scale engine cowl re moved pair 3-in diameter wheels 13-5 propeller installed model balanced 12 ounces lead two 6 ounce sinkers engine mount moved CG forward about 30% location general everything done compen sate unwanted torque effects assure model would fly tail heavy Now happiest reward ing part test flights prototype Frank Stanton friend fellow club member agreed serve test pilot club field Johnsville NADC Warminster PA first check flight complete success Indications less ballast could have used trim adjustments required 50% left rudder trim 100% up elevator trim means transmitter trim ad justments airplane flew well trim changes surfaces second flight became stunt flight Would believe Frank flew large portion rolling circle Barring low sun position Frank probably would have gone way around Allowing fact model being flown very capable flier observers noted excellent manner Pitcairn Mailwing responded flight After test flights Franks comments Its good flying airplane Its piece cake fly next flying session Pitcairn Mailwing flown dressed-up inflight pictures time ballast weight reduced about 8 ounces Two flights flown shoot takeoff fly-by landing pictures surpris ing model did roll fast cause ailerons lower wing no differential utilized Aileron turns good turns made using rudder resulted loss al titude unusual Indications smooth grass fly ing fields would preferable hard sur face runways agreement ground handling original airplane flown landing lights scale engine cowl configuration tends protect damage should ground loop occur propeller sur vived two ground loops hard runways final note author has recently purchased Giant Round Balloons made Mexico distributed through World Toy House balloons look very promising use making large en gine cowls easy-does-it method course modelers should overlook possibility obtaining suitable balloons Hobbypoxy people origi nated method RC Aerobatics/Van Putte continued page 28 does guarantee Novice pattern tro phy enough good fliers around have make very difficult great flier win sport airplane several ways proceed al leviating situation have pitfalls will probably take grass roots movement have much effect pattern flying since major changes rules very infrequent unless widespread demonstration need desire change Contest Di rectors will have make decisions offer competition line proposed rule changes see work out National Society Radio Controlled Aerobatics NS RCA can strong fac tor proposed rule changes NSRCA district vice presidents should given feedback proposed changes issues can aired K Factor monthly newsletter NSRCA arent already NSRCA member send $10 1979 dues Mrs Sally Brown Secretary Treasurer 8534 Huddleston Drive Cincinnati OH 45236 thing has tried Con test Directors contests around coun try has introduction special Novice class beginners pattern com petition large contests have 96 Model Aviation LARGESMALL fit saafoces 1/8 thicker