NO OCR TEXT NO OCR TEXT Top Scale-like engine cowl large canopy greater average fuselage depth pro vide approach realism Left Rudder bar right pic short pushrod servo cables rudder Above right Goldberg re tract nose gear installation rear firewall Retract 180-degree servo rear first bulk headdirect connecting rod betweensteering pushrod alongside Right Compare view tail surface actuation black white pic bottom view thick rudder wide fiberglass cloth bandage wrapped cemented around wing center sec tion using either polyester resin epoxy keeping mind resin erodes foam fiberglass will require some sanding blending filler its edges installation Goldberg retracts demands close attention instruction sheet music wire gear legs given set rearward direction assure wheels will fit wells after few hard landings instruction sheet specifies small hole operating 1 2 Model Aviation FULL SIZE PLANS AVAILABLE . SEE PAGE 128 pushrod drawing calls full tapering solution depth slot needed assembly Ailerons uniform thickness throughout length tapered narrow toward wing tip because possibility flutter high speeds springy constant chord type used should hard material Extreme flutter can hazardous ailerons soft enough twist Fuselage Some building practices fuselage may seem unorthodox Onesixteenth plywood used sides top rear bulkhead some formers much stronger a weighs about same Wherever thicker plywood speci fied itwas laminated layers 1/16 produce material greater strength standard 5-ply Decks nose section covered 1/32 plywood stronger balsa planking requires sealer color coats fine finish Block balsa used compound curves bottom nose section fiberglass nose cowl could August 1979 13 ____---.- WTh 6 ---------.ASEL SPORT 1- -________ 1 1 ARIEL SPORT .. F20 F22 F 17 F3 I/B PLYMXD COWL BACK F16 FORMED OVER BALSA OR FOAM CORE- REMED 3/32 PLYWO COWL cOVERING l/3 PLYWCOD HATCH TOP F5 KRAFT I2OZ TANK FIBERGLASS COWLING F4 l/4PLYWcOD FIREWALL 23/4 DA SPINNER SHORTENED SIG ALUMINUM ENGINE MOUNT 3A6 PLYWOOD BULKHEAD F 3 1/8 PLYWOOD COWL MOUNP CARL GOLDBERG TRI GEAR RETRACT MECHANISM W5 WING FILLET 1/16 PLYWOOD OVER 3/32BALSA LINER AROUND WHEEL WELL K SERO ON F 5 CONTROLS NOSE GEAR RETRACT I/I6X FORM BLOCKS 2 2 3/4 DIA MAIN WHEELS 2 2 1/2 DIA NOSE WHEEL 14 Modei Aviation I/I F19 F23 F15 3/8 BASS SERVO TRAY SUPPOR1 I/4PLYVOD CANC SUPPORT F8 3/16X I/2HATCH RAILS WEBRA 60 BLACK HEAD 2i 1 F1\ WING LE DOWEL 2 NOSE GEAR cOVER HATCH AND FRONT ANCHOR SCR/S 1/32 PLYWOOD COVER 4BALSA FIN LE/2 BALSA TIPS/8 X /4 RUDDER E 3/32BALSA FIN IBS1/4 HARD BALSA FIN SR 3/4 BALSA BLOCK DORSAL1/2 BALSA RUDDER SPAR FILLER BLOCK I 3/32 BALSA RIBS V2 SOFT BALSA BASE ACRYLIC SHEET 1G CArJOPY7iiiPJ TFORMED OR 1/2 BALSA SHEET ELEViIORS IA6 PLYWXJD OF LONGERONS PLYW0D DECK3/32 BALSA I/8SQ STRIPS FORMERS BEVELED BALSA F 6 TO F K -I 1/16 SHEET BALSA OVER FOCM 95/16 MED5/16SQSPRUCE SPAR5/8 BALSAT1P 1/4 3JFT BALSA BOTTOM1/4 SQ BALSA LONGERONS AND CROSS BRACES / I.1/8 MED BALSA SIDE PLANKING I/16PLvVKDD INSIDE DOUBLER TO FIREWALL I/8PLWCCO RUDDER BAR ON 1/4 PLYWCD BRACKET 3/850 MAPLE LG BEAMS WITH T-NUTS BASSvOJD WING MOUNT BLOCK AND NYLON SCREW 2 3/32 r&JSIC WIRE THRU BRASS TUBE TO AILERONS GLASS CLOTH OVER MID SECTION ONLY 5/16 X 1/2 HARDWCOD SPAR K HARD BALSA AILERONS p 1 1/16 WIRE L G RETRACT LINKAGE 4-40 SCREWS RENE RETRACT COVER ERG RETRT NISM MAINS 1/2 X TAPERED LEADING EDGE 3/32 SHEET PLANK TOP AND BOTTOMFOAM CORE 1/4 BALSA HOLLOWED FOR WING TIPS August 1979 15 Offset muffler adapter trick lower engine below top line cowl Note aluminum engine mount has trimmed fit shape cowl bulkhead below made conventional plaster mold cause its shape would have locked mold carved scrap block balsa made 1/16 inch undersize dimensions covered several layers fiberglass cloth epoxy polyester resin balsa hollowed out completely leaving fiberglass shell used small sanding drum electric drill quickly grind away balsa An alternate method carve sand shape foam plastic such remnants wing foam covered fiberglass epoxy polyester foam dissolved solvent lacquer thinner dope thinner methyl ethyl ketone leaving shell wood bulkhead epoxy glued rear cowl add stiffness serve mount drawing shows home-made en gine mount muffler adapter adapter cut angle permits mounting engine 15 degrees above horizontal straight adapter found mufflers would require angle increased about 30 degrees engine cylinder projects greater distance above cowl top reason angled adapter drawing engine mount bulkhead shows both 15- 30-degree hole loca Continued Goldberg retract mechanism foam wing hardwood rails Styrene plastic gear cover removed above Note hardwood tapped dowels epoxied wing cover hold-downs Close attention such extra refinements contributes feeling scale enhanced acrobatic ship 16 Model Aviation Fuel tank easily accessible cover removed Tank packed foam plastic forvibration insulation Small balsa ledges glued cover opening leveling cover Right Notched support aileron servo permits access mounting screws 180-degree retract servo Note disc output retract servo insure positive locking mechanism Arm-type out-put will flex break Doing things right avoids annoying troubles ThicK ruuoer nas plywooa norns ana sTranded steel wires controlneat light installa tion Elevator horn exposed convenient adjustment could hidden inside fuselage Dual elevator horns recommend split flip pers large orfast aircraftto avoid uneven responses introduce rolling moment KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals 10- 6 9- 7 Nashville Slow Rat 8- 8 Gillopt 8 8 Regular 8- 7 Regular 7 6 7 55 $650 $650 $500 $475 $475 $375 Graphite $500 - 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 TEAM RACE PROPS DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP lw/out counter balence Fiber $400 Graphite $500 DIESEL HEADS fit 15 engines $18 ORDER DlRECT 72 hour shipping cashiers checks money orders 10-day person al checks Money promptly refunded prop stock KELLY PRODUCTS INC P0 Box 38 Western Springs IL 60558 104 Model Aviation vide small portions time day presently 128 pages magazine staff consists five full-time nearly others AMA HQ also help outto equal almost 214 full-timers Schroder eve can finance prolect must cost ex cess $200000 nine months unfulfilled subscriptions Fact Income avail able unfilled subscriptions 1975 advertising etc amounted $204424 costs including printing salaries rent telephone etc came $201394for sur plus profit just over $3000 Schroder agic basis [$200000] figure costs fixed publisher am well aware what will chart An 80-page book 40000 circulation will cost mini mum $17000 printed will require $1500 worth typesetting $3500 2nd class postagefulfillment subscription costs include preparation cheshire strips $1000 editorial content fees $2500 Fact MA cir culation 40000 1975 closer 50000 Schroder way off cases actual averages print ing $11062 typesetting $1014 postage $1113 labels $445 editorial fees $3684 could person field years actually using same printer MA far off Amazing Schroder He [the AMA Executive Direc tor] says can print cheaper used conservative figures estimate Fact AMA Executive Direc tors cost figures based MA pub lishers gathering cost information coincided actual results Consider Walts motive 1975 professed m interests AMAto save extinction lack growth unaffordable magazine costs recom mendation kill magazine Consider Walt published readers letter early 1979 considering compensat ing income factors suggested wrongly MA used general AMA dues money magazine should killed newsletter substituted Walt published letter suppos edly right AMA members know didnt deliver promise print other AMAs side story lat est message its apparent still wants MA killedbut new reasoning faulty old Ariel Sport/Wischer continued page 16 tions aluminum engine mounts Other holes will affected fuel line muffler pressure line throttle pushrod Since fuselage bulk heads needed before fuselage construc tion can begin hole locations must decided upon Laminate fuselage sides 1/16 ply wood a using contact adhesive right side has cut-out muffler space Add -square balsa bracing fuselage rear preference sequence steps construction begins 1/16 plywood fuselage top adding i beveled balsa strips bulkheads F5 FlO followed prepared fuselage sides Add F2 F4 lower balsa nose blocks nose formers F 15 thru F24 including cover frame Follow tail post -sq cross bracing fuselage bottom top formers F6 thru F 14 -square cement strips -square former brace Make heavy paper templates plywood deck nose section assure good fit plywood soaked water its outer surface make pliable can easily formed around formers fastened place white glue Have plentiful supply heavy number 62 64 rubber bands hand applying pressure glue sets perfect joint necessity can easily leveled later Epoxolite care must exercised certain ply firm contact formers plywood covering process much easier appears description ease maintenance prefer make fu& tank nose-gear retract mechanism accessible removable covers bit forethought has already paid dividends cleaning adjustment Goldberg retract mechanism has quite free maintenance problems once ad justed according instructions es pecially locking down avoid gear collapsing landing Having broken sev eral servo output arms have switched discs would recommend some means adjusting pushrod length bend wire length brass tube soldered over break wire canopy shown fabricated 1/32 acrylic sheet Plexiglas stretch formed after heating kitchen oven 2500 F balsa form leftover previous plane windshield portion drape formed oven over aluminum sheet bent desired shape 15-in-long canopy lighter material approximately equal size available Sig Tail surfaces Stabilizer foam core cut templates hot-wire technique foam halves epoxy glued center covered 1/16 sheet balsa piece tip tip continuous sheet cover provides stronger center Leading trailing edges added sanded airfoil section shape Vertical fin built up ribs covered 1/16 sheet balsa rudder has open rib construction requiring silk plas tic film cover reduce weight weight saving tail rudder operated means steel control-line cable full-size planes could changed pushrod option builder Elevator controlled l pushrod brought out nylon elevator horn through fuselage side improved appearance horn could have metal brazed music wire elevator joiner center done clevis hole horn should 1 inch joiner wire Finishing Being old school RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1 /83/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE -$1000 PER SPOOL PPD IN US ADDITIONAL SPOOLS $950 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1400 PER HANK PPD IN US ADDITIONAL HANKS $1350 SOLE US DISTRIBUTOR AND WORLD WIDE SALES FAIModl Supply P0 Box 9778 Phoenix Arizona 85068 aircraft finishing continue use silk dope because like toughness strength resistance dents scratches ever structure does need added strength plastic film covering could used equal success make no effort obtain super finish complete struc ture given three heavy brushed coats clear dope minimum thinner added Silk applied wet over balsa surfaces plywood silk given five six brushed coats clear dope followed two coats very thin dope talcum powder mixture filler mixture contains too little thinner filler becomes difficult sand too much talc used finish will reticulate crack will also difficult sand because loads sand paper Using number 150 grade open-coat aluminum oxide paper talc will removed sanding leaving pores silk filled silk grain will plainly visible Two coats clear will seal talc prevent its bleeding through final color coats clear coats can either brushed sprayed Color coats follow use spray light finish Color used hide surface blemishes should non existent after talc sanding Since color adds weight keep color coats light density Plywood surfaces fiber glass cowl need minimum preparation Flying Check correct center gravity plane needed no addition weight its first flight also needed no trim change Retracting landing gear will have greater effect expected because large wheels contribute drag plane doesnt really need retracts could easily converted rigid gear substituting hardwood mounts wings stand ard tricycle nose gear Takeoff landing real pleasure nose gear length shown touch up elevator takeoff speed lifts nose gracefully tendency jump off As plane approaches ground landing up elevator fed gradually holding nose up touch-down rear wheels first no tendency wing tip drop during type landing used scale-like performance reduce speed minimum impact Control surface travel side cen ter follows elevator 11/16 aileron 3/16 rudder 1W low travel elevator aileron contributing fac tors smooth handling enjoy Ariel Sport Elevator needs travel sufficient amount lower tail takeoff landing aileron travel indicated plane will axial roll less two seconds wide rudder travel used execution stall turns Spins snap-roll maneuvers positive both entry recovery Inverted flight requires bit down elevator held really enjoy flying plane think will too RC Technique/Myers continued page 23 receiver Ordinarily servo hooked up active system doing nothing will draw between 5 15 ma will jump up something like 250 ma move stick transmitter servo able move freely servo trying work against hinges have accidently epoxied together current will go higher usually some between 400 500 ma servo needs cleaning will draw current usual doing nothing Thats because dirty servos usually jitter shiver about transmitter Most trans mitters use some kind special charging plug thats hard find expensive Therefore easiest thing cut wires charger clip meter before thing about approach unsatisfactory have re connect cut ends restore normal operation Since probably wont measuring transmitter charging current very often because wont tell much just solder cut ends together again cover piece tape will take time measure charging currents system new write measured values owners manual will some value checking time time current will drop below normal values August 1979 105 Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage Et handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 W WI MODEL ACCESSORIES FINE QUALITY ENGINE KITS & CYLINDERS MACHINE GUN KITS LS TS INGS SEND SOt FOR COMPLETE CATALOG DEPr MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA S 92069 [F Cuts Coverite gj4& Monokote better T other lade Lasts much CURVED MIC PROTECTSMCOVER &TABLETOPLETS YOU 8LAOE CARRY TRIMIT IN YOUR POCKET cells start drying out sign old age same reduction occurs have dirty connections fractured wires charg ing ioop other hand current will increase bit event have short-circuited cell somewhere pack Transmitters frequently operate long periods two shorted cells because resulting voltage loss doesnt reduce signal output critical level dont measure charging current about notice transmitter has charged frequently personal opinion charger should have reliable ammeter reason dont have cost cheap meters cost real money Since us have charger best alternative buy VOM make up handful adapters like described Thats month Keep letters coming George Myers 70 Froehlich Farm Rd Hicks yule NY 11801 ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new Pclass model designed ce mind has potential win toughest COnl-p-eIitrO-tr THE POTENT30 Deluse kit features include Rolled balsa tusela e wing mount dt Completed prop nose plu9 tail plug & rudder Precut wing ribsapar notches job rated balsa strips Highest quality tissue lubed contest rubber Detailed instructions flying tips help yoa wiel CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE N08 SACTO CALIF 95821 RC Soaring/Pruss Continued page 25 types thermal fliers well should noted wing root faced plywood another plywood rib three inches outboard provide support 5mm ID tubing accommodates main support wire three-function gliderrudder elevator moveable wingsnot ailerons moveable wings idea nothing new Bob Boucher ASW couple years back same function did others tried sake doing Some systems straight-forward others looked like innards slot machine French bird simple like things appear simple theyre result refinements Such case Axel Jean Claude Bosquet current French aerobatic champion refined design what see result four years development fuselage although aesthetically sleek appearance has flat sides parallel 1 Fiberglass fin Ipart fuselage 2 1/16 Plywood Stiffen fin expoxy 3 1/16VVireepoxy 4 1/l6VVireepoxv wire makes contact fin 5 1/16 Plywood drill out 3&4 6 Balsa rudder place 3 Ii II ii 4 1 0 5 B flatness ends trailing edge wing meets flatness allows mechanics kept simple airfoil design changed fuselage wing fillet giving away However having fillet fuselage tends weak wing trailing juncture Bosquet cleverly reinforced fuselage point epoxying plywood ring fuselage might seem like simple solution treating vulnerable spot Ive seen some filletless home designs werent beefed up area wing tip used first point touch-down trailing edge knifed fuselage leaving field repair made heart models wing moving ability lies specially molded bell cranks Bosquet developed Again simpleafter see themthey mount fuselage pivot common wire diameter Drive pins stick out fuselage slip wings just about two-thirds back leading edge wings held close fuselage onto wires rubber bands attached screw-in hooks wing roots rubber bands stretch behind main support rod point wing pivot thereby restricting wing movement provide wing fuselage clearance main support tube extends beyond fuselage sides 1/32 inch ends fuselage wing tubes provide al frictionless pivot point Slick As thermal competition fliers real ize reducing drag means time air know real hat sucker thermal will get ten-minute maxes manhole covers its dead air sleekness can mean seconds minutes sleekness means no ugly protuberances wide gaps can cause turbulence Sloppy fits around canopy fuselages can cost time Wide gaps just plain gaps around fuselage wing joints can induce drag point its worse doubling cross-section fuselage point dirtiest areas aerodynamically speaking sailplanes tail area its flying 106 Model Aviation
Edition: Model Aviation - 1979/08
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 104, 105, 106
NO OCR TEXT NO OCR TEXT Top Scale-like engine cowl large canopy greater average fuselage depth pro vide approach realism Left Rudder bar right pic short pushrod servo cables rudder Above right Goldberg re tract nose gear installation rear firewall Retract 180-degree servo rear first bulk headdirect connecting rod betweensteering pushrod alongside Right Compare view tail surface actuation black white pic bottom view thick rudder wide fiberglass cloth bandage wrapped cemented around wing center sec tion using either polyester resin epoxy keeping mind resin erodes foam fiberglass will require some sanding blending filler its edges installation Goldberg retracts demands close attention instruction sheet music wire gear legs given set rearward direction assure wheels will fit wells after few hard landings instruction sheet specifies small hole operating 1 2 Model Aviation FULL SIZE PLANS AVAILABLE . SEE PAGE 128 pushrod drawing calls full tapering solution depth slot needed assembly Ailerons uniform thickness throughout length tapered narrow toward wing tip because possibility flutter high speeds springy constant chord type used should hard material Extreme flutter can hazardous ailerons soft enough twist Fuselage Some building practices fuselage may seem unorthodox Onesixteenth plywood used sides top rear bulkhead some formers much stronger a weighs about same Wherever thicker plywood speci fied itwas laminated layers 1/16 produce material greater strength standard 5-ply Decks nose section covered 1/32 plywood stronger balsa planking requires sealer color coats fine finish Block balsa used compound curves bottom nose section fiberglass nose cowl could August 1979 13 ____---.- WTh 6 ---------.ASEL SPORT 1- -________ 1 1 ARIEL SPORT .. F20 F22 F 17 F3 I/B PLYMXD COWL BACK F16 FORMED OVER BALSA OR FOAM CORE- REMED 3/32 PLYWO COWL cOVERING l/3 PLYWCOD HATCH TOP F5 KRAFT I2OZ TANK FIBERGLASS COWLING F4 l/4PLYWcOD FIREWALL 23/4 DA SPINNER SHORTENED SIG ALUMINUM ENGINE MOUNT 3A6 PLYWOOD BULKHEAD F 3 1/8 PLYWOOD COWL MOUNP CARL GOLDBERG TRI GEAR RETRACT MECHANISM W5 WING FILLET 1/16 PLYWOOD OVER 3/32BALSA LINER AROUND WHEEL WELL K SERO ON F 5 CONTROLS NOSE GEAR RETRACT I/I6X FORM BLOCKS 2 2 3/4 DIA MAIN WHEELS 2 2 1/2 DIA NOSE WHEEL 14 Modei Aviation I/I F19 F23 F15 3/8 BASS SERVO TRAY SUPPOR1 I/4PLYVOD CANC SUPPORT F8 3/16X I/2HATCH RAILS WEBRA 60 BLACK HEAD 2i 1 F1\ WING LE DOWEL 2 NOSE GEAR cOVER HATCH AND FRONT ANCHOR SCR/S 1/32 PLYWOOD COVER 4BALSA FIN LE/2 BALSA TIPS/8 X /4 RUDDER E 3/32BALSA FIN IBS1/4 HARD BALSA FIN SR 3/4 BALSA BLOCK DORSAL1/2 BALSA RUDDER SPAR FILLER BLOCK I 3/32 BALSA RIBS V2 SOFT BALSA BASE ACRYLIC SHEET 1G CArJOPY7iiiPJ TFORMED OR 1/2 BALSA SHEET ELEViIORS IA6 PLYWXJD OF LONGERONS PLYW0D DECK3/32 BALSA I/8SQ STRIPS FORMERS BEVELED BALSA F 6 TO F K -I 1/16 SHEET BALSA OVER FOCM 95/16 MED5/16SQSPRUCE SPAR5/8 BALSAT1P 1/4 3JFT BALSA BOTTOM1/4 SQ BALSA LONGERONS AND CROSS BRACES / I.1/8 MED BALSA SIDE PLANKING I/16PLvVKDD INSIDE DOUBLER TO FIREWALL I/8PLWCCO RUDDER BAR ON 1/4 PLYWCD BRACKET 3/850 MAPLE LG BEAMS WITH T-NUTS BASSvOJD WING MOUNT BLOCK AND NYLON SCREW 2 3/32 r&JSIC WIRE THRU BRASS TUBE TO AILERONS GLASS CLOTH OVER MID SECTION ONLY 5/16 X 1/2 HARDWCOD SPAR K HARD BALSA AILERONS p 1 1/16 WIRE L G RETRACT LINKAGE 4-40 SCREWS RENE RETRACT COVER ERG RETRT NISM MAINS 1/2 X TAPERED LEADING EDGE 3/32 SHEET PLANK TOP AND BOTTOMFOAM CORE 1/4 BALSA HOLLOWED FOR WING TIPS August 1979 15 Offset muffler adapter trick lower engine below top line cowl Note aluminum engine mount has trimmed fit shape cowl bulkhead below made conventional plaster mold cause its shape would have locked mold carved scrap block balsa made 1/16 inch undersize dimensions covered several layers fiberglass cloth epoxy polyester resin balsa hollowed out completely leaving fiberglass shell used small sanding drum electric drill quickly grind away balsa An alternate method carve sand shape foam plastic such remnants wing foam covered fiberglass epoxy polyester foam dissolved solvent lacquer thinner dope thinner methyl ethyl ketone leaving shell wood bulkhead epoxy glued rear cowl add stiffness serve mount drawing shows home-made en gine mount muffler adapter adapter cut angle permits mounting engine 15 degrees above horizontal straight adapter found mufflers would require angle increased about 30 degrees engine cylinder projects greater distance above cowl top reason angled adapter drawing engine mount bulkhead shows both 15- 30-degree hole loca Continued Goldberg retract mechanism foam wing hardwood rails Styrene plastic gear cover removed above Note hardwood tapped dowels epoxied wing cover hold-downs Close attention such extra refinements contributes feeling scale enhanced acrobatic ship 16 Model Aviation Fuel tank easily accessible cover removed Tank packed foam plastic forvibration insulation Small balsa ledges glued cover opening leveling cover Right Notched support aileron servo permits access mounting screws 180-degree retract servo Note disc output retract servo insure positive locking mechanism Arm-type out-put will flex break Doing things right avoids annoying troubles ThicK ruuoer nas plywooa norns ana sTranded steel wires controlneat light installa tion Elevator horn exposed convenient adjustment could hidden inside fuselage Dual elevator horns recommend split flip pers large orfast aircraftto avoid uneven responses introduce rolling moment KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals 10- 6 9- 7 Nashville Slow Rat 8- 8 Gillopt 8 8 Regular 8- 7 Regular 7 6 7 55 $650 $650 $500 $475 $475 $375 Graphite $500 - 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 TEAM RACE PROPS DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP lw/out counter balence Fiber $400 Graphite $500 DIESEL HEADS fit 15 engines $18 ORDER DlRECT 72 hour shipping cashiers checks money orders 10-day person al checks Money promptly refunded prop stock KELLY PRODUCTS INC P0 Box 38 Western Springs IL 60558 104 Model Aviation vide small portions time day presently 128 pages magazine staff consists five full-time nearly others AMA HQ also help outto equal almost 214 full-timers Schroder eve can finance prolect must cost ex cess $200000 nine months unfulfilled subscriptions Fact Income avail able unfilled subscriptions 1975 advertising etc amounted $204424 costs including printing salaries rent telephone etc came $201394for sur plus profit just over $3000 Schroder agic basis [$200000] figure costs fixed publisher am well aware what will chart An 80-page book 40000 circulation will cost mini mum $17000 printed will require $1500 worth typesetting $3500 2nd class postagefulfillment subscription costs include preparation cheshire strips $1000 editorial content fees $2500 Fact MA cir culation 40000 1975 closer 50000 Schroder way off cases actual averages print ing $11062 typesetting $1014 postage $1113 labels $445 editorial fees $3684 could person field years actually using same printer MA far off Amazing Schroder He [the AMA Executive Direc tor] says can print cheaper used conservative figures estimate Fact AMA Executive Direc tors cost figures based MA pub lishers gathering cost information coincided actual results Consider Walts motive 1975 professed m interests AMAto save extinction lack growth unaffordable magazine costs recom mendation kill magazine Consider Walt published readers letter early 1979 considering compensat ing income factors suggested wrongly MA used general AMA dues money magazine should killed newsletter substituted Walt published letter suppos edly right AMA members know didnt deliver promise print other AMAs side story lat est message its apparent still wants MA killedbut new reasoning faulty old Ariel Sport/Wischer continued page 16 tions aluminum engine mounts Other holes will affected fuel line muffler pressure line throttle pushrod Since fuselage bulk heads needed before fuselage construc tion can begin hole locations must decided upon Laminate fuselage sides 1/16 ply wood a using contact adhesive right side has cut-out muffler space Add -square balsa bracing fuselage rear preference sequence steps construction begins 1/16 plywood fuselage top adding i beveled balsa strips bulkheads F5 FlO followed prepared fuselage sides Add F2 F4 lower balsa nose blocks nose formers F 15 thru F24 including cover frame Follow tail post -sq cross bracing fuselage bottom top formers F6 thru F 14 -square cement strips -square former brace Make heavy paper templates plywood deck nose section assure good fit plywood soaked water its outer surface make pliable can easily formed around formers fastened place white glue Have plentiful supply heavy number 62 64 rubber bands hand applying pressure glue sets perfect joint necessity can easily leveled later Epoxolite care must exercised certain ply firm contact formers plywood covering process much easier appears description ease maintenance prefer make fu& tank nose-gear retract mechanism accessible removable covers bit forethought has already paid dividends cleaning adjustment Goldberg retract mechanism has quite free maintenance problems once ad justed according instructions es pecially locking down avoid gear collapsing landing Having broken sev eral servo output arms have switched discs would recommend some means adjusting pushrod length bend wire length brass tube soldered over break wire canopy shown fabricated 1/32 acrylic sheet Plexiglas stretch formed after heating kitchen oven 2500 F balsa form leftover previous plane windshield portion drape formed oven over aluminum sheet bent desired shape 15-in-long canopy lighter material approximately equal size available Sig Tail surfaces Stabilizer foam core cut templates hot-wire technique foam halves epoxy glued center covered 1/16 sheet balsa piece tip tip continuous sheet cover provides stronger center Leading trailing edges added sanded airfoil section shape Vertical fin built up ribs covered 1/16 sheet balsa rudder has open rib construction requiring silk plas tic film cover reduce weight weight saving tail rudder operated means steel control-line cable full-size planes could changed pushrod option builder Elevator controlled l pushrod brought out nylon elevator horn through fuselage side improved appearance horn could have metal brazed music wire elevator joiner center done clevis hole horn should 1 inch joiner wire Finishing Being old school RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1 /83/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE -$1000 PER SPOOL PPD IN US ADDITIONAL SPOOLS $950 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1400 PER HANK PPD IN US ADDITIONAL HANKS $1350 SOLE US DISTRIBUTOR AND WORLD WIDE SALES FAIModl Supply P0 Box 9778 Phoenix Arizona 85068 aircraft finishing continue use silk dope because like toughness strength resistance dents scratches ever structure does need added strength plastic film covering could used equal success make no effort obtain super finish complete struc ture given three heavy brushed coats clear dope minimum thinner added Silk applied wet over balsa surfaces plywood silk given five six brushed coats clear dope followed two coats very thin dope talcum powder mixture filler mixture contains too little thinner filler becomes difficult sand too much talc used finish will reticulate crack will also difficult sand because loads sand paper Using number 150 grade open-coat aluminum oxide paper talc will removed sanding leaving pores silk filled silk grain will plainly visible Two coats clear will seal talc prevent its bleeding through final color coats clear coats can either brushed sprayed Color coats follow use spray light finish Color used hide surface blemishes should non existent after talc sanding Since color adds weight keep color coats light density Plywood surfaces fiber glass cowl need minimum preparation Flying Check correct center gravity plane needed no addition weight its first flight also needed no trim change Retracting landing gear will have greater effect expected because large wheels contribute drag plane doesnt really need retracts could easily converted rigid gear substituting hardwood mounts wings stand ard tricycle nose gear Takeoff landing real pleasure nose gear length shown touch up elevator takeoff speed lifts nose gracefully tendency jump off As plane approaches ground landing up elevator fed gradually holding nose up touch-down rear wheels first no tendency wing tip drop during type landing used scale-like performance reduce speed minimum impact Control surface travel side cen ter follows elevator 11/16 aileron 3/16 rudder 1W low travel elevator aileron contributing fac tors smooth handling enjoy Ariel Sport Elevator needs travel sufficient amount lower tail takeoff landing aileron travel indicated plane will axial roll less two seconds wide rudder travel used execution stall turns Spins snap-roll maneuvers positive both entry recovery Inverted flight requires bit down elevator held really enjoy flying plane think will too RC Technique/Myers continued page 23 receiver Ordinarily servo hooked up active system doing nothing will draw between 5 15 ma will jump up something like 250 ma move stick transmitter servo able move freely servo trying work against hinges have accidently epoxied together current will go higher usually some between 400 500 ma servo needs cleaning will draw current usual doing nothing Thats because dirty servos usually jitter shiver about transmitter Most trans mitters use some kind special charging plug thats hard find expensive Therefore easiest thing cut wires charger clip meter before thing about approach unsatisfactory have re connect cut ends restore normal operation Since probably wont measuring transmitter charging current very often because wont tell much just solder cut ends together again cover piece tape will take time measure charging currents system new write measured values owners manual will some value checking time time current will drop below normal values August 1979 105 Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage Et handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 W WI MODEL ACCESSORIES FINE QUALITY ENGINE KITS & CYLINDERS MACHINE GUN KITS LS TS INGS SEND SOt FOR COMPLETE CATALOG DEPr MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA S 92069 [F Cuts Coverite gj4& Monokote better T other lade Lasts much CURVED MIC PROTECTSMCOVER &TABLETOPLETS YOU 8LAOE CARRY TRIMIT IN YOUR POCKET cells start drying out sign old age same reduction occurs have dirty connections fractured wires charg ing ioop other hand current will increase bit event have short-circuited cell somewhere pack Transmitters frequently operate long periods two shorted cells because resulting voltage loss doesnt reduce signal output critical level dont measure charging current about notice transmitter has charged frequently personal opinion charger should have reliable ammeter reason dont have cost cheap meters cost real money Since us have charger best alternative buy VOM make up handful adapters like described Thats month Keep letters coming George Myers 70 Froehlich Farm Rd Hicks yule NY 11801 ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new Pclass model designed ce mind has potential win toughest COnl-p-eIitrO-tr THE POTENT30 Deluse kit features include Rolled balsa tusela e wing mount dt Completed prop nose plu9 tail plug & rudder Precut wing ribsapar notches job rated balsa strips Highest quality tissue lubed contest rubber Detailed instructions flying tips help yoa wiel CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE N08 SACTO CALIF 95821 RC Soaring/Pruss Continued page 25 types thermal fliers well should noted wing root faced plywood another plywood rib three inches outboard provide support 5mm ID tubing accommodates main support wire three-function gliderrudder elevator moveable wingsnot ailerons moveable wings idea nothing new Bob Boucher ASW couple years back same function did others tried sake doing Some systems straight-forward others looked like innards slot machine French bird simple like things appear simple theyre result refinements Such case Axel Jean Claude Bosquet current French aerobatic champion refined design what see result four years development fuselage although aesthetically sleek appearance has flat sides parallel 1 Fiberglass fin Ipart fuselage 2 1/16 Plywood Stiffen fin expoxy 3 1/16VVireepoxy 4 1/l6VVireepoxv wire makes contact fin 5 1/16 Plywood drill out 3&4 6 Balsa rudder place 3 Ii II ii 4 1 0 5 B flatness ends trailing edge wing meets flatness allows mechanics kept simple airfoil design changed fuselage wing fillet giving away However having fillet fuselage tends weak wing trailing juncture Bosquet cleverly reinforced fuselage point epoxying plywood ring fuselage might seem like simple solution treating vulnerable spot Ive seen some filletless home designs werent beefed up area wing tip used first point touch-down trailing edge knifed fuselage leaving field repair made heart models wing moving ability lies specially molded bell cranks Bosquet developed Again simpleafter see themthey mount fuselage pivot common wire diameter Drive pins stick out fuselage slip wings just about two-thirds back leading edge wings held close fuselage onto wires rubber bands attached screw-in hooks wing roots rubber bands stretch behind main support rod point wing pivot thereby restricting wing movement provide wing fuselage clearance main support tube extends beyond fuselage sides 1/32 inch ends fuselage wing tubes provide al frictionless pivot point Slick As thermal competition fliers real ize reducing drag means time air know real hat sucker thermal will get ten-minute maxes manhole covers its dead air sleekness can mean seconds minutes sleekness means no ugly protuberances wide gaps can cause turbulence Sloppy fits around canopy fuselages can cost time Wide gaps just plain gaps around fuselage wing joints can induce drag point its worse doubling cross-section fuselage point dirtiest areas aerodynamically speaking sailplanes tail area its flying 106 Model Aviation
Edition: Model Aviation - 1979/08
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 104, 105, 106
NO OCR TEXT NO OCR TEXT Top Scale-like engine cowl large canopy greater average fuselage depth pro vide approach realism Left Rudder bar right pic short pushrod servo cables rudder Above right Goldberg re tract nose gear installation rear firewall Retract 180-degree servo rear first bulk headdirect connecting rod betweensteering pushrod alongside Right Compare view tail surface actuation black white pic bottom view thick rudder wide fiberglass cloth bandage wrapped cemented around wing center sec tion using either polyester resin epoxy keeping mind resin erodes foam fiberglass will require some sanding blending filler its edges installation Goldberg retracts demands close attention instruction sheet music wire gear legs given set rearward direction assure wheels will fit wells after few hard landings instruction sheet specifies small hole operating 1 2 Model Aviation FULL SIZE PLANS AVAILABLE . SEE PAGE 128 pushrod drawing calls full tapering solution depth slot needed assembly Ailerons uniform thickness throughout length tapered narrow toward wing tip because possibility flutter high speeds springy constant chord type used should hard material Extreme flutter can hazardous ailerons soft enough twist Fuselage Some building practices fuselage may seem unorthodox Onesixteenth plywood used sides top rear bulkhead some formers much stronger a weighs about same Wherever thicker plywood speci fied itwas laminated layers 1/16 produce material greater strength standard 5-ply Decks nose section covered 1/32 plywood stronger balsa planking requires sealer color coats fine finish Block balsa used compound curves bottom nose section fiberglass nose cowl could August 1979 13 ____---.- WTh 6 ---------.ASEL SPORT 1- -________ 1 1 ARIEL SPORT .. F20 F22 F 17 F3 I/B PLYMXD COWL BACK F16 FORMED OVER BALSA OR FOAM CORE- REMED 3/32 PLYWO COWL cOVERING l/3 PLYWCOD HATCH TOP F5 KRAFT I2OZ TANK FIBERGLASS COWLING F4 l/4PLYWcOD FIREWALL 23/4 DA SPINNER SHORTENED SIG ALUMINUM ENGINE MOUNT 3A6 PLYWOOD BULKHEAD F 3 1/8 PLYWOOD COWL MOUNP CARL GOLDBERG TRI GEAR RETRACT MECHANISM W5 WING FILLET 1/16 PLYWOOD OVER 3/32BALSA LINER AROUND WHEEL WELL K SERO ON F 5 CONTROLS NOSE GEAR RETRACT I/I6X FORM BLOCKS 2 2 3/4 DIA MAIN WHEELS 2 2 1/2 DIA NOSE WHEEL 14 Modei Aviation I/I F19 F23 F15 3/8 BASS SERVO TRAY SUPPOR1 I/4PLYVOD CANC SUPPORT F8 3/16X I/2HATCH RAILS WEBRA 60 BLACK HEAD 2i 1 F1\ WING LE DOWEL 2 NOSE GEAR cOVER HATCH AND FRONT ANCHOR SCR/S 1/32 PLYWOOD COVER 4BALSA FIN LE/2 BALSA TIPS/8 X /4 RUDDER E 3/32BALSA FIN IBS1/4 HARD BALSA FIN SR 3/4 BALSA BLOCK DORSAL1/2 BALSA RUDDER SPAR FILLER BLOCK I 3/32 BALSA RIBS V2 SOFT BALSA BASE ACRYLIC SHEET 1G CArJOPY7iiiPJ TFORMED OR 1/2 BALSA SHEET ELEViIORS IA6 PLYWXJD OF LONGERONS PLYW0D DECK3/32 BALSA I/8SQ STRIPS FORMERS BEVELED BALSA F 6 TO F K -I 1/16 SHEET BALSA OVER FOCM 95/16 MED5/16SQSPRUCE SPAR5/8 BALSAT1P 1/4 3JFT BALSA BOTTOM1/4 SQ BALSA LONGERONS AND CROSS BRACES / I.1/8 MED BALSA SIDE PLANKING I/16PLvVKDD INSIDE DOUBLER TO FIREWALL I/8PLWCCO RUDDER BAR ON 1/4 PLYWCD BRACKET 3/850 MAPLE LG BEAMS WITH T-NUTS BASSvOJD WING MOUNT BLOCK AND NYLON SCREW 2 3/32 r&JSIC WIRE THRU BRASS TUBE TO AILERONS GLASS CLOTH OVER MID SECTION ONLY 5/16 X 1/2 HARDWCOD SPAR K HARD BALSA AILERONS p 1 1/16 WIRE L G RETRACT LINKAGE 4-40 SCREWS RENE RETRACT COVER ERG RETRT NISM MAINS 1/2 X TAPERED LEADING EDGE 3/32 SHEET PLANK TOP AND BOTTOMFOAM CORE 1/4 BALSA HOLLOWED FOR WING TIPS August 1979 15 Offset muffler adapter trick lower engine below top line cowl Note aluminum engine mount has trimmed fit shape cowl bulkhead below made conventional plaster mold cause its shape would have locked mold carved scrap block balsa made 1/16 inch undersize dimensions covered several layers fiberglass cloth epoxy polyester resin balsa hollowed out completely leaving fiberglass shell used small sanding drum electric drill quickly grind away balsa An alternate method carve sand shape foam plastic such remnants wing foam covered fiberglass epoxy polyester foam dissolved solvent lacquer thinner dope thinner methyl ethyl ketone leaving shell wood bulkhead epoxy glued rear cowl add stiffness serve mount drawing shows home-made en gine mount muffler adapter adapter cut angle permits mounting engine 15 degrees above horizontal straight adapter found mufflers would require angle increased about 30 degrees engine cylinder projects greater distance above cowl top reason angled adapter drawing engine mount bulkhead shows both 15- 30-degree hole loca Continued Goldberg retract mechanism foam wing hardwood rails Styrene plastic gear cover removed above Note hardwood tapped dowels epoxied wing cover hold-downs Close attention such extra refinements contributes feeling scale enhanced acrobatic ship 16 Model Aviation Fuel tank easily accessible cover removed Tank packed foam plastic forvibration insulation Small balsa ledges glued cover opening leveling cover Right Notched support aileron servo permits access mounting screws 180-degree retract servo Note disc output retract servo insure positive locking mechanism Arm-type out-put will flex break Doing things right avoids annoying troubles ThicK ruuoer nas plywooa norns ana sTranded steel wires controlneat light installa tion Elevator horn exposed convenient adjustment could hidden inside fuselage Dual elevator horns recommend split flip pers large orfast aircraftto avoid uneven responses introduce rolling moment KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals 10- 6 9- 7 Nashville Slow Rat 8- 8 Gillopt 8 8 Regular 8- 7 Regular 7 6 7 55 $650 $650 $500 $475 $475 $375 Graphite $500 - 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 TEAM RACE PROPS DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP lw/out counter balence Fiber $400 Graphite $500 DIESEL HEADS fit 15 engines $18 ORDER DlRECT 72 hour shipping cashiers checks money orders 10-day person al checks Money promptly refunded prop stock KELLY PRODUCTS INC P0 Box 38 Western Springs IL 60558 104 Model Aviation vide small portions time day presently 128 pages magazine staff consists five full-time nearly others AMA HQ also help outto equal almost 214 full-timers Schroder eve can finance prolect must cost ex cess $200000 nine months unfulfilled subscriptions Fact Income avail able unfilled subscriptions 1975 advertising etc amounted $204424 costs including printing salaries rent telephone etc came $201394for sur plus profit just over $3000 Schroder agic basis [$200000] figure costs fixed publisher am well aware what will chart An 80-page book 40000 circulation will cost mini mum $17000 printed will require $1500 worth typesetting $3500 2nd class postagefulfillment subscription costs include preparation cheshire strips $1000 editorial content fees $2500 Fact MA cir culation 40000 1975 closer 50000 Schroder way off cases actual averages print ing $11062 typesetting $1014 postage $1113 labels $445 editorial fees $3684 could person field years actually using same printer MA far off Amazing Schroder He [the AMA Executive Direc tor] says can print cheaper used conservative figures estimate Fact AMA Executive Direc tors cost figures based MA pub lishers gathering cost information coincided actual results Consider Walts motive 1975 professed m interests AMAto save extinction lack growth unaffordable magazine costs recom mendation kill magazine Consider Walt published readers letter early 1979 considering compensat ing income factors suggested wrongly MA used general AMA dues money magazine should killed newsletter substituted Walt published letter suppos edly right AMA members know didnt deliver promise print other AMAs side story lat est message its apparent still wants MA killedbut new reasoning faulty old Ariel Sport/Wischer continued page 16 tions aluminum engine mounts Other holes will affected fuel line muffler pressure line throttle pushrod Since fuselage bulk heads needed before fuselage construc tion can begin hole locations must decided upon Laminate fuselage sides 1/16 ply wood a using contact adhesive right side has cut-out muffler space Add -square balsa bracing fuselage rear preference sequence steps construction begins 1/16 plywood fuselage top adding i beveled balsa strips bulkheads F5 FlO followed prepared fuselage sides Add F2 F4 lower balsa nose blocks nose formers F 15 thru F24 including cover frame Follow tail post -sq cross bracing fuselage bottom top formers F6 thru F 14 -square cement strips -square former brace Make heavy paper templates plywood deck nose section assure good fit plywood soaked water its outer surface make pliable can easily formed around formers fastened place white glue Have plentiful supply heavy number 62 64 rubber bands hand applying pressure glue sets perfect joint necessity can easily leveled later Epoxolite care must exercised certain ply firm contact formers plywood covering process much easier appears description ease maintenance prefer make fu& tank nose-gear retract mechanism accessible removable covers bit forethought has already paid dividends cleaning adjustment Goldberg retract mechanism has quite free maintenance problems once ad justed according instructions es pecially locking down avoid gear collapsing landing Having broken sev eral servo output arms have switched discs would recommend some means adjusting pushrod length bend wire length brass tube soldered over break wire canopy shown fabricated 1/32 acrylic sheet Plexiglas stretch formed after heating kitchen oven 2500 F balsa form leftover previous plane windshield portion drape formed oven over aluminum sheet bent desired shape 15-in-long canopy lighter material approximately equal size available Sig Tail surfaces Stabilizer foam core cut templates hot-wire technique foam halves epoxy glued center covered 1/16 sheet balsa piece tip tip continuous sheet cover provides stronger center Leading trailing edges added sanded airfoil section shape Vertical fin built up ribs covered 1/16 sheet balsa rudder has open rib construction requiring silk plas tic film cover reduce weight weight saving tail rudder operated means steel control-line cable full-size planes could changed pushrod option builder Elevator controlled l pushrod brought out nylon elevator horn through fuselage side improved appearance horn could have metal brazed music wire elevator joiner center done clevis hole horn should 1 inch joiner wire Finishing Being old school RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1 /83/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE -$1000 PER SPOOL PPD IN US ADDITIONAL SPOOLS $950 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1400 PER HANK PPD IN US ADDITIONAL HANKS $1350 SOLE US DISTRIBUTOR AND WORLD WIDE SALES FAIModl Supply P0 Box 9778 Phoenix Arizona 85068 aircraft finishing continue use silk dope because like toughness strength resistance dents scratches ever structure does need added strength plastic film covering could used equal success make no effort obtain super finish complete struc ture given three heavy brushed coats clear dope minimum thinner added Silk applied wet over balsa surfaces plywood silk given five six brushed coats clear dope followed two coats very thin dope talcum powder mixture filler mixture contains too little thinner filler becomes difficult sand too much talc used finish will reticulate crack will also difficult sand because loads sand paper Using number 150 grade open-coat aluminum oxide paper talc will removed sanding leaving pores silk filled silk grain will plainly visible Two coats clear will seal talc prevent its bleeding through final color coats clear coats can either brushed sprayed Color coats follow use spray light finish Color used hide surface blemishes should non existent after talc sanding Since color adds weight keep color coats light density Plywood surfaces fiber glass cowl need minimum preparation Flying Check correct center gravity plane needed no addition weight its first flight also needed no trim change Retracting landing gear will have greater effect expected because large wheels contribute drag plane doesnt really need retracts could easily converted rigid gear substituting hardwood mounts wings stand ard tricycle nose gear Takeoff landing real pleasure nose gear length shown touch up elevator takeoff speed lifts nose gracefully tendency jump off As plane approaches ground landing up elevator fed gradually holding nose up touch-down rear wheels first no tendency wing tip drop during type landing used scale-like performance reduce speed minimum impact Control surface travel side cen ter follows elevator 11/16 aileron 3/16 rudder 1W low travel elevator aileron contributing fac tors smooth handling enjoy Ariel Sport Elevator needs travel sufficient amount lower tail takeoff landing aileron travel indicated plane will axial roll less two seconds wide rudder travel used execution stall turns Spins snap-roll maneuvers positive both entry recovery Inverted flight requires bit down elevator held really enjoy flying plane think will too RC Technique/Myers continued page 23 receiver Ordinarily servo hooked up active system doing nothing will draw between 5 15 ma will jump up something like 250 ma move stick transmitter servo able move freely servo trying work against hinges have accidently epoxied together current will go higher usually some between 400 500 ma servo needs cleaning will draw current usual doing nothing Thats because dirty servos usually jitter shiver about transmitter Most trans mitters use some kind special charging plug thats hard find expensive Therefore easiest thing cut wires charger clip meter before thing about approach unsatisfactory have re connect cut ends restore normal operation Since probably wont measuring transmitter charging current very often because wont tell much just solder cut ends together again cover piece tape will take time measure charging currents system new write measured values owners manual will some value checking time time current will drop below normal values August 1979 105 Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage Et handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 W WI MODEL ACCESSORIES FINE QUALITY ENGINE KITS & CYLINDERS MACHINE GUN KITS LS TS INGS SEND SOt FOR COMPLETE CATALOG DEPr MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA S 92069 [F Cuts Coverite gj4& Monokote better T other lade Lasts much CURVED MIC PROTECTSMCOVER &TABLETOPLETS YOU 8LAOE CARRY TRIMIT IN YOUR POCKET cells start drying out sign old age same reduction occurs have dirty connections fractured wires charg ing ioop other hand current will increase bit event have short-circuited cell somewhere pack Transmitters frequently operate long periods two shorted cells because resulting voltage loss doesnt reduce signal output critical level dont measure charging current about notice transmitter has charged frequently personal opinion charger should have reliable ammeter reason dont have cost cheap meters cost real money Since us have charger best alternative buy VOM make up handful adapters like described Thats month Keep letters coming George Myers 70 Froehlich Farm Rd Hicks yule NY 11801 ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new Pclass model designed ce mind has potential win toughest COnl-p-eIitrO-tr THE POTENT30 Deluse kit features include Rolled balsa tusela e wing mount dt Completed prop nose plu9 tail plug & rudder Precut wing ribsapar notches job rated balsa strips Highest quality tissue lubed contest rubber Detailed instructions flying tips help yoa wiel CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE N08 SACTO CALIF 95821 RC Soaring/Pruss Continued page 25 types thermal fliers well should noted wing root faced plywood another plywood rib three inches outboard provide support 5mm ID tubing accommodates main support wire three-function gliderrudder elevator moveable wingsnot ailerons moveable wings idea nothing new Bob Boucher ASW couple years back same function did others tried sake doing Some systems straight-forward others looked like innards slot machine French bird simple like things appear simple theyre result refinements Such case Axel Jean Claude Bosquet current French aerobatic champion refined design what see result four years development fuselage although aesthetically sleek appearance has flat sides parallel 1 Fiberglass fin Ipart fuselage 2 1/16 Plywood Stiffen fin expoxy 3 1/16VVireepoxy 4 1/l6VVireepoxv wire makes contact fin 5 1/16 Plywood drill out 3&4 6 Balsa rudder place 3 Ii II ii 4 1 0 5 B flatness ends trailing edge wing meets flatness allows mechanics kept simple airfoil design changed fuselage wing fillet giving away However having fillet fuselage tends weak wing trailing juncture Bosquet cleverly reinforced fuselage point epoxying plywood ring fuselage might seem like simple solution treating vulnerable spot Ive seen some filletless home designs werent beefed up area wing tip used first point touch-down trailing edge knifed fuselage leaving field repair made heart models wing moving ability lies specially molded bell cranks Bosquet developed Again simpleafter see themthey mount fuselage pivot common wire diameter Drive pins stick out fuselage slip wings just about two-thirds back leading edge wings held close fuselage onto wires rubber bands attached screw-in hooks wing roots rubber bands stretch behind main support rod point wing pivot thereby restricting wing movement provide wing fuselage clearance main support tube extends beyond fuselage sides 1/32 inch ends fuselage wing tubes provide al frictionless pivot point Slick As thermal competition fliers real ize reducing drag means time air know real hat sucker thermal will get ten-minute maxes manhole covers its dead air sleekness can mean seconds minutes sleekness means no ugly protuberances wide gaps can cause turbulence Sloppy fits around canopy fuselages can cost time Wide gaps just plain gaps around fuselage wing joints can induce drag point its worse doubling cross-section fuselage point dirtiest areas aerodynamically speaking sailplanes tail area its flying 106 Model Aviation
Edition: Model Aviation - 1979/08
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 104, 105, 106
NO OCR TEXT NO OCR TEXT Top Scale-like engine cowl large canopy greater average fuselage depth pro vide approach realism Left Rudder bar right pic short pushrod servo cables rudder Above right Goldberg re tract nose gear installation rear firewall Retract 180-degree servo rear first bulk headdirect connecting rod betweensteering pushrod alongside Right Compare view tail surface actuation black white pic bottom view thick rudder wide fiberglass cloth bandage wrapped cemented around wing center sec tion using either polyester resin epoxy keeping mind resin erodes foam fiberglass will require some sanding blending filler its edges installation Goldberg retracts demands close attention instruction sheet music wire gear legs given set rearward direction assure wheels will fit wells after few hard landings instruction sheet specifies small hole operating 1 2 Model Aviation FULL SIZE PLANS AVAILABLE . SEE PAGE 128 pushrod drawing calls full tapering solution depth slot needed assembly Ailerons uniform thickness throughout length tapered narrow toward wing tip because possibility flutter high speeds springy constant chord type used should hard material Extreme flutter can hazardous ailerons soft enough twist Fuselage Some building practices fuselage may seem unorthodox Onesixteenth plywood used sides top rear bulkhead some formers much stronger a weighs about same Wherever thicker plywood speci fied itwas laminated layers 1/16 produce material greater strength standard 5-ply Decks nose section covered 1/32 plywood stronger balsa planking requires sealer color coats fine finish Block balsa used compound curves bottom nose section fiberglass nose cowl could August 1979 13 ____---.- WTh 6 ---------.ASEL SPORT 1- -________ 1 1 ARIEL SPORT .. F20 F22 F 17 F3 I/B PLYMXD COWL BACK F16 FORMED OVER BALSA OR FOAM CORE- REMED 3/32 PLYWO COWL cOVERING l/3 PLYWCOD HATCH TOP F5 KRAFT I2OZ TANK FIBERGLASS COWLING F4 l/4PLYWcOD FIREWALL 23/4 DA SPINNER SHORTENED SIG ALUMINUM ENGINE MOUNT 3A6 PLYWOOD BULKHEAD F 3 1/8 PLYWOOD COWL MOUNP CARL GOLDBERG TRI GEAR RETRACT MECHANISM W5 WING FILLET 1/16 PLYWOOD OVER 3/32BALSA LINER AROUND WHEEL WELL K SERO ON F 5 CONTROLS NOSE GEAR RETRACT I/I6X FORM BLOCKS 2 2 3/4 DIA MAIN WHEELS 2 2 1/2 DIA NOSE WHEEL 14 Modei Aviation I/I F19 F23 F15 3/8 BASS SERVO TRAY SUPPOR1 I/4PLYVOD CANC SUPPORT F8 3/16X I/2HATCH RAILS WEBRA 60 BLACK HEAD 2i 1 F1\ WING LE DOWEL 2 NOSE GEAR cOVER HATCH AND FRONT ANCHOR SCR/S 1/32 PLYWOOD COVER 4BALSA FIN LE/2 BALSA TIPS/8 X /4 RUDDER E 3/32BALSA FIN IBS1/4 HARD BALSA FIN SR 3/4 BALSA BLOCK DORSAL1/2 BALSA RUDDER SPAR FILLER BLOCK I 3/32 BALSA RIBS V2 SOFT BALSA BASE ACRYLIC SHEET 1G CArJOPY7iiiPJ TFORMED OR 1/2 BALSA SHEET ELEViIORS IA6 PLYWXJD OF LONGERONS PLYW0D DECK3/32 BALSA I/8SQ STRIPS FORMERS BEVELED BALSA F 6 TO F K -I 1/16 SHEET BALSA OVER FOCM 95/16 MED5/16SQSPRUCE SPAR5/8 BALSAT1P 1/4 3JFT BALSA BOTTOM1/4 SQ BALSA LONGERONS AND CROSS BRACES / I.1/8 MED BALSA SIDE PLANKING I/16PLvVKDD INSIDE DOUBLER TO FIREWALL I/8PLWCCO RUDDER BAR ON 1/4 PLYWCD BRACKET 3/850 MAPLE LG BEAMS WITH T-NUTS BASSvOJD WING MOUNT BLOCK AND NYLON SCREW 2 3/32 r&JSIC WIRE THRU BRASS TUBE TO AILERONS GLASS CLOTH OVER MID SECTION ONLY 5/16 X 1/2 HARDWCOD SPAR K HARD BALSA AILERONS p 1 1/16 WIRE L G RETRACT LINKAGE 4-40 SCREWS RENE RETRACT COVER ERG RETRT NISM MAINS 1/2 X TAPERED LEADING EDGE 3/32 SHEET PLANK TOP AND BOTTOMFOAM CORE 1/4 BALSA HOLLOWED FOR WING TIPS August 1979 15 Offset muffler adapter trick lower engine below top line cowl Note aluminum engine mount has trimmed fit shape cowl bulkhead below made conventional plaster mold cause its shape would have locked mold carved scrap block balsa made 1/16 inch undersize dimensions covered several layers fiberglass cloth epoxy polyester resin balsa hollowed out completely leaving fiberglass shell used small sanding drum electric drill quickly grind away balsa An alternate method carve sand shape foam plastic such remnants wing foam covered fiberglass epoxy polyester foam dissolved solvent lacquer thinner dope thinner methyl ethyl ketone leaving shell wood bulkhead epoxy glued rear cowl add stiffness serve mount drawing shows home-made en gine mount muffler adapter adapter cut angle permits mounting engine 15 degrees above horizontal straight adapter found mufflers would require angle increased about 30 degrees engine cylinder projects greater distance above cowl top reason angled adapter drawing engine mount bulkhead shows both 15- 30-degree hole loca Continued Goldberg retract mechanism foam wing hardwood rails Styrene plastic gear cover removed above Note hardwood tapped dowels epoxied wing cover hold-downs Close attention such extra refinements contributes feeling scale enhanced acrobatic ship 16 Model Aviation Fuel tank easily accessible cover removed Tank packed foam plastic forvibration insulation Small balsa ledges glued cover opening leveling cover Right Notched support aileron servo permits access mounting screws 180-degree retract servo Note disc output retract servo insure positive locking mechanism Arm-type out-put will flex break Doing things right avoids annoying troubles ThicK ruuoer nas plywooa norns ana sTranded steel wires controlneat light installa tion Elevator horn exposed convenient adjustment could hidden inside fuselage Dual elevator horns recommend split flip pers large orfast aircraftto avoid uneven responses introduce rolling moment KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals 10- 6 9- 7 Nashville Slow Rat 8- 8 Gillopt 8 8 Regular 8- 7 Regular 7 6 7 55 $650 $650 $500 $475 $475 $375 Graphite $500 - 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 TEAM RACE PROPS DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP lw/out counter balence Fiber $400 Graphite $500 DIESEL HEADS fit 15 engines $18 ORDER DlRECT 72 hour shipping cashiers checks money orders 10-day person al checks Money promptly refunded prop stock KELLY PRODUCTS INC P0 Box 38 Western Springs IL 60558 104 Model Aviation vide small portions time day presently 128 pages magazine staff consists five full-time nearly others AMA HQ also help outto equal almost 214 full-timers Schroder eve can finance prolect must cost ex cess $200000 nine months unfulfilled subscriptions Fact Income avail able unfilled subscriptions 1975 advertising etc amounted $204424 costs including printing salaries rent telephone etc came $201394for sur plus profit just over $3000 Schroder agic basis [$200000] figure costs fixed publisher am well aware what will chart An 80-page book 40000 circulation will cost mini mum $17000 printed will require $1500 worth typesetting $3500 2nd class postagefulfillment subscription costs include preparation cheshire strips $1000 editorial content fees $2500 Fact MA cir culation 40000 1975 closer 50000 Schroder way off cases actual averages print ing $11062 typesetting $1014 postage $1113 labels $445 editorial fees $3684 could person field years actually using same printer MA far off Amazing Schroder He [the AMA Executive Direc tor] says can print cheaper used conservative figures estimate Fact AMA Executive Direc tors cost figures based MA pub lishers gathering cost information coincided actual results Consider Walts motive 1975 professed m interests AMAto save extinction lack growth unaffordable magazine costs recom mendation kill magazine Consider Walt published readers letter early 1979 considering compensat ing income factors suggested wrongly MA used general AMA dues money magazine should killed newsletter substituted Walt published letter suppos edly right AMA members know didnt deliver promise print other AMAs side story lat est message its apparent still wants MA killedbut new reasoning faulty old Ariel Sport/Wischer continued page 16 tions aluminum engine mounts Other holes will affected fuel line muffler pressure line throttle pushrod Since fuselage bulk heads needed before fuselage construc tion can begin hole locations must decided upon Laminate fuselage sides 1/16 ply wood a using contact adhesive right side has cut-out muffler space Add -square balsa bracing fuselage rear preference sequence steps construction begins 1/16 plywood fuselage top adding i beveled balsa strips bulkheads F5 FlO followed prepared fuselage sides Add F2 F4 lower balsa nose blocks nose formers F 15 thru F24 including cover frame Follow tail post -sq cross bracing fuselage bottom top formers F6 thru F 14 -square cement strips -square former brace Make heavy paper templates plywood deck nose section assure good fit plywood soaked water its outer surface make pliable can easily formed around formers fastened place white glue Have plentiful supply heavy number 62 64 rubber bands hand applying pressure glue sets perfect joint necessity can easily leveled later Epoxolite care must exercised certain ply firm contact formers plywood covering process much easier appears description ease maintenance prefer make fu& tank nose-gear retract mechanism accessible removable covers bit forethought has already paid dividends cleaning adjustment Goldberg retract mechanism has quite free maintenance problems once ad justed according instructions es pecially locking down avoid gear collapsing landing Having broken sev eral servo output arms have switched discs would recommend some means adjusting pushrod length bend wire length brass tube soldered over break wire canopy shown fabricated 1/32 acrylic sheet Plexiglas stretch formed after heating kitchen oven 2500 F balsa form leftover previous plane windshield portion drape formed oven over aluminum sheet bent desired shape 15-in-long canopy lighter material approximately equal size available Sig Tail surfaces Stabilizer foam core cut templates hot-wire technique foam halves epoxy glued center covered 1/16 sheet balsa piece tip tip continuous sheet cover provides stronger center Leading trailing edges added sanded airfoil section shape Vertical fin built up ribs covered 1/16 sheet balsa rudder has open rib construction requiring silk plas tic film cover reduce weight weight saving tail rudder operated means steel control-line cable full-size planes could changed pushrod option builder Elevator controlled l pushrod brought out nylon elevator horn through fuselage side improved appearance horn could have metal brazed music wire elevator joiner center done clevis hole horn should 1 inch joiner wire Finishing Being old school RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1 /83/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE -$1000 PER SPOOL PPD IN US ADDITIONAL SPOOLS $950 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1400 PER HANK PPD IN US ADDITIONAL HANKS $1350 SOLE US DISTRIBUTOR AND WORLD WIDE SALES FAIModl Supply P0 Box 9778 Phoenix Arizona 85068 aircraft finishing continue use silk dope because like toughness strength resistance dents scratches ever structure does need added strength plastic film covering could used equal success make no effort obtain super finish complete struc ture given three heavy brushed coats clear dope minimum thinner added Silk applied wet over balsa surfaces plywood silk given five six brushed coats clear dope followed two coats very thin dope talcum powder mixture filler mixture contains too little thinner filler becomes difficult sand too much talc used finish will reticulate crack will also difficult sand because loads sand paper Using number 150 grade open-coat aluminum oxide paper talc will removed sanding leaving pores silk filled silk grain will plainly visible Two coats clear will seal talc prevent its bleeding through final color coats clear coats can either brushed sprayed Color coats follow use spray light finish Color used hide surface blemishes should non existent after talc sanding Since color adds weight keep color coats light density Plywood surfaces fiber glass cowl need minimum preparation Flying Check correct center gravity plane needed no addition weight its first flight also needed no trim change Retracting landing gear will have greater effect expected because large wheels contribute drag plane doesnt really need retracts could easily converted rigid gear substituting hardwood mounts wings stand ard tricycle nose gear Takeoff landing real pleasure nose gear length shown touch up elevator takeoff speed lifts nose gracefully tendency jump off As plane approaches ground landing up elevator fed gradually holding nose up touch-down rear wheels first no tendency wing tip drop during type landing used scale-like performance reduce speed minimum impact Control surface travel side cen ter follows elevator 11/16 aileron 3/16 rudder 1W low travel elevator aileron contributing fac tors smooth handling enjoy Ariel Sport Elevator needs travel sufficient amount lower tail takeoff landing aileron travel indicated plane will axial roll less two seconds wide rudder travel used execution stall turns Spins snap-roll maneuvers positive both entry recovery Inverted flight requires bit down elevator held really enjoy flying plane think will too RC Technique/Myers continued page 23 receiver Ordinarily servo hooked up active system doing nothing will draw between 5 15 ma will jump up something like 250 ma move stick transmitter servo able move freely servo trying work against hinges have accidently epoxied together current will go higher usually some between 400 500 ma servo needs cleaning will draw current usual doing nothing Thats because dirty servos usually jitter shiver about transmitter Most trans mitters use some kind special charging plug thats hard find expensive Therefore easiest thing cut wires charger clip meter before thing about approach unsatisfactory have re connect cut ends restore normal operation Since probably wont measuring transmitter charging current very often because wont tell much just solder cut ends together again cover piece tape will take time measure charging currents system new write measured values owners manual will some value checking time time current will drop below normal values August 1979 105 Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage Et handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 W WI MODEL ACCESSORIES FINE QUALITY ENGINE KITS & CYLINDERS MACHINE GUN KITS LS TS INGS SEND SOt FOR COMPLETE CATALOG DEPr MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA S 92069 [F Cuts Coverite gj4& Monokote better T other lade Lasts much CURVED MIC PROTECTSMCOVER &TABLETOPLETS YOU 8LAOE CARRY TRIMIT IN YOUR POCKET cells start drying out sign old age same reduction occurs have dirty connections fractured wires charg ing ioop other hand current will increase bit event have short-circuited cell somewhere pack Transmitters frequently operate long periods two shorted cells because resulting voltage loss doesnt reduce signal output critical level dont measure charging current about notice transmitter has charged frequently personal opinion charger should have reliable ammeter reason dont have cost cheap meters cost real money Since us have charger best alternative buy VOM make up handful adapters like described Thats month Keep letters coming George Myers 70 Froehlich Farm Rd Hicks yule NY 11801 ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new Pclass model designed ce mind has potential win toughest COnl-p-eIitrO-tr THE POTENT30 Deluse kit features include Rolled balsa tusela e wing mount dt Completed prop nose plu9 tail plug & rudder Precut wing ribsapar notches job rated balsa strips Highest quality tissue lubed contest rubber Detailed instructions flying tips help yoa wiel CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE N08 SACTO CALIF 95821 RC Soaring/Pruss Continued page 25 types thermal fliers well should noted wing root faced plywood another plywood rib three inches outboard provide support 5mm ID tubing accommodates main support wire three-function gliderrudder elevator moveable wingsnot ailerons moveable wings idea nothing new Bob Boucher ASW couple years back same function did others tried sake doing Some systems straight-forward others looked like innards slot machine French bird simple like things appear simple theyre result refinements Such case Axel Jean Claude Bosquet current French aerobatic champion refined design what see result four years development fuselage although aesthetically sleek appearance has flat sides parallel 1 Fiberglass fin Ipart fuselage 2 1/16 Plywood Stiffen fin expoxy 3 1/16VVireepoxy 4 1/l6VVireepoxv wire makes contact fin 5 1/16 Plywood drill out 3&4 6 Balsa rudder place 3 Ii II ii 4 1 0 5 B flatness ends trailing edge wing meets flatness allows mechanics kept simple airfoil design changed fuselage wing fillet giving away However having fillet fuselage tends weak wing trailing juncture Bosquet cleverly reinforced fuselage point epoxying plywood ring fuselage might seem like simple solution treating vulnerable spot Ive seen some filletless home designs werent beefed up area wing tip used first point touch-down trailing edge knifed fuselage leaving field repair made heart models wing moving ability lies specially molded bell cranks Bosquet developed Again simpleafter see themthey mount fuselage pivot common wire diameter Drive pins stick out fuselage slip wings just about two-thirds back leading edge wings held close fuselage onto wires rubber bands attached screw-in hooks wing roots rubber bands stretch behind main support rod point wing pivot thereby restricting wing movement provide wing fuselage clearance main support tube extends beyond fuselage sides 1/32 inch ends fuselage wing tubes provide al frictionless pivot point Slick As thermal competition fliers real ize reducing drag means time air know real hat sucker thermal will get ten-minute maxes manhole covers its dead air sleekness can mean seconds minutes sleekness means no ugly protuberances wide gaps can cause turbulence Sloppy fits around canopy fuselages can cost time Wide gaps just plain gaps around fuselage wing joints can induce drag point its worse doubling cross-section fuselage point dirtiest areas aerodynamically speaking sailplanes tail area its flying 106 Model Aviation
Edition: Model Aviation - 1979/08
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 104, 105, 106
NO OCR TEXT NO OCR TEXT Top Scale-like engine cowl large canopy greater average fuselage depth pro vide approach realism Left Rudder bar right pic short pushrod servo cables rudder Above right Goldberg re tract nose gear installation rear firewall Retract 180-degree servo rear first bulk headdirect connecting rod betweensteering pushrod alongside Right Compare view tail surface actuation black white pic bottom view thick rudder wide fiberglass cloth bandage wrapped cemented around wing center sec tion using either polyester resin epoxy keeping mind resin erodes foam fiberglass will require some sanding blending filler its edges installation Goldberg retracts demands close attention instruction sheet music wire gear legs given set rearward direction assure wheels will fit wells after few hard landings instruction sheet specifies small hole operating 1 2 Model Aviation FULL SIZE PLANS AVAILABLE . SEE PAGE 128 pushrod drawing calls full tapering solution depth slot needed assembly Ailerons uniform thickness throughout length tapered narrow toward wing tip because possibility flutter high speeds springy constant chord type used should hard material Extreme flutter can hazardous ailerons soft enough twist Fuselage Some building practices fuselage may seem unorthodox Onesixteenth plywood used sides top rear bulkhead some formers much stronger a weighs about same Wherever thicker plywood speci fied itwas laminated layers 1/16 produce material greater strength standard 5-ply Decks nose section covered 1/32 plywood stronger balsa planking requires sealer color coats fine finish Block balsa used compound curves bottom nose section fiberglass nose cowl could August 1979 13 ____---.- WTh 6 ---------.ASEL SPORT 1- -________ 1 1 ARIEL SPORT .. F20 F22 F 17 F3 I/B PLYMXD COWL BACK F16 FORMED OVER BALSA OR FOAM CORE- REMED 3/32 PLYWO COWL cOVERING l/3 PLYWCOD HATCH TOP F5 KRAFT I2OZ TANK FIBERGLASS COWLING F4 l/4PLYWcOD FIREWALL 23/4 DA SPINNER SHORTENED SIG ALUMINUM ENGINE MOUNT 3A6 PLYWOOD BULKHEAD F 3 1/8 PLYWOOD COWL MOUNP CARL GOLDBERG TRI GEAR RETRACT MECHANISM W5 WING FILLET 1/16 PLYWOOD OVER 3/32BALSA LINER AROUND WHEEL WELL K SERO ON F 5 CONTROLS NOSE GEAR RETRACT I/I6X FORM BLOCKS 2 2 3/4 DIA MAIN WHEELS 2 2 1/2 DIA NOSE WHEEL 14 Modei Aviation I/I F19 F23 F15 3/8 BASS SERVO TRAY SUPPOR1 I/4PLYVOD CANC SUPPORT F8 3/16X I/2HATCH RAILS WEBRA 60 BLACK HEAD 2i 1 F1\ WING LE DOWEL 2 NOSE GEAR cOVER HATCH AND FRONT ANCHOR SCR/S 1/32 PLYWOOD COVER 4BALSA FIN LE/2 BALSA TIPS/8 X /4 RUDDER E 3/32BALSA FIN IBS1/4 HARD BALSA FIN SR 3/4 BALSA BLOCK DORSAL1/2 BALSA RUDDER SPAR FILLER BLOCK I 3/32 BALSA RIBS V2 SOFT BALSA BASE ACRYLIC SHEET 1G CArJOPY7iiiPJ TFORMED OR 1/2 BALSA SHEET ELEViIORS IA6 PLYWXJD OF LONGERONS PLYW0D DECK3/32 BALSA I/8SQ STRIPS FORMERS BEVELED BALSA F 6 TO F K -I 1/16 SHEET BALSA OVER FOCM 95/16 MED5/16SQSPRUCE SPAR5/8 BALSAT1P 1/4 3JFT BALSA BOTTOM1/4 SQ BALSA LONGERONS AND CROSS BRACES / I.1/8 MED BALSA SIDE PLANKING I/16PLvVKDD INSIDE DOUBLER TO FIREWALL I/8PLWCCO RUDDER BAR ON 1/4 PLYWCD BRACKET 3/850 MAPLE LG BEAMS WITH T-NUTS BASSvOJD WING MOUNT BLOCK AND NYLON SCREW 2 3/32 r&JSIC WIRE THRU BRASS TUBE TO AILERONS GLASS CLOTH OVER MID SECTION ONLY 5/16 X 1/2 HARDWCOD SPAR K HARD BALSA AILERONS p 1 1/16 WIRE L G RETRACT LINKAGE 4-40 SCREWS RENE RETRACT COVER ERG RETRT NISM MAINS 1/2 X TAPERED LEADING EDGE 3/32 SHEET PLANK TOP AND BOTTOMFOAM CORE 1/4 BALSA HOLLOWED FOR WING TIPS August 1979 15 Offset muffler adapter trick lower engine below top line cowl Note aluminum engine mount has trimmed fit shape cowl bulkhead below made conventional plaster mold cause its shape would have locked mold carved scrap block balsa made 1/16 inch undersize dimensions covered several layers fiberglass cloth epoxy polyester resin balsa hollowed out completely leaving fiberglass shell used small sanding drum electric drill quickly grind away balsa An alternate method carve sand shape foam plastic such remnants wing foam covered fiberglass epoxy polyester foam dissolved solvent lacquer thinner dope thinner methyl ethyl ketone leaving shell wood bulkhead epoxy glued rear cowl add stiffness serve mount drawing shows home-made en gine mount muffler adapter adapter cut angle permits mounting engine 15 degrees above horizontal straight adapter found mufflers would require angle increased about 30 degrees engine cylinder projects greater distance above cowl top reason angled adapter drawing engine mount bulkhead shows both 15- 30-degree hole loca Continued Goldberg retract mechanism foam wing hardwood rails Styrene plastic gear cover removed above Note hardwood tapped dowels epoxied wing cover hold-downs Close attention such extra refinements contributes feeling scale enhanced acrobatic ship 16 Model Aviation Fuel tank easily accessible cover removed Tank packed foam plastic forvibration insulation Small balsa ledges glued cover opening leveling cover Right Notched support aileron servo permits access mounting screws 180-degree retract servo Note disc output retract servo insure positive locking mechanism Arm-type out-put will flex break Doing things right avoids annoying troubles ThicK ruuoer nas plywooa norns ana sTranded steel wires controlneat light installa tion Elevator horn exposed convenient adjustment could hidden inside fuselage Dual elevator horns recommend split flip pers large orfast aircraftto avoid uneven responses introduce rolling moment KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals 10- 6 9- 7 Nashville Slow Rat 8- 8 Gillopt 8 8 Regular 8- 7 Regular 7 6 7 55 $650 $650 $500 $475 $475 $375 Graphite $500 - 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 TEAM RACE PROPS DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP lw/out counter balence Fiber $400 Graphite $500 DIESEL HEADS fit 15 engines $18 ORDER DlRECT 72 hour shipping cashiers checks money orders 10-day person al checks Money promptly refunded prop stock KELLY PRODUCTS INC P0 Box 38 Western Springs IL 60558 104 Model Aviation vide small portions time day presently 128 pages magazine staff consists five full-time nearly others AMA HQ also help outto equal almost 214 full-timers Schroder eve can finance prolect must cost ex cess $200000 nine months unfulfilled subscriptions Fact Income avail able unfilled subscriptions 1975 advertising etc amounted $204424 costs including printing salaries rent telephone etc came $201394for sur plus profit just over $3000 Schroder agic basis [$200000] figure costs fixed publisher am well aware what will chart An 80-page book 40000 circulation will cost mini mum $17000 printed will require $1500 worth typesetting $3500 2nd class postagefulfillment subscription costs include preparation cheshire strips $1000 editorial content fees $2500 Fact MA cir culation 40000 1975 closer 50000 Schroder way off cases actual averages print ing $11062 typesetting $1014 postage $1113 labels $445 editorial fees $3684 could person field years actually using same printer MA far off Amazing Schroder He [the AMA Executive Direc tor] says can print cheaper used conservative figures estimate Fact AMA Executive Direc tors cost figures based MA pub lishers gathering cost information coincided actual results Consider Walts motive 1975 professed m interests AMAto save extinction lack growth unaffordable magazine costs recom mendation kill magazine Consider Walt published readers letter early 1979 considering compensat ing income factors suggested wrongly MA used general AMA dues money magazine should killed newsletter substituted Walt published letter suppos edly right AMA members know didnt deliver promise print other AMAs side story lat est message its apparent still wants MA killedbut new reasoning faulty old Ariel Sport/Wischer continued page 16 tions aluminum engine mounts Other holes will affected fuel line muffler pressure line throttle pushrod Since fuselage bulk heads needed before fuselage construc tion can begin hole locations must decided upon Laminate fuselage sides 1/16 ply wood a using contact adhesive right side has cut-out muffler space Add -square balsa bracing fuselage rear preference sequence steps construction begins 1/16 plywood fuselage top adding i beveled balsa strips bulkheads F5 FlO followed prepared fuselage sides Add F2 F4 lower balsa nose blocks nose formers F 15 thru F24 including cover frame Follow tail post -sq cross bracing fuselage bottom top formers F6 thru F 14 -square cement strips -square former brace Make heavy paper templates plywood deck nose section assure good fit plywood soaked water its outer surface make pliable can easily formed around formers fastened place white glue Have plentiful supply heavy number 62 64 rubber bands hand applying pressure glue sets perfect joint necessity can easily leveled later Epoxolite care must exercised certain ply firm contact formers plywood covering process much easier appears description ease maintenance prefer make fu& tank nose-gear retract mechanism accessible removable covers bit forethought has already paid dividends cleaning adjustment Goldberg retract mechanism has quite free maintenance problems once ad justed according instructions es pecially locking down avoid gear collapsing landing Having broken sev eral servo output arms have switched discs would recommend some means adjusting pushrod length bend wire length brass tube soldered over break wire canopy shown fabricated 1/32 acrylic sheet Plexiglas stretch formed after heating kitchen oven 2500 F balsa form leftover previous plane windshield portion drape formed oven over aluminum sheet bent desired shape 15-in-long canopy lighter material approximately equal size available Sig Tail surfaces Stabilizer foam core cut templates hot-wire technique foam halves epoxy glued center covered 1/16 sheet balsa piece tip tip continuous sheet cover provides stronger center Leading trailing edges added sanded airfoil section shape Vertical fin built up ribs covered 1/16 sheet balsa rudder has open rib construction requiring silk plas tic film cover reduce weight weight saving tail rudder operated means steel control-line cable full-size planes could changed pushrod option builder Elevator controlled l pushrod brought out nylon elevator horn through fuselage side improved appearance horn could have metal brazed music wire elevator joiner center done clevis hole horn should 1 inch joiner wire Finishing Being old school RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1 /83/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE -$1000 PER SPOOL PPD IN US ADDITIONAL SPOOLS $950 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1400 PER HANK PPD IN US ADDITIONAL HANKS $1350 SOLE US DISTRIBUTOR AND WORLD WIDE SALES FAIModl Supply P0 Box 9778 Phoenix Arizona 85068 aircraft finishing continue use silk dope because like toughness strength resistance dents scratches ever structure does need added strength plastic film covering could used equal success make no effort obtain super finish complete struc ture given three heavy brushed coats clear dope minimum thinner added Silk applied wet over balsa surfaces plywood silk given five six brushed coats clear dope followed two coats very thin dope talcum powder mixture filler mixture contains too little thinner filler becomes difficult sand too much talc used finish will reticulate crack will also difficult sand because loads sand paper Using number 150 grade open-coat aluminum oxide paper talc will removed sanding leaving pores silk filled silk grain will plainly visible Two coats clear will seal talc prevent its bleeding through final color coats clear coats can either brushed sprayed Color coats follow use spray light finish Color used hide surface blemishes should non existent after talc sanding Since color adds weight keep color coats light density Plywood surfaces fiber glass cowl need minimum preparation Flying Check correct center gravity plane needed no addition weight its first flight also needed no trim change Retracting landing gear will have greater effect expected because large wheels contribute drag plane doesnt really need retracts could easily converted rigid gear substituting hardwood mounts wings stand ard tricycle nose gear Takeoff landing real pleasure nose gear length shown touch up elevator takeoff speed lifts nose gracefully tendency jump off As plane approaches ground landing up elevator fed gradually holding nose up touch-down rear wheels first no tendency wing tip drop during type landing used scale-like performance reduce speed minimum impact Control surface travel side cen ter follows elevator 11/16 aileron 3/16 rudder 1W low travel elevator aileron contributing fac tors smooth handling enjoy Ariel Sport Elevator needs travel sufficient amount lower tail takeoff landing aileron travel indicated plane will axial roll less two seconds wide rudder travel used execution stall turns Spins snap-roll maneuvers positive both entry recovery Inverted flight requires bit down elevator held really enjoy flying plane think will too RC Technique/Myers continued page 23 receiver Ordinarily servo hooked up active system doing nothing will draw between 5 15 ma will jump up something like 250 ma move stick transmitter servo able move freely servo trying work against hinges have accidently epoxied together current will go higher usually some between 400 500 ma servo needs cleaning will draw current usual doing nothing Thats because dirty servos usually jitter shiver about transmitter Most trans mitters use some kind special charging plug thats hard find expensive Therefore easiest thing cut wires charger clip meter before thing about approach unsatisfactory have re connect cut ends restore normal operation Since probably wont measuring transmitter charging current very often because wont tell much just solder cut ends together again cover piece tape will take time measure charging currents system new write measured values owners manual will some value checking time time current will drop below normal values August 1979 105 Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage Et handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 W WI MODEL ACCESSORIES FINE QUALITY ENGINE KITS & CYLINDERS MACHINE GUN KITS LS TS INGS SEND SOt FOR COMPLETE CATALOG DEPr MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA S 92069 [F Cuts Coverite gj4& Monokote better T other lade Lasts much CURVED MIC PROTECTSMCOVER &TABLETOPLETS YOU 8LAOE CARRY TRIMIT IN YOUR POCKET cells start drying out sign old age same reduction occurs have dirty connections fractured wires charg ing ioop other hand current will increase bit event have short-circuited cell somewhere pack Transmitters frequently operate long periods two shorted cells because resulting voltage loss doesnt reduce signal output critical level dont measure charging current about notice transmitter has charged frequently personal opinion charger should have reliable ammeter reason dont have cost cheap meters cost real money Since us have charger best alternative buy VOM make up handful adapters like described Thats month Keep letters coming George Myers 70 Froehlich Farm Rd Hicks yule NY 11801 ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new Pclass model designed ce mind has potential win toughest COnl-p-eIitrO-tr THE POTENT30 Deluse kit features include Rolled balsa tusela e wing mount dt Completed prop nose plu9 tail plug & rudder Precut wing ribsapar notches job rated balsa strips Highest quality tissue lubed contest rubber Detailed instructions flying tips help yoa wiel CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE N08 SACTO CALIF 95821 RC Soaring/Pruss Continued page 25 types thermal fliers well should noted wing root faced plywood another plywood rib three inches outboard provide support 5mm ID tubing accommodates main support wire three-function gliderrudder elevator moveable wingsnot ailerons moveable wings idea nothing new Bob Boucher ASW couple years back same function did others tried sake doing Some systems straight-forward others looked like innards slot machine French bird simple like things appear simple theyre result refinements Such case Axel Jean Claude Bosquet current French aerobatic champion refined design what see result four years development fuselage although aesthetically sleek appearance has flat sides parallel 1 Fiberglass fin Ipart fuselage 2 1/16 Plywood Stiffen fin expoxy 3 1/16VVireepoxy 4 1/l6VVireepoxv wire makes contact fin 5 1/16 Plywood drill out 3&4 6 Balsa rudder place 3 Ii II ii 4 1 0 5 B flatness ends trailing edge wing meets flatness allows mechanics kept simple airfoil design changed fuselage wing fillet giving away However having fillet fuselage tends weak wing trailing juncture Bosquet cleverly reinforced fuselage point epoxying plywood ring fuselage might seem like simple solution treating vulnerable spot Ive seen some filletless home designs werent beefed up area wing tip used first point touch-down trailing edge knifed fuselage leaving field repair made heart models wing moving ability lies specially molded bell cranks Bosquet developed Again simpleafter see themthey mount fuselage pivot common wire diameter Drive pins stick out fuselage slip wings just about two-thirds back leading edge wings held close fuselage onto wires rubber bands attached screw-in hooks wing roots rubber bands stretch behind main support rod point wing pivot thereby restricting wing movement provide wing fuselage clearance main support tube extends beyond fuselage sides 1/32 inch ends fuselage wing tubes provide al frictionless pivot point Slick As thermal competition fliers real ize reducing drag means time air know real hat sucker thermal will get ten-minute maxes manhole covers its dead air sleekness can mean seconds minutes sleekness means no ugly protuberances wide gaps can cause turbulence Sloppy fits around canopy fuselages can cost time Wide gaps just plain gaps around fuselage wing joints can induce drag point its worse doubling cross-section fuselage point dirtiest areas aerodynamically speaking sailplanes tail area its flying 106 Model Aviation
Edition: Model Aviation - 1979/08
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 104, 105, 106
NO OCR TEXT NO OCR TEXT Top Scale-like engine cowl large canopy greater average fuselage depth pro vide approach realism Left Rudder bar right pic short pushrod servo cables rudder Above right Goldberg re tract nose gear installation rear firewall Retract 180-degree servo rear first bulk headdirect connecting rod betweensteering pushrod alongside Right Compare view tail surface actuation black white pic bottom view thick rudder wide fiberglass cloth bandage wrapped cemented around wing center sec tion using either polyester resin epoxy keeping mind resin erodes foam fiberglass will require some sanding blending filler its edges installation Goldberg retracts demands close attention instruction sheet music wire gear legs given set rearward direction assure wheels will fit wells after few hard landings instruction sheet specifies small hole operating 1 2 Model Aviation FULL SIZE PLANS AVAILABLE . SEE PAGE 128 pushrod drawing calls full tapering solution depth slot needed assembly Ailerons uniform thickness throughout length tapered narrow toward wing tip because possibility flutter high speeds springy constant chord type used should hard material Extreme flutter can hazardous ailerons soft enough twist Fuselage Some building practices fuselage may seem unorthodox Onesixteenth plywood used sides top rear bulkhead some formers much stronger a weighs about same Wherever thicker plywood speci fied itwas laminated layers 1/16 produce material greater strength standard 5-ply Decks nose section covered 1/32 plywood stronger balsa planking requires sealer color coats fine finish Block balsa used compound curves bottom nose section fiberglass nose cowl could August 1979 13 ____---.- WTh 6 ---------.ASEL SPORT 1- -________ 1 1 ARIEL SPORT .. F20 F22 F 17 F3 I/B PLYMXD COWL BACK F16 FORMED OVER BALSA OR FOAM CORE- REMED 3/32 PLYWO COWL cOVERING l/3 PLYWCOD HATCH TOP F5 KRAFT I2OZ TANK FIBERGLASS COWLING F4 l/4PLYWcOD FIREWALL 23/4 DA SPINNER SHORTENED SIG ALUMINUM ENGINE MOUNT 3A6 PLYWOOD BULKHEAD F 3 1/8 PLYWOOD COWL MOUNP CARL GOLDBERG TRI GEAR RETRACT MECHANISM W5 WING FILLET 1/16 PLYWOOD OVER 3/32BALSA LINER AROUND WHEEL WELL K SERO ON F 5 CONTROLS NOSE GEAR RETRACT I/I6X FORM BLOCKS 2 2 3/4 DIA MAIN WHEELS 2 2 1/2 DIA NOSE WHEEL 14 Modei Aviation I/I F19 F23 F15 3/8 BASS SERVO TRAY SUPPOR1 I/4PLYVOD CANC SUPPORT F8 3/16X I/2HATCH RAILS WEBRA 60 BLACK HEAD 2i 1 F1\ WING LE DOWEL 2 NOSE GEAR cOVER HATCH AND FRONT ANCHOR SCR/S 1/32 PLYWOOD COVER 4BALSA FIN LE/2 BALSA TIPS/8 X /4 RUDDER E 3/32BALSA FIN IBS1/4 HARD BALSA FIN SR 3/4 BALSA BLOCK DORSAL1/2 BALSA RUDDER SPAR FILLER BLOCK I 3/32 BALSA RIBS V2 SOFT BALSA BASE ACRYLIC SHEET 1G CArJOPY7iiiPJ TFORMED OR 1/2 BALSA SHEET ELEViIORS IA6 PLYWXJD OF LONGERONS PLYW0D DECK3/32 BALSA I/8SQ STRIPS FORMERS BEVELED BALSA F 6 TO F K -I 1/16 SHEET BALSA OVER FOCM 95/16 MED5/16SQSPRUCE SPAR5/8 BALSAT1P 1/4 3JFT BALSA BOTTOM1/4 SQ BALSA LONGERONS AND CROSS BRACES / I.1/8 MED BALSA SIDE PLANKING I/16PLvVKDD INSIDE DOUBLER TO FIREWALL I/8PLWCCO RUDDER BAR ON 1/4 PLYWCD BRACKET 3/850 MAPLE LG BEAMS WITH T-NUTS BASSvOJD WING MOUNT BLOCK AND NYLON SCREW 2 3/32 r&JSIC WIRE THRU BRASS TUBE TO AILERONS GLASS CLOTH OVER MID SECTION ONLY 5/16 X 1/2 HARDWCOD SPAR K HARD BALSA AILERONS p 1 1/16 WIRE L G RETRACT LINKAGE 4-40 SCREWS RENE RETRACT COVER ERG RETRT NISM MAINS 1/2 X TAPERED LEADING EDGE 3/32 SHEET PLANK TOP AND BOTTOMFOAM CORE 1/4 BALSA HOLLOWED FOR WING TIPS August 1979 15 Offset muffler adapter trick lower engine below top line cowl Note aluminum engine mount has trimmed fit shape cowl bulkhead below made conventional plaster mold cause its shape would have locked mold carved scrap block balsa made 1/16 inch undersize dimensions covered several layers fiberglass cloth epoxy polyester resin balsa hollowed out completely leaving fiberglass shell used small sanding drum electric drill quickly grind away balsa An alternate method carve sand shape foam plastic such remnants wing foam covered fiberglass epoxy polyester foam dissolved solvent lacquer thinner dope thinner methyl ethyl ketone leaving shell wood bulkhead epoxy glued rear cowl add stiffness serve mount drawing shows home-made en gine mount muffler adapter adapter cut angle permits mounting engine 15 degrees above horizontal straight adapter found mufflers would require angle increased about 30 degrees engine cylinder projects greater distance above cowl top reason angled adapter drawing engine mount bulkhead shows both 15- 30-degree hole loca Continued Goldberg retract mechanism foam wing hardwood rails Styrene plastic gear cover removed above Note hardwood tapped dowels epoxied wing cover hold-downs Close attention such extra refinements contributes feeling scale enhanced acrobatic ship 16 Model Aviation Fuel tank easily accessible cover removed Tank packed foam plastic forvibration insulation Small balsa ledges glued cover opening leveling cover Right Notched support aileron servo permits access mounting screws 180-degree retract servo Note disc output retract servo insure positive locking mechanism Arm-type out-put will flex break Doing things right avoids annoying troubles ThicK ruuoer nas plywooa norns ana sTranded steel wires controlneat light installa tion Elevator horn exposed convenient adjustment could hidden inside fuselage Dual elevator horns recommend split flip pers large orfast aircraftto avoid uneven responses introduce rolling moment KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals 10- 6 9- 7 Nashville Slow Rat 8- 8 Gillopt 8 8 Regular 8- 7 Regular 7 6 7 55 $650 $650 $500 $475 $475 $375 Graphite $500 - 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 TEAM RACE PROPS DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP lw/out counter balence Fiber $400 Graphite $500 DIESEL HEADS fit 15 engines $18 ORDER DlRECT 72 hour shipping cashiers checks money orders 10-day person al checks Money promptly refunded prop stock KELLY PRODUCTS INC P0 Box 38 Western Springs IL 60558 104 Model Aviation vide small portions time day presently 128 pages magazine staff consists five full-time nearly others AMA HQ also help outto equal almost 214 full-timers Schroder eve can finance prolect must cost ex cess $200000 nine months unfulfilled subscriptions Fact Income avail able unfilled subscriptions 1975 advertising etc amounted $204424 costs including printing salaries rent telephone etc came $201394for sur plus profit just over $3000 Schroder agic basis [$200000] figure costs fixed publisher am well aware what will chart An 80-page book 40000 circulation will cost mini mum $17000 printed will require $1500 worth typesetting $3500 2nd class postagefulfillment subscription costs include preparation cheshire strips $1000 editorial content fees $2500 Fact MA cir culation 40000 1975 closer 50000 Schroder way off cases actual averages print ing $11062 typesetting $1014 postage $1113 labels $445 editorial fees $3684 could person field years actually using same printer MA far off Amazing Schroder He [the AMA Executive Direc tor] says can print cheaper used conservative figures estimate Fact AMA Executive Direc tors cost figures based MA pub lishers gathering cost information coincided actual results Consider Walts motive 1975 professed m interests AMAto save extinction lack growth unaffordable magazine costs recom mendation kill magazine Consider Walt published readers letter early 1979 considering compensat ing income factors suggested wrongly MA used general AMA dues money magazine should killed newsletter substituted Walt published letter suppos edly right AMA members know didnt deliver promise print other AMAs side story lat est message its apparent still wants MA killedbut new reasoning faulty old Ariel Sport/Wischer continued page 16 tions aluminum engine mounts Other holes will affected fuel line muffler pressure line throttle pushrod Since fuselage bulk heads needed before fuselage construc tion can begin hole locations must decided upon Laminate fuselage sides 1/16 ply wood a using contact adhesive right side has cut-out muffler space Add -square balsa bracing fuselage rear preference sequence steps construction begins 1/16 plywood fuselage top adding i beveled balsa strips bulkheads F5 FlO followed prepared fuselage sides Add F2 F4 lower balsa nose blocks nose formers F 15 thru F24 including cover frame Follow tail post -sq cross bracing fuselage bottom top formers F6 thru F 14 -square cement strips -square former brace Make heavy paper templates plywood deck nose section assure good fit plywood soaked water its outer surface make pliable can easily formed around formers fastened place white glue Have plentiful supply heavy number 62 64 rubber bands hand applying pressure glue sets perfect joint necessity can easily leveled later Epoxolite care must exercised certain ply firm contact formers plywood covering process much easier appears description ease maintenance prefer make fu& tank nose-gear retract mechanism accessible removable covers bit forethought has already paid dividends cleaning adjustment Goldberg retract mechanism has quite free maintenance problems once ad justed according instructions es pecially locking down avoid gear collapsing landing Having broken sev eral servo output arms have switched discs would recommend some means adjusting pushrod length bend wire length brass tube soldered over break wire canopy shown fabricated 1/32 acrylic sheet Plexiglas stretch formed after heating kitchen oven 2500 F balsa form leftover previous plane windshield portion drape formed oven over aluminum sheet bent desired shape 15-in-long canopy lighter material approximately equal size available Sig Tail surfaces Stabilizer foam core cut templates hot-wire technique foam halves epoxy glued center covered 1/16 sheet balsa piece tip tip continuous sheet cover provides stronger center Leading trailing edges added sanded airfoil section shape Vertical fin built up ribs covered 1/16 sheet balsa rudder has open rib construction requiring silk plas tic film cover reduce weight weight saving tail rudder operated means steel control-line cable full-size planes could changed pushrod option builder Elevator controlled l pushrod brought out nylon elevator horn through fuselage side improved appearance horn could have metal brazed music wire elevator joiner center done clevis hole horn should 1 inch joiner wire Finishing Being old school RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1 /83/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE -$1000 PER SPOOL PPD IN US ADDITIONAL SPOOLS $950 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1400 PER HANK PPD IN US ADDITIONAL HANKS $1350 SOLE US DISTRIBUTOR AND WORLD WIDE SALES FAIModl Supply P0 Box 9778 Phoenix Arizona 85068 aircraft finishing continue use silk dope because like toughness strength resistance dents scratches ever structure does need added strength plastic film covering could used equal success make no effort obtain super finish complete struc ture given three heavy brushed coats clear dope minimum thinner added Silk applied wet over balsa surfaces plywood silk given five six brushed coats clear dope followed two coats very thin dope talcum powder mixture filler mixture contains too little thinner filler becomes difficult sand too much talc used finish will reticulate crack will also difficult sand because loads sand paper Using number 150 grade open-coat aluminum oxide paper talc will removed sanding leaving pores silk filled silk grain will plainly visible Two coats clear will seal talc prevent its bleeding through final color coats clear coats can either brushed sprayed Color coats follow use spray light finish Color used hide surface blemishes should non existent after talc sanding Since color adds weight keep color coats light density Plywood surfaces fiber glass cowl need minimum preparation Flying Check correct center gravity plane needed no addition weight its first flight also needed no trim change Retracting landing gear will have greater effect expected because large wheels contribute drag plane doesnt really need retracts could easily converted rigid gear substituting hardwood mounts wings stand ard tricycle nose gear Takeoff landing real pleasure nose gear length shown touch up elevator takeoff speed lifts nose gracefully tendency jump off As plane approaches ground landing up elevator fed gradually holding nose up touch-down rear wheels first no tendency wing tip drop during type landing used scale-like performance reduce speed minimum impact Control surface travel side cen ter follows elevator 11/16 aileron 3/16 rudder 1W low travel elevator aileron contributing fac tors smooth handling enjoy Ariel Sport Elevator needs travel sufficient amount lower tail takeoff landing aileron travel indicated plane will axial roll less two seconds wide rudder travel used execution stall turns Spins snap-roll maneuvers positive both entry recovery Inverted flight requires bit down elevator held really enjoy flying plane think will too RC Technique/Myers continued page 23 receiver Ordinarily servo hooked up active system doing nothing will draw between 5 15 ma will jump up something like 250 ma move stick transmitter servo able move freely servo trying work against hinges have accidently epoxied together current will go higher usually some between 400 500 ma servo needs cleaning will draw current usual doing nothing Thats because dirty servos usually jitter shiver about transmitter Most trans mitters use some kind special charging plug thats hard find expensive Therefore easiest thing cut wires charger clip meter before thing about approach unsatisfactory have re connect cut ends restore normal operation Since probably wont measuring transmitter charging current very often because wont tell much just solder cut ends together again cover piece tape will take time measure charging currents system new write measured values owners manual will some value checking time time current will drop below normal values August 1979 105 Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage Et handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 W WI MODEL ACCESSORIES FINE QUALITY ENGINE KITS & CYLINDERS MACHINE GUN KITS LS TS INGS SEND SOt FOR COMPLETE CATALOG DEPr MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA S 92069 [F Cuts Coverite gj4& Monokote better T other lade Lasts much CURVED MIC PROTECTSMCOVER &TABLETOPLETS YOU 8LAOE CARRY TRIMIT IN YOUR POCKET cells start drying out sign old age same reduction occurs have dirty connections fractured wires charg ing ioop other hand current will increase bit event have short-circuited cell somewhere pack Transmitters frequently operate long periods two shorted cells because resulting voltage loss doesnt reduce signal output critical level dont measure charging current about notice transmitter has charged frequently personal opinion charger should have reliable ammeter reason dont have cost cheap meters cost real money Since us have charger best alternative buy VOM make up handful adapters like described Thats month Keep letters coming George Myers 70 Froehlich Farm Rd Hicks yule NY 11801 ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new Pclass model designed ce mind has potential win toughest COnl-p-eIitrO-tr THE POTENT30 Deluse kit features include Rolled balsa tusela e wing mount dt Completed prop nose plu9 tail plug & rudder Precut wing ribsapar notches job rated balsa strips Highest quality tissue lubed contest rubber Detailed instructions flying tips help yoa wiel CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE N08 SACTO CALIF 95821 RC Soaring/Pruss Continued page 25 types thermal fliers well should noted wing root faced plywood another plywood rib three inches outboard provide support 5mm ID tubing accommodates main support wire three-function gliderrudder elevator moveable wingsnot ailerons moveable wings idea nothing new Bob Boucher ASW couple years back same function did others tried sake doing Some systems straight-forward others looked like innards slot machine French bird simple like things appear simple theyre result refinements Such case Axel Jean Claude Bosquet current French aerobatic champion refined design what see result four years development fuselage although aesthetically sleek appearance has flat sides parallel 1 Fiberglass fin Ipart fuselage 2 1/16 Plywood Stiffen fin expoxy 3 1/16VVireepoxy 4 1/l6VVireepoxv wire makes contact fin 5 1/16 Plywood drill out 3&4 6 Balsa rudder place 3 Ii II ii 4 1 0 5 B flatness ends trailing edge wing meets flatness allows mechanics kept simple airfoil design changed fuselage wing fillet giving away However having fillet fuselage tends weak wing trailing juncture Bosquet cleverly reinforced fuselage point epoxying plywood ring fuselage might seem like simple solution treating vulnerable spot Ive seen some filletless home designs werent beefed up area wing tip used first point touch-down trailing edge knifed fuselage leaving field repair made heart models wing moving ability lies specially molded bell cranks Bosquet developed Again simpleafter see themthey mount fuselage pivot common wire diameter Drive pins stick out fuselage slip wings just about two-thirds back leading edge wings held close fuselage onto wires rubber bands attached screw-in hooks wing roots rubber bands stretch behind main support rod point wing pivot thereby restricting wing movement provide wing fuselage clearance main support tube extends beyond fuselage sides 1/32 inch ends fuselage wing tubes provide al frictionless pivot point Slick As thermal competition fliers real ize reducing drag means time air know real hat sucker thermal will get ten-minute maxes manhole covers its dead air sleekness can mean seconds minutes sleekness means no ugly protuberances wide gaps can cause turbulence Sloppy fits around canopy fuselages can cost time Wide gaps just plain gaps around fuselage wing joints can induce drag point its worse doubling cross-section fuselage point dirtiest areas aerodynamically speaking sailplanes tail area its flying 106 Model Aviation
Edition: Model Aviation - 1979/08
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 104, 105, 106
NO OCR TEXT NO OCR TEXT Top Scale-like engine cowl large canopy greater average fuselage depth pro vide approach realism Left Rudder bar right pic short pushrod servo cables rudder Above right Goldberg re tract nose gear installation rear firewall Retract 180-degree servo rear first bulk headdirect connecting rod betweensteering pushrod alongside Right Compare view tail surface actuation black white pic bottom view thick rudder wide fiberglass cloth bandage wrapped cemented around wing center sec tion using either polyester resin epoxy keeping mind resin erodes foam fiberglass will require some sanding blending filler its edges installation Goldberg retracts demands close attention instruction sheet music wire gear legs given set rearward direction assure wheels will fit wells after few hard landings instruction sheet specifies small hole operating 1 2 Model Aviation FULL SIZE PLANS AVAILABLE . SEE PAGE 128 pushrod drawing calls full tapering solution depth slot needed assembly Ailerons uniform thickness throughout length tapered narrow toward wing tip because possibility flutter high speeds springy constant chord type used should hard material Extreme flutter can hazardous ailerons soft enough twist Fuselage Some building practices fuselage may seem unorthodox Onesixteenth plywood used sides top rear bulkhead some formers much stronger a weighs about same Wherever thicker plywood speci fied itwas laminated layers 1/16 produce material greater strength standard 5-ply Decks nose section covered 1/32 plywood stronger balsa planking requires sealer color coats fine finish Block balsa used compound curves bottom nose section fiberglass nose cowl could August 1979 13 ____---.- WTh 6 ---------.ASEL SPORT 1- -________ 1 1 ARIEL SPORT .. F20 F22 F 17 F3 I/B PLYMXD COWL BACK F16 FORMED OVER BALSA OR FOAM CORE- REMED 3/32 PLYWO COWL cOVERING l/3 PLYWCOD HATCH TOP F5 KRAFT I2OZ TANK FIBERGLASS COWLING F4 l/4PLYWcOD FIREWALL 23/4 DA SPINNER SHORTENED SIG ALUMINUM ENGINE MOUNT 3A6 PLYWOOD BULKHEAD F 3 1/8 PLYWOOD COWL MOUNP CARL GOLDBERG TRI GEAR RETRACT MECHANISM W5 WING FILLET 1/16 PLYWOOD OVER 3/32BALSA LINER AROUND WHEEL WELL K SERO ON F 5 CONTROLS NOSE GEAR RETRACT I/I6X FORM BLOCKS 2 2 3/4 DIA MAIN WHEELS 2 2 1/2 DIA NOSE WHEEL 14 Modei Aviation I/I F19 F23 F15 3/8 BASS SERVO TRAY SUPPOR1 I/4PLYVOD CANC SUPPORT F8 3/16X I/2HATCH RAILS WEBRA 60 BLACK HEAD 2i 1 F1\ WING LE DOWEL 2 NOSE GEAR cOVER HATCH AND FRONT ANCHOR SCR/S 1/32 PLYWOOD COVER 4BALSA FIN LE/2 BALSA TIPS/8 X /4 RUDDER E 3/32BALSA FIN IBS1/4 HARD BALSA FIN SR 3/4 BALSA BLOCK DORSAL1/2 BALSA RUDDER SPAR FILLER BLOCK I 3/32 BALSA RIBS V2 SOFT BALSA BASE ACRYLIC SHEET 1G CArJOPY7iiiPJ TFORMED OR 1/2 BALSA SHEET ELEViIORS IA6 PLYWXJD OF LONGERONS PLYW0D DECK3/32 BALSA I/8SQ STRIPS FORMERS BEVELED BALSA F 6 TO F K -I 1/16 SHEET BALSA OVER FOCM 95/16 MED5/16SQSPRUCE SPAR5/8 BALSAT1P 1/4 3JFT BALSA BOTTOM1/4 SQ BALSA LONGERONS AND CROSS BRACES / I.1/8 MED BALSA SIDE PLANKING I/16PLvVKDD INSIDE DOUBLER TO FIREWALL I/8PLWCCO RUDDER BAR ON 1/4 PLYWCD BRACKET 3/850 MAPLE LG BEAMS WITH T-NUTS BASSvOJD WING MOUNT BLOCK AND NYLON SCREW 2 3/32 r&JSIC WIRE THRU BRASS TUBE TO AILERONS GLASS CLOTH OVER MID SECTION ONLY 5/16 X 1/2 HARDWCOD SPAR K HARD BALSA AILERONS p 1 1/16 WIRE L G RETRACT LINKAGE 4-40 SCREWS RENE RETRACT COVER ERG RETRT NISM MAINS 1/2 X TAPERED LEADING EDGE 3/32 SHEET PLANK TOP AND BOTTOMFOAM CORE 1/4 BALSA HOLLOWED FOR WING TIPS August 1979 15 Offset muffler adapter trick lower engine below top line cowl Note aluminum engine mount has trimmed fit shape cowl bulkhead below made conventional plaster mold cause its shape would have locked mold carved scrap block balsa made 1/16 inch undersize dimensions covered several layers fiberglass cloth epoxy polyester resin balsa hollowed out completely leaving fiberglass shell used small sanding drum electric drill quickly grind away balsa An alternate method carve sand shape foam plastic such remnants wing foam covered fiberglass epoxy polyester foam dissolved solvent lacquer thinner dope thinner methyl ethyl ketone leaving shell wood bulkhead epoxy glued rear cowl add stiffness serve mount drawing shows home-made en gine mount muffler adapter adapter cut angle permits mounting engine 15 degrees above horizontal straight adapter found mufflers would require angle increased about 30 degrees engine cylinder projects greater distance above cowl top reason angled adapter drawing engine mount bulkhead shows both 15- 30-degree hole loca Continued Goldberg retract mechanism foam wing hardwood rails Styrene plastic gear cover removed above Note hardwood tapped dowels epoxied wing cover hold-downs Close attention such extra refinements contributes feeling scale enhanced acrobatic ship 16 Model Aviation Fuel tank easily accessible cover removed Tank packed foam plastic forvibration insulation Small balsa ledges glued cover opening leveling cover Right Notched support aileron servo permits access mounting screws 180-degree retract servo Note disc output retract servo insure positive locking mechanism Arm-type out-put will flex break Doing things right avoids annoying troubles ThicK ruuoer nas plywooa norns ana sTranded steel wires controlneat light installa tion Elevator horn exposed convenient adjustment could hidden inside fuselage Dual elevator horns recommend split flip pers large orfast aircraftto avoid uneven responses introduce rolling moment KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals 10- 6 9- 7 Nashville Slow Rat 8- 8 Gillopt 8 8 Regular 8- 7 Regular 7 6 7 55 $650 $650 $500 $475 $475 $375 Graphite $500 - 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 TEAM RACE PROPS DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP lw/out counter balence Fiber $400 Graphite $500 DIESEL HEADS fit 15 engines $18 ORDER DlRECT 72 hour shipping cashiers checks money orders 10-day person al checks Money promptly refunded prop stock KELLY PRODUCTS INC P0 Box 38 Western Springs IL 60558 104 Model Aviation vide small portions time day presently 128 pages magazine staff consists five full-time nearly others AMA HQ also help outto equal almost 214 full-timers Schroder eve can finance prolect must cost ex cess $200000 nine months unfulfilled subscriptions Fact Income avail able unfilled subscriptions 1975 advertising etc amounted $204424 costs including printing salaries rent telephone etc came $201394for sur plus profit just over $3000 Schroder agic basis [$200000] figure costs fixed publisher am well aware what will chart An 80-page book 40000 circulation will cost mini mum $17000 printed will require $1500 worth typesetting $3500 2nd class postagefulfillment subscription costs include preparation cheshire strips $1000 editorial content fees $2500 Fact MA cir culation 40000 1975 closer 50000 Schroder way off cases actual averages print ing $11062 typesetting $1014 postage $1113 labels $445 editorial fees $3684 could person field years actually using same printer MA far off Amazing Schroder He [the AMA Executive Direc tor] says can print cheaper used conservative figures estimate Fact AMA Executive Direc tors cost figures based MA pub lishers gathering cost information coincided actual results Consider Walts motive 1975 professed m interests AMAto save extinction lack growth unaffordable magazine costs recom mendation kill magazine Consider Walt published readers letter early 1979 considering compensat ing income factors suggested wrongly MA used general AMA dues money magazine should killed newsletter substituted Walt published letter suppos edly right AMA members know didnt deliver promise print other AMAs side story lat est message its apparent still wants MA killedbut new reasoning faulty old Ariel Sport/Wischer continued page 16 tions aluminum engine mounts Other holes will affected fuel line muffler pressure line throttle pushrod Since fuselage bulk heads needed before fuselage construc tion can begin hole locations must decided upon Laminate fuselage sides 1/16 ply wood a using contact adhesive right side has cut-out muffler space Add -square balsa bracing fuselage rear preference sequence steps construction begins 1/16 plywood fuselage top adding i beveled balsa strips bulkheads F5 FlO followed prepared fuselage sides Add F2 F4 lower balsa nose blocks nose formers F 15 thru F24 including cover frame Follow tail post -sq cross bracing fuselage bottom top formers F6 thru F 14 -square cement strips -square former brace Make heavy paper templates plywood deck nose section assure good fit plywood soaked water its outer surface make pliable can easily formed around formers fastened place white glue Have plentiful supply heavy number 62 64 rubber bands hand applying pressure glue sets perfect joint necessity can easily leveled later Epoxolite care must exercised certain ply firm contact formers plywood covering process much easier appears description ease maintenance prefer make fu& tank nose-gear retract mechanism accessible removable covers bit forethought has already paid dividends cleaning adjustment Goldberg retract mechanism has quite free maintenance problems once ad justed according instructions es pecially locking down avoid gear collapsing landing Having broken sev eral servo output arms have switched discs would recommend some means adjusting pushrod length bend wire length brass tube soldered over break wire canopy shown fabricated 1/32 acrylic sheet Plexiglas stretch formed after heating kitchen oven 2500 F balsa form leftover previous plane windshield portion drape formed oven over aluminum sheet bent desired shape 15-in-long canopy lighter material approximately equal size available Sig Tail surfaces Stabilizer foam core cut templates hot-wire technique foam halves epoxy glued center covered 1/16 sheet balsa piece tip tip continuous sheet cover provides stronger center Leading trailing edges added sanded airfoil section shape Vertical fin built up ribs covered 1/16 sheet balsa rudder has open rib construction requiring silk plas tic film cover reduce weight weight saving tail rudder operated means steel control-line cable full-size planes could changed pushrod option builder Elevator controlled l pushrod brought out nylon elevator horn through fuselage side improved appearance horn could have metal brazed music wire elevator joiner center done clevis hole horn should 1 inch joiner wire Finishing Being old school RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1 /83/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE -$1000 PER SPOOL PPD IN US ADDITIONAL SPOOLS $950 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1400 PER HANK PPD IN US ADDITIONAL HANKS $1350 SOLE US DISTRIBUTOR AND WORLD WIDE SALES FAIModl Supply P0 Box 9778 Phoenix Arizona 85068 aircraft finishing continue use silk dope because like toughness strength resistance dents scratches ever structure does need added strength plastic film covering could used equal success make no effort obtain super finish complete struc ture given three heavy brushed coats clear dope minimum thinner added Silk applied wet over balsa surfaces plywood silk given five six brushed coats clear dope followed two coats very thin dope talcum powder mixture filler mixture contains too little thinner filler becomes difficult sand too much talc used finish will reticulate crack will also difficult sand because loads sand paper Using number 150 grade open-coat aluminum oxide paper talc will removed sanding leaving pores silk filled silk grain will plainly visible Two coats clear will seal talc prevent its bleeding through final color coats clear coats can either brushed sprayed Color coats follow use spray light finish Color used hide surface blemishes should non existent after talc sanding Since color adds weight keep color coats light density Plywood surfaces fiber glass cowl need minimum preparation Flying Check correct center gravity plane needed no addition weight its first flight also needed no trim change Retracting landing gear will have greater effect expected because large wheels contribute drag plane doesnt really need retracts could easily converted rigid gear substituting hardwood mounts wings stand ard tricycle nose gear Takeoff landing real pleasure nose gear length shown touch up elevator takeoff speed lifts nose gracefully tendency jump off As plane approaches ground landing up elevator fed gradually holding nose up touch-down rear wheels first no tendency wing tip drop during type landing used scale-like performance reduce speed minimum impact Control surface travel side cen ter follows elevator 11/16 aileron 3/16 rudder 1W low travel elevator aileron contributing fac tors smooth handling enjoy Ariel Sport Elevator needs travel sufficient amount lower tail takeoff landing aileron travel indicated plane will axial roll less two seconds wide rudder travel used execution stall turns Spins snap-roll maneuvers positive both entry recovery Inverted flight requires bit down elevator held really enjoy flying plane think will too RC Technique/Myers continued page 23 receiver Ordinarily servo hooked up active system doing nothing will draw between 5 15 ma will jump up something like 250 ma move stick transmitter servo able move freely servo trying work against hinges have accidently epoxied together current will go higher usually some between 400 500 ma servo needs cleaning will draw current usual doing nothing Thats because dirty servos usually jitter shiver about transmitter Most trans mitters use some kind special charging plug thats hard find expensive Therefore easiest thing cut wires charger clip meter before thing about approach unsatisfactory have re connect cut ends restore normal operation Since probably wont measuring transmitter charging current very often because wont tell much just solder cut ends together again cover piece tape will take time measure charging currents system new write measured values owners manual will some value checking time time current will drop below normal values August 1979 105 Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage Et handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 W WI MODEL ACCESSORIES FINE QUALITY ENGINE KITS & CYLINDERS MACHINE GUN KITS LS TS INGS SEND SOt FOR COMPLETE CATALOG DEPr MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA S 92069 [F Cuts Coverite gj4& Monokote better T other lade Lasts much CURVED MIC PROTECTSMCOVER &TABLETOPLETS YOU 8LAOE CARRY TRIMIT IN YOUR POCKET cells start drying out sign old age same reduction occurs have dirty connections fractured wires charg ing ioop other hand current will increase bit event have short-circuited cell somewhere pack Transmitters frequently operate long periods two shorted cells because resulting voltage loss doesnt reduce signal output critical level dont measure charging current about notice transmitter has charged frequently personal opinion charger should have reliable ammeter reason dont have cost cheap meters cost real money Since us have charger best alternative buy VOM make up handful adapters like described Thats month Keep letters coming George Myers 70 Froehlich Farm Rd Hicks yule NY 11801 ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new Pclass model designed ce mind has potential win toughest COnl-p-eIitrO-tr THE POTENT30 Deluse kit features include Rolled balsa tusela e wing mount dt Completed prop nose plu9 tail plug & rudder Precut wing ribsapar notches job rated balsa strips Highest quality tissue lubed contest rubber Detailed instructions flying tips help yoa wiel CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE N08 SACTO CALIF 95821 RC Soaring/Pruss Continued page 25 types thermal fliers well should noted wing root faced plywood another plywood rib three inches outboard provide support 5mm ID tubing accommodates main support wire three-function gliderrudder elevator moveable wingsnot ailerons moveable wings idea nothing new Bob Boucher ASW couple years back same function did others tried sake doing Some systems straight-forward others looked like innards slot machine French bird simple like things appear simple theyre result refinements Such case Axel Jean Claude Bosquet current French aerobatic champion refined design what see result four years development fuselage although aesthetically sleek appearance has flat sides parallel 1 Fiberglass fin Ipart fuselage 2 1/16 Plywood Stiffen fin expoxy 3 1/16VVireepoxy 4 1/l6VVireepoxv wire makes contact fin 5 1/16 Plywood drill out 3&4 6 Balsa rudder place 3 Ii II ii 4 1 0 5 B flatness ends trailing edge wing meets flatness allows mechanics kept simple airfoil design changed fuselage wing fillet giving away However having fillet fuselage tends weak wing trailing juncture Bosquet cleverly reinforced fuselage point epoxying plywood ring fuselage might seem like simple solution treating vulnerable spot Ive seen some filletless home designs werent beefed up area wing tip used first point touch-down trailing edge knifed fuselage leaving field repair made heart models wing moving ability lies specially molded bell cranks Bosquet developed Again simpleafter see themthey mount fuselage pivot common wire diameter Drive pins stick out fuselage slip wings just about two-thirds back leading edge wings held close fuselage onto wires rubber bands attached screw-in hooks wing roots rubber bands stretch behind main support rod point wing pivot thereby restricting wing movement provide wing fuselage clearance main support tube extends beyond fuselage sides 1/32 inch ends fuselage wing tubes provide al frictionless pivot point Slick As thermal competition fliers real ize reducing drag means time air know real hat sucker thermal will get ten-minute maxes manhole covers its dead air sleekness can mean seconds minutes sleekness means no ugly protuberances wide gaps can cause turbulence Sloppy fits around canopy fuselages can cost time Wide gaps just plain gaps around fuselage wing joints can induce drag point its worse doubling cross-section fuselage point dirtiest areas aerodynamically speaking sailplanes tail area its flying 106 Model Aviation
Edition: Model Aviation - 1979/08
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 104, 105, 106
NO OCR TEXT NO OCR TEXT Top Scale-like engine cowl large canopy greater average fuselage depth pro vide approach realism Left Rudder bar right pic short pushrod servo cables rudder Above right Goldberg re tract nose gear installation rear firewall Retract 180-degree servo rear first bulk headdirect connecting rod betweensteering pushrod alongside Right Compare view tail surface actuation black white pic bottom view thick rudder wide fiberglass cloth bandage wrapped cemented around wing center sec tion using either polyester resin epoxy keeping mind resin erodes foam fiberglass will require some sanding blending filler its edges installation Goldberg retracts demands close attention instruction sheet music wire gear legs given set rearward direction assure wheels will fit wells after few hard landings instruction sheet specifies small hole operating 1 2 Model Aviation FULL SIZE PLANS AVAILABLE . SEE PAGE 128 pushrod drawing calls full tapering solution depth slot needed assembly Ailerons uniform thickness throughout length tapered narrow toward wing tip because possibility flutter high speeds springy constant chord type used should hard material Extreme flutter can hazardous ailerons soft enough twist Fuselage Some building practices fuselage may seem unorthodox Onesixteenth plywood used sides top rear bulkhead some formers much stronger a weighs about same Wherever thicker plywood speci fied itwas laminated layers 1/16 produce material greater strength standard 5-ply Decks nose section covered 1/32 plywood stronger balsa planking requires sealer color coats fine finish Block balsa used compound curves bottom nose section fiberglass nose cowl could August 1979 13 ____---.- WTh 6 ---------.ASEL SPORT 1- -________ 1 1 ARIEL SPORT .. F20 F22 F 17 F3 I/B PLYMXD COWL BACK F16 FORMED OVER BALSA OR FOAM CORE- REMED 3/32 PLYWO COWL cOVERING l/3 PLYWCOD HATCH TOP F5 KRAFT I2OZ TANK FIBERGLASS COWLING F4 l/4PLYWcOD FIREWALL 23/4 DA SPINNER SHORTENED SIG ALUMINUM ENGINE MOUNT 3A6 PLYWOOD BULKHEAD F 3 1/8 PLYWOOD COWL MOUNP CARL GOLDBERG TRI GEAR RETRACT MECHANISM W5 WING FILLET 1/16 PLYWOOD OVER 3/32BALSA LINER AROUND WHEEL WELL K SERO ON F 5 CONTROLS NOSE GEAR RETRACT I/I6X FORM BLOCKS 2 2 3/4 DIA MAIN WHEELS 2 2 1/2 DIA NOSE WHEEL 14 Modei Aviation I/I F19 F23 F15 3/8 BASS SERVO TRAY SUPPOR1 I/4PLYVOD CANC SUPPORT F8 3/16X I/2HATCH RAILS WEBRA 60 BLACK HEAD 2i 1 F1\ WING LE DOWEL 2 NOSE GEAR cOVER HATCH AND FRONT ANCHOR SCR/S 1/32 PLYWOOD COVER 4BALSA FIN LE/2 BALSA TIPS/8 X /4 RUDDER E 3/32BALSA FIN IBS1/4 HARD BALSA FIN SR 3/4 BALSA BLOCK DORSAL1/2 BALSA RUDDER SPAR FILLER BLOCK I 3/32 BALSA RIBS V2 SOFT BALSA BASE ACRYLIC SHEET 1G CArJOPY7iiiPJ TFORMED OR 1/2 BALSA SHEET ELEViIORS IA6 PLYWXJD OF LONGERONS PLYW0D DECK3/32 BALSA I/8SQ STRIPS FORMERS BEVELED BALSA F 6 TO F K -I 1/16 SHEET BALSA OVER FOCM 95/16 MED5/16SQSPRUCE SPAR5/8 BALSAT1P 1/4 3JFT BALSA BOTTOM1/4 SQ BALSA LONGERONS AND CROSS BRACES / I.1/8 MED BALSA SIDE PLANKING I/16PLvVKDD INSIDE DOUBLER TO FIREWALL I/8PLWCCO RUDDER BAR ON 1/4 PLYWCD BRACKET 3/850 MAPLE LG BEAMS WITH T-NUTS BASSvOJD WING MOUNT BLOCK AND NYLON SCREW 2 3/32 r&JSIC WIRE THRU BRASS TUBE TO AILERONS GLASS CLOTH OVER MID SECTION ONLY 5/16 X 1/2 HARDWCOD SPAR K HARD BALSA AILERONS p 1 1/16 WIRE L G RETRACT LINKAGE 4-40 SCREWS RENE RETRACT COVER ERG RETRT NISM MAINS 1/2 X TAPERED LEADING EDGE 3/32 SHEET PLANK TOP AND BOTTOMFOAM CORE 1/4 BALSA HOLLOWED FOR WING TIPS August 1979 15 Offset muffler adapter trick lower engine below top line cowl Note aluminum engine mount has trimmed fit shape cowl bulkhead below made conventional plaster mold cause its shape would have locked mold carved scrap block balsa made 1/16 inch undersize dimensions covered several layers fiberglass cloth epoxy polyester resin balsa hollowed out completely leaving fiberglass shell used small sanding drum electric drill quickly grind away balsa An alternate method carve sand shape foam plastic such remnants wing foam covered fiberglass epoxy polyester foam dissolved solvent lacquer thinner dope thinner methyl ethyl ketone leaving shell wood bulkhead epoxy glued rear cowl add stiffness serve mount drawing shows home-made en gine mount muffler adapter adapter cut angle permits mounting engine 15 degrees above horizontal straight adapter found mufflers would require angle increased about 30 degrees engine cylinder projects greater distance above cowl top reason angled adapter drawing engine mount bulkhead shows both 15- 30-degree hole loca Continued Goldberg retract mechanism foam wing hardwood rails Styrene plastic gear cover removed above Note hardwood tapped dowels epoxied wing cover hold-downs Close attention such extra refinements contributes feeling scale enhanced acrobatic ship 16 Model Aviation Fuel tank easily accessible cover removed Tank packed foam plastic forvibration insulation Small balsa ledges glued cover opening leveling cover Right Notched support aileron servo permits access mounting screws 180-degree retract servo Note disc output retract servo insure positive locking mechanism Arm-type out-put will flex break Doing things right avoids annoying troubles ThicK ruuoer nas plywooa norns ana sTranded steel wires controlneat light installa tion Elevator horn exposed convenient adjustment could hidden inside fuselage Dual elevator horns recommend split flip pers large orfast aircraftto avoid uneven responses introduce rolling moment KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals 10- 6 9- 7 Nashville Slow Rat 8- 8 Gillopt 8 8 Regular 8- 7 Regular 7 6 7 55 $650 $650 $500 $475 $475 $375 Graphite $500 - 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 TEAM RACE PROPS DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP lw/out counter balence Fiber $400 Graphite $500 DIESEL HEADS fit 15 engines $18 ORDER DlRECT 72 hour shipping cashiers checks money orders 10-day person al checks Money promptly refunded prop stock KELLY PRODUCTS INC P0 Box 38 Western Springs IL 60558 104 Model Aviation vide small portions time day presently 128 pages magazine staff consists five full-time nearly others AMA HQ also help outto equal almost 214 full-timers Schroder eve can finance prolect must cost ex cess $200000 nine months unfulfilled subscriptions Fact Income avail able unfilled subscriptions 1975 advertising etc amounted $204424 costs including printing salaries rent telephone etc came $201394for sur plus profit just over $3000 Schroder agic basis [$200000] figure costs fixed publisher am well aware what will chart An 80-page book 40000 circulation will cost mini mum $17000 printed will require $1500 worth typesetting $3500 2nd class postagefulfillment subscription costs include preparation cheshire strips $1000 editorial content fees $2500 Fact MA cir culation 40000 1975 closer 50000 Schroder way off cases actual averages print ing $11062 typesetting $1014 postage $1113 labels $445 editorial fees $3684 could person field years actually using same printer MA far off Amazing Schroder He [the AMA Executive Direc tor] says can print cheaper used conservative figures estimate Fact AMA Executive Direc tors cost figures based MA pub lishers gathering cost information coincided actual results Consider Walts motive 1975 professed m interests AMAto save extinction lack growth unaffordable magazine costs recom mendation kill magazine Consider Walt published readers letter early 1979 considering compensat ing income factors suggested wrongly MA used general AMA dues money magazine should killed newsletter substituted Walt published letter suppos edly right AMA members know didnt deliver promise print other AMAs side story lat est message its apparent still wants MA killedbut new reasoning faulty old Ariel Sport/Wischer continued page 16 tions aluminum engine mounts Other holes will affected fuel line muffler pressure line throttle pushrod Since fuselage bulk heads needed before fuselage construc tion can begin hole locations must decided upon Laminate fuselage sides 1/16 ply wood a using contact adhesive right side has cut-out muffler space Add -square balsa bracing fuselage rear preference sequence steps construction begins 1/16 plywood fuselage top adding i beveled balsa strips bulkheads F5 FlO followed prepared fuselage sides Add F2 F4 lower balsa nose blocks nose formers F 15 thru F24 including cover frame Follow tail post -sq cross bracing fuselage bottom top formers F6 thru F 14 -square cement strips -square former brace Make heavy paper templates plywood deck nose section assure good fit plywood soaked water its outer surface make pliable can easily formed around formers fastened place white glue Have plentiful supply heavy number 62 64 rubber bands hand applying pressure glue sets perfect joint necessity can easily leveled later Epoxolite care must exercised certain ply firm contact formers plywood covering process much easier appears description ease maintenance prefer make fu& tank nose-gear retract mechanism accessible removable covers bit forethought has already paid dividends cleaning adjustment Goldberg retract mechanism has quite free maintenance problems once ad justed according instructions es pecially locking down avoid gear collapsing landing Having broken sev eral servo output arms have switched discs would recommend some means adjusting pushrod length bend wire length brass tube soldered over break wire canopy shown fabricated 1/32 acrylic sheet Plexiglas stretch formed after heating kitchen oven 2500 F balsa form leftover previous plane windshield portion drape formed oven over aluminum sheet bent desired shape 15-in-long canopy lighter material approximately equal size available Sig Tail surfaces Stabilizer foam core cut templates hot-wire technique foam halves epoxy glued center covered 1/16 sheet balsa piece tip tip continuous sheet cover provides stronger center Leading trailing edges added sanded airfoil section shape Vertical fin built up ribs covered 1/16 sheet balsa rudder has open rib construction requiring silk plas tic film cover reduce weight weight saving tail rudder operated means steel control-line cable full-size planes could changed pushrod option builder Elevator controlled l pushrod brought out nylon elevator horn through fuselage side improved appearance horn could have metal brazed music wire elevator joiner center done clevis hole horn should 1 inch joiner wire Finishing Being old school RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1 /83/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE -$1000 PER SPOOL PPD IN US ADDITIONAL SPOOLS $950 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1400 PER HANK PPD IN US ADDITIONAL HANKS $1350 SOLE US DISTRIBUTOR AND WORLD WIDE SALES FAIModl Supply P0 Box 9778 Phoenix Arizona 85068 aircraft finishing continue use silk dope because like toughness strength resistance dents scratches ever structure does need added strength plastic film covering could used equal success make no effort obtain super finish complete struc ture given three heavy brushed coats clear dope minimum thinner added Silk applied wet over balsa surfaces plywood silk given five six brushed coats clear dope followed two coats very thin dope talcum powder mixture filler mixture contains too little thinner filler becomes difficult sand too much talc used finish will reticulate crack will also difficult sand because loads sand paper Using number 150 grade open-coat aluminum oxide paper talc will removed sanding leaving pores silk filled silk grain will plainly visible Two coats clear will seal talc prevent its bleeding through final color coats clear coats can either brushed sprayed Color coats follow use spray light finish Color used hide surface blemishes should non existent after talc sanding Since color adds weight keep color coats light density Plywood surfaces fiber glass cowl need minimum preparation Flying Check correct center gravity plane needed no addition weight its first flight also needed no trim change Retracting landing gear will have greater effect expected because large wheels contribute drag plane doesnt really need retracts could easily converted rigid gear substituting hardwood mounts wings stand ard tricycle nose gear Takeoff landing real pleasure nose gear length shown touch up elevator takeoff speed lifts nose gracefully tendency jump off As plane approaches ground landing up elevator fed gradually holding nose up touch-down rear wheels first no tendency wing tip drop during type landing used scale-like performance reduce speed minimum impact Control surface travel side cen ter follows elevator 11/16 aileron 3/16 rudder 1W low travel elevator aileron contributing fac tors smooth handling enjoy Ariel Sport Elevator needs travel sufficient amount lower tail takeoff landing aileron travel indicated plane will axial roll less two seconds wide rudder travel used execution stall turns Spins snap-roll maneuvers positive both entry recovery Inverted flight requires bit down elevator held really enjoy flying plane think will too RC Technique/Myers continued page 23 receiver Ordinarily servo hooked up active system doing nothing will draw between 5 15 ma will jump up something like 250 ma move stick transmitter servo able move freely servo trying work against hinges have accidently epoxied together current will go higher usually some between 400 500 ma servo needs cleaning will draw current usual doing nothing Thats because dirty servos usually jitter shiver about transmitter Most trans mitters use some kind special charging plug thats hard find expensive Therefore easiest thing cut wires charger clip meter before thing about approach unsatisfactory have re connect cut ends restore normal operation Since probably wont measuring transmitter charging current very often because wont tell much just solder cut ends together again cover piece tape will take time measure charging currents system new write measured values owners manual will some value checking time time current will drop below normal values August 1979 105 Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage Et handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 W WI MODEL ACCESSORIES FINE QUALITY ENGINE KITS & CYLINDERS MACHINE GUN KITS LS TS INGS SEND SOt FOR COMPLETE CATALOG DEPr MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA S 92069 [F Cuts Coverite gj4& Monokote better T other lade Lasts much CURVED MIC PROTECTSMCOVER &TABLETOPLETS YOU 8LAOE CARRY TRIMIT IN YOUR POCKET cells start drying out sign old age same reduction occurs have dirty connections fractured wires charg ing ioop other hand current will increase bit event have short-circuited cell somewhere pack Transmitters frequently operate long periods two shorted cells because resulting voltage loss doesnt reduce signal output critical level dont measure charging current about notice transmitter has charged frequently personal opinion charger should have reliable ammeter reason dont have cost cheap meters cost real money Since us have charger best alternative buy VOM make up handful adapters like described Thats month Keep letters coming George Myers 70 Froehlich Farm Rd Hicks yule NY 11801 ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new Pclass model designed ce mind has potential win toughest COnl-p-eIitrO-tr THE POTENT30 Deluse kit features include Rolled balsa tusela e wing mount dt Completed prop nose plu9 tail plug & rudder Precut wing ribsapar notches job rated balsa strips Highest quality tissue lubed contest rubber Detailed instructions flying tips help yoa wiel CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE N08 SACTO CALIF 95821 RC Soaring/Pruss Continued page 25 types thermal fliers well should noted wing root faced plywood another plywood rib three inches outboard provide support 5mm ID tubing accommodates main support wire three-function gliderrudder elevator moveable wingsnot ailerons moveable wings idea nothing new Bob Boucher ASW couple years back same function did others tried sake doing Some systems straight-forward others looked like innards slot machine French bird simple like things appear simple theyre result refinements Such case Axel Jean Claude Bosquet current French aerobatic champion refined design what see result four years development fuselage although aesthetically sleek appearance has flat sides parallel 1 Fiberglass fin Ipart fuselage 2 1/16 Plywood Stiffen fin expoxy 3 1/16VVireepoxy 4 1/l6VVireepoxv wire makes contact fin 5 1/16 Plywood drill out 3&4 6 Balsa rudder place 3 Ii II ii 4 1 0 5 B flatness ends trailing edge wing meets flatness allows mechanics kept simple airfoil design changed fuselage wing fillet giving away However having fillet fuselage tends weak wing trailing juncture Bosquet cleverly reinforced fuselage point epoxying plywood ring fuselage might seem like simple solution treating vulnerable spot Ive seen some filletless home designs werent beefed up area wing tip used first point touch-down trailing edge knifed fuselage leaving field repair made heart models wing moving ability lies specially molded bell cranks Bosquet developed Again simpleafter see themthey mount fuselage pivot common wire diameter Drive pins stick out fuselage slip wings just about two-thirds back leading edge wings held close fuselage onto wires rubber bands attached screw-in hooks wing roots rubber bands stretch behind main support rod point wing pivot thereby restricting wing movement provide wing fuselage clearance main support tube extends beyond fuselage sides 1/32 inch ends fuselage wing tubes provide al frictionless pivot point Slick As thermal competition fliers real ize reducing drag means time air know real hat sucker thermal will get ten-minute maxes manhole covers its dead air sleekness can mean seconds minutes sleekness means no ugly protuberances wide gaps can cause turbulence Sloppy fits around canopy fuselages can cost time Wide gaps just plain gaps around fuselage wing joints can induce drag point its worse doubling cross-section fuselage point dirtiest areas aerodynamically speaking sailplanes tail area its flying 106 Model Aviation
Edition: Model Aviation - 1979/08
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 104, 105, 106
NO OCR TEXT NO OCR TEXT Top Scale-like engine cowl large canopy greater average fuselage depth pro vide approach realism Left Rudder bar right pic short pushrod servo cables rudder Above right Goldberg re tract nose gear installation rear firewall Retract 180-degree servo rear first bulk headdirect connecting rod betweensteering pushrod alongside Right Compare view tail surface actuation black white pic bottom view thick rudder wide fiberglass cloth bandage wrapped cemented around wing center sec tion using either polyester resin epoxy keeping mind resin erodes foam fiberglass will require some sanding blending filler its edges installation Goldberg retracts demands close attention instruction sheet music wire gear legs given set rearward direction assure wheels will fit wells after few hard landings instruction sheet specifies small hole operating 1 2 Model Aviation FULL SIZE PLANS AVAILABLE . SEE PAGE 128 pushrod drawing calls full tapering solution depth slot needed assembly Ailerons uniform thickness throughout length tapered narrow toward wing tip because possibility flutter high speeds springy constant chord type used should hard material Extreme flutter can hazardous ailerons soft enough twist Fuselage Some building practices fuselage may seem unorthodox Onesixteenth plywood used sides top rear bulkhead some formers much stronger a weighs about same Wherever thicker plywood speci fied itwas laminated layers 1/16 produce material greater strength standard 5-ply Decks nose section covered 1/32 plywood stronger balsa planking requires sealer color coats fine finish Block balsa used compound curves bottom nose section fiberglass nose cowl could August 1979 13 ____---.- WTh 6 ---------.ASEL SPORT 1- -________ 1 1 ARIEL SPORT .. F20 F22 F 17 F3 I/B PLYMXD COWL BACK F16 FORMED OVER BALSA OR FOAM CORE- REMED 3/32 PLYWO COWL cOVERING l/3 PLYWCOD HATCH TOP F5 KRAFT I2OZ TANK FIBERGLASS COWLING F4 l/4PLYWcOD FIREWALL 23/4 DA SPINNER SHORTENED SIG ALUMINUM ENGINE MOUNT 3A6 PLYWOOD BULKHEAD F 3 1/8 PLYWOOD COWL MOUNP CARL GOLDBERG TRI GEAR RETRACT MECHANISM W5 WING FILLET 1/16 PLYWOOD OVER 3/32BALSA LINER AROUND WHEEL WELL K SERO ON F 5 CONTROLS NOSE GEAR RETRACT I/I6X FORM BLOCKS 2 2 3/4 DIA MAIN WHEELS 2 2 1/2 DIA NOSE WHEEL 14 Modei Aviation I/I F19 F23 F15 3/8 BASS SERVO TRAY SUPPOR1 I/4PLYVOD CANC SUPPORT F8 3/16X I/2HATCH RAILS WEBRA 60 BLACK HEAD 2i 1 F1\ WING LE DOWEL 2 NOSE GEAR cOVER HATCH AND FRONT ANCHOR SCR/S 1/32 PLYWOOD COVER 4BALSA FIN LE/2 BALSA TIPS/8 X /4 RUDDER E 3/32BALSA FIN IBS1/4 HARD BALSA FIN SR 3/4 BALSA BLOCK DORSAL1/2 BALSA RUDDER SPAR FILLER BLOCK I 3/32 BALSA RIBS V2 SOFT BALSA BASE ACRYLIC SHEET 1G CArJOPY7iiiPJ TFORMED OR 1/2 BALSA SHEET ELEViIORS IA6 PLYWXJD OF LONGERONS PLYW0D DECK3/32 BALSA I/8SQ STRIPS FORMERS BEVELED BALSA F 6 TO F K -I 1/16 SHEET BALSA OVER FOCM 95/16 MED5/16SQSPRUCE SPAR5/8 BALSAT1P 1/4 3JFT BALSA BOTTOM1/4 SQ BALSA LONGERONS AND CROSS BRACES / I.1/8 MED BALSA SIDE PLANKING I/16PLvVKDD INSIDE DOUBLER TO FIREWALL I/8PLWCCO RUDDER BAR ON 1/4 PLYWCD BRACKET 3/850 MAPLE LG BEAMS WITH T-NUTS BASSvOJD WING MOUNT BLOCK AND NYLON SCREW 2 3/32 r&JSIC WIRE THRU BRASS TUBE TO AILERONS GLASS CLOTH OVER MID SECTION ONLY 5/16 X 1/2 HARDWCOD SPAR K HARD BALSA AILERONS p 1 1/16 WIRE L G RETRACT LINKAGE 4-40 SCREWS RENE RETRACT COVER ERG RETRT NISM MAINS 1/2 X TAPERED LEADING EDGE 3/32 SHEET PLANK TOP AND BOTTOMFOAM CORE 1/4 BALSA HOLLOWED FOR WING TIPS August 1979 15 Offset muffler adapter trick lower engine below top line cowl Note aluminum engine mount has trimmed fit shape cowl bulkhead below made conventional plaster mold cause its shape would have locked mold carved scrap block balsa made 1/16 inch undersize dimensions covered several layers fiberglass cloth epoxy polyester resin balsa hollowed out completely leaving fiberglass shell used small sanding drum electric drill quickly grind away balsa An alternate method carve sand shape foam plastic such remnants wing foam covered fiberglass epoxy polyester foam dissolved solvent lacquer thinner dope thinner methyl ethyl ketone leaving shell wood bulkhead epoxy glued rear cowl add stiffness serve mount drawing shows home-made en gine mount muffler adapter adapter cut angle permits mounting engine 15 degrees above horizontal straight adapter found mufflers would require angle increased about 30 degrees engine cylinder projects greater distance above cowl top reason angled adapter drawing engine mount bulkhead shows both 15- 30-degree hole loca Continued Goldberg retract mechanism foam wing hardwood rails Styrene plastic gear cover removed above Note hardwood tapped dowels epoxied wing cover hold-downs Close attention such extra refinements contributes feeling scale enhanced acrobatic ship 16 Model Aviation Fuel tank easily accessible cover removed Tank packed foam plastic forvibration insulation Small balsa ledges glued cover opening leveling cover Right Notched support aileron servo permits access mounting screws 180-degree retract servo Note disc output retract servo insure positive locking mechanism Arm-type out-put will flex break Doing things right avoids annoying troubles ThicK ruuoer nas plywooa norns ana sTranded steel wires controlneat light installa tion Elevator horn exposed convenient adjustment could hidden inside fuselage Dual elevator horns recommend split flip pers large orfast aircraftto avoid uneven responses introduce rolling moment KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals 10- 6 9- 7 Nashville Slow Rat 8- 8 Gillopt 8 8 Regular 8- 7 Regular 7 6 7 55 $650 $650 $500 $475 $475 $375 Graphite $500 - 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 TEAM RACE PROPS DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP lw/out counter balence Fiber $400 Graphite $500 DIESEL HEADS fit 15 engines $18 ORDER DlRECT 72 hour shipping cashiers checks money orders 10-day person al checks Money promptly refunded prop stock KELLY PRODUCTS INC P0 Box 38 Western Springs IL 60558 104 Model Aviation vide small portions time day presently 128 pages magazine staff consists five full-time nearly others AMA HQ also help outto equal almost 214 full-timers Schroder eve can finance prolect must cost ex cess $200000 nine months unfulfilled subscriptions Fact Income avail able unfilled subscriptions 1975 advertising etc amounted $204424 costs including printing salaries rent telephone etc came $201394for sur plus profit just over $3000 Schroder agic basis [$200000] figure costs fixed publisher am well aware what will chart An 80-page book 40000 circulation will cost mini mum $17000 printed will require $1500 worth typesetting $3500 2nd class postagefulfillment subscription costs include preparation cheshire strips $1000 editorial content fees $2500 Fact MA cir culation 40000 1975 closer 50000 Schroder way off cases actual averages print ing $11062 typesetting $1014 postage $1113 labels $445 editorial fees $3684 could person field years actually using same printer MA far off Amazing Schroder He [the AMA Executive Direc tor] says can print cheaper used conservative figures estimate Fact AMA Executive Direc tors cost figures based MA pub lishers gathering cost information coincided actual results Consider Walts motive 1975 professed m interests AMAto save extinction lack growth unaffordable magazine costs recom mendation kill magazine Consider Walt published readers letter early 1979 considering compensat ing income factors suggested wrongly MA used general AMA dues money magazine should killed newsletter substituted Walt published letter suppos edly right AMA members know didnt deliver promise print other AMAs side story lat est message its apparent still wants MA killedbut new reasoning faulty old Ariel Sport/Wischer continued page 16 tions aluminum engine mounts Other holes will affected fuel line muffler pressure line throttle pushrod Since fuselage bulk heads needed before fuselage construc tion can begin hole locations must decided upon Laminate fuselage sides 1/16 ply wood a using contact adhesive right side has cut-out muffler space Add -square balsa bracing fuselage rear preference sequence steps construction begins 1/16 plywood fuselage top adding i beveled balsa strips bulkheads F5 FlO followed prepared fuselage sides Add F2 F4 lower balsa nose blocks nose formers F 15 thru F24 including cover frame Follow tail post -sq cross bracing fuselage bottom top formers F6 thru F 14 -square cement strips -square former brace Make heavy paper templates plywood deck nose section assure good fit plywood soaked water its outer surface make pliable can easily formed around formers fastened place white glue Have plentiful supply heavy number 62 64 rubber bands hand applying pressure glue sets perfect joint necessity can easily leveled later Epoxolite care must exercised certain ply firm contact formers plywood covering process much easier appears description ease maintenance prefer make fu& tank nose-gear retract mechanism accessible removable covers bit forethought has already paid dividends cleaning adjustment Goldberg retract mechanism has quite free maintenance problems once ad justed according instructions es pecially locking down avoid gear collapsing landing Having broken sev eral servo output arms have switched discs would recommend some means adjusting pushrod length bend wire length brass tube soldered over break wire canopy shown fabricated 1/32 acrylic sheet Plexiglas stretch formed after heating kitchen oven 2500 F balsa form leftover previous plane windshield portion drape formed oven over aluminum sheet bent desired shape 15-in-long canopy lighter material approximately equal size available Sig Tail surfaces Stabilizer foam core cut templates hot-wire technique foam halves epoxy glued center covered 1/16 sheet balsa piece tip tip continuous sheet cover provides stronger center Leading trailing edges added sanded airfoil section shape Vertical fin built up ribs covered 1/16 sheet balsa rudder has open rib construction requiring silk plas tic film cover reduce weight weight saving tail rudder operated means steel control-line cable full-size planes could changed pushrod option builder Elevator controlled l pushrod brought out nylon elevator horn through fuselage side improved appearance horn could have metal brazed music wire elevator joiner center done clevis hole horn should 1 inch joiner wire Finishing Being old school RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1 /83/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE -$1000 PER SPOOL PPD IN US ADDITIONAL SPOOLS $950 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1400 PER HANK PPD IN US ADDITIONAL HANKS $1350 SOLE US DISTRIBUTOR AND WORLD WIDE SALES FAIModl Supply P0 Box 9778 Phoenix Arizona 85068 aircraft finishing continue use silk dope because like toughness strength resistance dents scratches ever structure does need added strength plastic film covering could used equal success make no effort obtain super finish complete struc ture given three heavy brushed coats clear dope minimum thinner added Silk applied wet over balsa surfaces plywood silk given five six brushed coats clear dope followed two coats very thin dope talcum powder mixture filler mixture contains too little thinner filler becomes difficult sand too much talc used finish will reticulate crack will also difficult sand because loads sand paper Using number 150 grade open-coat aluminum oxide paper talc will removed sanding leaving pores silk filled silk grain will plainly visible Two coats clear will seal talc prevent its bleeding through final color coats clear coats can either brushed sprayed Color coats follow use spray light finish Color used hide surface blemishes should non existent after talc sanding Since color adds weight keep color coats light density Plywood surfaces fiber glass cowl need minimum preparation Flying Check correct center gravity plane needed no addition weight its first flight also needed no trim change Retracting landing gear will have greater effect expected because large wheels contribute drag plane doesnt really need retracts could easily converted rigid gear substituting hardwood mounts wings stand ard tricycle nose gear Takeoff landing real pleasure nose gear length shown touch up elevator takeoff speed lifts nose gracefully tendency jump off As plane approaches ground landing up elevator fed gradually holding nose up touch-down rear wheels first no tendency wing tip drop during type landing used scale-like performance reduce speed minimum impact Control surface travel side cen ter follows elevator 11/16 aileron 3/16 rudder 1W low travel elevator aileron contributing fac tors smooth handling enjoy Ariel Sport Elevator needs travel sufficient amount lower tail takeoff landing aileron travel indicated plane will axial roll less two seconds wide rudder travel used execution stall turns Spins snap-roll maneuvers positive both entry recovery Inverted flight requires bit down elevator held really enjoy flying plane think will too RC Technique/Myers continued page 23 receiver Ordinarily servo hooked up active system doing nothing will draw between 5 15 ma will jump up something like 250 ma move stick transmitter servo able move freely servo trying work against hinges have accidently epoxied together current will go higher usually some between 400 500 ma servo needs cleaning will draw current usual doing nothing Thats because dirty servos usually jitter shiver about transmitter Most trans mitters use some kind special charging plug thats hard find expensive Therefore easiest thing cut wires charger clip meter before thing about approach unsatisfactory have re connect cut ends restore normal operation Since probably wont measuring transmitter charging current very often because wont tell much just solder cut ends together again cover piece tape will take time measure charging currents system new write measured values owners manual will some value checking time time current will drop below normal values August 1979 105 Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage Et handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 W WI MODEL ACCESSORIES FINE QUALITY ENGINE KITS & CYLINDERS MACHINE GUN KITS LS TS INGS SEND SOt FOR COMPLETE CATALOG DEPr MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA S 92069 [F Cuts Coverite gj4& Monokote better T other lade Lasts much CURVED MIC PROTECTSMCOVER &TABLETOPLETS YOU 8LAOE CARRY TRIMIT IN YOUR POCKET cells start drying out sign old age same reduction occurs have dirty connections fractured wires charg ing ioop other hand current will increase bit event have short-circuited cell somewhere pack Transmitters frequently operate long periods two shorted cells because resulting voltage loss doesnt reduce signal output critical level dont measure charging current about notice transmitter has charged frequently personal opinion charger should have reliable ammeter reason dont have cost cheap meters cost real money Since us have charger best alternative buy VOM make up handful adapters like described Thats month Keep letters coming George Myers 70 Froehlich Farm Rd Hicks yule NY 11801 ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new Pclass model designed ce mind has potential win toughest COnl-p-eIitrO-tr THE POTENT30 Deluse kit features include Rolled balsa tusela e wing mount dt Completed prop nose plu9 tail plug & rudder Precut wing ribsapar notches job rated balsa strips Highest quality tissue lubed contest rubber Detailed instructions flying tips help yoa wiel CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE N08 SACTO CALIF 95821 RC Soaring/Pruss Continued page 25 types thermal fliers well should noted wing root faced plywood another plywood rib three inches outboard provide support 5mm ID tubing accommodates main support wire three-function gliderrudder elevator moveable wingsnot ailerons moveable wings idea nothing new Bob Boucher ASW couple years back same function did others tried sake doing Some systems straight-forward others looked like innards slot machine French bird simple like things appear simple theyre result refinements Such case Axel Jean Claude Bosquet current French aerobatic champion refined design what see result four years development fuselage although aesthetically sleek appearance has flat sides parallel 1 Fiberglass fin Ipart fuselage 2 1/16 Plywood Stiffen fin expoxy 3 1/16VVireepoxy 4 1/l6VVireepoxv wire makes contact fin 5 1/16 Plywood drill out 3&4 6 Balsa rudder place 3 Ii II ii 4 1 0 5 B flatness ends trailing edge wing meets flatness allows mechanics kept simple airfoil design changed fuselage wing fillet giving away However having fillet fuselage tends weak wing trailing juncture Bosquet cleverly reinforced fuselage point epoxying plywood ring fuselage might seem like simple solution treating vulnerable spot Ive seen some filletless home designs werent beefed up area wing tip used first point touch-down trailing edge knifed fuselage leaving field repair made heart models wing moving ability lies specially molded bell cranks Bosquet developed Again simpleafter see themthey mount fuselage pivot common wire diameter Drive pins stick out fuselage slip wings just about two-thirds back leading edge wings held close fuselage onto wires rubber bands attached screw-in hooks wing roots rubber bands stretch behind main support rod point wing pivot thereby restricting wing movement provide wing fuselage clearance main support tube extends beyond fuselage sides 1/32 inch ends fuselage wing tubes provide al frictionless pivot point Slick As thermal competition fliers real ize reducing drag means time air know real hat sucker thermal will get ten-minute maxes manhole covers its dead air sleekness can mean seconds minutes sleekness means no ugly protuberances wide gaps can cause turbulence Sloppy fits around canopy fuselages can cost time Wide gaps just plain gaps around fuselage wing joints can induce drag point its worse doubling cross-section fuselage point dirtiest areas aerodynamically speaking sailplanes tail area its flying 106 Model Aviation
Edition: Model Aviation - 1979/08
Page Numbers: 10, 11, 12, 13, 14, 15, 16, 104, 105, 106
NO OCR TEXT NO OCR TEXT Top Scale-like engine cowl large canopy greater average fuselage depth pro vide approach realism Left Rudder bar right pic short pushrod servo cables rudder Above right Goldberg re tract nose gear installation rear firewall Retract 180-degree servo rear first bulk headdirect connecting rod betweensteering pushrod alongside Right Compare view tail surface actuation black white pic bottom view thick rudder wide fiberglass cloth bandage wrapped cemented around wing center sec tion using either polyester resin epoxy keeping mind resin erodes foam fiberglass will require some sanding blending filler its edges installation Goldberg retracts demands close attention instruction sheet music wire gear legs given set rearward direction assure wheels will fit wells after few hard landings instruction sheet specifies small hole operating 1 2 Model Aviation FULL SIZE PLANS AVAILABLE . SEE PAGE 128 pushrod drawing calls full tapering solution depth slot needed assembly Ailerons uniform thickness throughout length tapered narrow toward wing tip because possibility flutter high speeds springy constant chord type used should hard material Extreme flutter can hazardous ailerons soft enough twist Fuselage Some building practices fuselage may seem unorthodox Onesixteenth plywood used sides top rear bulkhead some formers much stronger a weighs about same Wherever thicker plywood speci fied itwas laminated layers 1/16 produce material greater strength standard 5-ply Decks nose section covered 1/32 plywood stronger balsa planking requires sealer color coats fine finish Block balsa used compound curves bottom nose section fiberglass nose cowl could August 1979 13 ____---.- WTh 6 ---------.ASEL SPORT 1- -________ 1 1 ARIEL SPORT .. F20 F22 F 17 F3 I/B PLYMXD COWL BACK F16 FORMED OVER BALSA OR FOAM CORE- REMED 3/32 PLYWO COWL cOVERING l/3 PLYWCOD HATCH TOP F5 KRAFT I2OZ TANK FIBERGLASS COWLING F4 l/4PLYWcOD FIREWALL 23/4 DA SPINNER SHORTENED SIG ALUMINUM ENGINE MOUNT 3A6 PLYWOOD BULKHEAD F 3 1/8 PLYWOOD COWL MOUNP CARL GOLDBERG TRI GEAR RETRACT MECHANISM W5 WING FILLET 1/16 PLYWOOD OVER 3/32BALSA LINER AROUND WHEEL WELL K SERO ON F 5 CONTROLS NOSE GEAR RETRACT I/I6X FORM BLOCKS 2 2 3/4 DIA MAIN WHEELS 2 2 1/2 DIA NOSE WHEEL 14 Modei Aviation I/I F19 F23 F15 3/8 BASS SERVO TRAY SUPPOR1 I/4PLYVOD CANC SUPPORT F8 3/16X I/2HATCH RAILS WEBRA 60 BLACK HEAD 2i 1 F1\ WING LE DOWEL 2 NOSE GEAR cOVER HATCH AND FRONT ANCHOR SCR/S 1/32 PLYWOOD COVER 4BALSA FIN LE/2 BALSA TIPS/8 X /4 RUDDER E 3/32BALSA FIN IBS1/4 HARD BALSA FIN SR 3/4 BALSA BLOCK DORSAL1/2 BALSA RUDDER SPAR FILLER BLOCK I 3/32 BALSA RIBS V2 SOFT BALSA BASE ACRYLIC SHEET 1G CArJOPY7iiiPJ TFORMED OR 1/2 BALSA SHEET ELEViIORS IA6 PLYWXJD OF LONGERONS PLYW0D DECK3/32 BALSA I/8SQ STRIPS FORMERS BEVELED BALSA F 6 TO F K -I 1/16 SHEET BALSA OVER FOCM 95/16 MED5/16SQSPRUCE SPAR5/8 BALSAT1P 1/4 3JFT BALSA BOTTOM1/4 SQ BALSA LONGERONS AND CROSS BRACES / I.1/8 MED BALSA SIDE PLANKING I/16PLvVKDD INSIDE DOUBLER TO FIREWALL I/8PLWCCO RUDDER BAR ON 1/4 PLYWCD BRACKET 3/850 MAPLE LG BEAMS WITH T-NUTS BASSvOJD WING MOUNT BLOCK AND NYLON SCREW 2 3/32 r&JSIC WIRE THRU BRASS TUBE TO AILERONS GLASS CLOTH OVER MID SECTION ONLY 5/16 X 1/2 HARDWCOD SPAR K HARD BALSA AILERONS p 1 1/16 WIRE L G RETRACT LINKAGE 4-40 SCREWS RENE RETRACT COVER ERG RETRT NISM MAINS 1/2 X TAPERED LEADING EDGE 3/32 SHEET PLANK TOP AND BOTTOMFOAM CORE 1/4 BALSA HOLLOWED FOR WING TIPS August 1979 15 Offset muffler adapter trick lower engine below top line cowl Note aluminum engine mount has trimmed fit shape cowl bulkhead below made conventional plaster mold cause its shape would have locked mold carved scrap block balsa made 1/16 inch undersize dimensions covered several layers fiberglass cloth epoxy polyester resin balsa hollowed out completely leaving fiberglass shell used small sanding drum electric drill quickly grind away balsa An alternate method carve sand shape foam plastic such remnants wing foam covered fiberglass epoxy polyester foam dissolved solvent lacquer thinner dope thinner methyl ethyl ketone leaving shell wood bulkhead epoxy glued rear cowl add stiffness serve mount drawing shows home-made en gine mount muffler adapter adapter cut angle permits mounting engine 15 degrees above horizontal straight adapter found mufflers would require angle increased about 30 degrees engine cylinder projects greater distance above cowl top reason angled adapter drawing engine mount bulkhead shows both 15- 30-degree hole loca Continued Goldberg retract mechanism foam wing hardwood rails Styrene plastic gear cover removed above Note hardwood tapped dowels epoxied wing cover hold-downs Close attention such extra refinements contributes feeling scale enhanced acrobatic ship 16 Model Aviation Fuel tank easily accessible cover removed Tank packed foam plastic forvibration insulation Small balsa ledges glued cover opening leveling cover Right Notched support aileron servo permits access mounting screws 180-degree retract servo Note disc output retract servo insure positive locking mechanism Arm-type out-put will flex break Doing things right avoids annoying troubles ThicK ruuoer nas plywooa norns ana sTranded steel wires controlneat light installa tion Elevator horn exposed convenient adjustment could hidden inside fuselage Dual elevator horns recommend split flip pers large orfast aircraftto avoid uneven responses introduce rolling moment KELLY PROPS Winningest Fiberglas Graphite Propellers U S Nationals 10- 6 9- 7 Nashville Slow Rat 8- 8 Gillopt 8 8 Regular 8- 7 Regular 7 6 7 55 $650 $650 $500 $475 $475 $375 Graphite $500 - 5% Willoughby $375 Graphite $500 6 7/8 52 Anderson Ballard Latest Version Mk-3 $375 Graphite $500 7 4 FAI Combat Prop $375 TEAM RACE PROPS DRAZEK NOVA JOHN GRAY Fiber $375 Graphite $500 ODDY ONE BLADE PROP lw/out counter balence Fiber $400 Graphite $500 DIESEL HEADS fit 15 engines $18 ORDER DlRECT 72 hour shipping cashiers checks money orders 10-day person al checks Money promptly refunded prop stock KELLY PRODUCTS INC P0 Box 38 Western Springs IL 60558 104 Model Aviation vide small portions time day presently 128 pages magazine staff consists five full-time nearly others AMA HQ also help outto equal almost 214 full-timers Schroder eve can finance prolect must cost ex cess $200000 nine months unfulfilled subscriptions Fact Income avail able unfilled subscriptions 1975 advertising etc amounted $204424 costs including printing salaries rent telephone etc came $201394for sur plus profit just over $3000 Schroder agic basis [$200000] figure costs fixed publisher am well aware what will chart An 80-page book 40000 circulation will cost mini mum $17000 printed will require $1500 worth typesetting $3500 2nd class postagefulfillment subscription costs include preparation cheshire strips $1000 editorial content fees $2500 Fact MA cir culation 40000 1975 closer 50000 Schroder way off cases actual averages print ing $11062 typesetting $1014 postage $1113 labels $445 editorial fees $3684 could person field years actually using same printer MA far off Amazing Schroder He [the AMA Executive Direc tor] says can print cheaper used conservative figures estimate Fact AMA Executive Direc tors cost figures based MA pub lishers gathering cost information coincided actual results Consider Walts motive 1975 professed m interests AMAto save extinction lack growth unaffordable magazine costs recom mendation kill magazine Consider Walt published readers letter early 1979 considering compensat ing income factors suggested wrongly MA used general AMA dues money magazine should killed newsletter substituted Walt published letter suppos edly right AMA members know didnt deliver promise print other AMAs side story lat est message its apparent still wants MA killedbut new reasoning faulty old Ariel Sport/Wischer continued page 16 tions aluminum engine mounts Other holes will affected fuel line muffler pressure line throttle pushrod Since fuselage bulk heads needed before fuselage construc tion can begin hole locations must decided upon Laminate fuselage sides 1/16 ply wood a using contact adhesive right side has cut-out muffler space Add -square balsa bracing fuselage rear preference sequence steps construction begins 1/16 plywood fuselage top adding i beveled balsa strips bulkheads F5 FlO followed prepared fuselage sides Add F2 F4 lower balsa nose blocks nose formers F 15 thru F24 including cover frame Follow tail post -sq cross bracing fuselage bottom top formers F6 thru F 14 -square cement strips -square former brace Make heavy paper templates plywood deck nose section assure good fit plywood soaked water its outer surface make pliable can easily formed around formers fastened place white glue Have plentiful supply heavy number 62 64 rubber bands hand applying pressure glue sets perfect joint necessity can easily leveled later Epoxolite care must exercised certain ply firm contact formers plywood covering process much easier appears description ease maintenance prefer make fu& tank nose-gear retract mechanism accessible removable covers bit forethought has already paid dividends cleaning adjustment Goldberg retract mechanism has quite free maintenance problems once ad justed according instructions es pecially locking down avoid gear collapsing landing Having broken sev eral servo output arms have switched discs would recommend some means adjusting pushrod length bend wire length brass tube soldered over break wire canopy shown fabricated 1/32 acrylic sheet Plexiglas stretch formed after heating kitchen oven 2500 F balsa form leftover previous plane windshield portion drape formed oven over aluminum sheet bent desired shape 15-in-long canopy lighter material approximately equal size available Sig Tail surfaces Stabilizer foam core cut templates hot-wire technique foam halves epoxy glued center covered 1/16 sheet balsa piece tip tip continuous sheet cover provides stronger center Leading trailing edges added sanded airfoil section shape Vertical fin built up ribs covered 1/16 sheet balsa rudder has open rib construction requiring silk plas tic film cover reduce weight weight saving tail rudder operated means steel control-line cable full-size planes could changed pushrod option builder Elevator controlled l pushrod brought out nylon elevator horn through fuselage side improved appearance horn could have metal brazed music wire elevator joiner center done clevis hole horn should 1 inch joiner wire Finishing Being old school RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1 /83/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE -$1000 PER SPOOL PPD IN US ADDITIONAL SPOOLS $950 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1400 PER HANK PPD IN US ADDITIONAL HANKS $1350 SOLE US DISTRIBUTOR AND WORLD WIDE SALES FAIModl Supply P0 Box 9778 Phoenix Arizona 85068 aircraft finishing continue use silk dope because like toughness strength resistance dents scratches ever structure does need added strength plastic film covering could used equal success make no effort obtain super finish complete struc ture given three heavy brushed coats clear dope minimum thinner added Silk applied wet over balsa surfaces plywood silk given five six brushed coats clear dope followed two coats very thin dope talcum powder mixture filler mixture contains too little thinner filler becomes difficult sand too much talc used finish will reticulate crack will also difficult sand because loads sand paper Using number 150 grade open-coat aluminum oxide paper talc will removed sanding leaving pores silk filled silk grain will plainly visible Two coats clear will seal talc prevent its bleeding through final color coats clear coats can either brushed sprayed Color coats follow use spray light finish Color used hide surface blemishes should non existent after talc sanding Since color adds weight keep color coats light density Plywood surfaces fiber glass cowl need minimum preparation Flying Check correct center gravity plane needed no addition weight its first flight also needed no trim change Retracting landing gear will have greater effect expected because large wheels contribute drag plane doesnt really need retracts could easily converted rigid gear substituting hardwood mounts wings stand ard tricycle nose gear Takeoff landing real pleasure nose gear length shown touch up elevator takeoff speed lifts nose gracefully tendency jump off As plane approaches ground landing up elevator fed gradually holding nose up touch-down rear wheels first no tendency wing tip drop during type landing used scale-like performance reduce speed minimum impact Control surface travel side cen ter follows elevator 11/16 aileron 3/16 rudder 1W low travel elevator aileron contributing fac tors smooth handling enjoy Ariel Sport Elevator needs travel sufficient amount lower tail takeoff landing aileron travel indicated plane will axial roll less two seconds wide rudder travel used execution stall turns Spins snap-roll maneuvers positive both entry recovery Inverted flight requires bit down elevator held really enjoy flying plane think will too RC Technique/Myers continued page 23 receiver Ordinarily servo hooked up active system doing nothing will draw between 5 15 ma will jump up something like 250 ma move stick transmitter servo able move freely servo trying work against hinges have accidently epoxied together current will go higher usually some between 400 500 ma servo needs cleaning will draw current usual doing nothing Thats because dirty servos usually jitter shiver about transmitter Most trans mitters use some kind special charging plug thats hard find expensive Therefore easiest thing cut wires charger clip meter before thing about approach unsatisfactory have re connect cut ends restore normal operation Since probably wont measuring transmitter charging current very often because wont tell much just solder cut ends together again cover piece tape will take time measure charging currents system new write measured values owners manual will some value checking time time current will drop below normal values August 1979 105 Please send mecopies new 5th edition Radio Control Buyers Guide Enclosed $825 copy ordered $725 retail plus $100 postage Et handling City State ZIP Return RC Buyers Guide Clifton House Clifton VA 22024 W WI MODEL ACCESSORIES FINE QUALITY ENGINE KITS & CYLINDERS MACHINE GUN KITS LS TS INGS SEND SOt FOR COMPLETE CATALOG DEPr MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA S 92069 [F Cuts Coverite gj4& Monokote better T other lade Lasts much CURVED MIC PROTECTSMCOVER &TABLETOPLETS YOU 8LAOE CARRY TRIMIT IN YOUR POCKET cells start drying out sign old age same reduction occurs have dirty connections fractured wires charg ing ioop other hand current will increase bit event have short-circuited cell somewhere pack Transmitters frequently operate long periods two shorted cells because resulting voltage loss doesnt reduce signal output critical level dont measure charging current about notice transmitter has charged frequently personal opinion charger should have reliable ammeter reason dont have cost cheap meters cost real money Since us have charger best alternative buy VOM make up handful adapters like described Thats month Keep letters coming George Myers 70 Froehlich Farm Rd Hicks yule NY 11801 ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new Pclass model designed ce mind has potential win toughest COnl-p-eIitrO-tr THE POTENT30 Deluse kit features include Rolled balsa tusela e wing mount dt Completed prop nose plu9 tail plug & rudder Precut wing ribsapar notches job rated balsa strips Highest quality tissue lubed contest rubber Detailed instructions flying tips help yoa wiel CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE N08 SACTO CALIF 95821 RC Soaring/Pruss Continued page 25 types thermal fliers well should noted wing root faced plywood another plywood rib three inches outboard provide support 5mm ID tubing accommodates main support wire three-function gliderrudder elevator moveable wingsnot ailerons moveable wings idea nothing new Bob Boucher ASW couple years back same function did others tried sake doing Some systems straight-forward others looked like innards slot machine French bird simple like things appear simple theyre result refinements Such case Axel Jean Claude Bosquet current French aerobatic champion refined design what see result four years development fuselage although aesthetically sleek appearance has flat sides parallel 1 Fiberglass fin Ipart fuselage 2 1/16 Plywood Stiffen fin expoxy 3 1/16VVireepoxy 4 1/l6VVireepoxv wire makes contact fin 5 1/16 Plywood drill out 3&4 6 Balsa rudder place 3 Ii II ii 4 1 0 5 B flatness ends trailing edge wing meets flatness allows mechanics kept simple airfoil design changed fuselage wing fillet giving away However having fillet fuselage tends weak wing trailing juncture Bosquet cleverly reinforced fuselage point epoxying plywood ring fuselage might seem like simple solution treating vulnerable spot Ive seen some filletless home designs werent beefed up area wing tip used first point touch-down trailing edge knifed fuselage leaving field repair made heart models wing moving ability lies specially molded bell cranks Bosquet developed Again simpleafter see themthey mount fuselage pivot common wire diameter Drive pins stick out fuselage slip wings just about two-thirds back leading edge wings held close fuselage onto wires rubber bands attached screw-in hooks wing roots rubber bands stretch behind main support rod point wing pivot thereby restricting wing movement provide wing fuselage clearance main support tube extends beyond fuselage sides 1/32 inch ends fuselage wing tubes provide al frictionless pivot point Slick As thermal competition fliers real ize reducing drag means time air know real hat sucker thermal will get ten-minute maxes manhole covers its dead air sleekness can mean seconds minutes sleekness means no ugly protuberances wide gaps can cause turbulence Sloppy fits around canopy fuselages can cost time Wide gaps just plain gaps around fuselage wing joints can induce drag point its worse doubling cross-section fuselage point dirtiest areas aerodynamically speaking sailplanes tail area its flying 106 Model Aviation