Radio Control SCALE Bob & Dolly Wischer SOLDERING AND BRAZING Soft sol dering lead-tin alloys common method joining steel brass parts Low joint-strength main disad vantage using ordinary solder Advan tages ease fabrication low tool cost relative ease repairs Joints can re-melted disassembled repair 100-watt soldering iron isnt really iron copper 150-watt solder gun will serve modeling purposes Corrosion oxides enemy soldering process Steel brass parts should cleaned abrasive such steel wool emery cloth sandpaper Most important soft soldered joint have sufficient area contact between metal parts Obviously soldering pair music wire landing gear legs area contact between wires approaches zero Adding solder bulky build-up does very little increase strength Soft solder its best used thin film between close-fitting parts such music wire inside tube tube inside another Melted solder will flow easily capillarity smallest space parts joined well-heated maximum strength crease area contact between mating parts ease flow solder avoid poor joint due oxidation flux applied areas covered solder Pre ferred flux mechanical joints elec trical connections non-corrosive paste such Nokorode Preferred solder greatest strength solid -in diameter wire resin core 50-50 grade equal parts tin lead Grade 60-40 60% lead usable has reduced strength costs less prove solder will wick through small spaces prepare short length music wire one-in-long close-fitting brass tube Coat wire tube interior lightly flux slide tube over wire Heat end tube solder gun resting element tip joint Apply solder joint watch bright melted solder ring appear other end tube using constant application heat Emergence ring indicates maximum-strength joint has formed Fastening two music-wire landing gear wires together solder alone will lead frustration wires need held position mechanical means assure long life joint can readily accomplished binding fine soft iron wire type sold hobby shops arts crafts beadwork wire tin-plated quick wetting molten solder portions music wires wraped 44 Model Aviation Curtiss Robin took 1st place Non-Military Scale Ralph Beck Chicago Expo spans 82 weighs 9 lb uses OS 50 power scratch-built Nieto plans finish silk nitrate dope overcoat epoxy Pollkarpov 1-16 Rats fighter WW II era trophy-winner Joe Spallone Chicago Expo Model 1/6-scale scratch-built all-balsa construction firnish glass cloth/resin Aero Gloss dope over silver epoxy base Robert Nuisingas Fairchild 24R pau wm fuselage modified scale width Its OS 90 drives prop through uu. -rduction belt-drive Wingspan 93 weIght 20 lb Finish K&B Superpoxy over Worid-Tex fabric soldered should roughly parallel greater strength joint partially flattened short length brass tube can sub stitute wraparound place iron wire -in OD tube will flatten en close two /sin-diameter music wires 5A6-in OD tube 5A2-in wires Length tube can little t music wires tube interior flux paste allow plenty time heat penetrate joint Brass tubing can made ductile flattening heating over burner kitchen stove contact red hot element electric stove butane torch will hasten annealing job After cooling air quenching water brass will yield oval shape effort scrap soft sheet brass annealed above required can also used wrap around two music wire legs has ad vantage legs need parallel can meet V shape suggestions intended increase area contact between metal parts joined solder prevent unwanted solder flowing along axle wire make dam punching snug-fitting hole thin cardboard Slipped over wire card board acts solder-stop Brazing techniques Large heavy Scale models need greater strength metal parts can built soft solder Bronze nickel-silver brazing alloys silver solder will provide sturdiness joints torch needed its size type depend upon volume metal heated Ordinary propane butane torches hardware store very inexpensive $5 $10 range including tank gas Continued page 139 An example bronze-rod brazing L sturdy landing gear frame uses 1k-in-diameter steel tube heavy musIc-wire brace tube shaped notching Tuf Grind wheel Moto Tool folding proper angle heavy-duty landing gear loint made soft soldering right An annealed brsss tube flattened fit music wire snuglytechnique Increases contact area solder February 1984 45 Epilogue subject aerodynamics bit complex have tried make seem intention articles try expose reader subject rational light fashionyet giving some useful formulas relationships ex ample say CL 10 typical models quite true general way effects aspect ratio air foil selection etc can change some what some critics have loudly indicated such criticism must reply am trying take complicated subject put fairly simple terms can digested average reader hope discussion Lift Equation has interest want know about design Questions comments may ad dressed Brad Powers 5470 Castle Hills Dr San Diego CA 92109 RC Scale/Wischers Continued page 45 Light steel parts can brazed 23000 F flame either kind gas heavier metal such l/.in.diameter steel tube landing gears torch suitable use MAPP methyl acetylene pro padiene gas preferred Its flame tempera ture used appropriate torch such Master Mechanic Whirlwind $24 36000 F gas about three times expensive propane s2n3 New Standard Giant Models 28 HP Lbs Send $100 Catalog 149 Direct Sales Only PIns hippsg Work Horse rel7fl 96 IORITZ 2a4 32 HP 6A Lbs III Dealer Direct PIns sblppiq Now Distribute Sachs-Dolmar Engines Yeager Machines TO RUN INCLUDING 6 BOLT PROP HUB AVAILABLE AT EXTRA CHARGE Nm ___ ___ NGINERear 340w Cleveland Isve. SW EU EEECanton OH 44707I IC DIVISIONPhone 216484-6810 48443741 job finished time because intensely hot flame actual cost per joint remains about same /2-in -diameter 035-in -wall aircraft steel tube brought red heat ready brazing bronze rod about ten seconds out red heat steel brazed bronze rod brazing alloy will melt flow uniformly around joint Insufficient heat primary reason lack success brazing Whirlwind torch has pres sure adjustment permits its use propane butane gases lowertemperature brazing maximum joint strength brazing Continued page 142 VXPHONE 6194424838 -h/pates 469-8675 BOX 2498-MALA MESA CA 92041 1 Great Trainers Send $150 complete Kit Catalog p Midwest Products C. Inc 400 S Indiana St PO Box 564-T Hobart 46342 83 t03l February 1984 139 BL ILAP4 MAILABLE IN TWO 1/4 Scale 90 to2EngInes 1 60EngIne EOPWITH TABLOIDI/ASeal77 Span524OOppUSA EOPWlTI4 TABLOID2V —I64 Span$1BOOppUSA 016 TEXAN41101 Span$27tOppUSA POSKEB DRI27 I63 Trip$2SOOppUSA F4U COESAIB2 I93 Span$27tppUSA CUBTISS p402 I94 Span$27OOppUSA FM BEAECAT2 —196 Span$2700 ppUSA Fiberglass COwlingS & Canopies available Send Stamp detailed Brochures oar Giant Scale AccessarreS Forego Orders Please add 254 POstage & Handling Nick Ziroli 29 Edgar Drive Smlthtowfl NY 11787 USA Brazing heavy metals Use Whirlwind Torch L stank stabilized acetylene gas lighter work use Microfiame torch R butane oxidizer cylinders sliver solder C02 ENGINES WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE IAOWNTEL LO A23 PEANUT $2996STANDARD TELCO$2400 CAMPUS BEE $2495TURBO 300092295 CAMPUS TWiN- $5995TURBO 800093900 SODACHARGER $1200 MVIS- COX 02 CONVERSION TO CO2$3900 NEWt C4T4LOG No 25 $150 Classic R/C Scale LAKES TH G4Qr Wing 15 25 Engines Dealers & Distributors Welcomed Phone 703 273-9593 FLYLINE MODELS INC PO Boa 2136 Pairfars VirginIa 22021 USA RC ScalelWischers Continued naae 139 alloys should employed described soft solder flow small space between close-fitting parts Quality bicycle frames assembled method molten brass bronze filling small gap between frame tubes malleable iron fit tings Actually modeling purposes butt joints substantial fillet bronze sufficiently strong Bronze nickel-silver alloy brazing rods have flux coating melts along rod heated Cost about 75 18-in rod will make joints Aircraft 4130 chrome-molybdenum steel tube comes black mill coating must removed emery aluminum oxide cloth before brazing metals need bright best flow bronze Music wire will braze well cleaning except wipe off oil preservative tense heat will affect its temper bit may wise use next larger size joint brought up red heat bronze rod tip introduced flame will melt flow matter few seconds form smooth fillet around joint inexperienced will find joy use After cooling will black glazed residue coating can chipped off lightly tapping small hammer other tool After glass-like glaze removed joint polished strip emery cloth excess bronze can filed off necessary proper quantity bronze applied filing isnt really required Holding parts joined brazing can problem because intense heatflow Unlike soft soldering parts cant held wooden clothespins would char ignite Parts can inserted dry sand metal box hold alignment have also used steel blocks metal work surface primitive fixturing Wear eye protection Hardware stores also have aluminumalloy brazing rods dont require flux melt about 8000 F Cost about 4O 18-in rod Light fabricated alu minum parts models would melt about 12000 F torch using MAPP gas would destroy workpiece best re sults parts use propane butane heat source brazing heavier alu minum sections such engine mounts heat conducted away mass workpiece MAPP gas Whirlwind torch will job Aluminum brazing rod especially serviceable making up spe cial mufflers fit odd spaces Scale model engine cowls Microflame torch handy addition Scale modelers workshop Its 50000 F flame can used brazing welding dont expect heavy work with its largest flame tip Its best use purpose silver soldering small parts brazing rod gold-silver alloy containing cadmium flux core silver alloy requires addition flux gold-silver rods /i2-in dia 6-in long very expensive about $350 arent really intended largequantity applications Silver alloy rods same size less expensive about $1 Microflame torch uses two gas cylin ders containing butane other oxidizer nitrous oxide cylinders small sparklet type both fitted frame control valves palm-size oxide consumed about three times rate butane Cylinders ex pensive about $190 butane $120 oxidizer life short Once cylinders have pierced torch frame wise have enough jobs lined up con sume gas month week later always seem empty due leakage though instruction sheet says will occur fac tor could make cost per joint quite high silver soldering base metal brought up brazing temperature red heat rod applied hot metal will melt flow joint Two different metals can joined provided melting points above 11000 F should no large gaps joint filled melted rod Poor joints will result base metal isnt abso 142 Model Aviation L P0 BOX 3957TORRANCE CA90510 FEA TURES * Fun high speed per formance lands like trainer * Strong balsa con struction * Full scale plans MAGUS LTA mixer included * 3-years design 10 Engine pan flight testing $2695 WePayShipping MI residents add 4% tax Send Certified Check MO Magus Model Aircraft 3518 Laurel Burton Michigan 48529 ATTENTION OP.S Engines & Parts Available Racing Marine Use OPS 15 / Quarter Midget 0 PS 45 Marine PLUS Custom TD 049/051 engine parts Complete inventory stock custom parts COX TD 0491051 engines complete Information send $1 P & G Metal Products 301 North Yale Drive Garland TX 75042 Gene Hempell214 2725210 after 600 PMJ FAI RUBBER Sizes 1/4 3/16 1/8 3/32 1/16 lmmthick042 Boxed 16 oz rubber per box Price $1250 per box ppd USA calif residents add 6% sales tan Coupe de VI lie $2395 plus us Finished prop Very very complete SEND 506 FOR 1984/1985 CATALOG FAJ Model Supply Sunday flying pattern trainer fun fly con tests Youll thrilled flight perform ancel balsa construction See review AprIl 83 RCM issue Engine 40-51 Wing Area 600 sqin Weight S lbs Radio 4 channel SpecIal offer $4994 & $300 shipping CA res odd 6% RICKS KITS POles 1106 Santee CA 920716194493316 lutely clean fingerprints may make joint impossible Only tip brazing rod fed flame puddle molten solder well-fitted joint very little rod required helps reduce cost 50000 F flame held spot base metal hole may burned through Melting points commonly-used metals Steel 25000 brass 18000 bronze 16750 copper 19800 zinc 7870 aluminum 12180 F Mi croflame torch shouldnt used join parts larger about I-in X 2-in x /6-in thick Larger parts will conduct heat away too rapidly fuel suply con sumed before brazing temperature reached bronze brazing rod will fill larger gaps silver solder other welding brazing torches available will much heav ier work employing combinations oxy gen acetylene propane Cost gen erally much higher simpler single-tank systems described arent commonly utilized Scale modelers cause dont need high-strength -quality joints capable producing Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Soaring/Pruss "' ~ oaae 47 back building Sailplanes Hes build ing winches sale plans arent avail able since didnt have built However scribe has parts list youre interested trying Best ShowWinch Divisionat next meet send SASE address end column photo parts list should get way way USA teams backup winch little doodad picture shows aileron doodad clever hinging arrangements could put control surface specifically flaps flaperons ailerons also provides smoothest action cleanest gap line could hope achieve As matter fact no gap See photo TIGER TAIL 4 Ron Chidgeys latest and beat series little larger lighter slower retains honest tlight character tistics ot its predecessors Especially recommended sportsman ad vanced pattern also good choice turn-around pattern Plans construction hints WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile selflocking 3116 width wont cut Vsilicone couplers Pkg 4 clamps $295 deflected aileron notice joint tween wing hinging arrangement Dohle popular highperformance Sailplanes land Porches Leicas current F3B World Champion hinge simpleassuming use aluminum tube leading edge control surface hinge ar rangement shown merely piece wooden dowel covered sec tion Teflon tubing tubing mates ID aluminum tube Only three hinge points necessary short aileron long flaperon Notches filed aluminum tubing allow movement hinge pins depth notches determines amount control surface movement available assembly Teflon-coated pieces fed through aluminum tubing notched locations Small-diameter wood screws screwed dowels slots heads screws cut off shank ends what left threaded ends buried epoxiedin NEW WINGTUBE&SOCKETS 1 dia aluminum alloy tubing plugin wings Included pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $895/set NEW NEW Sleeve Puller $795 BearIng Puller -$695 ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone espanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing *Speclal* Both $1395 See Dealer Order DIrect Include 75 Per Item f UPS Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 example shownin wing course matched concave section has fash ioned affect gapless fit should noted once control surface tached wing attachment per manent Now few words about using alu minum tubing perfect hinge joints Since wings taper both span thickness ailerons flaps usually taper proportion wing stands reason hinge line also tapers thickness since diameter aluminum tubing constant have problem matching perfect concave/ convex joint tubing sticking above airfoil like wart beauty queens nose constant-chord wing would pose no problem As matter fact wing inner panels taper flap installation would snap However tapered-wing problem can resolved few aerodynamic compromises Since has work around problem constant-diameter tube Continued page 146 3-FUNCTION ACCU-TACH ITM O LCD Tachometer w/dual scale capability lox bOX Digital Voltmeter load 1566 checking/cycling TX/RX battery combosACCIbThCJd tor quick arging operation 7fl95 prepaid Send check Nor y order Calif add 6% tax P0 Box 70956 Sunnyvale CA IN94086 ModellerS FREE Z Catalog IFROMI IMicroMark Small Tool Specialists Hundreds unusual lools Iborrowed lmmlIieJewClrfI IGuesmilbing Clock Making protensional Model MakingI trades NOW AVAILABLETO YOU MAIL100% gearaoteedlI IeijI II NAME___________-~~—I nowssI CITY ____________________________________ STATE ICIOMRK4ex 51 t 2 JQ24 East Mole St.Cllntgii NJ aenon J February 1984 143 EVERY DETAIL GREAT SCALE FLiUSI PERFORMS ALL THE MANEUVERS OF lOt IN wINGSPAN 75 Lea USING 56 ENGII JR I COMPLETE KIT LESS WAEEU$22000 SHiF
Edition: Model Aviation - 1984/02
Page Numbers: 44, 45, 135, 138, 139
Radio Control SCALE Bob & Dolly Wischer SOLDERING AND BRAZING Soft sol dering lead-tin alloys common method joining steel brass parts Low joint-strength main disad vantage using ordinary solder Advan tages ease fabrication low tool cost relative ease repairs Joints can re-melted disassembled repair 100-watt soldering iron isnt really iron copper 150-watt solder gun will serve modeling purposes Corrosion oxides enemy soldering process Steel brass parts should cleaned abrasive such steel wool emery cloth sandpaper Most important soft soldered joint have sufficient area contact between metal parts Obviously soldering pair music wire landing gear legs area contact between wires approaches zero Adding solder bulky build-up does very little increase strength Soft solder its best used thin film between close-fitting parts such music wire inside tube tube inside another Melted solder will flow easily capillarity smallest space parts joined well-heated maximum strength crease area contact between mating parts ease flow solder avoid poor joint due oxidation flux applied areas covered solder Pre ferred flux mechanical joints elec trical connections non-corrosive paste such Nokorode Preferred solder greatest strength solid -in diameter wire resin core 50-50 grade equal parts tin lead Grade 60-40 60% lead usable has reduced strength costs less prove solder will wick through small spaces prepare short length music wire one-in-long close-fitting brass tube Coat wire tube interior lightly flux slide tube over wire Heat end tube solder gun resting element tip joint Apply solder joint watch bright melted solder ring appear other end tube using constant application heat Emergence ring indicates maximum-strength joint has formed Fastening two music-wire landing gear wires together solder alone will lead frustration wires need held position mechanical means assure long life joint can readily accomplished binding fine soft iron wire type sold hobby shops arts crafts beadwork wire tin-plated quick wetting molten solder portions music wires wraped 44 Model Aviation Curtiss Robin took 1st place Non-Military Scale Ralph Beck Chicago Expo spans 82 weighs 9 lb uses OS 50 power scratch-built Nieto plans finish silk nitrate dope overcoat epoxy Pollkarpov 1-16 Rats fighter WW II era trophy-winner Joe Spallone Chicago Expo Model 1/6-scale scratch-built all-balsa construction firnish glass cloth/resin Aero Gloss dope over silver epoxy base Robert Nuisingas Fairchild 24R pau wm fuselage modified scale width Its OS 90 drives prop through uu. -rduction belt-drive Wingspan 93 weIght 20 lb Finish K&B Superpoxy over Worid-Tex fabric soldered should roughly parallel greater strength joint partially flattened short length brass tube can sub stitute wraparound place iron wire -in OD tube will flatten en close two /sin-diameter music wires 5A6-in OD tube 5A2-in wires Length tube can little t music wires tube interior flux paste allow plenty time heat penetrate joint Brass tubing can made ductile flattening heating over burner kitchen stove contact red hot element electric stove butane torch will hasten annealing job After cooling air quenching water brass will yield oval shape effort scrap soft sheet brass annealed above required can also used wrap around two music wire legs has ad vantage legs need parallel can meet V shape suggestions intended increase area contact between metal parts joined solder prevent unwanted solder flowing along axle wire make dam punching snug-fitting hole thin cardboard Slipped over wire card board acts solder-stop Brazing techniques Large heavy Scale models need greater strength metal parts can built soft solder Bronze nickel-silver brazing alloys silver solder will provide sturdiness joints torch needed its size type depend upon volume metal heated Ordinary propane butane torches hardware store very inexpensive $5 $10 range including tank gas Continued page 139 An example bronze-rod brazing L sturdy landing gear frame uses 1k-in-diameter steel tube heavy musIc-wire brace tube shaped notching Tuf Grind wheel Moto Tool folding proper angle heavy-duty landing gear loint made soft soldering right An annealed brsss tube flattened fit music wire snuglytechnique Increases contact area solder February 1984 45 Epilogue subject aerodynamics bit complex have tried make seem intention articles try expose reader subject rational light fashionyet giving some useful formulas relationships ex ample say CL 10 typical models quite true general way effects aspect ratio air foil selection etc can change some what some critics have loudly indicated such criticism must reply am trying take complicated subject put fairly simple terms can digested average reader hope discussion Lift Equation has interest want know about design Questions comments may ad dressed Brad Powers 5470 Castle Hills Dr San Diego CA 92109 RC Scale/Wischers Continued page 45 Light steel parts can brazed 23000 F flame either kind gas heavier metal such l/.in.diameter steel tube landing gears torch suitable use MAPP methyl acetylene pro padiene gas preferred Its flame tempera ture used appropriate torch such Master Mechanic Whirlwind $24 36000 F gas about three times expensive propane s2n3 New Standard Giant Models 28 HP Lbs Send $100 Catalog 149 Direct Sales Only PIns hippsg Work Horse rel7fl 96 IORITZ 2a4 32 HP 6A Lbs III Dealer Direct PIns sblppiq Now Distribute Sachs-Dolmar Engines Yeager Machines TO RUN INCLUDING 6 BOLT PROP HUB AVAILABLE AT EXTRA CHARGE Nm ___ ___ NGINERear 340w Cleveland Isve. SW EU EEECanton OH 44707I IC DIVISIONPhone 216484-6810 48443741 job finished time because intensely hot flame actual cost per joint remains about same /2-in -diameter 035-in -wall aircraft steel tube brought red heat ready brazing bronze rod about ten seconds out red heat steel brazed bronze rod brazing alloy will melt flow uniformly around joint Insufficient heat primary reason lack success brazing Whirlwind torch has pres sure adjustment permits its use propane butane gases lowertemperature brazing maximum joint strength brazing Continued page 142 VXPHONE 6194424838 -h/pates 469-8675 BOX 2498-MALA MESA CA 92041 1 Great Trainers Send $150 complete Kit Catalog p Midwest Products C. Inc 400 S Indiana St PO Box 564-T Hobart 46342 83 t03l February 1984 139 BL ILAP4 MAILABLE IN TWO 1/4 Scale 90 to2EngInes 1 60EngIne EOPWITH TABLOIDI/ASeal77 Span524OOppUSA EOPWlTI4 TABLOID2V —I64 Span$1BOOppUSA 016 TEXAN41101 Span$27tOppUSA POSKEB DRI27 I63 Trip$2SOOppUSA F4U COESAIB2 I93 Span$27tppUSA CUBTISS p402 I94 Span$27OOppUSA FM BEAECAT2 —196 Span$2700 ppUSA Fiberglass COwlingS & Canopies available Send Stamp detailed Brochures oar Giant Scale AccessarreS Forego Orders Please add 254 POstage & Handling Nick Ziroli 29 Edgar Drive Smlthtowfl NY 11787 USA Brazing heavy metals Use Whirlwind Torch L stank stabilized acetylene gas lighter work use Microfiame torch R butane oxidizer cylinders sliver solder C02 ENGINES WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE IAOWNTEL LO A23 PEANUT $2996STANDARD TELCO$2400 CAMPUS BEE $2495TURBO 300092295 CAMPUS TWiN- $5995TURBO 800093900 SODACHARGER $1200 MVIS- COX 02 CONVERSION TO CO2$3900 NEWt C4T4LOG No 25 $150 Classic R/C Scale LAKES TH G4Qr Wing 15 25 Engines Dealers & Distributors Welcomed Phone 703 273-9593 FLYLINE MODELS INC PO Boa 2136 Pairfars VirginIa 22021 USA RC ScalelWischers Continued naae 139 alloys should employed described soft solder flow small space between close-fitting parts Quality bicycle frames assembled method molten brass bronze filling small gap between frame tubes malleable iron fit tings Actually modeling purposes butt joints substantial fillet bronze sufficiently strong Bronze nickel-silver alloy brazing rods have flux coating melts along rod heated Cost about 75 18-in rod will make joints Aircraft 4130 chrome-molybdenum steel tube comes black mill coating must removed emery aluminum oxide cloth before brazing metals need bright best flow bronze Music wire will braze well cleaning except wipe off oil preservative tense heat will affect its temper bit may wise use next larger size joint brought up red heat bronze rod tip introduced flame will melt flow matter few seconds form smooth fillet around joint inexperienced will find joy use After cooling will black glazed residue coating can chipped off lightly tapping small hammer other tool After glass-like glaze removed joint polished strip emery cloth excess bronze can filed off necessary proper quantity bronze applied filing isnt really required Holding parts joined brazing can problem because intense heatflow Unlike soft soldering parts cant held wooden clothespins would char ignite Parts can inserted dry sand metal box hold alignment have also used steel blocks metal work surface primitive fixturing Wear eye protection Hardware stores also have aluminumalloy brazing rods dont require flux melt about 8000 F Cost about 4O 18-in rod Light fabricated alu minum parts models would melt about 12000 F torch using MAPP gas would destroy workpiece best re sults parts use propane butane heat source brazing heavier alu minum sections such engine mounts heat conducted away mass workpiece MAPP gas Whirlwind torch will job Aluminum brazing rod especially serviceable making up spe cial mufflers fit odd spaces Scale model engine cowls Microflame torch handy addition Scale modelers workshop Its 50000 F flame can used brazing welding dont expect heavy work with its largest flame tip Its best use purpose silver soldering small parts brazing rod gold-silver alloy containing cadmium flux core silver alloy requires addition flux gold-silver rods /i2-in dia 6-in long very expensive about $350 arent really intended largequantity applications Silver alloy rods same size less expensive about $1 Microflame torch uses two gas cylin ders containing butane other oxidizer nitrous oxide cylinders small sparklet type both fitted frame control valves palm-size oxide consumed about three times rate butane Cylinders ex pensive about $190 butane $120 oxidizer life short Once cylinders have pierced torch frame wise have enough jobs lined up con sume gas month week later always seem empty due leakage though instruction sheet says will occur fac tor could make cost per joint quite high silver soldering base metal brought up brazing temperature red heat rod applied hot metal will melt flow joint Two different metals can joined provided melting points above 11000 F should no large gaps joint filled melted rod Poor joints will result base metal isnt abso 142 Model Aviation L P0 BOX 3957TORRANCE CA90510 FEA TURES * Fun high speed per formance lands like trainer * Strong balsa con struction * Full scale plans MAGUS LTA mixer included * 3-years design 10 Engine pan flight testing $2695 WePayShipping MI residents add 4% tax Send Certified Check MO Magus Model Aircraft 3518 Laurel Burton Michigan 48529 ATTENTION OP.S Engines & Parts Available Racing Marine Use OPS 15 / Quarter Midget 0 PS 45 Marine PLUS Custom TD 049/051 engine parts Complete inventory stock custom parts COX TD 0491051 engines complete Information send $1 P & G Metal Products 301 North Yale Drive Garland TX 75042 Gene Hempell214 2725210 after 600 PMJ FAI RUBBER Sizes 1/4 3/16 1/8 3/32 1/16 lmmthick042 Boxed 16 oz rubber per box Price $1250 per box ppd USA calif residents add 6% sales tan Coupe de VI lie $2395 plus us Finished prop Very very complete SEND 506 FOR 1984/1985 CATALOG FAJ Model Supply Sunday flying pattern trainer fun fly con tests Youll thrilled flight perform ancel balsa construction See review AprIl 83 RCM issue Engine 40-51 Wing Area 600 sqin Weight S lbs Radio 4 channel SpecIal offer $4994 & $300 shipping CA res odd 6% RICKS KITS POles 1106 Santee CA 920716194493316 lutely clean fingerprints may make joint impossible Only tip brazing rod fed flame puddle molten solder well-fitted joint very little rod required helps reduce cost 50000 F flame held spot base metal hole may burned through Melting points commonly-used metals Steel 25000 brass 18000 bronze 16750 copper 19800 zinc 7870 aluminum 12180 F Mi croflame torch shouldnt used join parts larger about I-in X 2-in x /6-in thick Larger parts will conduct heat away too rapidly fuel suply con sumed before brazing temperature reached bronze brazing rod will fill larger gaps silver solder other welding brazing torches available will much heav ier work employing combinations oxy gen acetylene propane Cost gen erally much higher simpler single-tank systems described arent commonly utilized Scale modelers cause dont need high-strength -quality joints capable producing Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Soaring/Pruss "' ~ oaae 47 back building Sailplanes Hes build ing winches sale plans arent avail able since didnt have built However scribe has parts list youre interested trying Best ShowWinch Divisionat next meet send SASE address end column photo parts list should get way way USA teams backup winch little doodad picture shows aileron doodad clever hinging arrangements could put control surface specifically flaps flaperons ailerons also provides smoothest action cleanest gap line could hope achieve As matter fact no gap See photo TIGER TAIL 4 Ron Chidgeys latest and beat series little larger lighter slower retains honest tlight character tistics ot its predecessors Especially recommended sportsman ad vanced pattern also good choice turn-around pattern Plans construction hints WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile selflocking 3116 width wont cut Vsilicone couplers Pkg 4 clamps $295 deflected aileron notice joint tween wing hinging arrangement Dohle popular highperformance Sailplanes land Porches Leicas current F3B World Champion hinge simpleassuming use aluminum tube leading edge control surface hinge ar rangement shown merely piece wooden dowel covered sec tion Teflon tubing tubing mates ID aluminum tube Only three hinge points necessary short aileron long flaperon Notches filed aluminum tubing allow movement hinge pins depth notches determines amount control surface movement available assembly Teflon-coated pieces fed through aluminum tubing notched locations Small-diameter wood screws screwed dowels slots heads screws cut off shank ends what left threaded ends buried epoxiedin NEW WINGTUBE&SOCKETS 1 dia aluminum alloy tubing plugin wings Included pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $895/set NEW NEW Sleeve Puller $795 BearIng Puller -$695 ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone espanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing *Speclal* Both $1395 See Dealer Order DIrect Include 75 Per Item f UPS Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 example shownin wing course matched concave section has fash ioned affect gapless fit should noted once control surface tached wing attachment per manent Now few words about using alu minum tubing perfect hinge joints Since wings taper both span thickness ailerons flaps usually taper proportion wing stands reason hinge line also tapers thickness since diameter aluminum tubing constant have problem matching perfect concave/ convex joint tubing sticking above airfoil like wart beauty queens nose constant-chord wing would pose no problem As matter fact wing inner panels taper flap installation would snap However tapered-wing problem can resolved few aerodynamic compromises Since has work around problem constant-diameter tube Continued page 146 3-FUNCTION ACCU-TACH ITM O LCD Tachometer w/dual scale capability lox bOX Digital Voltmeter load 1566 checking/cycling TX/RX battery combosACCIbThCJd tor quick arging operation 7fl95 prepaid Send check Nor y order Calif add 6% tax P0 Box 70956 Sunnyvale CA IN94086 ModellerS FREE Z Catalog IFROMI IMicroMark Small Tool Specialists Hundreds unusual lools Iborrowed lmmlIieJewClrfI IGuesmilbing Clock Making protensional Model MakingI trades NOW AVAILABLETO YOU MAIL100% gearaoteedlI IeijI II NAME___________-~~—I nowssI CITY ____________________________________ STATE ICIOMRK4ex 51 t 2 JQ24 East Mole St.Cllntgii NJ aenon J February 1984 143 EVERY DETAIL GREAT SCALE FLiUSI PERFORMS ALL THE MANEUVERS OF lOt IN wINGSPAN 75 Lea USING 56 ENGII JR I COMPLETE KIT LESS WAEEU$22000 SHiF
Edition: Model Aviation - 1984/02
Page Numbers: 44, 45, 135, 138, 139
Radio Control SCALE Bob & Dolly Wischer SOLDERING AND BRAZING Soft sol dering lead-tin alloys common method joining steel brass parts Low joint-strength main disad vantage using ordinary solder Advan tages ease fabrication low tool cost relative ease repairs Joints can re-melted disassembled repair 100-watt soldering iron isnt really iron copper 150-watt solder gun will serve modeling purposes Corrosion oxides enemy soldering process Steel brass parts should cleaned abrasive such steel wool emery cloth sandpaper Most important soft soldered joint have sufficient area contact between metal parts Obviously soldering pair music wire landing gear legs area contact between wires approaches zero Adding solder bulky build-up does very little increase strength Soft solder its best used thin film between close-fitting parts such music wire inside tube tube inside another Melted solder will flow easily capillarity smallest space parts joined well-heated maximum strength crease area contact between mating parts ease flow solder avoid poor joint due oxidation flux applied areas covered solder Pre ferred flux mechanical joints elec trical connections non-corrosive paste such Nokorode Preferred solder greatest strength solid -in diameter wire resin core 50-50 grade equal parts tin lead Grade 60-40 60% lead usable has reduced strength costs less prove solder will wick through small spaces prepare short length music wire one-in-long close-fitting brass tube Coat wire tube interior lightly flux slide tube over wire Heat end tube solder gun resting element tip joint Apply solder joint watch bright melted solder ring appear other end tube using constant application heat Emergence ring indicates maximum-strength joint has formed Fastening two music-wire landing gear wires together solder alone will lead frustration wires need held position mechanical means assure long life joint can readily accomplished binding fine soft iron wire type sold hobby shops arts crafts beadwork wire tin-plated quick wetting molten solder portions music wires wraped 44 Model Aviation Curtiss Robin took 1st place Non-Military Scale Ralph Beck Chicago Expo spans 82 weighs 9 lb uses OS 50 power scratch-built Nieto plans finish silk nitrate dope overcoat epoxy Pollkarpov 1-16 Rats fighter WW II era trophy-winner Joe Spallone Chicago Expo Model 1/6-scale scratch-built all-balsa construction firnish glass cloth/resin Aero Gloss dope over silver epoxy base Robert Nuisingas Fairchild 24R pau wm fuselage modified scale width Its OS 90 drives prop through uu. -rduction belt-drive Wingspan 93 weIght 20 lb Finish K&B Superpoxy over Worid-Tex fabric soldered should roughly parallel greater strength joint partially flattened short length brass tube can sub stitute wraparound place iron wire -in OD tube will flatten en close two /sin-diameter music wires 5A6-in OD tube 5A2-in wires Length tube can little t music wires tube interior flux paste allow plenty time heat penetrate joint Brass tubing can made ductile flattening heating over burner kitchen stove contact red hot element electric stove butane torch will hasten annealing job After cooling air quenching water brass will yield oval shape effort scrap soft sheet brass annealed above required can also used wrap around two music wire legs has ad vantage legs need parallel can meet V shape suggestions intended increase area contact between metal parts joined solder prevent unwanted solder flowing along axle wire make dam punching snug-fitting hole thin cardboard Slipped over wire card board acts solder-stop Brazing techniques Large heavy Scale models need greater strength metal parts can built soft solder Bronze nickel-silver brazing alloys silver solder will provide sturdiness joints torch needed its size type depend upon volume metal heated Ordinary propane butane torches hardware store very inexpensive $5 $10 range including tank gas Continued page 139 An example bronze-rod brazing L sturdy landing gear frame uses 1k-in-diameter steel tube heavy musIc-wire brace tube shaped notching Tuf Grind wheel Moto Tool folding proper angle heavy-duty landing gear loint made soft soldering right An annealed brsss tube flattened fit music wire snuglytechnique Increases contact area solder February 1984 45 Epilogue subject aerodynamics bit complex have tried make seem intention articles try expose reader subject rational light fashionyet giving some useful formulas relationships ex ample say CL 10 typical models quite true general way effects aspect ratio air foil selection etc can change some what some critics have loudly indicated such criticism must reply am trying take complicated subject put fairly simple terms can digested average reader hope discussion Lift Equation has interest want know about design Questions comments may ad dressed Brad Powers 5470 Castle Hills Dr San Diego CA 92109 RC Scale/Wischers Continued page 45 Light steel parts can brazed 23000 F flame either kind gas heavier metal such l/.in.diameter steel tube landing gears torch suitable use MAPP methyl acetylene pro padiene gas preferred Its flame tempera ture used appropriate torch such Master Mechanic Whirlwind $24 36000 F gas about three times expensive propane s2n3 New Standard Giant Models 28 HP Lbs Send $100 Catalog 149 Direct Sales Only PIns hippsg Work Horse rel7fl 96 IORITZ 2a4 32 HP 6A Lbs III Dealer Direct PIns sblppiq Now Distribute Sachs-Dolmar Engines Yeager Machines TO RUN INCLUDING 6 BOLT PROP HUB AVAILABLE AT EXTRA CHARGE Nm ___ ___ NGINERear 340w Cleveland Isve. SW EU EEECanton OH 44707I IC DIVISIONPhone 216484-6810 48443741 job finished time because intensely hot flame actual cost per joint remains about same /2-in -diameter 035-in -wall aircraft steel tube brought red heat ready brazing bronze rod about ten seconds out red heat steel brazed bronze rod brazing alloy will melt flow uniformly around joint Insufficient heat primary reason lack success brazing Whirlwind torch has pres sure adjustment permits its use propane butane gases lowertemperature brazing maximum joint strength brazing Continued page 142 VXPHONE 6194424838 -h/pates 469-8675 BOX 2498-MALA MESA CA 92041 1 Great Trainers Send $150 complete Kit Catalog p Midwest Products C. Inc 400 S Indiana St PO Box 564-T Hobart 46342 83 t03l February 1984 139 BL ILAP4 MAILABLE IN TWO 1/4 Scale 90 to2EngInes 1 60EngIne EOPWITH TABLOIDI/ASeal77 Span524OOppUSA EOPWlTI4 TABLOID2V —I64 Span$1BOOppUSA 016 TEXAN41101 Span$27tOppUSA POSKEB DRI27 I63 Trip$2SOOppUSA F4U COESAIB2 I93 Span$27tppUSA CUBTISS p402 I94 Span$27OOppUSA FM BEAECAT2 —196 Span$2700 ppUSA Fiberglass COwlingS & Canopies available Send Stamp detailed Brochures oar Giant Scale AccessarreS Forego Orders Please add 254 POstage & Handling Nick Ziroli 29 Edgar Drive Smlthtowfl NY 11787 USA Brazing heavy metals Use Whirlwind Torch L stank stabilized acetylene gas lighter work use Microfiame torch R butane oxidizer cylinders sliver solder C02 ENGINES WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE IAOWNTEL LO A23 PEANUT $2996STANDARD TELCO$2400 CAMPUS BEE $2495TURBO 300092295 CAMPUS TWiN- $5995TURBO 800093900 SODACHARGER $1200 MVIS- COX 02 CONVERSION TO CO2$3900 NEWt C4T4LOG No 25 $150 Classic R/C Scale LAKES TH G4Qr Wing 15 25 Engines Dealers & Distributors Welcomed Phone 703 273-9593 FLYLINE MODELS INC PO Boa 2136 Pairfars VirginIa 22021 USA RC ScalelWischers Continued naae 139 alloys should employed described soft solder flow small space between close-fitting parts Quality bicycle frames assembled method molten brass bronze filling small gap between frame tubes malleable iron fit tings Actually modeling purposes butt joints substantial fillet bronze sufficiently strong Bronze nickel-silver alloy brazing rods have flux coating melts along rod heated Cost about 75 18-in rod will make joints Aircraft 4130 chrome-molybdenum steel tube comes black mill coating must removed emery aluminum oxide cloth before brazing metals need bright best flow bronze Music wire will braze well cleaning except wipe off oil preservative tense heat will affect its temper bit may wise use next larger size joint brought up red heat bronze rod tip introduced flame will melt flow matter few seconds form smooth fillet around joint inexperienced will find joy use After cooling will black glazed residue coating can chipped off lightly tapping small hammer other tool After glass-like glaze removed joint polished strip emery cloth excess bronze can filed off necessary proper quantity bronze applied filing isnt really required Holding parts joined brazing can problem because intense heatflow Unlike soft soldering parts cant held wooden clothespins would char ignite Parts can inserted dry sand metal box hold alignment have also used steel blocks metal work surface primitive fixturing Wear eye protection Hardware stores also have aluminumalloy brazing rods dont require flux melt about 8000 F Cost about 4O 18-in rod Light fabricated alu minum parts models would melt about 12000 F torch using MAPP gas would destroy workpiece best re sults parts use propane butane heat source brazing heavier alu minum sections such engine mounts heat conducted away mass workpiece MAPP gas Whirlwind torch will job Aluminum brazing rod especially serviceable making up spe cial mufflers fit odd spaces Scale model engine cowls Microflame torch handy addition Scale modelers workshop Its 50000 F flame can used brazing welding dont expect heavy work with its largest flame tip Its best use purpose silver soldering small parts brazing rod gold-silver alloy containing cadmium flux core silver alloy requires addition flux gold-silver rods /i2-in dia 6-in long very expensive about $350 arent really intended largequantity applications Silver alloy rods same size less expensive about $1 Microflame torch uses two gas cylin ders containing butane other oxidizer nitrous oxide cylinders small sparklet type both fitted frame control valves palm-size oxide consumed about three times rate butane Cylinders ex pensive about $190 butane $120 oxidizer life short Once cylinders have pierced torch frame wise have enough jobs lined up con sume gas month week later always seem empty due leakage though instruction sheet says will occur fac tor could make cost per joint quite high silver soldering base metal brought up brazing temperature red heat rod applied hot metal will melt flow joint Two different metals can joined provided melting points above 11000 F should no large gaps joint filled melted rod Poor joints will result base metal isnt abso 142 Model Aviation L P0 BOX 3957TORRANCE CA90510 FEA TURES * Fun high speed per formance lands like trainer * Strong balsa con struction * Full scale plans MAGUS LTA mixer included * 3-years design 10 Engine pan flight testing $2695 WePayShipping MI residents add 4% tax Send Certified Check MO Magus Model Aircraft 3518 Laurel Burton Michigan 48529 ATTENTION OP.S Engines & Parts Available Racing Marine Use OPS 15 / Quarter Midget 0 PS 45 Marine PLUS Custom TD 049/051 engine parts Complete inventory stock custom parts COX TD 0491051 engines complete Information send $1 P & G Metal Products 301 North Yale Drive Garland TX 75042 Gene Hempell214 2725210 after 600 PMJ FAI RUBBER Sizes 1/4 3/16 1/8 3/32 1/16 lmmthick042 Boxed 16 oz rubber per box Price $1250 per box ppd USA calif residents add 6% sales tan Coupe de VI lie $2395 plus us Finished prop Very very complete SEND 506 FOR 1984/1985 CATALOG FAJ Model Supply Sunday flying pattern trainer fun fly con tests Youll thrilled flight perform ancel balsa construction See review AprIl 83 RCM issue Engine 40-51 Wing Area 600 sqin Weight S lbs Radio 4 channel SpecIal offer $4994 & $300 shipping CA res odd 6% RICKS KITS POles 1106 Santee CA 920716194493316 lutely clean fingerprints may make joint impossible Only tip brazing rod fed flame puddle molten solder well-fitted joint very little rod required helps reduce cost 50000 F flame held spot base metal hole may burned through Melting points commonly-used metals Steel 25000 brass 18000 bronze 16750 copper 19800 zinc 7870 aluminum 12180 F Mi croflame torch shouldnt used join parts larger about I-in X 2-in x /6-in thick Larger parts will conduct heat away too rapidly fuel suply con sumed before brazing temperature reached bronze brazing rod will fill larger gaps silver solder other welding brazing torches available will much heav ier work employing combinations oxy gen acetylene propane Cost gen erally much higher simpler single-tank systems described arent commonly utilized Scale modelers cause dont need high-strength -quality joints capable producing Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Soaring/Pruss "' ~ oaae 47 back building Sailplanes Hes build ing winches sale plans arent avail able since didnt have built However scribe has parts list youre interested trying Best ShowWinch Divisionat next meet send SASE address end column photo parts list should get way way USA teams backup winch little doodad picture shows aileron doodad clever hinging arrangements could put control surface specifically flaps flaperons ailerons also provides smoothest action cleanest gap line could hope achieve As matter fact no gap See photo TIGER TAIL 4 Ron Chidgeys latest and beat series little larger lighter slower retains honest tlight character tistics ot its predecessors Especially recommended sportsman ad vanced pattern also good choice turn-around pattern Plans construction hints WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile selflocking 3116 width wont cut Vsilicone couplers Pkg 4 clamps $295 deflected aileron notice joint tween wing hinging arrangement Dohle popular highperformance Sailplanes land Porches Leicas current F3B World Champion hinge simpleassuming use aluminum tube leading edge control surface hinge ar rangement shown merely piece wooden dowel covered sec tion Teflon tubing tubing mates ID aluminum tube Only three hinge points necessary short aileron long flaperon Notches filed aluminum tubing allow movement hinge pins depth notches determines amount control surface movement available assembly Teflon-coated pieces fed through aluminum tubing notched locations Small-diameter wood screws screwed dowels slots heads screws cut off shank ends what left threaded ends buried epoxiedin NEW WINGTUBE&SOCKETS 1 dia aluminum alloy tubing plugin wings Included pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $895/set NEW NEW Sleeve Puller $795 BearIng Puller -$695 ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone espanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing *Speclal* Both $1395 See Dealer Order DIrect Include 75 Per Item f UPS Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 example shownin wing course matched concave section has fash ioned affect gapless fit should noted once control surface tached wing attachment per manent Now few words about using alu minum tubing perfect hinge joints Since wings taper both span thickness ailerons flaps usually taper proportion wing stands reason hinge line also tapers thickness since diameter aluminum tubing constant have problem matching perfect concave/ convex joint tubing sticking above airfoil like wart beauty queens nose constant-chord wing would pose no problem As matter fact wing inner panels taper flap installation would snap However tapered-wing problem can resolved few aerodynamic compromises Since has work around problem constant-diameter tube Continued page 146 3-FUNCTION ACCU-TACH ITM O LCD Tachometer w/dual scale capability lox bOX Digital Voltmeter load 1566 checking/cycling TX/RX battery combosACCIbThCJd tor quick arging operation 7fl95 prepaid Send check Nor y order Calif add 6% tax P0 Box 70956 Sunnyvale CA IN94086 ModellerS FREE Z Catalog IFROMI IMicroMark Small Tool Specialists Hundreds unusual lools Iborrowed lmmlIieJewClrfI IGuesmilbing Clock Making protensional Model MakingI trades NOW AVAILABLETO YOU MAIL100% gearaoteedlI IeijI II NAME___________-~~—I nowssI CITY ____________________________________ STATE ICIOMRK4ex 51 t 2 JQ24 East Mole St.Cllntgii NJ aenon J February 1984 143 EVERY DETAIL GREAT SCALE FLiUSI PERFORMS ALL THE MANEUVERS OF lOt IN wINGSPAN 75 Lea USING 56 ENGII JR I COMPLETE KIT LESS WAEEU$22000 SHiF
Edition: Model Aviation - 1984/02
Page Numbers: 44, 45, 135, 138, 139
Radio Control SCALE Bob & Dolly Wischer SOLDERING AND BRAZING Soft sol dering lead-tin alloys common method joining steel brass parts Low joint-strength main disad vantage using ordinary solder Advan tages ease fabrication low tool cost relative ease repairs Joints can re-melted disassembled repair 100-watt soldering iron isnt really iron copper 150-watt solder gun will serve modeling purposes Corrosion oxides enemy soldering process Steel brass parts should cleaned abrasive such steel wool emery cloth sandpaper Most important soft soldered joint have sufficient area contact between metal parts Obviously soldering pair music wire landing gear legs area contact between wires approaches zero Adding solder bulky build-up does very little increase strength Soft solder its best used thin film between close-fitting parts such music wire inside tube tube inside another Melted solder will flow easily capillarity smallest space parts joined well-heated maximum strength crease area contact between mating parts ease flow solder avoid poor joint due oxidation flux applied areas covered solder Pre ferred flux mechanical joints elec trical connections non-corrosive paste such Nokorode Preferred solder greatest strength solid -in diameter wire resin core 50-50 grade equal parts tin lead Grade 60-40 60% lead usable has reduced strength costs less prove solder will wick through small spaces prepare short length music wire one-in-long close-fitting brass tube Coat wire tube interior lightly flux slide tube over wire Heat end tube solder gun resting element tip joint Apply solder joint watch bright melted solder ring appear other end tube using constant application heat Emergence ring indicates maximum-strength joint has formed Fastening two music-wire landing gear wires together solder alone will lead frustration wires need held position mechanical means assure long life joint can readily accomplished binding fine soft iron wire type sold hobby shops arts crafts beadwork wire tin-plated quick wetting molten solder portions music wires wraped 44 Model Aviation Curtiss Robin took 1st place Non-Military Scale Ralph Beck Chicago Expo spans 82 weighs 9 lb uses OS 50 power scratch-built Nieto plans finish silk nitrate dope overcoat epoxy Pollkarpov 1-16 Rats fighter WW II era trophy-winner Joe Spallone Chicago Expo Model 1/6-scale scratch-built all-balsa construction firnish glass cloth/resin Aero Gloss dope over silver epoxy base Robert Nuisingas Fairchild 24R pau wm fuselage modified scale width Its OS 90 drives prop through uu. -rduction belt-drive Wingspan 93 weIght 20 lb Finish K&B Superpoxy over Worid-Tex fabric soldered should roughly parallel greater strength joint partially flattened short length brass tube can sub stitute wraparound place iron wire -in OD tube will flatten en close two /sin-diameter music wires 5A6-in OD tube 5A2-in wires Length tube can little t music wires tube interior flux paste allow plenty time heat penetrate joint Brass tubing can made ductile flattening heating over burner kitchen stove contact red hot element electric stove butane torch will hasten annealing job After cooling air quenching water brass will yield oval shape effort scrap soft sheet brass annealed above required can also used wrap around two music wire legs has ad vantage legs need parallel can meet V shape suggestions intended increase area contact between metal parts joined solder prevent unwanted solder flowing along axle wire make dam punching snug-fitting hole thin cardboard Slipped over wire card board acts solder-stop Brazing techniques Large heavy Scale models need greater strength metal parts can built soft solder Bronze nickel-silver brazing alloys silver solder will provide sturdiness joints torch needed its size type depend upon volume metal heated Ordinary propane butane torches hardware store very inexpensive $5 $10 range including tank gas Continued page 139 An example bronze-rod brazing L sturdy landing gear frame uses 1k-in-diameter steel tube heavy musIc-wire brace tube shaped notching Tuf Grind wheel Moto Tool folding proper angle heavy-duty landing gear loint made soft soldering right An annealed brsss tube flattened fit music wire snuglytechnique Increases contact area solder February 1984 45 Epilogue subject aerodynamics bit complex have tried make seem intention articles try expose reader subject rational light fashionyet giving some useful formulas relationships ex ample say CL 10 typical models quite true general way effects aspect ratio air foil selection etc can change some what some critics have loudly indicated such criticism must reply am trying take complicated subject put fairly simple terms can digested average reader hope discussion Lift Equation has interest want know about design Questions comments may ad dressed Brad Powers 5470 Castle Hills Dr San Diego CA 92109 RC Scale/Wischers Continued page 45 Light steel parts can brazed 23000 F flame either kind gas heavier metal such l/.in.diameter steel tube landing gears torch suitable use MAPP methyl acetylene pro padiene gas preferred Its flame tempera ture used appropriate torch such Master Mechanic Whirlwind $24 36000 F gas about three times expensive propane s2n3 New Standard Giant Models 28 HP Lbs Send $100 Catalog 149 Direct Sales Only PIns hippsg Work Horse rel7fl 96 IORITZ 2a4 32 HP 6A Lbs III Dealer Direct PIns sblppiq Now Distribute Sachs-Dolmar Engines Yeager Machines TO RUN INCLUDING 6 BOLT PROP HUB AVAILABLE AT EXTRA CHARGE Nm ___ ___ NGINERear 340w Cleveland Isve. SW EU EEECanton OH 44707I IC DIVISIONPhone 216484-6810 48443741 job finished time because intensely hot flame actual cost per joint remains about same /2-in -diameter 035-in -wall aircraft steel tube brought red heat ready brazing bronze rod about ten seconds out red heat steel brazed bronze rod brazing alloy will melt flow uniformly around joint Insufficient heat primary reason lack success brazing Whirlwind torch has pres sure adjustment permits its use propane butane gases lowertemperature brazing maximum joint strength brazing Continued page 142 VXPHONE 6194424838 -h/pates 469-8675 BOX 2498-MALA MESA CA 92041 1 Great Trainers Send $150 complete Kit Catalog p Midwest Products C. Inc 400 S Indiana St PO Box 564-T Hobart 46342 83 t03l February 1984 139 BL ILAP4 MAILABLE IN TWO 1/4 Scale 90 to2EngInes 1 60EngIne EOPWITH TABLOIDI/ASeal77 Span524OOppUSA EOPWlTI4 TABLOID2V —I64 Span$1BOOppUSA 016 TEXAN41101 Span$27tOppUSA POSKEB DRI27 I63 Trip$2SOOppUSA F4U COESAIB2 I93 Span$27tppUSA CUBTISS p402 I94 Span$27OOppUSA FM BEAECAT2 —196 Span$2700 ppUSA Fiberglass COwlingS & Canopies available Send Stamp detailed Brochures oar Giant Scale AccessarreS Forego Orders Please add 254 POstage & Handling Nick Ziroli 29 Edgar Drive Smlthtowfl NY 11787 USA Brazing heavy metals Use Whirlwind Torch L stank stabilized acetylene gas lighter work use Microfiame torch R butane oxidizer cylinders sliver solder C02 ENGINES WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE IAOWNTEL LO A23 PEANUT $2996STANDARD TELCO$2400 CAMPUS BEE $2495TURBO 300092295 CAMPUS TWiN- $5995TURBO 800093900 SODACHARGER $1200 MVIS- COX 02 CONVERSION TO CO2$3900 NEWt C4T4LOG No 25 $150 Classic R/C Scale LAKES TH G4Qr Wing 15 25 Engines Dealers & Distributors Welcomed Phone 703 273-9593 FLYLINE MODELS INC PO Boa 2136 Pairfars VirginIa 22021 USA RC ScalelWischers Continued naae 139 alloys should employed described soft solder flow small space between close-fitting parts Quality bicycle frames assembled method molten brass bronze filling small gap between frame tubes malleable iron fit tings Actually modeling purposes butt joints substantial fillet bronze sufficiently strong Bronze nickel-silver alloy brazing rods have flux coating melts along rod heated Cost about 75 18-in rod will make joints Aircraft 4130 chrome-molybdenum steel tube comes black mill coating must removed emery aluminum oxide cloth before brazing metals need bright best flow bronze Music wire will braze well cleaning except wipe off oil preservative tense heat will affect its temper bit may wise use next larger size joint brought up red heat bronze rod tip introduced flame will melt flow matter few seconds form smooth fillet around joint inexperienced will find joy use After cooling will black glazed residue coating can chipped off lightly tapping small hammer other tool After glass-like glaze removed joint polished strip emery cloth excess bronze can filed off necessary proper quantity bronze applied filing isnt really required Holding parts joined brazing can problem because intense heatflow Unlike soft soldering parts cant held wooden clothespins would char ignite Parts can inserted dry sand metal box hold alignment have also used steel blocks metal work surface primitive fixturing Wear eye protection Hardware stores also have aluminumalloy brazing rods dont require flux melt about 8000 F Cost about 4O 18-in rod Light fabricated alu minum parts models would melt about 12000 F torch using MAPP gas would destroy workpiece best re sults parts use propane butane heat source brazing heavier alu minum sections such engine mounts heat conducted away mass workpiece MAPP gas Whirlwind torch will job Aluminum brazing rod especially serviceable making up spe cial mufflers fit odd spaces Scale model engine cowls Microflame torch handy addition Scale modelers workshop Its 50000 F flame can used brazing welding dont expect heavy work with its largest flame tip Its best use purpose silver soldering small parts brazing rod gold-silver alloy containing cadmium flux core silver alloy requires addition flux gold-silver rods /i2-in dia 6-in long very expensive about $350 arent really intended largequantity applications Silver alloy rods same size less expensive about $1 Microflame torch uses two gas cylin ders containing butane other oxidizer nitrous oxide cylinders small sparklet type both fitted frame control valves palm-size oxide consumed about three times rate butane Cylinders ex pensive about $190 butane $120 oxidizer life short Once cylinders have pierced torch frame wise have enough jobs lined up con sume gas month week later always seem empty due leakage though instruction sheet says will occur fac tor could make cost per joint quite high silver soldering base metal brought up brazing temperature red heat rod applied hot metal will melt flow joint Two different metals can joined provided melting points above 11000 F should no large gaps joint filled melted rod Poor joints will result base metal isnt abso 142 Model Aviation L P0 BOX 3957TORRANCE CA90510 FEA TURES * Fun high speed per formance lands like trainer * Strong balsa con struction * Full scale plans MAGUS LTA mixer included * 3-years design 10 Engine pan flight testing $2695 WePayShipping MI residents add 4% tax Send Certified Check MO Magus Model Aircraft 3518 Laurel Burton Michigan 48529 ATTENTION OP.S Engines & Parts Available Racing Marine Use OPS 15 / Quarter Midget 0 PS 45 Marine PLUS Custom TD 049/051 engine parts Complete inventory stock custom parts COX TD 0491051 engines complete Information send $1 P & G Metal Products 301 North Yale Drive Garland TX 75042 Gene Hempell214 2725210 after 600 PMJ FAI RUBBER Sizes 1/4 3/16 1/8 3/32 1/16 lmmthick042 Boxed 16 oz rubber per box Price $1250 per box ppd USA calif residents add 6% sales tan Coupe de VI lie $2395 plus us Finished prop Very very complete SEND 506 FOR 1984/1985 CATALOG FAJ Model Supply Sunday flying pattern trainer fun fly con tests Youll thrilled flight perform ancel balsa construction See review AprIl 83 RCM issue Engine 40-51 Wing Area 600 sqin Weight S lbs Radio 4 channel SpecIal offer $4994 & $300 shipping CA res odd 6% RICKS KITS POles 1106 Santee CA 920716194493316 lutely clean fingerprints may make joint impossible Only tip brazing rod fed flame puddle molten solder well-fitted joint very little rod required helps reduce cost 50000 F flame held spot base metal hole may burned through Melting points commonly-used metals Steel 25000 brass 18000 bronze 16750 copper 19800 zinc 7870 aluminum 12180 F Mi croflame torch shouldnt used join parts larger about I-in X 2-in x /6-in thick Larger parts will conduct heat away too rapidly fuel suply con sumed before brazing temperature reached bronze brazing rod will fill larger gaps silver solder other welding brazing torches available will much heav ier work employing combinations oxy gen acetylene propane Cost gen erally much higher simpler single-tank systems described arent commonly utilized Scale modelers cause dont need high-strength -quality joints capable producing Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Soaring/Pruss "' ~ oaae 47 back building Sailplanes Hes build ing winches sale plans arent avail able since didnt have built However scribe has parts list youre interested trying Best ShowWinch Divisionat next meet send SASE address end column photo parts list should get way way USA teams backup winch little doodad picture shows aileron doodad clever hinging arrangements could put control surface specifically flaps flaperons ailerons also provides smoothest action cleanest gap line could hope achieve As matter fact no gap See photo TIGER TAIL 4 Ron Chidgeys latest and beat series little larger lighter slower retains honest tlight character tistics ot its predecessors Especially recommended sportsman ad vanced pattern also good choice turn-around pattern Plans construction hints WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile selflocking 3116 width wont cut Vsilicone couplers Pkg 4 clamps $295 deflected aileron notice joint tween wing hinging arrangement Dohle popular highperformance Sailplanes land Porches Leicas current F3B World Champion hinge simpleassuming use aluminum tube leading edge control surface hinge ar rangement shown merely piece wooden dowel covered sec tion Teflon tubing tubing mates ID aluminum tube Only three hinge points necessary short aileron long flaperon Notches filed aluminum tubing allow movement hinge pins depth notches determines amount control surface movement available assembly Teflon-coated pieces fed through aluminum tubing notched locations Small-diameter wood screws screwed dowels slots heads screws cut off shank ends what left threaded ends buried epoxiedin NEW WINGTUBE&SOCKETS 1 dia aluminum alloy tubing plugin wings Included pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $895/set NEW NEW Sleeve Puller $795 BearIng Puller -$695 ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone espanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing *Speclal* Both $1395 See Dealer Order DIrect Include 75 Per Item f UPS Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 example shownin wing course matched concave section has fash ioned affect gapless fit should noted once control surface tached wing attachment per manent Now few words about using alu minum tubing perfect hinge joints Since wings taper both span thickness ailerons flaps usually taper proportion wing stands reason hinge line also tapers thickness since diameter aluminum tubing constant have problem matching perfect concave/ convex joint tubing sticking above airfoil like wart beauty queens nose constant-chord wing would pose no problem As matter fact wing inner panels taper flap installation would snap However tapered-wing problem can resolved few aerodynamic compromises Since has work around problem constant-diameter tube Continued page 146 3-FUNCTION ACCU-TACH ITM O LCD Tachometer w/dual scale capability lox bOX Digital Voltmeter load 1566 checking/cycling TX/RX battery combosACCIbThCJd tor quick arging operation 7fl95 prepaid Send check Nor y order Calif add 6% tax P0 Box 70956 Sunnyvale CA IN94086 ModellerS FREE Z Catalog IFROMI IMicroMark Small Tool Specialists Hundreds unusual lools Iborrowed lmmlIieJewClrfI IGuesmilbing Clock Making protensional Model MakingI trades NOW AVAILABLETO YOU MAIL100% gearaoteedlI IeijI II NAME___________-~~—I nowssI CITY ____________________________________ STATE ICIOMRK4ex 51 t 2 JQ24 East Mole St.Cllntgii NJ aenon J February 1984 143 EVERY DETAIL GREAT SCALE FLiUSI PERFORMS ALL THE MANEUVERS OF lOt IN wINGSPAN 75 Lea USING 56 ENGII JR I COMPLETE KIT LESS WAEEU$22000 SHiF
Edition: Model Aviation - 1984/02
Page Numbers: 44, 45, 135, 138, 139
Radio Control SCALE Bob & Dolly Wischer SOLDERING AND BRAZING Soft sol dering lead-tin alloys common method joining steel brass parts Low joint-strength main disad vantage using ordinary solder Advan tages ease fabrication low tool cost relative ease repairs Joints can re-melted disassembled repair 100-watt soldering iron isnt really iron copper 150-watt solder gun will serve modeling purposes Corrosion oxides enemy soldering process Steel brass parts should cleaned abrasive such steel wool emery cloth sandpaper Most important soft soldered joint have sufficient area contact between metal parts Obviously soldering pair music wire landing gear legs area contact between wires approaches zero Adding solder bulky build-up does very little increase strength Soft solder its best used thin film between close-fitting parts such music wire inside tube tube inside another Melted solder will flow easily capillarity smallest space parts joined well-heated maximum strength crease area contact between mating parts ease flow solder avoid poor joint due oxidation flux applied areas covered solder Pre ferred flux mechanical joints elec trical connections non-corrosive paste such Nokorode Preferred solder greatest strength solid -in diameter wire resin core 50-50 grade equal parts tin lead Grade 60-40 60% lead usable has reduced strength costs less prove solder will wick through small spaces prepare short length music wire one-in-long close-fitting brass tube Coat wire tube interior lightly flux slide tube over wire Heat end tube solder gun resting element tip joint Apply solder joint watch bright melted solder ring appear other end tube using constant application heat Emergence ring indicates maximum-strength joint has formed Fastening two music-wire landing gear wires together solder alone will lead frustration wires need held position mechanical means assure long life joint can readily accomplished binding fine soft iron wire type sold hobby shops arts crafts beadwork wire tin-plated quick wetting molten solder portions music wires wraped 44 Model Aviation Curtiss Robin took 1st place Non-Military Scale Ralph Beck Chicago Expo spans 82 weighs 9 lb uses OS 50 power scratch-built Nieto plans finish silk nitrate dope overcoat epoxy Pollkarpov 1-16 Rats fighter WW II era trophy-winner Joe Spallone Chicago Expo Model 1/6-scale scratch-built all-balsa construction firnish glass cloth/resin Aero Gloss dope over silver epoxy base Robert Nuisingas Fairchild 24R pau wm fuselage modified scale width Its OS 90 drives prop through uu. -rduction belt-drive Wingspan 93 weIght 20 lb Finish K&B Superpoxy over Worid-Tex fabric soldered should roughly parallel greater strength joint partially flattened short length brass tube can sub stitute wraparound place iron wire -in OD tube will flatten en close two /sin-diameter music wires 5A6-in OD tube 5A2-in wires Length tube can little t music wires tube interior flux paste allow plenty time heat penetrate joint Brass tubing can made ductile flattening heating over burner kitchen stove contact red hot element electric stove butane torch will hasten annealing job After cooling air quenching water brass will yield oval shape effort scrap soft sheet brass annealed above required can also used wrap around two music wire legs has ad vantage legs need parallel can meet V shape suggestions intended increase area contact between metal parts joined solder prevent unwanted solder flowing along axle wire make dam punching snug-fitting hole thin cardboard Slipped over wire card board acts solder-stop Brazing techniques Large heavy Scale models need greater strength metal parts can built soft solder Bronze nickel-silver brazing alloys silver solder will provide sturdiness joints torch needed its size type depend upon volume metal heated Ordinary propane butane torches hardware store very inexpensive $5 $10 range including tank gas Continued page 139 An example bronze-rod brazing L sturdy landing gear frame uses 1k-in-diameter steel tube heavy musIc-wire brace tube shaped notching Tuf Grind wheel Moto Tool folding proper angle heavy-duty landing gear loint made soft soldering right An annealed brsss tube flattened fit music wire snuglytechnique Increases contact area solder February 1984 45 Epilogue subject aerodynamics bit complex have tried make seem intention articles try expose reader subject rational light fashionyet giving some useful formulas relationships ex ample say CL 10 typical models quite true general way effects aspect ratio air foil selection etc can change some what some critics have loudly indicated such criticism must reply am trying take complicated subject put fairly simple terms can digested average reader hope discussion Lift Equation has interest want know about design Questions comments may ad dressed Brad Powers 5470 Castle Hills Dr San Diego CA 92109 RC Scale/Wischers Continued page 45 Light steel parts can brazed 23000 F flame either kind gas heavier metal such l/.in.diameter steel tube landing gears torch suitable use MAPP methyl acetylene pro padiene gas preferred Its flame tempera ture used appropriate torch such Master Mechanic Whirlwind $24 36000 F gas about three times expensive propane s2n3 New Standard Giant Models 28 HP Lbs Send $100 Catalog 149 Direct Sales Only PIns hippsg Work Horse rel7fl 96 IORITZ 2a4 32 HP 6A Lbs III Dealer Direct PIns sblppiq Now Distribute Sachs-Dolmar Engines Yeager Machines TO RUN INCLUDING 6 BOLT PROP HUB AVAILABLE AT EXTRA CHARGE Nm ___ ___ NGINERear 340w Cleveland Isve. SW EU EEECanton OH 44707I IC DIVISIONPhone 216484-6810 48443741 job finished time because intensely hot flame actual cost per joint remains about same /2-in -diameter 035-in -wall aircraft steel tube brought red heat ready brazing bronze rod about ten seconds out red heat steel brazed bronze rod brazing alloy will melt flow uniformly around joint Insufficient heat primary reason lack success brazing Whirlwind torch has pres sure adjustment permits its use propane butane gases lowertemperature brazing maximum joint strength brazing Continued page 142 VXPHONE 6194424838 -h/pates 469-8675 BOX 2498-MALA MESA CA 92041 1 Great Trainers Send $150 complete Kit Catalog p Midwest Products C. Inc 400 S Indiana St PO Box 564-T Hobart 46342 83 t03l February 1984 139 BL ILAP4 MAILABLE IN TWO 1/4 Scale 90 to2EngInes 1 60EngIne EOPWITH TABLOIDI/ASeal77 Span524OOppUSA EOPWlTI4 TABLOID2V —I64 Span$1BOOppUSA 016 TEXAN41101 Span$27tOppUSA POSKEB DRI27 I63 Trip$2SOOppUSA F4U COESAIB2 I93 Span$27tppUSA CUBTISS p402 I94 Span$27OOppUSA FM BEAECAT2 —196 Span$2700 ppUSA Fiberglass COwlingS & Canopies available Send Stamp detailed Brochures oar Giant Scale AccessarreS Forego Orders Please add 254 POstage & Handling Nick Ziroli 29 Edgar Drive Smlthtowfl NY 11787 USA Brazing heavy metals Use Whirlwind Torch L stank stabilized acetylene gas lighter work use Microfiame torch R butane oxidizer cylinders sliver solder C02 ENGINES WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE IAOWNTEL LO A23 PEANUT $2996STANDARD TELCO$2400 CAMPUS BEE $2495TURBO 300092295 CAMPUS TWiN- $5995TURBO 800093900 SODACHARGER $1200 MVIS- COX 02 CONVERSION TO CO2$3900 NEWt C4T4LOG No 25 $150 Classic R/C Scale LAKES TH G4Qr Wing 15 25 Engines Dealers & Distributors Welcomed Phone 703 273-9593 FLYLINE MODELS INC PO Boa 2136 Pairfars VirginIa 22021 USA RC ScalelWischers Continued naae 139 alloys should employed described soft solder flow small space between close-fitting parts Quality bicycle frames assembled method molten brass bronze filling small gap between frame tubes malleable iron fit tings Actually modeling purposes butt joints substantial fillet bronze sufficiently strong Bronze nickel-silver alloy brazing rods have flux coating melts along rod heated Cost about 75 18-in rod will make joints Aircraft 4130 chrome-molybdenum steel tube comes black mill coating must removed emery aluminum oxide cloth before brazing metals need bright best flow bronze Music wire will braze well cleaning except wipe off oil preservative tense heat will affect its temper bit may wise use next larger size joint brought up red heat bronze rod tip introduced flame will melt flow matter few seconds form smooth fillet around joint inexperienced will find joy use After cooling will black glazed residue coating can chipped off lightly tapping small hammer other tool After glass-like glaze removed joint polished strip emery cloth excess bronze can filed off necessary proper quantity bronze applied filing isnt really required Holding parts joined brazing can problem because intense heatflow Unlike soft soldering parts cant held wooden clothespins would char ignite Parts can inserted dry sand metal box hold alignment have also used steel blocks metal work surface primitive fixturing Wear eye protection Hardware stores also have aluminumalloy brazing rods dont require flux melt about 8000 F Cost about 4O 18-in rod Light fabricated alu minum parts models would melt about 12000 F torch using MAPP gas would destroy workpiece best re sults parts use propane butane heat source brazing heavier alu minum sections such engine mounts heat conducted away mass workpiece MAPP gas Whirlwind torch will job Aluminum brazing rod especially serviceable making up spe cial mufflers fit odd spaces Scale model engine cowls Microflame torch handy addition Scale modelers workshop Its 50000 F flame can used brazing welding dont expect heavy work with its largest flame tip Its best use purpose silver soldering small parts brazing rod gold-silver alloy containing cadmium flux core silver alloy requires addition flux gold-silver rods /i2-in dia 6-in long very expensive about $350 arent really intended largequantity applications Silver alloy rods same size less expensive about $1 Microflame torch uses two gas cylin ders containing butane other oxidizer nitrous oxide cylinders small sparklet type both fitted frame control valves palm-size oxide consumed about three times rate butane Cylinders ex pensive about $190 butane $120 oxidizer life short Once cylinders have pierced torch frame wise have enough jobs lined up con sume gas month week later always seem empty due leakage though instruction sheet says will occur fac tor could make cost per joint quite high silver soldering base metal brought up brazing temperature red heat rod applied hot metal will melt flow joint Two different metals can joined provided melting points above 11000 F should no large gaps joint filled melted rod Poor joints will result base metal isnt abso 142 Model Aviation L P0 BOX 3957TORRANCE CA90510 FEA TURES * Fun high speed per formance lands like trainer * Strong balsa con struction * Full scale plans MAGUS LTA mixer included * 3-years design 10 Engine pan flight testing $2695 WePayShipping MI residents add 4% tax Send Certified Check MO Magus Model Aircraft 3518 Laurel Burton Michigan 48529 ATTENTION OP.S Engines & Parts Available Racing Marine Use OPS 15 / Quarter Midget 0 PS 45 Marine PLUS Custom TD 049/051 engine parts Complete inventory stock custom parts COX TD 0491051 engines complete Information send $1 P & G Metal Products 301 North Yale Drive Garland TX 75042 Gene Hempell214 2725210 after 600 PMJ FAI RUBBER Sizes 1/4 3/16 1/8 3/32 1/16 lmmthick042 Boxed 16 oz rubber per box Price $1250 per box ppd USA calif residents add 6% sales tan Coupe de VI lie $2395 plus us Finished prop Very very complete SEND 506 FOR 1984/1985 CATALOG FAJ Model Supply Sunday flying pattern trainer fun fly con tests Youll thrilled flight perform ancel balsa construction See review AprIl 83 RCM issue Engine 40-51 Wing Area 600 sqin Weight S lbs Radio 4 channel SpecIal offer $4994 & $300 shipping CA res odd 6% RICKS KITS POles 1106 Santee CA 920716194493316 lutely clean fingerprints may make joint impossible Only tip brazing rod fed flame puddle molten solder well-fitted joint very little rod required helps reduce cost 50000 F flame held spot base metal hole may burned through Melting points commonly-used metals Steel 25000 brass 18000 bronze 16750 copper 19800 zinc 7870 aluminum 12180 F Mi croflame torch shouldnt used join parts larger about I-in X 2-in x /6-in thick Larger parts will conduct heat away too rapidly fuel suply con sumed before brazing temperature reached bronze brazing rod will fill larger gaps silver solder other welding brazing torches available will much heav ier work employing combinations oxy gen acetylene propane Cost gen erally much higher simpler single-tank systems described arent commonly utilized Scale modelers cause dont need high-strength -quality joints capable producing Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Soaring/Pruss "' ~ oaae 47 back building Sailplanes Hes build ing winches sale plans arent avail able since didnt have built However scribe has parts list youre interested trying Best ShowWinch Divisionat next meet send SASE address end column photo parts list should get way way USA teams backup winch little doodad picture shows aileron doodad clever hinging arrangements could put control surface specifically flaps flaperons ailerons also provides smoothest action cleanest gap line could hope achieve As matter fact no gap See photo TIGER TAIL 4 Ron Chidgeys latest and beat series little larger lighter slower retains honest tlight character tistics ot its predecessors Especially recommended sportsman ad vanced pattern also good choice turn-around pattern Plans construction hints WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile selflocking 3116 width wont cut Vsilicone couplers Pkg 4 clamps $295 deflected aileron notice joint tween wing hinging arrangement Dohle popular highperformance Sailplanes land Porches Leicas current F3B World Champion hinge simpleassuming use aluminum tube leading edge control surface hinge ar rangement shown merely piece wooden dowel covered sec tion Teflon tubing tubing mates ID aluminum tube Only three hinge points necessary short aileron long flaperon Notches filed aluminum tubing allow movement hinge pins depth notches determines amount control surface movement available assembly Teflon-coated pieces fed through aluminum tubing notched locations Small-diameter wood screws screwed dowels slots heads screws cut off shank ends what left threaded ends buried epoxiedin NEW WINGTUBE&SOCKETS 1 dia aluminum alloy tubing plugin wings Included pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $895/set NEW NEW Sleeve Puller $795 BearIng Puller -$695 ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone espanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing *Speclal* Both $1395 See Dealer Order DIrect Include 75 Per Item f UPS Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 example shownin wing course matched concave section has fash ioned affect gapless fit should noted once control surface tached wing attachment per manent Now few words about using alu minum tubing perfect hinge joints Since wings taper both span thickness ailerons flaps usually taper proportion wing stands reason hinge line also tapers thickness since diameter aluminum tubing constant have problem matching perfect concave/ convex joint tubing sticking above airfoil like wart beauty queens nose constant-chord wing would pose no problem As matter fact wing inner panels taper flap installation would snap However tapered-wing problem can resolved few aerodynamic compromises Since has work around problem constant-diameter tube Continued page 146 3-FUNCTION ACCU-TACH ITM O LCD Tachometer w/dual scale capability lox bOX Digital Voltmeter load 1566 checking/cycling TX/RX battery combosACCIbThCJd tor quick arging operation 7fl95 prepaid Send check Nor y order Calif add 6% tax P0 Box 70956 Sunnyvale CA IN94086 ModellerS FREE Z Catalog IFROMI IMicroMark Small Tool Specialists Hundreds unusual lools Iborrowed lmmlIieJewClrfI IGuesmilbing Clock Making protensional Model MakingI trades NOW AVAILABLETO YOU MAIL100% gearaoteedlI IeijI II NAME___________-~~—I nowssI CITY ____________________________________ STATE ICIOMRK4ex 51 t 2 JQ24 East Mole St.Cllntgii NJ aenon J February 1984 143 EVERY DETAIL GREAT SCALE FLiUSI PERFORMS ALL THE MANEUVERS OF lOt IN wINGSPAN 75 Lea USING 56 ENGII JR I COMPLETE KIT LESS WAEEU$22000 SHiF