Profile Ju-635

PROtIL JU635 THE ONE THING German engineers earlier years aviation never seemed have worry about orthodoxy has thumb through book German warplanes see what mean have tried almost configuration type construction known man kind Just sold strange designs War Department beyond odd eccentric World War II designs built flown Some made production Junker Ju-635 however quite lucky shared number design concepts similar planes being explored built Ju-635 victim unfavorable timing end WW II arrived before construction can great fun take design whatever reason never got past sketches conceptualization bring rest way real ity Such case file Scale designed 049s promodel two EGene Nelson 68 Model Aviation Top Fast what full-size design says cannot have four engines packaged like siow long thin fuselages add look speed Above ample wing area small twin centersection wing sheeted additional strength elevator joiner wire shows up well too adds strength reducing vibration Full-Size Plans Available. See Page 188 HINGE LOCATIONS NOTE__ GRAIN PLO BO 1 74 FILLW-HA-HW-TA-S0-5-L4 PLO LG GIHEOHOL FORMED TE NOT Qff HON 716 PLY SOISLER III -5' - -hLtY - SEW NOSE GEARS TO PLO DOUNLER I-IO6OIA 71- --rrL IA 280 N -4--IL JII 2 I/IA MWFLAT CENTER SECTOR PMOP -J prototype could begin design never got off drawing board Prominent among design concepts Ju-635 shared other war planes period taking two aircraft joining together common center wing called zwilling twin configuration famous plane using zwilling Hem kel He-i liztwo He-ill bombers joined new center-wing section making addition fifth engine new airplane capable towing mammoth troop gliders Other zwilling designs tried varying success Messerschmitt built Bf 109z two fighters wasnt com pleted until closing days war destroyed before got chance fly over America idea popular Although North American F-82 thought combination two Mustangs actually appeared zwilling design F-82 fact new airframe designed utilize benefits zwilling layout Ju-635 other hand did make authentic use zwilling conceptbut did great originality aircraft chosen mating form in-line engine configuration radical Dornier 335 fighter largest fighter its day operational inline push-pull twin-engined fighter ever built chock-full unusual things like ejector seats tricycle landing gear heavy armament capabilities Having avid Luftwaffe fan years surprised see Ju 635 drawing Kenneth Munsons book German War Birdr Ive researched built almost everything Germans built during WW II Y72-scale plastic yet never seen Ju-635 mentioned quickly bought book started en larging comparing design drawings file Domier 335 appears design utilized extended fuselage standard-model tail configura Left view down centerline shows engine offset cleariy Both engines have out-thrust bu ut mounts keep modei out end iines beiongs Right Having both engines outboard side improves both iooks weight distribution October 1987 69 1ZIiIZL HESS*Z2REOOAT-S RESt 0-5 W-BA-S MARE 2 EACH OF WY TO A-H ALL RIBS FROM SS2 REFERENCE- GERMAN RAM SIMON I/A HUGGERI/4 SO SPARyIN SASETING OFF-SET TOPTOP Left landing gear doors extra work look great finished landing gear wings moved back plans improve its strength ground handling Right Because dihedral lead-outs need exit wing early Epoxythetubes place Left elevator connecting wire sewn elevator hinge iine xo ensure smooth free movement rear props freewheeling anchored fuselage blind nuts Right Dont leave freewheeling props offthey add lot charm tion Dornier 335 wings center section straight chord signifi cantly wider standard wing root pieced side-view together came up model presented prob ably 100% accurate best could little information Perhaps model will stir up some lost information As model wanted something would catch essence Ju-635 never got its chance fly long narrow fuselages four-legged gear make very distinctive air Try might could find way power propellers shaft extensions would have made project overwhelming elec ted go freewheeling rear props does look neat air think future Im going add drop tanks fun Construction quite simple straight forward just few areas need considered first though cause model has such long nose tail moment arms important keep thing aligned two fuselages need parallel both side plan views mind designed model key together Notice slots built wing fit fuselages suggest wing pinned down large flat area final assembly fuselages set place aligned carefully before gluing models have build two almost everything Begin cutting out four rudders two elevators two stabilizers Join elevators /16 music wire joiners set aside dry rudders can sanded offsets cut glued Make sure point right way Hinge stabilizers elevators sand edges round Select two straight firm sheets 3 x h-in balsa fuselages Cut out side view per plans cut out underscoop well glue scoop until after final assembly ensuring model will set flat bench alignment firewalls can cut out well plywood nose doublers engine mount blocks Bend nose gear wires shape sew plywood doublers heavy thread Carefully glue doublers engine mount blocks firewalls place keeping align ment Wing fuselages drying cut out wing parts Begin outboard wing panels Pin leading trailing edges place glue ribs wing tip cyanoacrylate CyA glue As soon glue sets unpin panel turn over Lay sheet wax paper bottom wing pin leading trailing edges other wing panel bottom finished panel Glue ribs tip unpin panels bingo have two opposite wing panels Cut out pin down center section parts Make sure outer wing panels fit snugly place Block up outer panels dihedral shown plans glue wing together Keep fuselage slots wing open i fuselage check make sure slots parallel Add top spar bellcrank mount planking Once wing has cured sand required trial fit fuselages place Continued page 162 70 Model Aviation SAFETY NEEDLE REMOTE NEEDLE VALVE ADJUSTER KEEPS YOUR FINGERS SAFE DISTANCE FROM THE PROP ALLOWS PERFECT NEEDLE ADJUSTMENT FOR EVERY FLIGHT PRECISION GEAR TRAIN MAKES IT EASY TO SET ENGINE FOR PEAK POWER LO1 CONTROL ALLOWS DESIRED DRAG ON ADJUSTER KNOB FROM LOOSE TO LOCKED COMPLETE WITH MOUNTING HARDWARE S ADAPTERS FOR BENT OR KNOB TYPE NEEDLES FOR 19-108 ENGINES PRICE 512QO 550 MODEL PRODUCTS POST PAID PD BOX 4026 601 LEE ST CHECK OR MD DES PLAINES IL 60016 CL Navy Carrier Continued page 156 parts about option steel slide drill press helpful hand drill will suffice method construction obvious photographs dimensions various parts depend upon dimensions exhaust stack assembly will attached Size shape critical opening slide should tapered slide used conjunction intake throttle used primarily fuel metering described August column length taper may have adjusted provide optimum performance fuel mixture correct idle full throttle engine goes excessively rich throttle advanced slowly idle taper should shorter open faster engine lean slightly above idle taper should longer exhaust opening will increase slowly slide moved Adjustments can also made amount throttle arm movement relation exhaust slide movement Some experimentation will probably required before optimum setup achieved example shown mounted using 4-40 flat-head screws slide tracks attached base 2-56 screws although smaller ones will work just well best method maintain straight smooth edge brass slide tracks use finished edge strip interior side track cutting base wider finished dimension using -in-wide brass strip track parts outside edges slide unit can cut final size after assembly complete tested smooth operation cutting outside edges same operation smooth edge can produced minimum work On-Off pressure advent throttles contain own fuel metering has greatly simplified engine speed control use exhaust restrictors conjunction metering HOBBY __ outdated old discard older basic RC systems can easily update adding dual rates mixing extra channels frequency changes etc need basic electrical ability simple tools Written R/C tech 10 yrs exp 142 page journal includes sources diagrams charts detailed modifications written simple under standable text Send $1995 check money order SOBBY RADIO 3001-A Kavanaugh Rd Wilson NC 27893 Phone 919 291-8548 Hobby Radio also offers professional R/C repairs mods Complete systems service battery pack servos vibration testing new frequency change etc manu facturer repairs guaranteed performed minimal turnaround Send sase price list complete services carburetor can allow quite reliable engine speed control pressure fuel systems described August column An alternative system exists although little harder construct offers extreme ease adjustment system refer switched pressure/suction system type system operates pressure high speed switches suction low speed low speed intake throttle fixed engine speed controlled solely exhaust restrsctor Kavan pressure carburetor provides easiest method installing switched pressure suction system contains valve releases pressure fuel tank throttle closed have seen lately very expensive current-produc tion items have never great supply photo shows Kavan carb overcenter spring used hold carb both open closed positions carb opened manually before engine started closed small-diameter cable throttle closed first time very flexible cable allows free movement exhaust restrictor movement intake throttle alternative Kavan pressure carb Any carb fuel meter can used release pressure fuel tank simple device shown photographs works well wire Yes-in diameter can same wire operates intake throttle housing pinches vent line cap Bic pen protective covers needles some hypodermic syringes will also work well little harder find large brass eyelet could also substituted tubing would have replaced often Surgical tubing used tanks vent line During high-speed flight tubing pinched inside housing sealing tube very effec tively thereby trapping pressure inside fuel tank wire loop moved out housing surgical tubing straightens out allows pressure escape fuel tank vent line must placed upper inside forward portion tank prevent fuel being forced out vent line set up speed control open exhaust restrictor intake throttle tank vent closed set needle valve best highspeed performance Minor changes highspeed setting should have little effect lowspeed adjustments Next close intake throttle tank vent open leave exhaust restrictor fully open Set idle speed adjustment stop carb opening engine speed maximum anticipate needing during low-speed flight prob ably 12000 15000 rpm Set idle mixture adjustment produce slightly rich run exhaust restrictor open Close exhaust restric br gradually until desired low speed achieved adjust linkage slide will stop point bellcrank full low-speed position Throttle response should smooth rapid should independent rate throttle opened have found systems such very tolerant changes fuel altitude weather few changes required idle mixture once initial settings satisfactory having difficulty current pressure-throttle arrangement con sider switched pressure/suction system may pleasantly surprised Richard L Perry 10035 Deadwood Ave Ellsworth AFB SD 57706 JU-635/Netson Continued page 70 Give wing few coats dope sand off fuzz Cover medium-to-heavy silkspan shrink water dry apply two three coats thinned dope wing fuselage tail semblies Sand fit rudders top fuselages nowthe lower rudders will added later Place wing flat surface align glue fuselages wing getting parallel possible other Fit stabilizer assemblies place Line up above rear make sure level hinge lines straight Continued page 168 162 Model Aviation CA MASK CA glue works wonders building models right Unfortunately gives off enough fumes knock vulture off carcass modelers have suffered medical problems after inhaling CA fumes take chances special vapor respirator filters CA fumes soft face mask adjustable straps comfortably fits face sizes easy breathing valve allows prolonged use providing dependable filtering concentrations up 1000 PPM though rugged industrial mask light weight elimi nate fatigue Dont get gassed CA Get protected Order CA Mask today Just $1247 shipping cheaper hospital visit Money order Master Charge Visa include expiration date check allow 20 days clearl Sorry no CODs Pelican Enterprises Inc 265 OXFORD LANE BLOOMINGOALE ILLINOIS 60108 F S Send catalog modelers safety supplies other Glue place bend up /16-rn music wire elevator joiner Use CyA tack place carefully sew elevators shown plans Check fuselages make sure still parallel finish gluing wire joiner place setting cut out plywood landing gear doors give few coats dope seal off Bend main landing gear wires shape sew gear doors wire shown Now add lower scoops nose gear doors main landing gears lower rudders fuselages Finishing chose paint model common Luftwaffe splinter pattern light blue undersides dark green/black green upper surfaces canopies painted black outlined silver pin-stripping tape crosses cut black white MonoKote trim sheets stuck place Install engines wheels rear props Add drop CyA glue rear prop screws keep coming off flight should little trouble balancing Ju-6 35 check just same Add needed weight Twins lot fun fly much fun sit monkey field Test run engines before go out fly should start run well individually together Try tuning same pitch timing runs longer running two engines should put inboard fuselage Once satisfied performance get some 30-ft steel lines head field Warm up engines set needle valves harmony Shut engines down refuel hook up lines Ju 635 rolls out rather awkwardly its four wheels picks up speed quickly will break ground touch elevator air very stable maneuverable engine settles down slow steady flight pattern yet still responsive Have fun reliving past never got happen FF Old-Timers/Haught Continued page 71 engine started booster batteriesonly have quit switched over flight batteries Today larger models use alkaline C D batteries flight pack start engine booster batteries bench-running still prefer use boosters made hooking two *6 dry cells series provide required three volts use boosters small models equipped AA flight batteries Incidentally polarity ignition system optional care must used using booster batteries reversing polarity will ruin flight pack Ignition engines run slower glow counterparts generally require propeller has larger diameter lower pitch As rule thumb usually use nine-inch-diameter prop small engines up 19 cu displace ment 10-in small Class B up 25 cu li-in 29s 14-in 60s Pitch neighborhood four six inches like use largest propeller will still allow engine attaln its original rated rpm Fuel ignition engine must mixed Although ignition engines will run fine glow fuel SAM competition rules require gas-andoil mixture originally recommended formula three four parts white gasoline part SAE 70 motor oil Motorcycle oil used call RMcM White gasoline no longer available local service station unleaded auto gas welcome substitute oil now problem SAE 70 oil used available motorcycle shops scarce now use Aviation SAE 60 uncompounded oil local airport mix three-to-one unleaded gasoline seems work fine Some suppliers offer mixed fuel oil other lubrication additives have no current information whats available Perhaps some out can help out Before attempting start ignition engine other caution worth mentioning old engines designed used electric starters Electric starters place reverse thrust load crankshaft may push back crankcase far enough rotating crankpin chew up rear engine casting best using electric starter places undue strain crankshaft bushings meet rear prop drive washer Newly converted glow engines may handle starters just fine unless original replica engine has ball thrust bearing will better off hand-cranking engine obtain maximum power ignition must occur near top dead center pistons strokeand preferably just before piston reaches top dead center allow fuel/air mixture begin burning before piston starts down thereby assuring maximum energy will utilized Trying start engine spark timed occur top dead center can result backfiring kicking engine turn can whack good finger avoid situation engine cranked spark-timing retarded Simply move adjust able timer-arm direction propeller rotation few degrees ignition will occur Continued page 170 168 Model Aviation RC SOARING DIGEST monthly publication covering International RC Soaring Scene SI 6/yearin USA US $20/yr Canada& Mexico US $24/yr elsewhere via airmail RCSD PO Box 269 Peterborough NH 03458 hate install hinges Try Easy Hinges See Difference single slot few drops CIA glue Its done No gouging pinning hinge pins worry about Incredibly strong Virtually indestructible 24 hinges 0295 P0 Box 1743 Marcos CA 92069 WETPOXY SAFE OXY unique two-component epoxy laminating system developed offer user safest highest quality laminating resin available VA Pt Kit- $1400 VA Ot Kit- $2100 Glass Cloth 58 oz/sq yd 38x6ft-$90038xl5ft-$1900 38x30ft-$3500 add $250 Ship & Hand above inems Send SASE additional information AcPs Ughtweight comsite Materials Order COD Send check Money Order AEROSPACE COMPOSITE PRODUCTS P0 Boa 16621 IDept Al Irvine CA 92714 Source tor Lightweight Materials JU-635/Nelson Continued page 162 Fokker D-VII VK Model Aircraft PO Box 3007 Aurora 1160505 312-357-1883

PROtIL JU635 THE ONE THING German engineers earlier years aviation never seemed have worry about orthodoxy has thumb through book German warplanes see what mean have tried almost configuration type construction known man kind Just sold strange designs War Department beyond odd eccentric World War II designs built flown Some made production Junker Ju-635 however quite lucky shared number design concepts similar planes being explored built Ju-635 victim unfavorable timing end WW II arrived before construction can great fun take design whatever reason never got past sketches conceptualization bring rest way real ity Such case file Scale designed 049s promodel two EGene Nelson 68 Model Aviation Top Fast what full-size design says cannot have four engines packaged like siow long thin fuselages add look speed Above ample wing area small twin centersection wing sheeted additional strength elevator joiner wire shows up well too adds strength reducing vibration Full-Size Plans Available. See Page 188 HINGE LOCATIONS NOTE__ GRAIN PLO BO 1 74 FILLW-HA-HW-TA-S0-5-L4 PLO LG GIHEOHOL FORMED TE NOT Qff HON 716 PLY SOISLER III -5' - -hLtY - SEW NOSE GEARS TO PLO DOUNLER I-IO6OIA 71- --rrL IA 280 N -4--IL JII 2 I/IA MWFLAT CENTER SECTOR PMOP -J prototype could begin design never got off drawing board Prominent among design concepts Ju-635 shared other war planes period taking two aircraft joining together common center wing called zwilling twin configuration famous plane using zwilling Hem kel He-i liztwo He-ill bombers joined new center-wing section making addition fifth engine new airplane capable towing mammoth troop gliders Other zwilling designs tried varying success Messerschmitt built Bf 109z two fighters wasnt com pleted until closing days war destroyed before got chance fly over America idea popular Although North American F-82 thought combination two Mustangs actually appeared zwilling design F-82 fact new airframe designed utilize benefits zwilling layout Ju-635 other hand did make authentic use zwilling conceptbut did great originality aircraft chosen mating form in-line engine configuration radical Dornier 335 fighter largest fighter its day operational inline push-pull twin-engined fighter ever built chock-full unusual things like ejector seats tricycle landing gear heavy armament capabilities Having avid Luftwaffe fan years surprised see Ju 635 drawing Kenneth Munsons book German War Birdr Ive researched built almost everything Germans built during WW II Y72-scale plastic yet never seen Ju-635 mentioned quickly bought book started en larging comparing design drawings file Domier 335 appears design utilized extended fuselage standard-model tail configura Left view down centerline shows engine offset cleariy Both engines have out-thrust bu ut mounts keep modei out end iines beiongs Right Having both engines outboard side improves both iooks weight distribution October 1987 69 1ZIiIZL HESS*Z2REOOAT-S RESt 0-5 W-BA-S MARE 2 EACH OF WY TO A-H ALL RIBS FROM SS2 REFERENCE- GERMAN RAM SIMON I/A HUGGERI/4 SO SPARyIN SASETING OFF-SET TOPTOP Left landing gear doors extra work look great finished landing gear wings moved back plans improve its strength ground handling Right Because dihedral lead-outs need exit wing early Epoxythetubes place Left elevator connecting wire sewn elevator hinge iine xo ensure smooth free movement rear props freewheeling anchored fuselage blind nuts Right Dont leave freewheeling props offthey add lot charm tion Dornier 335 wings center section straight chord signifi cantly wider standard wing root pieced side-view together came up model presented prob ably 100% accurate best could little information Perhaps model will stir up some lost information As model wanted something would catch essence Ju-635 never got its chance fly long narrow fuselages four-legged gear make very distinctive air Try might could find way power propellers shaft extensions would have made project overwhelming elec ted go freewheeling rear props does look neat air think future Im going add drop tanks fun Construction quite simple straight forward just few areas need considered first though cause model has such long nose tail moment arms important keep thing aligned two fuselages need parallel both side plan views mind designed model key together Notice slots built wing fit fuselages suggest wing pinned down large flat area final assembly fuselages set place aligned carefully before gluing models have build two almost everything Begin cutting out four rudders two elevators two stabilizers Join elevators /16 music wire joiners set aside dry rudders can sanded offsets cut glued Make sure point right way Hinge stabilizers elevators sand edges round Select two straight firm sheets 3 x h-in balsa fuselages Cut out side view per plans cut out underscoop well glue scoop until after final assembly ensuring model will set flat bench alignment firewalls can cut out well plywood nose doublers engine mount blocks Bend nose gear wires shape sew plywood doublers heavy thread Carefully glue doublers engine mount blocks firewalls place keeping align ment Wing fuselages drying cut out wing parts Begin outboard wing panels Pin leading trailing edges place glue ribs wing tip cyanoacrylate CyA glue As soon glue sets unpin panel turn over Lay sheet wax paper bottom wing pin leading trailing edges other wing panel bottom finished panel Glue ribs tip unpin panels bingo have two opposite wing panels Cut out pin down center section parts Make sure outer wing panels fit snugly place Block up outer panels dihedral shown plans glue wing together Keep fuselage slots wing open i fuselage check make sure slots parallel Add top spar bellcrank mount planking Once wing has cured sand required trial fit fuselages place Continued page 162 70 Model Aviation SAFETY NEEDLE REMOTE NEEDLE VALVE ADJUSTER KEEPS YOUR FINGERS SAFE DISTANCE FROM THE PROP ALLOWS PERFECT NEEDLE ADJUSTMENT FOR EVERY FLIGHT PRECISION GEAR TRAIN MAKES IT EASY TO SET ENGINE FOR PEAK POWER LO1 CONTROL ALLOWS DESIRED DRAG ON ADJUSTER KNOB FROM LOOSE TO LOCKED COMPLETE WITH MOUNTING HARDWARE S ADAPTERS FOR BENT OR KNOB TYPE NEEDLES FOR 19-108 ENGINES PRICE 512QO 550 MODEL PRODUCTS POST PAID PD BOX 4026 601 LEE ST CHECK OR MD DES PLAINES IL 60016 CL Navy Carrier Continued page 156 parts about option steel slide drill press helpful hand drill will suffice method construction obvious photographs dimensions various parts depend upon dimensions exhaust stack assembly will attached Size shape critical opening slide should tapered slide used conjunction intake throttle used primarily fuel metering described August column length taper may have adjusted provide optimum performance fuel mixture correct idle full throttle engine goes excessively rich throttle advanced slowly idle taper should shorter open faster engine lean slightly above idle taper should longer exhaust opening will increase slowly slide moved Adjustments can also made amount throttle arm movement relation exhaust slide movement Some experimentation will probably required before optimum setup achieved example shown mounted using 4-40 flat-head screws slide tracks attached base 2-56 screws although smaller ones will work just well best method maintain straight smooth edge brass slide tracks use finished edge strip interior side track cutting base wider finished dimension using -in-wide brass strip track parts outside edges slide unit can cut final size after assembly complete tested smooth operation cutting outside edges same operation smooth edge can produced minimum work On-Off pressure advent throttles contain own fuel metering has greatly simplified engine speed control use exhaust restrictors conjunction metering HOBBY __ outdated old discard older basic RC systems can easily update adding dual rates mixing extra channels frequency changes etc need basic electrical ability simple tools Written R/C tech 10 yrs exp 142 page journal includes sources diagrams charts detailed modifications written simple under standable text Send $1995 check money order SOBBY RADIO 3001-A Kavanaugh Rd Wilson NC 27893 Phone 919 291-8548 Hobby Radio also offers professional R/C repairs mods Complete systems service battery pack servos vibration testing new frequency change etc manu facturer repairs guaranteed performed minimal turnaround Send sase price list complete services carburetor can allow quite reliable engine speed control pressure fuel systems described August column An alternative system exists although little harder construct offers extreme ease adjustment system refer switched pressure/suction system type system operates pressure high speed switches suction low speed low speed intake throttle fixed engine speed controlled solely exhaust restrsctor Kavan pressure carburetor provides easiest method installing switched pressure suction system contains valve releases pressure fuel tank throttle closed have seen lately very expensive current-produc tion items have never great supply photo shows Kavan carb overcenter spring used hold carb both open closed positions carb opened manually before engine started closed small-diameter cable throttle closed first time very flexible cable allows free movement exhaust restrictor movement intake throttle alternative Kavan pressure carb Any carb fuel meter can used release pressure fuel tank simple device shown photographs works well wire Yes-in diameter can same wire operates intake throttle housing pinches vent line cap Bic pen protective covers needles some hypodermic syringes will also work well little harder find large brass eyelet could also substituted tubing would have replaced often Surgical tubing used tanks vent line During high-speed flight tubing pinched inside housing sealing tube very effec tively thereby trapping pressure inside fuel tank wire loop moved out housing surgical tubing straightens out allows pressure escape fuel tank vent line must placed upper inside forward portion tank prevent fuel being forced out vent line set up speed control open exhaust restrictor intake throttle tank vent closed set needle valve best highspeed performance Minor changes highspeed setting should have little effect lowspeed adjustments Next close intake throttle tank vent open leave exhaust restrictor fully open Set idle speed adjustment stop carb opening engine speed maximum anticipate needing during low-speed flight prob ably 12000 15000 rpm Set idle mixture adjustment produce slightly rich run exhaust restrictor open Close exhaust restric br gradually until desired low speed achieved adjust linkage slide will stop point bellcrank full low-speed position Throttle response should smooth rapid should independent rate throttle opened have found systems such very tolerant changes fuel altitude weather few changes required idle mixture once initial settings satisfactory having difficulty current pressure-throttle arrangement con sider switched pressure/suction system may pleasantly surprised Richard L Perry 10035 Deadwood Ave Ellsworth AFB SD 57706 JU-635/Netson Continued page 70 Give wing few coats dope sand off fuzz Cover medium-to-heavy silkspan shrink water dry apply two three coats thinned dope wing fuselage tail semblies Sand fit rudders top fuselages nowthe lower rudders will added later Place wing flat surface align glue fuselages wing getting parallel possible other Fit stabilizer assemblies place Line up above rear make sure level hinge lines straight Continued page 168 162 Model Aviation CA MASK CA glue works wonders building models right Unfortunately gives off enough fumes knock vulture off carcass modelers have suffered medical problems after inhaling CA fumes take chances special vapor respirator filters CA fumes soft face mask adjustable straps comfortably fits face sizes easy breathing valve allows prolonged use providing dependable filtering concentrations up 1000 PPM though rugged industrial mask light weight elimi nate fatigue Dont get gassed CA Get protected Order CA Mask today Just $1247 shipping cheaper hospital visit Money order Master Charge Visa include expiration date check allow 20 days clearl Sorry no CODs Pelican Enterprises Inc 265 OXFORD LANE BLOOMINGOALE ILLINOIS 60108 F S Send catalog modelers safety supplies other Glue place bend up /16-rn music wire elevator joiner Use CyA tack place carefully sew elevators shown plans Check fuselages make sure still parallel finish gluing wire joiner place setting cut out plywood landing gear doors give few coats dope seal off Bend main landing gear wires shape sew gear doors wire shown Now add lower scoops nose gear doors main landing gears lower rudders fuselages Finishing chose paint model common Luftwaffe splinter pattern light blue undersides dark green/black green upper surfaces canopies painted black outlined silver pin-stripping tape crosses cut black white MonoKote trim sheets stuck place Install engines wheels rear props Add drop CyA glue rear prop screws keep coming off flight should little trouble balancing Ju-6 35 check just same Add needed weight Twins lot fun fly much fun sit monkey field Test run engines before go out fly should start run well individually together Try tuning same pitch timing runs longer running two engines should put inboard fuselage Once satisfied performance get some 30-ft steel lines head field Warm up engines set needle valves harmony Shut engines down refuel hook up lines Ju 635 rolls out rather awkwardly its four wheels picks up speed quickly will break ground touch elevator air very stable maneuverable engine settles down slow steady flight pattern yet still responsive Have fun reliving past never got happen FF Old-Timers/Haught Continued page 71 engine started booster batteriesonly have quit switched over flight batteries Today larger models use alkaline C D batteries flight pack start engine booster batteries bench-running still prefer use boosters made hooking two *6 dry cells series provide required three volts use boosters small models equipped AA flight batteries Incidentally polarity ignition system optional care must used using booster batteries reversing polarity will ruin flight pack Ignition engines run slower glow counterparts generally require propeller has larger diameter lower pitch As rule thumb usually use nine-inch-diameter prop small engines up 19 cu displace ment 10-in small Class B up 25 cu li-in 29s 14-in 60s Pitch neighborhood four six inches like use largest propeller will still allow engine attaln its original rated rpm Fuel ignition engine must mixed Although ignition engines will run fine glow fuel SAM competition rules require gas-andoil mixture originally recommended formula three four parts white gasoline part SAE 70 motor oil Motorcycle oil used call RMcM White gasoline no longer available local service station unleaded auto gas welcome substitute oil now problem SAE 70 oil used available motorcycle shops scarce now use Aviation SAE 60 uncompounded oil local airport mix three-to-one unleaded gasoline seems work fine Some suppliers offer mixed fuel oil other lubrication additives have no current information whats available Perhaps some out can help out Before attempting start ignition engine other caution worth mentioning old engines designed used electric starters Electric starters place reverse thrust load crankshaft may push back crankcase far enough rotating crankpin chew up rear engine casting best using electric starter places undue strain crankshaft bushings meet rear prop drive washer Newly converted glow engines may handle starters just fine unless original replica engine has ball thrust bearing will better off hand-cranking engine obtain maximum power ignition must occur near top dead center pistons strokeand preferably just before piston reaches top dead center allow fuel/air mixture begin burning before piston starts down thereby assuring maximum energy will utilized Trying start engine spark timed occur top dead center can result backfiring kicking engine turn can whack good finger avoid situation engine cranked spark-timing retarded Simply move adjust able timer-arm direction propeller rotation few degrees ignition will occur Continued page 170 168 Model Aviation RC SOARING DIGEST monthly publication covering International RC Soaring Scene SI 6/yearin USA US $20/yr Canada& Mexico US $24/yr elsewhere via airmail RCSD PO Box 269 Peterborough NH 03458 hate install hinges Try Easy Hinges See Difference single slot few drops CIA glue Its done No gouging pinning hinge pins worry about Incredibly strong Virtually indestructible 24 hinges 0295 P0 Box 1743 Marcos CA 92069 WETPOXY SAFE OXY unique two-component epoxy laminating system developed offer user safest highest quality laminating resin available VA Pt Kit- $1400 VA Ot Kit- $2100 Glass Cloth 58 oz/sq yd 38x6ft-$90038xl5ft-$1900 38x30ft-$3500 add $250 Ship & Hand above inems Send SASE additional information AcPs Ughtweight comsite Materials Order COD Send check Money Order AEROSPACE COMPOSITE PRODUCTS P0 Boa 16621 IDept Al Irvine CA 92714 Source tor Lightweight Materials JU-635/Nelson Continued page 162 Fokker D-VII VK Model Aircraft PO Box 3007 Aurora 1160505 312-357-1883