Foam Techniques conclusion three-part coverage explains everything youll ever need know about skinning B Bill Evans Max Lester part 3 FAST CONSTRUCTION best reasons using Polystyrene foamcore wings Once techniques cutting cores described Parts II learned equally simple foam covering techniques can acquired almost before can sort out parts builtup wing techniques will made clear read background given enable get maximum advan tages foam avoiding pitfalls Properties Foam Reasons Covering Mechanical Damage Denting Foam relatively soft can permanently deformed easily harder materials same characteristic allows absorb shock better hard brittle material covering foam firmer material force spread over larger area shock absorbed foam protects foam denting firmer covering material break ing strength across grain Balsa has about 10 times compres sive strength l-pcf density beadhoard Bonding thin skin heavier higher strength materialsuch cardboard bal sa plywoodto foam significantly increases ability foam stand high wing loadings Similarly materials have much higher shear strength provides greater protection against breaking wing impact Chemical Damage Solvents The greatest chemical danger foam wings generally due use ad hesives containing solvents attack foam Some cannot used bond ing foam foam foam balsa other covering materials used sheet wings Others can used great care second frequent source chemical damage application paints finishes containing sol vents either directly foam semi-porous sheeting materials Another common source chemical damage foam fuels used model air craft engines cleaning materials used remove fuel addition covering materials pro tective coatings such epoxy paints ex cept solvent carrier like spray cans shellac water-based paints can used protect foam chemical damage Ultraviolet light particularly sunlight eventually damages foam Anything screens foam light way covering opaque coating materials will protect foam Effect Different Coverings Properties Skin Materials Shape The foam holds skin bonded shapes increases resistance bending same manner tube re sists bending compared flat sheet closer cross section approaches round tube greater resistance bending Effect Different Coverings erties Skin Materials General Tensile Strength grain psi psi psi psi psi Aircraft Plywood* 6300 8200 700 5500 1700 40-50 Balsa 100 2000 150 10 pcI Foam 21 20 pcI Styrofoam 70 symmetrical wing therefore stronger stance bending flat bottom serve several rength hardness edge strikes de strong bond utbor generally uses ver spruce may aircraft added also protection le strong 10 white glues strong epoxy has disadvantage being difficult sand partla stren tical also full high ui spar can y used against fligh line thc ovide st gear sary m spar acts sr strong two thirds chord depth cn cut table radial saw wing constant chord depth U may turned over inthe cut maintair h spar iieyTo lay out spar se forinto slot use marking guide Thi should cut just oul sanded block sand actly flush wino si liberally coated leading edge place full span spa strength March 1978 rs Plat ester r 44 Model uc w neral rule th glue sneets t width ol ther width slight excess g surface ssume top c desired edges toge eating straight edge eaa wirn wn e Titebond t fiat scr single edge raz ce weights nilow dry sand the joints move theta oat surfa side water-base use w position 1 cmi t firmly fo r rolling d iu side vhich ti side An pro wer l Put joint t Lir st wings iT panels slidi easuring rface witl fluE CT willi designs Completed wing panel skinne covered piece hat underside w Daded down center wit sure gri rom corner u can return t oId half c ild fairly smoothh will tend wi ily straight Un grain business c find can s iction lower re along grain witl rtunately muc s grain parallel side parallel longer cover g the Cardboard grain direci tional surface preparation cardboardwhich potential disaov readily shaped Si less plywood bals just cardboard ng characteristics Thickness should about heavier business cards match Right wing panel blo wood braces Applying 5-minute masks Choice fin 46 Model Aviation ting cards file folders fairly hard non ild long enough witn e grain cardboar panel splicing Grain Direction C tily parallel g s stiffer perpendicu1 edral joint center surfaces panels ji bottom Note placement ma re gullionsdepend needs tile] GRISH AIRCRAFT TYPE PROPELLERS Made hardwood fully carved true helical pitch airfoil ready sanding ALL SIZES INir$700 8 & 10 PITCH20800 RIGHT HAND221000 ROTATION241300 3/8 BORE AT YOuR DEALER USE TO PROPEL AIR CREATE THRUST AND BE PROPELLED BY AIR AT DISCRETION OF THE PURCHASER PROPELLERS ALL GRISH PROPELLERS ARE ENGINEERED TO TRUEHELICAL PITCH AND AIRFOIL FOR EFFICIENCY NEW COLOR. OLD PRICES 2 Blade Tractor 545/354-430d 636435 747-678SOd 84868-865d 949697 9-810-410-6 85d 11411-611-8 Si 12-412-512-6 8150 YELLOW propellers phasing out NATURAL WHITE phases Minor production savings help hold down prices Grish engineered airefficiency strength remain same either color ular site 150 put circle would have helped lot Oshkosh Nats 73 forced fly 150 runways center circle now called Pilots Circle still 5 radius big change next circle called Pitting Circle 15 radius rather 20 before out event has its own set circle radii form set Outer Circle event becomes Inner Circle another thus minimizing number circles have paint mark Racing events circle radii 5 15 48 58 68 76 Probably significant changes allow constant-diameter exhaust extension racing events ex cept Slow Rat use exhaust extension prohibited elim inates megaphones Goodyear should help event dont believe pipe really helps vast majority Goodyears theyre run anyhow True few really go worth nothing noise unre liability Good riddance Now lets see minipipe will help Running openface will bring some racers back Goodyear left noise megaphone scared off Another change going make lot people unhappy engine restric tion Slow Rat Basically change says engine must have produced 36 smaller significant parts have produced excludes head bolts needle valve venturi prop washer nut etc cludes complete crankcase including front end back end upper lower portion detachable split ex cluding ball bearings applicable engine crankshaft cylinder sleeve piston about rule will ap pear book What rule does say CLCB will have de fine what constitutes original manufacturer engine better yet what defines production engine look around at least couple sources what might call homebuilt engines use least few parts similar engine different manufacturer going legal illegal dont know sure would hate see small guy driven off rule Goodyear has couple important changes First hand-on-chest rule flying gone Second semi-final/final system also gone No longer fly 80-lap semi-finals take three best final race really would know best flight No now back 12 finals top runner turkey trot heat gets win everyone can go home grum ble Id just good heat Id have won Oh well cant win em Rat Race Slow Rat Race since tied together benefited change affects races well construction techniques final race Rat Slow Rat now has three pit stops 140 laps rather two previously What means race times next year will longer year about 10-15 sec onds Also dont have set up Rats differently now qualifying heats finals three stops 140-lap final race will four 35-lap segments rather three 47-lap pieces previously nice part qualifying heats two 35-lap seg ments can set up plane 35 laps per tank entire event rather have allow longer segments used have run Nelson Competition Products Just re ceived note Henry Nelson Nelson Competition Engines 729 Valemont Dr Verona PA 15147 current infor mation two real quality products produces FAI Team Race crowd Nelson 15D engine cast magnesium engine mounts Let quote little Henry st advertis ing has Metkmeijers fastest heat time British Nats leave catch boat didnt fly finals won Bo chum West Germany Utrecht Holland Just shows what really good team can dead stock engine Handy Hint friend friend piano tuner trade curse uses piano wire quite regularly made good suggestion tried make up next set control lines out piano wire sprinkle little talcum powder wire after roll lines onto reel keeps lines rust ing storage After unroll lines use wipe clean rag redust after roll back up W R Lee 3522 Tamarisk Lane Missouri City TX 77459 Foa rn/Evans/Lester continued page 46 piece hardwood landing gear block except should glued place until after wing halves have least trial joined insure proper align ment dihedral Ailerons design calls ailerons probably will using full length strip ailerons authors find Scotch similar tape makes neat dur able easy-to-install hinge controls attached same manner builtup wing sufficiently experienced building design in-set ailerons following suggestions may prove helpful techniques found successful foam wings Pushrods Through Wing way make 98 Model Aviation 3 ADE 5V3 2 Blade Pusher 5-4636-4 35d 8-685d 9-610-6 Si 3 Blade Tractor 5-36-36-4 SOd 3 Blade Pusher 6-3SOd Made polyeste, boll color/- AT YOUR DEALER6-68-8 S125 9610-610-4 5150Pusher10-6$150 GRISH HN INDIANA 44373 hole pushrod through wing cut core cutting bow must done before sheeting Make root tip templates hole drilled desired location cut thin slot template just large enough cutting wire Pass hot wire down through slot around hole back out slot Another way cut channel saw Dremel tool Xacto knife using guide want eliminate bellcrank use flexible control rod cut slot curves back trailing edge large enough piece Nyrod Inset Ailerons method install hinge mount foam core prior sheeting First lay out aileron core fine tip marking pen Cut hard piece /s X lsa about /2 shorter aileron Lay place trace around marking pen Rout out slot fits flush glue place must flush foam because will sheet over Cut aileron out wing after sheeting number methods can used complete aileron re move sufficient material sheet ex posed foam edges Another remove sufficient material install concave-con vex mating hardwood aileron strips An other approach use rod through foam near leading edge aileron can used combination hinge control arm Applying Finishes Coatings After wing sheeted ready apply finish coating looks protection sheeting material fuel moisture etc easiest fastest coating Solarfilm Monokote etc Pre paration consists sanding balsa sheeting edges plywood card board sheeting plan cover unsheeted foam wings iron-on films sand put coat water-based paint insure smooth job Use extra care iron keeping moving avoid softening foam Preparation other finishes involves bit sanding balsa plywood ending about 320 wet-or-dry want higher quality finish can use almost type paint cover cardboard balsa plywood sheeting provided take certain pre cautions materials attack foam using airplane dope lacquer spray paints containing solvents etc following precautions must taken foam core may ruined First make sure cracks edges sealed Sec ond apply first two three coats very thin coatings allow dry thor oughly between coats doesnt mean just touch solvents soaked surface balsa cardboard plywood must have time com pletely evaporate before next coat Otherwise trapped solvents will soak through may attack foam core preferable apply primer coat material wont attack foam also compatible finish coats materials several light coats better heavy coat get hard smooth high gloss durable finish information presented series articles serious effort provide sufficient detail used described will enable enjoy ad vantages foam wing construction handy use may wish cut out text place folder FF Indoor/Tenny continued page 51 permitted times other open house activity Field Accessories inter esting things about attending indoor con tests note gadgets dreamed up fliers make easier handle fly models Winders torquemeters repair jigs rubber strippers etcall either necessary very desirableand demonstrating ingenuity models basic item run-down stand used hold assembled model whenever isnt being flown handiest right after flight since sup ports model prop free rotate allowing motor unwind run down other times model held safelyfar immune damage laid down Also run down stand allows close hands-off inspec tion permits minor repairs made using both hands repair photos show simplest elegant run-down stands simple small block plastic foam rubber slot top takes minutes build does good job holding model dowel rod stuck hole bottom white glue serves support other end rod can stuck weighted base clamped side model box foam rubber block somewhat bulky pack definitely fragile elegant stand designed orig inally Bill Hulbert shown photos constructed Stan Chilton works like clothespin except spring tension just enough hold model safely inner surface jaws covered plastic foam rubber cushion motor stick help hold securely No matter what run-down stand design must have important featureit must possible remove model safely hand rea son fliers wind rubber mo tors torque meter stooge broken motor inconvenience likely damage model motor breaks during winding model So flier must free wind motor hold end wound motor hand fetch model other hand Torque Meter serious indoor fli ers almost using torque meter anchor rubber motor winding advantages besides model safety does guess about energy stored motor wind-up can essentially identical previous knowing launch torque can avoid winding too much ceiling height flying conditions photos show Stan Chiltons torque meter dial March1978 99 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andresvs Aircraft Model Co Inc US Etc 1& North St Topsfjeld Mass 01983 887-8541 Price $3995 kit per dollar- bar em all
Edition: Model Aviation - 1978/03
Page Numbers: 42, 43, 44, 45, 46, 98, 99
Foam Techniques conclusion three-part coverage explains everything youll ever need know about skinning B Bill Evans Max Lester part 3 FAST CONSTRUCTION best reasons using Polystyrene foamcore wings Once techniques cutting cores described Parts II learned equally simple foam covering techniques can acquired almost before can sort out parts builtup wing techniques will made clear read background given enable get maximum advan tages foam avoiding pitfalls Properties Foam Reasons Covering Mechanical Damage Denting Foam relatively soft can permanently deformed easily harder materials same characteristic allows absorb shock better hard brittle material covering foam firmer material force spread over larger area shock absorbed foam protects foam denting firmer covering material break ing strength across grain Balsa has about 10 times compres sive strength l-pcf density beadhoard Bonding thin skin heavier higher strength materialsuch cardboard bal sa plywoodto foam significantly increases ability foam stand high wing loadings Similarly materials have much higher shear strength provides greater protection against breaking wing impact Chemical Damage Solvents The greatest chemical danger foam wings generally due use ad hesives containing solvents attack foam Some cannot used bond ing foam foam foam balsa other covering materials used sheet wings Others can used great care second frequent source chemical damage application paints finishes containing sol vents either directly foam semi-porous sheeting materials Another common source chemical damage foam fuels used model air craft engines cleaning materials used remove fuel addition covering materials pro tective coatings such epoxy paints ex cept solvent carrier like spray cans shellac water-based paints can used protect foam chemical damage Ultraviolet light particularly sunlight eventually damages foam Anything screens foam light way covering opaque coating materials will protect foam Effect Different Coverings Properties Skin Materials Shape The foam holds skin bonded shapes increases resistance bending same manner tube re sists bending compared flat sheet closer cross section approaches round tube greater resistance bending Effect Different Coverings erties Skin Materials General Tensile Strength grain psi psi psi psi psi Aircraft Plywood* 6300 8200 700 5500 1700 40-50 Balsa 100 2000 150 10 pcI Foam 21 20 pcI Styrofoam 70 symmetrical wing therefore stronger stance bending flat bottom serve several rength hardness edge strikes de strong bond utbor generally uses ver spruce may aircraft added also protection le strong 10 white glues strong epoxy has disadvantage being difficult sand partla stren tical also full high ui spar can y used against fligh line thc ovide st gear sary m spar acts sr strong two thirds chord depth cn cut table radial saw wing constant chord depth U may turned over inthe cut maintair h spar iieyTo lay out spar se forinto slot use marking guide Thi should cut just oul sanded block sand actly flush wino si liberally coated leading edge place full span spa strength March 1978 rs Plat ester r 44 Model uc w neral rule th glue sneets t width ol ther width slight excess g surface ssume top c desired edges toge eating straight edge eaa wirn wn e Titebond t fiat scr single edge raz ce weights nilow dry sand the joints move theta oat surfa side water-base use w position 1 cmi t firmly fo r rolling d iu side vhich ti side An pro wer l Put joint t Lir st wings iT panels slidi easuring rface witl fluE CT willi designs Completed wing panel skinne covered piece hat underside w Daded down center wit sure gri rom corner u can return t oId half c ild fairly smoothh will tend wi ily straight Un grain business c find can s iction lower re along grain witl rtunately muc s grain parallel side parallel longer cover g the Cardboard grain direci tional surface preparation cardboardwhich potential disaov readily shaped Si less plywood bals just cardboard ng characteristics Thickness should about heavier business cards match Right wing panel blo wood braces Applying 5-minute masks Choice fin 46 Model Aviation ting cards file folders fairly hard non ild long enough witn e grain cardboar panel splicing Grain Direction C tily parallel g s stiffer perpendicu1 edral joint center surfaces panels ji bottom Note placement ma re gullionsdepend needs tile] GRISH AIRCRAFT TYPE PROPELLERS Made hardwood fully carved true helical pitch airfoil ready sanding ALL SIZES INir$700 8 & 10 PITCH20800 RIGHT HAND221000 ROTATION241300 3/8 BORE AT YOuR DEALER USE TO PROPEL AIR CREATE THRUST AND BE PROPELLED BY AIR AT DISCRETION OF THE PURCHASER PROPELLERS ALL GRISH PROPELLERS ARE ENGINEERED TO TRUEHELICAL PITCH AND AIRFOIL FOR EFFICIENCY NEW COLOR. OLD PRICES 2 Blade Tractor 545/354-430d 636435 747-678SOd 84868-865d 949697 9-810-410-6 85d 11411-611-8 Si 12-412-512-6 8150 YELLOW propellers phasing out NATURAL WHITE phases Minor production savings help hold down prices Grish engineered airefficiency strength remain same either color ular site 150 put circle would have helped lot Oshkosh Nats 73 forced fly 150 runways center circle now called Pilots Circle still 5 radius big change next circle called Pitting Circle 15 radius rather 20 before out event has its own set circle radii form set Outer Circle event becomes Inner Circle another thus minimizing number circles have paint mark Racing events circle radii 5 15 48 58 68 76 Probably significant changes allow constant-diameter exhaust extension racing events ex cept Slow Rat use exhaust extension prohibited elim inates megaphones Goodyear should help event dont believe pipe really helps vast majority Goodyears theyre run anyhow True few really go worth nothing noise unre liability Good riddance Now lets see minipipe will help Running openface will bring some racers back Goodyear left noise megaphone scared off Another change going make lot people unhappy engine restric tion Slow Rat Basically change says engine must have produced 36 smaller significant parts have produced excludes head bolts needle valve venturi prop washer nut etc cludes complete crankcase including front end back end upper lower portion detachable split ex cluding ball bearings applicable engine crankshaft cylinder sleeve piston about rule will ap pear book What rule does say CLCB will have de fine what constitutes original manufacturer engine better yet what defines production engine look around at least couple sources what might call homebuilt engines use least few parts similar engine different manufacturer going legal illegal dont know sure would hate see small guy driven off rule Goodyear has couple important changes First hand-on-chest rule flying gone Second semi-final/final system also gone No longer fly 80-lap semi-finals take three best final race really would know best flight No now back 12 finals top runner turkey trot heat gets win everyone can go home grum ble Id just good heat Id have won Oh well cant win em Rat Race Slow Rat Race since tied together benefited change affects races well construction techniques final race Rat Slow Rat now has three pit stops 140 laps rather two previously What means race times next year will longer year about 10-15 sec onds Also dont have set up Rats differently now qualifying heats finals three stops 140-lap final race will four 35-lap segments rather three 47-lap pieces previously nice part qualifying heats two 35-lap seg ments can set up plane 35 laps per tank entire event rather have allow longer segments used have run Nelson Competition Products Just re ceived note Henry Nelson Nelson Competition Engines 729 Valemont Dr Verona PA 15147 current infor mation two real quality products produces FAI Team Race crowd Nelson 15D engine cast magnesium engine mounts Let quote little Henry st advertis ing has Metkmeijers fastest heat time British Nats leave catch boat didnt fly finals won Bo chum West Germany Utrecht Holland Just shows what really good team can dead stock engine Handy Hint friend friend piano tuner trade curse uses piano wire quite regularly made good suggestion tried make up next set control lines out piano wire sprinkle little talcum powder wire after roll lines onto reel keeps lines rust ing storage After unroll lines use wipe clean rag redust after roll back up W R Lee 3522 Tamarisk Lane Missouri City TX 77459 Foa rn/Evans/Lester continued page 46 piece hardwood landing gear block except should glued place until after wing halves have least trial joined insure proper align ment dihedral Ailerons design calls ailerons probably will using full length strip ailerons authors find Scotch similar tape makes neat dur able easy-to-install hinge controls attached same manner builtup wing sufficiently experienced building design in-set ailerons following suggestions may prove helpful techniques found successful foam wings Pushrods Through Wing way make 98 Model Aviation 3 ADE 5V3 2 Blade Pusher 5-4636-4 35d 8-685d 9-610-6 Si 3 Blade Tractor 5-36-36-4 SOd 3 Blade Pusher 6-3SOd Made polyeste, boll color/- AT YOUR DEALER6-68-8 S125 9610-610-4 5150Pusher10-6$150 GRISH HN INDIANA 44373 hole pushrod through wing cut core cutting bow must done before sheeting Make root tip templates hole drilled desired location cut thin slot template just large enough cutting wire Pass hot wire down through slot around hole back out slot Another way cut channel saw Dremel tool Xacto knife using guide want eliminate bellcrank use flexible control rod cut slot curves back trailing edge large enough piece Nyrod Inset Ailerons method install hinge mount foam core prior sheeting First lay out aileron core fine tip marking pen Cut hard piece /s X lsa about /2 shorter aileron Lay place trace around marking pen Rout out slot fits flush glue place must flush foam because will sheet over Cut aileron out wing after sheeting number methods can used complete aileron re move sufficient material sheet ex posed foam edges Another remove sufficient material install concave-con vex mating hardwood aileron strips An other approach use rod through foam near leading edge aileron can used combination hinge control arm Applying Finishes Coatings After wing sheeted ready apply finish coating looks protection sheeting material fuel moisture etc easiest fastest coating Solarfilm Monokote etc Pre paration consists sanding balsa sheeting edges plywood card board sheeting plan cover unsheeted foam wings iron-on films sand put coat water-based paint insure smooth job Use extra care iron keeping moving avoid softening foam Preparation other finishes involves bit sanding balsa plywood ending about 320 wet-or-dry want higher quality finish can use almost type paint cover cardboard balsa plywood sheeting provided take certain pre cautions materials attack foam using airplane dope lacquer spray paints containing solvents etc following precautions must taken foam core may ruined First make sure cracks edges sealed Sec ond apply first two three coats very thin coatings allow dry thor oughly between coats doesnt mean just touch solvents soaked surface balsa cardboard plywood must have time com pletely evaporate before next coat Otherwise trapped solvents will soak through may attack foam core preferable apply primer coat material wont attack foam also compatible finish coats materials several light coats better heavy coat get hard smooth high gloss durable finish information presented series articles serious effort provide sufficient detail used described will enable enjoy ad vantages foam wing construction handy use may wish cut out text place folder FF Indoor/Tenny continued page 51 permitted times other open house activity Field Accessories inter esting things about attending indoor con tests note gadgets dreamed up fliers make easier handle fly models Winders torquemeters repair jigs rubber strippers etcall either necessary very desirableand demonstrating ingenuity models basic item run-down stand used hold assembled model whenever isnt being flown handiest right after flight since sup ports model prop free rotate allowing motor unwind run down other times model held safelyfar immune damage laid down Also run down stand allows close hands-off inspec tion permits minor repairs made using both hands repair photos show simplest elegant run-down stands simple small block plastic foam rubber slot top takes minutes build does good job holding model dowel rod stuck hole bottom white glue serves support other end rod can stuck weighted base clamped side model box foam rubber block somewhat bulky pack definitely fragile elegant stand designed orig inally Bill Hulbert shown photos constructed Stan Chilton works like clothespin except spring tension just enough hold model safely inner surface jaws covered plastic foam rubber cushion motor stick help hold securely No matter what run-down stand design must have important featureit must possible remove model safely hand rea son fliers wind rubber mo tors torque meter stooge broken motor inconvenience likely damage model motor breaks during winding model So flier must free wind motor hold end wound motor hand fetch model other hand Torque Meter serious indoor fli ers almost using torque meter anchor rubber motor winding advantages besides model safety does guess about energy stored motor wind-up can essentially identical previous knowing launch torque can avoid winding too much ceiling height flying conditions photos show Stan Chiltons torque meter dial March1978 99 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andresvs Aircraft Model Co Inc US Etc 1& North St Topsfjeld Mass 01983 887-8541 Price $3995 kit per dollar- bar em all
Edition: Model Aviation - 1978/03
Page Numbers: 42, 43, 44, 45, 46, 98, 99
Foam Techniques conclusion three-part coverage explains everything youll ever need know about skinning B Bill Evans Max Lester part 3 FAST CONSTRUCTION best reasons using Polystyrene foamcore wings Once techniques cutting cores described Parts II learned equally simple foam covering techniques can acquired almost before can sort out parts builtup wing techniques will made clear read background given enable get maximum advan tages foam avoiding pitfalls Properties Foam Reasons Covering Mechanical Damage Denting Foam relatively soft can permanently deformed easily harder materials same characteristic allows absorb shock better hard brittle material covering foam firmer material force spread over larger area shock absorbed foam protects foam denting firmer covering material break ing strength across grain Balsa has about 10 times compres sive strength l-pcf density beadhoard Bonding thin skin heavier higher strength materialsuch cardboard bal sa plywoodto foam significantly increases ability foam stand high wing loadings Similarly materials have much higher shear strength provides greater protection against breaking wing impact Chemical Damage Solvents The greatest chemical danger foam wings generally due use ad hesives containing solvents attack foam Some cannot used bond ing foam foam foam balsa other covering materials used sheet wings Others can used great care second frequent source chemical damage application paints finishes containing sol vents either directly foam semi-porous sheeting materials Another common source chemical damage foam fuels used model air craft engines cleaning materials used remove fuel addition covering materials pro tective coatings such epoxy paints ex cept solvent carrier like spray cans shellac water-based paints can used protect foam chemical damage Ultraviolet light particularly sunlight eventually damages foam Anything screens foam light way covering opaque coating materials will protect foam Effect Different Coverings Properties Skin Materials Shape The foam holds skin bonded shapes increases resistance bending same manner tube re sists bending compared flat sheet closer cross section approaches round tube greater resistance bending Effect Different Coverings erties Skin Materials General Tensile Strength grain psi psi psi psi psi Aircraft Plywood* 6300 8200 700 5500 1700 40-50 Balsa 100 2000 150 10 pcI Foam 21 20 pcI Styrofoam 70 symmetrical wing therefore stronger stance bending flat bottom serve several rength hardness edge strikes de strong bond utbor generally uses ver spruce may aircraft added also protection le strong 10 white glues strong epoxy has disadvantage being difficult sand partla stren tical also full high ui spar can y used against fligh line thc ovide st gear sary m spar acts sr strong two thirds chord depth cn cut table radial saw wing constant chord depth U may turned over inthe cut maintair h spar iieyTo lay out spar se forinto slot use marking guide Thi should cut just oul sanded block sand actly flush wino si liberally coated leading edge place full span spa strength March 1978 rs Plat ester r 44 Model uc w neral rule th glue sneets t width ol ther width slight excess g surface ssume top c desired edges toge eating straight edge eaa wirn wn e Titebond t fiat scr single edge raz ce weights nilow dry sand the joints move theta oat surfa side water-base use w position 1 cmi t firmly fo r rolling d iu side vhich ti side An pro wer l Put joint t Lir st wings iT panels slidi easuring rface witl fluE CT willi designs Completed wing panel skinne covered piece hat underside w Daded down center wit sure gri rom corner u can return t oId half c ild fairly smoothh will tend wi ily straight Un grain business c find can s iction lower re along grain witl rtunately muc s grain parallel side parallel longer cover g the Cardboard grain direci tional surface preparation cardboardwhich potential disaov readily shaped Si less plywood bals just cardboard ng characteristics Thickness should about heavier business cards match Right wing panel blo wood braces Applying 5-minute masks Choice fin 46 Model Aviation ting cards file folders fairly hard non ild long enough witn e grain cardboar panel splicing Grain Direction C tily parallel g s stiffer perpendicu1 edral joint center surfaces panels ji bottom Note placement ma re gullionsdepend needs tile] GRISH AIRCRAFT TYPE PROPELLERS Made hardwood fully carved true helical pitch airfoil ready sanding ALL SIZES INir$700 8 & 10 PITCH20800 RIGHT HAND221000 ROTATION241300 3/8 BORE AT YOuR DEALER USE TO PROPEL AIR CREATE THRUST AND BE PROPELLED BY AIR AT DISCRETION OF THE PURCHASER PROPELLERS ALL GRISH PROPELLERS ARE ENGINEERED TO TRUEHELICAL PITCH AND AIRFOIL FOR EFFICIENCY NEW COLOR. OLD PRICES 2 Blade Tractor 545/354-430d 636435 747-678SOd 84868-865d 949697 9-810-410-6 85d 11411-611-8 Si 12-412-512-6 8150 YELLOW propellers phasing out NATURAL WHITE phases Minor production savings help hold down prices Grish engineered airefficiency strength remain same either color ular site 150 put circle would have helped lot Oshkosh Nats 73 forced fly 150 runways center circle now called Pilots Circle still 5 radius big change next circle called Pitting Circle 15 radius rather 20 before out event has its own set circle radii form set Outer Circle event becomes Inner Circle another thus minimizing number circles have paint mark Racing events circle radii 5 15 48 58 68 76 Probably significant changes allow constant-diameter exhaust extension racing events ex cept Slow Rat use exhaust extension prohibited elim inates megaphones Goodyear should help event dont believe pipe really helps vast majority Goodyears theyre run anyhow True few really go worth nothing noise unre liability Good riddance Now lets see minipipe will help Running openface will bring some racers back Goodyear left noise megaphone scared off Another change going make lot people unhappy engine restric tion Slow Rat Basically change says engine must have produced 36 smaller significant parts have produced excludes head bolts needle valve venturi prop washer nut etc cludes complete crankcase including front end back end upper lower portion detachable split ex cluding ball bearings applicable engine crankshaft cylinder sleeve piston about rule will ap pear book What rule does say CLCB will have de fine what constitutes original manufacturer engine better yet what defines production engine look around at least couple sources what might call homebuilt engines use least few parts similar engine different manufacturer going legal illegal dont know sure would hate see small guy driven off rule Goodyear has couple important changes First hand-on-chest rule flying gone Second semi-final/final system also gone No longer fly 80-lap semi-finals take three best final race really would know best flight No now back 12 finals top runner turkey trot heat gets win everyone can go home grum ble Id just good heat Id have won Oh well cant win em Rat Race Slow Rat Race since tied together benefited change affects races well construction techniques final race Rat Slow Rat now has three pit stops 140 laps rather two previously What means race times next year will longer year about 10-15 sec onds Also dont have set up Rats differently now qualifying heats finals three stops 140-lap final race will four 35-lap segments rather three 47-lap pieces previously nice part qualifying heats two 35-lap seg ments can set up plane 35 laps per tank entire event rather have allow longer segments used have run Nelson Competition Products Just re ceived note Henry Nelson Nelson Competition Engines 729 Valemont Dr Verona PA 15147 current infor mation two real quality products produces FAI Team Race crowd Nelson 15D engine cast magnesium engine mounts Let quote little Henry st advertis ing has Metkmeijers fastest heat time British Nats leave catch boat didnt fly finals won Bo chum West Germany Utrecht Holland Just shows what really good team can dead stock engine Handy Hint friend friend piano tuner trade curse uses piano wire quite regularly made good suggestion tried make up next set control lines out piano wire sprinkle little talcum powder wire after roll lines onto reel keeps lines rust ing storage After unroll lines use wipe clean rag redust after roll back up W R Lee 3522 Tamarisk Lane Missouri City TX 77459 Foa rn/Evans/Lester continued page 46 piece hardwood landing gear block except should glued place until after wing halves have least trial joined insure proper align ment dihedral Ailerons design calls ailerons probably will using full length strip ailerons authors find Scotch similar tape makes neat dur able easy-to-install hinge controls attached same manner builtup wing sufficiently experienced building design in-set ailerons following suggestions may prove helpful techniques found successful foam wings Pushrods Through Wing way make 98 Model Aviation 3 ADE 5V3 2 Blade Pusher 5-4636-4 35d 8-685d 9-610-6 Si 3 Blade Tractor 5-36-36-4 SOd 3 Blade Pusher 6-3SOd Made polyeste, boll color/- AT YOUR DEALER6-68-8 S125 9610-610-4 5150Pusher10-6$150 GRISH HN INDIANA 44373 hole pushrod through wing cut core cutting bow must done before sheeting Make root tip templates hole drilled desired location cut thin slot template just large enough cutting wire Pass hot wire down through slot around hole back out slot Another way cut channel saw Dremel tool Xacto knife using guide want eliminate bellcrank use flexible control rod cut slot curves back trailing edge large enough piece Nyrod Inset Ailerons method install hinge mount foam core prior sheeting First lay out aileron core fine tip marking pen Cut hard piece /s X lsa about /2 shorter aileron Lay place trace around marking pen Rout out slot fits flush glue place must flush foam because will sheet over Cut aileron out wing after sheeting number methods can used complete aileron re move sufficient material sheet ex posed foam edges Another remove sufficient material install concave-con vex mating hardwood aileron strips An other approach use rod through foam near leading edge aileron can used combination hinge control arm Applying Finishes Coatings After wing sheeted ready apply finish coating looks protection sheeting material fuel moisture etc easiest fastest coating Solarfilm Monokote etc Pre paration consists sanding balsa sheeting edges plywood card board sheeting plan cover unsheeted foam wings iron-on films sand put coat water-based paint insure smooth job Use extra care iron keeping moving avoid softening foam Preparation other finishes involves bit sanding balsa plywood ending about 320 wet-or-dry want higher quality finish can use almost type paint cover cardboard balsa plywood sheeting provided take certain pre cautions materials attack foam using airplane dope lacquer spray paints containing solvents etc following precautions must taken foam core may ruined First make sure cracks edges sealed Sec ond apply first two three coats very thin coatings allow dry thor oughly between coats doesnt mean just touch solvents soaked surface balsa cardboard plywood must have time com pletely evaporate before next coat Otherwise trapped solvents will soak through may attack foam core preferable apply primer coat material wont attack foam also compatible finish coats materials several light coats better heavy coat get hard smooth high gloss durable finish information presented series articles serious effort provide sufficient detail used described will enable enjoy ad vantages foam wing construction handy use may wish cut out text place folder FF Indoor/Tenny continued page 51 permitted times other open house activity Field Accessories inter esting things about attending indoor con tests note gadgets dreamed up fliers make easier handle fly models Winders torquemeters repair jigs rubber strippers etcall either necessary very desirableand demonstrating ingenuity models basic item run-down stand used hold assembled model whenever isnt being flown handiest right after flight since sup ports model prop free rotate allowing motor unwind run down other times model held safelyfar immune damage laid down Also run down stand allows close hands-off inspec tion permits minor repairs made using both hands repair photos show simplest elegant run-down stands simple small block plastic foam rubber slot top takes minutes build does good job holding model dowel rod stuck hole bottom white glue serves support other end rod can stuck weighted base clamped side model box foam rubber block somewhat bulky pack definitely fragile elegant stand designed orig inally Bill Hulbert shown photos constructed Stan Chilton works like clothespin except spring tension just enough hold model safely inner surface jaws covered plastic foam rubber cushion motor stick help hold securely No matter what run-down stand design must have important featureit must possible remove model safely hand rea son fliers wind rubber mo tors torque meter stooge broken motor inconvenience likely damage model motor breaks during winding model So flier must free wind motor hold end wound motor hand fetch model other hand Torque Meter serious indoor fli ers almost using torque meter anchor rubber motor winding advantages besides model safety does guess about energy stored motor wind-up can essentially identical previous knowing launch torque can avoid winding too much ceiling height flying conditions photos show Stan Chiltons torque meter dial March1978 99 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andresvs Aircraft Model Co Inc US Etc 1& North St Topsfjeld Mass 01983 887-8541 Price $3995 kit per dollar- bar em all
Edition: Model Aviation - 1978/03
Page Numbers: 42, 43, 44, 45, 46, 98, 99
Foam Techniques conclusion three-part coverage explains everything youll ever need know about skinning B Bill Evans Max Lester part 3 FAST CONSTRUCTION best reasons using Polystyrene foamcore wings Once techniques cutting cores described Parts II learned equally simple foam covering techniques can acquired almost before can sort out parts builtup wing techniques will made clear read background given enable get maximum advan tages foam avoiding pitfalls Properties Foam Reasons Covering Mechanical Damage Denting Foam relatively soft can permanently deformed easily harder materials same characteristic allows absorb shock better hard brittle material covering foam firmer material force spread over larger area shock absorbed foam protects foam denting firmer covering material break ing strength across grain Balsa has about 10 times compres sive strength l-pcf density beadhoard Bonding thin skin heavier higher strength materialsuch cardboard bal sa plywoodto foam significantly increases ability foam stand high wing loadings Similarly materials have much higher shear strength provides greater protection against breaking wing impact Chemical Damage Solvents The greatest chemical danger foam wings generally due use ad hesives containing solvents attack foam Some cannot used bond ing foam foam foam balsa other covering materials used sheet wings Others can used great care second frequent source chemical damage application paints finishes containing sol vents either directly foam semi-porous sheeting materials Another common source chemical damage foam fuels used model air craft engines cleaning materials used remove fuel addition covering materials pro tective coatings such epoxy paints ex cept solvent carrier like spray cans shellac water-based paints can used protect foam chemical damage Ultraviolet light particularly sunlight eventually damages foam Anything screens foam light way covering opaque coating materials will protect foam Effect Different Coverings Properties Skin Materials Shape The foam holds skin bonded shapes increases resistance bending same manner tube re sists bending compared flat sheet closer cross section approaches round tube greater resistance bending Effect Different Coverings erties Skin Materials General Tensile Strength grain psi psi psi psi psi Aircraft Plywood* 6300 8200 700 5500 1700 40-50 Balsa 100 2000 150 10 pcI Foam 21 20 pcI Styrofoam 70 symmetrical wing therefore stronger stance bending flat bottom serve several rength hardness edge strikes de strong bond utbor generally uses ver spruce may aircraft added also protection le strong 10 white glues strong epoxy has disadvantage being difficult sand partla stren tical also full high ui spar can y used against fligh line thc ovide st gear sary m spar acts sr strong two thirds chord depth cn cut table radial saw wing constant chord depth U may turned over inthe cut maintair h spar iieyTo lay out spar se forinto slot use marking guide Thi should cut just oul sanded block sand actly flush wino si liberally coated leading edge place full span spa strength March 1978 rs Plat ester r 44 Model uc w neral rule th glue sneets t width ol ther width slight excess g surface ssume top c desired edges toge eating straight edge eaa wirn wn e Titebond t fiat scr single edge raz ce weights nilow dry sand the joints move theta oat surfa side water-base use w position 1 cmi t firmly fo r rolling d iu side vhich ti side An pro wer l Put joint t Lir st wings iT panels slidi easuring rface witl fluE CT willi designs Completed wing panel skinne covered piece hat underside w Daded down center wit sure gri rom corner u can return t oId half c ild fairly smoothh will tend wi ily straight Un grain business c find can s iction lower re along grain witl rtunately muc s grain parallel side parallel longer cover g the Cardboard grain direci tional surface preparation cardboardwhich potential disaov readily shaped Si less plywood bals just cardboard ng characteristics Thickness should about heavier business cards match Right wing panel blo wood braces Applying 5-minute masks Choice fin 46 Model Aviation ting cards file folders fairly hard non ild long enough witn e grain cardboar panel splicing Grain Direction C tily parallel g s stiffer perpendicu1 edral joint center surfaces panels ji bottom Note placement ma re gullionsdepend needs tile] GRISH AIRCRAFT TYPE PROPELLERS Made hardwood fully carved true helical pitch airfoil ready sanding ALL SIZES INir$700 8 & 10 PITCH20800 RIGHT HAND221000 ROTATION241300 3/8 BORE AT YOuR DEALER USE TO PROPEL AIR CREATE THRUST AND BE PROPELLED BY AIR AT DISCRETION OF THE PURCHASER PROPELLERS ALL GRISH PROPELLERS ARE ENGINEERED TO TRUEHELICAL PITCH AND AIRFOIL FOR EFFICIENCY NEW COLOR. OLD PRICES 2 Blade Tractor 545/354-430d 636435 747-678SOd 84868-865d 949697 9-810-410-6 85d 11411-611-8 Si 12-412-512-6 8150 YELLOW propellers phasing out NATURAL WHITE phases Minor production savings help hold down prices Grish engineered airefficiency strength remain same either color ular site 150 put circle would have helped lot Oshkosh Nats 73 forced fly 150 runways center circle now called Pilots Circle still 5 radius big change next circle called Pitting Circle 15 radius rather 20 before out event has its own set circle radii form set Outer Circle event becomes Inner Circle another thus minimizing number circles have paint mark Racing events circle radii 5 15 48 58 68 76 Probably significant changes allow constant-diameter exhaust extension racing events ex cept Slow Rat use exhaust extension prohibited elim inates megaphones Goodyear should help event dont believe pipe really helps vast majority Goodyears theyre run anyhow True few really go worth nothing noise unre liability Good riddance Now lets see minipipe will help Running openface will bring some racers back Goodyear left noise megaphone scared off Another change going make lot people unhappy engine restric tion Slow Rat Basically change says engine must have produced 36 smaller significant parts have produced excludes head bolts needle valve venturi prop washer nut etc cludes complete crankcase including front end back end upper lower portion detachable split ex cluding ball bearings applicable engine crankshaft cylinder sleeve piston about rule will ap pear book What rule does say CLCB will have de fine what constitutes original manufacturer engine better yet what defines production engine look around at least couple sources what might call homebuilt engines use least few parts similar engine different manufacturer going legal illegal dont know sure would hate see small guy driven off rule Goodyear has couple important changes First hand-on-chest rule flying gone Second semi-final/final system also gone No longer fly 80-lap semi-finals take three best final race really would know best flight No now back 12 finals top runner turkey trot heat gets win everyone can go home grum ble Id just good heat Id have won Oh well cant win em Rat Race Slow Rat Race since tied together benefited change affects races well construction techniques final race Rat Slow Rat now has three pit stops 140 laps rather two previously What means race times next year will longer year about 10-15 sec onds Also dont have set up Rats differently now qualifying heats finals three stops 140-lap final race will four 35-lap segments rather three 47-lap pieces previously nice part qualifying heats two 35-lap seg ments can set up plane 35 laps per tank entire event rather have allow longer segments used have run Nelson Competition Products Just re ceived note Henry Nelson Nelson Competition Engines 729 Valemont Dr Verona PA 15147 current infor mation two real quality products produces FAI Team Race crowd Nelson 15D engine cast magnesium engine mounts Let quote little Henry st advertis ing has Metkmeijers fastest heat time British Nats leave catch boat didnt fly finals won Bo chum West Germany Utrecht Holland Just shows what really good team can dead stock engine Handy Hint friend friend piano tuner trade curse uses piano wire quite regularly made good suggestion tried make up next set control lines out piano wire sprinkle little talcum powder wire after roll lines onto reel keeps lines rust ing storage After unroll lines use wipe clean rag redust after roll back up W R Lee 3522 Tamarisk Lane Missouri City TX 77459 Foa rn/Evans/Lester continued page 46 piece hardwood landing gear block except should glued place until after wing halves have least trial joined insure proper align ment dihedral Ailerons design calls ailerons probably will using full length strip ailerons authors find Scotch similar tape makes neat dur able easy-to-install hinge controls attached same manner builtup wing sufficiently experienced building design in-set ailerons following suggestions may prove helpful techniques found successful foam wings Pushrods Through Wing way make 98 Model Aviation 3 ADE 5V3 2 Blade Pusher 5-4636-4 35d 8-685d 9-610-6 Si 3 Blade Tractor 5-36-36-4 SOd 3 Blade Pusher 6-3SOd Made polyeste, boll color/- AT YOUR DEALER6-68-8 S125 9610-610-4 5150Pusher10-6$150 GRISH HN INDIANA 44373 hole pushrod through wing cut core cutting bow must done before sheeting Make root tip templates hole drilled desired location cut thin slot template just large enough cutting wire Pass hot wire down through slot around hole back out slot Another way cut channel saw Dremel tool Xacto knife using guide want eliminate bellcrank use flexible control rod cut slot curves back trailing edge large enough piece Nyrod Inset Ailerons method install hinge mount foam core prior sheeting First lay out aileron core fine tip marking pen Cut hard piece /s X lsa about /2 shorter aileron Lay place trace around marking pen Rout out slot fits flush glue place must flush foam because will sheet over Cut aileron out wing after sheeting number methods can used complete aileron re move sufficient material sheet ex posed foam edges Another remove sufficient material install concave-con vex mating hardwood aileron strips An other approach use rod through foam near leading edge aileron can used combination hinge control arm Applying Finishes Coatings After wing sheeted ready apply finish coating looks protection sheeting material fuel moisture etc easiest fastest coating Solarfilm Monokote etc Pre paration consists sanding balsa sheeting edges plywood card board sheeting plan cover unsheeted foam wings iron-on films sand put coat water-based paint insure smooth job Use extra care iron keeping moving avoid softening foam Preparation other finishes involves bit sanding balsa plywood ending about 320 wet-or-dry want higher quality finish can use almost type paint cover cardboard balsa plywood sheeting provided take certain pre cautions materials attack foam using airplane dope lacquer spray paints containing solvents etc following precautions must taken foam core may ruined First make sure cracks edges sealed Sec ond apply first two three coats very thin coatings allow dry thor oughly between coats doesnt mean just touch solvents soaked surface balsa cardboard plywood must have time com pletely evaporate before next coat Otherwise trapped solvents will soak through may attack foam core preferable apply primer coat material wont attack foam also compatible finish coats materials several light coats better heavy coat get hard smooth high gloss durable finish information presented series articles serious effort provide sufficient detail used described will enable enjoy ad vantages foam wing construction handy use may wish cut out text place folder FF Indoor/Tenny continued page 51 permitted times other open house activity Field Accessories inter esting things about attending indoor con tests note gadgets dreamed up fliers make easier handle fly models Winders torquemeters repair jigs rubber strippers etcall either necessary very desirableand demonstrating ingenuity models basic item run-down stand used hold assembled model whenever isnt being flown handiest right after flight since sup ports model prop free rotate allowing motor unwind run down other times model held safelyfar immune damage laid down Also run down stand allows close hands-off inspec tion permits minor repairs made using both hands repair photos show simplest elegant run-down stands simple small block plastic foam rubber slot top takes minutes build does good job holding model dowel rod stuck hole bottom white glue serves support other end rod can stuck weighted base clamped side model box foam rubber block somewhat bulky pack definitely fragile elegant stand designed orig inally Bill Hulbert shown photos constructed Stan Chilton works like clothespin except spring tension just enough hold model safely inner surface jaws covered plastic foam rubber cushion motor stick help hold securely No matter what run-down stand design must have important featureit must possible remove model safely hand rea son fliers wind rubber mo tors torque meter stooge broken motor inconvenience likely damage model motor breaks during winding model So flier must free wind motor hold end wound motor hand fetch model other hand Torque Meter serious indoor fli ers almost using torque meter anchor rubber motor winding advantages besides model safety does guess about energy stored motor wind-up can essentially identical previous knowing launch torque can avoid winding too much ceiling height flying conditions photos show Stan Chiltons torque meter dial March1978 99 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andresvs Aircraft Model Co Inc US Etc 1& North St Topsfjeld Mass 01983 887-8541 Price $3995 kit per dollar- bar em all
Edition: Model Aviation - 1978/03
Page Numbers: 42, 43, 44, 45, 46, 98, 99
Foam Techniques conclusion three-part coverage explains everything youll ever need know about skinning B Bill Evans Max Lester part 3 FAST CONSTRUCTION best reasons using Polystyrene foamcore wings Once techniques cutting cores described Parts II learned equally simple foam covering techniques can acquired almost before can sort out parts builtup wing techniques will made clear read background given enable get maximum advan tages foam avoiding pitfalls Properties Foam Reasons Covering Mechanical Damage Denting Foam relatively soft can permanently deformed easily harder materials same characteristic allows absorb shock better hard brittle material covering foam firmer material force spread over larger area shock absorbed foam protects foam denting firmer covering material break ing strength across grain Balsa has about 10 times compres sive strength l-pcf density beadhoard Bonding thin skin heavier higher strength materialsuch cardboard bal sa plywoodto foam significantly increases ability foam stand high wing loadings Similarly materials have much higher shear strength provides greater protection against breaking wing impact Chemical Damage Solvents The greatest chemical danger foam wings generally due use ad hesives containing solvents attack foam Some cannot used bond ing foam foam foam balsa other covering materials used sheet wings Others can used great care second frequent source chemical damage application paints finishes containing sol vents either directly foam semi-porous sheeting materials Another common source chemical damage foam fuels used model air craft engines cleaning materials used remove fuel addition covering materials pro tective coatings such epoxy paints ex cept solvent carrier like spray cans shellac water-based paints can used protect foam chemical damage Ultraviolet light particularly sunlight eventually damages foam Anything screens foam light way covering opaque coating materials will protect foam Effect Different Coverings Properties Skin Materials Shape The foam holds skin bonded shapes increases resistance bending same manner tube re sists bending compared flat sheet closer cross section approaches round tube greater resistance bending Effect Different Coverings erties Skin Materials General Tensile Strength grain psi psi psi psi psi Aircraft Plywood* 6300 8200 700 5500 1700 40-50 Balsa 100 2000 150 10 pcI Foam 21 20 pcI Styrofoam 70 symmetrical wing therefore stronger stance bending flat bottom serve several rength hardness edge strikes de strong bond utbor generally uses ver spruce may aircraft added also protection le strong 10 white glues strong epoxy has disadvantage being difficult sand partla stren tical also full high ui spar can y used against fligh line thc ovide st gear sary m spar acts sr strong two thirds chord depth cn cut table radial saw wing constant chord depth U may turned over inthe cut maintair h spar iieyTo lay out spar se forinto slot use marking guide Thi should cut just oul sanded block sand actly flush wino si liberally coated leading edge place full span spa strength March 1978 rs Plat ester r 44 Model uc w neral rule th glue sneets t width ol ther width slight excess g surface ssume top c desired edges toge eating straight edge eaa wirn wn e Titebond t fiat scr single edge raz ce weights nilow dry sand the joints move theta oat surfa side water-base use w position 1 cmi t firmly fo r rolling d iu side vhich ti side An pro wer l Put joint t Lir st wings iT panels slidi easuring rface witl fluE CT willi designs Completed wing panel skinne covered piece hat underside w Daded down center wit sure gri rom corner u can return t oId half c ild fairly smoothh will tend wi ily straight Un grain business c find can s iction lower re along grain witl rtunately muc s grain parallel side parallel longer cover g the Cardboard grain direci tional surface preparation cardboardwhich potential disaov readily shaped Si less plywood bals just cardboard ng characteristics Thickness should about heavier business cards match Right wing panel blo wood braces Applying 5-minute masks Choice fin 46 Model Aviation ting cards file folders fairly hard non ild long enough witn e grain cardboar panel splicing Grain Direction C tily parallel g s stiffer perpendicu1 edral joint center surfaces panels ji bottom Note placement ma re gullionsdepend needs tile] GRISH AIRCRAFT TYPE PROPELLERS Made hardwood fully carved true helical pitch airfoil ready sanding ALL SIZES INir$700 8 & 10 PITCH20800 RIGHT HAND221000 ROTATION241300 3/8 BORE AT YOuR DEALER USE TO PROPEL AIR CREATE THRUST AND BE PROPELLED BY AIR AT DISCRETION OF THE PURCHASER PROPELLERS ALL GRISH PROPELLERS ARE ENGINEERED TO TRUEHELICAL PITCH AND AIRFOIL FOR EFFICIENCY NEW COLOR. OLD PRICES 2 Blade Tractor 545/354-430d 636435 747-678SOd 84868-865d 949697 9-810-410-6 85d 11411-611-8 Si 12-412-512-6 8150 YELLOW propellers phasing out NATURAL WHITE phases Minor production savings help hold down prices Grish engineered airefficiency strength remain same either color ular site 150 put circle would have helped lot Oshkosh Nats 73 forced fly 150 runways center circle now called Pilots Circle still 5 radius big change next circle called Pitting Circle 15 radius rather 20 before out event has its own set circle radii form set Outer Circle event becomes Inner Circle another thus minimizing number circles have paint mark Racing events circle radii 5 15 48 58 68 76 Probably significant changes allow constant-diameter exhaust extension racing events ex cept Slow Rat use exhaust extension prohibited elim inates megaphones Goodyear should help event dont believe pipe really helps vast majority Goodyears theyre run anyhow True few really go worth nothing noise unre liability Good riddance Now lets see minipipe will help Running openface will bring some racers back Goodyear left noise megaphone scared off Another change going make lot people unhappy engine restric tion Slow Rat Basically change says engine must have produced 36 smaller significant parts have produced excludes head bolts needle valve venturi prop washer nut etc cludes complete crankcase including front end back end upper lower portion detachable split ex cluding ball bearings applicable engine crankshaft cylinder sleeve piston about rule will ap pear book What rule does say CLCB will have de fine what constitutes original manufacturer engine better yet what defines production engine look around at least couple sources what might call homebuilt engines use least few parts similar engine different manufacturer going legal illegal dont know sure would hate see small guy driven off rule Goodyear has couple important changes First hand-on-chest rule flying gone Second semi-final/final system also gone No longer fly 80-lap semi-finals take three best final race really would know best flight No now back 12 finals top runner turkey trot heat gets win everyone can go home grum ble Id just good heat Id have won Oh well cant win em Rat Race Slow Rat Race since tied together benefited change affects races well construction techniques final race Rat Slow Rat now has three pit stops 140 laps rather two previously What means race times next year will longer year about 10-15 sec onds Also dont have set up Rats differently now qualifying heats finals three stops 140-lap final race will four 35-lap segments rather three 47-lap pieces previously nice part qualifying heats two 35-lap seg ments can set up plane 35 laps per tank entire event rather have allow longer segments used have run Nelson Competition Products Just re ceived note Henry Nelson Nelson Competition Engines 729 Valemont Dr Verona PA 15147 current infor mation two real quality products produces FAI Team Race crowd Nelson 15D engine cast magnesium engine mounts Let quote little Henry st advertis ing has Metkmeijers fastest heat time British Nats leave catch boat didnt fly finals won Bo chum West Germany Utrecht Holland Just shows what really good team can dead stock engine Handy Hint friend friend piano tuner trade curse uses piano wire quite regularly made good suggestion tried make up next set control lines out piano wire sprinkle little talcum powder wire after roll lines onto reel keeps lines rust ing storage After unroll lines use wipe clean rag redust after roll back up W R Lee 3522 Tamarisk Lane Missouri City TX 77459 Foa rn/Evans/Lester continued page 46 piece hardwood landing gear block except should glued place until after wing halves have least trial joined insure proper align ment dihedral Ailerons design calls ailerons probably will using full length strip ailerons authors find Scotch similar tape makes neat dur able easy-to-install hinge controls attached same manner builtup wing sufficiently experienced building design in-set ailerons following suggestions may prove helpful techniques found successful foam wings Pushrods Through Wing way make 98 Model Aviation 3 ADE 5V3 2 Blade Pusher 5-4636-4 35d 8-685d 9-610-6 Si 3 Blade Tractor 5-36-36-4 SOd 3 Blade Pusher 6-3SOd Made polyeste, boll color/- AT YOUR DEALER6-68-8 S125 9610-610-4 5150Pusher10-6$150 GRISH HN INDIANA 44373 hole pushrod through wing cut core cutting bow must done before sheeting Make root tip templates hole drilled desired location cut thin slot template just large enough cutting wire Pass hot wire down through slot around hole back out slot Another way cut channel saw Dremel tool Xacto knife using guide want eliminate bellcrank use flexible control rod cut slot curves back trailing edge large enough piece Nyrod Inset Ailerons method install hinge mount foam core prior sheeting First lay out aileron core fine tip marking pen Cut hard piece /s X lsa about /2 shorter aileron Lay place trace around marking pen Rout out slot fits flush glue place must flush foam because will sheet over Cut aileron out wing after sheeting number methods can used complete aileron re move sufficient material sheet ex posed foam edges Another remove sufficient material install concave-con vex mating hardwood aileron strips An other approach use rod through foam near leading edge aileron can used combination hinge control arm Applying Finishes Coatings After wing sheeted ready apply finish coating looks protection sheeting material fuel moisture etc easiest fastest coating Solarfilm Monokote etc Pre paration consists sanding balsa sheeting edges plywood card board sheeting plan cover unsheeted foam wings iron-on films sand put coat water-based paint insure smooth job Use extra care iron keeping moving avoid softening foam Preparation other finishes involves bit sanding balsa plywood ending about 320 wet-or-dry want higher quality finish can use almost type paint cover cardboard balsa plywood sheeting provided take certain pre cautions materials attack foam using airplane dope lacquer spray paints containing solvents etc following precautions must taken foam core may ruined First make sure cracks edges sealed Sec ond apply first two three coats very thin coatings allow dry thor oughly between coats doesnt mean just touch solvents soaked surface balsa cardboard plywood must have time com pletely evaporate before next coat Otherwise trapped solvents will soak through may attack foam core preferable apply primer coat material wont attack foam also compatible finish coats materials several light coats better heavy coat get hard smooth high gloss durable finish information presented series articles serious effort provide sufficient detail used described will enable enjoy ad vantages foam wing construction handy use may wish cut out text place folder FF Indoor/Tenny continued page 51 permitted times other open house activity Field Accessories inter esting things about attending indoor con tests note gadgets dreamed up fliers make easier handle fly models Winders torquemeters repair jigs rubber strippers etcall either necessary very desirableand demonstrating ingenuity models basic item run-down stand used hold assembled model whenever isnt being flown handiest right after flight since sup ports model prop free rotate allowing motor unwind run down other times model held safelyfar immune damage laid down Also run down stand allows close hands-off inspec tion permits minor repairs made using both hands repair photos show simplest elegant run-down stands simple small block plastic foam rubber slot top takes minutes build does good job holding model dowel rod stuck hole bottom white glue serves support other end rod can stuck weighted base clamped side model box foam rubber block somewhat bulky pack definitely fragile elegant stand designed orig inally Bill Hulbert shown photos constructed Stan Chilton works like clothespin except spring tension just enough hold model safely inner surface jaws covered plastic foam rubber cushion motor stick help hold securely No matter what run-down stand design must have important featureit must possible remove model safely hand rea son fliers wind rubber mo tors torque meter stooge broken motor inconvenience likely damage model motor breaks during winding model So flier must free wind motor hold end wound motor hand fetch model other hand Torque Meter serious indoor fli ers almost using torque meter anchor rubber motor winding advantages besides model safety does guess about energy stored motor wind-up can essentially identical previous knowing launch torque can avoid winding too much ceiling height flying conditions photos show Stan Chiltons torque meter dial March1978 99 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andresvs Aircraft Model Co Inc US Etc 1& North St Topsfjeld Mass 01983 887-8541 Price $3995 kit per dollar- bar em all
Edition: Model Aviation - 1978/03
Page Numbers: 42, 43, 44, 45, 46, 98, 99
Foam Techniques conclusion three-part coverage explains everything youll ever need know about skinning B Bill Evans Max Lester part 3 FAST CONSTRUCTION best reasons using Polystyrene foamcore wings Once techniques cutting cores described Parts II learned equally simple foam covering techniques can acquired almost before can sort out parts builtup wing techniques will made clear read background given enable get maximum advan tages foam avoiding pitfalls Properties Foam Reasons Covering Mechanical Damage Denting Foam relatively soft can permanently deformed easily harder materials same characteristic allows absorb shock better hard brittle material covering foam firmer material force spread over larger area shock absorbed foam protects foam denting firmer covering material break ing strength across grain Balsa has about 10 times compres sive strength l-pcf density beadhoard Bonding thin skin heavier higher strength materialsuch cardboard bal sa plywoodto foam significantly increases ability foam stand high wing loadings Similarly materials have much higher shear strength provides greater protection against breaking wing impact Chemical Damage Solvents The greatest chemical danger foam wings generally due use ad hesives containing solvents attack foam Some cannot used bond ing foam foam foam balsa other covering materials used sheet wings Others can used great care second frequent source chemical damage application paints finishes containing sol vents either directly foam semi-porous sheeting materials Another common source chemical damage foam fuels used model air craft engines cleaning materials used remove fuel addition covering materials pro tective coatings such epoxy paints ex cept solvent carrier like spray cans shellac water-based paints can used protect foam chemical damage Ultraviolet light particularly sunlight eventually damages foam Anything screens foam light way covering opaque coating materials will protect foam Effect Different Coverings Properties Skin Materials Shape The foam holds skin bonded shapes increases resistance bending same manner tube re sists bending compared flat sheet closer cross section approaches round tube greater resistance bending Effect Different Coverings erties Skin Materials General Tensile Strength grain psi psi psi psi psi Aircraft Plywood* 6300 8200 700 5500 1700 40-50 Balsa 100 2000 150 10 pcI Foam 21 20 pcI Styrofoam 70 symmetrical wing therefore stronger stance bending flat bottom serve several rength hardness edge strikes de strong bond utbor generally uses ver spruce may aircraft added also protection le strong 10 white glues strong epoxy has disadvantage being difficult sand partla stren tical also full high ui spar can y used against fligh line thc ovide st gear sary m spar acts sr strong two thirds chord depth cn cut table radial saw wing constant chord depth U may turned over inthe cut maintair h spar iieyTo lay out spar se forinto slot use marking guide Thi should cut just oul sanded block sand actly flush wino si liberally coated leading edge place full span spa strength March 1978 rs Plat ester r 44 Model uc w neral rule th glue sneets t width ol ther width slight excess g surface ssume top c desired edges toge eating straight edge eaa wirn wn e Titebond t fiat scr single edge raz ce weights nilow dry sand the joints move theta oat surfa side water-base use w position 1 cmi t firmly fo r rolling d iu side vhich ti side An pro wer l Put joint t Lir st wings iT panels slidi easuring rface witl fluE CT willi designs Completed wing panel skinne covered piece hat underside w Daded down center wit sure gri rom corner u can return t oId half c ild fairly smoothh will tend wi ily straight Un grain business c find can s iction lower re along grain witl rtunately muc s grain parallel side parallel longer cover g the Cardboard grain direci tional surface preparation cardboardwhich potential disaov readily shaped Si less plywood bals just cardboard ng characteristics Thickness should about heavier business cards match Right wing panel blo wood braces Applying 5-minute masks Choice fin 46 Model Aviation ting cards file folders fairly hard non ild long enough witn e grain cardboar panel splicing Grain Direction C tily parallel g s stiffer perpendicu1 edral joint center surfaces panels ji bottom Note placement ma re gullionsdepend needs tile] GRISH AIRCRAFT TYPE PROPELLERS Made hardwood fully carved true helical pitch airfoil ready sanding ALL SIZES INir$700 8 & 10 PITCH20800 RIGHT HAND221000 ROTATION241300 3/8 BORE AT YOuR DEALER USE TO PROPEL AIR CREATE THRUST AND BE PROPELLED BY AIR AT DISCRETION OF THE PURCHASER PROPELLERS ALL GRISH PROPELLERS ARE ENGINEERED TO TRUEHELICAL PITCH AND AIRFOIL FOR EFFICIENCY NEW COLOR. OLD PRICES 2 Blade Tractor 545/354-430d 636435 747-678SOd 84868-865d 949697 9-810-410-6 85d 11411-611-8 Si 12-412-512-6 8150 YELLOW propellers phasing out NATURAL WHITE phases Minor production savings help hold down prices Grish engineered airefficiency strength remain same either color ular site 150 put circle would have helped lot Oshkosh Nats 73 forced fly 150 runways center circle now called Pilots Circle still 5 radius big change next circle called Pitting Circle 15 radius rather 20 before out event has its own set circle radii form set Outer Circle event becomes Inner Circle another thus minimizing number circles have paint mark Racing events circle radii 5 15 48 58 68 76 Probably significant changes allow constant-diameter exhaust extension racing events ex cept Slow Rat use exhaust extension prohibited elim inates megaphones Goodyear should help event dont believe pipe really helps vast majority Goodyears theyre run anyhow True few really go worth nothing noise unre liability Good riddance Now lets see minipipe will help Running openface will bring some racers back Goodyear left noise megaphone scared off Another change going make lot people unhappy engine restric tion Slow Rat Basically change says engine must have produced 36 smaller significant parts have produced excludes head bolts needle valve venturi prop washer nut etc cludes complete crankcase including front end back end upper lower portion detachable split ex cluding ball bearings applicable engine crankshaft cylinder sleeve piston about rule will ap pear book What rule does say CLCB will have de fine what constitutes original manufacturer engine better yet what defines production engine look around at least couple sources what might call homebuilt engines use least few parts similar engine different manufacturer going legal illegal dont know sure would hate see small guy driven off rule Goodyear has couple important changes First hand-on-chest rule flying gone Second semi-final/final system also gone No longer fly 80-lap semi-finals take three best final race really would know best flight No now back 12 finals top runner turkey trot heat gets win everyone can go home grum ble Id just good heat Id have won Oh well cant win em Rat Race Slow Rat Race since tied together benefited change affects races well construction techniques final race Rat Slow Rat now has three pit stops 140 laps rather two previously What means race times next year will longer year about 10-15 sec onds Also dont have set up Rats differently now qualifying heats finals three stops 140-lap final race will four 35-lap segments rather three 47-lap pieces previously nice part qualifying heats two 35-lap seg ments can set up plane 35 laps per tank entire event rather have allow longer segments used have run Nelson Competition Products Just re ceived note Henry Nelson Nelson Competition Engines 729 Valemont Dr Verona PA 15147 current infor mation two real quality products produces FAI Team Race crowd Nelson 15D engine cast magnesium engine mounts Let quote little Henry st advertis ing has Metkmeijers fastest heat time British Nats leave catch boat didnt fly finals won Bo chum West Germany Utrecht Holland Just shows what really good team can dead stock engine Handy Hint friend friend piano tuner trade curse uses piano wire quite regularly made good suggestion tried make up next set control lines out piano wire sprinkle little talcum powder wire after roll lines onto reel keeps lines rust ing storage After unroll lines use wipe clean rag redust after roll back up W R Lee 3522 Tamarisk Lane Missouri City TX 77459 Foa rn/Evans/Lester continued page 46 piece hardwood landing gear block except should glued place until after wing halves have least trial joined insure proper align ment dihedral Ailerons design calls ailerons probably will using full length strip ailerons authors find Scotch similar tape makes neat dur able easy-to-install hinge controls attached same manner builtup wing sufficiently experienced building design in-set ailerons following suggestions may prove helpful techniques found successful foam wings Pushrods Through Wing way make 98 Model Aviation 3 ADE 5V3 2 Blade Pusher 5-4636-4 35d 8-685d 9-610-6 Si 3 Blade Tractor 5-36-36-4 SOd 3 Blade Pusher 6-3SOd Made polyeste, boll color/- AT YOUR DEALER6-68-8 S125 9610-610-4 5150Pusher10-6$150 GRISH HN INDIANA 44373 hole pushrod through wing cut core cutting bow must done before sheeting Make root tip templates hole drilled desired location cut thin slot template just large enough cutting wire Pass hot wire down through slot around hole back out slot Another way cut channel saw Dremel tool Xacto knife using guide want eliminate bellcrank use flexible control rod cut slot curves back trailing edge large enough piece Nyrod Inset Ailerons method install hinge mount foam core prior sheeting First lay out aileron core fine tip marking pen Cut hard piece /s X lsa about /2 shorter aileron Lay place trace around marking pen Rout out slot fits flush glue place must flush foam because will sheet over Cut aileron out wing after sheeting number methods can used complete aileron re move sufficient material sheet ex posed foam edges Another remove sufficient material install concave-con vex mating hardwood aileron strips An other approach use rod through foam near leading edge aileron can used combination hinge control arm Applying Finishes Coatings After wing sheeted ready apply finish coating looks protection sheeting material fuel moisture etc easiest fastest coating Solarfilm Monokote etc Pre paration consists sanding balsa sheeting edges plywood card board sheeting plan cover unsheeted foam wings iron-on films sand put coat water-based paint insure smooth job Use extra care iron keeping moving avoid softening foam Preparation other finishes involves bit sanding balsa plywood ending about 320 wet-or-dry want higher quality finish can use almost type paint cover cardboard balsa plywood sheeting provided take certain pre cautions materials attack foam using airplane dope lacquer spray paints containing solvents etc following precautions must taken foam core may ruined First make sure cracks edges sealed Sec ond apply first two three coats very thin coatings allow dry thor oughly between coats doesnt mean just touch solvents soaked surface balsa cardboard plywood must have time com pletely evaporate before next coat Otherwise trapped solvents will soak through may attack foam core preferable apply primer coat material wont attack foam also compatible finish coats materials several light coats better heavy coat get hard smooth high gloss durable finish information presented series articles serious effort provide sufficient detail used described will enable enjoy ad vantages foam wing construction handy use may wish cut out text place folder FF Indoor/Tenny continued page 51 permitted times other open house activity Field Accessories inter esting things about attending indoor con tests note gadgets dreamed up fliers make easier handle fly models Winders torquemeters repair jigs rubber strippers etcall either necessary very desirableand demonstrating ingenuity models basic item run-down stand used hold assembled model whenever isnt being flown handiest right after flight since sup ports model prop free rotate allowing motor unwind run down other times model held safelyfar immune damage laid down Also run down stand allows close hands-off inspec tion permits minor repairs made using both hands repair photos show simplest elegant run-down stands simple small block plastic foam rubber slot top takes minutes build does good job holding model dowel rod stuck hole bottom white glue serves support other end rod can stuck weighted base clamped side model box foam rubber block somewhat bulky pack definitely fragile elegant stand designed orig inally Bill Hulbert shown photos constructed Stan Chilton works like clothespin except spring tension just enough hold model safely inner surface jaws covered plastic foam rubber cushion motor stick help hold securely No matter what run-down stand design must have important featureit must possible remove model safely hand rea son fliers wind rubber mo tors torque meter stooge broken motor inconvenience likely damage model motor breaks during winding model So flier must free wind motor hold end wound motor hand fetch model other hand Torque Meter serious indoor fli ers almost using torque meter anchor rubber motor winding advantages besides model safety does guess about energy stored motor wind-up can essentially identical previous knowing launch torque can avoid winding too much ceiling height flying conditions photos show Stan Chiltons torque meter dial March1978 99 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andresvs Aircraft Model Co Inc US Etc 1& North St Topsfjeld Mass 01983 887-8541 Price $3995 kit per dollar- bar em all
Edition: Model Aviation - 1978/03
Page Numbers: 42, 43, 44, 45, 46, 98, 99
Foam Techniques conclusion three-part coverage explains everything youll ever need know about skinning B Bill Evans Max Lester part 3 FAST CONSTRUCTION best reasons using Polystyrene foamcore wings Once techniques cutting cores described Parts II learned equally simple foam covering techniques can acquired almost before can sort out parts builtup wing techniques will made clear read background given enable get maximum advan tages foam avoiding pitfalls Properties Foam Reasons Covering Mechanical Damage Denting Foam relatively soft can permanently deformed easily harder materials same characteristic allows absorb shock better hard brittle material covering foam firmer material force spread over larger area shock absorbed foam protects foam denting firmer covering material break ing strength across grain Balsa has about 10 times compres sive strength l-pcf density beadhoard Bonding thin skin heavier higher strength materialsuch cardboard bal sa plywoodto foam significantly increases ability foam stand high wing loadings Similarly materials have much higher shear strength provides greater protection against breaking wing impact Chemical Damage Solvents The greatest chemical danger foam wings generally due use ad hesives containing solvents attack foam Some cannot used bond ing foam foam foam balsa other covering materials used sheet wings Others can used great care second frequent source chemical damage application paints finishes containing sol vents either directly foam semi-porous sheeting materials Another common source chemical damage foam fuels used model air craft engines cleaning materials used remove fuel addition covering materials pro tective coatings such epoxy paints ex cept solvent carrier like spray cans shellac water-based paints can used protect foam chemical damage Ultraviolet light particularly sunlight eventually damages foam Anything screens foam light way covering opaque coating materials will protect foam Effect Different Coverings Properties Skin Materials Shape The foam holds skin bonded shapes increases resistance bending same manner tube re sists bending compared flat sheet closer cross section approaches round tube greater resistance bending Effect Different Coverings erties Skin Materials General Tensile Strength grain psi psi psi psi psi Aircraft Plywood* 6300 8200 700 5500 1700 40-50 Balsa 100 2000 150 10 pcI Foam 21 20 pcI Styrofoam 70 symmetrical wing therefore stronger stance bending flat bottom serve several rength hardness edge strikes de strong bond utbor generally uses ver spruce may aircraft added also protection le strong 10 white glues strong epoxy has disadvantage being difficult sand partla stren tical also full high ui spar can y used against fligh line thc ovide st gear sary m spar acts sr strong two thirds chord depth cn cut table radial saw wing constant chord depth U may turned over inthe cut maintair h spar iieyTo lay out spar se forinto slot use marking guide Thi should cut just oul sanded block sand actly flush wino si liberally coated leading edge place full span spa strength March 1978 rs Plat ester r 44 Model uc w neral rule th glue sneets t width ol ther width slight excess g surface ssume top c desired edges toge eating straight edge eaa wirn wn e Titebond t fiat scr single edge raz ce weights nilow dry sand the joints move theta oat surfa side water-base use w position 1 cmi t firmly fo r rolling d iu side vhich ti side An pro wer l Put joint t Lir st wings iT panels slidi easuring rface witl fluE CT willi designs Completed wing panel skinne covered piece hat underside w Daded down center wit sure gri rom corner u can return t oId half c ild fairly smoothh will tend wi ily straight Un grain business c find can s iction lower re along grain witl rtunately muc s grain parallel side parallel longer cover g the Cardboard grain direci tional surface preparation cardboardwhich potential disaov readily shaped Si less plywood bals just cardboard ng characteristics Thickness should about heavier business cards match Right wing panel blo wood braces Applying 5-minute masks Choice fin 46 Model Aviation ting cards file folders fairly hard non ild long enough witn e grain cardboar panel splicing Grain Direction C tily parallel g s stiffer perpendicu1 edral joint center surfaces panels ji bottom Note placement ma re gullionsdepend needs tile] GRISH AIRCRAFT TYPE PROPELLERS Made hardwood fully carved true helical pitch airfoil ready sanding ALL SIZES INir$700 8 & 10 PITCH20800 RIGHT HAND221000 ROTATION241300 3/8 BORE AT YOuR DEALER USE TO PROPEL AIR CREATE THRUST AND BE PROPELLED BY AIR AT DISCRETION OF THE PURCHASER PROPELLERS ALL GRISH PROPELLERS ARE ENGINEERED TO TRUEHELICAL PITCH AND AIRFOIL FOR EFFICIENCY NEW COLOR. OLD PRICES 2 Blade Tractor 545/354-430d 636435 747-678SOd 84868-865d 949697 9-810-410-6 85d 11411-611-8 Si 12-412-512-6 8150 YELLOW propellers phasing out NATURAL WHITE phases Minor production savings help hold down prices Grish engineered airefficiency strength remain same either color ular site 150 put circle would have helped lot Oshkosh Nats 73 forced fly 150 runways center circle now called Pilots Circle still 5 radius big change next circle called Pitting Circle 15 radius rather 20 before out event has its own set circle radii form set Outer Circle event becomes Inner Circle another thus minimizing number circles have paint mark Racing events circle radii 5 15 48 58 68 76 Probably significant changes allow constant-diameter exhaust extension racing events ex cept Slow Rat use exhaust extension prohibited elim inates megaphones Goodyear should help event dont believe pipe really helps vast majority Goodyears theyre run anyhow True few really go worth nothing noise unre liability Good riddance Now lets see minipipe will help Running openface will bring some racers back Goodyear left noise megaphone scared off Another change going make lot people unhappy engine restric tion Slow Rat Basically change says engine must have produced 36 smaller significant parts have produced excludes head bolts needle valve venturi prop washer nut etc cludes complete crankcase including front end back end upper lower portion detachable split ex cluding ball bearings applicable engine crankshaft cylinder sleeve piston about rule will ap pear book What rule does say CLCB will have de fine what constitutes original manufacturer engine better yet what defines production engine look around at least couple sources what might call homebuilt engines use least few parts similar engine different manufacturer going legal illegal dont know sure would hate see small guy driven off rule Goodyear has couple important changes First hand-on-chest rule flying gone Second semi-final/final system also gone No longer fly 80-lap semi-finals take three best final race really would know best flight No now back 12 finals top runner turkey trot heat gets win everyone can go home grum ble Id just good heat Id have won Oh well cant win em Rat Race Slow Rat Race since tied together benefited change affects races well construction techniques final race Rat Slow Rat now has three pit stops 140 laps rather two previously What means race times next year will longer year about 10-15 sec onds Also dont have set up Rats differently now qualifying heats finals three stops 140-lap final race will four 35-lap segments rather three 47-lap pieces previously nice part qualifying heats two 35-lap seg ments can set up plane 35 laps per tank entire event rather have allow longer segments used have run Nelson Competition Products Just re ceived note Henry Nelson Nelson Competition Engines 729 Valemont Dr Verona PA 15147 current infor mation two real quality products produces FAI Team Race crowd Nelson 15D engine cast magnesium engine mounts Let quote little Henry st advertis ing has Metkmeijers fastest heat time British Nats leave catch boat didnt fly finals won Bo chum West Germany Utrecht Holland Just shows what really good team can dead stock engine Handy Hint friend friend piano tuner trade curse uses piano wire quite regularly made good suggestion tried make up next set control lines out piano wire sprinkle little talcum powder wire after roll lines onto reel keeps lines rust ing storage After unroll lines use wipe clean rag redust after roll back up W R Lee 3522 Tamarisk Lane Missouri City TX 77459 Foa rn/Evans/Lester continued page 46 piece hardwood landing gear block except should glued place until after wing halves have least trial joined insure proper align ment dihedral Ailerons design calls ailerons probably will using full length strip ailerons authors find Scotch similar tape makes neat dur able easy-to-install hinge controls attached same manner builtup wing sufficiently experienced building design in-set ailerons following suggestions may prove helpful techniques found successful foam wings Pushrods Through Wing way make 98 Model Aviation 3 ADE 5V3 2 Blade Pusher 5-4636-4 35d 8-685d 9-610-6 Si 3 Blade Tractor 5-36-36-4 SOd 3 Blade Pusher 6-3SOd Made polyeste, boll color/- AT YOUR DEALER6-68-8 S125 9610-610-4 5150Pusher10-6$150 GRISH HN INDIANA 44373 hole pushrod through wing cut core cutting bow must done before sheeting Make root tip templates hole drilled desired location cut thin slot template just large enough cutting wire Pass hot wire down through slot around hole back out slot Another way cut channel saw Dremel tool Xacto knife using guide want eliminate bellcrank use flexible control rod cut slot curves back trailing edge large enough piece Nyrod Inset Ailerons method install hinge mount foam core prior sheeting First lay out aileron core fine tip marking pen Cut hard piece /s X lsa about /2 shorter aileron Lay place trace around marking pen Rout out slot fits flush glue place must flush foam because will sheet over Cut aileron out wing after sheeting number methods can used complete aileron re move sufficient material sheet ex posed foam edges Another remove sufficient material install concave-con vex mating hardwood aileron strips An other approach use rod through foam near leading edge aileron can used combination hinge control arm Applying Finishes Coatings After wing sheeted ready apply finish coating looks protection sheeting material fuel moisture etc easiest fastest coating Solarfilm Monokote etc Pre paration consists sanding balsa sheeting edges plywood card board sheeting plan cover unsheeted foam wings iron-on films sand put coat water-based paint insure smooth job Use extra care iron keeping moving avoid softening foam Preparation other finishes involves bit sanding balsa plywood ending about 320 wet-or-dry want higher quality finish can use almost type paint cover cardboard balsa plywood sheeting provided take certain pre cautions materials attack foam using airplane dope lacquer spray paints containing solvents etc following precautions must taken foam core may ruined First make sure cracks edges sealed Sec ond apply first two three coats very thin coatings allow dry thor oughly between coats doesnt mean just touch solvents soaked surface balsa cardboard plywood must have time com pletely evaporate before next coat Otherwise trapped solvents will soak through may attack foam core preferable apply primer coat material wont attack foam also compatible finish coats materials several light coats better heavy coat get hard smooth high gloss durable finish information presented series articles serious effort provide sufficient detail used described will enable enjoy ad vantages foam wing construction handy use may wish cut out text place folder FF Indoor/Tenny continued page 51 permitted times other open house activity Field Accessories inter esting things about attending indoor con tests note gadgets dreamed up fliers make easier handle fly models Winders torquemeters repair jigs rubber strippers etcall either necessary very desirableand demonstrating ingenuity models basic item run-down stand used hold assembled model whenever isnt being flown handiest right after flight since sup ports model prop free rotate allowing motor unwind run down other times model held safelyfar immune damage laid down Also run down stand allows close hands-off inspec tion permits minor repairs made using both hands repair photos show simplest elegant run-down stands simple small block plastic foam rubber slot top takes minutes build does good job holding model dowel rod stuck hole bottom white glue serves support other end rod can stuck weighted base clamped side model box foam rubber block somewhat bulky pack definitely fragile elegant stand designed orig inally Bill Hulbert shown photos constructed Stan Chilton works like clothespin except spring tension just enough hold model safely inner surface jaws covered plastic foam rubber cushion motor stick help hold securely No matter what run-down stand design must have important featureit must possible remove model safely hand rea son fliers wind rubber mo tors torque meter stooge broken motor inconvenience likely damage model motor breaks during winding model So flier must free wind motor hold end wound motor hand fetch model other hand Torque Meter serious indoor fli ers almost using torque meter anchor rubber motor winding advantages besides model safety does guess about energy stored motor wind-up can essentially identical previous knowing launch torque can avoid winding too much ceiling height flying conditions photos show Stan Chiltons torque meter dial March1978 99 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andresvs Aircraft Model Co Inc US Etc 1& North St Topsfjeld Mass 01983 887-8541 Price $3995 kit per dollar- bar em all