LAST month column mentioned some contrasts models used top contenders sailplane world championships last summer highly technical precision approach Austrian German Swiss teams construction models highly contrasted South African U SA teams andtheir straight-forward approach saw store bought models hobby shop materials fliers other countries models fell between limits Deckers highly complex gadgetry design Spavins built week model could labeled kitable obvious in-be tween models time spent construction air Yet showed innovativeness lack practice pre vented better showing builders month well pass some ideas flying techniques whether youre weekend flier contest pro something Wing Spars South Africans some Denmarks team used box-spar construction spruce plywood Full-depth vertical web bing glued between spruce faced plywood case South African birds plywood carried out polyhedral break Danes design straight wing D tube principle plywood carried out full span spar construction strong evidenced South Africans launching technique 12volt winch operated almost constant speed idea build up much flying speed possible top launch release just precise moment burn off ex cess flying speed climbing thereby getting higher launch height winch provided wont discuss height advantage point over pulse/kite method point wings took tremendous strain once did come apart Terry Koplan Steve Work USA replaced spars planes spars carbon fiber glued during wing construction slow-curing epoxy its least reason Terry able carry 60 ounces ballast during windy gusty 12-lap distance run Controls Many glass-covered foam wings included ailerons Most operated directly through torque tubes thereby eliminating loose linkage problems Swiss same Danish team members boxspar-constructed wings straight wings instead ailerons pivoting wings wings pivoted main support rod changed angle attack effect roll lateral movement bellcranks drove wings custom-made take high drive loads support loads during launch ing highspeed turns As spoilers very few foam/glass wings big reason besides installation problem purists built wings within 1/100 millimeter accuracy wouldnt think putting hairline crack top wing As Al Doig says Spoilers de vices reduce lift openedand closed Instead spoilers Olympic II fliers know glass/foam boys used either pop-up canopies trailing edge flap/ airbrake method used Holland German fliers latter systems operated simple torque drive out fuselage wing fairing wing root trailing edge excep tion Dave Worral British team used new approach spoilers Continued page 113 30 Model Aviation Mechanism pivoting wing system Gunnar Hansens Unica Assemblies pivot shaft supported through ball bearings Attached assemblies wing support rods Hansen member Danish team placed eight World Championships Peter Gerber Switzerland Capilla glass fuselage balsa covered wings sleek ship has three control functions rudder elevator movable pivoting wings Modular air brake used Dave Worralwho took seventh last World Champsis shown open position picture Diagram illustrates module fits between two wing ribsalso blades extended cable operation Number modules can varied flier pipes will lead exit fuselage bottom vibration level very low order get sufficient flywheel mass smootlmess long belt life reduce overall length unit flywheel has its outer periphery grooved second wheel meshes Participants urged bring unfinished pro jects Scale Rally several appeared enterprise three Flying Dutchmen Club members 8-engine Hughes Spruce Goose flying boat 16-foot span Power will eight 0S 25 engines projected weight 40 pounds Foam wings covered 1/16 hardwood veneer Fuselage balsa Skip Mast displayed unfinished Lockheed cules Cl 30 will use four K&B 35 engines Construction balsa foam fuselage wings Information Source Leo J Kohn old time modeler aviation writer historian photog rapher has wealth information 45000 plane photos available reasonable prices scale modelers search documenta tion photos 2 X 4W size arranged packs varying quantity few several dozen per pack average price per photo 24 less would cost take own can find plane can get As example Douglas DC-3 photos can 23 different packs arranged ac cording airline additional four packs C-47 military version Some DC-3 packs have few four photos United Air line pack contains abundant 48 actual black white photos made negatives maximum detail list includes military rac ing antique airline business rotorcraft home built aerobatic sailplane classic foreign pre-1920 WW maintains large com prehensive data bank can supply informa tion details almost aircraft Being constant contact modelers search ing documentation color markings Leo gets numerous requests actual color photos WW 1920 era aircraft says modelers must depend black white photos taken state-of-the-art coexisted airplane point possible very least intensely interesting track down correct color schemes other information Color photos available various antique other aircraft types taken EAA other fly-ins usually involves two basic type everybody ends up mod eling same plane Leo also offers scale documentation service will research airplane provide copies whatever information drawings tech nical details color schemes etc can found has backlog such requests generated word among modelers fullsize aircraft restorers well has about 500 color photos feels modelers satisfied easily available color documentation denying themselves great educational opportunity such inherent part Scale hobby Leos service called Collect-Air Photos PO Box 14234 Milwaukee WI 53214 asking data CORRECTION article Cabin Fever December issue editors note stated Walt used 23%- pitch prop 130 winder turns 16-1 turns 085 FAI rubber should have read Walt used 12-in diameter prop 22-inch pitch flew 23% loop 085 FAI rubber 130 winder turns r RADIO SERVICE Futaba IRADIO SOUTH Pro Line provide fast economical in-house service Futaba Kraft Pro Line radios list satisfied Customers reads like Whos R/C competition Call Steve Helms discuss problems having present equipment AT RADIO SOUTH customer satisfaction isnt just motto Its way life Sales gines & parts Power fuel Pro-Prop 1925 East Creighton Rd acola FL 32504 478-6745 IIIISWI NUT INDI9K little piece electronic wizardry quickly easily reverses direction servo travel plugged between receiver servo will work iith positive pulse servos three four wire Connectors NOT furnished _______Available unassembled kit form assembled tested 14K104Ace Servo Reverser kit $795 14K104CAce Servo Reverser assy $1150 details send $1 latest catalog Add $50 1st Class return $1 hand ling direct orders 816 584-7121 catalog include stamp reply postage Color photography became practical late 1 930s no reasonable perma nence color image until after WW II planes built before 1945 color documenta tion will need something other photo such written description Profile Publication becoming rare authentic color chips Un less color photos carefully made seldom agree actual paint samples fore useful documentation would appear AMA rules state proof may photographs drawings written references However must agreed color photo will likely have psychological advantage doubt could cast upon authenticity other kinds proof contemporary subjects irrefutable proof photo model posed prototype color patches verified aircraft owner Finding documentation finish color markings difficult tasks facing modeler chooses obscure subjects Proof accounts 16% static score Precision Scale much greater 30% Sport Scale International Stand-off Scale meet Woodvale surprising number documentations found de ficient area Judges becoming AF E/, In7] BOX SuE HIGGINSVILLE MO 64037 insistent proof furnished will likely influence choice prototype Bob Dolly Wischer RL 1 S-221 Lapham Peak Road Delafield WI 53018 RC Soaring/Pruss continued page 30 defied slick wing purists Dave used set modular air brakes labeled just manufactured same British company produces popular captured towhook Worrals installation neatly done Dassel-like wing though modules designed built-up wing modules designed placed between two-inch rib spacing absolute minimum amount wing alterating What makes neat installa tion module has pivoting blade similar semaphore signal blade designed overlap next module giving system very clean assembly closed Nearly fliers built-up wings used conventional hinge-type spoilers Exception Steve Works Bird Time no spoilers Towhooks Towhooks ranged January1980 113 Go GRISH propeller True helical pitch airfoil win-power 2 Blade Tractor 53each 545354g 63 64Nc 7476 78Nc 8486 88Uc 9496 97 9810-4106Sc 114116118 *1 12412-512-6iUD 2 Blade Pusher 5- 3 5-46-36-4USc 86USc 9610-6*1 3 Blade Tractor 53 6364 HOc 3 Blade Pusher 63USC Metallic Aluminum Color Tractor 168 $1 8688ia 96 106104iUS Pusher106*1U Grumman Guardian XTB3F-28 /\ Class Carrier ICLD-102 IBy I{CataIog25cRog Edwards ERNISTIC MODELS PO BOX 6974 ALBUQ NM 87197 sophisticated simplest Deckers custom-designed built out titanium Na turally Roy Spavins contribution other end towhook wizardry name hardware dealer bought cup hooks Both Austrians hand-towed South Africans winched used simple straight less thing go wrong hooks USA team captured releaseable types Skip used Radio Sailplane type mounted standard fashion Steve used same type mounted up inside fuselage reduce drag Terry used Rocket City towhook installations required different type towring two custommade Sean Bannister England team similar situation towhooks produced simple effective solution tow ring club confivnted problem having correct towring available hook might screwed too close fuselage ring gets ruptured time ole Luke Leadfoot launches 16-foot Behe moth 2000 take lesson English cousins Sean fashioned end pennant withinstead towringan 18-inch nylon coated steel cable fastened ends form loop flexible loop could simply hooked standard towhook could pinched together inserted hidden type hook such Rocket City type So can see exotic materials tolerances second lens polishing won some workshop materials stralght forward building did job others Sunday fliers contest goers can leam something both schools Yet FAI F3B flier work still cut out Whatever design build remember statistics show knew models GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 208 22 10 24 13 RIGHT HAND TRACTOR 6 RISK BROS INDIANA 46373 AEROBATIC AIRPLANES BY RCBT C MORPISON UPERB DRAWINGS S395 PLUS 5O P 0T L2L2.l bestno matter what design favorstood winners circle Dan Pruss Rt 2 Box 490 Pla infield IL 60544 RC Aerobatics/Van Putte continued page 3 airplane ground quickly could Such events plane breakers should avoided have some good ideas Fun Fly events let hear about can share others read ModelAviation second topic common among newsletters instructor problem club has good supply qualified instructors consider yourself lucky lot clubs arent fortunate clubs have two overworked instructors dont have time fly own airplanes sport virtually requires instructor give beginner reasonable chance learning fly breaking lot airplanes other sports way acceptable level competence can developed numerous sports just participating sport course participant usually gets better faster instruc tion instruction isnt necessary flying radio-controlled airplanes beginner can select build fly first RC airplane successfully help rare usually brag about guy good instructors such short supply anything can done improve situation answer depends makeup club attitude club has toward beginners Usually people club instructors fit two general categories first instructor extrovert seeks out beginners offers teach fly second type basically introvert flies airplanes well beginners often ask him help leam fly little needs done develop first type instructors selfstarters already instructors anyway However beginners reluctant approach second type instructor attitude club toward beginners important club attitude positive usually active effort part club officers members get beginners together instructors Clubs proper attitude toward beginners usually dont have instructor prob lem So theres instructor problem club pass favor instructor did Get some beginners touch competent reticent good fliers would fine instructors someone just asked great things about receiving club newsletters opportunity read humorous items contain sample some humor following short article Don Tankersley Birmingham K/C News Much Does Airplane Weigh times desirable know much latest creation weighs finding suitable balance can problem Bathroom scales crude hauling plane down market weigh check-out scales attracts lot attention method can used print name address zip code along words First Class wing drop mail plane delivered allow six weeks simply divide postage due $160 determine weight pounds method has certain drawbacks however occa sionally over-zealous postmaster will send plane Air Mail allow eight weeks deliv ery case answer obtained will incorrect Also plane may sustain some damage passing through cancellation sorting machines product review product review product review Axiflo Ducted Fan RK-206 isa maior improve ment Midwest series ducted fan designed around powerful 20-sized engines such K&B 35 cc need assemble RK-20B Midwest claims can done hour fan consists five major pieces Tough ABS plastic nylon glassreinforced nylon used form fan Axiflo Ducted Fan RK20B comes com plete hardware instruction booklet fullsize plans Midwest claims 4 pounds thrust ducted fan fan also includes integral 41/z-oz fuel tank features new system fuel line connections product review product review product review 114 Model Aviation forfldidO PROPELLERS Madeof polyester donotboil orcolor Sizes pitches styles needs AT YOUR DEALER 3 3lade NEW SIZE IN 8 & 10 PITCH 26 $16 Axiflo Ducted Fan Midwest Products Inc. 400 South Indiana St. Hobart IN 46342
Edition: Model Aviation - 1980/01
Page Numbers: 30, 113, 114
LAST month column mentioned some contrasts models used top contenders sailplane world championships last summer highly technical precision approach Austrian German Swiss teams construction models highly contrasted South African U SA teams andtheir straight-forward approach saw store bought models hobby shop materials fliers other countries models fell between limits Deckers highly complex gadgetry design Spavins built week model could labeled kitable obvious in-be tween models time spent construction air Yet showed innovativeness lack practice pre vented better showing builders month well pass some ideas flying techniques whether youre weekend flier contest pro something Wing Spars South Africans some Denmarks team used box-spar construction spruce plywood Full-depth vertical web bing glued between spruce faced plywood case South African birds plywood carried out polyhedral break Danes design straight wing D tube principle plywood carried out full span spar construction strong evidenced South Africans launching technique 12volt winch operated almost constant speed idea build up much flying speed possible top launch release just precise moment burn off ex cess flying speed climbing thereby getting higher launch height winch provided wont discuss height advantage point over pulse/kite method point wings took tremendous strain once did come apart Terry Koplan Steve Work USA replaced spars planes spars carbon fiber glued during wing construction slow-curing epoxy its least reason Terry able carry 60 ounces ballast during windy gusty 12-lap distance run Controls Many glass-covered foam wings included ailerons Most operated directly through torque tubes thereby eliminating loose linkage problems Swiss same Danish team members boxspar-constructed wings straight wings instead ailerons pivoting wings wings pivoted main support rod changed angle attack effect roll lateral movement bellcranks drove wings custom-made take high drive loads support loads during launch ing highspeed turns As spoilers very few foam/glass wings big reason besides installation problem purists built wings within 1/100 millimeter accuracy wouldnt think putting hairline crack top wing As Al Doig says Spoilers de vices reduce lift openedand closed Instead spoilers Olympic II fliers know glass/foam boys used either pop-up canopies trailing edge flap/ airbrake method used Holland German fliers latter systems operated simple torque drive out fuselage wing fairing wing root trailing edge excep tion Dave Worral British team used new approach spoilers Continued page 113 30 Model Aviation Mechanism pivoting wing system Gunnar Hansens Unica Assemblies pivot shaft supported through ball bearings Attached assemblies wing support rods Hansen member Danish team placed eight World Championships Peter Gerber Switzerland Capilla glass fuselage balsa covered wings sleek ship has three control functions rudder elevator movable pivoting wings Modular air brake used Dave Worralwho took seventh last World Champsis shown open position picture Diagram illustrates module fits between two wing ribsalso blades extended cable operation Number modules can varied flier pipes will lead exit fuselage bottom vibration level very low order get sufficient flywheel mass smootlmess long belt life reduce overall length unit flywheel has its outer periphery grooved second wheel meshes Participants urged bring unfinished pro jects Scale Rally several appeared enterprise three Flying Dutchmen Club members 8-engine Hughes Spruce Goose flying boat 16-foot span Power will eight 0S 25 engines projected weight 40 pounds Foam wings covered 1/16 hardwood veneer Fuselage balsa Skip Mast displayed unfinished Lockheed cules Cl 30 will use four K&B 35 engines Construction balsa foam fuselage wings Information Source Leo J Kohn old time modeler aviation writer historian photog rapher has wealth information 45000 plane photos available reasonable prices scale modelers search documenta tion photos 2 X 4W size arranged packs varying quantity few several dozen per pack average price per photo 24 less would cost take own can find plane can get As example Douglas DC-3 photos can 23 different packs arranged ac cording airline additional four packs C-47 military version Some DC-3 packs have few four photos United Air line pack contains abundant 48 actual black white photos made negatives maximum detail list includes military rac ing antique airline business rotorcraft home built aerobatic sailplane classic foreign pre-1920 WW maintains large com prehensive data bank can supply informa tion details almost aircraft Being constant contact modelers search ing documentation color markings Leo gets numerous requests actual color photos WW 1920 era aircraft says modelers must depend black white photos taken state-of-the-art coexisted airplane point possible very least intensely interesting track down correct color schemes other information Color photos available various antique other aircraft types taken EAA other fly-ins usually involves two basic type everybody ends up mod eling same plane Leo also offers scale documentation service will research airplane provide copies whatever information drawings tech nical details color schemes etc can found has backlog such requests generated word among modelers fullsize aircraft restorers well has about 500 color photos feels modelers satisfied easily available color documentation denying themselves great educational opportunity such inherent part Scale hobby Leos service called Collect-Air Photos PO Box 14234 Milwaukee WI 53214 asking data CORRECTION article Cabin Fever December issue editors note stated Walt used 23%- pitch prop 130 winder turns 16-1 turns 085 FAI rubber should have read Walt used 12-in diameter prop 22-inch pitch flew 23% loop 085 FAI rubber 130 winder turns r RADIO SERVICE Futaba IRADIO SOUTH Pro Line provide fast economical in-house service Futaba Kraft Pro Line radios list satisfied Customers reads like Whos R/C competition Call Steve Helms discuss problems having present equipment AT RADIO SOUTH customer satisfaction isnt just motto Its way life Sales gines & parts Power fuel Pro-Prop 1925 East Creighton Rd acola FL 32504 478-6745 IIIISWI NUT INDI9K little piece electronic wizardry quickly easily reverses direction servo travel plugged between receiver servo will work iith positive pulse servos three four wire Connectors NOT furnished _______Available unassembled kit form assembled tested 14K104Ace Servo Reverser kit $795 14K104CAce Servo Reverser assy $1150 details send $1 latest catalog Add $50 1st Class return $1 hand ling direct orders 816 584-7121 catalog include stamp reply postage Color photography became practical late 1 930s no reasonable perma nence color image until after WW II planes built before 1945 color documenta tion will need something other photo such written description Profile Publication becoming rare authentic color chips Un less color photos carefully made seldom agree actual paint samples fore useful documentation would appear AMA rules state proof may photographs drawings written references However must agreed color photo will likely have psychological advantage doubt could cast upon authenticity other kinds proof contemporary subjects irrefutable proof photo model posed prototype color patches verified aircraft owner Finding documentation finish color markings difficult tasks facing modeler chooses obscure subjects Proof accounts 16% static score Precision Scale much greater 30% Sport Scale International Stand-off Scale meet Woodvale surprising number documentations found de ficient area Judges becoming AF E/, In7] BOX SuE HIGGINSVILLE MO 64037 insistent proof furnished will likely influence choice prototype Bob Dolly Wischer RL 1 S-221 Lapham Peak Road Delafield WI 53018 RC Soaring/Pruss continued page 30 defied slick wing purists Dave used set modular air brakes labeled just manufactured same British company produces popular captured towhook Worrals installation neatly done Dassel-like wing though modules designed built-up wing modules designed placed between two-inch rib spacing absolute minimum amount wing alterating What makes neat installa tion module has pivoting blade similar semaphore signal blade designed overlap next module giving system very clean assembly closed Nearly fliers built-up wings used conventional hinge-type spoilers Exception Steve Works Bird Time no spoilers Towhooks Towhooks ranged January1980 113 Go GRISH propeller True helical pitch airfoil win-power 2 Blade Tractor 53each 545354g 63 64Nc 7476 78Nc 8486 88Uc 9496 97 9810-4106Sc 114116118 *1 12412-512-6iUD 2 Blade Pusher 5- 3 5-46-36-4USc 86USc 9610-6*1 3 Blade Tractor 53 6364 HOc 3 Blade Pusher 63USC Metallic Aluminum Color Tractor 168 $1 8688ia 96 106104iUS Pusher106*1U Grumman Guardian XTB3F-28 /\ Class Carrier ICLD-102 IBy I{CataIog25cRog Edwards ERNISTIC MODELS PO BOX 6974 ALBUQ NM 87197 sophisticated simplest Deckers custom-designed built out titanium Na turally Roy Spavins contribution other end towhook wizardry name hardware dealer bought cup hooks Both Austrians hand-towed South Africans winched used simple straight less thing go wrong hooks USA team captured releaseable types Skip used Radio Sailplane type mounted standard fashion Steve used same type mounted up inside fuselage reduce drag Terry used Rocket City towhook installations required different type towring two custommade Sean Bannister England team similar situation towhooks produced simple effective solution tow ring club confivnted problem having correct towring available hook might screwed too close fuselage ring gets ruptured time ole Luke Leadfoot launches 16-foot Behe moth 2000 take lesson English cousins Sean fashioned end pennant withinstead towringan 18-inch nylon coated steel cable fastened ends form loop flexible loop could simply hooked standard towhook could pinched together inserted hidden type hook such Rocket City type So can see exotic materials tolerances second lens polishing won some workshop materials stralght forward building did job others Sunday fliers contest goers can leam something both schools Yet FAI F3B flier work still cut out Whatever design build remember statistics show knew models GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 208 22 10 24 13 RIGHT HAND TRACTOR 6 RISK BROS INDIANA 46373 AEROBATIC AIRPLANES BY RCBT C MORPISON UPERB DRAWINGS S395 PLUS 5O P 0T L2L2.l bestno matter what design favorstood winners circle Dan Pruss Rt 2 Box 490 Pla infield IL 60544 RC Aerobatics/Van Putte continued page 3 airplane ground quickly could Such events plane breakers should avoided have some good ideas Fun Fly events let hear about can share others read ModelAviation second topic common among newsletters instructor problem club has good supply qualified instructors consider yourself lucky lot clubs arent fortunate clubs have two overworked instructors dont have time fly own airplanes sport virtually requires instructor give beginner reasonable chance learning fly breaking lot airplanes other sports way acceptable level competence can developed numerous sports just participating sport course participant usually gets better faster instruc tion instruction isnt necessary flying radio-controlled airplanes beginner can select build fly first RC airplane successfully help rare usually brag about guy good instructors such short supply anything can done improve situation answer depends makeup club attitude club has toward beginners Usually people club instructors fit two general categories first instructor extrovert seeks out beginners offers teach fly second type basically introvert flies airplanes well beginners often ask him help leam fly little needs done develop first type instructors selfstarters already instructors anyway However beginners reluctant approach second type instructor attitude club toward beginners important club attitude positive usually active effort part club officers members get beginners together instructors Clubs proper attitude toward beginners usually dont have instructor prob lem So theres instructor problem club pass favor instructor did Get some beginners touch competent reticent good fliers would fine instructors someone just asked great things about receiving club newsletters opportunity read humorous items contain sample some humor following short article Don Tankersley Birmingham K/C News Much Does Airplane Weigh times desirable know much latest creation weighs finding suitable balance can problem Bathroom scales crude hauling plane down market weigh check-out scales attracts lot attention method can used print name address zip code along words First Class wing drop mail plane delivered allow six weeks simply divide postage due $160 determine weight pounds method has certain drawbacks however occa sionally over-zealous postmaster will send plane Air Mail allow eight weeks deliv ery case answer obtained will incorrect Also plane may sustain some damage passing through cancellation sorting machines product review product review product review Axiflo Ducted Fan RK-206 isa maior improve ment Midwest series ducted fan designed around powerful 20-sized engines such K&B 35 cc need assemble RK-20B Midwest claims can done hour fan consists five major pieces Tough ABS plastic nylon glassreinforced nylon used form fan Axiflo Ducted Fan RK20B comes com plete hardware instruction booklet fullsize plans Midwest claims 4 pounds thrust ducted fan fan also includes integral 41/z-oz fuel tank features new system fuel line connections product review product review product review 114 Model Aviation forfldidO PROPELLERS Madeof polyester donotboil orcolor Sizes pitches styles needs AT YOUR DEALER 3 3lade NEW SIZE IN 8 & 10 PITCH 26 $16 Axiflo Ducted Fan Midwest Products Inc. 400 South Indiana St. Hobart IN 46342
Edition: Model Aviation - 1980/01
Page Numbers: 30, 113, 114
LAST month column mentioned some contrasts models used top contenders sailplane world championships last summer highly technical precision approach Austrian German Swiss teams construction models highly contrasted South African U SA teams andtheir straight-forward approach saw store bought models hobby shop materials fliers other countries models fell between limits Deckers highly complex gadgetry design Spavins built week model could labeled kitable obvious in-be tween models time spent construction air Yet showed innovativeness lack practice pre vented better showing builders month well pass some ideas flying techniques whether youre weekend flier contest pro something Wing Spars South Africans some Denmarks team used box-spar construction spruce plywood Full-depth vertical web bing glued between spruce faced plywood case South African birds plywood carried out polyhedral break Danes design straight wing D tube principle plywood carried out full span spar construction strong evidenced South Africans launching technique 12volt winch operated almost constant speed idea build up much flying speed possible top launch release just precise moment burn off ex cess flying speed climbing thereby getting higher launch height winch provided wont discuss height advantage point over pulse/kite method point wings took tremendous strain once did come apart Terry Koplan Steve Work USA replaced spars planes spars carbon fiber glued during wing construction slow-curing epoxy its least reason Terry able carry 60 ounces ballast during windy gusty 12-lap distance run Controls Many glass-covered foam wings included ailerons Most operated directly through torque tubes thereby eliminating loose linkage problems Swiss same Danish team members boxspar-constructed wings straight wings instead ailerons pivoting wings wings pivoted main support rod changed angle attack effect roll lateral movement bellcranks drove wings custom-made take high drive loads support loads during launch ing highspeed turns As spoilers very few foam/glass wings big reason besides installation problem purists built wings within 1/100 millimeter accuracy wouldnt think putting hairline crack top wing As Al Doig says Spoilers de vices reduce lift openedand closed Instead spoilers Olympic II fliers know glass/foam boys used either pop-up canopies trailing edge flap/ airbrake method used Holland German fliers latter systems operated simple torque drive out fuselage wing fairing wing root trailing edge excep tion Dave Worral British team used new approach spoilers Continued page 113 30 Model Aviation Mechanism pivoting wing system Gunnar Hansens Unica Assemblies pivot shaft supported through ball bearings Attached assemblies wing support rods Hansen member Danish team placed eight World Championships Peter Gerber Switzerland Capilla glass fuselage balsa covered wings sleek ship has three control functions rudder elevator movable pivoting wings Modular air brake used Dave Worralwho took seventh last World Champsis shown open position picture Diagram illustrates module fits between two wing ribsalso blades extended cable operation Number modules can varied flier pipes will lead exit fuselage bottom vibration level very low order get sufficient flywheel mass smootlmess long belt life reduce overall length unit flywheel has its outer periphery grooved second wheel meshes Participants urged bring unfinished pro jects Scale Rally several appeared enterprise three Flying Dutchmen Club members 8-engine Hughes Spruce Goose flying boat 16-foot span Power will eight 0S 25 engines projected weight 40 pounds Foam wings covered 1/16 hardwood veneer Fuselage balsa Skip Mast displayed unfinished Lockheed cules Cl 30 will use four K&B 35 engines Construction balsa foam fuselage wings Information Source Leo J Kohn old time modeler aviation writer historian photog rapher has wealth information 45000 plane photos available reasonable prices scale modelers search documenta tion photos 2 X 4W size arranged packs varying quantity few several dozen per pack average price per photo 24 less would cost take own can find plane can get As example Douglas DC-3 photos can 23 different packs arranged ac cording airline additional four packs C-47 military version Some DC-3 packs have few four photos United Air line pack contains abundant 48 actual black white photos made negatives maximum detail list includes military rac ing antique airline business rotorcraft home built aerobatic sailplane classic foreign pre-1920 WW maintains large com prehensive data bank can supply informa tion details almost aircraft Being constant contact modelers search ing documentation color markings Leo gets numerous requests actual color photos WW 1920 era aircraft says modelers must depend black white photos taken state-of-the-art coexisted airplane point possible very least intensely interesting track down correct color schemes other information Color photos available various antique other aircraft types taken EAA other fly-ins usually involves two basic type everybody ends up mod eling same plane Leo also offers scale documentation service will research airplane provide copies whatever information drawings tech nical details color schemes etc can found has backlog such requests generated word among modelers fullsize aircraft restorers well has about 500 color photos feels modelers satisfied easily available color documentation denying themselves great educational opportunity such inherent part Scale hobby Leos service called Collect-Air Photos PO Box 14234 Milwaukee WI 53214 asking data CORRECTION article Cabin Fever December issue editors note stated Walt used 23%- pitch prop 130 winder turns 16-1 turns 085 FAI rubber should have read Walt used 12-in diameter prop 22-inch pitch flew 23% loop 085 FAI rubber 130 winder turns r RADIO SERVICE Futaba IRADIO SOUTH Pro Line provide fast economical in-house service Futaba Kraft Pro Line radios list satisfied Customers reads like Whos R/C competition Call Steve Helms discuss problems having present equipment AT RADIO SOUTH customer satisfaction isnt just motto Its way life Sales gines & parts Power fuel Pro-Prop 1925 East Creighton Rd acola FL 32504 478-6745 IIIISWI NUT INDI9K little piece electronic wizardry quickly easily reverses direction servo travel plugged between receiver servo will work iith positive pulse servos three four wire Connectors NOT furnished _______Available unassembled kit form assembled tested 14K104Ace Servo Reverser kit $795 14K104CAce Servo Reverser assy $1150 details send $1 latest catalog Add $50 1st Class return $1 hand ling direct orders 816 584-7121 catalog include stamp reply postage Color photography became practical late 1 930s no reasonable perma nence color image until after WW II planes built before 1945 color documenta tion will need something other photo such written description Profile Publication becoming rare authentic color chips Un less color photos carefully made seldom agree actual paint samples fore useful documentation would appear AMA rules state proof may photographs drawings written references However must agreed color photo will likely have psychological advantage doubt could cast upon authenticity other kinds proof contemporary subjects irrefutable proof photo model posed prototype color patches verified aircraft owner Finding documentation finish color markings difficult tasks facing modeler chooses obscure subjects Proof accounts 16% static score Precision Scale much greater 30% Sport Scale International Stand-off Scale meet Woodvale surprising number documentations found de ficient area Judges becoming AF E/, In7] BOX SuE HIGGINSVILLE MO 64037 insistent proof furnished will likely influence choice prototype Bob Dolly Wischer RL 1 S-221 Lapham Peak Road Delafield WI 53018 RC Soaring/Pruss continued page 30 defied slick wing purists Dave used set modular air brakes labeled just manufactured same British company produces popular captured towhook Worrals installation neatly done Dassel-like wing though modules designed built-up wing modules designed placed between two-inch rib spacing absolute minimum amount wing alterating What makes neat installa tion module has pivoting blade similar semaphore signal blade designed overlap next module giving system very clean assembly closed Nearly fliers built-up wings used conventional hinge-type spoilers Exception Steve Works Bird Time no spoilers Towhooks Towhooks ranged January1980 113 Go GRISH propeller True helical pitch airfoil win-power 2 Blade Tractor 53each 545354g 63 64Nc 7476 78Nc 8486 88Uc 9496 97 9810-4106Sc 114116118 *1 12412-512-6iUD 2 Blade Pusher 5- 3 5-46-36-4USc 86USc 9610-6*1 3 Blade Tractor 53 6364 HOc 3 Blade Pusher 63USC Metallic Aluminum Color Tractor 168 $1 8688ia 96 106104iUS Pusher106*1U Grumman Guardian XTB3F-28 /\ Class Carrier ICLD-102 IBy I{CataIog25cRog Edwards ERNISTIC MODELS PO BOX 6974 ALBUQ NM 87197 sophisticated simplest Deckers custom-designed built out titanium Na turally Roy Spavins contribution other end towhook wizardry name hardware dealer bought cup hooks Both Austrians hand-towed South Africans winched used simple straight less thing go wrong hooks USA team captured releaseable types Skip used Radio Sailplane type mounted standard fashion Steve used same type mounted up inside fuselage reduce drag Terry used Rocket City towhook installations required different type towring two custommade Sean Bannister England team similar situation towhooks produced simple effective solution tow ring club confivnted problem having correct towring available hook might screwed too close fuselage ring gets ruptured time ole Luke Leadfoot launches 16-foot Behe moth 2000 take lesson English cousins Sean fashioned end pennant withinstead towringan 18-inch nylon coated steel cable fastened ends form loop flexible loop could simply hooked standard towhook could pinched together inserted hidden type hook such Rocket City type So can see exotic materials tolerances second lens polishing won some workshop materials stralght forward building did job others Sunday fliers contest goers can leam something both schools Yet FAI F3B flier work still cut out Whatever design build remember statistics show knew models GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 208 22 10 24 13 RIGHT HAND TRACTOR 6 RISK BROS INDIANA 46373 AEROBATIC AIRPLANES BY RCBT C MORPISON UPERB DRAWINGS S395 PLUS 5O P 0T L2L2.l bestno matter what design favorstood winners circle Dan Pruss Rt 2 Box 490 Pla infield IL 60544 RC Aerobatics/Van Putte continued page 3 airplane ground quickly could Such events plane breakers should avoided have some good ideas Fun Fly events let hear about can share others read ModelAviation second topic common among newsletters instructor problem club has good supply qualified instructors consider yourself lucky lot clubs arent fortunate clubs have two overworked instructors dont have time fly own airplanes sport virtually requires instructor give beginner reasonable chance learning fly breaking lot airplanes other sports way acceptable level competence can developed numerous sports just participating sport course participant usually gets better faster instruc tion instruction isnt necessary flying radio-controlled airplanes beginner can select build fly first RC airplane successfully help rare usually brag about guy good instructors such short supply anything can done improve situation answer depends makeup club attitude club has toward beginners Usually people club instructors fit two general categories first instructor extrovert seeks out beginners offers teach fly second type basically introvert flies airplanes well beginners often ask him help leam fly little needs done develop first type instructors selfstarters already instructors anyway However beginners reluctant approach second type instructor attitude club toward beginners important club attitude positive usually active effort part club officers members get beginners together instructors Clubs proper attitude toward beginners usually dont have instructor prob lem So theres instructor problem club pass favor instructor did Get some beginners touch competent reticent good fliers would fine instructors someone just asked great things about receiving club newsletters opportunity read humorous items contain sample some humor following short article Don Tankersley Birmingham K/C News Much Does Airplane Weigh times desirable know much latest creation weighs finding suitable balance can problem Bathroom scales crude hauling plane down market weigh check-out scales attracts lot attention method can used print name address zip code along words First Class wing drop mail plane delivered allow six weeks simply divide postage due $160 determine weight pounds method has certain drawbacks however occa sionally over-zealous postmaster will send plane Air Mail allow eight weeks deliv ery case answer obtained will incorrect Also plane may sustain some damage passing through cancellation sorting machines product review product review product review Axiflo Ducted Fan RK-206 isa maior improve ment Midwest series ducted fan designed around powerful 20-sized engines such K&B 35 cc need assemble RK-20B Midwest claims can done hour fan consists five major pieces Tough ABS plastic nylon glassreinforced nylon used form fan Axiflo Ducted Fan RK20B comes com plete hardware instruction booklet fullsize plans Midwest claims 4 pounds thrust ducted fan fan also includes integral 41/z-oz fuel tank features new system fuel line connections product review product review product review 114 Model Aviation forfldidO PROPELLERS Madeof polyester donotboil orcolor Sizes pitches styles needs AT YOUR DEALER 3 3lade NEW SIZE IN 8 & 10 PITCH 26 $16 Axiflo Ducted Fan Midwest Products Inc. 400 South Indiana St. Hobart IN 46342