SPORT AEROBATICS Ron Van Putte IN THE June 1980 column asked Charlie Bair Milt Sanders co-designers Zonker RC canard airplane let hear Well Milt Sanders called let know hes stationed England AFB Louisiana Charlie Bair stationed Vance AFB Oklahoma Milt says has some Zonker kits sale fuselage kit fabricated Ralph White Fliteglas Models high quality fuselages anyone would like informa tion about getting Zonker details Bairs Sanders experience unique air plane write Milt Sanders 708 Fendler Parkway Pineville LA 71360 received letter Doug Dahlke Oshkosh WI regarding April 1980 column stated constant pitch prop tends advance distance equal prop pitch revolution prop Doug dis agrees An excerpt what wrote follows prop doesnt tend advance distance equal prop pitch know theory offwoy way off aint close Lets take Fox 35a very common engineand put 10 x 6 Top Flite prop use Fox SuperFuel RC sport ship would expect top speed around 80 mph Yet Dukes rated rpm 9500 shouldnt over 56 mph 100% efficiency Yes know engines unload air Ive never heard 60% unloading air would appreciate whatever comments care make fact model planes fly bunch faster prop pitch suggests could should didnt really want get technical discussion propellers work doesnt seem way out Perhaps can clear air three diagrams cross section propeller simple airfoil Figure 1 three arrows figure demon strate three different conditions first commonthe airfoil developing lift thrust air moving across airfoil direction shown air moves second case lift produced zero air moving across airfoil third case negative lift produced course airplane must produce sufficient thrust overcome drag will slow down means second third cases pertinent discussion can ignored Lets take look propeller turning over airplane rest airflow relative propeller shown Figure 2 Note airflow opposite direction rota tion propeller Now lets look what happens airplane moving forward airflow due forward motion added vectorially airflow due rotation obtain direction total airflow relative propeller Figure 3 Note speed increased angle total airflow vector changes will eventually reach zero thrust angle airplane could go fast enough course way make propeller turn faster effect forward motion would reduced airplane could go faster before zero thrust speed reached limiting factor propeller speed drag produced propeller Consequently lot work has done blade shape airfoil cross section reduce drag Lets back up bit airplane rest fixed-pitch prop high drag situ ation engine bogs down trying turn rotational speed maximum engine power output However airplane moves forward angle attack prop sees reduced drag goes down engine capable turning prop faster unloading situation keeps changing until thrust produced prop equal airplane drag maximum speed air plane fuel engine prop suppose glow plug combination Everything else being equal way increase airplane speed working propeller Now lets go back Dougs disagreement statement about prop tending advance distance equal prop pitch revolution airplane moved faster what would expect based prop pitch propeller would negative thrust region airplane would have slow down So what wrong Dougs example nothing wrong example except engine must unloading sufficiently permit engine rotational speed reach necessary value dont get something nothing other explanation can come up would physically impossible Part reason confusion about unloading phenomenon several engine manufacturers conservative about report32 Model Aviation Mr Smooth Don Lowe readies eighth famous series rnoenlx airplanes prettiest best flier too nnaiiun lignieri wings rreeiaIIs too iving orrrneratortne land- Uaption seen thewing model made castaway bits pieces New Orleans contest ing engine performance during static test suspect Fox ever other manufacturers report engine rpm high side confusion results subject engines heres another tidbit Rudder Brudder pub lished Sentral illinois Radio Society newsletter Vibration larger displacement engines comes mass single piston solution lies lightening piston reduce mass can best accom plished drilling multitude lightening holes though top piston may find will have decreasing effect compression engine lithe cylinder tightly clamped large vise overnight will find c6mpression has greatly restored use little trick engines have terrific compression engine head removed Another method counteract mass single piston overbalance prop blade opposite piston can done Scotch-taping fishing weights back side blade attach front looks bad hope find tips helpful Rudder Brudder chatting Jim Medley Conyers GA Huntsville AL contest asked ilL intersted building ideas column course always am proceeded tell about technique usese wing horizontal stabilizer tips alleviate effects hangar rash familiar damaged tips result bump ing relatively soft balsa usually Continued page 110 November 1980 33 Frank also scored best flight meet aided 15% bonus last round Standoff flown late fourth day after F4C round wind magically died flights expected trend toward complex planes take advantage bonuses has yet developed Only two F4C biplanes Knowles Tiger Moth Lennas Curtiss XSBC-4 re ceived 15% bonus others 5 10% class relatively simple planes Two years ago Woodvale twin appeared Ottawa two twins Standoff Complex twins require power fly safely pair of30 engines 60 total maximum F4C until 1983 does attract modelers George Roses Curtiss Hawk P6-E leader after first day flying Planes severely damaged wind included folding-wing Westland Widgeon Australia flown Ross Woodcock Cessna Bird Dog L-19 Gerry Fingler Bird Dogs complete exterior constructed molded ABS plastic sheetwhich included much detail such rivets though badly damaged flown following day no apparent visible blemishes Widgeon did fly again repairable Bob Underwoods new Hiperbipe replace ment lost 79 NATS suffered its first flight because poor engine run prompted Bob change engines improvement apparent later flights Mick Reeves Spitfire lost its lower engine cowl soon after takeoff rule requires model flown judged took effect give him zero score first flight Mick designed novel method cooling completely cowled HP 61 engine Air taken scoop under cowl ducted forward concerned about cooling effect weather should turn really hot system successful Mick entered two Spitfires class Third highest static score F4C awarded Joe McCollums Volksplane VP2 cockpit model pilot remarkable resemblance Joe including beard mous tache Inside Wee Joe called servos operate stick rudder pedals connected wires elevator rudder pilot flew plane feature gave Joe high ingenuity points VP2 detailed completely CAP 20 Jean Rousseau received highest static score factor eventually led first place finish Jean competitor use gear-reduction Webra engine Cooling became problem CAP Jean removed dummy engine obstructed air flow dis covered judges first flight lost result portion dummy engine replaced satisfy rule against removing thing after static judging engine over heated crucial third flight last meet plane dead- sticked landing just short circle appeared could spoil chance first place final day F4C flights George Rose first fly relative calm early morning high score flight put him apparent first place until Rousseaus score posted meets end latter emerged winner -point over Rose could have climactic ending least three model entries appearing third World Championships Rene Fouquereaus CAP 20 Bob Wischers Piel Beryl Terry Mellenys deHavilland Moth Minor best weathering job have ever seen nine-year-old P-Si B David Vaughan look well-used fighter missions Fournier Duncan Hutson homemade retract mechanism folding wings on-board engine starter in-the-air restarts Fournier few planes can use starter advantage flight option because practice used proto type Four entries models homebuilt planes Judges F4C Johnnie Carroll Ireland Paul Jones Canada Herbert Steinhauer West Germany Serge Zwahlen France John Preston US Judges Standoff Scale Dick Carson US Stephan Gray Canada John Preston U S Peter Merrick Canada ceremony memory Glen Sigafoose day funeral news death came shock attendance modeling fraternity owes debt gratitude Sigs shirts worn F4C team gifts Sig shirts received other World Champion ships RC Giant Scale/Beckman Continued page 31 would expect other words has standard model building techniquescomfort able us part adequate lower end Giant Scale range plans well-drawn clear suf ficient detail experienced modeler would recommend beginner youve experience built-up sheeted fuselage wing construction youll have no trouble understanding Dons plans Cowls canopies can problem big birds cowl built-up balsa ply shown plans should quite effective No information provided canopy hut mostly simple curves could made sheet plastic believe includes wind shield compound curve aftermost section possible section cut large bubble canopy would suitable Don may have canopy available time read warning several fittings control horns etc depend solder joints Although plans specify hard soldering brazing opinion necessary Soft solder so-called silver solders like Sta-brite have strength required summary Dons plans adequate experienced modelers lack detail needed beginners Built shown model should fairly light perform well Quadra similar engine Order Aero Plan 101 SW 2nd St Pompano Beach FL 33060 notes dont include price believe about $20 Future plan reviews presently have eight sets plans waiting line Its obvious now wont have time column space available until after flying season meantime what have hand listed below anyone interested particular plan cant wait send SASE Ill tell what can about list A-scale Liberty Sport Bucker Jungmeister Wendell Hostetler 1/ scale Druine Turbulent Doug MacBrien 275 scale Curtiss P-40E Bob Morse -scale Fairchild PT-19 Jim Folline -scale Piper L-4B Ken Runestrand 1 ft 1 meter scale Fokker DVIII Bill Wendt -scale Ercoupe Jim Messer Bob Beckman 8248 Holly Grove Ct Manassas VA 22110 703 369-2432 RC Aerobatics/Van Putte Continued page 33 used technique Jim described very easy implement resulted un believable improvement ding resis tance tips new Phoenix 8 After foam wing sheeted flat piece balsa glued tip mark straight line along center tip airfoil 110 Model Aviation section balsa piece mark two parallel lines 1/32-in either side center line Cut piece 1/16-in plywood planform shape tip installed Using cyanoacrylate glue like Hot Stuff Zap Jet glue plywood piece balsa plate perpendicular tip aligned parallel lines youve just drawn Cut two soft balsa blocks roughly shape glue plate plywood Now sand tip shape Youll note plywood piece makes great template sanding youre done can hardly see plywood However first time ding tip youll probably have damage Great idea know idea new based what Ive heard since new thank Jim As written final stages completing work new Phoenix 8 Nats nine days finish airplane test fly make necessary trim adjustments get some practice before leaving Wilmington OH years will finish airplane sufficient time wont have excuses performance competition Ron Van Putte 12 Connie Drive Shalimar FL 32579 RC Soaring/Pruss Continued page 35 launch bad air Winches open after initial rotation selected via draw Fliers called allowed launch pass once given choices winches open contest slept Briefing wasnt until 9 oclock first launch ******** ** * * * * **** * *** Test Run Engine FOX 19-RC * 15000 rpm 8-4 * Weight 5-112 ounces * Bore 650 * Stroke 600 * Displacement 19 Fox 19 RC $4195 Fox Silencer available fit No 90222 Size B @ $795 American-Made Engines Its just plain bearing engine saves lots bucks FOX 19 delivers power greater baffle 19 have ever testedand sur passes some Schneurle 19 engines Ball bearings nice fancy carburetors neat price no oblect time-proven powerplant runs throttles idles league 19s costing twice price Thats lot save Its find Fos products field flying action ia Hot Line 501 6461656 CO 5305 TOWSON AVE FORT SMITH ARK 7201 F uthorized %dio r ontro ervice FACTORY AUTHORIZED SER VICE FOR ALL OF THE FOLLOWING BRANDS Ace Aero Sport Cannon Cirrus Kraft World Engines EK Logictrol Micro Avionics Pro Line Orbit Msthes* D&D RS Systems Royal Simprop * Jerobee *ALSO WARRANTY SER VICE EXPERTSER VICE FOR ALL BRANDS Don McCarthy Factory trained technicians over 15 years Radio Control Electronics 0 HOURS Closed Sun & Mon lOam-8 pmWedFri 10 am-6pm Sat 10 am-2 pm 714 639-8886 941 N MAIN ST. ORANGE CALIFORNIA 92667 November 1980 1 1 1 Lubricants. An Imnortant items $2 19 unless otherwise noted Motor Oil Lgt* #102Gear Lubricant #104Synthetic lnstr /Motor Oil Med #106Grease Fortified W/Teflon #107Motor Oil Medium #108Motor Oil Light #111Light Oil #134Powdered Teflon Dry Lttbricant #135Powdered Graphite Dry Lubricant *Not Use Plastics ElIMm Igcene unduyour dealer about us stries P0 Box 328 Bensenville IL 60106 Ralph Learmont Kestrel 17 avail able kit form spans 1684 weighs 8 lb information article
Edition: Model Aviation - 1980/11
Page Numbers: 32, 33, 110, 111
SPORT AEROBATICS Ron Van Putte IN THE June 1980 column asked Charlie Bair Milt Sanders co-designers Zonker RC canard airplane let hear Well Milt Sanders called let know hes stationed England AFB Louisiana Charlie Bair stationed Vance AFB Oklahoma Milt says has some Zonker kits sale fuselage kit fabricated Ralph White Fliteglas Models high quality fuselages anyone would like informa tion about getting Zonker details Bairs Sanders experience unique air plane write Milt Sanders 708 Fendler Parkway Pineville LA 71360 received letter Doug Dahlke Oshkosh WI regarding April 1980 column stated constant pitch prop tends advance distance equal prop pitch revolution prop Doug dis agrees An excerpt what wrote follows prop doesnt tend advance distance equal prop pitch know theory offwoy way off aint close Lets take Fox 35a very common engineand put 10 x 6 Top Flite prop use Fox SuperFuel RC sport ship would expect top speed around 80 mph Yet Dukes rated rpm 9500 shouldnt over 56 mph 100% efficiency Yes know engines unload air Ive never heard 60% unloading air would appreciate whatever comments care make fact model planes fly bunch faster prop pitch suggests could should didnt really want get technical discussion propellers work doesnt seem way out Perhaps can clear air three diagrams cross section propeller simple airfoil Figure 1 three arrows figure demon strate three different conditions first commonthe airfoil developing lift thrust air moving across airfoil direction shown air moves second case lift produced zero air moving across airfoil third case negative lift produced course airplane must produce sufficient thrust overcome drag will slow down means second third cases pertinent discussion can ignored Lets take look propeller turning over airplane rest airflow relative propeller shown Figure 2 Note airflow opposite direction rota tion propeller Now lets look what happens airplane moving forward airflow due forward motion added vectorially airflow due rotation obtain direction total airflow relative propeller Figure 3 Note speed increased angle total airflow vector changes will eventually reach zero thrust angle airplane could go fast enough course way make propeller turn faster effect forward motion would reduced airplane could go faster before zero thrust speed reached limiting factor propeller speed drag produced propeller Consequently lot work has done blade shape airfoil cross section reduce drag Lets back up bit airplane rest fixed-pitch prop high drag situ ation engine bogs down trying turn rotational speed maximum engine power output However airplane moves forward angle attack prop sees reduced drag goes down engine capable turning prop faster unloading situation keeps changing until thrust produced prop equal airplane drag maximum speed air plane fuel engine prop suppose glow plug combination Everything else being equal way increase airplane speed working propeller Now lets go back Dougs disagreement statement about prop tending advance distance equal prop pitch revolution airplane moved faster what would expect based prop pitch propeller would negative thrust region airplane would have slow down So what wrong Dougs example nothing wrong example except engine must unloading sufficiently permit engine rotational speed reach necessary value dont get something nothing other explanation can come up would physically impossible Part reason confusion about unloading phenomenon several engine manufacturers conservative about report32 Model Aviation Mr Smooth Don Lowe readies eighth famous series rnoenlx airplanes prettiest best flier too nnaiiun lignieri wings rreeiaIIs too iving orrrneratortne land- Uaption seen thewing model made castaway bits pieces New Orleans contest ing engine performance during static test suspect Fox ever other manufacturers report engine rpm high side confusion results subject engines heres another tidbit Rudder Brudder pub lished Sentral illinois Radio Society newsletter Vibration larger displacement engines comes mass single piston solution lies lightening piston reduce mass can best accom plished drilling multitude lightening holes though top piston may find will have decreasing effect compression engine lithe cylinder tightly clamped large vise overnight will find c6mpression has greatly restored use little trick engines have terrific compression engine head removed Another method counteract mass single piston overbalance prop blade opposite piston can done Scotch-taping fishing weights back side blade attach front looks bad hope find tips helpful Rudder Brudder chatting Jim Medley Conyers GA Huntsville AL contest asked ilL intersted building ideas column course always am proceeded tell about technique usese wing horizontal stabilizer tips alleviate effects hangar rash familiar damaged tips result bump ing relatively soft balsa usually Continued page 110 November 1980 33 Frank also scored best flight meet aided 15% bonus last round Standoff flown late fourth day after F4C round wind magically died flights expected trend toward complex planes take advantage bonuses has yet developed Only two F4C biplanes Knowles Tiger Moth Lennas Curtiss XSBC-4 re ceived 15% bonus others 5 10% class relatively simple planes Two years ago Woodvale twin appeared Ottawa two twins Standoff Complex twins require power fly safely pair of30 engines 60 total maximum F4C until 1983 does attract modelers George Roses Curtiss Hawk P6-E leader after first day flying Planes severely damaged wind included folding-wing Westland Widgeon Australia flown Ross Woodcock Cessna Bird Dog L-19 Gerry Fingler Bird Dogs complete exterior constructed molded ABS plastic sheetwhich included much detail such rivets though badly damaged flown following day no apparent visible blemishes Widgeon did fly again repairable Bob Underwoods new Hiperbipe replace ment lost 79 NATS suffered its first flight because poor engine run prompted Bob change engines improvement apparent later flights Mick Reeves Spitfire lost its lower engine cowl soon after takeoff rule requires model flown judged took effect give him zero score first flight Mick designed novel method cooling completely cowled HP 61 engine Air taken scoop under cowl ducted forward concerned about cooling effect weather should turn really hot system successful Mick entered two Spitfires class Third highest static score F4C awarded Joe McCollums Volksplane VP2 cockpit model pilot remarkable resemblance Joe including beard mous tache Inside Wee Joe called servos operate stick rudder pedals connected wires elevator rudder pilot flew plane feature gave Joe high ingenuity points VP2 detailed completely CAP 20 Jean Rousseau received highest static score factor eventually led first place finish Jean competitor use gear-reduction Webra engine Cooling became problem CAP Jean removed dummy engine obstructed air flow dis covered judges first flight lost result portion dummy engine replaced satisfy rule against removing thing after static judging engine over heated crucial third flight last meet plane dead- sticked landing just short circle appeared could spoil chance first place final day F4C flights George Rose first fly relative calm early morning high score flight put him apparent first place until Rousseaus score posted meets end latter emerged winner -point over Rose could have climactic ending least three model entries appearing third World Championships Rene Fouquereaus CAP 20 Bob Wischers Piel Beryl Terry Mellenys deHavilland Moth Minor best weathering job have ever seen nine-year-old P-Si B David Vaughan look well-used fighter missions Fournier Duncan Hutson homemade retract mechanism folding wings on-board engine starter in-the-air restarts Fournier few planes can use starter advantage flight option because practice used proto type Four entries models homebuilt planes Judges F4C Johnnie Carroll Ireland Paul Jones Canada Herbert Steinhauer West Germany Serge Zwahlen France John Preston US Judges Standoff Scale Dick Carson US Stephan Gray Canada John Preston U S Peter Merrick Canada ceremony memory Glen Sigafoose day funeral news death came shock attendance modeling fraternity owes debt gratitude Sigs shirts worn F4C team gifts Sig shirts received other World Champion ships RC Giant Scale/Beckman Continued page 31 would expect other words has standard model building techniquescomfort able us part adequate lower end Giant Scale range plans well-drawn clear suf ficient detail experienced modeler would recommend beginner youve experience built-up sheeted fuselage wing construction youll have no trouble understanding Dons plans Cowls canopies can problem big birds cowl built-up balsa ply shown plans should quite effective No information provided canopy hut mostly simple curves could made sheet plastic believe includes wind shield compound curve aftermost section possible section cut large bubble canopy would suitable Don may have canopy available time read warning several fittings control horns etc depend solder joints Although plans specify hard soldering brazing opinion necessary Soft solder so-called silver solders like Sta-brite have strength required summary Dons plans adequate experienced modelers lack detail needed beginners Built shown model should fairly light perform well Quadra similar engine Order Aero Plan 101 SW 2nd St Pompano Beach FL 33060 notes dont include price believe about $20 Future plan reviews presently have eight sets plans waiting line Its obvious now wont have time column space available until after flying season meantime what have hand listed below anyone interested particular plan cant wait send SASE Ill tell what can about list A-scale Liberty Sport Bucker Jungmeister Wendell Hostetler 1/ scale Druine Turbulent Doug MacBrien 275 scale Curtiss P-40E Bob Morse -scale Fairchild PT-19 Jim Folline -scale Piper L-4B Ken Runestrand 1 ft 1 meter scale Fokker DVIII Bill Wendt -scale Ercoupe Jim Messer Bob Beckman 8248 Holly Grove Ct Manassas VA 22110 703 369-2432 RC Aerobatics/Van Putte Continued page 33 used technique Jim described very easy implement resulted un believable improvement ding resis tance tips new Phoenix 8 After foam wing sheeted flat piece balsa glued tip mark straight line along center tip airfoil 110 Model Aviation section balsa piece mark two parallel lines 1/32-in either side center line Cut piece 1/16-in plywood planform shape tip installed Using cyanoacrylate glue like Hot Stuff Zap Jet glue plywood piece balsa plate perpendicular tip aligned parallel lines youve just drawn Cut two soft balsa blocks roughly shape glue plate plywood Now sand tip shape Youll note plywood piece makes great template sanding youre done can hardly see plywood However first time ding tip youll probably have damage Great idea know idea new based what Ive heard since new thank Jim As written final stages completing work new Phoenix 8 Nats nine days finish airplane test fly make necessary trim adjustments get some practice before leaving Wilmington OH years will finish airplane sufficient time wont have excuses performance competition Ron Van Putte 12 Connie Drive Shalimar FL 32579 RC Soaring/Pruss Continued page 35 launch bad air Winches open after initial rotation selected via draw Fliers called allowed launch pass once given choices winches open contest slept Briefing wasnt until 9 oclock first launch ******** ** * * * * **** * *** Test Run Engine FOX 19-RC * 15000 rpm 8-4 * Weight 5-112 ounces * Bore 650 * Stroke 600 * Displacement 19 Fox 19 RC $4195 Fox Silencer available fit No 90222 Size B @ $795 American-Made Engines Its just plain bearing engine saves lots bucks FOX 19 delivers power greater baffle 19 have ever testedand sur passes some Schneurle 19 engines Ball bearings nice fancy carburetors neat price no oblect time-proven powerplant runs throttles idles league 19s costing twice price Thats lot save Its find Fos products field flying action ia Hot Line 501 6461656 CO 5305 TOWSON AVE FORT SMITH ARK 7201 F uthorized %dio r ontro ervice FACTORY AUTHORIZED SER VICE FOR ALL OF THE FOLLOWING BRANDS Ace Aero Sport Cannon Cirrus Kraft World Engines EK Logictrol Micro Avionics Pro Line Orbit Msthes* D&D RS Systems Royal Simprop * Jerobee *ALSO WARRANTY SER VICE EXPERTSER VICE FOR ALL BRANDS Don McCarthy Factory trained technicians over 15 years Radio Control Electronics 0 HOURS Closed Sun & Mon lOam-8 pmWedFri 10 am-6pm Sat 10 am-2 pm 714 639-8886 941 N MAIN ST. ORANGE CALIFORNIA 92667 November 1980 1 1 1 Lubricants. An Imnortant items $2 19 unless otherwise noted Motor Oil Lgt* #102Gear Lubricant #104Synthetic lnstr /Motor Oil Med #106Grease Fortified W/Teflon #107Motor Oil Medium #108Motor Oil Light #111Light Oil #134Powdered Teflon Dry Lttbricant #135Powdered Graphite Dry Lubricant *Not Use Plastics ElIMm Igcene unduyour dealer about us stries P0 Box 328 Bensenville IL 60106 Ralph Learmont Kestrel 17 avail able kit form spans 1684 weighs 8 lb information article
Edition: Model Aviation - 1980/11
Page Numbers: 32, 33, 110, 111
SPORT AEROBATICS Ron Van Putte IN THE June 1980 column asked Charlie Bair Milt Sanders co-designers Zonker RC canard airplane let hear Well Milt Sanders called let know hes stationed England AFB Louisiana Charlie Bair stationed Vance AFB Oklahoma Milt says has some Zonker kits sale fuselage kit fabricated Ralph White Fliteglas Models high quality fuselages anyone would like informa tion about getting Zonker details Bairs Sanders experience unique air plane write Milt Sanders 708 Fendler Parkway Pineville LA 71360 received letter Doug Dahlke Oshkosh WI regarding April 1980 column stated constant pitch prop tends advance distance equal prop pitch revolution prop Doug dis agrees An excerpt what wrote follows prop doesnt tend advance distance equal prop pitch know theory offwoy way off aint close Lets take Fox 35a very common engineand put 10 x 6 Top Flite prop use Fox SuperFuel RC sport ship would expect top speed around 80 mph Yet Dukes rated rpm 9500 shouldnt over 56 mph 100% efficiency Yes know engines unload air Ive never heard 60% unloading air would appreciate whatever comments care make fact model planes fly bunch faster prop pitch suggests could should didnt really want get technical discussion propellers work doesnt seem way out Perhaps can clear air three diagrams cross section propeller simple airfoil Figure 1 three arrows figure demon strate three different conditions first commonthe airfoil developing lift thrust air moving across airfoil direction shown air moves second case lift produced zero air moving across airfoil third case negative lift produced course airplane must produce sufficient thrust overcome drag will slow down means second third cases pertinent discussion can ignored Lets take look propeller turning over airplane rest airflow relative propeller shown Figure 2 Note airflow opposite direction rota tion propeller Now lets look what happens airplane moving forward airflow due forward motion added vectorially airflow due rotation obtain direction total airflow relative propeller Figure 3 Note speed increased angle total airflow vector changes will eventually reach zero thrust angle airplane could go fast enough course way make propeller turn faster effect forward motion would reduced airplane could go faster before zero thrust speed reached limiting factor propeller speed drag produced propeller Consequently lot work has done blade shape airfoil cross section reduce drag Lets back up bit airplane rest fixed-pitch prop high drag situ ation engine bogs down trying turn rotational speed maximum engine power output However airplane moves forward angle attack prop sees reduced drag goes down engine capable turning prop faster unloading situation keeps changing until thrust produced prop equal airplane drag maximum speed air plane fuel engine prop suppose glow plug combination Everything else being equal way increase airplane speed working propeller Now lets go back Dougs disagreement statement about prop tending advance distance equal prop pitch revolution airplane moved faster what would expect based prop pitch propeller would negative thrust region airplane would have slow down So what wrong Dougs example nothing wrong example except engine must unloading sufficiently permit engine rotational speed reach necessary value dont get something nothing other explanation can come up would physically impossible Part reason confusion about unloading phenomenon several engine manufacturers conservative about report32 Model Aviation Mr Smooth Don Lowe readies eighth famous series rnoenlx airplanes prettiest best flier too nnaiiun lignieri wings rreeiaIIs too iving orrrneratortne land- Uaption seen thewing model made castaway bits pieces New Orleans contest ing engine performance during static test suspect Fox ever other manufacturers report engine rpm high side confusion results subject engines heres another tidbit Rudder Brudder pub lished Sentral illinois Radio Society newsletter Vibration larger displacement engines comes mass single piston solution lies lightening piston reduce mass can best accom plished drilling multitude lightening holes though top piston may find will have decreasing effect compression engine lithe cylinder tightly clamped large vise overnight will find c6mpression has greatly restored use little trick engines have terrific compression engine head removed Another method counteract mass single piston overbalance prop blade opposite piston can done Scotch-taping fishing weights back side blade attach front looks bad hope find tips helpful Rudder Brudder chatting Jim Medley Conyers GA Huntsville AL contest asked ilL intersted building ideas column course always am proceeded tell about technique usese wing horizontal stabilizer tips alleviate effects hangar rash familiar damaged tips result bump ing relatively soft balsa usually Continued page 110 November 1980 33 Frank also scored best flight meet aided 15% bonus last round Standoff flown late fourth day after F4C round wind magically died flights expected trend toward complex planes take advantage bonuses has yet developed Only two F4C biplanes Knowles Tiger Moth Lennas Curtiss XSBC-4 re ceived 15% bonus others 5 10% class relatively simple planes Two years ago Woodvale twin appeared Ottawa two twins Standoff Complex twins require power fly safely pair of30 engines 60 total maximum F4C until 1983 does attract modelers George Roses Curtiss Hawk P6-E leader after first day flying Planes severely damaged wind included folding-wing Westland Widgeon Australia flown Ross Woodcock Cessna Bird Dog L-19 Gerry Fingler Bird Dogs complete exterior constructed molded ABS plastic sheetwhich included much detail such rivets though badly damaged flown following day no apparent visible blemishes Widgeon did fly again repairable Bob Underwoods new Hiperbipe replace ment lost 79 NATS suffered its first flight because poor engine run prompted Bob change engines improvement apparent later flights Mick Reeves Spitfire lost its lower engine cowl soon after takeoff rule requires model flown judged took effect give him zero score first flight Mick designed novel method cooling completely cowled HP 61 engine Air taken scoop under cowl ducted forward concerned about cooling effect weather should turn really hot system successful Mick entered two Spitfires class Third highest static score F4C awarded Joe McCollums Volksplane VP2 cockpit model pilot remarkable resemblance Joe including beard mous tache Inside Wee Joe called servos operate stick rudder pedals connected wires elevator rudder pilot flew plane feature gave Joe high ingenuity points VP2 detailed completely CAP 20 Jean Rousseau received highest static score factor eventually led first place finish Jean competitor use gear-reduction Webra engine Cooling became problem CAP Jean removed dummy engine obstructed air flow dis covered judges first flight lost result portion dummy engine replaced satisfy rule against removing thing after static judging engine over heated crucial third flight last meet plane dead- sticked landing just short circle appeared could spoil chance first place final day F4C flights George Rose first fly relative calm early morning high score flight put him apparent first place until Rousseaus score posted meets end latter emerged winner -point over Rose could have climactic ending least three model entries appearing third World Championships Rene Fouquereaus CAP 20 Bob Wischers Piel Beryl Terry Mellenys deHavilland Moth Minor best weathering job have ever seen nine-year-old P-Si B David Vaughan look well-used fighter missions Fournier Duncan Hutson homemade retract mechanism folding wings on-board engine starter in-the-air restarts Fournier few planes can use starter advantage flight option because practice used proto type Four entries models homebuilt planes Judges F4C Johnnie Carroll Ireland Paul Jones Canada Herbert Steinhauer West Germany Serge Zwahlen France John Preston US Judges Standoff Scale Dick Carson US Stephan Gray Canada John Preston U S Peter Merrick Canada ceremony memory Glen Sigafoose day funeral news death came shock attendance modeling fraternity owes debt gratitude Sigs shirts worn F4C team gifts Sig shirts received other World Champion ships RC Giant Scale/Beckman Continued page 31 would expect other words has standard model building techniquescomfort able us part adequate lower end Giant Scale range plans well-drawn clear suf ficient detail experienced modeler would recommend beginner youve experience built-up sheeted fuselage wing construction youll have no trouble understanding Dons plans Cowls canopies can problem big birds cowl built-up balsa ply shown plans should quite effective No information provided canopy hut mostly simple curves could made sheet plastic believe includes wind shield compound curve aftermost section possible section cut large bubble canopy would suitable Don may have canopy available time read warning several fittings control horns etc depend solder joints Although plans specify hard soldering brazing opinion necessary Soft solder so-called silver solders like Sta-brite have strength required summary Dons plans adequate experienced modelers lack detail needed beginners Built shown model should fairly light perform well Quadra similar engine Order Aero Plan 101 SW 2nd St Pompano Beach FL 33060 notes dont include price believe about $20 Future plan reviews presently have eight sets plans waiting line Its obvious now wont have time column space available until after flying season meantime what have hand listed below anyone interested particular plan cant wait send SASE Ill tell what can about list A-scale Liberty Sport Bucker Jungmeister Wendell Hostetler 1/ scale Druine Turbulent Doug MacBrien 275 scale Curtiss P-40E Bob Morse -scale Fairchild PT-19 Jim Folline -scale Piper L-4B Ken Runestrand 1 ft 1 meter scale Fokker DVIII Bill Wendt -scale Ercoupe Jim Messer Bob Beckman 8248 Holly Grove Ct Manassas VA 22110 703 369-2432 RC Aerobatics/Van Putte Continued page 33 used technique Jim described very easy implement resulted un believable improvement ding resis tance tips new Phoenix 8 After foam wing sheeted flat piece balsa glued tip mark straight line along center tip airfoil 110 Model Aviation section balsa piece mark two parallel lines 1/32-in either side center line Cut piece 1/16-in plywood planform shape tip installed Using cyanoacrylate glue like Hot Stuff Zap Jet glue plywood piece balsa plate perpendicular tip aligned parallel lines youve just drawn Cut two soft balsa blocks roughly shape glue plate plywood Now sand tip shape Youll note plywood piece makes great template sanding youre done can hardly see plywood However first time ding tip youll probably have damage Great idea know idea new based what Ive heard since new thank Jim As written final stages completing work new Phoenix 8 Nats nine days finish airplane test fly make necessary trim adjustments get some practice before leaving Wilmington OH years will finish airplane sufficient time wont have excuses performance competition Ron Van Putte 12 Connie Drive Shalimar FL 32579 RC Soaring/Pruss Continued page 35 launch bad air Winches open after initial rotation selected via draw Fliers called allowed launch pass once given choices winches open contest slept Briefing wasnt until 9 oclock first launch ******** ** * * * * **** * *** Test Run Engine FOX 19-RC * 15000 rpm 8-4 * Weight 5-112 ounces * Bore 650 * Stroke 600 * Displacement 19 Fox 19 RC $4195 Fox Silencer available fit No 90222 Size B @ $795 American-Made Engines Its just plain bearing engine saves lots bucks FOX 19 delivers power greater baffle 19 have ever testedand sur passes some Schneurle 19 engines Ball bearings nice fancy carburetors neat price no oblect time-proven powerplant runs throttles idles league 19s costing twice price Thats lot save Its find Fos products field flying action ia Hot Line 501 6461656 CO 5305 TOWSON AVE FORT SMITH ARK 7201 F uthorized %dio r ontro ervice FACTORY AUTHORIZED SER VICE FOR ALL OF THE FOLLOWING BRANDS Ace Aero Sport Cannon Cirrus Kraft World Engines EK Logictrol Micro Avionics Pro Line Orbit Msthes* D&D RS Systems Royal Simprop * Jerobee *ALSO WARRANTY SER VICE EXPERTSER VICE FOR ALL BRANDS Don McCarthy Factory trained technicians over 15 years Radio Control Electronics 0 HOURS Closed Sun & Mon lOam-8 pmWedFri 10 am-6pm Sat 10 am-2 pm 714 639-8886 941 N MAIN ST. ORANGE CALIFORNIA 92667 November 1980 1 1 1 Lubricants. An Imnortant items $2 19 unless otherwise noted Motor Oil Lgt* #102Gear Lubricant #104Synthetic lnstr /Motor Oil Med #106Grease Fortified W/Teflon #107Motor Oil Medium #108Motor Oil Light #111Light Oil #134Powdered Teflon Dry Lttbricant #135Powdered Graphite Dry Lubricant *Not Use Plastics ElIMm Igcene unduyour dealer about us stries P0 Box 328 Bensenville IL 60106 Ralph Learmont Kestrel 17 avail able kit form spans 1684 weighs 8 lb information article
Edition: Model Aviation - 1980/11
Page Numbers: 32, 33, 110, 111
SPORT AEROBATICS Ron Van Putte IN THE June 1980 column asked Charlie Bair Milt Sanders co-designers Zonker RC canard airplane let hear Well Milt Sanders called let know hes stationed England AFB Louisiana Charlie Bair stationed Vance AFB Oklahoma Milt says has some Zonker kits sale fuselage kit fabricated Ralph White Fliteglas Models high quality fuselages anyone would like informa tion about getting Zonker details Bairs Sanders experience unique air plane write Milt Sanders 708 Fendler Parkway Pineville LA 71360 received letter Doug Dahlke Oshkosh WI regarding April 1980 column stated constant pitch prop tends advance distance equal prop pitch revolution prop Doug dis agrees An excerpt what wrote follows prop doesnt tend advance distance equal prop pitch know theory offwoy way off aint close Lets take Fox 35a very common engineand put 10 x 6 Top Flite prop use Fox SuperFuel RC sport ship would expect top speed around 80 mph Yet Dukes rated rpm 9500 shouldnt over 56 mph 100% efficiency Yes know engines unload air Ive never heard 60% unloading air would appreciate whatever comments care make fact model planes fly bunch faster prop pitch suggests could should didnt really want get technical discussion propellers work doesnt seem way out Perhaps can clear air three diagrams cross section propeller simple airfoil Figure 1 three arrows figure demon strate three different conditions first commonthe airfoil developing lift thrust air moving across airfoil direction shown air moves second case lift produced zero air moving across airfoil third case negative lift produced course airplane must produce sufficient thrust overcome drag will slow down means second third cases pertinent discussion can ignored Lets take look propeller turning over airplane rest airflow relative propeller shown Figure 2 Note airflow opposite direction rota tion propeller Now lets look what happens airplane moving forward airflow due forward motion added vectorially airflow due rotation obtain direction total airflow relative propeller Figure 3 Note speed increased angle total airflow vector changes will eventually reach zero thrust angle airplane could go fast enough course way make propeller turn faster effect forward motion would reduced airplane could go faster before zero thrust speed reached limiting factor propeller speed drag produced propeller Consequently lot work has done blade shape airfoil cross section reduce drag Lets back up bit airplane rest fixed-pitch prop high drag situ ation engine bogs down trying turn rotational speed maximum engine power output However airplane moves forward angle attack prop sees reduced drag goes down engine capable turning prop faster unloading situation keeps changing until thrust produced prop equal airplane drag maximum speed air plane fuel engine prop suppose glow plug combination Everything else being equal way increase airplane speed working propeller Now lets go back Dougs disagreement statement about prop tending advance distance equal prop pitch revolution airplane moved faster what would expect based prop pitch propeller would negative thrust region airplane would have slow down So what wrong Dougs example nothing wrong example except engine must unloading sufficiently permit engine rotational speed reach necessary value dont get something nothing other explanation can come up would physically impossible Part reason confusion about unloading phenomenon several engine manufacturers conservative about report32 Model Aviation Mr Smooth Don Lowe readies eighth famous series rnoenlx airplanes prettiest best flier too nnaiiun lignieri wings rreeiaIIs too iving orrrneratortne land- Uaption seen thewing model made castaway bits pieces New Orleans contest ing engine performance during static test suspect Fox ever other manufacturers report engine rpm high side confusion results subject engines heres another tidbit Rudder Brudder pub lished Sentral illinois Radio Society newsletter Vibration larger displacement engines comes mass single piston solution lies lightening piston reduce mass can best accom plished drilling multitude lightening holes though top piston may find will have decreasing effect compression engine lithe cylinder tightly clamped large vise overnight will find c6mpression has greatly restored use little trick engines have terrific compression engine head removed Another method counteract mass single piston overbalance prop blade opposite piston can done Scotch-taping fishing weights back side blade attach front looks bad hope find tips helpful Rudder Brudder chatting Jim Medley Conyers GA Huntsville AL contest asked ilL intersted building ideas column course always am proceeded tell about technique usese wing horizontal stabilizer tips alleviate effects hangar rash familiar damaged tips result bump ing relatively soft balsa usually Continued page 110 November 1980 33 Frank also scored best flight meet aided 15% bonus last round Standoff flown late fourth day after F4C round wind magically died flights expected trend toward complex planes take advantage bonuses has yet developed Only two F4C biplanes Knowles Tiger Moth Lennas Curtiss XSBC-4 re ceived 15% bonus others 5 10% class relatively simple planes Two years ago Woodvale twin appeared Ottawa two twins Standoff Complex twins require power fly safely pair of30 engines 60 total maximum F4C until 1983 does attract modelers George Roses Curtiss Hawk P6-E leader after first day flying Planes severely damaged wind included folding-wing Westland Widgeon Australia flown Ross Woodcock Cessna Bird Dog L-19 Gerry Fingler Bird Dogs complete exterior constructed molded ABS plastic sheetwhich included much detail such rivets though badly damaged flown following day no apparent visible blemishes Widgeon did fly again repairable Bob Underwoods new Hiperbipe replace ment lost 79 NATS suffered its first flight because poor engine run prompted Bob change engines improvement apparent later flights Mick Reeves Spitfire lost its lower engine cowl soon after takeoff rule requires model flown judged took effect give him zero score first flight Mick designed novel method cooling completely cowled HP 61 engine Air taken scoop under cowl ducted forward concerned about cooling effect weather should turn really hot system successful Mick entered two Spitfires class Third highest static score F4C awarded Joe McCollums Volksplane VP2 cockpit model pilot remarkable resemblance Joe including beard mous tache Inside Wee Joe called servos operate stick rudder pedals connected wires elevator rudder pilot flew plane feature gave Joe high ingenuity points VP2 detailed completely CAP 20 Jean Rousseau received highest static score factor eventually led first place finish Jean competitor use gear-reduction Webra engine Cooling became problem CAP Jean removed dummy engine obstructed air flow dis covered judges first flight lost result portion dummy engine replaced satisfy rule against removing thing after static judging engine over heated crucial third flight last meet plane dead- sticked landing just short circle appeared could spoil chance first place final day F4C flights George Rose first fly relative calm early morning high score flight put him apparent first place until Rousseaus score posted meets end latter emerged winner -point over Rose could have climactic ending least three model entries appearing third World Championships Rene Fouquereaus CAP 20 Bob Wischers Piel Beryl Terry Mellenys deHavilland Moth Minor best weathering job have ever seen nine-year-old P-Si B David Vaughan look well-used fighter missions Fournier Duncan Hutson homemade retract mechanism folding wings on-board engine starter in-the-air restarts Fournier few planes can use starter advantage flight option because practice used proto type Four entries models homebuilt planes Judges F4C Johnnie Carroll Ireland Paul Jones Canada Herbert Steinhauer West Germany Serge Zwahlen France John Preston US Judges Standoff Scale Dick Carson US Stephan Gray Canada John Preston U S Peter Merrick Canada ceremony memory Glen Sigafoose day funeral news death came shock attendance modeling fraternity owes debt gratitude Sigs shirts worn F4C team gifts Sig shirts received other World Champion ships RC Giant Scale/Beckman Continued page 31 would expect other words has standard model building techniquescomfort able us part adequate lower end Giant Scale range plans well-drawn clear suf ficient detail experienced modeler would recommend beginner youve experience built-up sheeted fuselage wing construction youll have no trouble understanding Dons plans Cowls canopies can problem big birds cowl built-up balsa ply shown plans should quite effective No information provided canopy hut mostly simple curves could made sheet plastic believe includes wind shield compound curve aftermost section possible section cut large bubble canopy would suitable Don may have canopy available time read warning several fittings control horns etc depend solder joints Although plans specify hard soldering brazing opinion necessary Soft solder so-called silver solders like Sta-brite have strength required summary Dons plans adequate experienced modelers lack detail needed beginners Built shown model should fairly light perform well Quadra similar engine Order Aero Plan 101 SW 2nd St Pompano Beach FL 33060 notes dont include price believe about $20 Future plan reviews presently have eight sets plans waiting line Its obvious now wont have time column space available until after flying season meantime what have hand listed below anyone interested particular plan cant wait send SASE Ill tell what can about list A-scale Liberty Sport Bucker Jungmeister Wendell Hostetler 1/ scale Druine Turbulent Doug MacBrien 275 scale Curtiss P-40E Bob Morse -scale Fairchild PT-19 Jim Folline -scale Piper L-4B Ken Runestrand 1 ft 1 meter scale Fokker DVIII Bill Wendt -scale Ercoupe Jim Messer Bob Beckman 8248 Holly Grove Ct Manassas VA 22110 703 369-2432 RC Aerobatics/Van Putte Continued page 33 used technique Jim described very easy implement resulted un believable improvement ding resis tance tips new Phoenix 8 After foam wing sheeted flat piece balsa glued tip mark straight line along center tip airfoil 110 Model Aviation section balsa piece mark two parallel lines 1/32-in either side center line Cut piece 1/16-in plywood planform shape tip installed Using cyanoacrylate glue like Hot Stuff Zap Jet glue plywood piece balsa plate perpendicular tip aligned parallel lines youve just drawn Cut two soft balsa blocks roughly shape glue plate plywood Now sand tip shape Youll note plywood piece makes great template sanding youre done can hardly see plywood However first time ding tip youll probably have damage Great idea know idea new based what Ive heard since new thank Jim As written final stages completing work new Phoenix 8 Nats nine days finish airplane test fly make necessary trim adjustments get some practice before leaving Wilmington OH years will finish airplane sufficient time wont have excuses performance competition Ron Van Putte 12 Connie Drive Shalimar FL 32579 RC Soaring/Pruss Continued page 35 launch bad air Winches open after initial rotation selected via draw Fliers called allowed launch pass once given choices winches open contest slept Briefing wasnt until 9 oclock first launch ******** ** * * * * **** * *** Test Run Engine FOX 19-RC * 15000 rpm 8-4 * Weight 5-112 ounces * Bore 650 * Stroke 600 * Displacement 19 Fox 19 RC $4195 Fox Silencer available fit No 90222 Size B @ $795 American-Made Engines Its just plain bearing engine saves lots bucks FOX 19 delivers power greater baffle 19 have ever testedand sur passes some Schneurle 19 engines Ball bearings nice fancy carburetors neat price no oblect time-proven powerplant runs throttles idles league 19s costing twice price Thats lot save Its find Fos products field flying action ia Hot Line 501 6461656 CO 5305 TOWSON AVE FORT SMITH ARK 7201 F uthorized %dio r ontro ervice FACTORY AUTHORIZED SER VICE FOR ALL OF THE FOLLOWING BRANDS Ace Aero Sport Cannon Cirrus Kraft World Engines EK Logictrol Micro Avionics Pro Line Orbit Msthes* D&D RS Systems Royal Simprop * Jerobee *ALSO WARRANTY SER VICE EXPERTSER VICE FOR ALL BRANDS Don McCarthy Factory trained technicians over 15 years Radio Control Electronics 0 HOURS Closed Sun & Mon lOam-8 pmWedFri 10 am-6pm Sat 10 am-2 pm 714 639-8886 941 N MAIN ST. ORANGE CALIFORNIA 92667 November 1980 1 1 1 Lubricants. An Imnortant items $2 19 unless otherwise noted Motor Oil Lgt* #102Gear Lubricant #104Synthetic lnstr /Motor Oil Med #106Grease Fortified W/Teflon #107Motor Oil Medium #108Motor Oil Light #111Light Oil #134Powdered Teflon Dry Lttbricant #135Powdered Graphite Dry Lubricant *Not Use Plastics ElIMm Igcene unduyour dealer about us stries P0 Box 328 Bensenville IL 60106 Ralph Learmont Kestrel 17 avail able kit form spans 1684 weighs 8 lb information article