C COMBAT Charlie Johnson ACTUALLY did what said going last column some scientific testing several offers loan hot-air-powered wind tunnels decided go trusty camera height pole expendable airplane two camera makes permanent film record proceedings expendable air plane nice because can just crash finish testing sequence height pole really necessary use film dimensions figure everything 52 feet camera 58-mm lens covers area 30 feet 20 feet can mark convenient building curb 1 -foot increments using magic marker master slide negative projected enlarger base board dining room wall transfer grid fun games may make forget model airplanes take up photography full-time occupation testing now know doggy FAI will turn 60 loops per minute less 8-foot radius loops Get picture plane real dog combination means plane covered about 3014 feet minute about 36 mph average Well its top speed about 75 mph anyway Any plane turns less 100 loops per minute certainly going set world fire good AMA-type combat plane ran through course 100 loops per minute about 4-foot radius Looked pretty good thats 2512 feet minute 314 times diameter 8 feet times 100 loops Before deciding reprogram calculator mile would equal less 5280 feet tried doing bigger loops Still could 100 loops per minute larger 6-foot radius Looks easy enough pick couple loop diameters count loops per minute plot performance curve just like big-time engineers bought French curve help making neat curvy graphs see engineering magazines Before going Ill give couple tips testing plane First dont minutes worth loops Use stopwatch time 10 loops figure camera winder really necessary either Get some slow ASA 25 film stop lens way down plus neutral density filters can use shutter speed about nd Late afternoon sun setting ideal have hurry through tests Set exposure background plane will underexposed blun zooming around can get very good idea just fly loops using height pole observer Last thing use camera method camera should right next circle outside circle plane exactly halfway between pilot also high enough avoid parallax problems roof motor home pickup truck perfect What will newfound knowledge tor Nothing directly Its apply know ledge best pilots already have knowledge although might never able tell what loop radius speed theyre flying ability get plane through maneuvers fastest way possible due seat-ofthe-pants flying skill very easily matched computer once performance curve pro grammed Imagine super Atari combat game combat flight simulator pick favorite electronic model something like line tension could programmed Could boring average combat hacker before start checking density Hot Stuff new micrometer ill move something else know youll like New spar material Hi-Flite Model Products 43225 Whittier Ave Hemet CA 92343 foanVcarbon-fibre laminate called Slight-Spar claim light spruce times stronger list five different sizes /4 x g 1/4 x ize available 36 48 lengths samplesnot full length really rigid possibly hot tip holding together ultimate design workshop No price info samples either claim spars should hobby shop time read Whats new almost-ready-to-fly buy em category Phil Cartier announced new 24-oz 400-sq-in Slow ship features replaceable wings foam can changed about 10 minutes have order hope performance test next column flying part changing wings Price should around $30-35 Continued page 112 Winners AA b Beardon2 Jerry Sabin1 Page Peterson ng save Lnrls nays Fast Comb. hip after ground pounding Note Photo taken Bob Werle during MACA Championships Combat Spacialties flite pack 44 Model Aviation Joroan egal Paul Smith go final match FAI MACA Championships Werle pic Posing Boba lena MACP John Frank Tigre-poweredNemesis Features straightened airfoil after highpoint different rib spacing cigar box cedar booms plus counter-balanced stabilizer WWI MODEL ACCESSORIES FINE QUALITY MACHINE GUN KITS JLLOAJS mLINc class should go acquisition certain number first second third places contests should figure point award based number competitors contest place competitor finishes finally should continue attempt keep scoring average fliers Some systems rely someone keep records Can expect AMA headquarters what about numerous contest administrators never send results Stunt News can hope send results AMA headquarters final problem PAMPA categories whether should include Nationals categories Nationals utilized course last Nationals saw 46 Open entries nearly half qualifiers since 20 flew Finals day Yes thats right last day really called Finalfinals day Walker Cup day informaton stunt P4MPA write WvnnPauh 1640 Maywick Dr Lexington KY 40504 WHEELS TS INGS SEND 50t FOR COMPLETE CATALOG DEPT MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA 9 BARRONS L E C ASS IC S CL Combat/Johnson continued page 44 rye hearing about new proposed event called Speed Pattern Oh God another event say Sounds less destructive Combat easier Speed precision maneuvers Aerobatics Bob Hunt Mike 1-loffelt promoting event think would good idea two promote years Nationals event goes something like uncowled 40-powered model circulating astounding speeds 60-foot lines signal judge ready model streaks downwind marker judge starts stopwatch As finish first timed lap three inside loops continue around level lap three outside loops same downwind area same level lap used between next three horizontal-eights vertical-eights watch being stopped marker following level lap after vertical-eights Dog FAI did course 24 seconds AMA plane 15 course FAI less distance travel maneuvers would done designated window downwind keep pilot flying over sky Horizontal placement critical whereas vertical framing isnt can fly maneuvers tall want Sounds would least make fun event club meetings Well let 135-mph fire-breathers take over becomes national event event would offer challenge engine man plane designer super pilot would try trim down elapsed time through area proficiency Lets encourage Mike Bob sponsor event year some club level give try figure have give try event worthwhile will perpetuate itself whereas no amount fiddling rules would thing aid its popularity Makes think about long-forgotten Texas combat flier 1952 invented mid-air collision look what thats done rules-making combat general Charlie Johnson 3716 Ingraham St San Diego C4 92109 CL Racing/Lee continued page 45 generated lift wings example Big Goodyear Ac= 115 Gs Accos145 115 x9681 111 Gs Alt in 145 115 x25 29 Gs FIGURE 3 Ac ripetal acceleration Gs Acceleration transmitted through lines Al AccosGAl Ac e AtAg Alt Lift acceleration keep plane altitude Ac sin cceleration balancing Ag Ag Acceleration due gravity e Angle lines make horizontal wing must produce 29 Gs lift just counteract component centripetal force cannot transmitted via lines addition lift necessary support aircraft Al s since lift created perpendicular wing lift neces sary produce 10 G ofvertical force 0/cos0 Hence total lift produced wing Lift 104 Gs almost four times much lift needed 15 feet above handle handle height Quite lot lift needed fly high lift creates drag causes airplane slow down rational explanation see speed fliers actually flying below level pylon going faster because What force acts fuel system flying above handle level Actually same conditions apply applied before slight changes quantity fuel tank sees force acting outward downward Using Big Goodyear example fuel sees about 115 Gs force acting about five degrees below horizon tal big change body tank 112 Model Aiiation ENGINE KITS & CYLINDERS Rosies D&R Fbwer Pod Fits CDX T- D & Med 049 051 Engs Rubber Band Screw Mounting Eng mts upright Inverted Running time appx 4 mm Nylon injection mouldedColors Power 3 lb airplanes total weight 3M OL$595RED BLACK WEYELLOW ALSOORANGE MAKE BANTAM ServosWrite D&R SticksFor Free Connectors Bulkhead SwitchCatalog mountsFin Products ch jeavy duty gear Woid oda *siua D otha fin pveducu 3501-B W Moore St Santa Ana CA 92704 PLANS & cONsTR MANUAL Curtiss Hawk PGE Stinson Reliant SR9 I/4SCALE 94SSP $2250 SASCALE 126SP $2500 2SCALE B3SPAPE 51250 2SCALE S4SPAN $1500 23SCALE 47l/4SF$1050 15sCALr 6iSPAN $1250 Curtiss FIIC2 Curtiss Gulthawk IA ShScALE 54SSP $3000 1MSCALE 945SP $3000 2SCALE 03SP $1500 2SCALE C3SP $1500 PLEASE ADD *200 0RP/H USASEND $100 WRITE row MAE LINO IT7 t INrORMATION INCLUDE $100CATALOGE row CATALOOE 1213 HOLLY Spmoe LANE GRAND BLANC Mi 40439 SAFE FLYING IS NO ACCIDENT
Edition: Model Aviation - 1980/03
Page Numbers: 44, 112
C COMBAT Charlie Johnson ACTUALLY did what said going last column some scientific testing several offers loan hot-air-powered wind tunnels decided go trusty camera height pole expendable airplane two camera makes permanent film record proceedings expendable air plane nice because can just crash finish testing sequence height pole really necessary use film dimensions figure everything 52 feet camera 58-mm lens covers area 30 feet 20 feet can mark convenient building curb 1 -foot increments using magic marker master slide negative projected enlarger base board dining room wall transfer grid fun games may make forget model airplanes take up photography full-time occupation testing now know doggy FAI will turn 60 loops per minute less 8-foot radius loops Get picture plane real dog combination means plane covered about 3014 feet minute about 36 mph average Well its top speed about 75 mph anyway Any plane turns less 100 loops per minute certainly going set world fire good AMA-type combat plane ran through course 100 loops per minute about 4-foot radius Looked pretty good thats 2512 feet minute 314 times diameter 8 feet times 100 loops Before deciding reprogram calculator mile would equal less 5280 feet tried doing bigger loops Still could 100 loops per minute larger 6-foot radius Looks easy enough pick couple loop diameters count loops per minute plot performance curve just like big-time engineers bought French curve help making neat curvy graphs see engineering magazines Before going Ill give couple tips testing plane First dont minutes worth loops Use stopwatch time 10 loops figure camera winder really necessary either Get some slow ASA 25 film stop lens way down plus neutral density filters can use shutter speed about nd Late afternoon sun setting ideal have hurry through tests Set exposure background plane will underexposed blun zooming around can get very good idea just fly loops using height pole observer Last thing use camera method camera should right next circle outside circle plane exactly halfway between pilot also high enough avoid parallax problems roof motor home pickup truck perfect What will newfound knowledge tor Nothing directly Its apply know ledge best pilots already have knowledge although might never able tell what loop radius speed theyre flying ability get plane through maneuvers fastest way possible due seat-ofthe-pants flying skill very easily matched computer once performance curve pro grammed Imagine super Atari combat game combat flight simulator pick favorite electronic model something like line tension could programmed Could boring average combat hacker before start checking density Hot Stuff new micrometer ill move something else know youll like New spar material Hi-Flite Model Products 43225 Whittier Ave Hemet CA 92343 foanVcarbon-fibre laminate called Slight-Spar claim light spruce times stronger list five different sizes /4 x g 1/4 x ize available 36 48 lengths samplesnot full length really rigid possibly hot tip holding together ultimate design workshop No price info samples either claim spars should hobby shop time read Whats new almost-ready-to-fly buy em category Phil Cartier announced new 24-oz 400-sq-in Slow ship features replaceable wings foam can changed about 10 minutes have order hope performance test next column flying part changing wings Price should around $30-35 Continued page 112 Winners AA b Beardon2 Jerry Sabin1 Page Peterson ng save Lnrls nays Fast Comb. hip after ground pounding Note Photo taken Bob Werle during MACA Championships Combat Spacialties flite pack 44 Model Aviation Joroan egal Paul Smith go final match FAI MACA Championships Werle pic Posing Boba lena MACP John Frank Tigre-poweredNemesis Features straightened airfoil after highpoint different rib spacing cigar box cedar booms plus counter-balanced stabilizer WWI MODEL ACCESSORIES FINE QUALITY MACHINE GUN KITS JLLOAJS mLINc class should go acquisition certain number first second third places contests should figure point award based number competitors contest place competitor finishes finally should continue attempt keep scoring average fliers Some systems rely someone keep records Can expect AMA headquarters what about numerous contest administrators never send results Stunt News can hope send results AMA headquarters final problem PAMPA categories whether should include Nationals categories Nationals utilized course last Nationals saw 46 Open entries nearly half qualifiers since 20 flew Finals day Yes thats right last day really called Finalfinals day Walker Cup day informaton stunt P4MPA write WvnnPauh 1640 Maywick Dr Lexington KY 40504 WHEELS TS INGS SEND 50t FOR COMPLETE CATALOG DEPT MA 0 181 PAWNEE STREET SAN MARCOS CALIFORNIA 9 BARRONS L E C ASS IC S CL Combat/Johnson continued page 44 rye hearing about new proposed event called Speed Pattern Oh God another event say Sounds less destructive Combat easier Speed precision maneuvers Aerobatics Bob Hunt Mike 1-loffelt promoting event think would good idea two promote years Nationals event goes something like uncowled 40-powered model circulating astounding speeds 60-foot lines signal judge ready model streaks downwind marker judge starts stopwatch As finish first timed lap three inside loops continue around level lap three outside loops same downwind area same level lap used between next three horizontal-eights vertical-eights watch being stopped marker following level lap after vertical-eights Dog FAI did course 24 seconds AMA plane 15 course FAI less distance travel maneuvers would done designated window downwind keep pilot flying over sky Horizontal placement critical whereas vertical framing isnt can fly maneuvers tall want Sounds would least make fun event club meetings Well let 135-mph fire-breathers take over becomes national event event would offer challenge engine man plane designer super pilot would try trim down elapsed time through area proficiency Lets encourage Mike Bob sponsor event year some club level give try figure have give try event worthwhile will perpetuate itself whereas no amount fiddling rules would thing aid its popularity Makes think about long-forgotten Texas combat flier 1952 invented mid-air collision look what thats done rules-making combat general Charlie Johnson 3716 Ingraham St San Diego C4 92109 CL Racing/Lee continued page 45 generated lift wings example Big Goodyear Ac= 115 Gs Accos145 115 x9681 111 Gs Alt in 145 115 x25 29 Gs FIGURE 3 Ac ripetal acceleration Gs Acceleration transmitted through lines Al AccosGAl Ac e AtAg Alt Lift acceleration keep plane altitude Ac sin cceleration balancing Ag Ag Acceleration due gravity e Angle lines make horizontal wing must produce 29 Gs lift just counteract component centripetal force cannot transmitted via lines addition lift necessary support aircraft Al s since lift created perpendicular wing lift neces sary produce 10 G ofvertical force 0/cos0 Hence total lift produced wing Lift 104 Gs almost four times much lift needed 15 feet above handle handle height Quite lot lift needed fly high lift creates drag causes airplane slow down rational explanation see speed fliers actually flying below level pylon going faster because What force acts fuel system flying above handle level Actually same conditions apply applied before slight changes quantity fuel tank sees force acting outward downward Using Big Goodyear example fuel sees about 115 Gs force acting about five degrees below horizon tal big change body tank 112 Model Aiiation ENGINE KITS & CYLINDERS Rosies D&R Fbwer Pod Fits CDX T- D & Med 049 051 Engs Rubber Band Screw Mounting Eng mts upright Inverted Running time appx 4 mm Nylon injection mouldedColors Power 3 lb airplanes total weight 3M OL$595RED BLACK WEYELLOW ALSOORANGE MAKE BANTAM ServosWrite D&R SticksFor Free Connectors Bulkhead SwitchCatalog mountsFin Products ch jeavy duty gear Woid oda *siua D otha fin pveducu 3501-B W Moore St Santa Ana CA 92704 PLANS & cONsTR MANUAL Curtiss Hawk PGE Stinson Reliant SR9 I/4SCALE 94SSP $2250 SASCALE 126SP $2500 2SCALE B3SPAPE 51250 2SCALE S4SPAN $1500 23SCALE 47l/4SF$1050 15sCALr 6iSPAN $1250 Curtiss FIIC2 Curtiss Gulthawk IA ShScALE 54SSP $3000 1MSCALE 945SP $3000 2SCALE 03SP $1500 2SCALE C3SP $1500 PLEASE ADD *200 0RP/H USASEND $100 WRITE row MAE LINO IT7 t INrORMATION INCLUDE $100CATALOGE row CATALOOE 1213 HOLLY Spmoe LANE GRAND BLANC Mi 40439 SAFE FLYING IS NO ACCIDENT