Combat SOME SAY Combat luck guys win time claim 100% skill put top Both points well taken youre good enough can make own luck aided technical knowledge bit cunning sometimes large outlay cash Lets assume nationally competitive fliers like Howard Rush Dan Stubblefield flying 90% luck-free state maybe rest us 50% level novice still struggling eliminate 75% chance Obviously figures sake following argument that first move becoming better Combat flier put hopes super engines air planes developing physical emo tional intellectual capacities Youll have lot gain adding 2 mph decreasing turn radius foot Go local public library borrow good book becoming race car driver Model airplane fly ing requires same skills sometimes greater though penalty error losing match airplane opposed wreck ing car eventual level competitiveness will determined much time money effort will put activity nothing return guaranteed think flying Com bat way self expression have fun doing have determination become better follow steps 1 Admit yourself equipment better decently built Nemesis Charlie Johnson flies better 90% fliers country capable flying other planes share claim too just find fancy build lots because easy part 2 Put body shape Start regular exercise program work co-ordina tion Fat sluggish bodies little endurance arent going make youre serious about becoming best youll continued page 77 Englishman Richard Wilkins 400 sq FAI Combat visit US ha made outstand ing impression English design approach Below Comparison Wilkins ship typical US plane photos Lorna Samuel Scale IMPORTANT decision has just taken place rules judging CL Scale Basically changes flight points could affect model building future competition pro posed changes feel present rules too heavily weighted favor static points given resulted over-emphasis certain options favored type feature over another So make point read rules listed below note changes will Mike Stott able choose right model modify building take advantage new rules go effect first January 1976 447 Scale Operations Six optional demon strations shall selected following list Optional selections must announced judges before take-off operations must accomplished during models offi cial flight No points shall awarded unless operation complete Multi-engines 20 points will given use engine providing engines running take-off continue run least 10 laps Loss points individual engine stoppage will given according number laps affected No points will given Jetex-type engines b Retract extend landing gear 20 points cLower raise flaps0 20 points d Lower close bomb hay doors 0 20 points eDrop bombs0 20 points Bombs other droppable stores must made balsa hollow fiberglass plastic No sharp points hardwood metal construc tion allowedcontinued page 76 January 1976 33 Line-up AMA Scale jobs Nets foreground Cathy Burnstines Liberty Sport behind Ralph Burnatines F4B Chris Joiner pic What goes hero Pull-testing DIII I1arneys Hughes XF-11it weighs 13 1/4 lbsseems take three muscular anchor men landings Two-minute precision flights have made creditable 15 cumulative scores reached novice can reach achievements week-end flier gives him confidence tending first contest flier realizes has get together contest knowing able before has stimulate individuals giving go against local state national champion Secondly flexibility particular tasks ie duration 6-10 minutes precision 2-3 min utes landing zonesspeed/distance has allowed contest managers select tasks best suited own conditions same flexi bility has further kept contests becoming routine opinion current flavor tasksspeed/distance duration precision flying can maintained existing accepted flexibility would best interests sport past contest season attests way thinking Witness LSF Tournament its speed/distance task designed Donelson/ Hahn Michigan State Championships 24-minute cumulative3 round task no flight over 10 minutes penalized feature CD Gordon Pearson claimed widely accepted point modifications tasks introduced presented because serve new need purpose Although variations theme often have also refinements CDs contest planners have taken few liberties rule book same people have added new dimensions competition modifica tions have seldom caused unpleasant air above have encouraged discouraged newcomer climb ring LSFShortlines Membership October past 1600 west country join Czech oslovakia w soaring oking added challenge in LSF Send letter intent form League Silent Flight Dept M PO Box 39068 Chicago IL 60639 Include stamped self-addressed envelope address Rt 2 Box 490 Plainfield Ill 60544 3 Work concentration After fivemile run try flying AMA Stunt Pattern best Combat ship Develop ability block out pain exhaustion think about making correct decision Fly enough practice going both upright inverted overcome tendency become dizzy beginner intermediate goes route will find progress somewhat slower tedious just built bunch planes went out bash everybody end will acquire far greater level proficiency Professionals practice first compete Combat events low cost fun event can found class Rules vary through out country basically use 049 en gines 25- 40-foot lines California fly rule hut nobody knows what little devils require lot patience times suggested ulcer-prone author has 049s sale very sophisticated event found FA Combat flown international level US flown like 15-size AMA Combat will change World Cham pionships including Combat held scramble place US Team gets underway third class proclaimed decree Sunday flier special Slow Combat generally easiest place start beginner often left Junior Senior age contestants Slow Com bat will soon become new battle ground model designer because its place better plane advantage spectacular splatter Fast Combat high power high appeal event because last AMA events really no restrictions Once engine airplane hackers delight event has lost some its appeal because high horsepower ultra-trick airplanes became synonymous big-hole-in-ground falling pieces de cide design own plane sure give trick name can name after yourself win Nationals getting body mind airplanes shape can decide classes com pete also involved youll become local regional meets year throughout country well Nationals really flying might consider attending international meet like British National Championships Dutch International Spaarndam have great regional differences US noth ing like Europe attending international meeting youll rewarded experiences will give whole new perspective model flying 1974 Europeans got look American horsepower took K&B 40-powered Nemesis over some exhibition flights Yanks got first hand look I-l MOVINGLET US KNOW COMPLETETHISWhen WHERE YOU ARE GOINGI move please let us know advancesix weeks re CARD AND ATTACHquired change address Attach current MA mailing label I MAILING LABEL space cheek appropriate box below mail FROMA RECENTSubscription Dept Model Aviation 806 Fifteenth St. NW IISSUEWashington DC 20005I ICheck appropriate boxenclose paymentI 0 CHANGE OF ADDRESS0 NEW SUBSCRIPTION Non-AMA subscription rates $1200 12 months Canada United States posses sions elsewhere $1400 Membership AMA includes subscription see separate applica-I tion issueI NAMEI ADDRESSI CITY/STATE71 P___________________ LMODEL AVIATION 806 FIFTEENTH ST. NW. WASHINGTON DC 20005 January 1976 77 CL Combat/Johnson continued page 33 WANTED ideas happenings hints/kinks howto sketches photos news etc Send colum nist category concernedat address shown column photo idea printed Model Aviation will pay $5 contributor NEWNEWNEW NEWNEWNEW NEWNEWNEW Custom blended12 Volt Fuel Pump Oper Bill Hagerate 12v starting Sport RC Pylon Racingbattery Economy pump12 Volt Starting Battery 55 blends Castor Klotz oil$1095 Deluxe pump withamp Ideal use blends FAI 700/0leads switch fuel linenew 12v fuel pump nitro$1295any 12v starter $1320 Harrys Hobbies IncPhone 513 276-5898 5224 North Dixie DriveDealer inquiries invitedDayton Ohio 45414 CL Combat continued Englishman Richard Wilkens years Nationals Richard gave Ameri cans treatment made us think about might match up against other British European fliers doubt neither Rich ard nor myself changed minds fliers got chance see things done differently technical scene reported Ron Sheldon Tony Guest coming close making Fox Schnuerle truly competitive engine others throughout country working parallel courses reports over indicate things look promising Supertigre took Tom Uptons advice re designed G21-35BB new Combat Special K&B has introduced new 35 aimed sport market addition 4OBB front-end peripheral jet venturi about fastest out box engine going FAI Combat has another escal FAI Combat has another esca lation horsepower sophistication Die hard British diesel fliers have switched Rossi diesels now keeping up G20 GIS Glow boys switch Rossi glows new kind contest works Southern California Special Pro Combat Association will hold its first contest San Diego December 7th contestants will fly minimum four rounds will invitation Bellcrank artists poor sports full-time line tanglers will invited AMA makes provision such contests offering Class B sanction type contest has tried past worked successfully less 30 entries would like send pictures comments just complaints may reached 3716 Ingraham St San Diego Calif 92109 714 273-6530 RC Helicopters/Schoonard continued page 19 point pet engine will show its ugly face will have tweak needle valve order get enough power under sustained collective setting will heat up start drop off power curve have good powerful engine its power output will crease during increased collective settings trial error process will have em ployed get tail-rotor pitch mix set tings proper start set tail-rotor pitch per manufacturers instructions tail-rotor mix 40-60 percent relationship tail-rotor mix needs adjusted add collective proper tail-rotor pitch added proper time little time spent will very rewarding later turn machine loose will go straight up tail swinging around have achieved will end result up side power curve constant blade speed proper mix relationship have seen lot people heard about lot can control tail rotor revert gyros kinds devices neces sary fact gyro wont help much underpowered out-of-trim helicopter may become too popular making kind statement truth helicopters have demonstrated rapid take-offs rapid de scents rock steady hands-off hovering wind Lately have flying Schluter Heli Baby little marvel flies hands off kinds weatheryes tail will fly hands off am really excited about rugged helicopter couple weeks ago show ing off stalled hit ground really hard about 60 feet bounced end over end like football damage bent output shaft side frames blade hold ers straightened parts replaced main blades flew right off super helicopter learn fly Next months column going deal Goodies Gadgets Such things heli copter Insurance both flight ground other equally exciting subjects column needs pictures creations espe cially incorporates some unique features Please direct correspondence RC Helicopt ers care Walt Schoonard 2080 Sharon Road Winter Park Fla 32789 RC Scale/Atkinson continued page 19 airplane attracted reason another has some fascination An other reason wanting build particular airplane will adapt well RC scale model first consideration powerplant just large want 45 60 pow ered Most Scale AMA Stand-off competition should 60-powered bird course extra detailing retracts used will give much higher wing loading say pattern sport bird Next course ob tain much information possible subject good set three views must make building plans its Stand-off Scale modifications can made insure better flying model changing outline too much aerodynamics involved scratch build ing scale model would make sizeable book may get part later articles best ways draw up scale model use other successful models starting point such good kit scale plans magazines Most standard airplanes ordinarily about same simply continuation other course exceptions Most WW II air craft basically same configuration de pending roles played such fight ers bombers dive-bombers reconnaissance etc over lay Spitfire P-SI ME109 Japanese Tony Macchi 202 would surprised moments would compa rable also true radial-engine fighter Probably prime factor good scale model proper airfoil fullsize aircraft cannot easily use full-size airfoil P-SI used high-speed lami nar section sections have used Goodyear models stay away scale unless want bomb land Most symmetrical laminar airfoils much too fast will comfortably adapt scale model wing loading naturally going higher Probably among best used air foils scale models 2400 series 2412 2415 very good scale sections last two numbers refer thickness other words 2412 has 12% thickness highest point lift about 35-40% leading edge percentage under 12% usually too thin retracting gear air craft will need least 14-15% hide wheels wells course may thicken thin leading edge gives model scale look its exceptions bi planes much thinner section may used such 9-10% Keep section thick enough support spars believe scale bipes have built-up wings have foam wings Usually trying simulate fabric-covered wing stab elevator should always symmetrical slab type airfoiled symmetrical wood foam full symmetrical stab much cleaner produces less drag slab type easier build align Both will work OK scale models good safe-size stab 18 20% total wing area total stab elevator course will go aerodynamics scratch-built scale bird later columns 78 Model Aviation Wilkens AMA-size Combat job has 460 sq area loam tips Weighs 18 oz ST 35
Edition: Model Aviation - 1976/01
Page Numbers: 33, 77, 78
Combat SOME SAY Combat luck guys win time claim 100% skill put top Both points well taken youre good enough can make own luck aided technical knowledge bit cunning sometimes large outlay cash Lets assume nationally competitive fliers like Howard Rush Dan Stubblefield flying 90% luck-free state maybe rest us 50% level novice still struggling eliminate 75% chance Obviously figures sake following argument that first move becoming better Combat flier put hopes super engines air planes developing physical emo tional intellectual capacities Youll have lot gain adding 2 mph decreasing turn radius foot Go local public library borrow good book becoming race car driver Model airplane fly ing requires same skills sometimes greater though penalty error losing match airplane opposed wreck ing car eventual level competitiveness will determined much time money effort will put activity nothing return guaranteed think flying Com bat way self expression have fun doing have determination become better follow steps 1 Admit yourself equipment better decently built Nemesis Charlie Johnson flies better 90% fliers country capable flying other planes share claim too just find fancy build lots because easy part 2 Put body shape Start regular exercise program work co-ordina tion Fat sluggish bodies little endurance arent going make youre serious about becoming best youll continued page 77 Englishman Richard Wilkins 400 sq FAI Combat visit US ha made outstand ing impression English design approach Below Comparison Wilkins ship typical US plane photos Lorna Samuel Scale IMPORTANT decision has just taken place rules judging CL Scale Basically changes flight points could affect model building future competition pro posed changes feel present rules too heavily weighted favor static points given resulted over-emphasis certain options favored type feature over another So make point read rules listed below note changes will Mike Stott able choose right model modify building take advantage new rules go effect first January 1976 447 Scale Operations Six optional demon strations shall selected following list Optional selections must announced judges before take-off operations must accomplished during models offi cial flight No points shall awarded unless operation complete Multi-engines 20 points will given use engine providing engines running take-off continue run least 10 laps Loss points individual engine stoppage will given according number laps affected No points will given Jetex-type engines b Retract extend landing gear 20 points cLower raise flaps0 20 points d Lower close bomb hay doors 0 20 points eDrop bombs0 20 points Bombs other droppable stores must made balsa hollow fiberglass plastic No sharp points hardwood metal construc tion allowedcontinued page 76 January 1976 33 Line-up AMA Scale jobs Nets foreground Cathy Burnstines Liberty Sport behind Ralph Burnatines F4B Chris Joiner pic What goes hero Pull-testing DIII I1arneys Hughes XF-11it weighs 13 1/4 lbsseems take three muscular anchor men landings Two-minute precision flights have made creditable 15 cumulative scores reached novice can reach achievements week-end flier gives him confidence tending first contest flier realizes has get together contest knowing able before has stimulate individuals giving go against local state national champion Secondly flexibility particular tasks ie duration 6-10 minutes precision 2-3 min utes landing zonesspeed/distance has allowed contest managers select tasks best suited own conditions same flexi bility has further kept contests becoming routine opinion current flavor tasksspeed/distance duration precision flying can maintained existing accepted flexibility would best interests sport past contest season attests way thinking Witness LSF Tournament its speed/distance task designed Donelson/ Hahn Michigan State Championships 24-minute cumulative3 round task no flight over 10 minutes penalized feature CD Gordon Pearson claimed widely accepted point modifications tasks introduced presented because serve new need purpose Although variations theme often have also refinements CDs contest planners have taken few liberties rule book same people have added new dimensions competition modifica tions have seldom caused unpleasant air above have encouraged discouraged newcomer climb ring LSFShortlines Membership October past 1600 west country join Czech oslovakia w soaring oking added challenge in LSF Send letter intent form League Silent Flight Dept M PO Box 39068 Chicago IL 60639 Include stamped self-addressed envelope address Rt 2 Box 490 Plainfield Ill 60544 3 Work concentration After fivemile run try flying AMA Stunt Pattern best Combat ship Develop ability block out pain exhaustion think about making correct decision Fly enough practice going both upright inverted overcome tendency become dizzy beginner intermediate goes route will find progress somewhat slower tedious just built bunch planes went out bash everybody end will acquire far greater level proficiency Professionals practice first compete Combat events low cost fun event can found class Rules vary through out country basically use 049 en gines 25- 40-foot lines California fly rule hut nobody knows what little devils require lot patience times suggested ulcer-prone author has 049s sale very sophisticated event found FA Combat flown international level US flown like 15-size AMA Combat will change World Cham pionships including Combat held scramble place US Team gets underway third class proclaimed decree Sunday flier special Slow Combat generally easiest place start beginner often left Junior Senior age contestants Slow Com bat will soon become new battle ground model designer because its place better plane advantage spectacular splatter Fast Combat high power high appeal event because last AMA events really no restrictions Once engine airplane hackers delight event has lost some its appeal because high horsepower ultra-trick airplanes became synonymous big-hole-in-ground falling pieces de cide design own plane sure give trick name can name after yourself win Nationals getting body mind airplanes shape can decide classes com pete also involved youll become local regional meets year throughout country well Nationals really flying might consider attending international meet like British National Championships Dutch International Spaarndam have great regional differences US noth ing like Europe attending international meeting youll rewarded experiences will give whole new perspective model flying 1974 Europeans got look American horsepower took K&B 40-powered Nemesis over some exhibition flights Yanks got first hand look I-l MOVINGLET US KNOW COMPLETETHISWhen WHERE YOU ARE GOINGI move please let us know advancesix weeks re CARD AND ATTACHquired change address Attach current MA mailing label I MAILING LABEL space cheek appropriate box below mail FROMA RECENTSubscription Dept Model Aviation 806 Fifteenth St. NW IISSUEWashington DC 20005I ICheck appropriate boxenclose paymentI 0 CHANGE OF ADDRESS0 NEW SUBSCRIPTION Non-AMA subscription rates $1200 12 months Canada United States posses sions elsewhere $1400 Membership AMA includes subscription see separate applica-I tion issueI NAMEI ADDRESSI CITY/STATE71 P___________________ LMODEL AVIATION 806 FIFTEENTH ST. NW. WASHINGTON DC 20005 January 1976 77 CL Combat/Johnson continued page 33 WANTED ideas happenings hints/kinks howto sketches photos news etc Send colum nist category concernedat address shown column photo idea printed Model Aviation will pay $5 contributor NEWNEWNEW NEWNEWNEW NEWNEWNEW Custom blended12 Volt Fuel Pump Oper Bill Hagerate 12v starting Sport RC Pylon Racingbattery Economy pump12 Volt Starting Battery 55 blends Castor Klotz oil$1095 Deluxe pump withamp Ideal use blends FAI 700/0leads switch fuel linenew 12v fuel pump nitro$1295any 12v starter $1320 Harrys Hobbies IncPhone 513 276-5898 5224 North Dixie DriveDealer inquiries invitedDayton Ohio 45414 CL Combat continued Englishman Richard Wilkens years Nationals Richard gave Ameri cans treatment made us think about might match up against other British European fliers doubt neither Rich ard nor myself changed minds fliers got chance see things done differently technical scene reported Ron Sheldon Tony Guest coming close making Fox Schnuerle truly competitive engine others throughout country working parallel courses reports over indicate things look promising Supertigre took Tom Uptons advice re designed G21-35BB new Combat Special K&B has introduced new 35 aimed sport market addition 4OBB front-end peripheral jet venturi about fastest out box engine going FAI Combat has another escal FAI Combat has another esca lation horsepower sophistication Die hard British diesel fliers have switched Rossi diesels now keeping up G20 GIS Glow boys switch Rossi glows new kind contest works Southern California Special Pro Combat Association will hold its first contest San Diego December 7th contestants will fly minimum four rounds will invitation Bellcrank artists poor sports full-time line tanglers will invited AMA makes provision such contests offering Class B sanction type contest has tried past worked successfully less 30 entries would like send pictures comments just complaints may reached 3716 Ingraham St San Diego Calif 92109 714 273-6530 RC Helicopters/Schoonard continued page 19 point pet engine will show its ugly face will have tweak needle valve order get enough power under sustained collective setting will heat up start drop off power curve have good powerful engine its power output will crease during increased collective settings trial error process will have em ployed get tail-rotor pitch mix set tings proper start set tail-rotor pitch per manufacturers instructions tail-rotor mix 40-60 percent relationship tail-rotor mix needs adjusted add collective proper tail-rotor pitch added proper time little time spent will very rewarding later turn machine loose will go straight up tail swinging around have achieved will end result up side power curve constant blade speed proper mix relationship have seen lot people heard about lot can control tail rotor revert gyros kinds devices neces sary fact gyro wont help much underpowered out-of-trim helicopter may become too popular making kind statement truth helicopters have demonstrated rapid take-offs rapid de scents rock steady hands-off hovering wind Lately have flying Schluter Heli Baby little marvel flies hands off kinds weatheryes tail will fly hands off am really excited about rugged helicopter couple weeks ago show ing off stalled hit ground really hard about 60 feet bounced end over end like football damage bent output shaft side frames blade hold ers straightened parts replaced main blades flew right off super helicopter learn fly Next months column going deal Goodies Gadgets Such things heli copter Insurance both flight ground other equally exciting subjects column needs pictures creations espe cially incorporates some unique features Please direct correspondence RC Helicopt ers care Walt Schoonard 2080 Sharon Road Winter Park Fla 32789 RC Scale/Atkinson continued page 19 airplane attracted reason another has some fascination An other reason wanting build particular airplane will adapt well RC scale model first consideration powerplant just large want 45 60 pow ered Most Scale AMA Stand-off competition should 60-powered bird course extra detailing retracts used will give much higher wing loading say pattern sport bird Next course ob tain much information possible subject good set three views must make building plans its Stand-off Scale modifications can made insure better flying model changing outline too much aerodynamics involved scratch build ing scale model would make sizeable book may get part later articles best ways draw up scale model use other successful models starting point such good kit scale plans magazines Most standard airplanes ordinarily about same simply continuation other course exceptions Most WW II air craft basically same configuration de pending roles played such fight ers bombers dive-bombers reconnaissance etc over lay Spitfire P-SI ME109 Japanese Tony Macchi 202 would surprised moments would compa rable also true radial-engine fighter Probably prime factor good scale model proper airfoil fullsize aircraft cannot easily use full-size airfoil P-SI used high-speed lami nar section sections have used Goodyear models stay away scale unless want bomb land Most symmetrical laminar airfoils much too fast will comfortably adapt scale model wing loading naturally going higher Probably among best used air foils scale models 2400 series 2412 2415 very good scale sections last two numbers refer thickness other words 2412 has 12% thickness highest point lift about 35-40% leading edge percentage under 12% usually too thin retracting gear air craft will need least 14-15% hide wheels wells course may thicken thin leading edge gives model scale look its exceptions bi planes much thinner section may used such 9-10% Keep section thick enough support spars believe scale bipes have built-up wings have foam wings Usually trying simulate fabric-covered wing stab elevator should always symmetrical slab type airfoiled symmetrical wood foam full symmetrical stab much cleaner produces less drag slab type easier build align Both will work OK scale models good safe-size stab 18 20% total wing area total stab elevator course will go aerodynamics scratch-built scale bird later columns 78 Model Aviation Wilkens AMA-size Combat job has 460 sq area loam tips Weighs 18 oz ST 35
Edition: Model Aviation - 1976/01
Page Numbers: 33, 77, 78
Combat SOME SAY Combat luck guys win time claim 100% skill put top Both points well taken youre good enough can make own luck aided technical knowledge bit cunning sometimes large outlay cash Lets assume nationally competitive fliers like Howard Rush Dan Stubblefield flying 90% luck-free state maybe rest us 50% level novice still struggling eliminate 75% chance Obviously figures sake following argument that first move becoming better Combat flier put hopes super engines air planes developing physical emo tional intellectual capacities Youll have lot gain adding 2 mph decreasing turn radius foot Go local public library borrow good book becoming race car driver Model airplane fly ing requires same skills sometimes greater though penalty error losing match airplane opposed wreck ing car eventual level competitiveness will determined much time money effort will put activity nothing return guaranteed think flying Com bat way self expression have fun doing have determination become better follow steps 1 Admit yourself equipment better decently built Nemesis Charlie Johnson flies better 90% fliers country capable flying other planes share claim too just find fancy build lots because easy part 2 Put body shape Start regular exercise program work co-ordina tion Fat sluggish bodies little endurance arent going make youre serious about becoming best youll continued page 77 Englishman Richard Wilkins 400 sq FAI Combat visit US ha made outstand ing impression English design approach Below Comparison Wilkins ship typical US plane photos Lorna Samuel Scale IMPORTANT decision has just taken place rules judging CL Scale Basically changes flight points could affect model building future competition pro posed changes feel present rules too heavily weighted favor static points given resulted over-emphasis certain options favored type feature over another So make point read rules listed below note changes will Mike Stott able choose right model modify building take advantage new rules go effect first January 1976 447 Scale Operations Six optional demon strations shall selected following list Optional selections must announced judges before take-off operations must accomplished during models offi cial flight No points shall awarded unless operation complete Multi-engines 20 points will given use engine providing engines running take-off continue run least 10 laps Loss points individual engine stoppage will given according number laps affected No points will given Jetex-type engines b Retract extend landing gear 20 points cLower raise flaps0 20 points d Lower close bomb hay doors 0 20 points eDrop bombs0 20 points Bombs other droppable stores must made balsa hollow fiberglass plastic No sharp points hardwood metal construc tion allowedcontinued page 76 January 1976 33 Line-up AMA Scale jobs Nets foreground Cathy Burnstines Liberty Sport behind Ralph Burnatines F4B Chris Joiner pic What goes hero Pull-testing DIII I1arneys Hughes XF-11it weighs 13 1/4 lbsseems take three muscular anchor men landings Two-minute precision flights have made creditable 15 cumulative scores reached novice can reach achievements week-end flier gives him confidence tending first contest flier realizes has get together contest knowing able before has stimulate individuals giving go against local state national champion Secondly flexibility particular tasks ie duration 6-10 minutes precision 2-3 min utes landing zonesspeed/distance has allowed contest managers select tasks best suited own conditions same flexi bility has further kept contests becoming routine opinion current flavor tasksspeed/distance duration precision flying can maintained existing accepted flexibility would best interests sport past contest season attests way thinking Witness LSF Tournament its speed/distance task designed Donelson/ Hahn Michigan State Championships 24-minute cumulative3 round task no flight over 10 minutes penalized feature CD Gordon Pearson claimed widely accepted point modifications tasks introduced presented because serve new need purpose Although variations theme often have also refinements CDs contest planners have taken few liberties rule book same people have added new dimensions competition modifica tions have seldom caused unpleasant air above have encouraged discouraged newcomer climb ring LSFShortlines Membership October past 1600 west country join Czech oslovakia w soaring oking added challenge in LSF Send letter intent form League Silent Flight Dept M PO Box 39068 Chicago IL 60639 Include stamped self-addressed envelope address Rt 2 Box 490 Plainfield Ill 60544 3 Work concentration After fivemile run try flying AMA Stunt Pattern best Combat ship Develop ability block out pain exhaustion think about making correct decision Fly enough practice going both upright inverted overcome tendency become dizzy beginner intermediate goes route will find progress somewhat slower tedious just built bunch planes went out bash everybody end will acquire far greater level proficiency Professionals practice first compete Combat events low cost fun event can found class Rules vary through out country basically use 049 en gines 25- 40-foot lines California fly rule hut nobody knows what little devils require lot patience times suggested ulcer-prone author has 049s sale very sophisticated event found FA Combat flown international level US flown like 15-size AMA Combat will change World Cham pionships including Combat held scramble place US Team gets underway third class proclaimed decree Sunday flier special Slow Combat generally easiest place start beginner often left Junior Senior age contestants Slow Com bat will soon become new battle ground model designer because its place better plane advantage spectacular splatter Fast Combat high power high appeal event because last AMA events really no restrictions Once engine airplane hackers delight event has lost some its appeal because high horsepower ultra-trick airplanes became synonymous big-hole-in-ground falling pieces de cide design own plane sure give trick name can name after yourself win Nationals getting body mind airplanes shape can decide classes com pete also involved youll become local regional meets year throughout country well Nationals really flying might consider attending international meet like British National Championships Dutch International Spaarndam have great regional differences US noth ing like Europe attending international meeting youll rewarded experiences will give whole new perspective model flying 1974 Europeans got look American horsepower took K&B 40-powered Nemesis over some exhibition flights Yanks got first hand look I-l MOVINGLET US KNOW COMPLETETHISWhen WHERE YOU ARE GOINGI move please let us know advancesix weeks re CARD AND ATTACHquired change address Attach current MA mailing label I MAILING LABEL space cheek appropriate box below mail FROMA RECENTSubscription Dept Model Aviation 806 Fifteenth St. NW IISSUEWashington DC 20005I ICheck appropriate boxenclose paymentI 0 CHANGE OF ADDRESS0 NEW SUBSCRIPTION Non-AMA subscription rates $1200 12 months Canada United States posses sions elsewhere $1400 Membership AMA includes subscription see separate applica-I tion issueI NAMEI ADDRESSI CITY/STATE71 P___________________ LMODEL AVIATION 806 FIFTEENTH ST. NW. WASHINGTON DC 20005 January 1976 77 CL Combat/Johnson continued page 33 WANTED ideas happenings hints/kinks howto sketches photos news etc Send colum nist category concernedat address shown column photo idea printed Model Aviation will pay $5 contributor NEWNEWNEW NEWNEWNEW NEWNEWNEW Custom blended12 Volt Fuel Pump Oper Bill Hagerate 12v starting Sport RC Pylon Racingbattery Economy pump12 Volt Starting Battery 55 blends Castor Klotz oil$1095 Deluxe pump withamp Ideal use blends FAI 700/0leads switch fuel linenew 12v fuel pump nitro$1295any 12v starter $1320 Harrys Hobbies IncPhone 513 276-5898 5224 North Dixie DriveDealer inquiries invitedDayton Ohio 45414 CL Combat continued Englishman Richard Wilkens years Nationals Richard gave Ameri cans treatment made us think about might match up against other British European fliers doubt neither Rich ard nor myself changed minds fliers got chance see things done differently technical scene reported Ron Sheldon Tony Guest coming close making Fox Schnuerle truly competitive engine others throughout country working parallel courses reports over indicate things look promising Supertigre took Tom Uptons advice re designed G21-35BB new Combat Special K&B has introduced new 35 aimed sport market addition 4OBB front-end peripheral jet venturi about fastest out box engine going FAI Combat has another escal FAI Combat has another esca lation horsepower sophistication Die hard British diesel fliers have switched Rossi diesels now keeping up G20 GIS Glow boys switch Rossi glows new kind contest works Southern California Special Pro Combat Association will hold its first contest San Diego December 7th contestants will fly minimum four rounds will invitation Bellcrank artists poor sports full-time line tanglers will invited AMA makes provision such contests offering Class B sanction type contest has tried past worked successfully less 30 entries would like send pictures comments just complaints may reached 3716 Ingraham St San Diego Calif 92109 714 273-6530 RC Helicopters/Schoonard continued page 19 point pet engine will show its ugly face will have tweak needle valve order get enough power under sustained collective setting will heat up start drop off power curve have good powerful engine its power output will crease during increased collective settings trial error process will have em ployed get tail-rotor pitch mix set tings proper start set tail-rotor pitch per manufacturers instructions tail-rotor mix 40-60 percent relationship tail-rotor mix needs adjusted add collective proper tail-rotor pitch added proper time little time spent will very rewarding later turn machine loose will go straight up tail swinging around have achieved will end result up side power curve constant blade speed proper mix relationship have seen lot people heard about lot can control tail rotor revert gyros kinds devices neces sary fact gyro wont help much underpowered out-of-trim helicopter may become too popular making kind statement truth helicopters have demonstrated rapid take-offs rapid de scents rock steady hands-off hovering wind Lately have flying Schluter Heli Baby little marvel flies hands off kinds weatheryes tail will fly hands off am really excited about rugged helicopter couple weeks ago show ing off stalled hit ground really hard about 60 feet bounced end over end like football damage bent output shaft side frames blade hold ers straightened parts replaced main blades flew right off super helicopter learn fly Next months column going deal Goodies Gadgets Such things heli copter Insurance both flight ground other equally exciting subjects column needs pictures creations espe cially incorporates some unique features Please direct correspondence RC Helicopt ers care Walt Schoonard 2080 Sharon Road Winter Park Fla 32789 RC Scale/Atkinson continued page 19 airplane attracted reason another has some fascination An other reason wanting build particular airplane will adapt well RC scale model first consideration powerplant just large want 45 60 pow ered Most Scale AMA Stand-off competition should 60-powered bird course extra detailing retracts used will give much higher wing loading say pattern sport bird Next course ob tain much information possible subject good set three views must make building plans its Stand-off Scale modifications can made insure better flying model changing outline too much aerodynamics involved scratch build ing scale model would make sizeable book may get part later articles best ways draw up scale model use other successful models starting point such good kit scale plans magazines Most standard airplanes ordinarily about same simply continuation other course exceptions Most WW II air craft basically same configuration de pending roles played such fight ers bombers dive-bombers reconnaissance etc over lay Spitfire P-SI ME109 Japanese Tony Macchi 202 would surprised moments would compa rable also true radial-engine fighter Probably prime factor good scale model proper airfoil fullsize aircraft cannot easily use full-size airfoil P-SI used high-speed lami nar section sections have used Goodyear models stay away scale unless want bomb land Most symmetrical laminar airfoils much too fast will comfortably adapt scale model wing loading naturally going higher Probably among best used air foils scale models 2400 series 2412 2415 very good scale sections last two numbers refer thickness other words 2412 has 12% thickness highest point lift about 35-40% leading edge percentage under 12% usually too thin retracting gear air craft will need least 14-15% hide wheels wells course may thicken thin leading edge gives model scale look its exceptions bi planes much thinner section may used such 9-10% Keep section thick enough support spars believe scale bipes have built-up wings have foam wings Usually trying simulate fabric-covered wing stab elevator should always symmetrical slab type airfoiled symmetrical wood foam full symmetrical stab much cleaner produces less drag slab type easier build align Both will work OK scale models good safe-size stab 18 20% total wing area total stab elevator course will go aerodynamics scratch-built scale bird later columns 78 Model Aviation Wilkens AMA-size Combat job has 460 sq area loam tips Weighs 18 oz ST 35