B Scale-Sport O Ralph D Kuenz installment Iron Mike Midkiff concludes two-part presentation get scale models fly IN LAST MONTHS article talked about building trimabilitythose changes made structure model improve both durability flyabil ity article will discuss stepby-step procedure has worked flight trimming rubber scale mod el However before get let mention number points should considered before attempt trim model I Leave cheesecake off until model fully trimmed Landing gear covers pitot tubes antennas other fragile parts dont contribute flight trim apt undamaged ap plied after model trimmed 2 Dont attempt first trimming flights area has less 8 12 inches grass very light model can fall hard enough structural damage isnt cushion grass land 3 Dont trim model 5-mph wind light frag ile models dont fly fast enough pene tration wind Also first flight trimming attempts will very erratic will have interpret know what adjust model wind blowing wont know whether dive caused down trim sudden shift wind OK sermon out way lets get flight trim model divided two categories 1 power-off trim glide 2 power-on trim power burst cruise Establish power-off trim first Put together rubber motor slightly longer distance motor peg prop hook install mod el Hand wind number turns motor take out slack hold prop pin doesnt unwind will equally distribute motor side model Now add clay inside bottom cowl balance leading edge have large front former opening some sheet wood area isnt problem put ugly lump clay Make sure balance Dont cheat tail-heavy model difficult trim unstable gusts now have models center gravity established Glide Flight Trimming Hand glide over grass glide should gentle push aimed point 20 30 feet ahead Carefully observe glide Did stall dive dive after stall sure model stalled raise leading edge stab 1/32 inch Remem ber adjusting slot talked about previous article Glide again still stalls add another 1/32 inch un der leading edge until have per fectly straight soft glide Any diving correct lowering stab leading edge 1/32 inch time until straight glide achieved Now glide long enough somewhat stable observe glide pronounced tendency roll turn side other occurs very gradual amount check sighting rear model under surface wing compared other may washin tip trail ing edge down side model turns away Remove heating steam heat cars exhaust field simultaneously twisting surface opposite direction wing cools Check again gliding Dont adjust rudder point unless found very warped way off center line fuselage re-emphasize adjust stab incidence small amounts wing washout get good consistent straight glide Dont attempt power flights until glide right Powered Flight Trimming Powered rub ber-model flight consists three stages I power burst 2 cruise 3 glide models center gravity flight sur faces pretty well established handgliding sessions model now ready Continued page 86 46 Model Aviation Still another interesting peanut scale time rhillips Aeroneer built Janick plans Stan Fink Note hinged cockpit canopy Photograph Carol Cogswell Foster-Wickner Wicko peanut scale built Mooney plans Stan Fink Peanut really unearths obscure subjects Carol Cogswell pic Graceful structure ot Zn-in Aeronca I.omat Ku series scale fliers also excellent Built Michael Zano TOp KINNER ~SPORTSTER~ 39wmppon O49poooer up 3chonnets T/c great sport troifler ot t930s$1295 FAIRCHILD 22 IRS Wingspan 9 to25Power 3Chonnel RIC *107 $2990 see local hobby dealer acrylate adhesives such Jet Hot Stuff used construction joints must reasonably tight stuff sim ply wont work sort adhesive sticks like crazy has no filling power solution fill joint something else Ralph Prey writing Satellite recom mends filling joints baking soda Sprinkle little rub gap before applying adhesive Carl Gold berg markets Jet adhesive recom mends microballoons Probably light powdery stuff would dotalcum chalk dust whatever Bob Meuser 4200 Gregory St Oak land CA 94619 FF Scale/Sport/Kuenz continued page 46 power flight Before actually winding up launching model add some downthrust Add shims top surface front former produce down angle prop shaft mid- low-wing model should about 2 3 degrees biplane high-wing model should 4 6 degrees degrees down-thrust just starters Again make sure trimming flying area has plenty grass cushion Hand wind about 50 60 turns motor launch model what ever breeze may Launch same way did gliding model Observe first power-glide flight determine what thrust-line changes may needed stage alter thrustline angles get steady controlled climb model ndes up add downthrust shims top front former 1/32 time model rolls left add shims left side front former produce right-thrust Now hand wind about 75 turns launch same way model turns right little too much remove some right-thrust add some left-thrust Continue test fly model adding 50 winds motor launching again 50 launching until reach maximum winds motor Observe AMERICAN CLASSICS worlds finest models Send free brochure SzwmYn 04 PIE RAm CONTROL VP TO THREE IOIANRDL& FOR RADIOT o r jCOAST PRIOR TiE %OLDENERO Tb ELLA NC ROJRUR COO DO 000 POWER etOlRNRN Itt 703 2739593 NR WINGSPAN 020 POWER PAR PULSE ARD PSALL WRTI.RAIOO FLYLINE MODELS OAR RD FLOWN FREE PLIROT 2905V2020 DOOR AVEFAIRFAX VA22030 flight need still further mi nor thrust-line changes produce wide left-hand nose-up climbing circle climb must highest angle tack still under control No stall ing falling should occur nor gal loping either conditions wastes power prevents model reach ing maximum altitude steady controlled climb may ask left-hand power pat tern model Without going lot past experience models have flown consistently flown lefthand pattern outdoors First fully wound motor will roll model slightly left during power burstand launched slightly right wind model will maintain little longer heading pointed wind will gain little altitude Second torque will roll model left will also keep nose up stalling model roll acts form down-thrust occurs during power burst Conversely straight-ahead climb generally requires too much down-thrust marginal power right-hand climb pat tern seems work well high-wing short-nose models though torque keeps wings somewhat level resultant gyroscopic action wants spiral model after power burst over choice wide left-hand power pattern OK model flying pretty well original motor maximum winds Re move motor install fresh Go immediately near maximum winds Observe model climbs fresh power Make corrections thrust line achieve consistent wide left-hand climb Watch cruise altitude after power burst complete Does model want fly away straight line down wind does tighten up right- left-hand spiralled de cent either case make adjustments rudder maintain wide left-hand cruise glide becomes difficult since must trim rudder will change power burst pattern would model climbs well left gains good alti tude flies down wind turning Slightly off-set rudder trailing edge left add touch rightthrust compensate may thickness card stock What trim necessary get good wide left-hand cruise glide must compensated opposite thrust-line changes power-burst climb pattern will de stroyed Suppose model climbs out well left-hand pattern cruise glide gradually tighten up left spiral dive Add right trim rudder just enough maintain wide left-hand cruise glide will have add some left-thrust take out some right-thrust maintain original climb pattern can easily see time effort must go trimming model fly right during power burst cruise glide Half dozen random flights nowhere near enough trim model properly thing cant believe hap pens guy comes contest new model expects trim few flights luck out two-minute flight doesnt happen way First have ever seen single contest day wasnt windy gusty will never get trimmed properly hur ricane Secondly concentration must go systematic effort mak ing miniature aircraft fly good looks will never happen contest activity going As anything life want get thing good out have put effort Systematically build model right trim right nothing product review product review product review New Books Radio Control Guide Nor man Butcher 250 pages $995 complete primer RC modeling also contains torical Survey Instructors Flight List some basic aerobatic maneuvers complete glossary RC modeling terms Special chap ters Boats Cars Both books re cently printed England distributed US Polks Radio Control Soaring Dave Hughes 260 pages $895 Divided three sections Slope Soaring Thermal Soaring Soaring Aerodynamics Polks Model-Craft Hobbies 314 Fifth Ave New York NY 10001 product review product review product review 86 Model Aviation HIGH POWER ULTRA SONIC CLEANER As shojon less cog & radio $8830 Chassis factory assembled $76 PISTON SETTING TOOL CDX 049 engines HARDENED STEEL-ANODIZED No TRA503$325 i LABLE SOONMufflers rear exhaust MUFF-L-IT SERIES Six eight Ob reduction noise engines Proportional voiumne expansion chamber Triple reflective intermediate chamber Large exhaust nozzle iow back pressure Little no loss power Available B C engines No 301 0919 $749 No 3122940$839 No 303 45-80 $949 NEW 112A MUFFLER Fits COX 049 engines new muffler gives significant noise reduction very little power lose Back facing nozzle No 300A049$549 No 3008051$549 SCHNOERLE enqines pretty throat catching Wildcat prewar markings circling 100 feet air sun shining through its covering created Ralph Kuenz 14645 Stahelin Detroit MI 48223 CL Aerobatics/Paul continued page 37 find very difficult attempt dif ferentiate between four five numbers given maneuver present system instance good maneuver seems very difficult contrast between 30-31-3233 especially actually com paring successive sets instance side squares 10 20 fliers about 10 minutes interval between decision 10-40 spread difficult find starting point median Twentyfive median starting point except landing know lot ofjudges use starting point good ma neuver gets graded up successively bad goes down 25 However lot latitude between 25 40 pick number good very good maneuver Using 0-10 range natural action think aver age median half way mark five number comes lot naturally picking 25 10-40 range competitive diving sport Ive familiar 15 years range judging very good 10 95 90 good 85 80 75 70 satisfactory 65 60 55 50 deficiency 45 40 35 30 unsatis factory 25 20 15 1005 failed 0 range category gives judge opportunity contrast within group ie judge can vary 70 85 good dive Granted diving degree difficulty separate dive 12 30 DD multiplied judges awards diver receives higher total tough dive easier dive aspect peculiar diving although have K fac tor FAI precision aerobatics scoring Lets remember stunt judge has about 7 seconds decide award write down feel too difficult mind categorize present award range 10-40 compared other maneuvers other stunt fliers pick between 30 choices just dont think reasonable us expect mind think over such large range numbers especially unfamiliar se quence range 10-40 word error counting system No dont think can count number time dont think can truly count actual number er rors 2-5 seconds takes maneuver illustrate consider inside squares poor entrytoo high too low rounding ityou deduct point very rapid succession must check first corner check ver tical sides check second corner same time checking overall shape size check 45-degree height also see second square same place first Also shouldnt some errors weighted others short dont think judge can count fast ac curately short time think have look overall impression maneuver noting above men tioned factors general impression would appear maneuver would have very different total number errors possible would think inside squares might have 16-20 errors four-leaf clover could have up 30 pos sible errors Advocates error-counting system overlook fact certain dividuals may think can score way what looking scoring system everybody can readily adjust rather easily feel big gest disadvantages error counting maneuver should have different number errors therefore ma neuver should have different set points Besides Al Rabe quick point out year error counting September1977 87 cleaner has patented Power Pump circuit nearly doubles power over cleaners same size Required top performance 2 & 4 quart sizes No 175 21 Quart $165 No 176 46 Quart $185 8 oz Detergent$195 qt Detergent$342 Lb THE INVADER 1/12th scale metal car revolution car technology Front rear wheel suspension Uses standard parts Car designed performance Patents applied for
Edition: Model Aviation - 1977/09
Page Numbers: 46, 86, 87
B Scale-Sport O Ralph D Kuenz installment Iron Mike Midkiff concludes two-part presentation get scale models fly IN LAST MONTHS article talked about building trimabilitythose changes made structure model improve both durability flyabil ity article will discuss stepby-step procedure has worked flight trimming rubber scale mod el However before get let mention number points should considered before attempt trim model I Leave cheesecake off until model fully trimmed Landing gear covers pitot tubes antennas other fragile parts dont contribute flight trim apt undamaged ap plied after model trimmed 2 Dont attempt first trimming flights area has less 8 12 inches grass very light model can fall hard enough structural damage isnt cushion grass land 3 Dont trim model 5-mph wind light frag ile models dont fly fast enough pene tration wind Also first flight trimming attempts will very erratic will have interpret know what adjust model wind blowing wont know whether dive caused down trim sudden shift wind OK sermon out way lets get flight trim model divided two categories 1 power-off trim glide 2 power-on trim power burst cruise Establish power-off trim first Put together rubber motor slightly longer distance motor peg prop hook install mod el Hand wind number turns motor take out slack hold prop pin doesnt unwind will equally distribute motor side model Now add clay inside bottom cowl balance leading edge have large front former opening some sheet wood area isnt problem put ugly lump clay Make sure balance Dont cheat tail-heavy model difficult trim unstable gusts now have models center gravity established Glide Flight Trimming Hand glide over grass glide should gentle push aimed point 20 30 feet ahead Carefully observe glide Did stall dive dive after stall sure model stalled raise leading edge stab 1/32 inch Remem ber adjusting slot talked about previous article Glide again still stalls add another 1/32 inch un der leading edge until have per fectly straight soft glide Any diving correct lowering stab leading edge 1/32 inch time until straight glide achieved Now glide long enough somewhat stable observe glide pronounced tendency roll turn side other occurs very gradual amount check sighting rear model under surface wing compared other may washin tip trail ing edge down side model turns away Remove heating steam heat cars exhaust field simultaneously twisting surface opposite direction wing cools Check again gliding Dont adjust rudder point unless found very warped way off center line fuselage re-emphasize adjust stab incidence small amounts wing washout get good consistent straight glide Dont attempt power flights until glide right Powered Flight Trimming Powered rub ber-model flight consists three stages I power burst 2 cruise 3 glide models center gravity flight sur faces pretty well established handgliding sessions model now ready Continued page 86 46 Model Aviation Still another interesting peanut scale time rhillips Aeroneer built Janick plans Stan Fink Note hinged cockpit canopy Photograph Carol Cogswell Foster-Wickner Wicko peanut scale built Mooney plans Stan Fink Peanut really unearths obscure subjects Carol Cogswell pic Graceful structure ot Zn-in Aeronca I.omat Ku series scale fliers also excellent Built Michael Zano TOp KINNER ~SPORTSTER~ 39wmppon O49poooer up 3chonnets T/c great sport troifler ot t930s$1295 FAIRCHILD 22 IRS Wingspan 9 to25Power 3Chonnel RIC *107 $2990 see local hobby dealer acrylate adhesives such Jet Hot Stuff used construction joints must reasonably tight stuff sim ply wont work sort adhesive sticks like crazy has no filling power solution fill joint something else Ralph Prey writing Satellite recom mends filling joints baking soda Sprinkle little rub gap before applying adhesive Carl Gold berg markets Jet adhesive recom mends microballoons Probably light powdery stuff would dotalcum chalk dust whatever Bob Meuser 4200 Gregory St Oak land CA 94619 FF Scale/Sport/Kuenz continued page 46 power flight Before actually winding up launching model add some downthrust Add shims top surface front former produce down angle prop shaft mid- low-wing model should about 2 3 degrees biplane high-wing model should 4 6 degrees degrees down-thrust just starters Again make sure trimming flying area has plenty grass cushion Hand wind about 50 60 turns motor launch model what ever breeze may Launch same way did gliding model Observe first power-glide flight determine what thrust-line changes may needed stage alter thrustline angles get steady controlled climb model ndes up add downthrust shims top front former 1/32 time model rolls left add shims left side front former produce right-thrust Now hand wind about 75 turns launch same way model turns right little too much remove some right-thrust add some left-thrust Continue test fly model adding 50 winds motor launching again 50 launching until reach maximum winds motor Observe AMERICAN CLASSICS worlds finest models Send free brochure SzwmYn 04 PIE RAm CONTROL VP TO THREE IOIANRDL& FOR RADIOT o r jCOAST PRIOR TiE %OLDENERO Tb ELLA NC ROJRUR COO DO 000 POWER etOlRNRN Itt 703 2739593 NR WINGSPAN 020 POWER PAR PULSE ARD PSALL WRTI.RAIOO FLYLINE MODELS OAR RD FLOWN FREE PLIROT 2905V2020 DOOR AVEFAIRFAX VA22030 flight need still further mi nor thrust-line changes produce wide left-hand nose-up climbing circle climb must highest angle tack still under control No stall ing falling should occur nor gal loping either conditions wastes power prevents model reach ing maximum altitude steady controlled climb may ask left-hand power pat tern model Without going lot past experience models have flown consistently flown lefthand pattern outdoors First fully wound motor will roll model slightly left during power burstand launched slightly right wind model will maintain little longer heading pointed wind will gain little altitude Second torque will roll model left will also keep nose up stalling model roll acts form down-thrust occurs during power burst Conversely straight-ahead climb generally requires too much down-thrust marginal power right-hand climb pat tern seems work well high-wing short-nose models though torque keeps wings somewhat level resultant gyroscopic action wants spiral model after power burst over choice wide left-hand power pattern OK model flying pretty well original motor maximum winds Re move motor install fresh Go immediately near maximum winds Observe model climbs fresh power Make corrections thrust line achieve consistent wide left-hand climb Watch cruise altitude after power burst complete Does model want fly away straight line down wind does tighten up right- left-hand spiralled de cent either case make adjustments rudder maintain wide left-hand cruise glide becomes difficult since must trim rudder will change power burst pattern would model climbs well left gains good alti tude flies down wind turning Slightly off-set rudder trailing edge left add touch rightthrust compensate may thickness card stock What trim necessary get good wide left-hand cruise glide must compensated opposite thrust-line changes power-burst climb pattern will de stroyed Suppose model climbs out well left-hand pattern cruise glide gradually tighten up left spiral dive Add right trim rudder just enough maintain wide left-hand cruise glide will have add some left-thrust take out some right-thrust maintain original climb pattern can easily see time effort must go trimming model fly right during power burst cruise glide Half dozen random flights nowhere near enough trim model properly thing cant believe hap pens guy comes contest new model expects trim few flights luck out two-minute flight doesnt happen way First have ever seen single contest day wasnt windy gusty will never get trimmed properly hur ricane Secondly concentration must go systematic effort mak ing miniature aircraft fly good looks will never happen contest activity going As anything life want get thing good out have put effort Systematically build model right trim right nothing product review product review product review New Books Radio Control Guide Nor man Butcher 250 pages $995 complete primer RC modeling also contains torical Survey Instructors Flight List some basic aerobatic maneuvers complete glossary RC modeling terms Special chap ters Boats Cars Both books re cently printed England distributed US Polks Radio Control Soaring Dave Hughes 260 pages $895 Divided three sections Slope Soaring Thermal Soaring Soaring Aerodynamics Polks Model-Craft Hobbies 314 Fifth Ave New York NY 10001 product review product review product review 86 Model Aviation HIGH POWER ULTRA SONIC CLEANER As shojon less cog & radio $8830 Chassis factory assembled $76 PISTON SETTING TOOL CDX 049 engines HARDENED STEEL-ANODIZED No TRA503$325 i LABLE SOONMufflers rear exhaust MUFF-L-IT SERIES Six eight Ob reduction noise engines Proportional voiumne expansion chamber Triple reflective intermediate chamber Large exhaust nozzle iow back pressure Little no loss power Available B C engines No 301 0919 $749 No 3122940$839 No 303 45-80 $949 NEW 112A MUFFLER Fits COX 049 engines new muffler gives significant noise reduction very little power lose Back facing nozzle No 300A049$549 No 3008051$549 SCHNOERLE enqines pretty throat catching Wildcat prewar markings circling 100 feet air sun shining through its covering created Ralph Kuenz 14645 Stahelin Detroit MI 48223 CL Aerobatics/Paul continued page 37 find very difficult attempt dif ferentiate between four five numbers given maneuver present system instance good maneuver seems very difficult contrast between 30-31-3233 especially actually com paring successive sets instance side squares 10 20 fliers about 10 minutes interval between decision 10-40 spread difficult find starting point median Twentyfive median starting point except landing know lot ofjudges use starting point good ma neuver gets graded up successively bad goes down 25 However lot latitude between 25 40 pick number good very good maneuver Using 0-10 range natural action think aver age median half way mark five number comes lot naturally picking 25 10-40 range competitive diving sport Ive familiar 15 years range judging very good 10 95 90 good 85 80 75 70 satisfactory 65 60 55 50 deficiency 45 40 35 30 unsatis factory 25 20 15 1005 failed 0 range category gives judge opportunity contrast within group ie judge can vary 70 85 good dive Granted diving degree difficulty separate dive 12 30 DD multiplied judges awards diver receives higher total tough dive easier dive aspect peculiar diving although have K fac tor FAI precision aerobatics scoring Lets remember stunt judge has about 7 seconds decide award write down feel too difficult mind categorize present award range 10-40 compared other maneuvers other stunt fliers pick between 30 choices just dont think reasonable us expect mind think over such large range numbers especially unfamiliar se quence range 10-40 word error counting system No dont think can count number time dont think can truly count actual number er rors 2-5 seconds takes maneuver illustrate consider inside squares poor entrytoo high too low rounding ityou deduct point very rapid succession must check first corner check ver tical sides check second corner same time checking overall shape size check 45-degree height also see second square same place first Also shouldnt some errors weighted others short dont think judge can count fast ac curately short time think have look overall impression maneuver noting above men tioned factors general impression would appear maneuver would have very different total number errors possible would think inside squares might have 16-20 errors four-leaf clover could have up 30 pos sible errors Advocates error-counting system overlook fact certain dividuals may think can score way what looking scoring system everybody can readily adjust rather easily feel big gest disadvantages error counting maneuver should have different number errors therefore ma neuver should have different set points Besides Al Rabe quick point out year error counting September1977 87 cleaner has patented Power Pump circuit nearly doubles power over cleaners same size Required top performance 2 & 4 quart sizes No 175 21 Quart $165 No 176 46 Quart $185 8 oz Detergent$195 qt Detergent$342 Lb THE INVADER 1/12th scale metal car revolution car technology Front rear wheel suspension Uses standard parts Car designed performance Patents applied for
Edition: Model Aviation - 1977/09
Page Numbers: 46, 86, 87
B Scale-Sport O Ralph D Kuenz installment Iron Mike Midkiff concludes two-part presentation get scale models fly IN LAST MONTHS article talked about building trimabilitythose changes made structure model improve both durability flyabil ity article will discuss stepby-step procedure has worked flight trimming rubber scale mod el However before get let mention number points should considered before attempt trim model I Leave cheesecake off until model fully trimmed Landing gear covers pitot tubes antennas other fragile parts dont contribute flight trim apt undamaged ap plied after model trimmed 2 Dont attempt first trimming flights area has less 8 12 inches grass very light model can fall hard enough structural damage isnt cushion grass land 3 Dont trim model 5-mph wind light frag ile models dont fly fast enough pene tration wind Also first flight trimming attempts will very erratic will have interpret know what adjust model wind blowing wont know whether dive caused down trim sudden shift wind OK sermon out way lets get flight trim model divided two categories 1 power-off trim glide 2 power-on trim power burst cruise Establish power-off trim first Put together rubber motor slightly longer distance motor peg prop hook install mod el Hand wind number turns motor take out slack hold prop pin doesnt unwind will equally distribute motor side model Now add clay inside bottom cowl balance leading edge have large front former opening some sheet wood area isnt problem put ugly lump clay Make sure balance Dont cheat tail-heavy model difficult trim unstable gusts now have models center gravity established Glide Flight Trimming Hand glide over grass glide should gentle push aimed point 20 30 feet ahead Carefully observe glide Did stall dive dive after stall sure model stalled raise leading edge stab 1/32 inch Remem ber adjusting slot talked about previous article Glide again still stalls add another 1/32 inch un der leading edge until have per fectly straight soft glide Any diving correct lowering stab leading edge 1/32 inch time until straight glide achieved Now glide long enough somewhat stable observe glide pronounced tendency roll turn side other occurs very gradual amount check sighting rear model under surface wing compared other may washin tip trail ing edge down side model turns away Remove heating steam heat cars exhaust field simultaneously twisting surface opposite direction wing cools Check again gliding Dont adjust rudder point unless found very warped way off center line fuselage re-emphasize adjust stab incidence small amounts wing washout get good consistent straight glide Dont attempt power flights until glide right Powered Flight Trimming Powered rub ber-model flight consists three stages I power burst 2 cruise 3 glide models center gravity flight sur faces pretty well established handgliding sessions model now ready Continued page 86 46 Model Aviation Still another interesting peanut scale time rhillips Aeroneer built Janick plans Stan Fink Note hinged cockpit canopy Photograph Carol Cogswell Foster-Wickner Wicko peanut scale built Mooney plans Stan Fink Peanut really unearths obscure subjects Carol Cogswell pic Graceful structure ot Zn-in Aeronca I.omat Ku series scale fliers also excellent Built Michael Zano TOp KINNER ~SPORTSTER~ 39wmppon O49poooer up 3chonnets T/c great sport troifler ot t930s$1295 FAIRCHILD 22 IRS Wingspan 9 to25Power 3Chonnel RIC *107 $2990 see local hobby dealer acrylate adhesives such Jet Hot Stuff used construction joints must reasonably tight stuff sim ply wont work sort adhesive sticks like crazy has no filling power solution fill joint something else Ralph Prey writing Satellite recom mends filling joints baking soda Sprinkle little rub gap before applying adhesive Carl Gold berg markets Jet adhesive recom mends microballoons Probably light powdery stuff would dotalcum chalk dust whatever Bob Meuser 4200 Gregory St Oak land CA 94619 FF Scale/Sport/Kuenz continued page 46 power flight Before actually winding up launching model add some downthrust Add shims top surface front former produce down angle prop shaft mid- low-wing model should about 2 3 degrees biplane high-wing model should 4 6 degrees degrees down-thrust just starters Again make sure trimming flying area has plenty grass cushion Hand wind about 50 60 turns motor launch model what ever breeze may Launch same way did gliding model Observe first power-glide flight determine what thrust-line changes may needed stage alter thrustline angles get steady controlled climb model ndes up add downthrust shims top front former 1/32 time model rolls left add shims left side front former produce right-thrust Now hand wind about 75 turns launch same way model turns right little too much remove some right-thrust add some left-thrust Continue test fly model adding 50 winds motor launching again 50 launching until reach maximum winds motor Observe AMERICAN CLASSICS worlds finest models Send free brochure SzwmYn 04 PIE RAm CONTROL VP TO THREE IOIANRDL& FOR RADIOT o r jCOAST PRIOR TiE %OLDENERO Tb ELLA NC ROJRUR COO DO 000 POWER etOlRNRN Itt 703 2739593 NR WINGSPAN 020 POWER PAR PULSE ARD PSALL WRTI.RAIOO FLYLINE MODELS OAR RD FLOWN FREE PLIROT 2905V2020 DOOR AVEFAIRFAX VA22030 flight need still further mi nor thrust-line changes produce wide left-hand nose-up climbing circle climb must highest angle tack still under control No stall ing falling should occur nor gal loping either conditions wastes power prevents model reach ing maximum altitude steady controlled climb may ask left-hand power pat tern model Without going lot past experience models have flown consistently flown lefthand pattern outdoors First fully wound motor will roll model slightly left during power burstand launched slightly right wind model will maintain little longer heading pointed wind will gain little altitude Second torque will roll model left will also keep nose up stalling model roll acts form down-thrust occurs during power burst Conversely straight-ahead climb generally requires too much down-thrust marginal power right-hand climb pat tern seems work well high-wing short-nose models though torque keeps wings somewhat level resultant gyroscopic action wants spiral model after power burst over choice wide left-hand power pattern OK model flying pretty well original motor maximum winds Re move motor install fresh Go immediately near maximum winds Observe model climbs fresh power Make corrections thrust line achieve consistent wide left-hand climb Watch cruise altitude after power burst complete Does model want fly away straight line down wind does tighten up right- left-hand spiralled de cent either case make adjustments rudder maintain wide left-hand cruise glide becomes difficult since must trim rudder will change power burst pattern would model climbs well left gains good alti tude flies down wind turning Slightly off-set rudder trailing edge left add touch rightthrust compensate may thickness card stock What trim necessary get good wide left-hand cruise glide must compensated opposite thrust-line changes power-burst climb pattern will de stroyed Suppose model climbs out well left-hand pattern cruise glide gradually tighten up left spiral dive Add right trim rudder just enough maintain wide left-hand cruise glide will have add some left-thrust take out some right-thrust maintain original climb pattern can easily see time effort must go trimming model fly right during power burst cruise glide Half dozen random flights nowhere near enough trim model properly thing cant believe hap pens guy comes contest new model expects trim few flights luck out two-minute flight doesnt happen way First have ever seen single contest day wasnt windy gusty will never get trimmed properly hur ricane Secondly concentration must go systematic effort mak ing miniature aircraft fly good looks will never happen contest activity going As anything life want get thing good out have put effort Systematically build model right trim right nothing product review product review product review New Books Radio Control Guide Nor man Butcher 250 pages $995 complete primer RC modeling also contains torical Survey Instructors Flight List some basic aerobatic maneuvers complete glossary RC modeling terms Special chap ters Boats Cars Both books re cently printed England distributed US Polks Radio Control Soaring Dave Hughes 260 pages $895 Divided three sections Slope Soaring Thermal Soaring Soaring Aerodynamics Polks Model-Craft Hobbies 314 Fifth Ave New York NY 10001 product review product review product review 86 Model Aviation HIGH POWER ULTRA SONIC CLEANER As shojon less cog & radio $8830 Chassis factory assembled $76 PISTON SETTING TOOL CDX 049 engines HARDENED STEEL-ANODIZED No TRA503$325 i LABLE SOONMufflers rear exhaust MUFF-L-IT SERIES Six eight Ob reduction noise engines Proportional voiumne expansion chamber Triple reflective intermediate chamber Large exhaust nozzle iow back pressure Little no loss power Available B C engines No 301 0919 $749 No 3122940$839 No 303 45-80 $949 NEW 112A MUFFLER Fits COX 049 engines new muffler gives significant noise reduction very little power lose Back facing nozzle No 300A049$549 No 3008051$549 SCHNOERLE enqines pretty throat catching Wildcat prewar markings circling 100 feet air sun shining through its covering created Ralph Kuenz 14645 Stahelin Detroit MI 48223 CL Aerobatics/Paul continued page 37 find very difficult attempt dif ferentiate between four five numbers given maneuver present system instance good maneuver seems very difficult contrast between 30-31-3233 especially actually com paring successive sets instance side squares 10 20 fliers about 10 minutes interval between decision 10-40 spread difficult find starting point median Twentyfive median starting point except landing know lot ofjudges use starting point good ma neuver gets graded up successively bad goes down 25 However lot latitude between 25 40 pick number good very good maneuver Using 0-10 range natural action think aver age median half way mark five number comes lot naturally picking 25 10-40 range competitive diving sport Ive familiar 15 years range judging very good 10 95 90 good 85 80 75 70 satisfactory 65 60 55 50 deficiency 45 40 35 30 unsatis factory 25 20 15 1005 failed 0 range category gives judge opportunity contrast within group ie judge can vary 70 85 good dive Granted diving degree difficulty separate dive 12 30 DD multiplied judges awards diver receives higher total tough dive easier dive aspect peculiar diving although have K fac tor FAI precision aerobatics scoring Lets remember stunt judge has about 7 seconds decide award write down feel too difficult mind categorize present award range 10-40 compared other maneuvers other stunt fliers pick between 30 choices just dont think reasonable us expect mind think over such large range numbers especially unfamiliar se quence range 10-40 word error counting system No dont think can count number time dont think can truly count actual number er rors 2-5 seconds takes maneuver illustrate consider inside squares poor entrytoo high too low rounding ityou deduct point very rapid succession must check first corner check ver tical sides check second corner same time checking overall shape size check 45-degree height also see second square same place first Also shouldnt some errors weighted others short dont think judge can count fast ac curately short time think have look overall impression maneuver noting above men tioned factors general impression would appear maneuver would have very different total number errors possible would think inside squares might have 16-20 errors four-leaf clover could have up 30 pos sible errors Advocates error-counting system overlook fact certain dividuals may think can score way what looking scoring system everybody can readily adjust rather easily feel big gest disadvantages error counting maneuver should have different number errors therefore ma neuver should have different set points Besides Al Rabe quick point out year error counting September1977 87 cleaner has patented Power Pump circuit nearly doubles power over cleaners same size Required top performance 2 & 4 quart sizes No 175 21 Quart $165 No 176 46 Quart $185 8 oz Detergent$195 qt Detergent$342 Lb THE INVADER 1/12th scale metal car revolution car technology Front rear wheel suspension Uses standard parts Car designed performance Patents applied for