NO OCR TEXT NO OCR TEXT forcettoicly shey should hoow products ore worth because little historic researching fot Sowetiwes other plors ore prettier hut bosic ourheoticity detoiliog oed prototype inforwetioc glue rho t coonts whse its eufhertis wodeliog youre ofter Theres o world costly diPerenee wheo hcy CDs ecee otseoerol tiwen rho price hot os serious wodelerseod eciosion persoocol soy Nore hut CDs gioe yoc oppeoroncethe feel oldtiwers sowehew hoild thew FOR YOUR HOBBY AT R R M N M SENO St OR CATALOG SE 2 YRS SUBS St ADO tOe 1100 PLANS _________________________________ AVAILABLE 1931 Gee Bee Super Sportster 1 eeSle General Arrange ment Drawing Catalog 25c W T Bill Given MODERNISTIC MODELS PO BOX 6974 ALBUG NM 87197 adjusting engines barely ac complish required ROG maintain shallow cruising climb Engine runs over ten minutes common often attain good altitude thermal exten sion flight As can imagine large site minimal drift required event qualify event model de sign must 1938 earlier Wing span must six feet greater orig nal ignition engines allowed clas sic old birds cruising slowly overhead make excellent targets camera buff takeoff runs long slow few feet altitude gained per circle can manage several good shots Clarence Haught Rt 5 Box 16 Coeur dAlene ID 83614 FF Indoor/Tenny continued page 55 hooked twiceonce winder rubber can hooked prop shaft once unhook torquemeter easy enough hook meter prop re-check torque much lost moving motor torquemeter models rear hook Use 0 Ring purist stand point 0 ring rubber synthetic circle rubbera doughnut shape used gasket between metal fittings pressure vacuum systems indoor models 0 ring something slipped meter allows mo tor unhooked removing turns past 0 rings have made small diameter music wire bent circle hooked itself re cently either plastic rings real 0 ringsvery tiny ones-have used Photo shows plastic 0 ring motor Photo 2 shows rubber 0 ring same size motor Note rubber 0 ring fits very closely motor can advantage Because 0 ring fits snugly helps hold motor rear hook motor unwinds completely plastic 0 rings made slicing off end piece Nyrod particular brand pushrod radio con trol models After rings cut sharp edges removed boiling water 0 rings very light flier should experimentally test strength 0 rings winding motors destruction model rubber 0 rings available Ron Plotzke Aorolite 36659 Ledgestone Mt Clem ens Ml 48043 Ray Harlan 15 Happy Hollow Rd. Wayland MA 01778 As mentioned before rubber 0 rings fit rather snugly rubber motor enough difficult get 0 ring slide rubber answer shown Photos 3 4 small diameter wire insect mounting pin shown bent double pushed through 0 ring 0 ring pushed over rubber end rubber pulled through Whether use extra 0 ring question since no doubt mind about using least After experience using 0 rings difficult accept inconvenience uncertainty involved having least 0 ring factors weighing decision model size ceiling height weight 0 ring some cases factors like fail ing eyesight poor lighting contest site enter picture simply easier see hook up 0 ring particularly plastic ones weight 0 ring typically less 0005 oz certainly minor factor FAI Stick model must weigh 0354 oz espe cially since precise control models trajectory possible other factors unchanged altitude model attains directly proportional launch torque too small model such ROG 0 ring higher proportion models fly ing weight loss few turns tiny rubber has almost negligible effect launch torque heavier indoor model power proportionally needs given model size leads problems bunching rubber knots rubbing fuselage usually effects detrimental long flights Pennyplane models com pound problem having high required weight requiring very short fuselages Although rubber model ap proaches its maximum duration rub ber weight approaches 1 s air plane weight short Pennyplane fuse lage poses such rubber handling problems few fliers manage use 80% much rubber weight airplane weight Thus rubber handling problems can solved Pennyplane times bound go up 0 rings tend help pre vent rubber bunching prep no has reported 0 ring really strong enough rubber weight already short improvement helps should o rings Pennyplane Bud Tennv Box 545 Richardson TX 75080 FF Duration/Meuser continued page 53 used several models An added feature fuse easy light check compared uusual tail mount use aluminum tubing curved parts line path plastic tubing could used Metal tubing will easily kink bent sharply use end finger thumb form bend slowly carefully radius inch less can achieved method 3/32 aluminum tubing Metal tubes should flared out bit end line will cut Twenty-pound test Da cron line works well line Other sizes types can used front tube must placed far enough rearward stab will pop up desired angle Check before mounting front hook will catch tube act limiter bend hooks out pins plenty strong enough gas model piece 1/32 ply glued around stab hole adds needed strength point rear wire will slide through hole stab placed parallel string sketch shows typical set-up large model tail-mounted fuse beyond convenient reach flier makes launching two man job small light models CG shift due burn ing fuse can change glide pattern sig nificantly aside fire hazard tail-mounted fuse makes little sense Clarences idea mounting fuse top seems like winner However internal dethermalizer strings plastic tubing running clear inlet outlet often preferred over alu minum tubing original string gets pulled out can easily replaced Twenty-pound woven Dacron Nylon line can pushed through end bends gentle monofilament line can pushed through series se vere bends extremely lightweight models weight plastic tubing might factor external DT string seems like best bet Plastic tubing selected purpose well proved can obtained NFFS Supplies 9525 Achates Cl Sacra mento CA 95826 send SASE complete price list Top following incident will undoubtedly nominated Best Grandstand Act 1978 took place recent Max-Men FAI An96 Model Aviation nual Taft Gary Medley towing A-2 towline glider attempt 14 max line slipped out hand model took off downwind good air line still attached Thinking better chasing foot Gary ran back got motorcycle chase model got low enough abandoned cycle grabbed towline towed model back field foot launched maxed Sandwiched between stormy weekends all-FAI annual meet blessed two days excellent flying weather Most Southern California regulars there good represen tation Northern Cal too Competi tors came Michigan Colorado Oklahoma too Peter Allnutt wife Canada Peters parents England Five 14 entrants A-2 Glider maxed out Bob Isaacson won 14 maxes two max-outs both Wakefield Power top honors finally going Bob Piserchio Roger Simpson Among five top fliers three events five previous US Team mem bers plus ex-World Champion Quite meet Official Manhattan Formula Rules long last perhaps rules event nailed down Until now pub lished version differed slightly other published version rules pub lished based iden tical versions published MIAMA club also con siderably different Ed Whittens orig inal rules decade ago rules under event will flown active New York group will un doubtedly local variations 1 Airframe weight less rubber 4 grams minimum 2 Overall length measured front prop bearing 20 maximum 3 Fuselage Must support enclose single rubber motor No motor sticks b Must include excede box 2 X 4 x 2 c Must havea windshield 2 sq minimum area plust window side 1 sq minimum area covered cellophane similar transparent material 4 Prop wood direct drive fixed pitch 5 Wing Monoplane maximum pro jected span 20 maximum chord 4 Wood bracing allowed 6 Stab Monoplane stab maximum projected span 8 maximum chord 3 Wood bracing allowed 7 Landing gear Rigid fixed least two wheels minimum diameter Must able support model 8 Covering Except windshield windows paper including condenser paper allowed No film Microlite 9 Flying flights least two-point ROG Best single flight counts Un limited number official flights MARIAH 300 Latest well-worn workbench Vic Cunnyngham Jr 300-square-incher intended competi tion Classes Similar Vics Sirocco published Flying Models three years ago Vic says Mariah 300 much better features three rudders following old Fast Richard concept good two better Three should just about right Vics models have parts require greater building time typical designs geodetic ribs take little time get right wing built way unlikely warp under severe conditions wing Vics recent models has over 300 parts Compare typical Nordic A-2 glider has about three times Regarding A-2 wings Bob Hatschek claims hates build models recently remarked wing looks ready cover realize still have 200 parts go Vic regards complexity thera peutic exercise end working day Built during winter Mariah has yet experience rigors competi tion history repeats well probably still hearing about 1988 Bob Meuser 4200 Gregory St Oak land CA 94619 gine turn 19000 rpm 3000 over flight rpm c third prop stand ard exactly matches test prop Paul BugI uses tests three props am able reproduce flight loads bench will able pre dict exactly engine will perform model within 1 lap 1 rpm verify performance figures another experimenter BugI FAI Team Race performance testing refined form testing currently being done rapid advances helicopter ducted fan models benefiting similar experiments development appropriate props performance testing will enable modeler predict performance Racing eventslaps speed CL Aerobatics engine response duration run Throttled enginesengine response throttle characteristics third use props flying may seem odd think flying props last Really three uses props synergistic Ive put flight props last impress upon importance break-in power performance testing procedures Flight props fall several categories applications will discussed separately Moderate Performance Props used sport flying competition flying does place exacting demands design match engine power Scale precision aerobatics sport flying examples basic rule selection props use props recom mended engine manufacturer b select available props best suits requirements c stick off-the-shelf props High Performance Special Applica tion Props used events involve high stress loads and/or special design requirements achieve optimum performance Speed racing events com bat high performance FF events place special demands props demands typically operate July1978 97 Engine Technique/Jehlik continued page 47
Edition: Model Aviation - 1978/07
Page Numbers: 52, 53, 96, 97
NO OCR TEXT NO OCR TEXT forcettoicly shey should hoow products ore worth because little historic researching fot Sowetiwes other plors ore prettier hut bosic ourheoticity detoiliog oed prototype inforwetioc glue rho t coonts whse its eufhertis wodeliog youre ofter Theres o world costly diPerenee wheo hcy CDs ecee otseoerol tiwen rho price hot os serious wodelerseod eciosion persoocol soy Nore hut CDs gioe yoc oppeoroncethe feel oldtiwers sowehew hoild thew FOR YOUR HOBBY AT R R M N M SENO St OR CATALOG SE 2 YRS SUBS St ADO tOe 1100 PLANS _________________________________ AVAILABLE 1931 Gee Bee Super Sportster 1 eeSle General Arrange ment Drawing Catalog 25c W T Bill Given MODERNISTIC MODELS PO BOX 6974 ALBUG NM 87197 adjusting engines barely ac complish required ROG maintain shallow cruising climb Engine runs over ten minutes common often attain good altitude thermal exten sion flight As can imagine large site minimal drift required event qualify event model de sign must 1938 earlier Wing span must six feet greater orig nal ignition engines allowed clas sic old birds cruising slowly overhead make excellent targets camera buff takeoff runs long slow few feet altitude gained per circle can manage several good shots Clarence Haught Rt 5 Box 16 Coeur dAlene ID 83614 FF Indoor/Tenny continued page 55 hooked twiceonce winder rubber can hooked prop shaft once unhook torquemeter easy enough hook meter prop re-check torque much lost moving motor torquemeter models rear hook Use 0 Ring purist stand point 0 ring rubber synthetic circle rubbera doughnut shape used gasket between metal fittings pressure vacuum systems indoor models 0 ring something slipped meter allows mo tor unhooked removing turns past 0 rings have made small diameter music wire bent circle hooked itself re cently either plastic rings real 0 ringsvery tiny ones-have used Photo shows plastic 0 ring motor Photo 2 shows rubber 0 ring same size motor Note rubber 0 ring fits very closely motor can advantage Because 0 ring fits snugly helps hold motor rear hook motor unwinds completely plastic 0 rings made slicing off end piece Nyrod particular brand pushrod radio con trol models After rings cut sharp edges removed boiling water 0 rings very light flier should experimentally test strength 0 rings winding motors destruction model rubber 0 rings available Ron Plotzke Aorolite 36659 Ledgestone Mt Clem ens Ml 48043 Ray Harlan 15 Happy Hollow Rd. Wayland MA 01778 As mentioned before rubber 0 rings fit rather snugly rubber motor enough difficult get 0 ring slide rubber answer shown Photos 3 4 small diameter wire insect mounting pin shown bent double pushed through 0 ring 0 ring pushed over rubber end rubber pulled through Whether use extra 0 ring question since no doubt mind about using least After experience using 0 rings difficult accept inconvenience uncertainty involved having least 0 ring factors weighing decision model size ceiling height weight 0 ring some cases factors like fail ing eyesight poor lighting contest site enter picture simply easier see hook up 0 ring particularly plastic ones weight 0 ring typically less 0005 oz certainly minor factor FAI Stick model must weigh 0354 oz espe cially since precise control models trajectory possible other factors unchanged altitude model attains directly proportional launch torque too small model such ROG 0 ring higher proportion models fly ing weight loss few turns tiny rubber has almost negligible effect launch torque heavier indoor model power proportionally needs given model size leads problems bunching rubber knots rubbing fuselage usually effects detrimental long flights Pennyplane models com pound problem having high required weight requiring very short fuselages Although rubber model ap proaches its maximum duration rub ber weight approaches 1 s air plane weight short Pennyplane fuse lage poses such rubber handling problems few fliers manage use 80% much rubber weight airplane weight Thus rubber handling problems can solved Pennyplane times bound go up 0 rings tend help pre vent rubber bunching prep no has reported 0 ring really strong enough rubber weight already short improvement helps should o rings Pennyplane Bud Tennv Box 545 Richardson TX 75080 FF Duration/Meuser continued page 53 used several models An added feature fuse easy light check compared uusual tail mount use aluminum tubing curved parts line path plastic tubing could used Metal tubing will easily kink bent sharply use end finger thumb form bend slowly carefully radius inch less can achieved method 3/32 aluminum tubing Metal tubes should flared out bit end line will cut Twenty-pound test Da cron line works well line Other sizes types can used front tube must placed far enough rearward stab will pop up desired angle Check before mounting front hook will catch tube act limiter bend hooks out pins plenty strong enough gas model piece 1/32 ply glued around stab hole adds needed strength point rear wire will slide through hole stab placed parallel string sketch shows typical set-up large model tail-mounted fuse beyond convenient reach flier makes launching two man job small light models CG shift due burn ing fuse can change glide pattern sig nificantly aside fire hazard tail-mounted fuse makes little sense Clarences idea mounting fuse top seems like winner However internal dethermalizer strings plastic tubing running clear inlet outlet often preferred over alu minum tubing original string gets pulled out can easily replaced Twenty-pound woven Dacron Nylon line can pushed through end bends gentle monofilament line can pushed through series se vere bends extremely lightweight models weight plastic tubing might factor external DT string seems like best bet Plastic tubing selected purpose well proved can obtained NFFS Supplies 9525 Achates Cl Sacra mento CA 95826 send SASE complete price list Top following incident will undoubtedly nominated Best Grandstand Act 1978 took place recent Max-Men FAI An96 Model Aviation nual Taft Gary Medley towing A-2 towline glider attempt 14 max line slipped out hand model took off downwind good air line still attached Thinking better chasing foot Gary ran back got motorcycle chase model got low enough abandoned cycle grabbed towline towed model back field foot launched maxed Sandwiched between stormy weekends all-FAI annual meet blessed two days excellent flying weather Most Southern California regulars there good represen tation Northern Cal too Competi tors came Michigan Colorado Oklahoma too Peter Allnutt wife Canada Peters parents England Five 14 entrants A-2 Glider maxed out Bob Isaacson won 14 maxes two max-outs both Wakefield Power top honors finally going Bob Piserchio Roger Simpson Among five top fliers three events five previous US Team mem bers plus ex-World Champion Quite meet Official Manhattan Formula Rules long last perhaps rules event nailed down Until now pub lished version differed slightly other published version rules pub lished based iden tical versions published MIAMA club also con siderably different Ed Whittens orig inal rules decade ago rules under event will flown active New York group will un doubtedly local variations 1 Airframe weight less rubber 4 grams minimum 2 Overall length measured front prop bearing 20 maximum 3 Fuselage Must support enclose single rubber motor No motor sticks b Must include excede box 2 X 4 x 2 c Must havea windshield 2 sq minimum area plust window side 1 sq minimum area covered cellophane similar transparent material 4 Prop wood direct drive fixed pitch 5 Wing Monoplane maximum pro jected span 20 maximum chord 4 Wood bracing allowed 6 Stab Monoplane stab maximum projected span 8 maximum chord 3 Wood bracing allowed 7 Landing gear Rigid fixed least two wheels minimum diameter Must able support model 8 Covering Except windshield windows paper including condenser paper allowed No film Microlite 9 Flying flights least two-point ROG Best single flight counts Un limited number official flights MARIAH 300 Latest well-worn workbench Vic Cunnyngham Jr 300-square-incher intended competi tion Classes Similar Vics Sirocco published Flying Models three years ago Vic says Mariah 300 much better features three rudders following old Fast Richard concept good two better Three should just about right Vics models have parts require greater building time typical designs geodetic ribs take little time get right wing built way unlikely warp under severe conditions wing Vics recent models has over 300 parts Compare typical Nordic A-2 glider has about three times Regarding A-2 wings Bob Hatschek claims hates build models recently remarked wing looks ready cover realize still have 200 parts go Vic regards complexity thera peutic exercise end working day Built during winter Mariah has yet experience rigors competi tion history repeats well probably still hearing about 1988 Bob Meuser 4200 Gregory St Oak land CA 94619 gine turn 19000 rpm 3000 over flight rpm c third prop stand ard exactly matches test prop Paul BugI uses tests three props am able reproduce flight loads bench will able pre dict exactly engine will perform model within 1 lap 1 rpm verify performance figures another experimenter BugI FAI Team Race performance testing refined form testing currently being done rapid advances helicopter ducted fan models benefiting similar experiments development appropriate props performance testing will enable modeler predict performance Racing eventslaps speed CL Aerobatics engine response duration run Throttled enginesengine response throttle characteristics third use props flying may seem odd think flying props last Really three uses props synergistic Ive put flight props last impress upon importance break-in power performance testing procedures Flight props fall several categories applications will discussed separately Moderate Performance Props used sport flying competition flying does place exacting demands design match engine power Scale precision aerobatics sport flying examples basic rule selection props use props recom mended engine manufacturer b select available props best suits requirements c stick off-the-shelf props High Performance Special Applica tion Props used events involve high stress loads and/or special design requirements achieve optimum performance Speed racing events com bat high performance FF events place special demands props demands typically operate July1978 97 Engine Technique/Jehlik continued page 47
Edition: Model Aviation - 1978/07
Page Numbers: 52, 53, 96, 97
NO OCR TEXT NO OCR TEXT forcettoicly shey should hoow products ore worth because little historic researching fot Sowetiwes other plors ore prettier hut bosic ourheoticity detoiliog oed prototype inforwetioc glue rho t coonts whse its eufhertis wodeliog youre ofter Theres o world costly diPerenee wheo hcy CDs ecee otseoerol tiwen rho price hot os serious wodelerseod eciosion persoocol soy Nore hut CDs gioe yoc oppeoroncethe feel oldtiwers sowehew hoild thew FOR YOUR HOBBY AT R R M N M SENO St OR CATALOG SE 2 YRS SUBS St ADO tOe 1100 PLANS _________________________________ AVAILABLE 1931 Gee Bee Super Sportster 1 eeSle General Arrange ment Drawing Catalog 25c W T Bill Given MODERNISTIC MODELS PO BOX 6974 ALBUG NM 87197 adjusting engines barely ac complish required ROG maintain shallow cruising climb Engine runs over ten minutes common often attain good altitude thermal exten sion flight As can imagine large site minimal drift required event qualify event model de sign must 1938 earlier Wing span must six feet greater orig nal ignition engines allowed clas sic old birds cruising slowly overhead make excellent targets camera buff takeoff runs long slow few feet altitude gained per circle can manage several good shots Clarence Haught Rt 5 Box 16 Coeur dAlene ID 83614 FF Indoor/Tenny continued page 55 hooked twiceonce winder rubber can hooked prop shaft once unhook torquemeter easy enough hook meter prop re-check torque much lost moving motor torquemeter models rear hook Use 0 Ring purist stand point 0 ring rubber synthetic circle rubbera doughnut shape used gasket between metal fittings pressure vacuum systems indoor models 0 ring something slipped meter allows mo tor unhooked removing turns past 0 rings have made small diameter music wire bent circle hooked itself re cently either plastic rings real 0 ringsvery tiny ones-have used Photo shows plastic 0 ring motor Photo 2 shows rubber 0 ring same size motor Note rubber 0 ring fits very closely motor can advantage Because 0 ring fits snugly helps hold motor rear hook motor unwinds completely plastic 0 rings made slicing off end piece Nyrod particular brand pushrod radio con trol models After rings cut sharp edges removed boiling water 0 rings very light flier should experimentally test strength 0 rings winding motors destruction model rubber 0 rings available Ron Plotzke Aorolite 36659 Ledgestone Mt Clem ens Ml 48043 Ray Harlan 15 Happy Hollow Rd. Wayland MA 01778 As mentioned before rubber 0 rings fit rather snugly rubber motor enough difficult get 0 ring slide rubber answer shown Photos 3 4 small diameter wire insect mounting pin shown bent double pushed through 0 ring 0 ring pushed over rubber end rubber pulled through Whether use extra 0 ring question since no doubt mind about using least After experience using 0 rings difficult accept inconvenience uncertainty involved having least 0 ring factors weighing decision model size ceiling height weight 0 ring some cases factors like fail ing eyesight poor lighting contest site enter picture simply easier see hook up 0 ring particularly plastic ones weight 0 ring typically less 0005 oz certainly minor factor FAI Stick model must weigh 0354 oz espe cially since precise control models trajectory possible other factors unchanged altitude model attains directly proportional launch torque too small model such ROG 0 ring higher proportion models fly ing weight loss few turns tiny rubber has almost negligible effect launch torque heavier indoor model power proportionally needs given model size leads problems bunching rubber knots rubbing fuselage usually effects detrimental long flights Pennyplane models com pound problem having high required weight requiring very short fuselages Although rubber model ap proaches its maximum duration rub ber weight approaches 1 s air plane weight short Pennyplane fuse lage poses such rubber handling problems few fliers manage use 80% much rubber weight airplane weight Thus rubber handling problems can solved Pennyplane times bound go up 0 rings tend help pre vent rubber bunching prep no has reported 0 ring really strong enough rubber weight already short improvement helps should o rings Pennyplane Bud Tennv Box 545 Richardson TX 75080 FF Duration/Meuser continued page 53 used several models An added feature fuse easy light check compared uusual tail mount use aluminum tubing curved parts line path plastic tubing could used Metal tubing will easily kink bent sharply use end finger thumb form bend slowly carefully radius inch less can achieved method 3/32 aluminum tubing Metal tubes should flared out bit end line will cut Twenty-pound test Da cron line works well line Other sizes types can used front tube must placed far enough rearward stab will pop up desired angle Check before mounting front hook will catch tube act limiter bend hooks out pins plenty strong enough gas model piece 1/32 ply glued around stab hole adds needed strength point rear wire will slide through hole stab placed parallel string sketch shows typical set-up large model tail-mounted fuse beyond convenient reach flier makes launching two man job small light models CG shift due burn ing fuse can change glide pattern sig nificantly aside fire hazard tail-mounted fuse makes little sense Clarences idea mounting fuse top seems like winner However internal dethermalizer strings plastic tubing running clear inlet outlet often preferred over alu minum tubing original string gets pulled out can easily replaced Twenty-pound woven Dacron Nylon line can pushed through end bends gentle monofilament line can pushed through series se vere bends extremely lightweight models weight plastic tubing might factor external DT string seems like best bet Plastic tubing selected purpose well proved can obtained NFFS Supplies 9525 Achates Cl Sacra mento CA 95826 send SASE complete price list Top following incident will undoubtedly nominated Best Grandstand Act 1978 took place recent Max-Men FAI An96 Model Aviation nual Taft Gary Medley towing A-2 towline glider attempt 14 max line slipped out hand model took off downwind good air line still attached Thinking better chasing foot Gary ran back got motorcycle chase model got low enough abandoned cycle grabbed towline towed model back field foot launched maxed Sandwiched between stormy weekends all-FAI annual meet blessed two days excellent flying weather Most Southern California regulars there good represen tation Northern Cal too Competi tors came Michigan Colorado Oklahoma too Peter Allnutt wife Canada Peters parents England Five 14 entrants A-2 Glider maxed out Bob Isaacson won 14 maxes two max-outs both Wakefield Power top honors finally going Bob Piserchio Roger Simpson Among five top fliers three events five previous US Team mem bers plus ex-World Champion Quite meet Official Manhattan Formula Rules long last perhaps rules event nailed down Until now pub lished version differed slightly other published version rules pub lished based iden tical versions published MIAMA club also con siderably different Ed Whittens orig inal rules decade ago rules under event will flown active New York group will un doubtedly local variations 1 Airframe weight less rubber 4 grams minimum 2 Overall length measured front prop bearing 20 maximum 3 Fuselage Must support enclose single rubber motor No motor sticks b Must include excede box 2 X 4 x 2 c Must havea windshield 2 sq minimum area plust window side 1 sq minimum area covered cellophane similar transparent material 4 Prop wood direct drive fixed pitch 5 Wing Monoplane maximum pro jected span 20 maximum chord 4 Wood bracing allowed 6 Stab Monoplane stab maximum projected span 8 maximum chord 3 Wood bracing allowed 7 Landing gear Rigid fixed least two wheels minimum diameter Must able support model 8 Covering Except windshield windows paper including condenser paper allowed No film Microlite 9 Flying flights least two-point ROG Best single flight counts Un limited number official flights MARIAH 300 Latest well-worn workbench Vic Cunnyngham Jr 300-square-incher intended competi tion Classes Similar Vics Sirocco published Flying Models three years ago Vic says Mariah 300 much better features three rudders following old Fast Richard concept good two better Three should just about right Vics models have parts require greater building time typical designs geodetic ribs take little time get right wing built way unlikely warp under severe conditions wing Vics recent models has over 300 parts Compare typical Nordic A-2 glider has about three times Regarding A-2 wings Bob Hatschek claims hates build models recently remarked wing looks ready cover realize still have 200 parts go Vic regards complexity thera peutic exercise end working day Built during winter Mariah has yet experience rigors competi tion history repeats well probably still hearing about 1988 Bob Meuser 4200 Gregory St Oak land CA 94619 gine turn 19000 rpm 3000 over flight rpm c third prop stand ard exactly matches test prop Paul BugI uses tests three props am able reproduce flight loads bench will able pre dict exactly engine will perform model within 1 lap 1 rpm verify performance figures another experimenter BugI FAI Team Race performance testing refined form testing currently being done rapid advances helicopter ducted fan models benefiting similar experiments development appropriate props performance testing will enable modeler predict performance Racing eventslaps speed CL Aerobatics engine response duration run Throttled enginesengine response throttle characteristics third use props flying may seem odd think flying props last Really three uses props synergistic Ive put flight props last impress upon importance break-in power performance testing procedures Flight props fall several categories applications will discussed separately Moderate Performance Props used sport flying competition flying does place exacting demands design match engine power Scale precision aerobatics sport flying examples basic rule selection props use props recom mended engine manufacturer b select available props best suits requirements c stick off-the-shelf props High Performance Special Applica tion Props used events involve high stress loads and/or special design requirements achieve optimum performance Speed racing events com bat high performance FF events place special demands props demands typically operate July1978 97 Engine Technique/Jehlik continued page 47
Edition: Model Aviation - 1978/07
Page Numbers: 52, 53, 96, 97
NO OCR TEXT NO OCR TEXT forcettoicly shey should hoow products ore worth because little historic researching fot Sowetiwes other plors ore prettier hut bosic ourheoticity detoiliog oed prototype inforwetioc glue rho t coonts whse its eufhertis wodeliog youre ofter Theres o world costly diPerenee wheo hcy CDs ecee otseoerol tiwen rho price hot os serious wodelerseod eciosion persoocol soy Nore hut CDs gioe yoc oppeoroncethe feel oldtiwers sowehew hoild thew FOR YOUR HOBBY AT R R M N M SENO St OR CATALOG SE 2 YRS SUBS St ADO tOe 1100 PLANS _________________________________ AVAILABLE 1931 Gee Bee Super Sportster 1 eeSle General Arrange ment Drawing Catalog 25c W T Bill Given MODERNISTIC MODELS PO BOX 6974 ALBUG NM 87197 adjusting engines barely ac complish required ROG maintain shallow cruising climb Engine runs over ten minutes common often attain good altitude thermal exten sion flight As can imagine large site minimal drift required event qualify event model de sign must 1938 earlier Wing span must six feet greater orig nal ignition engines allowed clas sic old birds cruising slowly overhead make excellent targets camera buff takeoff runs long slow few feet altitude gained per circle can manage several good shots Clarence Haught Rt 5 Box 16 Coeur dAlene ID 83614 FF Indoor/Tenny continued page 55 hooked twiceonce winder rubber can hooked prop shaft once unhook torquemeter easy enough hook meter prop re-check torque much lost moving motor torquemeter models rear hook Use 0 Ring purist stand point 0 ring rubber synthetic circle rubbera doughnut shape used gasket between metal fittings pressure vacuum systems indoor models 0 ring something slipped meter allows mo tor unhooked removing turns past 0 rings have made small diameter music wire bent circle hooked itself re cently either plastic rings real 0 ringsvery tiny ones-have used Photo shows plastic 0 ring motor Photo 2 shows rubber 0 ring same size motor Note rubber 0 ring fits very closely motor can advantage Because 0 ring fits snugly helps hold motor rear hook motor unwinds completely plastic 0 rings made slicing off end piece Nyrod particular brand pushrod radio con trol models After rings cut sharp edges removed boiling water 0 rings very light flier should experimentally test strength 0 rings winding motors destruction model rubber 0 rings available Ron Plotzke Aorolite 36659 Ledgestone Mt Clem ens Ml 48043 Ray Harlan 15 Happy Hollow Rd. Wayland MA 01778 As mentioned before rubber 0 rings fit rather snugly rubber motor enough difficult get 0 ring slide rubber answer shown Photos 3 4 small diameter wire insect mounting pin shown bent double pushed through 0 ring 0 ring pushed over rubber end rubber pulled through Whether use extra 0 ring question since no doubt mind about using least After experience using 0 rings difficult accept inconvenience uncertainty involved having least 0 ring factors weighing decision model size ceiling height weight 0 ring some cases factors like fail ing eyesight poor lighting contest site enter picture simply easier see hook up 0 ring particularly plastic ones weight 0 ring typically less 0005 oz certainly minor factor FAI Stick model must weigh 0354 oz espe cially since precise control models trajectory possible other factors unchanged altitude model attains directly proportional launch torque too small model such ROG 0 ring higher proportion models fly ing weight loss few turns tiny rubber has almost negligible effect launch torque heavier indoor model power proportionally needs given model size leads problems bunching rubber knots rubbing fuselage usually effects detrimental long flights Pennyplane models com pound problem having high required weight requiring very short fuselages Although rubber model ap proaches its maximum duration rub ber weight approaches 1 s air plane weight short Pennyplane fuse lage poses such rubber handling problems few fliers manage use 80% much rubber weight airplane weight Thus rubber handling problems can solved Pennyplane times bound go up 0 rings tend help pre vent rubber bunching prep no has reported 0 ring really strong enough rubber weight already short improvement helps should o rings Pennyplane Bud Tennv Box 545 Richardson TX 75080 FF Duration/Meuser continued page 53 used several models An added feature fuse easy light check compared uusual tail mount use aluminum tubing curved parts line path plastic tubing could used Metal tubing will easily kink bent sharply use end finger thumb form bend slowly carefully radius inch less can achieved method 3/32 aluminum tubing Metal tubes should flared out bit end line will cut Twenty-pound test Da cron line works well line Other sizes types can used front tube must placed far enough rearward stab will pop up desired angle Check before mounting front hook will catch tube act limiter bend hooks out pins plenty strong enough gas model piece 1/32 ply glued around stab hole adds needed strength point rear wire will slide through hole stab placed parallel string sketch shows typical set-up large model tail-mounted fuse beyond convenient reach flier makes launching two man job small light models CG shift due burn ing fuse can change glide pattern sig nificantly aside fire hazard tail-mounted fuse makes little sense Clarences idea mounting fuse top seems like winner However internal dethermalizer strings plastic tubing running clear inlet outlet often preferred over alu minum tubing original string gets pulled out can easily replaced Twenty-pound woven Dacron Nylon line can pushed through end bends gentle monofilament line can pushed through series se vere bends extremely lightweight models weight plastic tubing might factor external DT string seems like best bet Plastic tubing selected purpose well proved can obtained NFFS Supplies 9525 Achates Cl Sacra mento CA 95826 send SASE complete price list Top following incident will undoubtedly nominated Best Grandstand Act 1978 took place recent Max-Men FAI An96 Model Aviation nual Taft Gary Medley towing A-2 towline glider attempt 14 max line slipped out hand model took off downwind good air line still attached Thinking better chasing foot Gary ran back got motorcycle chase model got low enough abandoned cycle grabbed towline towed model back field foot launched maxed Sandwiched between stormy weekends all-FAI annual meet blessed two days excellent flying weather Most Southern California regulars there good represen tation Northern Cal too Competi tors came Michigan Colorado Oklahoma too Peter Allnutt wife Canada Peters parents England Five 14 entrants A-2 Glider maxed out Bob Isaacson won 14 maxes two max-outs both Wakefield Power top honors finally going Bob Piserchio Roger Simpson Among five top fliers three events five previous US Team mem bers plus ex-World Champion Quite meet Official Manhattan Formula Rules long last perhaps rules event nailed down Until now pub lished version differed slightly other published version rules pub lished based iden tical versions published MIAMA club also con siderably different Ed Whittens orig inal rules decade ago rules under event will flown active New York group will un doubtedly local variations 1 Airframe weight less rubber 4 grams minimum 2 Overall length measured front prop bearing 20 maximum 3 Fuselage Must support enclose single rubber motor No motor sticks b Must include excede box 2 X 4 x 2 c Must havea windshield 2 sq minimum area plust window side 1 sq minimum area covered cellophane similar transparent material 4 Prop wood direct drive fixed pitch 5 Wing Monoplane maximum pro jected span 20 maximum chord 4 Wood bracing allowed 6 Stab Monoplane stab maximum projected span 8 maximum chord 3 Wood bracing allowed 7 Landing gear Rigid fixed least two wheels minimum diameter Must able support model 8 Covering Except windshield windows paper including condenser paper allowed No film Microlite 9 Flying flights least two-point ROG Best single flight counts Un limited number official flights MARIAH 300 Latest well-worn workbench Vic Cunnyngham Jr 300-square-incher intended competi tion Classes Similar Vics Sirocco published Flying Models three years ago Vic says Mariah 300 much better features three rudders following old Fast Richard concept good two better Three should just about right Vics models have parts require greater building time typical designs geodetic ribs take little time get right wing built way unlikely warp under severe conditions wing Vics recent models has over 300 parts Compare typical Nordic A-2 glider has about three times Regarding A-2 wings Bob Hatschek claims hates build models recently remarked wing looks ready cover realize still have 200 parts go Vic regards complexity thera peutic exercise end working day Built during winter Mariah has yet experience rigors competi tion history repeats well probably still hearing about 1988 Bob Meuser 4200 Gregory St Oak land CA 94619 gine turn 19000 rpm 3000 over flight rpm c third prop stand ard exactly matches test prop Paul BugI uses tests three props am able reproduce flight loads bench will able pre dict exactly engine will perform model within 1 lap 1 rpm verify performance figures another experimenter BugI FAI Team Race performance testing refined form testing currently being done rapid advances helicopter ducted fan models benefiting similar experiments development appropriate props performance testing will enable modeler predict performance Racing eventslaps speed CL Aerobatics engine response duration run Throttled enginesengine response throttle characteristics third use props flying may seem odd think flying props last Really three uses props synergistic Ive put flight props last impress upon importance break-in power performance testing procedures Flight props fall several categories applications will discussed separately Moderate Performance Props used sport flying competition flying does place exacting demands design match engine power Scale precision aerobatics sport flying examples basic rule selection props use props recom mended engine manufacturer b select available props best suits requirements c stick off-the-shelf props High Performance Special Applica tion Props used events involve high stress loads and/or special design requirements achieve optimum performance Speed racing events com bat high performance FF events place special demands props demands typically operate July1978 97 Engine Technique/Jehlik continued page 47