Control Line r Aerobatics Ted Fancher LAST MONTHS discussion devoted lowly control handle strictly mechanical examination control response rate did necessarily repre sent what feel handle better understand much work have put flying beast have check out handles overhang its affects control feel Just make sure keep things straight lets repeat definition overhang distance wrist hinge-point outermost point control handle leadout wires emerge confinement han dle structure have assumed distance wrist hinge-point front handle grip 3 Both Figure II Table II derived reasonably-accurate full-scale drawings rather being done mathe matically three control handles studied respective overhangs could derived measuring distance front handle grip lineattach points adding value 34 used grip-to-wrist-hingepoint distance couple other items should men tioned too Although relatively minor overhang handle has impact line displacement therefore con trol sensitivity measurements taken control feel table Table II found overhang decreased line displacement given handle rota tion increased 300 handle rotation four-inch spacing additional line displacement measured between longest overhang experimental zero-overhang handle big deal sensitive control system can certainly felt Continued Page 145 WRI V Ted continues discussing tne sectors wnicn enter now control hanais feeis fly Stunter Last month discussed effects line spacing time heii taik about effects overhang Theres might think up M X 0 5 0 9 475 169 4575 465 ± 14 number years ago Ai Rabe popuiarlzed seml-scaie type Stunter beautifui Bearcat LTed believes its Jim Lynchs typifies concept PAM PAs 1984 presIdent Denny Adamisin has dveioping iong-winged Eoiipse design R sey erai years two shades blue plus white What looks like dark paint stripe edges shadow caused flash 70 Model Aviation U J LINE_ LB 15 ilor actually son ecial leave Navy enable sposition household items operty itself just sold Fur ermore young man intended ss some 20-odd antique engines sorted modeling paraphernalia ash can very next morning want immediate solution Obviously ir man Robert offered fellow pedient alternative cleanup oblem Supposedly brothers owned casting business back Forties id being interested Control Line eed performed some hop-up exper ients various engines such cx riment apparently special rearurn-rotor downdraft-venturi arrange ent wild exhaust extension e Brown Jr shown photo b found engine finished Lrts another set unfin ied castings among other engines id accessories also numer sketches plans CL Speed odels drawn back sllpaper evidence brothers 4 quite successful extruding ry commendable 105 mph out Hornet iwered models 1945-46 era What really amazing though fact th brothers deaf mutes Since ither could hear would determine ak engine rpm settings placing nds model assessing engine ms models vibrations Unfortunately both brothers now ceased what amazing tales gine collectors can relateand love ery Thanks again Bob LM Champs date change 1985 t report stated 1985 Medera Champs would held June -20 time bonafide tes However Jack Jella SAM Champs tnager has since announced tes have now moved June 24-27 request Eastern Midstern modelers could accom date earlier schedule money rather lean toward ving dates further nmerto point returning vious schedule mid- late-July yway parts June simply too ly flying season expect peak rnpetition levels both engines dels after long winters layoff Most having similar climate have portunity stage maybe Timer contests point ng contest-ready SAM amps fleet mid-June exceptionaccomplishment say least [t understanding idea ving dates forward calendar s proposed possible remedy ape heat warmer climes Per ially think would prefer take inces heat rather models Signal Guard blocks random noise oft-frequency signals can cause loss control air land RC models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal Guard TM major credit card send $150 check money order m 1 riFTllSFF PO Box 30179 Portland OR 97230 Oregon call collect 503-257-0912 90 day warranW cted dealershIps avaIlable out trim engines wont start what know Im managementI just work here. See ya downwind Harry Murphy 3824 Oakwood Blvd Anderson IN 46011 CL Aerobatics/Fancher Continued page 70 understand affect overhang control feel necessary understand feel handle made up inputs both Up Down lines input line made up two elements actual tensionwhich have arbitrarily stated 15 lb per lineand vertical distance point tension force applied wrist hinge-point case will measure tension pounds distance components inches resulting moment being expressed inch-pounds Take look Figure II will notice horizontal line running wrist hinge-point horizontally through center handle large Plus above large Minus below median line distance measurement will taken Any lineattach point falling above line will considered positive value thus force overcome up maneuvers Any line-attach point below line will March 1985 145 MAY 31 THROUGH JUNE2DAO 1985 First Race 85 LOCTITE Series Formula 120 Quarter Scale Pylon Race IMAA Fly-in Demonstration Control-line RIG Helicopter Sailplane Rubber Free Flight events R/G Off-road Car Racing Swap Shop Auction Static Show Prizes Trophies Banquet Childrens Events Large Exposition Hall Displays Booths 200 RV Hook-ups Site Indoor Showers Restrooms ITS FAMILY FAIR DISPLAY COMPETE OR JUST HAVE FUN Send information packet Lynn Engdahl Chairman 198 Melody Drive Akron Ohio 44321 telephone 216 666-8294 considered negative thus force helping overcome Up-line load Please note entirely possible indeed quite normal both line-attach points above median line thus both apply positive values will added together get total differential feel Remember discussing up maneuvers reverse findings will true down Measurements taken Figure II 00 150 300 450 rotation three handles four-inch line spacing Hot Rock 1 A-in overhang extensions B stock Hot Rock C handle attachpoints directly above below wrist hinge-point last handle just informational purposes suggested secret weapon will say right up front dont recommend measure ments taken entered Table II simple math done resulting differential moment feel deduced parameter Lets take couple examples see works handles 00 rotation neutral show following Up lines two inches above median line carry 15 lb loads thus plus 2 times 15 lb equals plus 30 inch-pounds Down lines two inches below median carry 15-lb loads thus minus 2 inches times 15 lb equals minus 30 inch-pounds added together plus 30 minus 30 equal 0 differential moment thus no hand pressure re quired maintain position. good level flight huh Handle B 150 shows following Up line now 315 above dian still carries 15-lb load total plus 468 lb Down line now 76 below median still carry ing 15 lb thus its load equals minus 114 in-lb Adding two algebraically plus 468 minus 114 354 in-lb Thus hand requires amount pressure maintain 150 handle rotation whatever end result elevator observe effects added over hang lets same exercise using handle its additional A-in arms 150 now find Up line 352 above median net 528 in-lb Down line now 31 below median results -465 rn-lb load thus netting total differen tial feel 4815 in-lb 35% force required get identical line-displacement achieved shorterarmed handle Lets look same two handles 300 both cases Up line diverges further above median 475 4 B respectively Most significant both handles Down line has now traveled above median now both lines pro viding positive load total differen tial magnifies proportionately Almost twice much force required case 300 measurements 450 handles B show same ratio held true handle continues require 135% force required handle B Strictly educational value lets look handle C hypothetical handle cant life figure out build theoretically attached direct ly wrist hinge point thus has no overhang Notice Up con trol applied Up line-attach point immediately starts descend medi line aft wrist hinge-point concurrently Down line attach point moves upward toward median line forward wrist hinge-point result can seen table never differential momentand thus never apparent feel generated handle built man ner would feel exactly same flier regardless handle rotation would give impression airplane being balanced right edge instability might tempted add nose weight correct case weight would have no effect con trol feel further amplify effect visualize handle has reversed arms actually attaching lines inward wrist hinge point. reverse overhang will handle will actually desta bilizing Up control applied Up line attach-point descends reducing arm thus Up line-moment Down line attach-point conversely descends away median thus increasing its moment net result greater load Down linewhich will tend increase Up deflection Suc cessful completion flight would extremely problematic same way overhang slightly affects response rate control feel also slightly affected line spacing As line spacing reduced mechanical advantage over loads increased thus slightly reducing feel must remembered however increased mechanical advantage achieved expense control deflection thus handle rotation will required given line displacement Therefore need rotation essentially cancels out lessened feel Again hardly worth consid ering balance final handle-design parameter neu trality tougher deal great deal its importance subjective therefore subject personal preference much can said some cer tainty neutral position handle should such moments above below median line balanced should result properly-trimmed ship seeking level flight almost automati cally ship has forced stay five feet yet appears built trimmed correctly good bet handles neutral position incorrect writers personal opinion repeat personal opinionthat natu ral hand positionslightly downis no-no should avoided pilot seeks compete highest level know its wrong symmetrical han dle such Hot Rock handle set down-biased neutral mismatch control feel will induced per Figure II will differential load applied handle requiring pilot main tain down-force handle keep airplane level flight addition amount down-force will have Continued page 148 146 Model Aviation applied before can start apply down-elevator outside maneuvers know fact phenomenon has led some pilots incorrect belief ships didnt turn well outside know because Ive flown handle setup turned outside just fine controversial whether handle can built grip biased natural grip fashion similar Bobby Hunts inflight-adjust able handle late Seventies would give qualified yes designer careful insure line-attach points directly above another natural position also equal distance above below median line neutral risk getting myself trouble again real good patterns Ive seen flown biased-type handle flown Bobby Hunt Bobbys flam boyant flying style lots arm body input equally unique Almost other exceptional fliers Ive watched over last 10 years flew style typified symmetrical handle held vertically between shoulder eye height level flight Most maneuvering accomplished hand wrist inputs control handle rather flamboyant arm body gestures Jimmy Casale probably balletic current fliers uses body movements primarily position himself airplane Almost actual control inputs come hand wrist plus distinctive thumb-push top handle outside corner Ip summary would appear ideal handle given airplane would t comfortable angles hand wrist motion would provide ade quate line displacement provide full available control deflection Control feel should adjusted overhang allow control loads can overcome com fortably hand wrist motion out resorting large arm gestures yet forces should made light pilot hs no feel control inputs Such condition would make flight erratic jumpy Lastly handle should designed neutral control results balanced Up Down line forces airplane stable level flight ideally opin ion handle vertical last piece advice design own handle sure include U-shaped projections above below hand grip make position index little fingers contact handle gripped addition insuring handle always gripped same posi tion projections allow minor trim ming inputs made little nudges fingers discovered impor tance through flying number ffights handle similar other respect Hot Rock-type finding myself unable fly consistent shapes bottoms Upon reverting back old handle able feel little nudges tweaks giving arms unable other handle proceeded add simple balsa arms offending handle Martine built Baron adjustable-type immedi ately fell love same handle have now used since 1977 hope proves useful Fly Stunt Ted Fancher 158 Flying Cloud Isle Foster City CA 944cJy FF Old-Timers/Haught Continued page 62 Remember uses Forster 99 less-powerful engine could get less subject powerplants aircraft needs strong 60 O&R 60 sideports have trouble lugging Powerhouse upstairs will fly smaller engines can quite well Texaco-type fuel allotment events shallow cruisingtype climb fuel economy desired recommended 20 left thrust helps establish natural left climb cabin model Sal offsets rudder tab offset right turn Thus climbs left glides right safe stable pattern OT cabin model fliers prefer glide same direction climb feeling aids smooth transition reduces possibility flying out thermal provided model launched However left-left pattern usually requires washin left wing hold panel up during climb panel going through air slower right thus needs added cidence generate lift lower airspeed help establish glide turn through increased drag would probably better off following Sals specifications fly left-right Avoid warps during covering phase construction particularly stabil izer structure does have builtin warp resistance course model like Powerhouse deserves covered silk preferably finished nitrate dope has little less tendency pull warps does butyrate Bill Baker writes informative Old-Timer column Free Flight publication National Free Flight Society wrote briefly about Power house March 1983 issue discus sion Sal revealed four- five- six-foot span versions men tioned original MAN article various sizes flown aware would allow modelers smaller engines smaller cars en joy design SAM rules allow scaling original designs up down RC use Free Flighters restricted origi nal-sizes six-footer would about right sideport O&R 60 good 29 would fly five-footer four-foot version could powered 19 23 engines final advantage Powerhouse design its forward-placed propellersaving landing gear An important feature day hand-carved propellersand still important today given high cost large-diameter propellers ward axle location also handy using heavy wheels bring balance point within limits long tail can get heavy 148 Model Aviation Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 jjSSOCIATES INC CLOUD 2658WAY KARD CA NMOA5 p SOOv UGlY_____ 2- AGMUOTS SOALK PLANES SAYS ISIS TOLD ME SO /
Edition: Model Aviation - 1985/03
Page Numbers: 70, 145, 146, 148
Edition: Model Aviation - 1985/03
Page Numbers: 70, 145, 146, 148
Control Line r Aerobatics Ted Fancher LAST MONTHS discussion devoted lowly control handle strictly mechanical examination control response rate did necessarily repre sent what feel handle better understand much work have put flying beast have check out handles overhang its affects control feel Just make sure keep things straight lets repeat definition overhang distance wrist hinge-point outermost point control handle leadout wires emerge confinement han dle structure have assumed distance wrist hinge-point front handle grip 3 Both Figure II Table II derived reasonably-accurate full-scale drawings rather being done mathe matically three control handles studied respective overhangs could derived measuring distance front handle grip lineattach points adding value 34 used grip-to-wrist-hingepoint distance couple other items should men tioned too Although relatively minor overhang handle has impact line displacement therefore con trol sensitivity measurements taken control feel table Table II found overhang decreased line displacement given handle rota tion increased 300 handle rotation four-inch spacing additional line displacement measured between longest overhang experimental zero-overhang handle big deal sensitive control system can certainly felt Continued Page 145 WRI V Ted continues discussing tne sectors wnicn enter now control hanais feeis fly Stunter Last month discussed effects line spacing time heii taik about effects overhang Theres might think up M X 0 5 0 9 475 169 4575 465 ± 14 number years ago Ai Rabe popuiarlzed seml-scaie type Stunter beautifui Bearcat LTed believes its Jim Lynchs typifies concept PAM PAs 1984 presIdent Denny Adamisin has dveioping iong-winged Eoiipse design R sey erai years two shades blue plus white What looks like dark paint stripe edges shadow caused flash 70 Model Aviation U J LINE_ LB 15 ilor actually son ecial leave Navy enable sposition household items operty itself just sold Fur ermore young man intended ss some 20-odd antique engines sorted modeling paraphernalia ash can very next morning want immediate solution Obviously ir man Robert offered fellow pedient alternative cleanup oblem Supposedly brothers owned casting business back Forties id being interested Control Line eed performed some hop-up exper ients various engines such cx riment apparently special rearurn-rotor downdraft-venturi arrange ent wild exhaust extension e Brown Jr shown photo b found engine finished Lrts another set unfin ied castings among other engines id accessories also numer sketches plans CL Speed odels drawn back sllpaper evidence brothers 4 quite successful extruding ry commendable 105 mph out Hornet iwered models 1945-46 era What really amazing though fact th brothers deaf mutes Since ither could hear would determine ak engine rpm settings placing nds model assessing engine ms models vibrations Unfortunately both brothers now ceased what amazing tales gine collectors can relateand love ery Thanks again Bob LM Champs date change 1985 t report stated 1985 Medera Champs would held June -20 time bonafide tes However Jack Jella SAM Champs tnager has since announced tes have now moved June 24-27 request Eastern Midstern modelers could accom date earlier schedule money rather lean toward ving dates further nmerto point returning vious schedule mid- late-July yway parts June simply too ly flying season expect peak rnpetition levels both engines dels after long winters layoff Most having similar climate have portunity stage maybe Timer contests point ng contest-ready SAM amps fleet mid-June exceptionaccomplishment say least [t understanding idea ving dates forward calendar s proposed possible remedy ape heat warmer climes Per ially think would prefer take inces heat rather models Signal Guard blocks random noise oft-frequency signals can cause loss control air land RC models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal Guard TM major credit card send $150 check money order m 1 riFTllSFF PO Box 30179 Portland OR 97230 Oregon call collect 503-257-0912 90 day warranW cted dealershIps avaIlable out trim engines wont start what know Im managementI just work here. See ya downwind Harry Murphy 3824 Oakwood Blvd Anderson IN 46011 CL Aerobatics/Fancher Continued page 70 understand affect overhang control feel necessary understand feel handle made up inputs both Up Down lines input line made up two elements actual tensionwhich have arbitrarily stated 15 lb per lineand vertical distance point tension force applied wrist hinge-point case will measure tension pounds distance components inches resulting moment being expressed inch-pounds Take look Figure II will notice horizontal line running wrist hinge-point horizontally through center handle large Plus above large Minus below median line distance measurement will taken Any lineattach point falling above line will considered positive value thus force overcome up maneuvers Any line-attach point below line will March 1985 145 MAY 31 THROUGH JUNE2DAO 1985 First Race 85 LOCTITE Series Formula 120 Quarter Scale Pylon Race IMAA Fly-in Demonstration Control-line RIG Helicopter Sailplane Rubber Free Flight events R/G Off-road Car Racing Swap Shop Auction Static Show Prizes Trophies Banquet Childrens Events Large Exposition Hall Displays Booths 200 RV Hook-ups Site Indoor Showers Restrooms ITS FAMILY FAIR DISPLAY COMPETE OR JUST HAVE FUN Send information packet Lynn Engdahl Chairman 198 Melody Drive Akron Ohio 44321 telephone 216 666-8294 considered negative thus force helping overcome Up-line load Please note entirely possible indeed quite normal both line-attach points above median line thus both apply positive values will added together get total differential feel Remember discussing up maneuvers reverse findings will true down Measurements taken Figure II 00 150 300 450 rotation three handles four-inch line spacing Hot Rock 1 A-in overhang extensions B stock Hot Rock C handle attachpoints directly above below wrist hinge-point last handle just informational purposes suggested secret weapon will say right up front dont recommend measure ments taken entered Table II simple math done resulting differential moment feel deduced parameter Lets take couple examples see works handles 00 rotation neutral show following Up lines two inches above median line carry 15 lb loads thus plus 2 times 15 lb equals plus 30 inch-pounds Down lines two inches below median carry 15-lb loads thus minus 2 inches times 15 lb equals minus 30 inch-pounds added together plus 30 minus 30 equal 0 differential moment thus no hand pressure re quired maintain position. good level flight huh Handle B 150 shows following Up line now 315 above dian still carries 15-lb load total plus 468 lb Down line now 76 below median still carry ing 15 lb thus its load equals minus 114 in-lb Adding two algebraically plus 468 minus 114 354 in-lb Thus hand requires amount pressure maintain 150 handle rotation whatever end result elevator observe effects added over hang lets same exercise using handle its additional A-in arms 150 now find Up line 352 above median net 528 in-lb Down line now 31 below median results -465 rn-lb load thus netting total differen tial feel 4815 in-lb 35% force required get identical line-displacement achieved shorterarmed handle Lets look same two handles 300 both cases Up line diverges further above median 475 4 B respectively Most significant both handles Down line has now traveled above median now both lines pro viding positive load total differen tial magnifies proportionately Almost twice much force required case 300 measurements 450 handles B show same ratio held true handle continues require 135% force required handle B Strictly educational value lets look handle C hypothetical handle cant life figure out build theoretically attached direct ly wrist hinge point thus has no overhang Notice Up con trol applied Up line-attach point immediately starts descend medi line aft wrist hinge-point concurrently Down line attach point moves upward toward median line forward wrist hinge-point result can seen table never differential momentand thus never apparent feel generated handle built man ner would feel exactly same flier regardless handle rotation would give impression airplane being balanced right edge instability might tempted add nose weight correct case weight would have no effect con trol feel further amplify effect visualize handle has reversed arms actually attaching lines inward wrist hinge point. reverse overhang will handle will actually desta bilizing Up control applied Up line attach-point descends reducing arm thus Up line-moment Down line attach-point conversely descends away median thus increasing its moment net result greater load Down linewhich will tend increase Up deflection Suc cessful completion flight would extremely problematic same way overhang slightly affects response rate control feel also slightly affected line spacing As line spacing reduced mechanical advantage over loads increased thus slightly reducing feel must remembered however increased mechanical advantage achieved expense control deflection thus handle rotation will required given line displacement Therefore need rotation essentially cancels out lessened feel Again hardly worth consid ering balance final handle-design parameter neu trality tougher deal great deal its importance subjective therefore subject personal preference much can said some cer tainty neutral position handle should such moments above below median line balanced should result properly-trimmed ship seeking level flight almost automati cally ship has forced stay five feet yet appears built trimmed correctly good bet handles neutral position incorrect writers personal opinion repeat personal opinionthat natu ral hand positionslightly downis no-no should avoided pilot seeks compete highest level know its wrong symmetrical han dle such Hot Rock handle set down-biased neutral mismatch control feel will induced per Figure II will differential load applied handle requiring pilot main tain down-force handle keep airplane level flight addition amount down-force will have Continued page 148 146 Model Aviation applied before can start apply down-elevator outside maneuvers know fact phenomenon has led some pilots incorrect belief ships didnt turn well outside know because Ive flown handle setup turned outside just fine controversial whether handle can built grip biased natural grip fashion similar Bobby Hunts inflight-adjust able handle late Seventies would give qualified yes designer careful insure line-attach points directly above another natural position also equal distance above below median line neutral risk getting myself trouble again real good patterns Ive seen flown biased-type handle flown Bobby Hunt Bobbys flam boyant flying style lots arm body input equally unique Almost other exceptional fliers Ive watched over last 10 years flew style typified symmetrical handle held vertically between shoulder eye height level flight Most maneuvering accomplished hand wrist inputs control handle rather flamboyant arm body gestures Jimmy Casale probably balletic current fliers uses body movements primarily position himself airplane Almost actual control inputs come hand wrist plus distinctive thumb-push top handle outside corner Ip summary would appear ideal handle given airplane would t comfortable angles hand wrist motion would provide ade quate line displacement provide full available control deflection Control feel should adjusted overhang allow control loads can overcome com fortably hand wrist motion out resorting large arm gestures yet forces should made light pilot hs no feel control inputs Such condition would make flight erratic jumpy Lastly handle should designed neutral control results balanced Up Down line forces airplane stable level flight ideally opin ion handle vertical last piece advice design own handle sure include U-shaped projections above below hand grip make position index little fingers contact handle gripped addition insuring handle always gripped same posi tion projections allow minor trim ming inputs made little nudges fingers discovered impor tance through flying number ffights handle similar other respect Hot Rock-type finding myself unable fly consistent shapes bottoms Upon reverting back old handle able feel little nudges tweaks giving arms unable other handle proceeded add simple balsa arms offending handle Martine built Baron adjustable-type immedi ately fell love same handle have now used since 1977 hope proves useful Fly Stunt Ted Fancher 158 Flying Cloud Isle Foster City CA 944cJy FF Old-Timers/Haught Continued page 62 Remember uses Forster 99 less-powerful engine could get less subject powerplants aircraft needs strong 60 O&R 60 sideports have trouble lugging Powerhouse upstairs will fly smaller engines can quite well Texaco-type fuel allotment events shallow cruisingtype climb fuel economy desired recommended 20 left thrust helps establish natural left climb cabin model Sal offsets rudder tab offset right turn Thus climbs left glides right safe stable pattern OT cabin model fliers prefer glide same direction climb feeling aids smooth transition reduces possibility flying out thermal provided model launched However left-left pattern usually requires washin left wing hold panel up during climb panel going through air slower right thus needs added cidence generate lift lower airspeed help establish glide turn through increased drag would probably better off following Sals specifications fly left-right Avoid warps during covering phase construction particularly stabil izer structure does have builtin warp resistance course model like Powerhouse deserves covered silk preferably finished nitrate dope has little less tendency pull warps does butyrate Bill Baker writes informative Old-Timer column Free Flight publication National Free Flight Society wrote briefly about Power house March 1983 issue discus sion Sal revealed four- five- six-foot span versions men tioned original MAN article various sizes flown aware would allow modelers smaller engines smaller cars en joy design SAM rules allow scaling original designs up down RC use Free Flighters restricted origi nal-sizes six-footer would about right sideport O&R 60 good 29 would fly five-footer four-foot version could powered 19 23 engines final advantage Powerhouse design its forward-placed propellersaving landing gear An important feature day hand-carved propellersand still important today given high cost large-diameter propellers ward axle location also handy using heavy wheels bring balance point within limits long tail can get heavy 148 Model Aviation Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 jjSSOCIATES INC CLOUD 2658WAY KARD CA NMOA5 p SOOv UGlY_____ 2- AGMUOTS SOALK PLANES SAYS ISIS TOLD ME SO /
Edition: Model Aviation - 1985/03
Page Numbers: 70, 145, 146, 148
Control Line r Aerobatics Ted Fancher LAST MONTHS discussion devoted lowly control handle strictly mechanical examination control response rate did necessarily repre sent what feel handle better understand much work have put flying beast have check out handles overhang its affects control feel Just make sure keep things straight lets repeat definition overhang distance wrist hinge-point outermost point control handle leadout wires emerge confinement han dle structure have assumed distance wrist hinge-point front handle grip 3 Both Figure II Table II derived reasonably-accurate full-scale drawings rather being done mathe matically three control handles studied respective overhangs could derived measuring distance front handle grip lineattach points adding value 34 used grip-to-wrist-hingepoint distance couple other items should men tioned too Although relatively minor overhang handle has impact line displacement therefore con trol sensitivity measurements taken control feel table Table II found overhang decreased line displacement given handle rota tion increased 300 handle rotation four-inch spacing additional line displacement measured between longest overhang experimental zero-overhang handle big deal sensitive control system can certainly felt Continued Page 145 WRI V Ted continues discussing tne sectors wnicn enter now control hanais feeis fly Stunter Last month discussed effects line spacing time heii taik about effects overhang Theres might think up M X 0 5 0 9 475 169 4575 465 ± 14 number years ago Ai Rabe popuiarlzed seml-scaie type Stunter beautifui Bearcat LTed believes its Jim Lynchs typifies concept PAM PAs 1984 presIdent Denny Adamisin has dveioping iong-winged Eoiipse design R sey erai years two shades blue plus white What looks like dark paint stripe edges shadow caused flash 70 Model Aviation U J LINE_ LB 15 ilor actually son ecial leave Navy enable sposition household items operty itself just sold Fur ermore young man intended ss some 20-odd antique engines sorted modeling paraphernalia ash can very next morning want immediate solution Obviously ir man Robert offered fellow pedient alternative cleanup oblem Supposedly brothers owned casting business back Forties id being interested Control Line eed performed some hop-up exper ients various engines such cx riment apparently special rearurn-rotor downdraft-venturi arrange ent wild exhaust extension e Brown Jr shown photo b found engine finished Lrts another set unfin ied castings among other engines id accessories also numer sketches plans CL Speed odels drawn back sllpaper evidence brothers 4 quite successful extruding ry commendable 105 mph out Hornet iwered models 1945-46 era What really amazing though fact th brothers deaf mutes Since ither could hear would determine ak engine rpm settings placing nds model assessing engine ms models vibrations Unfortunately both brothers now ceased what amazing tales gine collectors can relateand love ery Thanks again Bob LM Champs date change 1985 t report stated 1985 Medera Champs would held June -20 time bonafide tes However Jack Jella SAM Champs tnager has since announced tes have now moved June 24-27 request Eastern Midstern modelers could accom date earlier schedule money rather lean toward ving dates further nmerto point returning vious schedule mid- late-July yway parts June simply too ly flying season expect peak rnpetition levels both engines dels after long winters layoff Most having similar climate have portunity stage maybe Timer contests point ng contest-ready SAM amps fleet mid-June exceptionaccomplishment say least [t understanding idea ving dates forward calendar s proposed possible remedy ape heat warmer climes Per ially think would prefer take inces heat rather models Signal Guard blocks random noise oft-frequency signals can cause loss control air land RC models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal Guard TM major credit card send $150 check money order m 1 riFTllSFF PO Box 30179 Portland OR 97230 Oregon call collect 503-257-0912 90 day warranW cted dealershIps avaIlable out trim engines wont start what know Im managementI just work here. See ya downwind Harry Murphy 3824 Oakwood Blvd Anderson IN 46011 CL Aerobatics/Fancher Continued page 70 understand affect overhang control feel necessary understand feel handle made up inputs both Up Down lines input line made up two elements actual tensionwhich have arbitrarily stated 15 lb per lineand vertical distance point tension force applied wrist hinge-point case will measure tension pounds distance components inches resulting moment being expressed inch-pounds Take look Figure II will notice horizontal line running wrist hinge-point horizontally through center handle large Plus above large Minus below median line distance measurement will taken Any lineattach point falling above line will considered positive value thus force overcome up maneuvers Any line-attach point below line will March 1985 145 MAY 31 THROUGH JUNE2DAO 1985 First Race 85 LOCTITE Series Formula 120 Quarter Scale Pylon Race IMAA Fly-in Demonstration Control-line RIG Helicopter Sailplane Rubber Free Flight events R/G Off-road Car Racing Swap Shop Auction Static Show Prizes Trophies Banquet Childrens Events Large Exposition Hall Displays Booths 200 RV Hook-ups Site Indoor Showers Restrooms ITS FAMILY FAIR DISPLAY COMPETE OR JUST HAVE FUN Send information packet Lynn Engdahl Chairman 198 Melody Drive Akron Ohio 44321 telephone 216 666-8294 considered negative thus force helping overcome Up-line load Please note entirely possible indeed quite normal both line-attach points above median line thus both apply positive values will added together get total differential feel Remember discussing up maneuvers reverse findings will true down Measurements taken Figure II 00 150 300 450 rotation three handles four-inch line spacing Hot Rock 1 A-in overhang extensions B stock Hot Rock C handle attachpoints directly above below wrist hinge-point last handle just informational purposes suggested secret weapon will say right up front dont recommend measure ments taken entered Table II simple math done resulting differential moment feel deduced parameter Lets take couple examples see works handles 00 rotation neutral show following Up lines two inches above median line carry 15 lb loads thus plus 2 times 15 lb equals plus 30 inch-pounds Down lines two inches below median carry 15-lb loads thus minus 2 inches times 15 lb equals minus 30 inch-pounds added together plus 30 minus 30 equal 0 differential moment thus no hand pressure re quired maintain position. good level flight huh Handle B 150 shows following Up line now 315 above dian still carries 15-lb load total plus 468 lb Down line now 76 below median still carry ing 15 lb thus its load equals minus 114 in-lb Adding two algebraically plus 468 minus 114 354 in-lb Thus hand requires amount pressure maintain 150 handle rotation whatever end result elevator observe effects added over hang lets same exercise using handle its additional A-in arms 150 now find Up line 352 above median net 528 in-lb Down line now 31 below median results -465 rn-lb load thus netting total differen tial feel 4815 in-lb 35% force required get identical line-displacement achieved shorterarmed handle Lets look same two handles 300 both cases Up line diverges further above median 475 4 B respectively Most significant both handles Down line has now traveled above median now both lines pro viding positive load total differen tial magnifies proportionately Almost twice much force required case 300 measurements 450 handles B show same ratio held true handle continues require 135% force required handle B Strictly educational value lets look handle C hypothetical handle cant life figure out build theoretically attached direct ly wrist hinge point thus has no overhang Notice Up con trol applied Up line-attach point immediately starts descend medi line aft wrist hinge-point concurrently Down line attach point moves upward toward median line forward wrist hinge-point result can seen table never differential momentand thus never apparent feel generated handle built man ner would feel exactly same flier regardless handle rotation would give impression airplane being balanced right edge instability might tempted add nose weight correct case weight would have no effect con trol feel further amplify effect visualize handle has reversed arms actually attaching lines inward wrist hinge point. reverse overhang will handle will actually desta bilizing Up control applied Up line attach-point descends reducing arm thus Up line-moment Down line attach-point conversely descends away median thus increasing its moment net result greater load Down linewhich will tend increase Up deflection Suc cessful completion flight would extremely problematic same way overhang slightly affects response rate control feel also slightly affected line spacing As line spacing reduced mechanical advantage over loads increased thus slightly reducing feel must remembered however increased mechanical advantage achieved expense control deflection thus handle rotation will required given line displacement Therefore need rotation essentially cancels out lessened feel Again hardly worth consid ering balance final handle-design parameter neu trality tougher deal great deal its importance subjective therefore subject personal preference much can said some cer tainty neutral position handle should such moments above below median line balanced should result properly-trimmed ship seeking level flight almost automati cally ship has forced stay five feet yet appears built trimmed correctly good bet handles neutral position incorrect writers personal opinion repeat personal opinionthat natu ral hand positionslightly downis no-no should avoided pilot seeks compete highest level know its wrong symmetrical han dle such Hot Rock handle set down-biased neutral mismatch control feel will induced per Figure II will differential load applied handle requiring pilot main tain down-force handle keep airplane level flight addition amount down-force will have Continued page 148 146 Model Aviation applied before can start apply down-elevator outside maneuvers know fact phenomenon has led some pilots incorrect belief ships didnt turn well outside know because Ive flown handle setup turned outside just fine controversial whether handle can built grip biased natural grip fashion similar Bobby Hunts inflight-adjust able handle late Seventies would give qualified yes designer careful insure line-attach points directly above another natural position also equal distance above below median line neutral risk getting myself trouble again real good patterns Ive seen flown biased-type handle flown Bobby Hunt Bobbys flam boyant flying style lots arm body input equally unique Almost other exceptional fliers Ive watched over last 10 years flew style typified symmetrical handle held vertically between shoulder eye height level flight Most maneuvering accomplished hand wrist inputs control handle rather flamboyant arm body gestures Jimmy Casale probably balletic current fliers uses body movements primarily position himself airplane Almost actual control inputs come hand wrist plus distinctive thumb-push top handle outside corner Ip summary would appear ideal handle given airplane would t comfortable angles hand wrist motion would provide ade quate line displacement provide full available control deflection Control feel should adjusted overhang allow control loads can overcome com fortably hand wrist motion out resorting large arm gestures yet forces should made light pilot hs no feel control inputs Such condition would make flight erratic jumpy Lastly handle should designed neutral control results balanced Up Down line forces airplane stable level flight ideally opin ion handle vertical last piece advice design own handle sure include U-shaped projections above below hand grip make position index little fingers contact handle gripped addition insuring handle always gripped same posi tion projections allow minor trim ming inputs made little nudges fingers discovered impor tance through flying number ffights handle similar other respect Hot Rock-type finding myself unable fly consistent shapes bottoms Upon reverting back old handle able feel little nudges tweaks giving arms unable other handle proceeded add simple balsa arms offending handle Martine built Baron adjustable-type immedi ately fell love same handle have now used since 1977 hope proves useful Fly Stunt Ted Fancher 158 Flying Cloud Isle Foster City CA 944cJy FF Old-Timers/Haught Continued page 62 Remember uses Forster 99 less-powerful engine could get less subject powerplants aircraft needs strong 60 O&R 60 sideports have trouble lugging Powerhouse upstairs will fly smaller engines can quite well Texaco-type fuel allotment events shallow cruisingtype climb fuel economy desired recommended 20 left thrust helps establish natural left climb cabin model Sal offsets rudder tab offset right turn Thus climbs left glides right safe stable pattern OT cabin model fliers prefer glide same direction climb feeling aids smooth transition reduces possibility flying out thermal provided model launched However left-left pattern usually requires washin left wing hold panel up during climb panel going through air slower right thus needs added cidence generate lift lower airspeed help establish glide turn through increased drag would probably better off following Sals specifications fly left-right Avoid warps during covering phase construction particularly stabil izer structure does have builtin warp resistance course model like Powerhouse deserves covered silk preferably finished nitrate dope has little less tendency pull warps does butyrate Bill Baker writes informative Old-Timer column Free Flight publication National Free Flight Society wrote briefly about Power house March 1983 issue discus sion Sal revealed four- five- six-foot span versions men tioned original MAN article various sizes flown aware would allow modelers smaller engines smaller cars en joy design SAM rules allow scaling original designs up down RC use Free Flighters restricted origi nal-sizes six-footer would about right sideport O&R 60 good 29 would fly five-footer four-foot version could powered 19 23 engines final advantage Powerhouse design its forward-placed propellersaving landing gear An important feature day hand-carved propellersand still important today given high cost large-diameter propellers ward axle location also handy using heavy wheels bring balance point within limits long tail can get heavy 148 Model Aviation Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 jjSSOCIATES INC CLOUD 2658WAY KARD CA NMOA5 p SOOv UGlY_____ 2- AGMUOTS SOALK PLANES SAYS ISIS TOLD ME SO /
Edition: Model Aviation - 1985/03
Page Numbers: 70, 145, 146, 148
Control Line r Aerobatics Ted Fancher LAST MONTHS discussion devoted lowly control handle strictly mechanical examination control response rate did necessarily repre sent what feel handle better understand much work have put flying beast have check out handles overhang its affects control feel Just make sure keep things straight lets repeat definition overhang distance wrist hinge-point outermost point control handle leadout wires emerge confinement han dle structure have assumed distance wrist hinge-point front handle grip 3 Both Figure II Table II derived reasonably-accurate full-scale drawings rather being done mathe matically three control handles studied respective overhangs could derived measuring distance front handle grip lineattach points adding value 34 used grip-to-wrist-hingepoint distance couple other items should men tioned too Although relatively minor overhang handle has impact line displacement therefore con trol sensitivity measurements taken control feel table Table II found overhang decreased line displacement given handle rota tion increased 300 handle rotation four-inch spacing additional line displacement measured between longest overhang experimental zero-overhang handle big deal sensitive control system can certainly felt Continued Page 145 WRI V Ted continues discussing tne sectors wnicn enter now control hanais feeis fly Stunter Last month discussed effects line spacing time heii taik about effects overhang Theres might think up M X 0 5 0 9 475 169 4575 465 ± 14 number years ago Ai Rabe popuiarlzed seml-scaie type Stunter beautifui Bearcat LTed believes its Jim Lynchs typifies concept PAM PAs 1984 presIdent Denny Adamisin has dveioping iong-winged Eoiipse design R sey erai years two shades blue plus white What looks like dark paint stripe edges shadow caused flash 70 Model Aviation U J LINE_ LB 15 ilor actually son ecial leave Navy enable sposition household items operty itself just sold Fur ermore young man intended ss some 20-odd antique engines sorted modeling paraphernalia ash can very next morning want immediate solution Obviously ir man Robert offered fellow pedient alternative cleanup oblem Supposedly brothers owned casting business back Forties id being interested Control Line eed performed some hop-up exper ients various engines such cx riment apparently special rearurn-rotor downdraft-venturi arrange ent wild exhaust extension e Brown Jr shown photo b found engine finished Lrts another set unfin ied castings among other engines id accessories also numer sketches plans CL Speed odels drawn back sllpaper evidence brothers 4 quite successful extruding ry commendable 105 mph out Hornet iwered models 1945-46 era What really amazing though fact th brothers deaf mutes Since ither could hear would determine ak engine rpm settings placing nds model assessing engine ms models vibrations Unfortunately both brothers now ceased what amazing tales gine collectors can relateand love ery Thanks again Bob LM Champs date change 1985 t report stated 1985 Medera Champs would held June -20 time bonafide tes However Jack Jella SAM Champs tnager has since announced tes have now moved June 24-27 request Eastern Midstern modelers could accom date earlier schedule money rather lean toward ving dates further nmerto point returning vious schedule mid- late-July yway parts June simply too ly flying season expect peak rnpetition levels both engines dels after long winters layoff Most having similar climate have portunity stage maybe Timer contests point ng contest-ready SAM amps fleet mid-June exceptionaccomplishment say least [t understanding idea ving dates forward calendar s proposed possible remedy ape heat warmer climes Per ially think would prefer take inces heat rather models Signal Guard blocks random noise oft-frequency signals can cause loss control air land RC models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal Guard TM major credit card send $150 check money order m 1 riFTllSFF PO Box 30179 Portland OR 97230 Oregon call collect 503-257-0912 90 day warranW cted dealershIps avaIlable out trim engines wont start what know Im managementI just work here. See ya downwind Harry Murphy 3824 Oakwood Blvd Anderson IN 46011 CL Aerobatics/Fancher Continued page 70 understand affect overhang control feel necessary understand feel handle made up inputs both Up Down lines input line made up two elements actual tensionwhich have arbitrarily stated 15 lb per lineand vertical distance point tension force applied wrist hinge-point case will measure tension pounds distance components inches resulting moment being expressed inch-pounds Take look Figure II will notice horizontal line running wrist hinge-point horizontally through center handle large Plus above large Minus below median line distance measurement will taken Any lineattach point falling above line will considered positive value thus force overcome up maneuvers Any line-attach point below line will March 1985 145 MAY 31 THROUGH JUNE2DAO 1985 First Race 85 LOCTITE Series Formula 120 Quarter Scale Pylon Race IMAA Fly-in Demonstration Control-line RIG Helicopter Sailplane Rubber Free Flight events R/G Off-road Car Racing Swap Shop Auction Static Show Prizes Trophies Banquet Childrens Events Large Exposition Hall Displays Booths 200 RV Hook-ups Site Indoor Showers Restrooms ITS FAMILY FAIR DISPLAY COMPETE OR JUST HAVE FUN Send information packet Lynn Engdahl Chairman 198 Melody Drive Akron Ohio 44321 telephone 216 666-8294 considered negative thus force helping overcome Up-line load Please note entirely possible indeed quite normal both line-attach points above median line thus both apply positive values will added together get total differential feel Remember discussing up maneuvers reverse findings will true down Measurements taken Figure II 00 150 300 450 rotation three handles four-inch line spacing Hot Rock 1 A-in overhang extensions B stock Hot Rock C handle attachpoints directly above below wrist hinge-point last handle just informational purposes suggested secret weapon will say right up front dont recommend measure ments taken entered Table II simple math done resulting differential moment feel deduced parameter Lets take couple examples see works handles 00 rotation neutral show following Up lines two inches above median line carry 15 lb loads thus plus 2 times 15 lb equals plus 30 inch-pounds Down lines two inches below median carry 15-lb loads thus minus 2 inches times 15 lb equals minus 30 inch-pounds added together plus 30 minus 30 equal 0 differential moment thus no hand pressure re quired maintain position. good level flight huh Handle B 150 shows following Up line now 315 above dian still carries 15-lb load total plus 468 lb Down line now 76 below median still carry ing 15 lb thus its load equals minus 114 in-lb Adding two algebraically plus 468 minus 114 354 in-lb Thus hand requires amount pressure maintain 150 handle rotation whatever end result elevator observe effects added over hang lets same exercise using handle its additional A-in arms 150 now find Up line 352 above median net 528 in-lb Down line now 31 below median results -465 rn-lb load thus netting total differen tial feel 4815 in-lb 35% force required get identical line-displacement achieved shorterarmed handle Lets look same two handles 300 both cases Up line diverges further above median 475 4 B respectively Most significant both handles Down line has now traveled above median now both lines pro viding positive load total differen tial magnifies proportionately Almost twice much force required case 300 measurements 450 handles B show same ratio held true handle continues require 135% force required handle B Strictly educational value lets look handle C hypothetical handle cant life figure out build theoretically attached direct ly wrist hinge point thus has no overhang Notice Up con trol applied Up line-attach point immediately starts descend medi line aft wrist hinge-point concurrently Down line attach point moves upward toward median line forward wrist hinge-point result can seen table never differential momentand thus never apparent feel generated handle built man ner would feel exactly same flier regardless handle rotation would give impression airplane being balanced right edge instability might tempted add nose weight correct case weight would have no effect con trol feel further amplify effect visualize handle has reversed arms actually attaching lines inward wrist hinge point. reverse overhang will handle will actually desta bilizing Up control applied Up line attach-point descends reducing arm thus Up line-moment Down line attach-point conversely descends away median thus increasing its moment net result greater load Down linewhich will tend increase Up deflection Suc cessful completion flight would extremely problematic same way overhang slightly affects response rate control feel also slightly affected line spacing As line spacing reduced mechanical advantage over loads increased thus slightly reducing feel must remembered however increased mechanical advantage achieved expense control deflection thus handle rotation will required given line displacement Therefore need rotation essentially cancels out lessened feel Again hardly worth consid ering balance final handle-design parameter neu trality tougher deal great deal its importance subjective therefore subject personal preference much can said some cer tainty neutral position handle should such moments above below median line balanced should result properly-trimmed ship seeking level flight almost automati cally ship has forced stay five feet yet appears built trimmed correctly good bet handles neutral position incorrect writers personal opinion repeat personal opinionthat natu ral hand positionslightly downis no-no should avoided pilot seeks compete highest level know its wrong symmetrical han dle such Hot Rock handle set down-biased neutral mismatch control feel will induced per Figure II will differential load applied handle requiring pilot main tain down-force handle keep airplane level flight addition amount down-force will have Continued page 148 146 Model Aviation applied before can start apply down-elevator outside maneuvers know fact phenomenon has led some pilots incorrect belief ships didnt turn well outside know because Ive flown handle setup turned outside just fine controversial whether handle can built grip biased natural grip fashion similar Bobby Hunts inflight-adjust able handle late Seventies would give qualified yes designer careful insure line-attach points directly above another natural position also equal distance above below median line neutral risk getting myself trouble again real good patterns Ive seen flown biased-type handle flown Bobby Hunt Bobbys flam boyant flying style lots arm body input equally unique Almost other exceptional fliers Ive watched over last 10 years flew style typified symmetrical handle held vertically between shoulder eye height level flight Most maneuvering accomplished hand wrist inputs control handle rather flamboyant arm body gestures Jimmy Casale probably balletic current fliers uses body movements primarily position himself airplane Almost actual control inputs come hand wrist plus distinctive thumb-push top handle outside corner Ip summary would appear ideal handle given airplane would t comfortable angles hand wrist motion would provide ade quate line displacement provide full available control deflection Control feel should adjusted overhang allow control loads can overcome com fortably hand wrist motion out resorting large arm gestures yet forces should made light pilot hs no feel control inputs Such condition would make flight erratic jumpy Lastly handle should designed neutral control results balanced Up Down line forces airplane stable level flight ideally opin ion handle vertical last piece advice design own handle sure include U-shaped projections above below hand grip make position index little fingers contact handle gripped addition insuring handle always gripped same posi tion projections allow minor trim ming inputs made little nudges fingers discovered impor tance through flying number ffights handle similar other respect Hot Rock-type finding myself unable fly consistent shapes bottoms Upon reverting back old handle able feel little nudges tweaks giving arms unable other handle proceeded add simple balsa arms offending handle Martine built Baron adjustable-type immedi ately fell love same handle have now used since 1977 hope proves useful Fly Stunt Ted Fancher 158 Flying Cloud Isle Foster City CA 944cJy FF Old-Timers/Haught Continued page 62 Remember uses Forster 99 less-powerful engine could get less subject powerplants aircraft needs strong 60 O&R 60 sideports have trouble lugging Powerhouse upstairs will fly smaller engines can quite well Texaco-type fuel allotment events shallow cruisingtype climb fuel economy desired recommended 20 left thrust helps establish natural left climb cabin model Sal offsets rudder tab offset right turn Thus climbs left glides right safe stable pattern OT cabin model fliers prefer glide same direction climb feeling aids smooth transition reduces possibility flying out thermal provided model launched However left-left pattern usually requires washin left wing hold panel up during climb panel going through air slower right thus needs added cidence generate lift lower airspeed help establish glide turn through increased drag would probably better off following Sals specifications fly left-right Avoid warps during covering phase construction particularly stabil izer structure does have builtin warp resistance course model like Powerhouse deserves covered silk preferably finished nitrate dope has little less tendency pull warps does butyrate Bill Baker writes informative Old-Timer column Free Flight publication National Free Flight Society wrote briefly about Power house March 1983 issue discus sion Sal revealed four- five- six-foot span versions men tioned original MAN article various sizes flown aware would allow modelers smaller engines smaller cars en joy design SAM rules allow scaling original designs up down RC use Free Flighters restricted origi nal-sizes six-footer would about right sideport O&R 60 good 29 would fly five-footer four-foot version could powered 19 23 engines final advantage Powerhouse design its forward-placed propellersaving landing gear An important feature day hand-carved propellersand still important today given high cost large-diameter propellers ward axle location also handy using heavy wheels bring balance point within limits long tail can get heavy 148 Model Aviation Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 jjSSOCIATES INC CLOUD 2658WAY KARD CA NMOA5 p SOOv UGlY_____ 2- AGMUOTS SOALK PLANES SAYS ISIS TOLD ME SO /
