TELL what month lets talk about warts What Warts Ted says along thought Model Aviation official journal Academy Model Aeronautics Ameri can Medical Association What warts have Control Line Stunt Good question says However warts going discuss grow trailing edge outboard flaps some Stunt ships tired tootsies Warts small projec tions added outermost end outboard flaps successful Stunterssuch 1986 Nats-winning Citation V see photo Some unsophisticated modelers might refer control surface tab still wart define wart state-of-the-art aero dynamic refinement added otherwise sound design during flight testing cover up signifi cant design deficiency case deficien cy improper balance aircraft weight wing tip weight wing asymmetry Lets dis cuss First lets state what has noth ing counteracting warped wing misaligned flap etc Ringmaster sports similar wart purpose correcting twisted wing Such wart deflected act aileron level wings could term control tab since its purpose provide con tinuous control input counteract warped wing accomplish much same thing tweak flap flapped Stunter counteract warp call wart will discuss month tab name appropriate since its task provide additional lift outboard wing requiredspecifically ma neuvering As Ive discussed numerous times over years important trimming tasks encounter Stunt achieve wings-level attitude throughout flight level wemean wings constantly line control lines attitude achieved through balancing lift produced wing weight asked carry As long weight sup ported wing no less lift produced wings will remain line control lines smooth controllable maneu vering will result no tendency bank out circle primary means achieving balance through wing tip weight and/or wing asymmetry Because fly circle outboard wing al ways flying slightly faster inboard Since lift increases square velocity outboard wing will produce lift thus tend fly higher Either moving fuselage out board wing centerline resulting longer inboard wing what call asymmetry adding wing tip weight will counteract adContinued page 180 80 Model Aviation Control Line Aerobatics Ted Fancher 158 FlyIng Cloud Isle Foster City CA 94404 CL club Breitenbach W Germany owns its own flying fieldthe area between woods pathway Flying 60-fl lines puts plane just three feet off fence Ron Heisers Texas Twister modified Sig Twister inspired Teds Fancherized Twister August 1987 issue Plane fea tures Fox 35 equipped JTec No 404 muffler 4-oz Sullivan RST-4 clunk tank utilizes muffler pressure Wing cov ered heavy silkspan Sig Supercoat dope Ron says seems pretty fair effort 60-year-old line twister Tamas Tokal R second-best CIPA flier Hungary according West Ger manys Claus Maikis Planes finish could better good lacquer available Hun gary Claus says Tamas consistent flier Look tip end flap Fanchers plane 1 ugly growth trailing edge what Ted calls wartand month tells about such things necessary Derek Barrys Limitation R scaled-down 51 wingspan profile version Fanchers Imitation design Power appears OS 35/40 FP Dale Barry photo Dale Derek Barry part Atlanta Stunt Conspiracy gang hours good flying great sense selfsatisfaction Once again must credit thank Gerry Deneau Aurora CO lions share ideas thoughts presentation Sport Scale rules Sport Scale Scoresheet Committee has formed Response request help standardizing Sport Scale scoresheet competition rule book has good following will serve committee Gerry Deneau 6464 So Andes P1 Aurora CO 80016 Charles Bauer 4944 No Orange Aye Norride IL 60656 Mike Welshans 976 Pear son Ferndale MI 48220 William Rammage 411 North 5th Ave Tucson AZ 85705 writer address top column have ideas suggestions concerning Sport Scale scoresheets appeared July 89 column am sure abovenamed would glad hear Dont miss out opportunity heard Please send ideas contest reports especially photos CL Scale address found very top column CL Aerobatics/Fancher Continued page 80 ditional lift cause wings fly level early Stunters common cure con siderable amount wing asymmetry deBolt designed American Sr instance inboard wing nearly three inches longer outboard utilized no tip weight Ares Chief Nobler others vintage era inboard wings roughly two inches longer anywhere zero ounce wing tip weight lighter overall weight less lip weight would called ships wingspans roughly 50 very competitive time Modern Stunters much larger span aver aging 60 often have little no asymmetry Equal-span wings common designers advocate reasons germane current discussion com mon denominator equal- nearly span ships need significant amounts tip weight Three four ounces often necessary counteract additional lift faster flying equal-size outboard wing So far problem its solution seem sim ple outboard wing too large flies high because its excess lift simply load down tip weight until dont no mo lem solved yes Well actly Unfortunately three-ounce whatever tip weight weighs three ounces level flight Any time maneuver ship de velop significant acceleration G loads three-ounce mass proportionately multi plied Because wing tip weight concentrated mass high-density material located fafr lat eral distance models CG its effect greater mass inboard wing statically balances one-G level flight 15G hard corner becomes 45 ozand thats good news bad news apologies Paul Walker since 45 oz generated 30 outboard center-of-gravity gen erates rolling moment about CG result tendency bank away pilot during maneuvers Stunters call banking tendency hinging Hinging ob vious during hard corners such bottom right Triangle outboard wing might drop far visible pilot its major error expert pilot should recognize undesirable trim con dition might adversely affect score should able properly evaluate correct correctly diagnose hinging important observe three distinct symptoms First level flightboth upright invert edthe wings should absolutely level outboard wing up plane attitude down its opposite attitude have warp must corrected its up both waysor down both waystip weight should added subtracted appropriate step assures static balance tip weight lift correct level flight Second accurately possible must certained lead-outs correctly placed Improperly located lead-outs especially too far aft can also induce hinging good ballpark cri teria observe outboard wheel vis ible just slightly aft inboard calm air assuming landing gear accurately aligned start ordinary 35- 60-powered ship midpoint lead-outs falls within 1 1 aft CG mea sured wing tip can consider ade quate purpose Thirdand importantyou must consist ently observe bottom outboard wing visible inside maneuvers top visible outside maneuvers Perhaps obvious place observe intersec 180 Model Aviation SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane fl PRECISION UEEPRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 Duracraft Inc / 1007 Orchard Grove Drive Royal Oak MI 48067 DuraPlane IlThe trainer rugged enough teach entire club fly Tell hobby shop owner want see toughest model aiplane money can buy LAIVI AFFORDABLE SPEED CONTROLS ala models speed controls fully proportional eIther dlreclloes Also Incoeporsled lallsaOe tImer whIch shuta down fIfe motor lIne eYed Irans mAter receIver receiver betlery faIlure Par AirplaneColepleleAssembled ModelsPerle KSadd Tented EKE24C$2150S2ao0 EKE24UWA$4150 EKEPB$4000$0000 Cars EKE7R$2500$3100 EKE7RM$2600$3200 EKE-PR$4050$5000 EKE-PB$4000$5050 RBV4$1095$1995 RBV-4 ON BOARD VOLTMETER assembled unlle carry s lull 90-day warreoly Please 5004 $200 pososge end hendllog per order Send SASE lnlormetloo Mall orders 10 ELDEN-KEN ELECTRONICS INC PO BOX 1853 Aroeds Coloredo 90001 cell today 1302 4311228 VIa d htaicd ocnpd plus 4% Control Line lers e ng Mote ~Fioishing FriendToolsAd ustab e Rudde No Contntl NornsCtnt o L ne 4 hIeevyOotBellcrenksNandles AdjuotobleLeadtultuidestlatoic Ails luslom Motor Motols ajlb much ouch Aluminum losertt INSAAPA55tD QuALITYIAAAANTtLO SATISFACTION Seod same address $100 receive new eopaoded calolotaod will tel $2 NA ott first order iYCroftaan Modets rIo 1311 16101 Woam Iia 46074 dualer inqairios toiled 0 OA- \~0~ore\ \ aruiBcures Display ACTION poSOted b CotrO 5 bAode nes oaS CatS pa ~roa6 oce'Cs t\CCessO ea SoeacW oa NEW THIS yEAR tions round Eights transitioning inside outside loops ship hinging will clearly see roll first top bottom wing becomes visible transition observations satisfy three criteria likely need lift tab wart Heres wart works Because three-ounce weight bal anced level flight weighs proportionately maneuver necessary develop propor tionately lift support Unfortunately basic unadorned outboard wing will increase lift exactly same rate inboard will itself able overcome creased load caused accelerated tip weight wart addition outboard flap sized trial error increase lift balance closely possible increased force caused maneuvering acceleration acting tip weight Because low angles flap deflection flapand therefore warthas negligible ef fect wart does nothing disrupt levelflight balance wings maneuvering however displacement flap/wart creases proportionately control-input de mand pilot harder turns ship the controls displaced effective becomes wart thus offsetting rolling tendency caused tip weight should mention wart flighttrimming accessory ordinarily part planes design criteria should noted however modern designers throw few tricks accomplish much same thing quite common designers advo cate equal-span flaps regardless wing asymmet ry also suggest wider chord outboard flapwhich course accomplishes much same effect wart may amused learn yours truly after adding warts several ships succession including 1982 Nats-winning Intimidation designed built Citation V wart trimmed off prior its 1986 Nats victory added back prior 1987 88 campaigns Flying may precise science trimming sucks obvious question course big should wart huh answer find out trial error best solution temporarily add adjustable tab balsa cardboard taped outboard flap far out possible gain maximum effect least area Ive found making about 3A x 3 good place start Careful observation flight tests will allow precise refinement its size until turning good flat corners hard wish last point tm hesitant speak about American Ares USA-I etc champions utilized significant wing asym metry eliminate need tip weight us modern designers trying ig nore obvious wisdom approach merely because inboard wings readily seen being longer arent aesthetically pleasing isnt us hasnt repeatedly decried addition useless dead weight designs merely give lip service search optimum performance eschew ing gains elimination un necessary burden Could have avoided en tire discussion warts merely throwing away last outboard rib ship Ive built since 1957 Sock Large James CL Speed/Hempel Continued page 81 job done bent shim stock should look like two sketches near pattern drawing Step Six Next cut strip shim stock will form outside wall tank Carefully measure height D cut stock must slightly less dimension put place inside solder tabs tank shell tank will have accurate rectangular cross section Note because wedge shape tank wall piece will somewhat longer E dimension used tank shell Note wall fits inside solder tabs tank shell E ry P C 6Do s what side wall tank looks like before bent fit inside tabs open side tank shell Note lengths B C must measured along outer edges shell will somewhat longer flat dimen sions shown pattern Table Step Seven Hold wall place surgical clamps small alligator clips Check make October 1989 181
Edition: Model Aviation - 1989/10
Page Numbers: 80, 180, 181
TELL what month lets talk about warts What Warts Ted says along thought Model Aviation official journal Academy Model Aeronautics Ameri can Medical Association What warts have Control Line Stunt Good question says However warts going discuss grow trailing edge outboard flaps some Stunt ships tired tootsies Warts small projec tions added outermost end outboard flaps successful Stunterssuch 1986 Nats-winning Citation V see photo Some unsophisticated modelers might refer control surface tab still wart define wart state-of-the-art aero dynamic refinement added otherwise sound design during flight testing cover up signifi cant design deficiency case deficien cy improper balance aircraft weight wing tip weight wing asymmetry Lets dis cuss First lets state what has noth ing counteracting warped wing misaligned flap etc Ringmaster sports similar wart purpose correcting twisted wing Such wart deflected act aileron level wings could term control tab since its purpose provide con tinuous control input counteract warped wing accomplish much same thing tweak flap flapped Stunter counteract warp call wart will discuss month tab name appropriate since its task provide additional lift outboard wing requiredspecifically ma neuvering As Ive discussed numerous times over years important trimming tasks encounter Stunt achieve wings-level attitude throughout flight level wemean wings constantly line control lines attitude achieved through balancing lift produced wing weight asked carry As long weight sup ported wing no less lift produced wings will remain line control lines smooth controllable maneu vering will result no tendency bank out circle primary means achieving balance through wing tip weight and/or wing asymmetry Because fly circle outboard wing al ways flying slightly faster inboard Since lift increases square velocity outboard wing will produce lift thus tend fly higher Either moving fuselage out board wing centerline resulting longer inboard wing what call asymmetry adding wing tip weight will counteract adContinued page 180 80 Model Aviation Control Line Aerobatics Ted Fancher 158 FlyIng Cloud Isle Foster City CA 94404 CL club Breitenbach W Germany owns its own flying fieldthe area between woods pathway Flying 60-fl lines puts plane just three feet off fence Ron Heisers Texas Twister modified Sig Twister inspired Teds Fancherized Twister August 1987 issue Plane fea tures Fox 35 equipped JTec No 404 muffler 4-oz Sullivan RST-4 clunk tank utilizes muffler pressure Wing cov ered heavy silkspan Sig Supercoat dope Ron says seems pretty fair effort 60-year-old line twister Tamas Tokal R second-best CIPA flier Hungary according West Ger manys Claus Maikis Planes finish could better good lacquer available Hun gary Claus says Tamas consistent flier Look tip end flap Fanchers plane 1 ugly growth trailing edge what Ted calls wartand month tells about such things necessary Derek Barrys Limitation R scaled-down 51 wingspan profile version Fanchers Imitation design Power appears OS 35/40 FP Dale Barry photo Dale Derek Barry part Atlanta Stunt Conspiracy gang hours good flying great sense selfsatisfaction Once again must credit thank Gerry Deneau Aurora CO lions share ideas thoughts presentation Sport Scale rules Sport Scale Scoresheet Committee has formed Response request help standardizing Sport Scale scoresheet competition rule book has good following will serve committee Gerry Deneau 6464 So Andes P1 Aurora CO 80016 Charles Bauer 4944 No Orange Aye Norride IL 60656 Mike Welshans 976 Pear son Ferndale MI 48220 William Rammage 411 North 5th Ave Tucson AZ 85705 writer address top column have ideas suggestions concerning Sport Scale scoresheets appeared July 89 column am sure abovenamed would glad hear Dont miss out opportunity heard Please send ideas contest reports especially photos CL Scale address found very top column CL Aerobatics/Fancher Continued page 80 ditional lift cause wings fly level early Stunters common cure con siderable amount wing asymmetry deBolt designed American Sr instance inboard wing nearly three inches longer outboard utilized no tip weight Ares Chief Nobler others vintage era inboard wings roughly two inches longer anywhere zero ounce wing tip weight lighter overall weight less lip weight would called ships wingspans roughly 50 very competitive time Modern Stunters much larger span aver aging 60 often have little no asymmetry Equal-span wings common designers advocate reasons germane current discussion com mon denominator equal- nearly span ships need significant amounts tip weight Three four ounces often necessary counteract additional lift faster flying equal-size outboard wing So far problem its solution seem sim ple outboard wing too large flies high because its excess lift simply load down tip weight until dont no mo lem solved yes Well actly Unfortunately three-ounce whatever tip weight weighs three ounces level flight Any time maneuver ship de velop significant acceleration G loads three-ounce mass proportionately multi plied Because wing tip weight concentrated mass high-density material located fafr lat eral distance models CG its effect greater mass inboard wing statically balances one-G level flight 15G hard corner becomes 45 ozand thats good news bad news apologies Paul Walker since 45 oz generated 30 outboard center-of-gravity gen erates rolling moment about CG result tendency bank away pilot during maneuvers Stunters call banking tendency hinging Hinging ob vious during hard corners such bottom right Triangle outboard wing might drop far visible pilot its major error expert pilot should recognize undesirable trim con dition might adversely affect score should able properly evaluate correct correctly diagnose hinging important observe three distinct symptoms First level flightboth upright invert edthe wings should absolutely level outboard wing up plane attitude down its opposite attitude have warp must corrected its up both waysor down both waystip weight should added subtracted appropriate step assures static balance tip weight lift correct level flight Second accurately possible must certained lead-outs correctly placed Improperly located lead-outs especially too far aft can also induce hinging good ballpark cri teria observe outboard wheel vis ible just slightly aft inboard calm air assuming landing gear accurately aligned start ordinary 35- 60-powered ship midpoint lead-outs falls within 1 1 aft CG mea sured wing tip can consider ade quate purpose Thirdand importantyou must consist ently observe bottom outboard wing visible inside maneuvers top visible outside maneuvers Perhaps obvious place observe intersec 180 Model Aviation SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane fl PRECISION UEEPRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 Duracraft Inc / 1007 Orchard Grove Drive Royal Oak MI 48067 DuraPlane IlThe trainer rugged enough teach entire club fly Tell hobby shop owner want see toughest model aiplane money can buy LAIVI AFFORDABLE SPEED CONTROLS ala models speed controls fully proportional eIther dlreclloes Also Incoeporsled lallsaOe tImer whIch shuta down fIfe motor lIne eYed Irans mAter receIver receiver betlery faIlure Par AirplaneColepleleAssembled ModelsPerle KSadd Tented EKE24C$2150S2ao0 EKE24UWA$4150 EKEPB$4000$0000 Cars EKE7R$2500$3100 EKE7RM$2600$3200 EKE-PR$4050$5000 EKE-PB$4000$5050 RBV4$1095$1995 RBV-4 ON BOARD VOLTMETER assembled unlle carry s lull 90-day warreoly Please 5004 $200 pososge end hendllog per order Send SASE lnlormetloo Mall orders 10 ELDEN-KEN ELECTRONICS INC PO BOX 1853 Aroeds Coloredo 90001 cell today 1302 4311228 VIa d htaicd ocnpd plus 4% Control Line lers e ng Mote ~Fioishing FriendToolsAd ustab e Rudde No Contntl NornsCtnt o L ne 4 hIeevyOotBellcrenksNandles AdjuotobleLeadtultuidestlatoic Ails luslom Motor Motols ajlb much ouch Aluminum losertt INSAAPA55tD QuALITYIAAAANTtLO SATISFACTION Seod same address $100 receive new eopaoded calolotaod will tel $2 NA ott first order iYCroftaan Modets rIo 1311 16101 Woam Iia 46074 dualer inqairios toiled 0 OA- \~0~ore\ \ aruiBcures Display ACTION poSOted b CotrO 5 bAode nes oaS CatS pa ~roa6 oce'Cs t\CCessO ea SoeacW oa NEW THIS yEAR tions round Eights transitioning inside outside loops ship hinging will clearly see roll first top bottom wing becomes visible transition observations satisfy three criteria likely need lift tab wart Heres wart works Because three-ounce weight bal anced level flight weighs proportionately maneuver necessary develop propor tionately lift support Unfortunately basic unadorned outboard wing will increase lift exactly same rate inboard will itself able overcome creased load caused accelerated tip weight wart addition outboard flap sized trial error increase lift balance closely possible increased force caused maneuvering acceleration acting tip weight Because low angles flap deflection flapand therefore warthas negligible ef fect wart does nothing disrupt levelflight balance wings maneuvering however displacement flap/wart creases proportionately control-input de mand pilot harder turns ship the controls displaced effective becomes wart thus offsetting rolling tendency caused tip weight should mention wart flighttrimming accessory ordinarily part planes design criteria should noted however modern designers throw few tricks accomplish much same thing quite common designers advo cate equal-span flaps regardless wing asymmet ry also suggest wider chord outboard flapwhich course accomplishes much same effect wart may amused learn yours truly after adding warts several ships succession including 1982 Nats-winning Intimidation designed built Citation V wart trimmed off prior its 1986 Nats victory added back prior 1987 88 campaigns Flying may precise science trimming sucks obvious question course big should wart huh answer find out trial error best solution temporarily add adjustable tab balsa cardboard taped outboard flap far out possible gain maximum effect least area Ive found making about 3A x 3 good place start Careful observation flight tests will allow precise refinement its size until turning good flat corners hard wish last point tm hesitant speak about American Ares USA-I etc champions utilized significant wing asym metry eliminate need tip weight us modern designers trying ig nore obvious wisdom approach merely because inboard wings readily seen being longer arent aesthetically pleasing isnt us hasnt repeatedly decried addition useless dead weight designs merely give lip service search optimum performance eschew ing gains elimination un necessary burden Could have avoided en tire discussion warts merely throwing away last outboard rib ship Ive built since 1957 Sock Large James CL Speed/Hempel Continued page 81 job done bent shim stock should look like two sketches near pattern drawing Step Six Next cut strip shim stock will form outside wall tank Carefully measure height D cut stock must slightly less dimension put place inside solder tabs tank shell tank will have accurate rectangular cross section Note because wedge shape tank wall piece will somewhat longer E dimension used tank shell Note wall fits inside solder tabs tank shell E ry P C 6Do s what side wall tank looks like before bent fit inside tabs open side tank shell Note lengths B C must measured along outer edges shell will somewhat longer flat dimen sions shown pattern Table Step Seven Hold wall place surgical clamps small alligator clips Check make October 1989 181
Edition: Model Aviation - 1989/10
Page Numbers: 80, 180, 181
TELL what month lets talk about warts What Warts Ted says along thought Model Aviation official journal Academy Model Aeronautics Ameri can Medical Association What warts have Control Line Stunt Good question says However warts going discuss grow trailing edge outboard flaps some Stunt ships tired tootsies Warts small projec tions added outermost end outboard flaps successful Stunterssuch 1986 Nats-winning Citation V see photo Some unsophisticated modelers might refer control surface tab still wart define wart state-of-the-art aero dynamic refinement added otherwise sound design during flight testing cover up signifi cant design deficiency case deficien cy improper balance aircraft weight wing tip weight wing asymmetry Lets dis cuss First lets state what has noth ing counteracting warped wing misaligned flap etc Ringmaster sports similar wart purpose correcting twisted wing Such wart deflected act aileron level wings could term control tab since its purpose provide con tinuous control input counteract warped wing accomplish much same thing tweak flap flapped Stunter counteract warp call wart will discuss month tab name appropriate since its task provide additional lift outboard wing requiredspecifically ma neuvering As Ive discussed numerous times over years important trimming tasks encounter Stunt achieve wings-level attitude throughout flight level wemean wings constantly line control lines attitude achieved through balancing lift produced wing weight asked carry As long weight sup ported wing no less lift produced wings will remain line control lines smooth controllable maneu vering will result no tendency bank out circle primary means achieving balance through wing tip weight and/or wing asymmetry Because fly circle outboard wing al ways flying slightly faster inboard Since lift increases square velocity outboard wing will produce lift thus tend fly higher Either moving fuselage out board wing centerline resulting longer inboard wing what call asymmetry adding wing tip weight will counteract adContinued page 180 80 Model Aviation Control Line Aerobatics Ted Fancher 158 FlyIng Cloud Isle Foster City CA 94404 CL club Breitenbach W Germany owns its own flying fieldthe area between woods pathway Flying 60-fl lines puts plane just three feet off fence Ron Heisers Texas Twister modified Sig Twister inspired Teds Fancherized Twister August 1987 issue Plane fea tures Fox 35 equipped JTec No 404 muffler 4-oz Sullivan RST-4 clunk tank utilizes muffler pressure Wing cov ered heavy silkspan Sig Supercoat dope Ron says seems pretty fair effort 60-year-old line twister Tamas Tokal R second-best CIPA flier Hungary according West Ger manys Claus Maikis Planes finish could better good lacquer available Hun gary Claus says Tamas consistent flier Look tip end flap Fanchers plane 1 ugly growth trailing edge what Ted calls wartand month tells about such things necessary Derek Barrys Limitation R scaled-down 51 wingspan profile version Fanchers Imitation design Power appears OS 35/40 FP Dale Barry photo Dale Derek Barry part Atlanta Stunt Conspiracy gang hours good flying great sense selfsatisfaction Once again must credit thank Gerry Deneau Aurora CO lions share ideas thoughts presentation Sport Scale rules Sport Scale Scoresheet Committee has formed Response request help standardizing Sport Scale scoresheet competition rule book has good following will serve committee Gerry Deneau 6464 So Andes P1 Aurora CO 80016 Charles Bauer 4944 No Orange Aye Norride IL 60656 Mike Welshans 976 Pear son Ferndale MI 48220 William Rammage 411 North 5th Ave Tucson AZ 85705 writer address top column have ideas suggestions concerning Sport Scale scoresheets appeared July 89 column am sure abovenamed would glad hear Dont miss out opportunity heard Please send ideas contest reports especially photos CL Scale address found very top column CL Aerobatics/Fancher Continued page 80 ditional lift cause wings fly level early Stunters common cure con siderable amount wing asymmetry deBolt designed American Sr instance inboard wing nearly three inches longer outboard utilized no tip weight Ares Chief Nobler others vintage era inboard wings roughly two inches longer anywhere zero ounce wing tip weight lighter overall weight less lip weight would called ships wingspans roughly 50 very competitive time Modern Stunters much larger span aver aging 60 often have little no asymmetry Equal-span wings common designers advocate reasons germane current discussion com mon denominator equal- nearly span ships need significant amounts tip weight Three four ounces often necessary counteract additional lift faster flying equal-size outboard wing So far problem its solution seem sim ple outboard wing too large flies high because its excess lift simply load down tip weight until dont no mo lem solved yes Well actly Unfortunately three-ounce whatever tip weight weighs three ounces level flight Any time maneuver ship de velop significant acceleration G loads three-ounce mass proportionately multi plied Because wing tip weight concentrated mass high-density material located fafr lat eral distance models CG its effect greater mass inboard wing statically balances one-G level flight 15G hard corner becomes 45 ozand thats good news bad news apologies Paul Walker since 45 oz generated 30 outboard center-of-gravity gen erates rolling moment about CG result tendency bank away pilot during maneuvers Stunters call banking tendency hinging Hinging ob vious during hard corners such bottom right Triangle outboard wing might drop far visible pilot its major error expert pilot should recognize undesirable trim con dition might adversely affect score should able properly evaluate correct correctly diagnose hinging important observe three distinct symptoms First level flightboth upright invert edthe wings should absolutely level outboard wing up plane attitude down its opposite attitude have warp must corrected its up both waysor down both waystip weight should added subtracted appropriate step assures static balance tip weight lift correct level flight Second accurately possible must certained lead-outs correctly placed Improperly located lead-outs especially too far aft can also induce hinging good ballpark cri teria observe outboard wheel vis ible just slightly aft inboard calm air assuming landing gear accurately aligned start ordinary 35- 60-powered ship midpoint lead-outs falls within 1 1 aft CG mea sured wing tip can consider ade quate purpose Thirdand importantyou must consist ently observe bottom outboard wing visible inside maneuvers top visible outside maneuvers Perhaps obvious place observe intersec 180 Model Aviation SUNBIRD SENSATION WITH STYLE Sunbird combines eye opening performance truly distinctive styling terrific flying design Whether choose 40 size Sunbird 10 Sunbird Jr youll find Sunbird perfect sport plane fl PRECISION UEEPRODUCTS INC 714 592-5144 510 E Arrow Highway San Dimas CA 91773 Duracraft Inc / 1007 Orchard Grove Drive Royal Oak MI 48067 DuraPlane IlThe trainer rugged enough teach entire club fly Tell hobby shop owner want see toughest model aiplane money can buy LAIVI AFFORDABLE SPEED CONTROLS ala models speed controls fully proportional eIther dlreclloes Also Incoeporsled lallsaOe tImer whIch shuta down fIfe motor lIne eYed Irans mAter receIver receiver betlery faIlure Par AirplaneColepleleAssembled ModelsPerle KSadd Tented EKE24C$2150S2ao0 EKE24UWA$4150 EKEPB$4000$0000 Cars EKE7R$2500$3100 EKE7RM$2600$3200 EKE-PR$4050$5000 EKE-PB$4000$5050 RBV4$1095$1995 RBV-4 ON BOARD VOLTMETER assembled unlle carry s lull 90-day warreoly Please 5004 $200 pososge end hendllog per order Send SASE lnlormetloo Mall orders 10 ELDEN-KEN ELECTRONICS INC PO BOX 1853 Aroeds Coloredo 90001 cell today 1302 4311228 VIa d htaicd ocnpd plus 4% Control Line lers e ng Mote ~Fioishing FriendToolsAd ustab e Rudde No Contntl NornsCtnt o L ne 4 hIeevyOotBellcrenksNandles AdjuotobleLeadtultuidestlatoic Ails luslom Motor Motols ajlb much ouch Aluminum losertt INSAAPA55tD QuALITYIAAAANTtLO SATISFACTION Seod same address $100 receive new eopaoded calolotaod will tel $2 NA ott first order iYCroftaan Modets rIo 1311 16101 Woam Iia 46074 dualer inqairios toiled 0 OA- \~0~ore\ \ aruiBcures Display ACTION poSOted b CotrO 5 bAode nes oaS CatS pa ~roa6 oce'Cs t\CCessO ea SoeacW oa NEW THIS yEAR tions round Eights transitioning inside outside loops ship hinging will clearly see roll first top bottom wing becomes visible transition observations satisfy three criteria likely need lift tab wart Heres wart works Because three-ounce weight bal anced level flight weighs proportionately maneuver necessary develop propor tionately lift support Unfortunately basic unadorned outboard wing will increase lift exactly same rate inboard will itself able overcome creased load caused accelerated tip weight wart addition outboard flap sized trial error increase lift balance closely possible increased force caused maneuvering acceleration acting tip weight Because low angles flap deflection flapand therefore warthas negligible ef fect wart does nothing disrupt levelflight balance wings maneuvering however displacement flap/wart creases proportionately control-input de mand pilot harder turns ship the controls displaced effective becomes wart thus offsetting rolling tendency caused tip weight should mention wart flighttrimming accessory ordinarily part planes design criteria should noted however modern designers throw few tricks accomplish much same thing quite common designers advo cate equal-span flaps regardless wing asymmet ry also suggest wider chord outboard flapwhich course accomplishes much same effect wart may amused learn yours truly after adding warts several ships succession including 1982 Nats-winning Intimidation designed built Citation V wart trimmed off prior its 1986 Nats victory added back prior 1987 88 campaigns Flying may precise science trimming sucks obvious question course big should wart huh answer find out trial error best solution temporarily add adjustable tab balsa cardboard taped outboard flap far out possible gain maximum effect least area Ive found making about 3A x 3 good place start Careful observation flight tests will allow precise refinement its size until turning good flat corners hard wish last point tm hesitant speak about American Ares USA-I etc champions utilized significant wing asym metry eliminate need tip weight us modern designers trying ig nore obvious wisdom approach merely because inboard wings readily seen being longer arent aesthetically pleasing isnt us hasnt repeatedly decried addition useless dead weight designs merely give lip service search optimum performance eschew ing gains elimination un necessary burden Could have avoided en tire discussion warts merely throwing away last outboard rib ship Ive built since 1957 Sock Large James CL Speed/Hempel Continued page 81 job done bent shim stock should look like two sketches near pattern drawing Step Six Next cut strip shim stock will form outside wall tank Carefully measure height D cut stock must slightly less dimension put place inside solder tabs tank shell tank will have accurate rectangular cross section Note because wedge shape tank wall piece will somewhat longer E dimension used tank shell Note wall fits inside solder tabs tank shell E ry P C 6Do s what side wall tank looks like before bent fit inside tabs open side tank shell Note lengths B C must measured along outer edges shell will somewhat longer flat dimen sions shown pattern Table Step Seven Hold wall place surgical clamps small alligator clips Check make October 1989 181