ARF STUNT Are ready ARF Stunt ready us What ARF just three questions will search swers months episode As Nobler Turns Yuuchh wrote drivel Couldnt have l whoever wrote it appropriate en tree months column Youll remember end last months effort mentioned new Cox Super Chipmunk almost-readyto-fly ARF questions al ready answered Control Line Stunt flier arrived doorstep sometime last summer accompanied letter Cox people concluded noting looking ward review Unfortunately other considerations such Nats new Stunter Ive trying fin ish kept jumping directly evalu ation until just recently Well now Ive built Ive flown surprisingly Ive got some opinions about Depending number gray hairs beard may remember earlier Cox Stunter ME-109 semiscale WW II fighter marketed mid-Seventies have very fond memories unofficial event 75 Nats Cox supplied fleet 109s offered official Nats contestant wished fly huge group pro-Stunters showed up participate what turned out first unofficial Nats /2A Stunt event aint seen nothing until youve watched 6-ft 7in Billy Simons flying 30-in-span Stunter poor engine nearly needed supercharging rarefied alr top wingover rate Coxs new Stunter chip off same block Eighties As can see pictures very attractive ship truly does assemble matter hour about nine major parts assemble majority building time spent ap plying self-adhesive red blue black de cals make ship really sparkle general engineering first-rate Cox double-ported 049 engine equipped plastic engine mount tightly clamped molded female receptors upper fuselage cowling Similar mounts support fully aer Adding 1/2 oz weight outboard wing tip changed Munk marginal per former pretty good Stunt trainer Cox has added integrai weight chamber iater production versions obatic wedge-style fuel tank fuselage lower cowling held together rubberbands feature allows front end ab sorb impacts breaking symmetrically airfoiled molded foam wing secured fuselage through molded plastic belly pan via two sheet metal screws rear third screw through positioning stan chion high point airfoil serves dual purpose mount bellcrank ward lip belly pan secured lower cowl front two-wheeled landing gear also snaps place juncture stabilizer molded directly fuse lage elevator rudder snap place easily Both can knocked off firm arrival simply snapped back place con ducted flight tests verify feature clear plastic canopy snaps place well cau tion about canopy use Sig Airplane Cleaner afterflight cleanup have never compat ibility problems finish material ever momentary contact spray Chipmunks canopy left milky stain dont know exact ingredients cleaner would recommend staying away sort solvent-type cleaner Chip generally pleased Chipmunks control system Unlike earlier plastic ready to-flys system sports full 3-in-diameter bellcrank has usablealthough fast response rate elevator pushrod connects bellcrank 05 pivot el evator horn 04 hinge line would have preferred equal arms both ends slow Continued pare 181 74 Model Aviation Control LLne Aerobatics Ted Fancher 158 Flng Cloud Ted reports Coxs nifty new Super Chipmunk ARF Stunter month Haif-A plane ca pable performing AMA CLPA pattern makes good Stunt trainer Two pros reaiiy gave works Coxs new plane Ted Fancher 1 five-times National Junior Senior Stunt Champion Dave Fitzgerald liked Test pilot Dave Fitzgerald checks centerof-gravityone critical beforefirst-flight checks Stunterof Super Chipmunk noted lead-out guide located farther aft ideal Cox has since corrected Computer-enhanced detail test planes lead-out guide shows about 40% chordtoo far aft clean square maneuvers Cox has changed its loca tion latest production models FF Old-Timers/Baker Continued page 176 big fin makes high power very tricky wants spiral dive flown hands-off same September column talked about importance having small fin area going fly Free Flight high power pleased get letter Bill McCombs senior engineer Vought Corporation agrees great book published Air Age Inc Model Airplane News some years ago entitled Flying Improving Scale Model Airplanes Find copy can Does anyone still have bunch sale includes much data FF performance stabil ity trim limited Scale models Bill later published Making Scale Models Fly mostly limited Scale principles apply flying thing think can buy later book directly him 2106 Siesta Dr Dallas TX 75224 last time saw Peck-Polymers catalog listed too can find copy earlier larger book think will agree worth hunt Bill says power climbing angle crease fin size can tolerated spiral flight developing smaller very large dihedral spiral flight can climb old enemy spiral dive lurks nearby very old antique Cabin models nce allowed cut off fin area increase dihedral d better fly Long Cabins Musketeers power levels designed handle next time Please keep letters photos coming Hansa No-CaI/Lidberg Continued page 69 Lay body down its left covered side glue motor stick making sure place stick wing must fit Add stabilizer wing havent already done make up tip tanks add jet engine Make lightening holes sheet balsa parts using piece sharpened brass tub ing eraser holder old wooden pencil cover parts glue place Attach ioop rubber check balance Add clay front body necessary obtain balance point shown plan Check plane over warps us ing dry heat electric stove burner space heater straighten out Try test glide making sure prop freewheels air Some adjustment add ing removing clay may necessary optimal glide Try some power flights Use about 100 turns making sure wind correct direction Power adjustments made largely using bendable thrust bear ing model stalls bend bit downthrust wont climb take out some downthrust add turns and/or take off some clay airplane seems happiest wide climb turn youre ready turn few heads flying field Hansa surefire way have some fun doing Lippisch/Mcllrath Continued page 72 another idea didnt pan out course such failures frustrations common research work some times disappointments can provide laughalthough humor situa tion might obvious time Such incident occurred building new tail duct replace dam aged flying model should light flies off workbench itself favorite Lippisch expression Saving weight always pri mary building goals particular morning doctor stopped workbench inspect nearly completed duct section picked up part weighed hand tossed down bench obvious dissatisfaction Too heavy announced Much too heavy its lots lighter old argued Twenty-three grams instead 31 Dr Lippisch sputtered moment stmggling find way explain such obvious principle poor slow-witted fellow Finally controlling himself ef fort quoted what might called Lip pischs First Law Aerodynamics feels too heavy too heavy marched out shop probably silently lamenting problem finding good model builders anymore As several stories have shown Dr Lippischs wit often mixed wisdom Sometimes after care ful reflection listener could tease out much playfulness much penetration words contained example friend once told discussion Dr Lippisch building pedal-powered plane jokingly called pedalfiugel un der consideration plane built like giant Indoor model using balsa much stmcture doctor describing amazing strength balsa tail boom section just tested Fifteen hundred pounds supported compression reported enthusiastically can keep compression interrupted another listener What some unexpected loads buckles tail collapses asked lis tener thinking course fate unfortunate individual manning ped als handlebars breaks fix answered doctorhis standard response whenever questioned strength unmanned models immediately resumed earlier dis cussion surprised hear doctor seemingly brush aside issue pilots safety safety people flying airplanes always Dr Lippischs pri mary concern proud fact never fatal accident during testing of civil designs wartime development fu turistic rocket-powered Me-163 ad hered cautious methods doctor followed earlier work Testing gan unpowered flights glider tiny interceptor towed aloft plane released high altitude Engineering measurements pilot familiarization exciting aerobatics safely per formed during long glides back earth Obviously pilots safety line breaks fix just wasnt like doctor ignoring danger accident pedalfiugel Looking back dont think Dr Lippisch years experi ence areas related man-powered air craft low-speed flight lightweight struc tures ground effect phenomena testing unorthodox machines Long before conversation understandably con cerned listener must have visualized actually calculated floating shoulderhigh flight giant Indoor model clearly sure serious injury highiy unlikely considered prob lem decided would problem erased mind Years later history Gossamer Condor Albatross projects confirmed principles extreme lightuess easy repairability two keys success human-powered flight As breaks fix dozens crashes Condor Albatross sur vived serious injury proved underneath its apparent casualness Dr Lip pischs maxim expressed sound engineer ing principle Dr Alexander Lippisch man ahead time ideas advanced spent whole adult life dragging much aeronautical world along behind him Trying convince doubting experts hed snort used term pleading businessmen research funds trying make rest us see future through eyes Sustaining kind effort year after year demands combination qualities few men possess Probably vivid sense humor traits made possible Doctor Lippischs brilliant leadership aeronautical science nearly 60 years CL Aerobatics/Fancher Continued page 74 response rate somewhat Nonetheless found ship could flown fairly comfort ably supplied Dacron lines handle later fly ship bellcrank itself mounted top wing control lines exit fuselage along top inboard wing similar cur rent Combat models clever two-piece lead out guide provided locate lead-outs January 1989 181 Stand Off Extra 230 Kits Scale Now Available Three Sizes 1/3 Scale Kit plus Sl5shipping 30% Scale Kit plus 515 shipping 1/4 Scale Kit ~ plus 510 shipping Also Available Weeks Special ~ plusSl5ship Cash VISA Certified Check R/C EXTRAS 712-943-4102 RR1 Box 288 Sergeant Bluff IA 51054 inboard tip Unfortunately guide ad justable self-adhesive decals worth moment time Decals will never adhere like good painted trim scheme However Chipmunks dont half bad would suggest skip white canopy outline since started peel after flight Also apply decals before assembly makes job much easier Press down firmly around molded plas tic details such panel lines rivets pre vent fuel seepage used fingernail nervous Stunt stars may have resort tool some kind Also note top bottom foam wing Yours truly particularly dun derheaded moment initially attached blue leading edge trim sheets bottom sur face remove BIUGOG mistake Once hits foam stickum will never restick aggressively finally seal edges some clear Fascal prevent lifting sure youve got decals prop erly located before pressing place foam isnt critical plastic piec es very pleased Chipmunk mechani cally exception slightly fast con trol hookup Frum design flight trim stand point few items concerned however surprised note although wings equal length no provision made wing tip weight basic trim feature Control Line airplane designed maneuver ing mind certain would serious deficiency tempted add some weight Outset decided against doing Perhaps come up different lution problem missing After completing assembly checked lo cation center-of-gravity after 30 years flying Stunt seems like second nature pick up Stunt ship first time wing tips proper location CG such integral part Stunt trim always first thing want learn about new ship worked Out excellent 145% mean aerodynamic chord MAC just about what would have ex pected unflapped design However location CG seemed just right what didnt like location lead-out guide fixed unadjustable loca tion full 1 aft CG air plane size weight airspeed would have expected no 1A 4 starting have some doubts about final flight trim Chipmunk delivered come ask Well us know line tension Control Line aint got nothin Whatever else optimize flight trim know maintaining line tension must paramount decisions classic solutions problem have always en gine offset lead-out sweep rudder offset Chipmunk has abundance However will bit good outboard wing flies consistently higher inboard does part lift vector will directed circle line tension will lost Since outboard wing always flies further inboard flies faster produces lift additional lift will make fly higher inboard unless utilize trim device counteract tendency Two solutions generally used tip weight and/or longer inboard wing equalize lift As previously noted Chipmunk has equal-length wings NO tip weight beginning wonder excessive lead-out sweep might attempt generate line tension lost through lack wing tip weight Only through actual flight tests would truth known morning test flights dawned Since total experienee limited about li/i flights some 15 years ago stock up some necessities werent supplied Chip included battery clips half-pint Cox fuel hobby shop David Fitzgerald five-time Junior Sen ior National Stunt Champion pilot ex traordinaire house way Mr Cox appalled $598 price tag half-pint fuel ratenearly $100 per gallonan ST 60 would burn about five bucks fuel flight Its hard believe little cans could justif price tag Initial test flights kind mixed bag engine started willingly fall day tended go rich quit going verted Several inverted landings made before ever got wheels dirty David sug gested possible loose glow head Sure enough after tightening head engine performed flawlessly rest day first flight using Cox-supplied Dacron lines handle immediately justified ear lier concern about line tension Although Chip responded aggressively line tension flight levels above about 450 almost nonexis tent outboard wing flew noticeably higher inboard both upright inverted clas sic symptom insufficient tip weight immediately began adding tip weight quarter-ounce increments using Prather stick-on trim weights settled total ottom right wing tip about line CG improvement performance immediate impressive Tension now adequate attitude sowith engine really hummingwe settled down some serious flying obvious increased line ten sion such short lines neither necessary nor desirable substituted set 008-in x 30-ft steel cables Sullivan Insta-Just #2 control handle 27-ft Dacron lines again no ticed substantial improvement Lap times comfortable tension still adequate would guess several feet line could added further trim adjustments lot finesse entire pattern could simulated Round maneuvers could performed very well squares approached caution turned too abruptly ship slows ex cessively time space eaten up accelerates feel moving lead-out guide forward will substantially improve ten dency since Chip will flying straight off lines rather cocked outward does now should reduce drag considerably Coxs Chipmunk dandy simple addition -oz tip weight great sport flier head shoulders above other plastic ARF serious tinkerer sub stantially performance available through judicious twealting fact Ive already redrilled new pushrod hole bellcrank 04 pivot Im repositioning lead-out guide about her forward Im tying new set 008in x 33-ft lines Give dozen flights Watch out Jimmy Casale Editors note couple weeks after colum nist Ted Fancher submitted manuscript spoke representative Cox Hobbies Ted sent letter Cox describing experience Super Chipmunk deficiencies 182 Model Aviation observed lack tip weight toorearward location lead-out guide Cox representative stated very pleased Teds efforts assured us Cox immediately making changes Su per Chipmnnk tooling improve model indicated Super Chipmunks improve ments incorporated would rolling off pro duction line about time issue Model Aviation reaches readers RMcM CL Scale/Boss Continued page 75 9 Union Avenue Little Ferry NJ 07643 has sev eral items readers column might terested knowing about first large plastic line reel has become hard-to-find item reel made high-visibility plastic easily lost misplaced molded right- left-hand operation reel has line storage area inch wide has diam eter about five inches comes equipped two line-clip holders reel priced $995 includes shipping An item could helpful fin ishing models 1200-grit sandpaper can used wet dry sald scratch 400/500/600-grit papers Windy also indicates has VHS videotapes modeling avallable particular interest Scale modeler footage 1988 CL World Championships Kiev USSR For catalog CL items handled Pro-Stunt write Windy address stated above Trophies something always con cerned planning next contest Oftentimes looking something unique different usual Victory figure-topped award need something really different might want look plaques ing offered Jennings Trophy Sales Hender sonville TN Jennings offering two series plaques 100 400 Series exactiy suited aeromodelers needs 100 Series features model engraving depicting various events RC CL FF 400 Series engraved two views usually front side alr planes such Beechcraft T-34C Grumman E2C Hawkeye etc Both series plaques also have engraving plates contest event information cost unique plaques right line cost awards given contests So youre looking something different write Jennings Trophy 13 Walton Mall PO Box 1121 Hendersonville TN 37077 Im sure will happy send catalog 1988 Directory CL Scale Items Model Aviation January History CL electronic control systems Mike Gretz Electric flap control Jerry Blaszczyk February Profile Scale activity update George Gaydos Workshop hint Bob Furr Prop balancing storage March Bonding adhesives Chris Shearer Hobbypoxy paint formulas Lemon Yellow Willow Green Kits plans sources Continued page 186 L KOVR-KUTR Covering material dispenser model KKA-030 assembled As seen Nov 88 issue RCM ALL 3034 65-5~ Office hours 830 am 430 pm MST CODs add $300 PIT-KIT Field box model PKK-01 0 kit model PKR-020 assembled As seen Jan 89 issue RCM FREE SHIPPING colorado model products Inc 555 Alter St PO Box 550 Broomfield CO 80020 Dept MA * 48 contiguous states January 1989 183 100/0 NSA t4 K1 $25 95 asse 49
Edition: Model Aviation - 1989/01
Page Numbers: 74, 181, 182, 183
Edition: Model Aviation - 1989/01
Page Numbers: 74, 181, 182, 183
ARF STUNT Are ready ARF Stunt ready us What ARF just three questions will search swers months episode As Nobler Turns Yuuchh wrote drivel Couldnt have l whoever wrote it appropriate en tree months column Youll remember end last months effort mentioned new Cox Super Chipmunk almost-readyto-fly ARF questions al ready answered Control Line Stunt flier arrived doorstep sometime last summer accompanied letter Cox people concluded noting looking ward review Unfortunately other considerations such Nats new Stunter Ive trying fin ish kept jumping directly evalu ation until just recently Well now Ive built Ive flown surprisingly Ive got some opinions about Depending number gray hairs beard may remember earlier Cox Stunter ME-109 semiscale WW II fighter marketed mid-Seventies have very fond memories unofficial event 75 Nats Cox supplied fleet 109s offered official Nats contestant wished fly huge group pro-Stunters showed up participate what turned out first unofficial Nats /2A Stunt event aint seen nothing until youve watched 6-ft 7in Billy Simons flying 30-in-span Stunter poor engine nearly needed supercharging rarefied alr top wingover rate Coxs new Stunter chip off same block Eighties As can see pictures very attractive ship truly does assemble matter hour about nine major parts assemble majority building time spent ap plying self-adhesive red blue black de cals make ship really sparkle general engineering first-rate Cox double-ported 049 engine equipped plastic engine mount tightly clamped molded female receptors upper fuselage cowling Similar mounts support fully aer Adding 1/2 oz weight outboard wing tip changed Munk marginal per former pretty good Stunt trainer Cox has added integrai weight chamber iater production versions obatic wedge-style fuel tank fuselage lower cowling held together rubberbands feature allows front end ab sorb impacts breaking symmetrically airfoiled molded foam wing secured fuselage through molded plastic belly pan via two sheet metal screws rear third screw through positioning stan chion high point airfoil serves dual purpose mount bellcrank ward lip belly pan secured lower cowl front two-wheeled landing gear also snaps place juncture stabilizer molded directly fuse lage elevator rudder snap place easily Both can knocked off firm arrival simply snapped back place con ducted flight tests verify feature clear plastic canopy snaps place well cau tion about canopy use Sig Airplane Cleaner afterflight cleanup have never compat ibility problems finish material ever momentary contact spray Chipmunks canopy left milky stain dont know exact ingredients cleaner would recommend staying away sort solvent-type cleaner Chip generally pleased Chipmunks control system Unlike earlier plastic ready to-flys system sports full 3-in-diameter bellcrank has usablealthough fast response rate elevator pushrod connects bellcrank 05 pivot el evator horn 04 hinge line would have preferred equal arms both ends slow Continued pare 181 74 Model Aviation Control LLne Aerobatics Ted Fancher 158 Flng Cloud Ted reports Coxs nifty new Super Chipmunk ARF Stunter month Haif-A plane ca pable performing AMA CLPA pattern makes good Stunt trainer Two pros reaiiy gave works Coxs new plane Ted Fancher 1 five-times National Junior Senior Stunt Champion Dave Fitzgerald liked Test pilot Dave Fitzgerald checks centerof-gravityone critical beforefirst-flight checks Stunterof Super Chipmunk noted lead-out guide located farther aft ideal Cox has since corrected Computer-enhanced detail test planes lead-out guide shows about 40% chordtoo far aft clean square maneuvers Cox has changed its loca tion latest production models FF Old-Timers/Baker Continued page 176 big fin makes high power very tricky wants spiral dive flown hands-off same September column talked about importance having small fin area going fly Free Flight high power pleased get letter Bill McCombs senior engineer Vought Corporation agrees great book published Air Age Inc Model Airplane News some years ago entitled Flying Improving Scale Model Airplanes Find copy can Does anyone still have bunch sale includes much data FF performance stabil ity trim limited Scale models Bill later published Making Scale Models Fly mostly limited Scale principles apply flying thing think can buy later book directly him 2106 Siesta Dr Dallas TX 75224 last time saw Peck-Polymers catalog listed too can find copy earlier larger book think will agree worth hunt Bill says power climbing angle crease fin size can tolerated spiral flight developing smaller very large dihedral spiral flight can climb old enemy spiral dive lurks nearby very old antique Cabin models nce allowed cut off fin area increase dihedral d better fly Long Cabins Musketeers power levels designed handle next time Please keep letters photos coming Hansa No-CaI/Lidberg Continued page 69 Lay body down its left covered side glue motor stick making sure place stick wing must fit Add stabilizer wing havent already done make up tip tanks add jet engine Make lightening holes sheet balsa parts using piece sharpened brass tub ing eraser holder old wooden pencil cover parts glue place Attach ioop rubber check balance Add clay front body necessary obtain balance point shown plan Check plane over warps us ing dry heat electric stove burner space heater straighten out Try test glide making sure prop freewheels air Some adjustment add ing removing clay may necessary optimal glide Try some power flights Use about 100 turns making sure wind correct direction Power adjustments made largely using bendable thrust bear ing model stalls bend bit downthrust wont climb take out some downthrust add turns and/or take off some clay airplane seems happiest wide climb turn youre ready turn few heads flying field Hansa surefire way have some fun doing Lippisch/Mcllrath Continued page 72 another idea didnt pan out course such failures frustrations common research work some times disappointments can provide laughalthough humor situa tion might obvious time Such incident occurred building new tail duct replace dam aged flying model should light flies off workbench itself favorite Lippisch expression Saving weight always pri mary building goals particular morning doctor stopped workbench inspect nearly completed duct section picked up part weighed hand tossed down bench obvious dissatisfaction Too heavy announced Much too heavy its lots lighter old argued Twenty-three grams instead 31 Dr Lippisch sputtered moment stmggling find way explain such obvious principle poor slow-witted fellow Finally controlling himself ef fort quoted what might called Lip pischs First Law Aerodynamics feels too heavy too heavy marched out shop probably silently lamenting problem finding good model builders anymore As several stories have shown Dr Lippischs wit often mixed wisdom Sometimes after care ful reflection listener could tease out much playfulness much penetration words contained example friend once told discussion Dr Lippisch building pedal-powered plane jokingly called pedalfiugel un der consideration plane built like giant Indoor model using balsa much stmcture doctor describing amazing strength balsa tail boom section just tested Fifteen hundred pounds supported compression reported enthusiastically can keep compression interrupted another listener What some unexpected loads buckles tail collapses asked lis tener thinking course fate unfortunate individual manning ped als handlebars breaks fix answered doctorhis standard response whenever questioned strength unmanned models immediately resumed earlier dis cussion surprised hear doctor seemingly brush aside issue pilots safety safety people flying airplanes always Dr Lippischs pri mary concern proud fact never fatal accident during testing of civil designs wartime development fu turistic rocket-powered Me-163 ad hered cautious methods doctor followed earlier work Testing gan unpowered flights glider tiny interceptor towed aloft plane released high altitude Engineering measurements pilot familiarization exciting aerobatics safely per formed during long glides back earth Obviously pilots safety line breaks fix just wasnt like doctor ignoring danger accident pedalfiugel Looking back dont think Dr Lippisch years experi ence areas related man-powered air craft low-speed flight lightweight struc tures ground effect phenomena testing unorthodox machines Long before conversation understandably con cerned listener must have visualized actually calculated floating shoulderhigh flight giant Indoor model clearly sure serious injury highiy unlikely considered prob lem decided would problem erased mind Years later history Gossamer Condor Albatross projects confirmed principles extreme lightuess easy repairability two keys success human-powered flight As breaks fix dozens crashes Condor Albatross sur vived serious injury proved underneath its apparent casualness Dr Lip pischs maxim expressed sound engineer ing principle Dr Alexander Lippisch man ahead time ideas advanced spent whole adult life dragging much aeronautical world along behind him Trying convince doubting experts hed snort used term pleading businessmen research funds trying make rest us see future through eyes Sustaining kind effort year after year demands combination qualities few men possess Probably vivid sense humor traits made possible Doctor Lippischs brilliant leadership aeronautical science nearly 60 years CL Aerobatics/Fancher Continued page 74 response rate somewhat Nonetheless found ship could flown fairly comfort ably supplied Dacron lines handle later fly ship bellcrank itself mounted top wing control lines exit fuselage along top inboard wing similar cur rent Combat models clever two-piece lead out guide provided locate lead-outs January 1989 181 Stand Off Extra 230 Kits Scale Now Available Three Sizes 1/3 Scale Kit plus Sl5shipping 30% Scale Kit plus 515 shipping 1/4 Scale Kit ~ plus 510 shipping Also Available Weeks Special ~ plusSl5ship Cash VISA Certified Check R/C EXTRAS 712-943-4102 RR1 Box 288 Sergeant Bluff IA 51054 inboard tip Unfortunately guide ad justable self-adhesive decals worth moment time Decals will never adhere like good painted trim scheme However Chipmunks dont half bad would suggest skip white canopy outline since started peel after flight Also apply decals before assembly makes job much easier Press down firmly around molded plas tic details such panel lines rivets pre vent fuel seepage used fingernail nervous Stunt stars may have resort tool some kind Also note top bottom foam wing Yours truly particularly dun derheaded moment initially attached blue leading edge trim sheets bottom sur face remove BIUGOG mistake Once hits foam stickum will never restick aggressively finally seal edges some clear Fascal prevent lifting sure youve got decals prop erly located before pressing place foam isnt critical plastic piec es very pleased Chipmunk mechani cally exception slightly fast con trol hookup Frum design flight trim stand point few items concerned however surprised note although wings equal length no provision made wing tip weight basic trim feature Control Line airplane designed maneuver ing mind certain would serious deficiency tempted add some weight Outset decided against doing Perhaps come up different lution problem missing After completing assembly checked lo cation center-of-gravity after 30 years flying Stunt seems like second nature pick up Stunt ship first time wing tips proper location CG such integral part Stunt trim always first thing want learn about new ship worked Out excellent 145% mean aerodynamic chord MAC just about what would have ex pected unflapped design However location CG seemed just right what didnt like location lead-out guide fixed unadjustable loca tion full 1 aft CG air plane size weight airspeed would have expected no 1A 4 starting have some doubts about final flight trim Chipmunk delivered come ask Well us know line tension Control Line aint got nothin Whatever else optimize flight trim know maintaining line tension must paramount decisions classic solutions problem have always en gine offset lead-out sweep rudder offset Chipmunk has abundance However will bit good outboard wing flies consistently higher inboard does part lift vector will directed circle line tension will lost Since outboard wing always flies further inboard flies faster produces lift additional lift will make fly higher inboard unless utilize trim device counteract tendency Two solutions generally used tip weight and/or longer inboard wing equalize lift As previously noted Chipmunk has equal-length wings NO tip weight beginning wonder excessive lead-out sweep might attempt generate line tension lost through lack wing tip weight Only through actual flight tests would truth known morning test flights dawned Since total experienee limited about li/i flights some 15 years ago stock up some necessities werent supplied Chip included battery clips half-pint Cox fuel hobby shop David Fitzgerald five-time Junior Sen ior National Stunt Champion pilot ex traordinaire house way Mr Cox appalled $598 price tag half-pint fuel ratenearly $100 per gallonan ST 60 would burn about five bucks fuel flight Its hard believe little cans could justif price tag Initial test flights kind mixed bag engine started willingly fall day tended go rich quit going verted Several inverted landings made before ever got wheels dirty David sug gested possible loose glow head Sure enough after tightening head engine performed flawlessly rest day first flight using Cox-supplied Dacron lines handle immediately justified ear lier concern about line tension Although Chip responded aggressively line tension flight levels above about 450 almost nonexis tent outboard wing flew noticeably higher inboard both upright inverted clas sic symptom insufficient tip weight immediately began adding tip weight quarter-ounce increments using Prather stick-on trim weights settled total ottom right wing tip about line CG improvement performance immediate impressive Tension now adequate attitude sowith engine really hummingwe settled down some serious flying obvious increased line ten sion such short lines neither necessary nor desirable substituted set 008-in x 30-ft steel cables Sullivan Insta-Just #2 control handle 27-ft Dacron lines again no ticed substantial improvement Lap times comfortable tension still adequate would guess several feet line could added further trim adjustments lot finesse entire pattern could simulated Round maneuvers could performed very well squares approached caution turned too abruptly ship slows ex cessively time space eaten up accelerates feel moving lead-out guide forward will substantially improve ten dency since Chip will flying straight off lines rather cocked outward does now should reduce drag considerably Coxs Chipmunk dandy simple addition -oz tip weight great sport flier head shoulders above other plastic ARF serious tinkerer sub stantially performance available through judicious twealting fact Ive already redrilled new pushrod hole bellcrank 04 pivot Im repositioning lead-out guide about her forward Im tying new set 008in x 33-ft lines Give dozen flights Watch out Jimmy Casale Editors note couple weeks after colum nist Ted Fancher submitted manuscript spoke representative Cox Hobbies Ted sent letter Cox describing experience Super Chipmunk deficiencies 182 Model Aviation observed lack tip weight toorearward location lead-out guide Cox representative stated very pleased Teds efforts assured us Cox immediately making changes Su per Chipmnnk tooling improve model indicated Super Chipmunks improve ments incorporated would rolling off pro duction line about time issue Model Aviation reaches readers RMcM CL Scale/Boss Continued page 75 9 Union Avenue Little Ferry NJ 07643 has sev eral items readers column might terested knowing about first large plastic line reel has become hard-to-find item reel made high-visibility plastic easily lost misplaced molded right- left-hand operation reel has line storage area inch wide has diam eter about five inches comes equipped two line-clip holders reel priced $995 includes shipping An item could helpful fin ishing models 1200-grit sandpaper can used wet dry sald scratch 400/500/600-grit papers Windy also indicates has VHS videotapes modeling avallable particular interest Scale modeler footage 1988 CL World Championships Kiev USSR For catalog CL items handled Pro-Stunt write Windy address stated above Trophies something always con cerned planning next contest Oftentimes looking something unique different usual Victory figure-topped award need something really different might want look plaques ing offered Jennings Trophy Sales Hender sonville TN Jennings offering two series plaques 100 400 Series exactiy suited aeromodelers needs 100 Series features model engraving depicting various events RC CL FF 400 Series engraved two views usually front side alr planes such Beechcraft T-34C Grumman E2C Hawkeye etc Both series plaques also have engraving plates contest event information cost unique plaques right line cost awards given contests So youre looking something different write Jennings Trophy 13 Walton Mall PO Box 1121 Hendersonville TN 37077 Im sure will happy send catalog 1988 Directory CL Scale Items Model Aviation January History CL electronic control systems Mike Gretz Electric flap control Jerry Blaszczyk February Profile Scale activity update George Gaydos Workshop hint Bob Furr Prop balancing storage March Bonding adhesives Chris Shearer Hobbypoxy paint formulas Lemon Yellow Willow Green Kits plans sources Continued page 186 L KOVR-KUTR Covering material dispenser model KKA-030 assembled As seen Nov 88 issue RCM ALL 3034 65-5~ Office hours 830 am 430 pm MST CODs add $300 PIT-KIT Field box model PKK-01 0 kit model PKR-020 assembled As seen Jan 89 issue RCM FREE SHIPPING colorado model products Inc 555 Alter St PO Box 550 Broomfield CO 80020 Dept MA * 48 contiguous states January 1989 183 100/0 NSA t4 K1 $25 95 asse 49
Edition: Model Aviation - 1989/01
Page Numbers: 74, 181, 182, 183
ARF STUNT Are ready ARF Stunt ready us What ARF just three questions will search swers months episode As Nobler Turns Yuuchh wrote drivel Couldnt have l whoever wrote it appropriate en tree months column Youll remember end last months effort mentioned new Cox Super Chipmunk almost-readyto-fly ARF questions al ready answered Control Line Stunt flier arrived doorstep sometime last summer accompanied letter Cox people concluded noting looking ward review Unfortunately other considerations such Nats new Stunter Ive trying fin ish kept jumping directly evalu ation until just recently Well now Ive built Ive flown surprisingly Ive got some opinions about Depending number gray hairs beard may remember earlier Cox Stunter ME-109 semiscale WW II fighter marketed mid-Seventies have very fond memories unofficial event 75 Nats Cox supplied fleet 109s offered official Nats contestant wished fly huge group pro-Stunters showed up participate what turned out first unofficial Nats /2A Stunt event aint seen nothing until youve watched 6-ft 7in Billy Simons flying 30-in-span Stunter poor engine nearly needed supercharging rarefied alr top wingover rate Coxs new Stunter chip off same block Eighties As can see pictures very attractive ship truly does assemble matter hour about nine major parts assemble majority building time spent ap plying self-adhesive red blue black de cals make ship really sparkle general engineering first-rate Cox double-ported 049 engine equipped plastic engine mount tightly clamped molded female receptors upper fuselage cowling Similar mounts support fully aer Adding 1/2 oz weight outboard wing tip changed Munk marginal per former pretty good Stunt trainer Cox has added integrai weight chamber iater production versions obatic wedge-style fuel tank fuselage lower cowling held together rubberbands feature allows front end ab sorb impacts breaking symmetrically airfoiled molded foam wing secured fuselage through molded plastic belly pan via two sheet metal screws rear third screw through positioning stan chion high point airfoil serves dual purpose mount bellcrank ward lip belly pan secured lower cowl front two-wheeled landing gear also snaps place juncture stabilizer molded directly fuse lage elevator rudder snap place easily Both can knocked off firm arrival simply snapped back place con ducted flight tests verify feature clear plastic canopy snaps place well cau tion about canopy use Sig Airplane Cleaner afterflight cleanup have never compat ibility problems finish material ever momentary contact spray Chipmunks canopy left milky stain dont know exact ingredients cleaner would recommend staying away sort solvent-type cleaner Chip generally pleased Chipmunks control system Unlike earlier plastic ready to-flys system sports full 3-in-diameter bellcrank has usablealthough fast response rate elevator pushrod connects bellcrank 05 pivot el evator horn 04 hinge line would have preferred equal arms both ends slow Continued pare 181 74 Model Aviation Control LLne Aerobatics Ted Fancher 158 Flng Cloud Ted reports Coxs nifty new Super Chipmunk ARF Stunter month Haif-A plane ca pable performing AMA CLPA pattern makes good Stunt trainer Two pros reaiiy gave works Coxs new plane Ted Fancher 1 five-times National Junior Senior Stunt Champion Dave Fitzgerald liked Test pilot Dave Fitzgerald checks centerof-gravityone critical beforefirst-flight checks Stunterof Super Chipmunk noted lead-out guide located farther aft ideal Cox has since corrected Computer-enhanced detail test planes lead-out guide shows about 40% chordtoo far aft clean square maneuvers Cox has changed its loca tion latest production models FF Old-Timers/Baker Continued page 176 big fin makes high power very tricky wants spiral dive flown hands-off same September column talked about importance having small fin area going fly Free Flight high power pleased get letter Bill McCombs senior engineer Vought Corporation agrees great book published Air Age Inc Model Airplane News some years ago entitled Flying Improving Scale Model Airplanes Find copy can Does anyone still have bunch sale includes much data FF performance stabil ity trim limited Scale models Bill later published Making Scale Models Fly mostly limited Scale principles apply flying thing think can buy later book directly him 2106 Siesta Dr Dallas TX 75224 last time saw Peck-Polymers catalog listed too can find copy earlier larger book think will agree worth hunt Bill says power climbing angle crease fin size can tolerated spiral flight developing smaller very large dihedral spiral flight can climb old enemy spiral dive lurks nearby very old antique Cabin models nce allowed cut off fin area increase dihedral d better fly Long Cabins Musketeers power levels designed handle next time Please keep letters photos coming Hansa No-CaI/Lidberg Continued page 69 Lay body down its left covered side glue motor stick making sure place stick wing must fit Add stabilizer wing havent already done make up tip tanks add jet engine Make lightening holes sheet balsa parts using piece sharpened brass tub ing eraser holder old wooden pencil cover parts glue place Attach ioop rubber check balance Add clay front body necessary obtain balance point shown plan Check plane over warps us ing dry heat electric stove burner space heater straighten out Try test glide making sure prop freewheels air Some adjustment add ing removing clay may necessary optimal glide Try some power flights Use about 100 turns making sure wind correct direction Power adjustments made largely using bendable thrust bear ing model stalls bend bit downthrust wont climb take out some downthrust add turns and/or take off some clay airplane seems happiest wide climb turn youre ready turn few heads flying field Hansa surefire way have some fun doing Lippisch/Mcllrath Continued page 72 another idea didnt pan out course such failures frustrations common research work some times disappointments can provide laughalthough humor situa tion might obvious time Such incident occurred building new tail duct replace dam aged flying model should light flies off workbench itself favorite Lippisch expression Saving weight always pri mary building goals particular morning doctor stopped workbench inspect nearly completed duct section picked up part weighed hand tossed down bench obvious dissatisfaction Too heavy announced Much too heavy its lots lighter old argued Twenty-three grams instead 31 Dr Lippisch sputtered moment stmggling find way explain such obvious principle poor slow-witted fellow Finally controlling himself ef fort quoted what might called Lip pischs First Law Aerodynamics feels too heavy too heavy marched out shop probably silently lamenting problem finding good model builders anymore As several stories have shown Dr Lippischs wit often mixed wisdom Sometimes after care ful reflection listener could tease out much playfulness much penetration words contained example friend once told discussion Dr Lippisch building pedal-powered plane jokingly called pedalfiugel un der consideration plane built like giant Indoor model using balsa much stmcture doctor describing amazing strength balsa tail boom section just tested Fifteen hundred pounds supported compression reported enthusiastically can keep compression interrupted another listener What some unexpected loads buckles tail collapses asked lis tener thinking course fate unfortunate individual manning ped als handlebars breaks fix answered doctorhis standard response whenever questioned strength unmanned models immediately resumed earlier dis cussion surprised hear doctor seemingly brush aside issue pilots safety safety people flying airplanes always Dr Lippischs pri mary concern proud fact never fatal accident during testing of civil designs wartime development fu turistic rocket-powered Me-163 ad hered cautious methods doctor followed earlier work Testing gan unpowered flights glider tiny interceptor towed aloft plane released high altitude Engineering measurements pilot familiarization exciting aerobatics safely per formed during long glides back earth Obviously pilots safety line breaks fix just wasnt like doctor ignoring danger accident pedalfiugel Looking back dont think Dr Lippisch years experi ence areas related man-powered air craft low-speed flight lightweight struc tures ground effect phenomena testing unorthodox machines Long before conversation understandably con cerned listener must have visualized actually calculated floating shoulderhigh flight giant Indoor model clearly sure serious injury highiy unlikely considered prob lem decided would problem erased mind Years later history Gossamer Condor Albatross projects confirmed principles extreme lightuess easy repairability two keys success human-powered flight As breaks fix dozens crashes Condor Albatross sur vived serious injury proved underneath its apparent casualness Dr Lip pischs maxim expressed sound engineer ing principle Dr Alexander Lippisch man ahead time ideas advanced spent whole adult life dragging much aeronautical world along behind him Trying convince doubting experts hed snort used term pleading businessmen research funds trying make rest us see future through eyes Sustaining kind effort year after year demands combination qualities few men possess Probably vivid sense humor traits made possible Doctor Lippischs brilliant leadership aeronautical science nearly 60 years CL Aerobatics/Fancher Continued page 74 response rate somewhat Nonetheless found ship could flown fairly comfort ably supplied Dacron lines handle later fly ship bellcrank itself mounted top wing control lines exit fuselage along top inboard wing similar cur rent Combat models clever two-piece lead out guide provided locate lead-outs January 1989 181 Stand Off Extra 230 Kits Scale Now Available Three Sizes 1/3 Scale Kit plus Sl5shipping 30% Scale Kit plus 515 shipping 1/4 Scale Kit ~ plus 510 shipping Also Available Weeks Special ~ plusSl5ship Cash VISA Certified Check R/C EXTRAS 712-943-4102 RR1 Box 288 Sergeant Bluff IA 51054 inboard tip Unfortunately guide ad justable self-adhesive decals worth moment time Decals will never adhere like good painted trim scheme However Chipmunks dont half bad would suggest skip white canopy outline since started peel after flight Also apply decals before assembly makes job much easier Press down firmly around molded plas tic details such panel lines rivets pre vent fuel seepage used fingernail nervous Stunt stars may have resort tool some kind Also note top bottom foam wing Yours truly particularly dun derheaded moment initially attached blue leading edge trim sheets bottom sur face remove BIUGOG mistake Once hits foam stickum will never restick aggressively finally seal edges some clear Fascal prevent lifting sure youve got decals prop erly located before pressing place foam isnt critical plastic piec es very pleased Chipmunk mechani cally exception slightly fast con trol hookup Frum design flight trim stand point few items concerned however surprised note although wings equal length no provision made wing tip weight basic trim feature Control Line airplane designed maneuver ing mind certain would serious deficiency tempted add some weight Outset decided against doing Perhaps come up different lution problem missing After completing assembly checked lo cation center-of-gravity after 30 years flying Stunt seems like second nature pick up Stunt ship first time wing tips proper location CG such integral part Stunt trim always first thing want learn about new ship worked Out excellent 145% mean aerodynamic chord MAC just about what would have ex pected unflapped design However location CG seemed just right what didnt like location lead-out guide fixed unadjustable loca tion full 1 aft CG air plane size weight airspeed would have expected no 1A 4 starting have some doubts about final flight trim Chipmunk delivered come ask Well us know line tension Control Line aint got nothin Whatever else optimize flight trim know maintaining line tension must paramount decisions classic solutions problem have always en gine offset lead-out sweep rudder offset Chipmunk has abundance However will bit good outboard wing flies consistently higher inboard does part lift vector will directed circle line tension will lost Since outboard wing always flies further inboard flies faster produces lift additional lift will make fly higher inboard unless utilize trim device counteract tendency Two solutions generally used tip weight and/or longer inboard wing equalize lift As previously noted Chipmunk has equal-length wings NO tip weight beginning wonder excessive lead-out sweep might attempt generate line tension lost through lack wing tip weight Only through actual flight tests would truth known morning test flights dawned Since total experienee limited about li/i flights some 15 years ago stock up some necessities werent supplied Chip included battery clips half-pint Cox fuel hobby shop David Fitzgerald five-time Junior Sen ior National Stunt Champion pilot ex traordinaire house way Mr Cox appalled $598 price tag half-pint fuel ratenearly $100 per gallonan ST 60 would burn about five bucks fuel flight Its hard believe little cans could justif price tag Initial test flights kind mixed bag engine started willingly fall day tended go rich quit going verted Several inverted landings made before ever got wheels dirty David sug gested possible loose glow head Sure enough after tightening head engine performed flawlessly rest day first flight using Cox-supplied Dacron lines handle immediately justified ear lier concern about line tension Although Chip responded aggressively line tension flight levels above about 450 almost nonexis tent outboard wing flew noticeably higher inboard both upright inverted clas sic symptom insufficient tip weight immediately began adding tip weight quarter-ounce increments using Prather stick-on trim weights settled total ottom right wing tip about line CG improvement performance immediate impressive Tension now adequate attitude sowith engine really hummingwe settled down some serious flying obvious increased line ten sion such short lines neither necessary nor desirable substituted set 008-in x 30-ft steel cables Sullivan Insta-Just #2 control handle 27-ft Dacron lines again no ticed substantial improvement Lap times comfortable tension still adequate would guess several feet line could added further trim adjustments lot finesse entire pattern could simulated Round maneuvers could performed very well squares approached caution turned too abruptly ship slows ex cessively time space eaten up accelerates feel moving lead-out guide forward will substantially improve ten dency since Chip will flying straight off lines rather cocked outward does now should reduce drag considerably Coxs Chipmunk dandy simple addition -oz tip weight great sport flier head shoulders above other plastic ARF serious tinkerer sub stantially performance available through judicious twealting fact Ive already redrilled new pushrod hole bellcrank 04 pivot Im repositioning lead-out guide about her forward Im tying new set 008in x 33-ft lines Give dozen flights Watch out Jimmy Casale Editors note couple weeks after colum nist Ted Fancher submitted manuscript spoke representative Cox Hobbies Ted sent letter Cox describing experience Super Chipmunk deficiencies 182 Model Aviation observed lack tip weight toorearward location lead-out guide Cox representative stated very pleased Teds efforts assured us Cox immediately making changes Su per Chipmnnk tooling improve model indicated Super Chipmunks improve ments incorporated would rolling off pro duction line about time issue Model Aviation reaches readers RMcM CL Scale/Boss Continued page 75 9 Union Avenue Little Ferry NJ 07643 has sev eral items readers column might terested knowing about first large plastic line reel has become hard-to-find item reel made high-visibility plastic easily lost misplaced molded right- left-hand operation reel has line storage area inch wide has diam eter about five inches comes equipped two line-clip holders reel priced $995 includes shipping An item could helpful fin ishing models 1200-grit sandpaper can used wet dry sald scratch 400/500/600-grit papers Windy also indicates has VHS videotapes modeling avallable particular interest Scale modeler footage 1988 CL World Championships Kiev USSR For catalog CL items handled Pro-Stunt write Windy address stated above Trophies something always con cerned planning next contest Oftentimes looking something unique different usual Victory figure-topped award need something really different might want look plaques ing offered Jennings Trophy Sales Hender sonville TN Jennings offering two series plaques 100 400 Series exactiy suited aeromodelers needs 100 Series features model engraving depicting various events RC CL FF 400 Series engraved two views usually front side alr planes such Beechcraft T-34C Grumman E2C Hawkeye etc Both series plaques also have engraving plates contest event information cost unique plaques right line cost awards given contests So youre looking something different write Jennings Trophy 13 Walton Mall PO Box 1121 Hendersonville TN 37077 Im sure will happy send catalog 1988 Directory CL Scale Items Model Aviation January History CL electronic control systems Mike Gretz Electric flap control Jerry Blaszczyk February Profile Scale activity update George Gaydos Workshop hint Bob Furr Prop balancing storage March Bonding adhesives Chris Shearer Hobbypoxy paint formulas Lemon Yellow Willow Green Kits plans sources Continued page 186 L KOVR-KUTR Covering material dispenser model KKA-030 assembled As seen Nov 88 issue RCM ALL 3034 65-5~ Office hours 830 am 430 pm MST CODs add $300 PIT-KIT Field box model PKK-01 0 kit model PKR-020 assembled As seen Jan 89 issue RCM FREE SHIPPING colorado model products Inc 555 Alter St PO Box 550 Broomfield CO 80020 Dept MA * 48 contiguous states January 1989 183 100/0 NSA t4 K1 $25 95 asse 49
Edition: Model Aviation - 1989/01
Page Numbers: 74, 181, 182, 183
ARF STUNT Are ready ARF Stunt ready us What ARF just three questions will search swers months episode As Nobler Turns Yuuchh wrote drivel Couldnt have l whoever wrote it appropriate en tree months column Youll remember end last months effort mentioned new Cox Super Chipmunk almost-readyto-fly ARF questions al ready answered Control Line Stunt flier arrived doorstep sometime last summer accompanied letter Cox people concluded noting looking ward review Unfortunately other considerations such Nats new Stunter Ive trying fin ish kept jumping directly evalu ation until just recently Well now Ive built Ive flown surprisingly Ive got some opinions about Depending number gray hairs beard may remember earlier Cox Stunter ME-109 semiscale WW II fighter marketed mid-Seventies have very fond memories unofficial event 75 Nats Cox supplied fleet 109s offered official Nats contestant wished fly huge group pro-Stunters showed up participate what turned out first unofficial Nats /2A Stunt event aint seen nothing until youve watched 6-ft 7in Billy Simons flying 30-in-span Stunter poor engine nearly needed supercharging rarefied alr top wingover rate Coxs new Stunter chip off same block Eighties As can see pictures very attractive ship truly does assemble matter hour about nine major parts assemble majority building time spent ap plying self-adhesive red blue black de cals make ship really sparkle general engineering first-rate Cox double-ported 049 engine equipped plastic engine mount tightly clamped molded female receptors upper fuselage cowling Similar mounts support fully aer Adding 1/2 oz weight outboard wing tip changed Munk marginal per former pretty good Stunt trainer Cox has added integrai weight chamber iater production versions obatic wedge-style fuel tank fuselage lower cowling held together rubberbands feature allows front end ab sorb impacts breaking symmetrically airfoiled molded foam wing secured fuselage through molded plastic belly pan via two sheet metal screws rear third screw through positioning stan chion high point airfoil serves dual purpose mount bellcrank ward lip belly pan secured lower cowl front two-wheeled landing gear also snaps place juncture stabilizer molded directly fuse lage elevator rudder snap place easily Both can knocked off firm arrival simply snapped back place con ducted flight tests verify feature clear plastic canopy snaps place well cau tion about canopy use Sig Airplane Cleaner afterflight cleanup have never compat ibility problems finish material ever momentary contact spray Chipmunks canopy left milky stain dont know exact ingredients cleaner would recommend staying away sort solvent-type cleaner Chip generally pleased Chipmunks control system Unlike earlier plastic ready to-flys system sports full 3-in-diameter bellcrank has usablealthough fast response rate elevator pushrod connects bellcrank 05 pivot el evator horn 04 hinge line would have preferred equal arms both ends slow Continued pare 181 74 Model Aviation Control LLne Aerobatics Ted Fancher 158 Flng Cloud Ted reports Coxs nifty new Super Chipmunk ARF Stunter month Haif-A plane ca pable performing AMA CLPA pattern makes good Stunt trainer Two pros reaiiy gave works Coxs new plane Ted Fancher 1 five-times National Junior Senior Stunt Champion Dave Fitzgerald liked Test pilot Dave Fitzgerald checks centerof-gravityone critical beforefirst-flight checks Stunterof Super Chipmunk noted lead-out guide located farther aft ideal Cox has since corrected Computer-enhanced detail test planes lead-out guide shows about 40% chordtoo far aft clean square maneuvers Cox has changed its loca tion latest production models FF Old-Timers/Baker Continued page 176 big fin makes high power very tricky wants spiral dive flown hands-off same September column talked about importance having small fin area going fly Free Flight high power pleased get letter Bill McCombs senior engineer Vought Corporation agrees great book published Air Age Inc Model Airplane News some years ago entitled Flying Improving Scale Model Airplanes Find copy can Does anyone still have bunch sale includes much data FF performance stabil ity trim limited Scale models Bill later published Making Scale Models Fly mostly limited Scale principles apply flying thing think can buy later book directly him 2106 Siesta Dr Dallas TX 75224 last time saw Peck-Polymers catalog listed too can find copy earlier larger book think will agree worth hunt Bill says power climbing angle crease fin size can tolerated spiral flight developing smaller very large dihedral spiral flight can climb old enemy spiral dive lurks nearby very old antique Cabin models nce allowed cut off fin area increase dihedral d better fly Long Cabins Musketeers power levels designed handle next time Please keep letters photos coming Hansa No-CaI/Lidberg Continued page 69 Lay body down its left covered side glue motor stick making sure place stick wing must fit Add stabilizer wing havent already done make up tip tanks add jet engine Make lightening holes sheet balsa parts using piece sharpened brass tub ing eraser holder old wooden pencil cover parts glue place Attach ioop rubber check balance Add clay front body necessary obtain balance point shown plan Check plane over warps us ing dry heat electric stove burner space heater straighten out Try test glide making sure prop freewheels air Some adjustment add ing removing clay may necessary optimal glide Try some power flights Use about 100 turns making sure wind correct direction Power adjustments made largely using bendable thrust bear ing model stalls bend bit downthrust wont climb take out some downthrust add turns and/or take off some clay airplane seems happiest wide climb turn youre ready turn few heads flying field Hansa surefire way have some fun doing Lippisch/Mcllrath Continued page 72 another idea didnt pan out course such failures frustrations common research work some times disappointments can provide laughalthough humor situa tion might obvious time Such incident occurred building new tail duct replace dam aged flying model should light flies off workbench itself favorite Lippisch expression Saving weight always pri mary building goals particular morning doctor stopped workbench inspect nearly completed duct section picked up part weighed hand tossed down bench obvious dissatisfaction Too heavy announced Much too heavy its lots lighter old argued Twenty-three grams instead 31 Dr Lippisch sputtered moment stmggling find way explain such obvious principle poor slow-witted fellow Finally controlling himself ef fort quoted what might called Lip pischs First Law Aerodynamics feels too heavy too heavy marched out shop probably silently lamenting problem finding good model builders anymore As several stories have shown Dr Lippischs wit often mixed wisdom Sometimes after care ful reflection listener could tease out much playfulness much penetration words contained example friend once told discussion Dr Lippisch building pedal-powered plane jokingly called pedalfiugel un der consideration plane built like giant Indoor model using balsa much stmcture doctor describing amazing strength balsa tail boom section just tested Fifteen hundred pounds supported compression reported enthusiastically can keep compression interrupted another listener What some unexpected loads buckles tail collapses asked lis tener thinking course fate unfortunate individual manning ped als handlebars breaks fix answered doctorhis standard response whenever questioned strength unmanned models immediately resumed earlier dis cussion surprised hear doctor seemingly brush aside issue pilots safety safety people flying airplanes always Dr Lippischs pri mary concern proud fact never fatal accident during testing of civil designs wartime development fu turistic rocket-powered Me-163 ad hered cautious methods doctor followed earlier work Testing gan unpowered flights glider tiny interceptor towed aloft plane released high altitude Engineering measurements pilot familiarization exciting aerobatics safely per formed during long glides back earth Obviously pilots safety line breaks fix just wasnt like doctor ignoring danger accident pedalfiugel Looking back dont think Dr Lippisch years experi ence areas related man-powered air craft low-speed flight lightweight struc tures ground effect phenomena testing unorthodox machines Long before conversation understandably con cerned listener must have visualized actually calculated floating shoulderhigh flight giant Indoor model clearly sure serious injury highiy unlikely considered prob lem decided would problem erased mind Years later history Gossamer Condor Albatross projects confirmed principles extreme lightuess easy repairability two keys success human-powered flight As breaks fix dozens crashes Condor Albatross sur vived serious injury proved underneath its apparent casualness Dr Lip pischs maxim expressed sound engineer ing principle Dr Alexander Lippisch man ahead time ideas advanced spent whole adult life dragging much aeronautical world along behind him Trying convince doubting experts hed snort used term pleading businessmen research funds trying make rest us see future through eyes Sustaining kind effort year after year demands combination qualities few men possess Probably vivid sense humor traits made possible Doctor Lippischs brilliant leadership aeronautical science nearly 60 years CL Aerobatics/Fancher Continued page 74 response rate somewhat Nonetheless found ship could flown fairly comfort ably supplied Dacron lines handle later fly ship bellcrank itself mounted top wing control lines exit fuselage along top inboard wing similar cur rent Combat models clever two-piece lead out guide provided locate lead-outs January 1989 181 Stand Off Extra 230 Kits Scale Now Available Three Sizes 1/3 Scale Kit plus Sl5shipping 30% Scale Kit plus 515 shipping 1/4 Scale Kit ~ plus 510 shipping Also Available Weeks Special ~ plusSl5ship Cash VISA Certified Check R/C EXTRAS 712-943-4102 RR1 Box 288 Sergeant Bluff IA 51054 inboard tip Unfortunately guide ad justable self-adhesive decals worth moment time Decals will never adhere like good painted trim scheme However Chipmunks dont half bad would suggest skip white canopy outline since started peel after flight Also apply decals before assembly makes job much easier Press down firmly around molded plas tic details such panel lines rivets pre vent fuel seepage used fingernail nervous Stunt stars may have resort tool some kind Also note top bottom foam wing Yours truly particularly dun derheaded moment initially attached blue leading edge trim sheets bottom sur face remove BIUGOG mistake Once hits foam stickum will never restick aggressively finally seal edges some clear Fascal prevent lifting sure youve got decals prop erly located before pressing place foam isnt critical plastic piec es very pleased Chipmunk mechani cally exception slightly fast con trol hookup Frum design flight trim stand point few items concerned however surprised note although wings equal length no provision made wing tip weight basic trim feature Control Line airplane designed maneuver ing mind certain would serious deficiency tempted add some weight Outset decided against doing Perhaps come up different lution problem missing After completing assembly checked lo cation center-of-gravity after 30 years flying Stunt seems like second nature pick up Stunt ship first time wing tips proper location CG such integral part Stunt trim always first thing want learn about new ship worked Out excellent 145% mean aerodynamic chord MAC just about what would have ex pected unflapped design However location CG seemed just right what didnt like location lead-out guide fixed unadjustable loca tion full 1 aft CG air plane size weight airspeed would have expected no 1A 4 starting have some doubts about final flight trim Chipmunk delivered come ask Well us know line tension Control Line aint got nothin Whatever else optimize flight trim know maintaining line tension must paramount decisions classic solutions problem have always en gine offset lead-out sweep rudder offset Chipmunk has abundance However will bit good outboard wing flies consistently higher inboard does part lift vector will directed circle line tension will lost Since outboard wing always flies further inboard flies faster produces lift additional lift will make fly higher inboard unless utilize trim device counteract tendency Two solutions generally used tip weight and/or longer inboard wing equalize lift As previously noted Chipmunk has equal-length wings NO tip weight beginning wonder excessive lead-out sweep might attempt generate line tension lost through lack wing tip weight Only through actual flight tests would truth known morning test flights dawned Since total experienee limited about li/i flights some 15 years ago stock up some necessities werent supplied Chip included battery clips half-pint Cox fuel hobby shop David Fitzgerald five-time Junior Sen ior National Stunt Champion pilot ex traordinaire house way Mr Cox appalled $598 price tag half-pint fuel ratenearly $100 per gallonan ST 60 would burn about five bucks fuel flight Its hard believe little cans could justif price tag Initial test flights kind mixed bag engine started willingly fall day tended go rich quit going verted Several inverted landings made before ever got wheels dirty David sug gested possible loose glow head Sure enough after tightening head engine performed flawlessly rest day first flight using Cox-supplied Dacron lines handle immediately justified ear lier concern about line tension Although Chip responded aggressively line tension flight levels above about 450 almost nonexis tent outboard wing flew noticeably higher inboard both upright inverted clas sic symptom insufficient tip weight immediately began adding tip weight quarter-ounce increments using Prather stick-on trim weights settled total ottom right wing tip about line CG improvement performance immediate impressive Tension now adequate attitude sowith engine really hummingwe settled down some serious flying obvious increased line ten sion such short lines neither necessary nor desirable substituted set 008-in x 30-ft steel cables Sullivan Insta-Just #2 control handle 27-ft Dacron lines again no ticed substantial improvement Lap times comfortable tension still adequate would guess several feet line could added further trim adjustments lot finesse entire pattern could simulated Round maneuvers could performed very well squares approached caution turned too abruptly ship slows ex cessively time space eaten up accelerates feel moving lead-out guide forward will substantially improve ten dency since Chip will flying straight off lines rather cocked outward does now should reduce drag considerably Coxs Chipmunk dandy simple addition -oz tip weight great sport flier head shoulders above other plastic ARF serious tinkerer sub stantially performance available through judicious twealting fact Ive already redrilled new pushrod hole bellcrank 04 pivot Im repositioning lead-out guide about her forward Im tying new set 008in x 33-ft lines Give dozen flights Watch out Jimmy Casale Editors note couple weeks after colum nist Ted Fancher submitted manuscript spoke representative Cox Hobbies Ted sent letter Cox describing experience Super Chipmunk deficiencies 182 Model Aviation observed lack tip weight toorearward location lead-out guide Cox representative stated very pleased Teds efforts assured us Cox immediately making changes Su per Chipmnnk tooling improve model indicated Super Chipmunks improve ments incorporated would rolling off pro duction line about time issue Model Aviation reaches readers RMcM CL Scale/Boss Continued page 75 9 Union Avenue Little Ferry NJ 07643 has sev eral items readers column might terested knowing about first large plastic line reel has become hard-to-find item reel made high-visibility plastic easily lost misplaced molded right- left-hand operation reel has line storage area inch wide has diam eter about five inches comes equipped two line-clip holders reel priced $995 includes shipping An item could helpful fin ishing models 1200-grit sandpaper can used wet dry sald scratch 400/500/600-grit papers Windy also indicates has VHS videotapes modeling avallable particular interest Scale modeler footage 1988 CL World Championships Kiev USSR For catalog CL items handled Pro-Stunt write Windy address stated above Trophies something always con cerned planning next contest Oftentimes looking something unique different usual Victory figure-topped award need something really different might want look plaques ing offered Jennings Trophy Sales Hender sonville TN Jennings offering two series plaques 100 400 Series exactiy suited aeromodelers needs 100 Series features model engraving depicting various events RC CL FF 400 Series engraved two views usually front side alr planes such Beechcraft T-34C Grumman E2C Hawkeye etc Both series plaques also have engraving plates contest event information cost unique plaques right line cost awards given contests So youre looking something different write Jennings Trophy 13 Walton Mall PO Box 1121 Hendersonville TN 37077 Im sure will happy send catalog 1988 Directory CL Scale Items Model Aviation January History CL electronic control systems Mike Gretz Electric flap control Jerry Blaszczyk February Profile Scale activity update George Gaydos Workshop hint Bob Furr Prop balancing storage March Bonding adhesives Chris Shearer Hobbypoxy paint formulas Lemon Yellow Willow Green Kits plans sources Continued page 186 L KOVR-KUTR Covering material dispenser model KKA-030 assembled As seen Nov 88 issue RCM ALL 3034 65-5~ Office hours 830 am 430 pm MST CODs add $300 PIT-KIT Field box model PKK-01 0 kit model PKR-020 assembled As seen Jan 89 issue RCM FREE SHIPPING colorado model products Inc 555 Alter St PO Box 550 Broomfield CO 80020 Dept MA * 48 contiguous states January 1989 183 100/0 NSA t4 K1 $25 95 asse 49
