Dr DB Mathews Flying Fun 909 N Maize Rd Townhouse 734 WIchita KS 67212 OOPS expression should never used physician dentist during procedure QOPS nonclinical setting however permissible term certaialy applies least twice recent columns So lets set record straight Cessna AW-l RCSD model pictured August 1991 column based published design Jim Adams beautiful version shown handiwork Walt Geary Absecom New Jersey Jeep thing October 1991 copy miscue certainly illustrates adage first memory goes Jeep cartoon character appeared Popeye Alley Oop surprising number readers wrote set mistake straight Seems military referred small four-wheel drive vehicle General Purpose unit abbreviate military fashion GP Obviously GIs Willys Motor altered Jeep Art Chester obviously Popeye fan calling racing aircraft names like Sweetpea Goon well Jeepall characters cartoon strip Bill Dahlgren wrote advise about another aircraft nicknamed after character Thimble Theater Popeye strip Bill says also strip portly hamburger-addicted freeloader Ill gladly pay Wednesday hamburger today named J Wellington Wimpy Combining rotund appearance both man plane name string may well explain British airmen period nicknamed Vickers Wellington bomber Wimpy rather clever multiple pun indeed Thanks Bill MA Editorial staff loved Les Long Washington State also developed neat little low-winged homebuilt named Wimpy Cant help wondering other aircraft named after cartoon strip characters Any think others EATING HUMBLE PIE Only madman someone monstrous ego would attempt develop another trainer seem suffer both maladies project has certainly deflated ego what does leave Apparently first MA July 1975 suggest Free Flight designs 1930s made excellent trainers RC added Several manufacturers have proven concept trainers designed around Old Timer parameters ie light wing loadings low power large size inherent built-in stability high-lift airfoils Unfortunately no virtue obtained some compromise Lets candid Stick strip construction used Old Timers contemporary clones inherently difficult build accurately leaves lot desired reparability after inevitable mishaps associated learning fly RC Highlift wing airfoils either undercambered true flat bottomed lend themselves well wide air speed fluctuations invariably rather twitchy windy weather Additionally light wing loadings large-ish empennages wide fuselage profiles contribute serious problems flying moderate winds Anyone has flown lightly loaded flat bottomed wing setup has become painfully aware what handful sort model can winds much over 10 mph Simply put jump wildly side side 30 Model Aviation 4tfl graae teacner pretty asTrom Built Lonnie Goad Strasburg VA plane powered y 03 2 two-stroke Junkers JU 52-3M David Stroup Mt Clemens Mi utilizes ten servos Nose engine normal throttle stick Outboards use auxilliary channel three engines OS 1 2OFS Silk dope model weighs 48 lb done original drawings Tiny Camper Swift FF Scale model pub lished old British modeling magazine Model Aircraft April 1957 Ron Warring Or Thomas Hultgren Stockholm powers Czech LD 006 cuin diesel 2/3 dis placement Cox 10 Span 18 up weight 1 oz up down maddeningly wide trim changes necessary between up wind/down-wind also time throttle speed varied Its nature flat-bottomed-airfoil beast 1983 during development original 4-40 noted although certaialy didnt look like average trainer atypical semisymmetrical airfoil fool thing wonderfully docile predictable speed wind velocity further observed perhaps apparent testing stages 4-60 1985 since advantage larger size concomitant ease visibility Both very docile flown reduced throttle trainer-like manner fact would fly nearly slowly bit much built-in stability trainers winds increased trainers would grounded 4-40 4-60 still manageable Several flying buddies made remarks like would make excellent first airplanes could convince anyone trainers would provide beginner model could grow flying skills increase Taking baithook line sinker set off what perceived simple task developing trainer utilizing airfoil moments other parameters 4-series ego got way common sense No way going turn out simple Over years Id done kit reviews various magazinessometimes under own name sometimes under pseudonym sometimes no by-line series reviews provided opportunity build fly larger sample what market considered trainer also provided chance steal lot good ideas own use didnt review trainer didnt like some course liked others urge hit design trainer own decided scientific possible set out interview instructors could asked preferences ideal trainer should configured Tricycle gear tail dragger engine size high low wing powered glider fully symmetrical flat bottom construction lots stability lots dihedral three channel four channel two channel etc etc on Like opinion surveys statistics proved useless didnt seem consensus whatsoever Beyond solid preference 40 two-cycle power rest opinions could have combined design camel concluded personal preferences good guideline likely find So set off what proved long journey Deciding discard preconceived notions about what parameters trainer ought plunged ahead what observed 4-series non-trainers drew up high wing 4-60 longer nose tail moments wing span built Six models ton changes later what Ive learned tail dragger configuration seems preferable model flown rough grass strips model easier control nose gear takes terrible beating rough grass Conversely smooth runway trike geared setup seems easier handle tiller block accessible front model buried under structure Obviously wide-set main landing gear rather robust also definite plus should mounted can sheer away rough landings removing fuselage bottom Several airfoil incidence angle/decalage setups tried arranged adjustable wind saddle prototype test various incidence settings settled fairly thin semi-symmetrical section set marked positive angle attack seems best suited good wind penetration wild swings horizontal vertical planes configuration learned semisymmetrical section set high angle attack would behave well flat section added advantage vastly superior behavior wind finally dawned semi-section much like Clark Y airfoil set way Consider Piper Cub Aeronca Champ T-craft matter have flat bottom sections modelers know underside section flat leading edge trailing edge Rather underside curves upward front 20% section February 1992 31 Malsa UA Allure Z-M giiaer witn eiecric aucica Tan IS oy uien wneemer vvIdnu, powered Astro cobalt 035 wIth six l700mA SCE pack Kens own speed contra bladed 37/i ducted fan tight-fitting shroud Power equivalent Black Widow Continued page 8S neres oi UOCS prololypes ne con cept Stolen Owen Kampens clas sic Whizard design modi fied floats rise beautifully off water Whiz 40 makes slow-speed Inverted pass Four-foot barbed wire fence back ground gives clue height Try flat-bottomed airfoil Over next few weeks company manufactured nearly 50 models christened Jammin Jets Madison Avenue advertising agency engineer technician salesman out learning fly Some novice fliers achieved durations half minutes benefit thermals improve power phase emulated delayed prop release Wakefield modifying valve water jet does start until model has launched way stored energy fully utilized Production next step tooling Since foam molding done cast aluminum cavities molds wood pattern must first fabricated surprise master patternmakers Massachusetts-based pattern shop assigned work turned out old-time modeler nice break since no problems communicating technical happy ending Concurrenfly tooling other preparation mass production another dose fun came way company agreed back sales effort childrens prime-time TV ad campaign job produce 30-second commercial same New York advertising agency dreamed up models name selected compose jingle score prepare story line Hollywood company filmed commercial location Osmond Brothers studios Provo Utah engineering group supplied models production technical support built test flew 50 models enlisted Scott Croizier Cleveland Ohio build two electrically powered RC airplanes Jammin Jet silhouette intended flybys remote filming end RC models used lot fun flying child actors no idea launch Free Flight model trained spot Most caught within hour became engrossed impromptu contests arranged filming yielded 18000 feet celluloid 3000 feet selected Accompanied captivating theme song High Can Fly 30-second commercial showed bunch kids rising sun backs flying Jammin Jet against Utah mountain horizon beautiful spectacularand successful million half models shipped next year Free Flight forever article dedicated late good friend Scott Croizier Free Flight modeler well family man professional pilot brave spirit Scott left us last yearE Flying Fun/Mathews Continued page 31 leading edge above trailing edge datum line drawn other words Clark Y section would call flat bottomed very Continued page 86 PLUG IN WINGS / ADVANCED FULL SYMETRICAL AIRFOIL / RATED FOR ALL MANEUVERS INCLUDING MAXIMUM G PULL UPS / CLEAN AERODYNAMIC DESIGN IS FAST STABLE AND EFFICIENT TM z 2 0 0 0 C 4 4 0 n Wingspan 47Area 460 sq 2 Assembly Time 6 hrs mas Lenght 42Weight 475-500 lb PRE-ASSEMBLED AND INSTALLED HAYES MOUNT NOSEGEAN 8 OZ HAYES TANK SULUVAN SKYLITE WHEELS SULLIVAN PUSHROOS CONTROL HORNS GAPLESS HINGES ALL AROUND February 1992 85 nomenclatureairfoil washout angle Jammin/Dondeincidence etc Continued page 75 COMPLETELY ASSEMBLED & FINISHED OUT OF THE BOX NO GLUE PAINT OR COVERING REQUIRED INSTALL YOUR RADIO 35-46 ENGINE AND PROP AT THE FIELD COMPUTER DESIGNED & BUILT BY MIT AEROSPACE ENGINEERS INCREDIBLE FLIGHT PERFORMANCE AND QUALITY BUILT-IN Hi-G introduces theMhUIIISUhUiI 0 VISA & MC Accepted Orders & Info 602-788-5209 H -G 2131 E Crocus Dr Phoenix AZ 85022 close phone gsPeoPIeof CameLc% M#44 %ee important difference Generous amounts downthrust combined couple degrees right thrust seemed lock models flight straight ahead regardless throttle setting also learned trim strongly affected prop diameter pitch concluded thrust offsets have tailored prop vice versa Therefore beam mounts dont quite have much easier fine tune thrust settings engine mounted firewall shims can used light strong wing about 800 in2 found ideal loading could kept 10 12 oz/ft2 range Use spruce spars sheer webs also jigs rib setting airfoil could built flat main spar trailing edge made construction rather simple Elimination cap strips sheeted leading edges certainly eliminated lot tedious work well construction technique has evolved over several years good enough being copied other designers find flattering After six prototypes several construction methods fuselage settled classic crutch construction stole Owen Kampens classic Whizard design Combining technique light ply tab-in-slot construction enables builder create fuselage unfailingly true square crutch placed upside-down over top view bulkheads sides aligned bottom added whole shebang stuck together cyanoacrylate resulting box removed cabin/wing saddle box assembled onto removable tank hatch absolute must opinion punched out crutch two temporary cutouts under wing saddle create radio compartment Only incredible klutz could build fuselage crooked Once justified stealing Kampens construction technique felt whole lot less guilty about configuring Whiz resemble much larger Whizard keeping things thin light behind wing longish front able develop fuselage unusually long moments dampen wind control induced yaw pitch requiring ballast balance help equipment installation service found extra-wide fuselage looked fine longish fuselage largest servos can mounted side side greatly simplify installation tried prototype increased dihedral no ailerons again humbled Years ago wrote product review what has become classic trainer building two matter fact ailerons other alternate high dihedral no ailerons felt three channel version superior definitely stable strong self correction recovering turns forth particular design uses very sharp entry leading edge true flat bottomed airfoil Apparently control airfoil design also incorporates 5 6 positive incidence stab set up winds however design pitched badly high dihedral caused some roll axis problems well Conversely Whiz project has proven much better moderate dihedral/aileron configuration Ailerons also add virtue being able pick up down wing gust wind hits model final So Continued page 92 ALL THREADS price $169 package 8 Use sleeves material CA will bond Six sizes #2 #4 #6 #8 #101/4 x 20 Perfect hatches cowls canopies engines servos landing gears wings anything mounts machine screw metal screw thread Uses depend imagination Color sleeve denotes size Can used thread lockers PRESS IN SLEEVE Ohio 4pere 11376 Ridgeway Road Kensington OH 44427 216-223-1950 86 Model Aviation orYS 1-800-535-2568 accept RUU ng Fun/Mathews Continued page 86 much long-held opinion ailerons dont belong trainers Configuring empennage proved enlightening experience well Vertical horizontal stab columns dictated wing area span length fuselage moments knows found volume excessive model will wind-vane badly and/or subject pitch axis problems wind Conversely too little empennage volume adversely affects stability particularly slow flight $9995 8 Ch 50 53 72 75 Mhz Dont scrap favorite AM KRAFT Heathkit Hobbyshack Royal Tower Hobbies World Engines other TRANSMITTERS SERVOS Upgrade latest AM technology proven design minisize dual conversion ultra narrow band reliability R/C REPAIRS KMI largest complete independent RIC repair center USA repair brands Send SAF complete price repair product information RCD-KMI 6 Meter EXCLUSIVE Disdaining mathematical formulas set out find trial error just much enough actually rigged prototype strap-on-stab fin tips proceeded fly various sizes learned several things tend design models enough horizontal stab shape almost important size As example tall narrow vertical stab combined dorsal fin provides turns less tendency tighten up spiral short stubby unit Dont exactly know thats what discovered Sofive years six prototypes later lots messing around modifications what did end 2-wheel gear 1 ycIe 1 7995 includes amplifier w Kraft Midwest Inc 115 E Main Northville MI 48167 313/348-0085 313/348-4175 up trainer totally different original conception As said up front ego must dealt lest get way admitting dont know Im sure know nowbut have found lots things certainly have increased fund knowledge Whiz no inherently stable other trainer know builds no easier another Ive built no sturdy repairable another isnt great deal easily maintained another Only thing single design comes awfully close matching best virtues other trainer designs package Whiz definitely easier taxi take off fly land winds above 10 mph other trainer Ive flown learning fly encountering frustrations trying coordinate instructors time time wind tremendous advantage final configuration can trimmed fly hands off transmitter ground youre brave will land itself low throttle after final approach has set up Yet throttle open hands experienced pilot Whiz can consecutive inside outside loops nice axial rolls well controlled cubans extraordinary walking speed low level inverted passes Ive ever witnessed virtues peculiar project believe Ive asked several times present programs local clubs explaining goes about designing model airplane seemed appropriate time relate readers what process can like Please note studiously avoid long-winded technical dissertations sorts fancy mathematical formulas airfoil numbers such Because franldy have never understood feel real proof model airplane design theoretical dogma plain old flying performance proof pudding eating proof design flying So think Ive developed perfect trainer No dont Considering wide variances beginners hand eye coordination reflex rates visual acuity personalities skills instructors really isnt such thing perfect trainer size fits However Whiz versatile other know am extremely proud project hope effort has worthwhile Lord knows Ill never let myself get caught ego/madness complex again CLOSING THE GAP Like almost everyone Ive known years about advantages sealed surface gaps model airplanes 92 Model Aviation 1991 KMI ULTRA AM RECEIVER y KMI RETRACTS occasion Ive sealed space between trailing edges ailerons etc Scotch magic tape attempted iron heat-shrink top heat-shrink arrangement works Ive also dissatisfied gooey mess builds up interface fuel oil creep between covering sealing tape John Walker Wichita recently built 4-120 bipe converted Ultimate look-alike sort thing first thing caught attention delivered sealed surfaces piece MonoKote After carefully looking fleet models found has doing several years Id never really noticed Maybe everyone does new John cuts section covering size area covered seals borders wing etc leaving movable surface unattached until flexes surface seals gap attaches movable surface uses heat gun shrink covering both parts Let describe covering stab order clarif First hinges installed permanently covering material tacked periphery horizontal stab including area hinge line Next elevator flexed up down depending whether top bottom being covered elevator covering pulled tight sealed borders Finally trim seal tool used seal covering gap resulting seal totally air proof stays clean important makes incredible improvement responsiveness surface also its smoothness air illustrate am third prototype 40 two-cycle sized BINGO first has very crisp roll rate second very sluggish aileron input examination consideration difference traced hinge gap first unit uses Hot Hinges second uses molded pin-type nylon units gap difference about A6 went back sealed ailerons second prototype able reduce total aileron throw half same roll rate rolls smoothed out Suddenly same twitchy ailerons capable producing axial rolls better knife-edge flight crisp eight point rolls Reducing up aileron also reduces down therefore produces less adverse yaw Are sealed surfaces worth trouble Yes indeed Particularly onepiece covering technique used Im convinced newer models have sealed surfaces yours dont please consider doing youll astounded D Slope/Garwood Continued page 35 steep hill 40 feet above upwind terrain flying may possible winds light 10 mph Lower hills gentler slopes likely require faster winds Its easier fly big hills because lift zone larger small hills can used favorable winds know sure try hill different wind conditions single important characteristic good slope faces wind youre lucky enough find slope faces prevailing wind area youll able fly often other end scale favorite sites hill requires northeasterly wind worksomething get about day 45 seems serious Sloper continues search good hills until hes found major point compass Its important hill have minimum trees vegetation Upwind obstructions create turbulence top Trees bushes slope face its top make tricky find good landing spot hill has road top wont have hike up down model radio tow optional its helpful enough worth February 1992 93 responding advertisers mention read about Model Aviation
Edition: Model Aviation - 1992/02
Page Numbers: 30, 31, 85, 86, 92, 93
Dr DB Mathews Flying Fun 909 N Maize Rd Townhouse 734 WIchita KS 67212 OOPS expression should never used physician dentist during procedure QOPS nonclinical setting however permissible term certaialy applies least twice recent columns So lets set record straight Cessna AW-l RCSD model pictured August 1991 column based published design Jim Adams beautiful version shown handiwork Walt Geary Absecom New Jersey Jeep thing October 1991 copy miscue certainly illustrates adage first memory goes Jeep cartoon character appeared Popeye Alley Oop surprising number readers wrote set mistake straight Seems military referred small four-wheel drive vehicle General Purpose unit abbreviate military fashion GP Obviously GIs Willys Motor altered Jeep Art Chester obviously Popeye fan calling racing aircraft names like Sweetpea Goon well Jeepall characters cartoon strip Bill Dahlgren wrote advise about another aircraft nicknamed after character Thimble Theater Popeye strip Bill says also strip portly hamburger-addicted freeloader Ill gladly pay Wednesday hamburger today named J Wellington Wimpy Combining rotund appearance both man plane name string may well explain British airmen period nicknamed Vickers Wellington bomber Wimpy rather clever multiple pun indeed Thanks Bill MA Editorial staff loved Les Long Washington State also developed neat little low-winged homebuilt named Wimpy Cant help wondering other aircraft named after cartoon strip characters Any think others EATING HUMBLE PIE Only madman someone monstrous ego would attempt develop another trainer seem suffer both maladies project has certainly deflated ego what does leave Apparently first MA July 1975 suggest Free Flight designs 1930s made excellent trainers RC added Several manufacturers have proven concept trainers designed around Old Timer parameters ie light wing loadings low power large size inherent built-in stability high-lift airfoils Unfortunately no virtue obtained some compromise Lets candid Stick strip construction used Old Timers contemporary clones inherently difficult build accurately leaves lot desired reparability after inevitable mishaps associated learning fly RC Highlift wing airfoils either undercambered true flat bottomed lend themselves well wide air speed fluctuations invariably rather twitchy windy weather Additionally light wing loadings large-ish empennages wide fuselage profiles contribute serious problems flying moderate winds Anyone has flown lightly loaded flat bottomed wing setup has become painfully aware what handful sort model can winds much over 10 mph Simply put jump wildly side side 30 Model Aviation 4tfl graae teacner pretty asTrom Built Lonnie Goad Strasburg VA plane powered y 03 2 two-stroke Junkers JU 52-3M David Stroup Mt Clemens Mi utilizes ten servos Nose engine normal throttle stick Outboards use auxilliary channel three engines OS 1 2OFS Silk dope model weighs 48 lb done original drawings Tiny Camper Swift FF Scale model pub lished old British modeling magazine Model Aircraft April 1957 Ron Warring Or Thomas Hultgren Stockholm powers Czech LD 006 cuin diesel 2/3 dis placement Cox 10 Span 18 up weight 1 oz up down maddeningly wide trim changes necessary between up wind/down-wind also time throttle speed varied Its nature flat-bottomed-airfoil beast 1983 during development original 4-40 noted although certaialy didnt look like average trainer atypical semisymmetrical airfoil fool thing wonderfully docile predictable speed wind velocity further observed perhaps apparent testing stages 4-60 1985 since advantage larger size concomitant ease visibility Both very docile flown reduced throttle trainer-like manner fact would fly nearly slowly bit much built-in stability trainers winds increased trainers would grounded 4-40 4-60 still manageable Several flying buddies made remarks like would make excellent first airplanes could convince anyone trainers would provide beginner model could grow flying skills increase Taking baithook line sinker set off what perceived simple task developing trainer utilizing airfoil moments other parameters 4-series ego got way common sense No way going turn out simple Over years Id done kit reviews various magazinessometimes under own name sometimes under pseudonym sometimes no by-line series reviews provided opportunity build fly larger sample what market considered trainer also provided chance steal lot good ideas own use didnt review trainer didnt like some course liked others urge hit design trainer own decided scientific possible set out interview instructors could asked preferences ideal trainer should configured Tricycle gear tail dragger engine size high low wing powered glider fully symmetrical flat bottom construction lots stability lots dihedral three channel four channel two channel etc etc on Like opinion surveys statistics proved useless didnt seem consensus whatsoever Beyond solid preference 40 two-cycle power rest opinions could have combined design camel concluded personal preferences good guideline likely find So set off what proved long journey Deciding discard preconceived notions about what parameters trainer ought plunged ahead what observed 4-series non-trainers drew up high wing 4-60 longer nose tail moments wing span built Six models ton changes later what Ive learned tail dragger configuration seems preferable model flown rough grass strips model easier control nose gear takes terrible beating rough grass Conversely smooth runway trike geared setup seems easier handle tiller block accessible front model buried under structure Obviously wide-set main landing gear rather robust also definite plus should mounted can sheer away rough landings removing fuselage bottom Several airfoil incidence angle/decalage setups tried arranged adjustable wind saddle prototype test various incidence settings settled fairly thin semi-symmetrical section set marked positive angle attack seems best suited good wind penetration wild swings horizontal vertical planes configuration learned semisymmetrical section set high angle attack would behave well flat section added advantage vastly superior behavior wind finally dawned semi-section much like Clark Y airfoil set way Consider Piper Cub Aeronca Champ T-craft matter have flat bottom sections modelers know underside section flat leading edge trailing edge Rather underside curves upward front 20% section February 1992 31 Malsa UA Allure Z-M giiaer witn eiecric aucica Tan IS oy uien wneemer vvIdnu, powered Astro cobalt 035 wIth six l700mA SCE pack Kens own speed contra bladed 37/i ducted fan tight-fitting shroud Power equivalent Black Widow Continued page 8S neres oi UOCS prololypes ne con cept Stolen Owen Kampens clas sic Whizard design modi fied floats rise beautifully off water Whiz 40 makes slow-speed Inverted pass Four-foot barbed wire fence back ground gives clue height Try flat-bottomed airfoil Over next few weeks company manufactured nearly 50 models christened Jammin Jets Madison Avenue advertising agency engineer technician salesman out learning fly Some novice fliers achieved durations half minutes benefit thermals improve power phase emulated delayed prop release Wakefield modifying valve water jet does start until model has launched way stored energy fully utilized Production next step tooling Since foam molding done cast aluminum cavities molds wood pattern must first fabricated surprise master patternmakers Massachusetts-based pattern shop assigned work turned out old-time modeler nice break since no problems communicating technical happy ending Concurrenfly tooling other preparation mass production another dose fun came way company agreed back sales effort childrens prime-time TV ad campaign job produce 30-second commercial same New York advertising agency dreamed up models name selected compose jingle score prepare story line Hollywood company filmed commercial location Osmond Brothers studios Provo Utah engineering group supplied models production technical support built test flew 50 models enlisted Scott Croizier Cleveland Ohio build two electrically powered RC airplanes Jammin Jet silhouette intended flybys remote filming end RC models used lot fun flying child actors no idea launch Free Flight model trained spot Most caught within hour became engrossed impromptu contests arranged filming yielded 18000 feet celluloid 3000 feet selected Accompanied captivating theme song High Can Fly 30-second commercial showed bunch kids rising sun backs flying Jammin Jet against Utah mountain horizon beautiful spectacularand successful million half models shipped next year Free Flight forever article dedicated late good friend Scott Croizier Free Flight modeler well family man professional pilot brave spirit Scott left us last yearE Flying Fun/Mathews Continued page 31 leading edge above trailing edge datum line drawn other words Clark Y section would call flat bottomed very Continued page 86 PLUG IN WINGS / ADVANCED FULL SYMETRICAL AIRFOIL / RATED FOR ALL MANEUVERS INCLUDING MAXIMUM G PULL UPS / CLEAN AERODYNAMIC DESIGN IS FAST STABLE AND EFFICIENT TM z 2 0 0 0 C 4 4 0 n Wingspan 47Area 460 sq 2 Assembly Time 6 hrs mas Lenght 42Weight 475-500 lb PRE-ASSEMBLED AND INSTALLED HAYES MOUNT NOSEGEAN 8 OZ HAYES TANK SULUVAN SKYLITE WHEELS SULLIVAN PUSHROOS CONTROL HORNS GAPLESS HINGES ALL AROUND February 1992 85 nomenclatureairfoil washout angle Jammin/Dondeincidence etc Continued page 75 COMPLETELY ASSEMBLED & FINISHED OUT OF THE BOX NO GLUE PAINT OR COVERING REQUIRED INSTALL YOUR RADIO 35-46 ENGINE AND PROP AT THE FIELD COMPUTER DESIGNED & BUILT BY MIT AEROSPACE ENGINEERS INCREDIBLE FLIGHT PERFORMANCE AND QUALITY BUILT-IN Hi-G introduces theMhUIIISUhUiI 0 VISA & MC Accepted Orders & Info 602-788-5209 H -G 2131 E Crocus Dr Phoenix AZ 85022 close phone gsPeoPIeof CameLc% M#44 %ee important difference Generous amounts downthrust combined couple degrees right thrust seemed lock models flight straight ahead regardless throttle setting also learned trim strongly affected prop diameter pitch concluded thrust offsets have tailored prop vice versa Therefore beam mounts dont quite have much easier fine tune thrust settings engine mounted firewall shims can used light strong wing about 800 in2 found ideal loading could kept 10 12 oz/ft2 range Use spruce spars sheer webs also jigs rib setting airfoil could built flat main spar trailing edge made construction rather simple Elimination cap strips sheeted leading edges certainly eliminated lot tedious work well construction technique has evolved over several years good enough being copied other designers find flattering After six prototypes several construction methods fuselage settled classic crutch construction stole Owen Kampens classic Whizard design Combining technique light ply tab-in-slot construction enables builder create fuselage unfailingly true square crutch placed upside-down over top view bulkheads sides aligned bottom added whole shebang stuck together cyanoacrylate resulting box removed cabin/wing saddle box assembled onto removable tank hatch absolute must opinion punched out crutch two temporary cutouts under wing saddle create radio compartment Only incredible klutz could build fuselage crooked Once justified stealing Kampens construction technique felt whole lot less guilty about configuring Whiz resemble much larger Whizard keeping things thin light behind wing longish front able develop fuselage unusually long moments dampen wind control induced yaw pitch requiring ballast balance help equipment installation service found extra-wide fuselage looked fine longish fuselage largest servos can mounted side side greatly simplify installation tried prototype increased dihedral no ailerons again humbled Years ago wrote product review what has become classic trainer building two matter fact ailerons other alternate high dihedral no ailerons felt three channel version superior definitely stable strong self correction recovering turns forth particular design uses very sharp entry leading edge true flat bottomed airfoil Apparently control airfoil design also incorporates 5 6 positive incidence stab set up winds however design pitched badly high dihedral caused some roll axis problems well Conversely Whiz project has proven much better moderate dihedral/aileron configuration Ailerons also add virtue being able pick up down wing gust wind hits model final So Continued page 92 ALL THREADS price $169 package 8 Use sleeves material CA will bond Six sizes #2 #4 #6 #8 #101/4 x 20 Perfect hatches cowls canopies engines servos landing gears wings anything mounts machine screw metal screw thread Uses depend imagination Color sleeve denotes size Can used thread lockers PRESS IN SLEEVE Ohio 4pere 11376 Ridgeway Road Kensington OH 44427 216-223-1950 86 Model Aviation orYS 1-800-535-2568 accept RUU ng Fun/Mathews Continued page 86 much long-held opinion ailerons dont belong trainers Configuring empennage proved enlightening experience well Vertical horizontal stab columns dictated wing area span length fuselage moments knows found volume excessive model will wind-vane badly and/or subject pitch axis problems wind Conversely too little empennage volume adversely affects stability particularly slow flight $9995 8 Ch 50 53 72 75 Mhz Dont scrap favorite AM KRAFT Heathkit Hobbyshack Royal Tower Hobbies World Engines other TRANSMITTERS SERVOS Upgrade latest AM technology proven design minisize dual conversion ultra narrow band reliability R/C REPAIRS KMI largest complete independent RIC repair center USA repair brands Send SAF complete price repair product information RCD-KMI 6 Meter EXCLUSIVE Disdaining mathematical formulas set out find trial error just much enough actually rigged prototype strap-on-stab fin tips proceeded fly various sizes learned several things tend design models enough horizontal stab shape almost important size As example tall narrow vertical stab combined dorsal fin provides turns less tendency tighten up spiral short stubby unit Dont exactly know thats what discovered Sofive years six prototypes later lots messing around modifications what did end 2-wheel gear 1 ycIe 1 7995 includes amplifier w Kraft Midwest Inc 115 E Main Northville MI 48167 313/348-0085 313/348-4175 up trainer totally different original conception As said up front ego must dealt lest get way admitting dont know Im sure know nowbut have found lots things certainly have increased fund knowledge Whiz no inherently stable other trainer know builds no easier another Ive built no sturdy repairable another isnt great deal easily maintained another Only thing single design comes awfully close matching best virtues other trainer designs package Whiz definitely easier taxi take off fly land winds above 10 mph other trainer Ive flown learning fly encountering frustrations trying coordinate instructors time time wind tremendous advantage final configuration can trimmed fly hands off transmitter ground youre brave will land itself low throttle after final approach has set up Yet throttle open hands experienced pilot Whiz can consecutive inside outside loops nice axial rolls well controlled cubans extraordinary walking speed low level inverted passes Ive ever witnessed virtues peculiar project believe Ive asked several times present programs local clubs explaining goes about designing model airplane seemed appropriate time relate readers what process can like Please note studiously avoid long-winded technical dissertations sorts fancy mathematical formulas airfoil numbers such Because franldy have never understood feel real proof model airplane design theoretical dogma plain old flying performance proof pudding eating proof design flying So think Ive developed perfect trainer No dont Considering wide variances beginners hand eye coordination reflex rates visual acuity personalities skills instructors really isnt such thing perfect trainer size fits However Whiz versatile other know am extremely proud project hope effort has worthwhile Lord knows Ill never let myself get caught ego/madness complex again CLOSING THE GAP Like almost everyone Ive known years about advantages sealed surface gaps model airplanes 92 Model Aviation 1991 KMI ULTRA AM RECEIVER y KMI RETRACTS occasion Ive sealed space between trailing edges ailerons etc Scotch magic tape attempted iron heat-shrink top heat-shrink arrangement works Ive also dissatisfied gooey mess builds up interface fuel oil creep between covering sealing tape John Walker Wichita recently built 4-120 bipe converted Ultimate look-alike sort thing first thing caught attention delivered sealed surfaces piece MonoKote After carefully looking fleet models found has doing several years Id never really noticed Maybe everyone does new John cuts section covering size area covered seals borders wing etc leaving movable surface unattached until flexes surface seals gap attaches movable surface uses heat gun shrink covering both parts Let describe covering stab order clarif First hinges installed permanently covering material tacked periphery horizontal stab including area hinge line Next elevator flexed up down depending whether top bottom being covered elevator covering pulled tight sealed borders Finally trim seal tool used seal covering gap resulting seal totally air proof stays clean important makes incredible improvement responsiveness surface also its smoothness air illustrate am third prototype 40 two-cycle sized BINGO first has very crisp roll rate second very sluggish aileron input examination consideration difference traced hinge gap first unit uses Hot Hinges second uses molded pin-type nylon units gap difference about A6 went back sealed ailerons second prototype able reduce total aileron throw half same roll rate rolls smoothed out Suddenly same twitchy ailerons capable producing axial rolls better knife-edge flight crisp eight point rolls Reducing up aileron also reduces down therefore produces less adverse yaw Are sealed surfaces worth trouble Yes indeed Particularly onepiece covering technique used Im convinced newer models have sealed surfaces yours dont please consider doing youll astounded D Slope/Garwood Continued page 35 steep hill 40 feet above upwind terrain flying may possible winds light 10 mph Lower hills gentler slopes likely require faster winds Its easier fly big hills because lift zone larger small hills can used favorable winds know sure try hill different wind conditions single important characteristic good slope faces wind youre lucky enough find slope faces prevailing wind area youll able fly often other end scale favorite sites hill requires northeasterly wind worksomething get about day 45 seems serious Sloper continues search good hills until hes found major point compass Its important hill have minimum trees vegetation Upwind obstructions create turbulence top Trees bushes slope face its top make tricky find good landing spot hill has road top wont have hike up down model radio tow optional its helpful enough worth February 1992 93 responding advertisers mention read about Model Aviation
Edition: Model Aviation - 1992/02
Page Numbers: 30, 31, 85, 86, 92, 93
Dr DB Mathews Flying Fun 909 N Maize Rd Townhouse 734 WIchita KS 67212 OOPS expression should never used physician dentist during procedure QOPS nonclinical setting however permissible term certaialy applies least twice recent columns So lets set record straight Cessna AW-l RCSD model pictured August 1991 column based published design Jim Adams beautiful version shown handiwork Walt Geary Absecom New Jersey Jeep thing October 1991 copy miscue certainly illustrates adage first memory goes Jeep cartoon character appeared Popeye Alley Oop surprising number readers wrote set mistake straight Seems military referred small four-wheel drive vehicle General Purpose unit abbreviate military fashion GP Obviously GIs Willys Motor altered Jeep Art Chester obviously Popeye fan calling racing aircraft names like Sweetpea Goon well Jeepall characters cartoon strip Bill Dahlgren wrote advise about another aircraft nicknamed after character Thimble Theater Popeye strip Bill says also strip portly hamburger-addicted freeloader Ill gladly pay Wednesday hamburger today named J Wellington Wimpy Combining rotund appearance both man plane name string may well explain British airmen period nicknamed Vickers Wellington bomber Wimpy rather clever multiple pun indeed Thanks Bill MA Editorial staff loved Les Long Washington State also developed neat little low-winged homebuilt named Wimpy Cant help wondering other aircraft named after cartoon strip characters Any think others EATING HUMBLE PIE Only madman someone monstrous ego would attempt develop another trainer seem suffer both maladies project has certainly deflated ego what does leave Apparently first MA July 1975 suggest Free Flight designs 1930s made excellent trainers RC added Several manufacturers have proven concept trainers designed around Old Timer parameters ie light wing loadings low power large size inherent built-in stability high-lift airfoils Unfortunately no virtue obtained some compromise Lets candid Stick strip construction used Old Timers contemporary clones inherently difficult build accurately leaves lot desired reparability after inevitable mishaps associated learning fly RC Highlift wing airfoils either undercambered true flat bottomed lend themselves well wide air speed fluctuations invariably rather twitchy windy weather Additionally light wing loadings large-ish empennages wide fuselage profiles contribute serious problems flying moderate winds Anyone has flown lightly loaded flat bottomed wing setup has become painfully aware what handful sort model can winds much over 10 mph Simply put jump wildly side side 30 Model Aviation 4tfl graae teacner pretty asTrom Built Lonnie Goad Strasburg VA plane powered y 03 2 two-stroke Junkers JU 52-3M David Stroup Mt Clemens Mi utilizes ten servos Nose engine normal throttle stick Outboards use auxilliary channel three engines OS 1 2OFS Silk dope model weighs 48 lb done original drawings Tiny Camper Swift FF Scale model pub lished old British modeling magazine Model Aircraft April 1957 Ron Warring Or Thomas Hultgren Stockholm powers Czech LD 006 cuin diesel 2/3 dis placement Cox 10 Span 18 up weight 1 oz up down maddeningly wide trim changes necessary between up wind/down-wind also time throttle speed varied Its nature flat-bottomed-airfoil beast 1983 during development original 4-40 noted although certaialy didnt look like average trainer atypical semisymmetrical airfoil fool thing wonderfully docile predictable speed wind velocity further observed perhaps apparent testing stages 4-60 1985 since advantage larger size concomitant ease visibility Both very docile flown reduced throttle trainer-like manner fact would fly nearly slowly bit much built-in stability trainers winds increased trainers would grounded 4-40 4-60 still manageable Several flying buddies made remarks like would make excellent first airplanes could convince anyone trainers would provide beginner model could grow flying skills increase Taking baithook line sinker set off what perceived simple task developing trainer utilizing airfoil moments other parameters 4-series ego got way common sense No way going turn out simple Over years Id done kit reviews various magazinessometimes under own name sometimes under pseudonym sometimes no by-line series reviews provided opportunity build fly larger sample what market considered trainer also provided chance steal lot good ideas own use didnt review trainer didnt like some course liked others urge hit design trainer own decided scientific possible set out interview instructors could asked preferences ideal trainer should configured Tricycle gear tail dragger engine size high low wing powered glider fully symmetrical flat bottom construction lots stability lots dihedral three channel four channel two channel etc etc on Like opinion surveys statistics proved useless didnt seem consensus whatsoever Beyond solid preference 40 two-cycle power rest opinions could have combined design camel concluded personal preferences good guideline likely find So set off what proved long journey Deciding discard preconceived notions about what parameters trainer ought plunged ahead what observed 4-series non-trainers drew up high wing 4-60 longer nose tail moments wing span built Six models ton changes later what Ive learned tail dragger configuration seems preferable model flown rough grass strips model easier control nose gear takes terrible beating rough grass Conversely smooth runway trike geared setup seems easier handle tiller block accessible front model buried under structure Obviously wide-set main landing gear rather robust also definite plus should mounted can sheer away rough landings removing fuselage bottom Several airfoil incidence angle/decalage setups tried arranged adjustable wind saddle prototype test various incidence settings settled fairly thin semi-symmetrical section set marked positive angle attack seems best suited good wind penetration wild swings horizontal vertical planes configuration learned semisymmetrical section set high angle attack would behave well flat section added advantage vastly superior behavior wind finally dawned semi-section much like Clark Y airfoil set way Consider Piper Cub Aeronca Champ T-craft matter have flat bottom sections modelers know underside section flat leading edge trailing edge Rather underside curves upward front 20% section February 1992 31 Malsa UA Allure Z-M giiaer witn eiecric aucica Tan IS oy uien wneemer vvIdnu, powered Astro cobalt 035 wIth six l700mA SCE pack Kens own speed contra bladed 37/i ducted fan tight-fitting shroud Power equivalent Black Widow Continued page 8S neres oi UOCS prololypes ne con cept Stolen Owen Kampens clas sic Whizard design modi fied floats rise beautifully off water Whiz 40 makes slow-speed Inverted pass Four-foot barbed wire fence back ground gives clue height Try flat-bottomed airfoil Over next few weeks company manufactured nearly 50 models christened Jammin Jets Madison Avenue advertising agency engineer technician salesman out learning fly Some novice fliers achieved durations half minutes benefit thermals improve power phase emulated delayed prop release Wakefield modifying valve water jet does start until model has launched way stored energy fully utilized Production next step tooling Since foam molding done cast aluminum cavities molds wood pattern must first fabricated surprise master patternmakers Massachusetts-based pattern shop assigned work turned out old-time modeler nice break since no problems communicating technical happy ending Concurrenfly tooling other preparation mass production another dose fun came way company agreed back sales effort childrens prime-time TV ad campaign job produce 30-second commercial same New York advertising agency dreamed up models name selected compose jingle score prepare story line Hollywood company filmed commercial location Osmond Brothers studios Provo Utah engineering group supplied models production technical support built test flew 50 models enlisted Scott Croizier Cleveland Ohio build two electrically powered RC airplanes Jammin Jet silhouette intended flybys remote filming end RC models used lot fun flying child actors no idea launch Free Flight model trained spot Most caught within hour became engrossed impromptu contests arranged filming yielded 18000 feet celluloid 3000 feet selected Accompanied captivating theme song High Can Fly 30-second commercial showed bunch kids rising sun backs flying Jammin Jet against Utah mountain horizon beautiful spectacularand successful million half models shipped next year Free Flight forever article dedicated late good friend Scott Croizier Free Flight modeler well family man professional pilot brave spirit Scott left us last yearE Flying Fun/Mathews Continued page 31 leading edge above trailing edge datum line drawn other words Clark Y section would call flat bottomed very Continued page 86 PLUG IN WINGS / ADVANCED FULL SYMETRICAL AIRFOIL / RATED FOR ALL MANEUVERS INCLUDING MAXIMUM G PULL UPS / CLEAN AERODYNAMIC DESIGN IS FAST STABLE AND EFFICIENT TM z 2 0 0 0 C 4 4 0 n Wingspan 47Area 460 sq 2 Assembly Time 6 hrs mas Lenght 42Weight 475-500 lb PRE-ASSEMBLED AND INSTALLED HAYES MOUNT NOSEGEAN 8 OZ HAYES TANK SULUVAN SKYLITE WHEELS SULLIVAN PUSHROOS CONTROL HORNS GAPLESS HINGES ALL AROUND February 1992 85 nomenclatureairfoil washout angle Jammin/Dondeincidence etc Continued page 75 COMPLETELY ASSEMBLED & FINISHED OUT OF THE BOX NO GLUE PAINT OR COVERING REQUIRED INSTALL YOUR RADIO 35-46 ENGINE AND PROP AT THE FIELD COMPUTER DESIGNED & BUILT BY MIT AEROSPACE ENGINEERS INCREDIBLE FLIGHT PERFORMANCE AND QUALITY BUILT-IN Hi-G introduces theMhUIIISUhUiI 0 VISA & MC Accepted Orders & Info 602-788-5209 H -G 2131 E Crocus Dr Phoenix AZ 85022 close phone gsPeoPIeof CameLc% M#44 %ee important difference Generous amounts downthrust combined couple degrees right thrust seemed lock models flight straight ahead regardless throttle setting also learned trim strongly affected prop diameter pitch concluded thrust offsets have tailored prop vice versa Therefore beam mounts dont quite have much easier fine tune thrust settings engine mounted firewall shims can used light strong wing about 800 in2 found ideal loading could kept 10 12 oz/ft2 range Use spruce spars sheer webs also jigs rib setting airfoil could built flat main spar trailing edge made construction rather simple Elimination cap strips sheeted leading edges certainly eliminated lot tedious work well construction technique has evolved over several years good enough being copied other designers find flattering After six prototypes several construction methods fuselage settled classic crutch construction stole Owen Kampens classic Whizard design Combining technique light ply tab-in-slot construction enables builder create fuselage unfailingly true square crutch placed upside-down over top view bulkheads sides aligned bottom added whole shebang stuck together cyanoacrylate resulting box removed cabin/wing saddle box assembled onto removable tank hatch absolute must opinion punched out crutch two temporary cutouts under wing saddle create radio compartment Only incredible klutz could build fuselage crooked Once justified stealing Kampens construction technique felt whole lot less guilty about configuring Whiz resemble much larger Whizard keeping things thin light behind wing longish front able develop fuselage unusually long moments dampen wind control induced yaw pitch requiring ballast balance help equipment installation service found extra-wide fuselage looked fine longish fuselage largest servos can mounted side side greatly simplify installation tried prototype increased dihedral no ailerons again humbled Years ago wrote product review what has become classic trainer building two matter fact ailerons other alternate high dihedral no ailerons felt three channel version superior definitely stable strong self correction recovering turns forth particular design uses very sharp entry leading edge true flat bottomed airfoil Apparently control airfoil design also incorporates 5 6 positive incidence stab set up winds however design pitched badly high dihedral caused some roll axis problems well Conversely Whiz project has proven much better moderate dihedral/aileron configuration Ailerons also add virtue being able pick up down wing gust wind hits model final So Continued page 92 ALL THREADS price $169 package 8 Use sleeves material CA will bond Six sizes #2 #4 #6 #8 #101/4 x 20 Perfect hatches cowls canopies engines servos landing gears wings anything mounts machine screw metal screw thread Uses depend imagination Color sleeve denotes size Can used thread lockers PRESS IN SLEEVE Ohio 4pere 11376 Ridgeway Road Kensington OH 44427 216-223-1950 86 Model Aviation orYS 1-800-535-2568 accept RUU ng Fun/Mathews Continued page 86 much long-held opinion ailerons dont belong trainers Configuring empennage proved enlightening experience well Vertical horizontal stab columns dictated wing area span length fuselage moments knows found volume excessive model will wind-vane badly and/or subject pitch axis problems wind Conversely too little empennage volume adversely affects stability particularly slow flight $9995 8 Ch 50 53 72 75 Mhz Dont scrap favorite AM KRAFT Heathkit Hobbyshack Royal Tower Hobbies World Engines other TRANSMITTERS SERVOS Upgrade latest AM technology proven design minisize dual conversion ultra narrow band reliability R/C REPAIRS KMI largest complete independent RIC repair center USA repair brands Send SAF complete price repair product information RCD-KMI 6 Meter EXCLUSIVE Disdaining mathematical formulas set out find trial error just much enough actually rigged prototype strap-on-stab fin tips proceeded fly various sizes learned several things tend design models enough horizontal stab shape almost important size As example tall narrow vertical stab combined dorsal fin provides turns less tendency tighten up spiral short stubby unit Dont exactly know thats what discovered Sofive years six prototypes later lots messing around modifications what did end 2-wheel gear 1 ycIe 1 7995 includes amplifier w Kraft Midwest Inc 115 E Main Northville MI 48167 313/348-0085 313/348-4175 up trainer totally different original conception As said up front ego must dealt lest get way admitting dont know Im sure know nowbut have found lots things certainly have increased fund knowledge Whiz no inherently stable other trainer know builds no easier another Ive built no sturdy repairable another isnt great deal easily maintained another Only thing single design comes awfully close matching best virtues other trainer designs package Whiz definitely easier taxi take off fly land winds above 10 mph other trainer Ive flown learning fly encountering frustrations trying coordinate instructors time time wind tremendous advantage final configuration can trimmed fly hands off transmitter ground youre brave will land itself low throttle after final approach has set up Yet throttle open hands experienced pilot Whiz can consecutive inside outside loops nice axial rolls well controlled cubans extraordinary walking speed low level inverted passes Ive ever witnessed virtues peculiar project believe Ive asked several times present programs local clubs explaining goes about designing model airplane seemed appropriate time relate readers what process can like Please note studiously avoid long-winded technical dissertations sorts fancy mathematical formulas airfoil numbers such Because franldy have never understood feel real proof model airplane design theoretical dogma plain old flying performance proof pudding eating proof design flying So think Ive developed perfect trainer No dont Considering wide variances beginners hand eye coordination reflex rates visual acuity personalities skills instructors really isnt such thing perfect trainer size fits However Whiz versatile other know am extremely proud project hope effort has worthwhile Lord knows Ill never let myself get caught ego/madness complex again CLOSING THE GAP Like almost everyone Ive known years about advantages sealed surface gaps model airplanes 92 Model Aviation 1991 KMI ULTRA AM RECEIVER y KMI RETRACTS occasion Ive sealed space between trailing edges ailerons etc Scotch magic tape attempted iron heat-shrink top heat-shrink arrangement works Ive also dissatisfied gooey mess builds up interface fuel oil creep between covering sealing tape John Walker Wichita recently built 4-120 bipe converted Ultimate look-alike sort thing first thing caught attention delivered sealed surfaces piece MonoKote After carefully looking fleet models found has doing several years Id never really noticed Maybe everyone does new John cuts section covering size area covered seals borders wing etc leaving movable surface unattached until flexes surface seals gap attaches movable surface uses heat gun shrink covering both parts Let describe covering stab order clarif First hinges installed permanently covering material tacked periphery horizontal stab including area hinge line Next elevator flexed up down depending whether top bottom being covered elevator covering pulled tight sealed borders Finally trim seal tool used seal covering gap resulting seal totally air proof stays clean important makes incredible improvement responsiveness surface also its smoothness air illustrate am third prototype 40 two-cycle sized BINGO first has very crisp roll rate second very sluggish aileron input examination consideration difference traced hinge gap first unit uses Hot Hinges second uses molded pin-type nylon units gap difference about A6 went back sealed ailerons second prototype able reduce total aileron throw half same roll rate rolls smoothed out Suddenly same twitchy ailerons capable producing axial rolls better knife-edge flight crisp eight point rolls Reducing up aileron also reduces down therefore produces less adverse yaw Are sealed surfaces worth trouble Yes indeed Particularly onepiece covering technique used Im convinced newer models have sealed surfaces yours dont please consider doing youll astounded D Slope/Garwood Continued page 35 steep hill 40 feet above upwind terrain flying may possible winds light 10 mph Lower hills gentler slopes likely require faster winds Its easier fly big hills because lift zone larger small hills can used favorable winds know sure try hill different wind conditions single important characteristic good slope faces wind youre lucky enough find slope faces prevailing wind area youll able fly often other end scale favorite sites hill requires northeasterly wind worksomething get about day 45 seems serious Sloper continues search good hills until hes found major point compass Its important hill have minimum trees vegetation Upwind obstructions create turbulence top Trees bushes slope face its top make tricky find good landing spot hill has road top wont have hike up down model radio tow optional its helpful enough worth February 1992 93 responding advertisers mention read about Model Aviation
Edition: Model Aviation - 1992/02
Page Numbers: 30, 31, 85, 86, 92, 93
Dr DB Mathews Flying Fun 909 N Maize Rd Townhouse 734 WIchita KS 67212 OOPS expression should never used physician dentist during procedure QOPS nonclinical setting however permissible term certaialy applies least twice recent columns So lets set record straight Cessna AW-l RCSD model pictured August 1991 column based published design Jim Adams beautiful version shown handiwork Walt Geary Absecom New Jersey Jeep thing October 1991 copy miscue certainly illustrates adage first memory goes Jeep cartoon character appeared Popeye Alley Oop surprising number readers wrote set mistake straight Seems military referred small four-wheel drive vehicle General Purpose unit abbreviate military fashion GP Obviously GIs Willys Motor altered Jeep Art Chester obviously Popeye fan calling racing aircraft names like Sweetpea Goon well Jeepall characters cartoon strip Bill Dahlgren wrote advise about another aircraft nicknamed after character Thimble Theater Popeye strip Bill says also strip portly hamburger-addicted freeloader Ill gladly pay Wednesday hamburger today named J Wellington Wimpy Combining rotund appearance both man plane name string may well explain British airmen period nicknamed Vickers Wellington bomber Wimpy rather clever multiple pun indeed Thanks Bill MA Editorial staff loved Les Long Washington State also developed neat little low-winged homebuilt named Wimpy Cant help wondering other aircraft named after cartoon strip characters Any think others EATING HUMBLE PIE Only madman someone monstrous ego would attempt develop another trainer seem suffer both maladies project has certainly deflated ego what does leave Apparently first MA July 1975 suggest Free Flight designs 1930s made excellent trainers RC added Several manufacturers have proven concept trainers designed around Old Timer parameters ie light wing loadings low power large size inherent built-in stability high-lift airfoils Unfortunately no virtue obtained some compromise Lets candid Stick strip construction used Old Timers contemporary clones inherently difficult build accurately leaves lot desired reparability after inevitable mishaps associated learning fly RC Highlift wing airfoils either undercambered true flat bottomed lend themselves well wide air speed fluctuations invariably rather twitchy windy weather Additionally light wing loadings large-ish empennages wide fuselage profiles contribute serious problems flying moderate winds Anyone has flown lightly loaded flat bottomed wing setup has become painfully aware what handful sort model can winds much over 10 mph Simply put jump wildly side side 30 Model Aviation 4tfl graae teacner pretty asTrom Built Lonnie Goad Strasburg VA plane powered y 03 2 two-stroke Junkers JU 52-3M David Stroup Mt Clemens Mi utilizes ten servos Nose engine normal throttle stick Outboards use auxilliary channel three engines OS 1 2OFS Silk dope model weighs 48 lb done original drawings Tiny Camper Swift FF Scale model pub lished old British modeling magazine Model Aircraft April 1957 Ron Warring Or Thomas Hultgren Stockholm powers Czech LD 006 cuin diesel 2/3 dis placement Cox 10 Span 18 up weight 1 oz up down maddeningly wide trim changes necessary between up wind/down-wind also time throttle speed varied Its nature flat-bottomed-airfoil beast 1983 during development original 4-40 noted although certaialy didnt look like average trainer atypical semisymmetrical airfoil fool thing wonderfully docile predictable speed wind velocity further observed perhaps apparent testing stages 4-60 1985 since advantage larger size concomitant ease visibility Both very docile flown reduced throttle trainer-like manner fact would fly nearly slowly bit much built-in stability trainers winds increased trainers would grounded 4-40 4-60 still manageable Several flying buddies made remarks like would make excellent first airplanes could convince anyone trainers would provide beginner model could grow flying skills increase Taking baithook line sinker set off what perceived simple task developing trainer utilizing airfoil moments other parameters 4-series ego got way common sense No way going turn out simple Over years Id done kit reviews various magazinessometimes under own name sometimes under pseudonym sometimes no by-line series reviews provided opportunity build fly larger sample what market considered trainer also provided chance steal lot good ideas own use didnt review trainer didnt like some course liked others urge hit design trainer own decided scientific possible set out interview instructors could asked preferences ideal trainer should configured Tricycle gear tail dragger engine size high low wing powered glider fully symmetrical flat bottom construction lots stability lots dihedral three channel four channel two channel etc etc on Like opinion surveys statistics proved useless didnt seem consensus whatsoever Beyond solid preference 40 two-cycle power rest opinions could have combined design camel concluded personal preferences good guideline likely find So set off what proved long journey Deciding discard preconceived notions about what parameters trainer ought plunged ahead what observed 4-series non-trainers drew up high wing 4-60 longer nose tail moments wing span built Six models ton changes later what Ive learned tail dragger configuration seems preferable model flown rough grass strips model easier control nose gear takes terrible beating rough grass Conversely smooth runway trike geared setup seems easier handle tiller block accessible front model buried under structure Obviously wide-set main landing gear rather robust also definite plus should mounted can sheer away rough landings removing fuselage bottom Several airfoil incidence angle/decalage setups tried arranged adjustable wind saddle prototype test various incidence settings settled fairly thin semi-symmetrical section set marked positive angle attack seems best suited good wind penetration wild swings horizontal vertical planes configuration learned semisymmetrical section set high angle attack would behave well flat section added advantage vastly superior behavior wind finally dawned semi-section much like Clark Y airfoil set way Consider Piper Cub Aeronca Champ T-craft matter have flat bottom sections modelers know underside section flat leading edge trailing edge Rather underside curves upward front 20% section February 1992 31 Malsa UA Allure Z-M giiaer witn eiecric aucica Tan IS oy uien wneemer vvIdnu, powered Astro cobalt 035 wIth six l700mA SCE pack Kens own speed contra bladed 37/i ducted fan tight-fitting shroud Power equivalent Black Widow Continued page 8S neres oi UOCS prololypes ne con cept Stolen Owen Kampens clas sic Whizard design modi fied floats rise beautifully off water Whiz 40 makes slow-speed Inverted pass Four-foot barbed wire fence back ground gives clue height Try flat-bottomed airfoil Over next few weeks company manufactured nearly 50 models christened Jammin Jets Madison Avenue advertising agency engineer technician salesman out learning fly Some novice fliers achieved durations half minutes benefit thermals improve power phase emulated delayed prop release Wakefield modifying valve water jet does start until model has launched way stored energy fully utilized Production next step tooling Since foam molding done cast aluminum cavities molds wood pattern must first fabricated surprise master patternmakers Massachusetts-based pattern shop assigned work turned out old-time modeler nice break since no problems communicating technical happy ending Concurrenfly tooling other preparation mass production another dose fun came way company agreed back sales effort childrens prime-time TV ad campaign job produce 30-second commercial same New York advertising agency dreamed up models name selected compose jingle score prepare story line Hollywood company filmed commercial location Osmond Brothers studios Provo Utah engineering group supplied models production technical support built test flew 50 models enlisted Scott Croizier Cleveland Ohio build two electrically powered RC airplanes Jammin Jet silhouette intended flybys remote filming end RC models used lot fun flying child actors no idea launch Free Flight model trained spot Most caught within hour became engrossed impromptu contests arranged filming yielded 18000 feet celluloid 3000 feet selected Accompanied captivating theme song High Can Fly 30-second commercial showed bunch kids rising sun backs flying Jammin Jet against Utah mountain horizon beautiful spectacularand successful million half models shipped next year Free Flight forever article dedicated late good friend Scott Croizier Free Flight modeler well family man professional pilot brave spirit Scott left us last yearE Flying Fun/Mathews Continued page 31 leading edge above trailing edge datum line drawn other words Clark Y section would call flat bottomed very Continued page 86 PLUG IN WINGS / ADVANCED FULL SYMETRICAL AIRFOIL / RATED FOR ALL MANEUVERS INCLUDING MAXIMUM G PULL UPS / CLEAN AERODYNAMIC DESIGN IS FAST STABLE AND EFFICIENT TM z 2 0 0 0 C 4 4 0 n Wingspan 47Area 460 sq 2 Assembly Time 6 hrs mas Lenght 42Weight 475-500 lb PRE-ASSEMBLED AND INSTALLED HAYES MOUNT NOSEGEAN 8 OZ HAYES TANK SULUVAN SKYLITE WHEELS SULLIVAN PUSHROOS CONTROL HORNS GAPLESS HINGES ALL AROUND February 1992 85 nomenclatureairfoil washout angle Jammin/Dondeincidence etc Continued page 75 COMPLETELY ASSEMBLED & FINISHED OUT OF THE BOX NO GLUE PAINT OR COVERING REQUIRED INSTALL YOUR RADIO 35-46 ENGINE AND PROP AT THE FIELD COMPUTER DESIGNED & BUILT BY MIT AEROSPACE ENGINEERS INCREDIBLE FLIGHT PERFORMANCE AND QUALITY BUILT-IN Hi-G introduces theMhUIIISUhUiI 0 VISA & MC Accepted Orders & Info 602-788-5209 H -G 2131 E Crocus Dr Phoenix AZ 85022 close phone gsPeoPIeof CameLc% M#44 %ee important difference Generous amounts downthrust combined couple degrees right thrust seemed lock models flight straight ahead regardless throttle setting also learned trim strongly affected prop diameter pitch concluded thrust offsets have tailored prop vice versa Therefore beam mounts dont quite have much easier fine tune thrust settings engine mounted firewall shims can used light strong wing about 800 in2 found ideal loading could kept 10 12 oz/ft2 range Use spruce spars sheer webs also jigs rib setting airfoil could built flat main spar trailing edge made construction rather simple Elimination cap strips sheeted leading edges certainly eliminated lot tedious work well construction technique has evolved over several years good enough being copied other designers find flattering After six prototypes several construction methods fuselage settled classic crutch construction stole Owen Kampens classic Whizard design Combining technique light ply tab-in-slot construction enables builder create fuselage unfailingly true square crutch placed upside-down over top view bulkheads sides aligned bottom added whole shebang stuck together cyanoacrylate resulting box removed cabin/wing saddle box assembled onto removable tank hatch absolute must opinion punched out crutch two temporary cutouts under wing saddle create radio compartment Only incredible klutz could build fuselage crooked Once justified stealing Kampens construction technique felt whole lot less guilty about configuring Whiz resemble much larger Whizard keeping things thin light behind wing longish front able develop fuselage unusually long moments dampen wind control induced yaw pitch requiring ballast balance help equipment installation service found extra-wide fuselage looked fine longish fuselage largest servos can mounted side side greatly simplify installation tried prototype increased dihedral no ailerons again humbled Years ago wrote product review what has become classic trainer building two matter fact ailerons other alternate high dihedral no ailerons felt three channel version superior definitely stable strong self correction recovering turns forth particular design uses very sharp entry leading edge true flat bottomed airfoil Apparently control airfoil design also incorporates 5 6 positive incidence stab set up winds however design pitched badly high dihedral caused some roll axis problems well Conversely Whiz project has proven much better moderate dihedral/aileron configuration Ailerons also add virtue being able pick up down wing gust wind hits model final So Continued page 92 ALL THREADS price $169 package 8 Use sleeves material CA will bond Six sizes #2 #4 #6 #8 #101/4 x 20 Perfect hatches cowls canopies engines servos landing gears wings anything mounts machine screw metal screw thread Uses depend imagination Color sleeve denotes size Can used thread lockers PRESS IN SLEEVE Ohio 4pere 11376 Ridgeway Road Kensington OH 44427 216-223-1950 86 Model Aviation orYS 1-800-535-2568 accept RUU ng Fun/Mathews Continued page 86 much long-held opinion ailerons dont belong trainers Configuring empennage proved enlightening experience well Vertical horizontal stab columns dictated wing area span length fuselage moments knows found volume excessive model will wind-vane badly and/or subject pitch axis problems wind Conversely too little empennage volume adversely affects stability particularly slow flight $9995 8 Ch 50 53 72 75 Mhz Dont scrap favorite AM KRAFT Heathkit Hobbyshack Royal Tower Hobbies World Engines other TRANSMITTERS SERVOS Upgrade latest AM technology proven design minisize dual conversion ultra narrow band reliability R/C REPAIRS KMI largest complete independent RIC repair center USA repair brands Send SAF complete price repair product information RCD-KMI 6 Meter EXCLUSIVE Disdaining mathematical formulas set out find trial error just much enough actually rigged prototype strap-on-stab fin tips proceeded fly various sizes learned several things tend design models enough horizontal stab shape almost important size As example tall narrow vertical stab combined dorsal fin provides turns less tendency tighten up spiral short stubby unit Dont exactly know thats what discovered Sofive years six prototypes later lots messing around modifications what did end 2-wheel gear 1 ycIe 1 7995 includes amplifier w Kraft Midwest Inc 115 E Main Northville MI 48167 313/348-0085 313/348-4175 up trainer totally different original conception As said up front ego must dealt lest get way admitting dont know Im sure know nowbut have found lots things certainly have increased fund knowledge Whiz no inherently stable other trainer know builds no easier another Ive built no sturdy repairable another isnt great deal easily maintained another Only thing single design comes awfully close matching best virtues other trainer designs package Whiz definitely easier taxi take off fly land winds above 10 mph other trainer Ive flown learning fly encountering frustrations trying coordinate instructors time time wind tremendous advantage final configuration can trimmed fly hands off transmitter ground youre brave will land itself low throttle after final approach has set up Yet throttle open hands experienced pilot Whiz can consecutive inside outside loops nice axial rolls well controlled cubans extraordinary walking speed low level inverted passes Ive ever witnessed virtues peculiar project believe Ive asked several times present programs local clubs explaining goes about designing model airplane seemed appropriate time relate readers what process can like Please note studiously avoid long-winded technical dissertations sorts fancy mathematical formulas airfoil numbers such Because franldy have never understood feel real proof model airplane design theoretical dogma plain old flying performance proof pudding eating proof design flying So think Ive developed perfect trainer No dont Considering wide variances beginners hand eye coordination reflex rates visual acuity personalities skills instructors really isnt such thing perfect trainer size fits However Whiz versatile other know am extremely proud project hope effort has worthwhile Lord knows Ill never let myself get caught ego/madness complex again CLOSING THE GAP Like almost everyone Ive known years about advantages sealed surface gaps model airplanes 92 Model Aviation 1991 KMI ULTRA AM RECEIVER y KMI RETRACTS occasion Ive sealed space between trailing edges ailerons etc Scotch magic tape attempted iron heat-shrink top heat-shrink arrangement works Ive also dissatisfied gooey mess builds up interface fuel oil creep between covering sealing tape John Walker Wichita recently built 4-120 bipe converted Ultimate look-alike sort thing first thing caught attention delivered sealed surfaces piece MonoKote After carefully looking fleet models found has doing several years Id never really noticed Maybe everyone does new John cuts section covering size area covered seals borders wing etc leaving movable surface unattached until flexes surface seals gap attaches movable surface uses heat gun shrink covering both parts Let describe covering stab order clarif First hinges installed permanently covering material tacked periphery horizontal stab including area hinge line Next elevator flexed up down depending whether top bottom being covered elevator covering pulled tight sealed borders Finally trim seal tool used seal covering gap resulting seal totally air proof stays clean important makes incredible improvement responsiveness surface also its smoothness air illustrate am third prototype 40 two-cycle sized BINGO first has very crisp roll rate second very sluggish aileron input examination consideration difference traced hinge gap first unit uses Hot Hinges second uses molded pin-type nylon units gap difference about A6 went back sealed ailerons second prototype able reduce total aileron throw half same roll rate rolls smoothed out Suddenly same twitchy ailerons capable producing axial rolls better knife-edge flight crisp eight point rolls Reducing up aileron also reduces down therefore produces less adverse yaw Are sealed surfaces worth trouble Yes indeed Particularly onepiece covering technique used Im convinced newer models have sealed surfaces yours dont please consider doing youll astounded D Slope/Garwood Continued page 35 steep hill 40 feet above upwind terrain flying may possible winds light 10 mph Lower hills gentler slopes likely require faster winds Its easier fly big hills because lift zone larger small hills can used favorable winds know sure try hill different wind conditions single important characteristic good slope faces wind youre lucky enough find slope faces prevailing wind area youll able fly often other end scale favorite sites hill requires northeasterly wind worksomething get about day 45 seems serious Sloper continues search good hills until hes found major point compass Its important hill have minimum trees vegetation Upwind obstructions create turbulence top Trees bushes slope face its top make tricky find good landing spot hill has road top wont have hike up down model radio tow optional its helpful enough worth February 1992 93 responding advertisers mention read about Model Aviation
Edition: Model Aviation - 1992/02
Page Numbers: 30, 31, 85, 86, 92, 93
Dr DB Mathews Flying Fun 909 N Maize Rd Townhouse 734 WIchita KS 67212 OOPS expression should never used physician dentist during procedure QOPS nonclinical setting however permissible term certaialy applies least twice recent columns So lets set record straight Cessna AW-l RCSD model pictured August 1991 column based published design Jim Adams beautiful version shown handiwork Walt Geary Absecom New Jersey Jeep thing October 1991 copy miscue certainly illustrates adage first memory goes Jeep cartoon character appeared Popeye Alley Oop surprising number readers wrote set mistake straight Seems military referred small four-wheel drive vehicle General Purpose unit abbreviate military fashion GP Obviously GIs Willys Motor altered Jeep Art Chester obviously Popeye fan calling racing aircraft names like Sweetpea Goon well Jeepall characters cartoon strip Bill Dahlgren wrote advise about another aircraft nicknamed after character Thimble Theater Popeye strip Bill says also strip portly hamburger-addicted freeloader Ill gladly pay Wednesday hamburger today named J Wellington Wimpy Combining rotund appearance both man plane name string may well explain British airmen period nicknamed Vickers Wellington bomber Wimpy rather clever multiple pun indeed Thanks Bill MA Editorial staff loved Les Long Washington State also developed neat little low-winged homebuilt named Wimpy Cant help wondering other aircraft named after cartoon strip characters Any think others EATING HUMBLE PIE Only madman someone monstrous ego would attempt develop another trainer seem suffer both maladies project has certainly deflated ego what does leave Apparently first MA July 1975 suggest Free Flight designs 1930s made excellent trainers RC added Several manufacturers have proven concept trainers designed around Old Timer parameters ie light wing loadings low power large size inherent built-in stability high-lift airfoils Unfortunately no virtue obtained some compromise Lets candid Stick strip construction used Old Timers contemporary clones inherently difficult build accurately leaves lot desired reparability after inevitable mishaps associated learning fly RC Highlift wing airfoils either undercambered true flat bottomed lend themselves well wide air speed fluctuations invariably rather twitchy windy weather Additionally light wing loadings large-ish empennages wide fuselage profiles contribute serious problems flying moderate winds Anyone has flown lightly loaded flat bottomed wing setup has become painfully aware what handful sort model can winds much over 10 mph Simply put jump wildly side side 30 Model Aviation 4tfl graae teacner pretty asTrom Built Lonnie Goad Strasburg VA plane powered y 03 2 two-stroke Junkers JU 52-3M David Stroup Mt Clemens Mi utilizes ten servos Nose engine normal throttle stick Outboards use auxilliary channel three engines OS 1 2OFS Silk dope model weighs 48 lb done original drawings Tiny Camper Swift FF Scale model pub lished old British modeling magazine Model Aircraft April 1957 Ron Warring Or Thomas Hultgren Stockholm powers Czech LD 006 cuin diesel 2/3 dis placement Cox 10 Span 18 up weight 1 oz up down maddeningly wide trim changes necessary between up wind/down-wind also time throttle speed varied Its nature flat-bottomed-airfoil beast 1983 during development original 4-40 noted although certaialy didnt look like average trainer atypical semisymmetrical airfoil fool thing wonderfully docile predictable speed wind velocity further observed perhaps apparent testing stages 4-60 1985 since advantage larger size concomitant ease visibility Both very docile flown reduced throttle trainer-like manner fact would fly nearly slowly bit much built-in stability trainers winds increased trainers would grounded 4-40 4-60 still manageable Several flying buddies made remarks like would make excellent first airplanes could convince anyone trainers would provide beginner model could grow flying skills increase Taking baithook line sinker set off what perceived simple task developing trainer utilizing airfoil moments other parameters 4-series ego got way common sense No way going turn out simple Over years Id done kit reviews various magazinessometimes under own name sometimes under pseudonym sometimes no by-line series reviews provided opportunity build fly larger sample what market considered trainer also provided chance steal lot good ideas own use didnt review trainer didnt like some course liked others urge hit design trainer own decided scientific possible set out interview instructors could asked preferences ideal trainer should configured Tricycle gear tail dragger engine size high low wing powered glider fully symmetrical flat bottom construction lots stability lots dihedral three channel four channel two channel etc etc on Like opinion surveys statistics proved useless didnt seem consensus whatsoever Beyond solid preference 40 two-cycle power rest opinions could have combined design camel concluded personal preferences good guideline likely find So set off what proved long journey Deciding discard preconceived notions about what parameters trainer ought plunged ahead what observed 4-series non-trainers drew up high wing 4-60 longer nose tail moments wing span built Six models ton changes later what Ive learned tail dragger configuration seems preferable model flown rough grass strips model easier control nose gear takes terrible beating rough grass Conversely smooth runway trike geared setup seems easier handle tiller block accessible front model buried under structure Obviously wide-set main landing gear rather robust also definite plus should mounted can sheer away rough landings removing fuselage bottom Several airfoil incidence angle/decalage setups tried arranged adjustable wind saddle prototype test various incidence settings settled fairly thin semi-symmetrical section set marked positive angle attack seems best suited good wind penetration wild swings horizontal vertical planes configuration learned semisymmetrical section set high angle attack would behave well flat section added advantage vastly superior behavior wind finally dawned semi-section much like Clark Y airfoil set way Consider Piper Cub Aeronca Champ T-craft matter have flat bottom sections modelers know underside section flat leading edge trailing edge Rather underside curves upward front 20% section February 1992 31 Malsa UA Allure Z-M giiaer witn eiecric aucica Tan IS oy uien wneemer vvIdnu, powered Astro cobalt 035 wIth six l700mA SCE pack Kens own speed contra bladed 37/i ducted fan tight-fitting shroud Power equivalent Black Widow Continued page 8S neres oi UOCS prololypes ne con cept Stolen Owen Kampens clas sic Whizard design modi fied floats rise beautifully off water Whiz 40 makes slow-speed Inverted pass Four-foot barbed wire fence back ground gives clue height Try flat-bottomed airfoil Over next few weeks company manufactured nearly 50 models christened Jammin Jets Madison Avenue advertising agency engineer technician salesman out learning fly Some novice fliers achieved durations half minutes benefit thermals improve power phase emulated delayed prop release Wakefield modifying valve water jet does start until model has launched way stored energy fully utilized Production next step tooling Since foam molding done cast aluminum cavities molds wood pattern must first fabricated surprise master patternmakers Massachusetts-based pattern shop assigned work turned out old-time modeler nice break since no problems communicating technical happy ending Concurrenfly tooling other preparation mass production another dose fun came way company agreed back sales effort childrens prime-time TV ad campaign job produce 30-second commercial same New York advertising agency dreamed up models name selected compose jingle score prepare story line Hollywood company filmed commercial location Osmond Brothers studios Provo Utah engineering group supplied models production technical support built test flew 50 models enlisted Scott Croizier Cleveland Ohio build two electrically powered RC airplanes Jammin Jet silhouette intended flybys remote filming end RC models used lot fun flying child actors no idea launch Free Flight model trained spot Most caught within hour became engrossed impromptu contests arranged filming yielded 18000 feet celluloid 3000 feet selected Accompanied captivating theme song High Can Fly 30-second commercial showed bunch kids rising sun backs flying Jammin Jet against Utah mountain horizon beautiful spectacularand successful million half models shipped next year Free Flight forever article dedicated late good friend Scott Croizier Free Flight modeler well family man professional pilot brave spirit Scott left us last yearE Flying Fun/Mathews Continued page 31 leading edge above trailing edge datum line drawn other words Clark Y section would call flat bottomed very Continued page 86 PLUG IN WINGS / ADVANCED FULL SYMETRICAL AIRFOIL / RATED FOR ALL MANEUVERS INCLUDING MAXIMUM G PULL UPS / CLEAN AERODYNAMIC DESIGN IS FAST STABLE AND EFFICIENT TM z 2 0 0 0 C 4 4 0 n Wingspan 47Area 460 sq 2 Assembly Time 6 hrs mas Lenght 42Weight 475-500 lb PRE-ASSEMBLED AND INSTALLED HAYES MOUNT NOSEGEAN 8 OZ HAYES TANK SULUVAN SKYLITE WHEELS SULLIVAN PUSHROOS CONTROL HORNS GAPLESS HINGES ALL AROUND February 1992 85 nomenclatureairfoil washout angle Jammin/Dondeincidence etc Continued page 75 COMPLETELY ASSEMBLED & FINISHED OUT OF THE BOX NO GLUE PAINT OR COVERING REQUIRED INSTALL YOUR RADIO 35-46 ENGINE AND PROP AT THE FIELD COMPUTER DESIGNED & BUILT BY MIT AEROSPACE ENGINEERS INCREDIBLE FLIGHT PERFORMANCE AND QUALITY BUILT-IN Hi-G introduces theMhUIIISUhUiI 0 VISA & MC Accepted Orders & Info 602-788-5209 H -G 2131 E Crocus Dr Phoenix AZ 85022 close phone gsPeoPIeof CameLc% M#44 %ee important difference Generous amounts downthrust combined couple degrees right thrust seemed lock models flight straight ahead regardless throttle setting also learned trim strongly affected prop diameter pitch concluded thrust offsets have tailored prop vice versa Therefore beam mounts dont quite have much easier fine tune thrust settings engine mounted firewall shims can used light strong wing about 800 in2 found ideal loading could kept 10 12 oz/ft2 range Use spruce spars sheer webs also jigs rib setting airfoil could built flat main spar trailing edge made construction rather simple Elimination cap strips sheeted leading edges certainly eliminated lot tedious work well construction technique has evolved over several years good enough being copied other designers find flattering After six prototypes several construction methods fuselage settled classic crutch construction stole Owen Kampens classic Whizard design Combining technique light ply tab-in-slot construction enables builder create fuselage unfailingly true square crutch placed upside-down over top view bulkheads sides aligned bottom added whole shebang stuck together cyanoacrylate resulting box removed cabin/wing saddle box assembled onto removable tank hatch absolute must opinion punched out crutch two temporary cutouts under wing saddle create radio compartment Only incredible klutz could build fuselage crooked Once justified stealing Kampens construction technique felt whole lot less guilty about configuring Whiz resemble much larger Whizard keeping things thin light behind wing longish front able develop fuselage unusually long moments dampen wind control induced yaw pitch requiring ballast balance help equipment installation service found extra-wide fuselage looked fine longish fuselage largest servos can mounted side side greatly simplify installation tried prototype increased dihedral no ailerons again humbled Years ago wrote product review what has become classic trainer building two matter fact ailerons other alternate high dihedral no ailerons felt three channel version superior definitely stable strong self correction recovering turns forth particular design uses very sharp entry leading edge true flat bottomed airfoil Apparently control airfoil design also incorporates 5 6 positive incidence stab set up winds however design pitched badly high dihedral caused some roll axis problems well Conversely Whiz project has proven much better moderate dihedral/aileron configuration Ailerons also add virtue being able pick up down wing gust wind hits model final So Continued page 92 ALL THREADS price $169 package 8 Use sleeves material CA will bond Six sizes #2 #4 #6 #8 #101/4 x 20 Perfect hatches cowls canopies engines servos landing gears wings anything mounts machine screw metal screw thread Uses depend imagination Color sleeve denotes size Can used thread lockers PRESS IN SLEEVE Ohio 4pere 11376 Ridgeway Road Kensington OH 44427 216-223-1950 86 Model Aviation orYS 1-800-535-2568 accept RUU ng Fun/Mathews Continued page 86 much long-held opinion ailerons dont belong trainers Configuring empennage proved enlightening experience well Vertical horizontal stab columns dictated wing area span length fuselage moments knows found volume excessive model will wind-vane badly and/or subject pitch axis problems wind Conversely too little empennage volume adversely affects stability particularly slow flight $9995 8 Ch 50 53 72 75 Mhz Dont scrap favorite AM KRAFT Heathkit Hobbyshack Royal Tower Hobbies World Engines other TRANSMITTERS SERVOS Upgrade latest AM technology proven design minisize dual conversion ultra narrow band reliability R/C REPAIRS KMI largest complete independent RIC repair center USA repair brands Send SAF complete price repair product information RCD-KMI 6 Meter EXCLUSIVE Disdaining mathematical formulas set out find trial error just much enough actually rigged prototype strap-on-stab fin tips proceeded fly various sizes learned several things tend design models enough horizontal stab shape almost important size As example tall narrow vertical stab combined dorsal fin provides turns less tendency tighten up spiral short stubby unit Dont exactly know thats what discovered Sofive years six prototypes later lots messing around modifications what did end 2-wheel gear 1 ycIe 1 7995 includes amplifier w Kraft Midwest Inc 115 E Main Northville MI 48167 313/348-0085 313/348-4175 up trainer totally different original conception As said up front ego must dealt lest get way admitting dont know Im sure know nowbut have found lots things certainly have increased fund knowledge Whiz no inherently stable other trainer know builds no easier another Ive built no sturdy repairable another isnt great deal easily maintained another Only thing single design comes awfully close matching best virtues other trainer designs package Whiz definitely easier taxi take off fly land winds above 10 mph other trainer Ive flown learning fly encountering frustrations trying coordinate instructors time time wind tremendous advantage final configuration can trimmed fly hands off transmitter ground youre brave will land itself low throttle after final approach has set up Yet throttle open hands experienced pilot Whiz can consecutive inside outside loops nice axial rolls well controlled cubans extraordinary walking speed low level inverted passes Ive ever witnessed virtues peculiar project believe Ive asked several times present programs local clubs explaining goes about designing model airplane seemed appropriate time relate readers what process can like Please note studiously avoid long-winded technical dissertations sorts fancy mathematical formulas airfoil numbers such Because franldy have never understood feel real proof model airplane design theoretical dogma plain old flying performance proof pudding eating proof design flying So think Ive developed perfect trainer No dont Considering wide variances beginners hand eye coordination reflex rates visual acuity personalities skills instructors really isnt such thing perfect trainer size fits However Whiz versatile other know am extremely proud project hope effort has worthwhile Lord knows Ill never let myself get caught ego/madness complex again CLOSING THE GAP Like almost everyone Ive known years about advantages sealed surface gaps model airplanes 92 Model Aviation 1991 KMI ULTRA AM RECEIVER y KMI RETRACTS occasion Ive sealed space between trailing edges ailerons etc Scotch magic tape attempted iron heat-shrink top heat-shrink arrangement works Ive also dissatisfied gooey mess builds up interface fuel oil creep between covering sealing tape John Walker Wichita recently built 4-120 bipe converted Ultimate look-alike sort thing first thing caught attention delivered sealed surfaces piece MonoKote After carefully looking fleet models found has doing several years Id never really noticed Maybe everyone does new John cuts section covering size area covered seals borders wing etc leaving movable surface unattached until flexes surface seals gap attaches movable surface uses heat gun shrink covering both parts Let describe covering stab order clarif First hinges installed permanently covering material tacked periphery horizontal stab including area hinge line Next elevator flexed up down depending whether top bottom being covered elevator covering pulled tight sealed borders Finally trim seal tool used seal covering gap resulting seal totally air proof stays clean important makes incredible improvement responsiveness surface also its smoothness air illustrate am third prototype 40 two-cycle sized BINGO first has very crisp roll rate second very sluggish aileron input examination consideration difference traced hinge gap first unit uses Hot Hinges second uses molded pin-type nylon units gap difference about A6 went back sealed ailerons second prototype able reduce total aileron throw half same roll rate rolls smoothed out Suddenly same twitchy ailerons capable producing axial rolls better knife-edge flight crisp eight point rolls Reducing up aileron also reduces down therefore produces less adverse yaw Are sealed surfaces worth trouble Yes indeed Particularly onepiece covering technique used Im convinced newer models have sealed surfaces yours dont please consider doing youll astounded D Slope/Garwood Continued page 35 steep hill 40 feet above upwind terrain flying may possible winds light 10 mph Lower hills gentler slopes likely require faster winds Its easier fly big hills because lift zone larger small hills can used favorable winds know sure try hill different wind conditions single important characteristic good slope faces wind youre lucky enough find slope faces prevailing wind area youll able fly often other end scale favorite sites hill requires northeasterly wind worksomething get about day 45 seems serious Sloper continues search good hills until hes found major point compass Its important hill have minimum trees vegetation Upwind obstructions create turbulence top Trees bushes slope face its top make tricky find good landing spot hill has road top wont have hike up down model radio tow optional its helpful enough worth February 1992 93 responding advertisers mention read about Model Aviation
Edition: Model Aviation - 1992/02
Page Numbers: 30, 31, 85, 86, 92, 93
Dr DB Mathews Flying Fun 909 N Maize Rd Townhouse 734 WIchita KS 67212 OOPS expression should never used physician dentist during procedure QOPS nonclinical setting however permissible term certaialy applies least twice recent columns So lets set record straight Cessna AW-l RCSD model pictured August 1991 column based published design Jim Adams beautiful version shown handiwork Walt Geary Absecom New Jersey Jeep thing October 1991 copy miscue certainly illustrates adage first memory goes Jeep cartoon character appeared Popeye Alley Oop surprising number readers wrote set mistake straight Seems military referred small four-wheel drive vehicle General Purpose unit abbreviate military fashion GP Obviously GIs Willys Motor altered Jeep Art Chester obviously Popeye fan calling racing aircraft names like Sweetpea Goon well Jeepall characters cartoon strip Bill Dahlgren wrote advise about another aircraft nicknamed after character Thimble Theater Popeye strip Bill says also strip portly hamburger-addicted freeloader Ill gladly pay Wednesday hamburger today named J Wellington Wimpy Combining rotund appearance both man plane name string may well explain British airmen period nicknamed Vickers Wellington bomber Wimpy rather clever multiple pun indeed Thanks Bill MA Editorial staff loved Les Long Washington State also developed neat little low-winged homebuilt named Wimpy Cant help wondering other aircraft named after cartoon strip characters Any think others EATING HUMBLE PIE Only madman someone monstrous ego would attempt develop another trainer seem suffer both maladies project has certainly deflated ego what does leave Apparently first MA July 1975 suggest Free Flight designs 1930s made excellent trainers RC added Several manufacturers have proven concept trainers designed around Old Timer parameters ie light wing loadings low power large size inherent built-in stability high-lift airfoils Unfortunately no virtue obtained some compromise Lets candid Stick strip construction used Old Timers contemporary clones inherently difficult build accurately leaves lot desired reparability after inevitable mishaps associated learning fly RC Highlift wing airfoils either undercambered true flat bottomed lend themselves well wide air speed fluctuations invariably rather twitchy windy weather Additionally light wing loadings large-ish empennages wide fuselage profiles contribute serious problems flying moderate winds Anyone has flown lightly loaded flat bottomed wing setup has become painfully aware what handful sort model can winds much over 10 mph Simply put jump wildly side side 30 Model Aviation 4tfl graae teacner pretty asTrom Built Lonnie Goad Strasburg VA plane powered y 03 2 two-stroke Junkers JU 52-3M David Stroup Mt Clemens Mi utilizes ten servos Nose engine normal throttle stick Outboards use auxilliary channel three engines OS 1 2OFS Silk dope model weighs 48 lb done original drawings Tiny Camper Swift FF Scale model pub lished old British modeling magazine Model Aircraft April 1957 Ron Warring Or Thomas Hultgren Stockholm powers Czech LD 006 cuin diesel 2/3 dis placement Cox 10 Span 18 up weight 1 oz up down maddeningly wide trim changes necessary between up wind/down-wind also time throttle speed varied Its nature flat-bottomed-airfoil beast 1983 during development original 4-40 noted although certaialy didnt look like average trainer atypical semisymmetrical airfoil fool thing wonderfully docile predictable speed wind velocity further observed perhaps apparent testing stages 4-60 1985 since advantage larger size concomitant ease visibility Both very docile flown reduced throttle trainer-like manner fact would fly nearly slowly bit much built-in stability trainers winds increased trainers would grounded 4-40 4-60 still manageable Several flying buddies made remarks like would make excellent first airplanes could convince anyone trainers would provide beginner model could grow flying skills increase Taking baithook line sinker set off what perceived simple task developing trainer utilizing airfoil moments other parameters 4-series ego got way common sense No way going turn out simple Over years Id done kit reviews various magazinessometimes under own name sometimes under pseudonym sometimes no by-line series reviews provided opportunity build fly larger sample what market considered trainer also provided chance steal lot good ideas own use didnt review trainer didnt like some course liked others urge hit design trainer own decided scientific possible set out interview instructors could asked preferences ideal trainer should configured Tricycle gear tail dragger engine size high low wing powered glider fully symmetrical flat bottom construction lots stability lots dihedral three channel four channel two channel etc etc on Like opinion surveys statistics proved useless didnt seem consensus whatsoever Beyond solid preference 40 two-cycle power rest opinions could have combined design camel concluded personal preferences good guideline likely find So set off what proved long journey Deciding discard preconceived notions about what parameters trainer ought plunged ahead what observed 4-series non-trainers drew up high wing 4-60 longer nose tail moments wing span built Six models ton changes later what Ive learned tail dragger configuration seems preferable model flown rough grass strips model easier control nose gear takes terrible beating rough grass Conversely smooth runway trike geared setup seems easier handle tiller block accessible front model buried under structure Obviously wide-set main landing gear rather robust also definite plus should mounted can sheer away rough landings removing fuselage bottom Several airfoil incidence angle/decalage setups tried arranged adjustable wind saddle prototype test various incidence settings settled fairly thin semi-symmetrical section set marked positive angle attack seems best suited good wind penetration wild swings horizontal vertical planes configuration learned semisymmetrical section set high angle attack would behave well flat section added advantage vastly superior behavior wind finally dawned semi-section much like Clark Y airfoil set way Consider Piper Cub Aeronca Champ T-craft matter have flat bottom sections modelers know underside section flat leading edge trailing edge Rather underside curves upward front 20% section February 1992 31 Malsa UA Allure Z-M giiaer witn eiecric aucica Tan IS oy uien wneemer vvIdnu, powered Astro cobalt 035 wIth six l700mA SCE pack Kens own speed contra bladed 37/i ducted fan tight-fitting shroud Power equivalent Black Widow Continued page 8S neres oi UOCS prololypes ne con cept Stolen Owen Kampens clas sic Whizard design modi fied floats rise beautifully off water Whiz 40 makes slow-speed Inverted pass Four-foot barbed wire fence back ground gives clue height Try flat-bottomed airfoil Over next few weeks company manufactured nearly 50 models christened Jammin Jets Madison Avenue advertising agency engineer technician salesman out learning fly Some novice fliers achieved durations half minutes benefit thermals improve power phase emulated delayed prop release Wakefield modifying valve water jet does start until model has launched way stored energy fully utilized Production next step tooling Since foam molding done cast aluminum cavities molds wood pattern must first fabricated surprise master patternmakers Massachusetts-based pattern shop assigned work turned out old-time modeler nice break since no problems communicating technical happy ending Concurrenfly tooling other preparation mass production another dose fun came way company agreed back sales effort childrens prime-time TV ad campaign job produce 30-second commercial same New York advertising agency dreamed up models name selected compose jingle score prepare story line Hollywood company filmed commercial location Osmond Brothers studios Provo Utah engineering group supplied models production technical support built test flew 50 models enlisted Scott Croizier Cleveland Ohio build two electrically powered RC airplanes Jammin Jet silhouette intended flybys remote filming end RC models used lot fun flying child actors no idea launch Free Flight model trained spot Most caught within hour became engrossed impromptu contests arranged filming yielded 18000 feet celluloid 3000 feet selected Accompanied captivating theme song High Can Fly 30-second commercial showed bunch kids rising sun backs flying Jammin Jet against Utah mountain horizon beautiful spectacularand successful million half models shipped next year Free Flight forever article dedicated late good friend Scott Croizier Free Flight modeler well family man professional pilot brave spirit Scott left us last yearE Flying Fun/Mathews Continued page 31 leading edge above trailing edge datum line drawn other words Clark Y section would call flat bottomed very Continued page 86 PLUG IN WINGS / ADVANCED FULL SYMETRICAL AIRFOIL / RATED FOR ALL MANEUVERS INCLUDING MAXIMUM G PULL UPS / CLEAN AERODYNAMIC DESIGN IS FAST STABLE AND EFFICIENT TM z 2 0 0 0 C 4 4 0 n Wingspan 47Area 460 sq 2 Assembly Time 6 hrs mas Lenght 42Weight 475-500 lb PRE-ASSEMBLED AND INSTALLED HAYES MOUNT NOSEGEAN 8 OZ HAYES TANK SULUVAN SKYLITE WHEELS SULLIVAN PUSHROOS CONTROL HORNS GAPLESS HINGES ALL AROUND February 1992 85 nomenclatureairfoil washout angle Jammin/Dondeincidence etc Continued page 75 COMPLETELY ASSEMBLED & FINISHED OUT OF THE BOX NO GLUE PAINT OR COVERING REQUIRED INSTALL YOUR RADIO 35-46 ENGINE AND PROP AT THE FIELD COMPUTER DESIGNED & BUILT BY MIT AEROSPACE ENGINEERS INCREDIBLE FLIGHT PERFORMANCE AND QUALITY BUILT-IN Hi-G introduces theMhUIIISUhUiI 0 VISA & MC Accepted Orders & Info 602-788-5209 H -G 2131 E Crocus Dr Phoenix AZ 85022 close phone gsPeoPIeof CameLc% M#44 %ee important difference Generous amounts downthrust combined couple degrees right thrust seemed lock models flight straight ahead regardless throttle setting also learned trim strongly affected prop diameter pitch concluded thrust offsets have tailored prop vice versa Therefore beam mounts dont quite have much easier fine tune thrust settings engine mounted firewall shims can used light strong wing about 800 in2 found ideal loading could kept 10 12 oz/ft2 range Use spruce spars sheer webs also jigs rib setting airfoil could built flat main spar trailing edge made construction rather simple Elimination cap strips sheeted leading edges certainly eliminated lot tedious work well construction technique has evolved over several years good enough being copied other designers find flattering After six prototypes several construction methods fuselage settled classic crutch construction stole Owen Kampens classic Whizard design Combining technique light ply tab-in-slot construction enables builder create fuselage unfailingly true square crutch placed upside-down over top view bulkheads sides aligned bottom added whole shebang stuck together cyanoacrylate resulting box removed cabin/wing saddle box assembled onto removable tank hatch absolute must opinion punched out crutch two temporary cutouts under wing saddle create radio compartment Only incredible klutz could build fuselage crooked Once justified stealing Kampens construction technique felt whole lot less guilty about configuring Whiz resemble much larger Whizard keeping things thin light behind wing longish front able develop fuselage unusually long moments dampen wind control induced yaw pitch requiring ballast balance help equipment installation service found extra-wide fuselage looked fine longish fuselage largest servos can mounted side side greatly simplify installation tried prototype increased dihedral no ailerons again humbled Years ago wrote product review what has become classic trainer building two matter fact ailerons other alternate high dihedral no ailerons felt three channel version superior definitely stable strong self correction recovering turns forth particular design uses very sharp entry leading edge true flat bottomed airfoil Apparently control airfoil design also incorporates 5 6 positive incidence stab set up winds however design pitched badly high dihedral caused some roll axis problems well Conversely Whiz project has proven much better moderate dihedral/aileron configuration Ailerons also add virtue being able pick up down wing gust wind hits model final So Continued page 92 ALL THREADS price $169 package 8 Use sleeves material CA will bond Six sizes #2 #4 #6 #8 #101/4 x 20 Perfect hatches cowls canopies engines servos landing gears wings anything mounts machine screw metal screw thread Uses depend imagination Color sleeve denotes size Can used thread lockers PRESS IN SLEEVE Ohio 4pere 11376 Ridgeway Road Kensington OH 44427 216-223-1950 86 Model Aviation orYS 1-800-535-2568 accept RUU ng Fun/Mathews Continued page 86 much long-held opinion ailerons dont belong trainers Configuring empennage proved enlightening experience well Vertical horizontal stab columns dictated wing area span length fuselage moments knows found volume excessive model will wind-vane badly and/or subject pitch axis problems wind Conversely too little empennage volume adversely affects stability particularly slow flight $9995 8 Ch 50 53 72 75 Mhz Dont scrap favorite AM KRAFT Heathkit Hobbyshack Royal Tower Hobbies World Engines other TRANSMITTERS SERVOS Upgrade latest AM technology proven design minisize dual conversion ultra narrow band reliability R/C REPAIRS KMI largest complete independent RIC repair center USA repair brands Send SAF complete price repair product information RCD-KMI 6 Meter EXCLUSIVE Disdaining mathematical formulas set out find trial error just much enough actually rigged prototype strap-on-stab fin tips proceeded fly various sizes learned several things tend design models enough horizontal stab shape almost important size As example tall narrow vertical stab combined dorsal fin provides turns less tendency tighten up spiral short stubby unit Dont exactly know thats what discovered Sofive years six prototypes later lots messing around modifications what did end 2-wheel gear 1 ycIe 1 7995 includes amplifier w Kraft Midwest Inc 115 E Main Northville MI 48167 313/348-0085 313/348-4175 up trainer totally different original conception As said up front ego must dealt lest get way admitting dont know Im sure know nowbut have found lots things certainly have increased fund knowledge Whiz no inherently stable other trainer know builds no easier another Ive built no sturdy repairable another isnt great deal easily maintained another Only thing single design comes awfully close matching best virtues other trainer designs package Whiz definitely easier taxi take off fly land winds above 10 mph other trainer Ive flown learning fly encountering frustrations trying coordinate instructors time time wind tremendous advantage final configuration can trimmed fly hands off transmitter ground youre brave will land itself low throttle after final approach has set up Yet throttle open hands experienced pilot Whiz can consecutive inside outside loops nice axial rolls well controlled cubans extraordinary walking speed low level inverted passes Ive ever witnessed virtues peculiar project believe Ive asked several times present programs local clubs explaining goes about designing model airplane seemed appropriate time relate readers what process can like Please note studiously avoid long-winded technical dissertations sorts fancy mathematical formulas airfoil numbers such Because franldy have never understood feel real proof model airplane design theoretical dogma plain old flying performance proof pudding eating proof design flying So think Ive developed perfect trainer No dont Considering wide variances beginners hand eye coordination reflex rates visual acuity personalities skills instructors really isnt such thing perfect trainer size fits However Whiz versatile other know am extremely proud project hope effort has worthwhile Lord knows Ill never let myself get caught ego/madness complex again CLOSING THE GAP Like almost everyone Ive known years about advantages sealed surface gaps model airplanes 92 Model Aviation 1991 KMI ULTRA AM RECEIVER y KMI RETRACTS occasion Ive sealed space between trailing edges ailerons etc Scotch magic tape attempted iron heat-shrink top heat-shrink arrangement works Ive also dissatisfied gooey mess builds up interface fuel oil creep between covering sealing tape John Walker Wichita recently built 4-120 bipe converted Ultimate look-alike sort thing first thing caught attention delivered sealed surfaces piece MonoKote After carefully looking fleet models found has doing several years Id never really noticed Maybe everyone does new John cuts section covering size area covered seals borders wing etc leaving movable surface unattached until flexes surface seals gap attaches movable surface uses heat gun shrink covering both parts Let describe covering stab order clarif First hinges installed permanently covering material tacked periphery horizontal stab including area hinge line Next elevator flexed up down depending whether top bottom being covered elevator covering pulled tight sealed borders Finally trim seal tool used seal covering gap resulting seal totally air proof stays clean important makes incredible improvement responsiveness surface also its smoothness air illustrate am third prototype 40 two-cycle sized BINGO first has very crisp roll rate second very sluggish aileron input examination consideration difference traced hinge gap first unit uses Hot Hinges second uses molded pin-type nylon units gap difference about A6 went back sealed ailerons second prototype able reduce total aileron throw half same roll rate rolls smoothed out Suddenly same twitchy ailerons capable producing axial rolls better knife-edge flight crisp eight point rolls Reducing up aileron also reduces down therefore produces less adverse yaw Are sealed surfaces worth trouble Yes indeed Particularly onepiece covering technique used Im convinced newer models have sealed surfaces yours dont please consider doing youll astounded D Slope/Garwood Continued page 35 steep hill 40 feet above upwind terrain flying may possible winds light 10 mph Lower hills gentler slopes likely require faster winds Its easier fly big hills because lift zone larger small hills can used favorable winds know sure try hill different wind conditions single important characteristic good slope faces wind youre lucky enough find slope faces prevailing wind area youll able fly often other end scale favorite sites hill requires northeasterly wind worksomething get about day 45 seems serious Sloper continues search good hills until hes found major point compass Its important hill have minimum trees vegetation Upwind obstructions create turbulence top Trees bushes slope face its top make tricky find good landing spot hill has road top wont have hike up down model radio tow optional its helpful enough worth February 1992 93 responding advertisers mention read about Model Aviation