DURATION Bob Meuser THIS month Ill start off favorite subjectsvariable-configuration aircraft VCA Whenever ride modern Jumbo jet am awed sight junk crank Out leading trailing edges wing prior landing What impressive however driver somehow manages get plane Kits earliest application principle something resembling competition-type model appeared Mechanics Illustrated magazine about 1941 later Model Builders Manual No 3 30-in rubberpowered model Ralph Baker see sketch employed well-engineered wing-release chanism controlled rubbertension appli cation folding wings rubber-power models likely disappointing unless model has times power-to-weight ratio rubber-power model have ever seen nearlystraight-up part climb has occupy sub stantial fraction total motor-run time Once climb angle gets down say 450 requirements imposed wing best climb substantially same minimum sinking speed glide Experiments folding-wing hand-launch gliders competition reported NFFS Digest last sixties nothing much came recently Mike Stan Stoy have astounding success glidersto point some have suggested should have separate competition classes folders non-foldersbut work has amply documented no need say about Boost-glide model rockets have also used folding wings 1972 Jack McGillivray Canada devel oped folder time appeared define future course AMA Power events climb wings folded vertical power cut wings un furled giving aircraft proportions like Nordic Towline Glider traditional Power model 1972 Nats Jack difficulty keeping model pointed up during climb tended follow ballistic trajectory Little has reported Jacks model apparently others have followed lead far Power models concerned following notable exception recently Bill Gieskieng Denver has built folder flying test-bed ideas followed full-blown FAI Power model See Letter Editor January issue page 125 model follows lines McGillivrays important exception wing Bills model moved forward parallelogram linkage during climb addi tion being folded give different kind stability McGillivrays Both models VCAs Above Jack McGillivrays Power model 1972 illustrates basic principle Small wing area/symmetrical airfoil climb large wing area/high-lift airfoil glide Meuser photos Below model appeared Meahan/cs Illustrated around 1941 principle same used McGillivray Bob has say about planes column / / / / N back box before aircraft gets tfle terminal Its matter manners understand order frighten other air craft flaps-down configuration considered threatening gesture well-mannered air craft simply doesnt sort thing polite company Anyhow. define VCA aircraft changes its shape during flight particularly applied FF model aircraft includes wing-swingers folders flappers models automatically con trolled programmed control surfaces sorts wondrous things moment lets just talk about folders models have wings folded up some fashion during part flight basic goal have low-drag configura tion expense lift during climb lots wing area decent high-lift airfoil section glide idea has around long time flying toy glider mid-thirties did balsa-sheet wings rotated folded back flat against sides fuselage held way model launched means sling-shot catapult air pressure during high-speed launch held back popped out glide position speed petered out Sometimes modern counterpart Johnny Carrs Invader marketed CMI Air\NfjY ZALPh bAkiizS rouSe 1941 54 Model Aviation stable different senses McGillivrays model stable sense arrow stable follows its nosebut nose gets pointed wrong way during launch game over Gieskieng moving wing farther ahead CG during climb attempts achieve helicopter-like stability climb During initial flight testing models twin rudders also folded half during climb attempt reduce arrow-like directional stability proved overkill tail wagged during climb rudders have since glued solid using unequal arm lengths parallelo gram linkage could get change wing incidence angle wing moves climb glide position thats lot cram package incidence change probably best done tail can controlled independently wing-wag hardware stuff intrigues warned neophytes success comes wont likely come easily Ask Stoy boys about Think SNART Now time start olannine 47BS S 11 B basa S ce Ralph Preys complex effective construction system avoiding warps wrinkles wings large lightweight Power models curved leading/trailing edges Sixth NIMAS Annual Record Trials SNART scheduled precede TwentyFour Hour Second World Peanut Gran Prix TFHSWPGP sponsored MIAMA everybody knows stands Miami 0 UT TIME IOO51 STAC4E RUBBEAAND TOXZt LINE Mechanical amplifier application boost ing capacity clockwork timers Bob has say column Indoor Aircraft Model Association Hope got right Doc Martin will kill case just dying know NIMAS stands National Indoor Model Aircraft Society youve paying attention well aware first five NARTs fabulous West Baden site Indiana Last years FNART included Indoor World Champion ships wont included year also First World Peanut Gran Prix tremendous success have attend enter TFHSWPGPyou can mail Peanut Scale models proxy flownbut course have attend compete SNART affair includes Indoor Indoor Scale Peanut Scale events starts 9 am Wednesday June 24 finishes Peanut Gran Prix runs 8 pm June 26 8 pm June 27 includes two award banquets Youll undoubtedly hear about other publications think might want enter write immediately Dr John Martin 3227 Darwin St Miami FL 33133 Ed note As werent enough 1981 Continued page 117 first FF folder modern toycatapult glider nearly identical tirst marketed thirties sharp eyeswill see max uoo nsa pinneu inc wings launch position photo left March 1981 55 think thats some sort Jimmy Allen Pursuit Warren Shipp holding youre wrong its Embryo Endurance-class com petition model event rules allow biplanes have 70 sq wing area 50 mono planes weighs lies beautifully despite its minimal dihedral B Warner Give little hype Ben Cleveland fuels own-design 1/zA i980 Heart Dixie FF meet model flies great P Foreman photo Peering trophies Heart Dixie meet young Julie Deep seems thinking Looking over. will win area Try soldering up two holes using tubing smaller *-in feed vent lines also use smallest fuel tubing filter can find limit quantity fuel neither tank nor engine guys against change better stop right go build some tanks Also mail bag letter Dave Clarkson whos now living South Africa truly Knows has seen cycle FAT Combat Britain Europe go Oliver 15 diesel racing glow back again 10-sized diesel FAT going great guns USA land plenty nitro elsewhere things going downhill angry auto manufacturers seeing writing wall concerning conservation fuel resources go blindly flying disposable models built score using nitro-guzzling engines devour $30-a-gallon fuel alarming rates Lets look further ahead summers Nats see what store FAT Combat years down road Dave suggests rethinking rules some thing outside USA can live places nitro components diesel fuel hard come very expen sive Lets assume methanol castor oil will available reasonable prices buy alky $100 gallon castor oil about $900 same quantity suggests 10-size motor 165cc ideal using bushing models no ball-bearing racing engines Lines would 012s 45 ft 11 long 14 meters Im sending Dave Cipolla lOs advertised magazine him test plan pick up myself see what would like fly model such engine John Gladfelter neat Slow Combat ship Nats featured external controls very simple construction approach similar Phil Cartier replaceable-wing model will cost just much build models great thing will take much time Performance almost good top-line model good enough contests know several clubs using one-design concept promoting Slow Combat meets everyone uses ship similar Gladfelters no disadvantage because slightly heavier draggier plane Ill leave something want list AAC setup Rossi Yep chromed aluminum liner aluminum pistonall $60 Write Henry Nelson 729 Valemont Dr Verona PA 15147 sure include stamped self-addressed envelope Henry prob ably wont have time reply can write address end column wont much good because Ijust steam off stamps save up buy glow plugs props Charlie Johnson 3716 Ingraham St San Diego CA 92109 Contester/Dunham Continued page 52 give two coats clear dope Flying prefer use right-hand pattem may need bit right rudder and/or right thrust ship being different Start power flights about 600 turns 1oop 1/16-in rubber strip about 14 long using geared winder As successful flights made progress winds may have experiment rubber size get optimum combination ship would suggest employ winding tube higher turns protect against breakage tube can constructed balsa though ready-made small di ameter plastic fiberglass tube will work pro viding will slide through nose opening properly adjusted ship capable times ranging neighborhood 50 70 seconds indoors Outdoor flight times tend vary greatly depending mostly airpicking capabilities Write care magazine have questions need docu mentation FF Indoor/Tenny Continued page 53 mercially available plastic propeller 2 No di mension model may exceed 24-in 3 Model must covered tissue no con denser paper microfilm plastic-based covering will allowed 4 No external wire thread bracing wood bracing allowed 5 onepiece solid motor stick required 6 No gears permitted 7 Model must hand-launched 8 Model rubber-poweredbest single flightof six attempts winsan official flight timed launch touch obstacle ground Bostonian Event other unusual event quite related Scale Bostonian event invented some time ago Ed Whitten apparently supposed take Manhattan Cabin step closer Scale current Bostonian rules 1 Maximum pro jected wingspans 16-in 2 Maximum wing chords 3-in 4 Maximum propeller diameter 6-in 4 Power limited rubber motors 5 Minimum weight rubber motors 7 grams 6 Maximum overall length 14-in measured front propeller bearing 7 Fuselage must contain theoretical box measuring 1-in 2-in 3-in larger longerons must both support motors form exceed box requirementno motor stick allowedfuselage must have forward windshield window side must equal exceed 1in square area 8 Landing gear must fixed two -in minimum-diameter wheels rigid enough support model hand-glided landing 9 ROG takeoffs required flights 10 Charisma Factor judge rates model depending upon much model appeals him based construction neatness scale-like details uniqueness design etca 10 110 rating usedtwo models may given same ratingthe models rated against other against 10 110 scale 11 An unlimited number official flights allowed total full seconds best three flights multiplied Charisma Factor Bud Tenny P0 Box 545 Richardson TX 75080 FF Duration/Meuser Continued page 55 AMA NationalsIndoor events scheduled same site June 20-23 See Competi tion Newsletter section February issue details RBMcM Wing construction Ive written about types wing construction times past have attempts solve same problem conflicting goals lightweight strength freedom March 1981 117 RETRACTABLE TOW HOOK RELEASE Price seso Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight 1 oz OTHER FOURMOST PRODUCTS tendencies warp crows-feet wrinkles covering construction time Various modelers attach different weights factors Also construction style appropriate band size-weight spectrum might might appropriate another band construction style shown sketch developed Ralph Prey appeared Satellite Ralph Radacteur en Chef Editor Heres Ralphs story Leading trailing edges have bugaboo nearly half-century Ive building models After experiments construction tech niques Ive come up design defies problems conventional butt-joint leading trailing edgeeven notched trailing edge balsa gussets problems Im sure shared builders Namely tissue kinks joint 0491051 AIRFLO ENGINE MOUNT REDuCES DRAG VIBRATION FREE PRICE 25O \J7 40 AIRFLO ENGINE MOUNT IDEAL FOR GUICKY 500 PRICE 525 rib leading trailing edge Also trailing edge very prone warping glue joint unwanted warp raises kinds problems trimming problems now solved construc tion technique shown No longer have kinks tissue joints No longer have warps trailing edge Ill first admit method complicated takes building time Some will argue heavier lets face name game time clock competition thats its However wont work anything straight leading trailing edge So Satellite builders eat hearts Out should make special note fact lot glue-joint area jib joins LE TE decreases tendency fronts ribs crush event mild crash extreme leading trailing edges protected spruce sturdierthan balsa against thumps bumps might promote nicks dont think need spruce TE try DT-ing onto barbed-wire fence sometime Mechanical relay An electrical relay uses turning off low-power signal switch large amounts electrical power device shown sketch does same thing mechanical motion application DT timer mousetraps DT string big Class D Gas model employs large wad rubberbands hold stab place hooked directly mousetrap mechanical DT timer large force exerts timer can slow down running make timer less reliable mechanical relay gain 5 10 can alleviate problem mechanism serves same function used Bill and/or Bob Hunter presented several years ago shown different hardware located neighborhood timer mechanism constructed style standard Tatone mousetrap incentive doing increase reliability Tatone-style timer used Class D Gas modelIm especially big Class Dbut provide system might adapted cheapie plastic toy motors used DT timers classes FF models especially important friction primary circuit below bit bent music wire running sloppy-fitting piece tubing adequate pro vided dont lubricate lubricant can pick up gobs sand dirt last months column mentioned report Aero Modeller about extending running time plastic timers typical 25 sec over two minutes pushing red-hot glass-head pin escapement have tried subse quently found running time extended merely 2 mm 6 glasshead pins used USI think sold silk pinsmust bit stouter used UK problem Once timer started would run full 6 mm regardless oriented pin escapement horizontal somehow timer stopped would restart reliably itself weight pinhead put CG escapement quite distance away escapement shaft dont know what circumstance would cause timer stop midstream absence self-starting capability half unwound isnt brand reliability makes feel comfortable solution add inertiaflywheel effectto escapement moving CG escapement too far its shaft can done bending pin around outside case adding gobs solder Still seems stretching time honest 5 mm required 999% reliability might still bit elusive Champion Coupe Continues Clobbering Com petition George Schroedter has continued developing Champion Coupe kits meet last October got five 2-mm maxes before 930 am shouldnt too difficult model gets consistent 2-mm still-air flights Georges does latest improvements consist less dihedral flat-bottom HL Glider-type airfoil prop wing turbulator 6-lb monofilament nylon top first spar 3/32-in 1/16-in rubber width fine-tuning horsepower Sig glass cloth place tissue around motor compartment 118 Model Aviation Winning Ideas FOURMOST Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming FUR~ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 1018 13311 Beach Ave Venice CA 90291 SPORT TRAINER f fl GLIDERSOS MAX 61 FSR AUTHENTIC BLUEPRINTS TELLITE KITS[ Gerua WW II E 7 OLD TIME GAS$10800 delivered Add 6%Fighters send 25 5 RUBBER 3 NORDICRear Exhaust Same Price 1980 catalog 9 COMPETITION GAS Call 408-274-1915 EEE SCIkS S AEEC -EXACT SCALE FUEL DT TIMERS -$1075 RAC Products EEAEXAATIE Model Supply13200_Knightswood Wayscalecraft PO Box 4231 Whittier Cult 90511 San Jose CA 95148 Previous kit purchasers have informed changes Talk about personalized customer service mention just case . Georges Wakefield kit still afew months off seems necessary tooling coming along Despite its flat-bottom airfoil Wake isnt mediocre-performance beginners affair should stack up few percent below sophisticated designs despite its simple construction prototype has yet fail make first-round max George also peddles some crazy stuff like 5/32-in sheet 5/32-in sq strip balsa Pirelli rubber Japanese tissue orthodontic rubberbands fuse DTs 39 per package 75 prop kits fiberglass cloth teflon washers perhaps other stuff cant find locally Check him Champion Model Prod 880 Carmen Ct La Veme CA 91750 Send buck catalog refunded upon receipt order 1980 Heart Dixie HOD FF Chain pionships held October 4-5 1980 Bill Jenkins won first HOD high-point trophy narrowly nosing out another tough competitor also AMAs secretary-treasurer Jim McNeill George Mulvihill Perryman made usual fine showing firsts Coupe OT Rubber P-30 Jim Lewis back contest trail first A-i second Mulvihill fourths A-2 OT Rubber Jim Davidson also back fold still has winning ways first Peanut seconds Rubber Scale Gas Scale Junior high-point winner David Brown first P-30 second Rubber Supple fifth Rubber Scale Trophies awarded first second third place winner Also contestants received merchandise prize Bob Meuser 4200 Gregory St Oakland CA 94619 FF Sport-SCale/Warner Continued page 57 Society P0 Box 121 South Euclid OH 44121 has magnificent line -in scale drawings Prof WF Kerka bimonthly newsletter nostalgia packets official air race photos great 1929-39 era names Goon Smoothie Jackrabbit Bonzo set blood coursing through veins guarantee getting touch AARS will worthwhile thing have done yourself week Send em $5 join just large SASE particulars Wedell-Williams Will Jr going make somebody winner next FAC Nats enough money left subscribe magazine dealing full-size aircraft would Aeroplane Monthly Out UK Covering recent developments well history publication high-quality usually has three-view drawings very interesting planes commonly found elsewhere LeeRichards Annular Granger Archaeopterix common types like Lockheed Orion DH Fox Moth Color photos occasional slip-in blueprints classic Flight mag azine spice up lot well-written articles historical aircraft war experiences round out presentation particularly like material pre-war British lightplanes yearly subscription rate presently $3640 includes air freight delivery Send subs Aeroplane Month ly IPC Business Press Ltd 205 E 42nd St New York NY 10017 Correction In December 1980 issue MAwe incorrectly attributed design Jack McGillivrays Missel Thrush Rubber Scale ship Bill Noonan Jacks own design bit different scale Bills Thanks Terry Jenkins calling slip attention Anyone tapered spars hear Jim Jones has peddling excellent balsa rubber strippers prop molds several years addition other FF supplies has intro duced gadget cutting tapered balsa strips least three different ways can taper strip crosswise thickness width understand Jims stripper will handle two three isnt bad dont know details interested best check Jim Jones 36631 Ledgestone Mt Clemens MI 48043 Engine Specialites Want have cylinder liner chrome plated honed. cranksht. perhaps some parts Cox 049 including left-handed cranks big pushers simply left-handed like see buddies expressions model climbs wrong direction nk cylinder can whittle out Schnuerle 049 neighborhood Try P & G Metal Shop 301 North Yale Dr Garland TX 75042 214 272-5210 Tell Gene Hempel Bob sent you. Keep em flying Bill Warner 432-C San Vicente Blvd Santa Monica CA 90402 Safety Comes First/Preston Continued page 60 Teamswho might likely experi ence interference on-the-spot TV news teams letter follows AMA Safety People am writing letter regards possible hazard may encountered groups putting model aircraft demonstrations have experienced hazard ourselves doing RC demonstration Luke AFB AZ Pattern ship go down March 1981 119 SPORT SCALE THE PORTERFIELD COLLEGIATE ideal model tar sport scale flyer Its gentle forgiving nature make perfect begin ners yet quite responsive skilled hands balsa construc tion light strong Porterfield can rog grass field climb steeply avoid obstacles Its light wing loading lets land dime give nine cents change Join quiet revolution enjoy Portertield Collegiate neighborhood park school yard Wing span 695 Area 695 sq Weight 4 lbs 3 channel radio Astro 15 can also use Astro 25 15 25 glow engine pert littl pupww n rudder ariu euuIILrol pylon racing ano eruoatic flying Spsi i inches weight 28 oz light weight 3 channel sq 1 1J19 flUTED FLIGHT INC PIONEERS IN SILENT FLIGHT
Edition: Model Aviation - 1981/03
Page Numbers: 54, 55, 117, 118, 119
DURATION Bob Meuser THIS month Ill start off favorite subjectsvariable-configuration aircraft VCA Whenever ride modern Jumbo jet am awed sight junk crank Out leading trailing edges wing prior landing What impressive however driver somehow manages get plane Kits earliest application principle something resembling competition-type model appeared Mechanics Illustrated magazine about 1941 later Model Builders Manual No 3 30-in rubberpowered model Ralph Baker see sketch employed well-engineered wing-release chanism controlled rubbertension appli cation folding wings rubber-power models likely disappointing unless model has times power-to-weight ratio rubber-power model have ever seen nearlystraight-up part climb has occupy sub stantial fraction total motor-run time Once climb angle gets down say 450 requirements imposed wing best climb substantially same minimum sinking speed glide Experiments folding-wing hand-launch gliders competition reported NFFS Digest last sixties nothing much came recently Mike Stan Stoy have astounding success glidersto point some have suggested should have separate competition classes folders non-foldersbut work has amply documented no need say about Boost-glide model rockets have also used folding wings 1972 Jack McGillivray Canada devel oped folder time appeared define future course AMA Power events climb wings folded vertical power cut wings un furled giving aircraft proportions like Nordic Towline Glider traditional Power model 1972 Nats Jack difficulty keeping model pointed up during climb tended follow ballistic trajectory Little has reported Jacks model apparently others have followed lead far Power models concerned following notable exception recently Bill Gieskieng Denver has built folder flying test-bed ideas followed full-blown FAI Power model See Letter Editor January issue page 125 model follows lines McGillivrays important exception wing Bills model moved forward parallelogram linkage during climb addi tion being folded give different kind stability McGillivrays Both models VCAs Above Jack McGillivrays Power model 1972 illustrates basic principle Small wing area/symmetrical airfoil climb large wing area/high-lift airfoil glide Meuser photos Below model appeared Meahan/cs Illustrated around 1941 principle same used McGillivray Bob has say about planes column / / / / N back box before aircraft gets tfle terminal Its matter manners understand order frighten other air craft flaps-down configuration considered threatening gesture well-mannered air craft simply doesnt sort thing polite company Anyhow. define VCA aircraft changes its shape during flight particularly applied FF model aircraft includes wing-swingers folders flappers models automatically con trolled programmed control surfaces sorts wondrous things moment lets just talk about folders models have wings folded up some fashion during part flight basic goal have low-drag configura tion expense lift during climb lots wing area decent high-lift airfoil section glide idea has around long time flying toy glider mid-thirties did balsa-sheet wings rotated folded back flat against sides fuselage held way model launched means sling-shot catapult air pressure during high-speed launch held back popped out glide position speed petered out Sometimes modern counterpart Johnny Carrs Invader marketed CMI Air\NfjY ZALPh bAkiizS rouSe 1941 54 Model Aviation stable different senses McGillivrays model stable sense arrow stable follows its nosebut nose gets pointed wrong way during launch game over Gieskieng moving wing farther ahead CG during climb attempts achieve helicopter-like stability climb During initial flight testing models twin rudders also folded half during climb attempt reduce arrow-like directional stability proved overkill tail wagged during climb rudders have since glued solid using unequal arm lengths parallelo gram linkage could get change wing incidence angle wing moves climb glide position thats lot cram package incidence change probably best done tail can controlled independently wing-wag hardware stuff intrigues warned neophytes success comes wont likely come easily Ask Stoy boys about Think SNART Now time start olannine 47BS S 11 B basa S ce Ralph Preys complex effective construction system avoiding warps wrinkles wings large lightweight Power models curved leading/trailing edges Sixth NIMAS Annual Record Trials SNART scheduled precede TwentyFour Hour Second World Peanut Gran Prix TFHSWPGP sponsored MIAMA everybody knows stands Miami 0 UT TIME IOO51 STAC4E RUBBEAAND TOXZt LINE Mechanical amplifier application boost ing capacity clockwork timers Bob has say column Indoor Aircraft Model Association Hope got right Doc Martin will kill case just dying know NIMAS stands National Indoor Model Aircraft Society youve paying attention well aware first five NARTs fabulous West Baden site Indiana Last years FNART included Indoor World Champion ships wont included year also First World Peanut Gran Prix tremendous success have attend enter TFHSWPGPyou can mail Peanut Scale models proxy flownbut course have attend compete SNART affair includes Indoor Indoor Scale Peanut Scale events starts 9 am Wednesday June 24 finishes Peanut Gran Prix runs 8 pm June 26 8 pm June 27 includes two award banquets Youll undoubtedly hear about other publications think might want enter write immediately Dr John Martin 3227 Darwin St Miami FL 33133 Ed note As werent enough 1981 Continued page 117 first FF folder modern toycatapult glider nearly identical tirst marketed thirties sharp eyeswill see max uoo nsa pinneu inc wings launch position photo left March 1981 55 think thats some sort Jimmy Allen Pursuit Warren Shipp holding youre wrong its Embryo Endurance-class com petition model event rules allow biplanes have 70 sq wing area 50 mono planes weighs lies beautifully despite its minimal dihedral B Warner Give little hype Ben Cleveland fuels own-design 1/zA i980 Heart Dixie FF meet model flies great P Foreman photo Peering trophies Heart Dixie meet young Julie Deep seems thinking Looking over. will win area Try soldering up two holes using tubing smaller *-in feed vent lines also use smallest fuel tubing filter can find limit quantity fuel neither tank nor engine guys against change better stop right go build some tanks Also mail bag letter Dave Clarkson whos now living South Africa truly Knows has seen cycle FAT Combat Britain Europe go Oliver 15 diesel racing glow back again 10-sized diesel FAT going great guns USA land plenty nitro elsewhere things going downhill angry auto manufacturers seeing writing wall concerning conservation fuel resources go blindly flying disposable models built score using nitro-guzzling engines devour $30-a-gallon fuel alarming rates Lets look further ahead summers Nats see what store FAT Combat years down road Dave suggests rethinking rules some thing outside USA can live places nitro components diesel fuel hard come very expen sive Lets assume methanol castor oil will available reasonable prices buy alky $100 gallon castor oil about $900 same quantity suggests 10-size motor 165cc ideal using bushing models no ball-bearing racing engines Lines would 012s 45 ft 11 long 14 meters Im sending Dave Cipolla lOs advertised magazine him test plan pick up myself see what would like fly model such engine John Gladfelter neat Slow Combat ship Nats featured external controls very simple construction approach similar Phil Cartier replaceable-wing model will cost just much build models great thing will take much time Performance almost good top-line model good enough contests know several clubs using one-design concept promoting Slow Combat meets everyone uses ship similar Gladfelters no disadvantage because slightly heavier draggier plane Ill leave something want list AAC setup Rossi Yep chromed aluminum liner aluminum pistonall $60 Write Henry Nelson 729 Valemont Dr Verona PA 15147 sure include stamped self-addressed envelope Henry prob ably wont have time reply can write address end column wont much good because Ijust steam off stamps save up buy glow plugs props Charlie Johnson 3716 Ingraham St San Diego CA 92109 Contester/Dunham Continued page 52 give two coats clear dope Flying prefer use right-hand pattem may need bit right rudder and/or right thrust ship being different Start power flights about 600 turns 1oop 1/16-in rubber strip about 14 long using geared winder As successful flights made progress winds may have experiment rubber size get optimum combination ship would suggest employ winding tube higher turns protect against breakage tube can constructed balsa though ready-made small di ameter plastic fiberglass tube will work pro viding will slide through nose opening properly adjusted ship capable times ranging neighborhood 50 70 seconds indoors Outdoor flight times tend vary greatly depending mostly airpicking capabilities Write care magazine have questions need docu mentation FF Indoor/Tenny Continued page 53 mercially available plastic propeller 2 No di mension model may exceed 24-in 3 Model must covered tissue no con denser paper microfilm plastic-based covering will allowed 4 No external wire thread bracing wood bracing allowed 5 onepiece solid motor stick required 6 No gears permitted 7 Model must hand-launched 8 Model rubber-poweredbest single flightof six attempts winsan official flight timed launch touch obstacle ground Bostonian Event other unusual event quite related Scale Bostonian event invented some time ago Ed Whitten apparently supposed take Manhattan Cabin step closer Scale current Bostonian rules 1 Maximum pro jected wingspans 16-in 2 Maximum wing chords 3-in 4 Maximum propeller diameter 6-in 4 Power limited rubber motors 5 Minimum weight rubber motors 7 grams 6 Maximum overall length 14-in measured front propeller bearing 7 Fuselage must contain theoretical box measuring 1-in 2-in 3-in larger longerons must both support motors form exceed box requirementno motor stick allowedfuselage must have forward windshield window side must equal exceed 1in square area 8 Landing gear must fixed two -in minimum-diameter wheels rigid enough support model hand-glided landing 9 ROG takeoffs required flights 10 Charisma Factor judge rates model depending upon much model appeals him based construction neatness scale-like details uniqueness design etca 10 110 rating usedtwo models may given same ratingthe models rated against other against 10 110 scale 11 An unlimited number official flights allowed total full seconds best three flights multiplied Charisma Factor Bud Tenny P0 Box 545 Richardson TX 75080 FF Duration/Meuser Continued page 55 AMA NationalsIndoor events scheduled same site June 20-23 See Competi tion Newsletter section February issue details RBMcM Wing construction Ive written about types wing construction times past have attempts solve same problem conflicting goals lightweight strength freedom March 1981 117 RETRACTABLE TOW HOOK RELEASE Price seso Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight 1 oz OTHER FOURMOST PRODUCTS tendencies warp crows-feet wrinkles covering construction time Various modelers attach different weights factors Also construction style appropriate band size-weight spectrum might might appropriate another band construction style shown sketch developed Ralph Prey appeared Satellite Ralph Radacteur en Chef Editor Heres Ralphs story Leading trailing edges have bugaboo nearly half-century Ive building models After experiments construction tech niques Ive come up design defies problems conventional butt-joint leading trailing edgeeven notched trailing edge balsa gussets problems Im sure shared builders Namely tissue kinks joint 0491051 AIRFLO ENGINE MOUNT REDuCES DRAG VIBRATION FREE PRICE 25O \J7 40 AIRFLO ENGINE MOUNT IDEAL FOR GUICKY 500 PRICE 525 rib leading trailing edge Also trailing edge very prone warping glue joint unwanted warp raises kinds problems trimming problems now solved construc tion technique shown No longer have kinks tissue joints No longer have warps trailing edge Ill first admit method complicated takes building time Some will argue heavier lets face name game time clock competition thats its However wont work anything straight leading trailing edge So Satellite builders eat hearts Out should make special note fact lot glue-joint area jib joins LE TE decreases tendency fronts ribs crush event mild crash extreme leading trailing edges protected spruce sturdierthan balsa against thumps bumps might promote nicks dont think need spruce TE try DT-ing onto barbed-wire fence sometime Mechanical relay An electrical relay uses turning off low-power signal switch large amounts electrical power device shown sketch does same thing mechanical motion application DT timer mousetraps DT string big Class D Gas model employs large wad rubberbands hold stab place hooked directly mousetrap mechanical DT timer large force exerts timer can slow down running make timer less reliable mechanical relay gain 5 10 can alleviate problem mechanism serves same function used Bill and/or Bob Hunter presented several years ago shown different hardware located neighborhood timer mechanism constructed style standard Tatone mousetrap incentive doing increase reliability Tatone-style timer used Class D Gas modelIm especially big Class Dbut provide system might adapted cheapie plastic toy motors used DT timers classes FF models especially important friction primary circuit below bit bent music wire running sloppy-fitting piece tubing adequate pro vided dont lubricate lubricant can pick up gobs sand dirt last months column mentioned report Aero Modeller about extending running time plastic timers typical 25 sec over two minutes pushing red-hot glass-head pin escapement have tried subse quently found running time extended merely 2 mm 6 glasshead pins used USI think sold silk pinsmust bit stouter used UK problem Once timer started would run full 6 mm regardless oriented pin escapement horizontal somehow timer stopped would restart reliably itself weight pinhead put CG escapement quite distance away escapement shaft dont know what circumstance would cause timer stop midstream absence self-starting capability half unwound isnt brand reliability makes feel comfortable solution add inertiaflywheel effectto escapement moving CG escapement too far its shaft can done bending pin around outside case adding gobs solder Still seems stretching time honest 5 mm required 999% reliability might still bit elusive Champion Coupe Continues Clobbering Com petition George Schroedter has continued developing Champion Coupe kits meet last October got five 2-mm maxes before 930 am shouldnt too difficult model gets consistent 2-mm still-air flights Georges does latest improvements consist less dihedral flat-bottom HL Glider-type airfoil prop wing turbulator 6-lb monofilament nylon top first spar 3/32-in 1/16-in rubber width fine-tuning horsepower Sig glass cloth place tissue around motor compartment 118 Model Aviation Winning Ideas FOURMOST Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming FUR~ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 1018 13311 Beach Ave Venice CA 90291 SPORT TRAINER f fl GLIDERSOS MAX 61 FSR AUTHENTIC BLUEPRINTS TELLITE KITS[ Gerua WW II E 7 OLD TIME GAS$10800 delivered Add 6%Fighters send 25 5 RUBBER 3 NORDICRear Exhaust Same Price 1980 catalog 9 COMPETITION GAS Call 408-274-1915 EEE SCIkS S AEEC -EXACT SCALE FUEL DT TIMERS -$1075 RAC Products EEAEXAATIE Model Supply13200_Knightswood Wayscalecraft PO Box 4231 Whittier Cult 90511 San Jose CA 95148 Previous kit purchasers have informed changes Talk about personalized customer service mention just case . Georges Wakefield kit still afew months off seems necessary tooling coming along Despite its flat-bottom airfoil Wake isnt mediocre-performance beginners affair should stack up few percent below sophisticated designs despite its simple construction prototype has yet fail make first-round max George also peddles some crazy stuff like 5/32-in sheet 5/32-in sq strip balsa Pirelli rubber Japanese tissue orthodontic rubberbands fuse DTs 39 per package 75 prop kits fiberglass cloth teflon washers perhaps other stuff cant find locally Check him Champion Model Prod 880 Carmen Ct La Veme CA 91750 Send buck catalog refunded upon receipt order 1980 Heart Dixie HOD FF Chain pionships held October 4-5 1980 Bill Jenkins won first HOD high-point trophy narrowly nosing out another tough competitor also AMAs secretary-treasurer Jim McNeill George Mulvihill Perryman made usual fine showing firsts Coupe OT Rubber P-30 Jim Lewis back contest trail first A-i second Mulvihill fourths A-2 OT Rubber Jim Davidson also back fold still has winning ways first Peanut seconds Rubber Scale Gas Scale Junior high-point winner David Brown first P-30 second Rubber Supple fifth Rubber Scale Trophies awarded first second third place winner Also contestants received merchandise prize Bob Meuser 4200 Gregory St Oakland CA 94619 FF Sport-SCale/Warner Continued page 57 Society P0 Box 121 South Euclid OH 44121 has magnificent line -in scale drawings Prof WF Kerka bimonthly newsletter nostalgia packets official air race photos great 1929-39 era names Goon Smoothie Jackrabbit Bonzo set blood coursing through veins guarantee getting touch AARS will worthwhile thing have done yourself week Send em $5 join just large SASE particulars Wedell-Williams Will Jr going make somebody winner next FAC Nats enough money left subscribe magazine dealing full-size aircraft would Aeroplane Monthly Out UK Covering recent developments well history publication high-quality usually has three-view drawings very interesting planes commonly found elsewhere LeeRichards Annular Granger Archaeopterix common types like Lockheed Orion DH Fox Moth Color photos occasional slip-in blueprints classic Flight mag azine spice up lot well-written articles historical aircraft war experiences round out presentation particularly like material pre-war British lightplanes yearly subscription rate presently $3640 includes air freight delivery Send subs Aeroplane Month ly IPC Business Press Ltd 205 E 42nd St New York NY 10017 Correction In December 1980 issue MAwe incorrectly attributed design Jack McGillivrays Missel Thrush Rubber Scale ship Bill Noonan Jacks own design bit different scale Bills Thanks Terry Jenkins calling slip attention Anyone tapered spars hear Jim Jones has peddling excellent balsa rubber strippers prop molds several years addition other FF supplies has intro duced gadget cutting tapered balsa strips least three different ways can taper strip crosswise thickness width understand Jims stripper will handle two three isnt bad dont know details interested best check Jim Jones 36631 Ledgestone Mt Clemens MI 48043 Engine Specialites Want have cylinder liner chrome plated honed. cranksht. perhaps some parts Cox 049 including left-handed cranks big pushers simply left-handed like see buddies expressions model climbs wrong direction nk cylinder can whittle out Schnuerle 049 neighborhood Try P & G Metal Shop 301 North Yale Dr Garland TX 75042 214 272-5210 Tell Gene Hempel Bob sent you. Keep em flying Bill Warner 432-C San Vicente Blvd Santa Monica CA 90402 Safety Comes First/Preston Continued page 60 Teamswho might likely experi ence interference on-the-spot TV news teams letter follows AMA Safety People am writing letter regards possible hazard may encountered groups putting model aircraft demonstrations have experienced hazard ourselves doing RC demonstration Luke AFB AZ Pattern ship go down March 1981 119 SPORT SCALE THE PORTERFIELD COLLEGIATE ideal model tar sport scale flyer Its gentle forgiving nature make perfect begin ners yet quite responsive skilled hands balsa construc tion light strong Porterfield can rog grass field climb steeply avoid obstacles Its light wing loading lets land dime give nine cents change Join quiet revolution enjoy Portertield Collegiate neighborhood park school yard Wing span 695 Area 695 sq Weight 4 lbs 3 channel radio Astro 15 can also use Astro 25 15 25 glow engine pert littl pupww n rudder ariu euuIILrol pylon racing ano eruoatic flying Spsi i inches weight 28 oz light weight 3 channel sq 1 1J19 flUTED FLIGHT INC PIONEERS IN SILENT FLIGHT
Edition: Model Aviation - 1981/03
Page Numbers: 54, 55, 117, 118, 119
DURATION Bob Meuser THIS month Ill start off favorite subjectsvariable-configuration aircraft VCA Whenever ride modern Jumbo jet am awed sight junk crank Out leading trailing edges wing prior landing What impressive however driver somehow manages get plane Kits earliest application principle something resembling competition-type model appeared Mechanics Illustrated magazine about 1941 later Model Builders Manual No 3 30-in rubberpowered model Ralph Baker see sketch employed well-engineered wing-release chanism controlled rubbertension appli cation folding wings rubber-power models likely disappointing unless model has times power-to-weight ratio rubber-power model have ever seen nearlystraight-up part climb has occupy sub stantial fraction total motor-run time Once climb angle gets down say 450 requirements imposed wing best climb substantially same minimum sinking speed glide Experiments folding-wing hand-launch gliders competition reported NFFS Digest last sixties nothing much came recently Mike Stan Stoy have astounding success glidersto point some have suggested should have separate competition classes folders non-foldersbut work has amply documented no need say about Boost-glide model rockets have also used folding wings 1972 Jack McGillivray Canada devel oped folder time appeared define future course AMA Power events climb wings folded vertical power cut wings un furled giving aircraft proportions like Nordic Towline Glider traditional Power model 1972 Nats Jack difficulty keeping model pointed up during climb tended follow ballistic trajectory Little has reported Jacks model apparently others have followed lead far Power models concerned following notable exception recently Bill Gieskieng Denver has built folder flying test-bed ideas followed full-blown FAI Power model See Letter Editor January issue page 125 model follows lines McGillivrays important exception wing Bills model moved forward parallelogram linkage during climb addi tion being folded give different kind stability McGillivrays Both models VCAs Above Jack McGillivrays Power model 1972 illustrates basic principle Small wing area/symmetrical airfoil climb large wing area/high-lift airfoil glide Meuser photos Below model appeared Meahan/cs Illustrated around 1941 principle same used McGillivray Bob has say about planes column / / / / N back box before aircraft gets tfle terminal Its matter manners understand order frighten other air craft flaps-down configuration considered threatening gesture well-mannered air craft simply doesnt sort thing polite company Anyhow. define VCA aircraft changes its shape during flight particularly applied FF model aircraft includes wing-swingers folders flappers models automatically con trolled programmed control surfaces sorts wondrous things moment lets just talk about folders models have wings folded up some fashion during part flight basic goal have low-drag configura tion expense lift during climb lots wing area decent high-lift airfoil section glide idea has around long time flying toy glider mid-thirties did balsa-sheet wings rotated folded back flat against sides fuselage held way model launched means sling-shot catapult air pressure during high-speed launch held back popped out glide position speed petered out Sometimes modern counterpart Johnny Carrs Invader marketed CMI Air\NfjY ZALPh bAkiizS rouSe 1941 54 Model Aviation stable different senses McGillivrays model stable sense arrow stable follows its nosebut nose gets pointed wrong way during launch game over Gieskieng moving wing farther ahead CG during climb attempts achieve helicopter-like stability climb During initial flight testing models twin rudders also folded half during climb attempt reduce arrow-like directional stability proved overkill tail wagged during climb rudders have since glued solid using unequal arm lengths parallelo gram linkage could get change wing incidence angle wing moves climb glide position thats lot cram package incidence change probably best done tail can controlled independently wing-wag hardware stuff intrigues warned neophytes success comes wont likely come easily Ask Stoy boys about Think SNART Now time start olannine 47BS S 11 B basa S ce Ralph Preys complex effective construction system avoiding warps wrinkles wings large lightweight Power models curved leading/trailing edges Sixth NIMAS Annual Record Trials SNART scheduled precede TwentyFour Hour Second World Peanut Gran Prix TFHSWPGP sponsored MIAMA everybody knows stands Miami 0 UT TIME IOO51 STAC4E RUBBEAAND TOXZt LINE Mechanical amplifier application boost ing capacity clockwork timers Bob has say column Indoor Aircraft Model Association Hope got right Doc Martin will kill case just dying know NIMAS stands National Indoor Model Aircraft Society youve paying attention well aware first five NARTs fabulous West Baden site Indiana Last years FNART included Indoor World Champion ships wont included year also First World Peanut Gran Prix tremendous success have attend enter TFHSWPGPyou can mail Peanut Scale models proxy flownbut course have attend compete SNART affair includes Indoor Indoor Scale Peanut Scale events starts 9 am Wednesday June 24 finishes Peanut Gran Prix runs 8 pm June 26 8 pm June 27 includes two award banquets Youll undoubtedly hear about other publications think might want enter write immediately Dr John Martin 3227 Darwin St Miami FL 33133 Ed note As werent enough 1981 Continued page 117 first FF folder modern toycatapult glider nearly identical tirst marketed thirties sharp eyeswill see max uoo nsa pinneu inc wings launch position photo left March 1981 55 think thats some sort Jimmy Allen Pursuit Warren Shipp holding youre wrong its Embryo Endurance-class com petition model event rules allow biplanes have 70 sq wing area 50 mono planes weighs lies beautifully despite its minimal dihedral B Warner Give little hype Ben Cleveland fuels own-design 1/zA i980 Heart Dixie FF meet model flies great P Foreman photo Peering trophies Heart Dixie meet young Julie Deep seems thinking Looking over. will win area Try soldering up two holes using tubing smaller *-in feed vent lines also use smallest fuel tubing filter can find limit quantity fuel neither tank nor engine guys against change better stop right go build some tanks Also mail bag letter Dave Clarkson whos now living South Africa truly Knows has seen cycle FAT Combat Britain Europe go Oliver 15 diesel racing glow back again 10-sized diesel FAT going great guns USA land plenty nitro elsewhere things going downhill angry auto manufacturers seeing writing wall concerning conservation fuel resources go blindly flying disposable models built score using nitro-guzzling engines devour $30-a-gallon fuel alarming rates Lets look further ahead summers Nats see what store FAT Combat years down road Dave suggests rethinking rules some thing outside USA can live places nitro components diesel fuel hard come very expen sive Lets assume methanol castor oil will available reasonable prices buy alky $100 gallon castor oil about $900 same quantity suggests 10-size motor 165cc ideal using bushing models no ball-bearing racing engines Lines would 012s 45 ft 11 long 14 meters Im sending Dave Cipolla lOs advertised magazine him test plan pick up myself see what would like fly model such engine John Gladfelter neat Slow Combat ship Nats featured external controls very simple construction approach similar Phil Cartier replaceable-wing model will cost just much build models great thing will take much time Performance almost good top-line model good enough contests know several clubs using one-design concept promoting Slow Combat meets everyone uses ship similar Gladfelters no disadvantage because slightly heavier draggier plane Ill leave something want list AAC setup Rossi Yep chromed aluminum liner aluminum pistonall $60 Write Henry Nelson 729 Valemont Dr Verona PA 15147 sure include stamped self-addressed envelope Henry prob ably wont have time reply can write address end column wont much good because Ijust steam off stamps save up buy glow plugs props Charlie Johnson 3716 Ingraham St San Diego CA 92109 Contester/Dunham Continued page 52 give two coats clear dope Flying prefer use right-hand pattem may need bit right rudder and/or right thrust ship being different Start power flights about 600 turns 1oop 1/16-in rubber strip about 14 long using geared winder As successful flights made progress winds may have experiment rubber size get optimum combination ship would suggest employ winding tube higher turns protect against breakage tube can constructed balsa though ready-made small di ameter plastic fiberglass tube will work pro viding will slide through nose opening properly adjusted ship capable times ranging neighborhood 50 70 seconds indoors Outdoor flight times tend vary greatly depending mostly airpicking capabilities Write care magazine have questions need docu mentation FF Indoor/Tenny Continued page 53 mercially available plastic propeller 2 No di mension model may exceed 24-in 3 Model must covered tissue no con denser paper microfilm plastic-based covering will allowed 4 No external wire thread bracing wood bracing allowed 5 onepiece solid motor stick required 6 No gears permitted 7 Model must hand-launched 8 Model rubber-poweredbest single flightof six attempts winsan official flight timed launch touch obstacle ground Bostonian Event other unusual event quite related Scale Bostonian event invented some time ago Ed Whitten apparently supposed take Manhattan Cabin step closer Scale current Bostonian rules 1 Maximum pro jected wingspans 16-in 2 Maximum wing chords 3-in 4 Maximum propeller diameter 6-in 4 Power limited rubber motors 5 Minimum weight rubber motors 7 grams 6 Maximum overall length 14-in measured front propeller bearing 7 Fuselage must contain theoretical box measuring 1-in 2-in 3-in larger longerons must both support motors form exceed box requirementno motor stick allowedfuselage must have forward windshield window side must equal exceed 1in square area 8 Landing gear must fixed two -in minimum-diameter wheels rigid enough support model hand-glided landing 9 ROG takeoffs required flights 10 Charisma Factor judge rates model depending upon much model appeals him based construction neatness scale-like details uniqueness design etca 10 110 rating usedtwo models may given same ratingthe models rated against other against 10 110 scale 11 An unlimited number official flights allowed total full seconds best three flights multiplied Charisma Factor Bud Tenny P0 Box 545 Richardson TX 75080 FF Duration/Meuser Continued page 55 AMA NationalsIndoor events scheduled same site June 20-23 See Competi tion Newsletter section February issue details RBMcM Wing construction Ive written about types wing construction times past have attempts solve same problem conflicting goals lightweight strength freedom March 1981 117 RETRACTABLE TOW HOOK RELEASE Price seso Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight 1 oz OTHER FOURMOST PRODUCTS tendencies warp crows-feet wrinkles covering construction time Various modelers attach different weights factors Also construction style appropriate band size-weight spectrum might might appropriate another band construction style shown sketch developed Ralph Prey appeared Satellite Ralph Radacteur en Chef Editor Heres Ralphs story Leading trailing edges have bugaboo nearly half-century Ive building models After experiments construction tech niques Ive come up design defies problems conventional butt-joint leading trailing edgeeven notched trailing edge balsa gussets problems Im sure shared builders Namely tissue kinks joint 0491051 AIRFLO ENGINE MOUNT REDuCES DRAG VIBRATION FREE PRICE 25O \J7 40 AIRFLO ENGINE MOUNT IDEAL FOR GUICKY 500 PRICE 525 rib leading trailing edge Also trailing edge very prone warping glue joint unwanted warp raises kinds problems trimming problems now solved construc tion technique shown No longer have kinks tissue joints No longer have warps trailing edge Ill first admit method complicated takes building time Some will argue heavier lets face name game time clock competition thats its However wont work anything straight leading trailing edge So Satellite builders eat hearts Out should make special note fact lot glue-joint area jib joins LE TE decreases tendency fronts ribs crush event mild crash extreme leading trailing edges protected spruce sturdierthan balsa against thumps bumps might promote nicks dont think need spruce TE try DT-ing onto barbed-wire fence sometime Mechanical relay An electrical relay uses turning off low-power signal switch large amounts electrical power device shown sketch does same thing mechanical motion application DT timer mousetraps DT string big Class D Gas model employs large wad rubberbands hold stab place hooked directly mousetrap mechanical DT timer large force exerts timer can slow down running make timer less reliable mechanical relay gain 5 10 can alleviate problem mechanism serves same function used Bill and/or Bob Hunter presented several years ago shown different hardware located neighborhood timer mechanism constructed style standard Tatone mousetrap incentive doing increase reliability Tatone-style timer used Class D Gas modelIm especially big Class Dbut provide system might adapted cheapie plastic toy motors used DT timers classes FF models especially important friction primary circuit below bit bent music wire running sloppy-fitting piece tubing adequate pro vided dont lubricate lubricant can pick up gobs sand dirt last months column mentioned report Aero Modeller about extending running time plastic timers typical 25 sec over two minutes pushing red-hot glass-head pin escapement have tried subse quently found running time extended merely 2 mm 6 glasshead pins used USI think sold silk pinsmust bit stouter used UK problem Once timer started would run full 6 mm regardless oriented pin escapement horizontal somehow timer stopped would restart reliably itself weight pinhead put CG escapement quite distance away escapement shaft dont know what circumstance would cause timer stop midstream absence self-starting capability half unwound isnt brand reliability makes feel comfortable solution add inertiaflywheel effectto escapement moving CG escapement too far its shaft can done bending pin around outside case adding gobs solder Still seems stretching time honest 5 mm required 999% reliability might still bit elusive Champion Coupe Continues Clobbering Com petition George Schroedter has continued developing Champion Coupe kits meet last October got five 2-mm maxes before 930 am shouldnt too difficult model gets consistent 2-mm still-air flights Georges does latest improvements consist less dihedral flat-bottom HL Glider-type airfoil prop wing turbulator 6-lb monofilament nylon top first spar 3/32-in 1/16-in rubber width fine-tuning horsepower Sig glass cloth place tissue around motor compartment 118 Model Aviation Winning Ideas FOURMOST Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming FUR~ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 1018 13311 Beach Ave Venice CA 90291 SPORT TRAINER f fl GLIDERSOS MAX 61 FSR AUTHENTIC BLUEPRINTS TELLITE KITS[ Gerua WW II E 7 OLD TIME GAS$10800 delivered Add 6%Fighters send 25 5 RUBBER 3 NORDICRear Exhaust Same Price 1980 catalog 9 COMPETITION GAS Call 408-274-1915 EEE SCIkS S AEEC -EXACT SCALE FUEL DT TIMERS -$1075 RAC Products EEAEXAATIE Model Supply13200_Knightswood Wayscalecraft PO Box 4231 Whittier Cult 90511 San Jose CA 95148 Previous kit purchasers have informed changes Talk about personalized customer service mention just case . Georges Wakefield kit still afew months off seems necessary tooling coming along Despite its flat-bottom airfoil Wake isnt mediocre-performance beginners affair should stack up few percent below sophisticated designs despite its simple construction prototype has yet fail make first-round max George also peddles some crazy stuff like 5/32-in sheet 5/32-in sq strip balsa Pirelli rubber Japanese tissue orthodontic rubberbands fuse DTs 39 per package 75 prop kits fiberglass cloth teflon washers perhaps other stuff cant find locally Check him Champion Model Prod 880 Carmen Ct La Veme CA 91750 Send buck catalog refunded upon receipt order 1980 Heart Dixie HOD FF Chain pionships held October 4-5 1980 Bill Jenkins won first HOD high-point trophy narrowly nosing out another tough competitor also AMAs secretary-treasurer Jim McNeill George Mulvihill Perryman made usual fine showing firsts Coupe OT Rubber P-30 Jim Lewis back contest trail first A-i second Mulvihill fourths A-2 OT Rubber Jim Davidson also back fold still has winning ways first Peanut seconds Rubber Scale Gas Scale Junior high-point winner David Brown first P-30 second Rubber Supple fifth Rubber Scale Trophies awarded first second third place winner Also contestants received merchandise prize Bob Meuser 4200 Gregory St Oakland CA 94619 FF Sport-SCale/Warner Continued page 57 Society P0 Box 121 South Euclid OH 44121 has magnificent line -in scale drawings Prof WF Kerka bimonthly newsletter nostalgia packets official air race photos great 1929-39 era names Goon Smoothie Jackrabbit Bonzo set blood coursing through veins guarantee getting touch AARS will worthwhile thing have done yourself week Send em $5 join just large SASE particulars Wedell-Williams Will Jr going make somebody winner next FAC Nats enough money left subscribe magazine dealing full-size aircraft would Aeroplane Monthly Out UK Covering recent developments well history publication high-quality usually has three-view drawings very interesting planes commonly found elsewhere LeeRichards Annular Granger Archaeopterix common types like Lockheed Orion DH Fox Moth Color photos occasional slip-in blueprints classic Flight mag azine spice up lot well-written articles historical aircraft war experiences round out presentation particularly like material pre-war British lightplanes yearly subscription rate presently $3640 includes air freight delivery Send subs Aeroplane Month ly IPC Business Press Ltd 205 E 42nd St New York NY 10017 Correction In December 1980 issue MAwe incorrectly attributed design Jack McGillivrays Missel Thrush Rubber Scale ship Bill Noonan Jacks own design bit different scale Bills Thanks Terry Jenkins calling slip attention Anyone tapered spars hear Jim Jones has peddling excellent balsa rubber strippers prop molds several years addition other FF supplies has intro duced gadget cutting tapered balsa strips least three different ways can taper strip crosswise thickness width understand Jims stripper will handle two three isnt bad dont know details interested best check Jim Jones 36631 Ledgestone Mt Clemens MI 48043 Engine Specialites Want have cylinder liner chrome plated honed. cranksht. perhaps some parts Cox 049 including left-handed cranks big pushers simply left-handed like see buddies expressions model climbs wrong direction nk cylinder can whittle out Schnuerle 049 neighborhood Try P & G Metal Shop 301 North Yale Dr Garland TX 75042 214 272-5210 Tell Gene Hempel Bob sent you. Keep em flying Bill Warner 432-C San Vicente Blvd Santa Monica CA 90402 Safety Comes First/Preston Continued page 60 Teamswho might likely experi ence interference on-the-spot TV news teams letter follows AMA Safety People am writing letter regards possible hazard may encountered groups putting model aircraft demonstrations have experienced hazard ourselves doing RC demonstration Luke AFB AZ Pattern ship go down March 1981 119 SPORT SCALE THE PORTERFIELD COLLEGIATE ideal model tar sport scale flyer Its gentle forgiving nature make perfect begin ners yet quite responsive skilled hands balsa construc tion light strong Porterfield can rog grass field climb steeply avoid obstacles Its light wing loading lets land dime give nine cents change Join quiet revolution enjoy Portertield Collegiate neighborhood park school yard Wing span 695 Area 695 sq Weight 4 lbs 3 channel radio Astro 15 can also use Astro 25 15 25 glow engine pert littl pupww n rudder ariu euuIILrol pylon racing ano eruoatic flying Spsi i inches weight 28 oz light weight 3 channel sq 1 1J19 flUTED FLIGHT INC PIONEERS IN SILENT FLIGHT
Edition: Model Aviation - 1981/03
Page Numbers: 54, 55, 117, 118, 119
DURATION Bob Meuser THIS month Ill start off favorite subjectsvariable-configuration aircraft VCA Whenever ride modern Jumbo jet am awed sight junk crank Out leading trailing edges wing prior landing What impressive however driver somehow manages get plane Kits earliest application principle something resembling competition-type model appeared Mechanics Illustrated magazine about 1941 later Model Builders Manual No 3 30-in rubberpowered model Ralph Baker see sketch employed well-engineered wing-release chanism controlled rubbertension appli cation folding wings rubber-power models likely disappointing unless model has times power-to-weight ratio rubber-power model have ever seen nearlystraight-up part climb has occupy sub stantial fraction total motor-run time Once climb angle gets down say 450 requirements imposed wing best climb substantially same minimum sinking speed glide Experiments folding-wing hand-launch gliders competition reported NFFS Digest last sixties nothing much came recently Mike Stan Stoy have astounding success glidersto point some have suggested should have separate competition classes folders non-foldersbut work has amply documented no need say about Boost-glide model rockets have also used folding wings 1972 Jack McGillivray Canada devel oped folder time appeared define future course AMA Power events climb wings folded vertical power cut wings un furled giving aircraft proportions like Nordic Towline Glider traditional Power model 1972 Nats Jack difficulty keeping model pointed up during climb tended follow ballistic trajectory Little has reported Jacks model apparently others have followed lead far Power models concerned following notable exception recently Bill Gieskieng Denver has built folder flying test-bed ideas followed full-blown FAI Power model See Letter Editor January issue page 125 model follows lines McGillivrays important exception wing Bills model moved forward parallelogram linkage during climb addi tion being folded give different kind stability McGillivrays Both models VCAs Above Jack McGillivrays Power model 1972 illustrates basic principle Small wing area/symmetrical airfoil climb large wing area/high-lift airfoil glide Meuser photos Below model appeared Meahan/cs Illustrated around 1941 principle same used McGillivray Bob has say about planes column / / / / N back box before aircraft gets tfle terminal Its matter manners understand order frighten other air craft flaps-down configuration considered threatening gesture well-mannered air craft simply doesnt sort thing polite company Anyhow. define VCA aircraft changes its shape during flight particularly applied FF model aircraft includes wing-swingers folders flappers models automatically con trolled programmed control surfaces sorts wondrous things moment lets just talk about folders models have wings folded up some fashion during part flight basic goal have low-drag configura tion expense lift during climb lots wing area decent high-lift airfoil section glide idea has around long time flying toy glider mid-thirties did balsa-sheet wings rotated folded back flat against sides fuselage held way model launched means sling-shot catapult air pressure during high-speed launch held back popped out glide position speed petered out Sometimes modern counterpart Johnny Carrs Invader marketed CMI Air\NfjY ZALPh bAkiizS rouSe 1941 54 Model Aviation stable different senses McGillivrays model stable sense arrow stable follows its nosebut nose gets pointed wrong way during launch game over Gieskieng moving wing farther ahead CG during climb attempts achieve helicopter-like stability climb During initial flight testing models twin rudders also folded half during climb attempt reduce arrow-like directional stability proved overkill tail wagged during climb rudders have since glued solid using unequal arm lengths parallelo gram linkage could get change wing incidence angle wing moves climb glide position thats lot cram package incidence change probably best done tail can controlled independently wing-wag hardware stuff intrigues warned neophytes success comes wont likely come easily Ask Stoy boys about Think SNART Now time start olannine 47BS S 11 B basa S ce Ralph Preys complex effective construction system avoiding warps wrinkles wings large lightweight Power models curved leading/trailing edges Sixth NIMAS Annual Record Trials SNART scheduled precede TwentyFour Hour Second World Peanut Gran Prix TFHSWPGP sponsored MIAMA everybody knows stands Miami 0 UT TIME IOO51 STAC4E RUBBEAAND TOXZt LINE Mechanical amplifier application boost ing capacity clockwork timers Bob has say column Indoor Aircraft Model Association Hope got right Doc Martin will kill case just dying know NIMAS stands National Indoor Model Aircraft Society youve paying attention well aware first five NARTs fabulous West Baden site Indiana Last years FNART included Indoor World Champion ships wont included year also First World Peanut Gran Prix tremendous success have attend enter TFHSWPGPyou can mail Peanut Scale models proxy flownbut course have attend compete SNART affair includes Indoor Indoor Scale Peanut Scale events starts 9 am Wednesday June 24 finishes Peanut Gran Prix runs 8 pm June 26 8 pm June 27 includes two award banquets Youll undoubtedly hear about other publications think might want enter write immediately Dr John Martin 3227 Darwin St Miami FL 33133 Ed note As werent enough 1981 Continued page 117 first FF folder modern toycatapult glider nearly identical tirst marketed thirties sharp eyeswill see max uoo nsa pinneu inc wings launch position photo left March 1981 55 think thats some sort Jimmy Allen Pursuit Warren Shipp holding youre wrong its Embryo Endurance-class com petition model event rules allow biplanes have 70 sq wing area 50 mono planes weighs lies beautifully despite its minimal dihedral B Warner Give little hype Ben Cleveland fuels own-design 1/zA i980 Heart Dixie FF meet model flies great P Foreman photo Peering trophies Heart Dixie meet young Julie Deep seems thinking Looking over. will win area Try soldering up two holes using tubing smaller *-in feed vent lines also use smallest fuel tubing filter can find limit quantity fuel neither tank nor engine guys against change better stop right go build some tanks Also mail bag letter Dave Clarkson whos now living South Africa truly Knows has seen cycle FAT Combat Britain Europe go Oliver 15 diesel racing glow back again 10-sized diesel FAT going great guns USA land plenty nitro elsewhere things going downhill angry auto manufacturers seeing writing wall concerning conservation fuel resources go blindly flying disposable models built score using nitro-guzzling engines devour $30-a-gallon fuel alarming rates Lets look further ahead summers Nats see what store FAT Combat years down road Dave suggests rethinking rules some thing outside USA can live places nitro components diesel fuel hard come very expen sive Lets assume methanol castor oil will available reasonable prices buy alky $100 gallon castor oil about $900 same quantity suggests 10-size motor 165cc ideal using bushing models no ball-bearing racing engines Lines would 012s 45 ft 11 long 14 meters Im sending Dave Cipolla lOs advertised magazine him test plan pick up myself see what would like fly model such engine John Gladfelter neat Slow Combat ship Nats featured external controls very simple construction approach similar Phil Cartier replaceable-wing model will cost just much build models great thing will take much time Performance almost good top-line model good enough contests know several clubs using one-design concept promoting Slow Combat meets everyone uses ship similar Gladfelters no disadvantage because slightly heavier draggier plane Ill leave something want list AAC setup Rossi Yep chromed aluminum liner aluminum pistonall $60 Write Henry Nelson 729 Valemont Dr Verona PA 15147 sure include stamped self-addressed envelope Henry prob ably wont have time reply can write address end column wont much good because Ijust steam off stamps save up buy glow plugs props Charlie Johnson 3716 Ingraham St San Diego CA 92109 Contester/Dunham Continued page 52 give two coats clear dope Flying prefer use right-hand pattem may need bit right rudder and/or right thrust ship being different Start power flights about 600 turns 1oop 1/16-in rubber strip about 14 long using geared winder As successful flights made progress winds may have experiment rubber size get optimum combination ship would suggest employ winding tube higher turns protect against breakage tube can constructed balsa though ready-made small di ameter plastic fiberglass tube will work pro viding will slide through nose opening properly adjusted ship capable times ranging neighborhood 50 70 seconds indoors Outdoor flight times tend vary greatly depending mostly airpicking capabilities Write care magazine have questions need docu mentation FF Indoor/Tenny Continued page 53 mercially available plastic propeller 2 No di mension model may exceed 24-in 3 Model must covered tissue no con denser paper microfilm plastic-based covering will allowed 4 No external wire thread bracing wood bracing allowed 5 onepiece solid motor stick required 6 No gears permitted 7 Model must hand-launched 8 Model rubber-poweredbest single flightof six attempts winsan official flight timed launch touch obstacle ground Bostonian Event other unusual event quite related Scale Bostonian event invented some time ago Ed Whitten apparently supposed take Manhattan Cabin step closer Scale current Bostonian rules 1 Maximum pro jected wingspans 16-in 2 Maximum wing chords 3-in 4 Maximum propeller diameter 6-in 4 Power limited rubber motors 5 Minimum weight rubber motors 7 grams 6 Maximum overall length 14-in measured front propeller bearing 7 Fuselage must contain theoretical box measuring 1-in 2-in 3-in larger longerons must both support motors form exceed box requirementno motor stick allowedfuselage must have forward windshield window side must equal exceed 1in square area 8 Landing gear must fixed two -in minimum-diameter wheels rigid enough support model hand-glided landing 9 ROG takeoffs required flights 10 Charisma Factor judge rates model depending upon much model appeals him based construction neatness scale-like details uniqueness design etca 10 110 rating usedtwo models may given same ratingthe models rated against other against 10 110 scale 11 An unlimited number official flights allowed total full seconds best three flights multiplied Charisma Factor Bud Tenny P0 Box 545 Richardson TX 75080 FF Duration/Meuser Continued page 55 AMA NationalsIndoor events scheduled same site June 20-23 See Competi tion Newsletter section February issue details RBMcM Wing construction Ive written about types wing construction times past have attempts solve same problem conflicting goals lightweight strength freedom March 1981 117 RETRACTABLE TOW HOOK RELEASE Price seso Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight 1 oz OTHER FOURMOST PRODUCTS tendencies warp crows-feet wrinkles covering construction time Various modelers attach different weights factors Also construction style appropriate band size-weight spectrum might might appropriate another band construction style shown sketch developed Ralph Prey appeared Satellite Ralph Radacteur en Chef Editor Heres Ralphs story Leading trailing edges have bugaboo nearly half-century Ive building models After experiments construction tech niques Ive come up design defies problems conventional butt-joint leading trailing edgeeven notched trailing edge balsa gussets problems Im sure shared builders Namely tissue kinks joint 0491051 AIRFLO ENGINE MOUNT REDuCES DRAG VIBRATION FREE PRICE 25O \J7 40 AIRFLO ENGINE MOUNT IDEAL FOR GUICKY 500 PRICE 525 rib leading trailing edge Also trailing edge very prone warping glue joint unwanted warp raises kinds problems trimming problems now solved construc tion technique shown No longer have kinks tissue joints No longer have warps trailing edge Ill first admit method complicated takes building time Some will argue heavier lets face name game time clock competition thats its However wont work anything straight leading trailing edge So Satellite builders eat hearts Out should make special note fact lot glue-joint area jib joins LE TE decreases tendency fronts ribs crush event mild crash extreme leading trailing edges protected spruce sturdierthan balsa against thumps bumps might promote nicks dont think need spruce TE try DT-ing onto barbed-wire fence sometime Mechanical relay An electrical relay uses turning off low-power signal switch large amounts electrical power device shown sketch does same thing mechanical motion application DT timer mousetraps DT string big Class D Gas model employs large wad rubberbands hold stab place hooked directly mousetrap mechanical DT timer large force exerts timer can slow down running make timer less reliable mechanical relay gain 5 10 can alleviate problem mechanism serves same function used Bill and/or Bob Hunter presented several years ago shown different hardware located neighborhood timer mechanism constructed style standard Tatone mousetrap incentive doing increase reliability Tatone-style timer used Class D Gas modelIm especially big Class Dbut provide system might adapted cheapie plastic toy motors used DT timers classes FF models especially important friction primary circuit below bit bent music wire running sloppy-fitting piece tubing adequate pro vided dont lubricate lubricant can pick up gobs sand dirt last months column mentioned report Aero Modeller about extending running time plastic timers typical 25 sec over two minutes pushing red-hot glass-head pin escapement have tried subse quently found running time extended merely 2 mm 6 glasshead pins used USI think sold silk pinsmust bit stouter used UK problem Once timer started would run full 6 mm regardless oriented pin escapement horizontal somehow timer stopped would restart reliably itself weight pinhead put CG escapement quite distance away escapement shaft dont know what circumstance would cause timer stop midstream absence self-starting capability half unwound isnt brand reliability makes feel comfortable solution add inertiaflywheel effectto escapement moving CG escapement too far its shaft can done bending pin around outside case adding gobs solder Still seems stretching time honest 5 mm required 999% reliability might still bit elusive Champion Coupe Continues Clobbering Com petition George Schroedter has continued developing Champion Coupe kits meet last October got five 2-mm maxes before 930 am shouldnt too difficult model gets consistent 2-mm still-air flights Georges does latest improvements consist less dihedral flat-bottom HL Glider-type airfoil prop wing turbulator 6-lb monofilament nylon top first spar 3/32-in 1/16-in rubber width fine-tuning horsepower Sig glass cloth place tissue around motor compartment 118 Model Aviation Winning Ideas FOURMOST Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming FUR~ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 1018 13311 Beach Ave Venice CA 90291 SPORT TRAINER f fl GLIDERSOS MAX 61 FSR AUTHENTIC BLUEPRINTS TELLITE KITS[ Gerua WW II E 7 OLD TIME GAS$10800 delivered Add 6%Fighters send 25 5 RUBBER 3 NORDICRear Exhaust Same Price 1980 catalog 9 COMPETITION GAS Call 408-274-1915 EEE SCIkS S AEEC -EXACT SCALE FUEL DT TIMERS -$1075 RAC Products EEAEXAATIE Model Supply13200_Knightswood Wayscalecraft PO Box 4231 Whittier Cult 90511 San Jose CA 95148 Previous kit purchasers have informed changes Talk about personalized customer service mention just case . Georges Wakefield kit still afew months off seems necessary tooling coming along Despite its flat-bottom airfoil Wake isnt mediocre-performance beginners affair should stack up few percent below sophisticated designs despite its simple construction prototype has yet fail make first-round max George also peddles some crazy stuff like 5/32-in sheet 5/32-in sq strip balsa Pirelli rubber Japanese tissue orthodontic rubberbands fuse DTs 39 per package 75 prop kits fiberglass cloth teflon washers perhaps other stuff cant find locally Check him Champion Model Prod 880 Carmen Ct La Veme CA 91750 Send buck catalog refunded upon receipt order 1980 Heart Dixie HOD FF Chain pionships held October 4-5 1980 Bill Jenkins won first HOD high-point trophy narrowly nosing out another tough competitor also AMAs secretary-treasurer Jim McNeill George Mulvihill Perryman made usual fine showing firsts Coupe OT Rubber P-30 Jim Lewis back contest trail first A-i second Mulvihill fourths A-2 OT Rubber Jim Davidson also back fold still has winning ways first Peanut seconds Rubber Scale Gas Scale Junior high-point winner David Brown first P-30 second Rubber Supple fifth Rubber Scale Trophies awarded first second third place winner Also contestants received merchandise prize Bob Meuser 4200 Gregory St Oakland CA 94619 FF Sport-SCale/Warner Continued page 57 Society P0 Box 121 South Euclid OH 44121 has magnificent line -in scale drawings Prof WF Kerka bimonthly newsletter nostalgia packets official air race photos great 1929-39 era names Goon Smoothie Jackrabbit Bonzo set blood coursing through veins guarantee getting touch AARS will worthwhile thing have done yourself week Send em $5 join just large SASE particulars Wedell-Williams Will Jr going make somebody winner next FAC Nats enough money left subscribe magazine dealing full-size aircraft would Aeroplane Monthly Out UK Covering recent developments well history publication high-quality usually has three-view drawings very interesting planes commonly found elsewhere LeeRichards Annular Granger Archaeopterix common types like Lockheed Orion DH Fox Moth Color photos occasional slip-in blueprints classic Flight mag azine spice up lot well-written articles historical aircraft war experiences round out presentation particularly like material pre-war British lightplanes yearly subscription rate presently $3640 includes air freight delivery Send subs Aeroplane Month ly IPC Business Press Ltd 205 E 42nd St New York NY 10017 Correction In December 1980 issue MAwe incorrectly attributed design Jack McGillivrays Missel Thrush Rubber Scale ship Bill Noonan Jacks own design bit different scale Bills Thanks Terry Jenkins calling slip attention Anyone tapered spars hear Jim Jones has peddling excellent balsa rubber strippers prop molds several years addition other FF supplies has intro duced gadget cutting tapered balsa strips least three different ways can taper strip crosswise thickness width understand Jims stripper will handle two three isnt bad dont know details interested best check Jim Jones 36631 Ledgestone Mt Clemens MI 48043 Engine Specialites Want have cylinder liner chrome plated honed. cranksht. perhaps some parts Cox 049 including left-handed cranks big pushers simply left-handed like see buddies expressions model climbs wrong direction nk cylinder can whittle out Schnuerle 049 neighborhood Try P & G Metal Shop 301 North Yale Dr Garland TX 75042 214 272-5210 Tell Gene Hempel Bob sent you. Keep em flying Bill Warner 432-C San Vicente Blvd Santa Monica CA 90402 Safety Comes First/Preston Continued page 60 Teamswho might likely experi ence interference on-the-spot TV news teams letter follows AMA Safety People am writing letter regards possible hazard may encountered groups putting model aircraft demonstrations have experienced hazard ourselves doing RC demonstration Luke AFB AZ Pattern ship go down March 1981 119 SPORT SCALE THE PORTERFIELD COLLEGIATE ideal model tar sport scale flyer Its gentle forgiving nature make perfect begin ners yet quite responsive skilled hands balsa construc tion light strong Porterfield can rog grass field climb steeply avoid obstacles Its light wing loading lets land dime give nine cents change Join quiet revolution enjoy Portertield Collegiate neighborhood park school yard Wing span 695 Area 695 sq Weight 4 lbs 3 channel radio Astro 15 can also use Astro 25 15 25 glow engine pert littl pupww n rudder ariu euuIILrol pylon racing ano eruoatic flying Spsi i inches weight 28 oz light weight 3 channel sq 1 1J19 flUTED FLIGHT INC PIONEERS IN SILENT FLIGHT
Edition: Model Aviation - 1981/03
Page Numbers: 54, 55, 117, 118, 119
DURATION Bob Meuser THIS month Ill start off favorite subjectsvariable-configuration aircraft VCA Whenever ride modern Jumbo jet am awed sight junk crank Out leading trailing edges wing prior landing What impressive however driver somehow manages get plane Kits earliest application principle something resembling competition-type model appeared Mechanics Illustrated magazine about 1941 later Model Builders Manual No 3 30-in rubberpowered model Ralph Baker see sketch employed well-engineered wing-release chanism controlled rubbertension appli cation folding wings rubber-power models likely disappointing unless model has times power-to-weight ratio rubber-power model have ever seen nearlystraight-up part climb has occupy sub stantial fraction total motor-run time Once climb angle gets down say 450 requirements imposed wing best climb substantially same minimum sinking speed glide Experiments folding-wing hand-launch gliders competition reported NFFS Digest last sixties nothing much came recently Mike Stan Stoy have astounding success glidersto point some have suggested should have separate competition classes folders non-foldersbut work has amply documented no need say about Boost-glide model rockets have also used folding wings 1972 Jack McGillivray Canada devel oped folder time appeared define future course AMA Power events climb wings folded vertical power cut wings un furled giving aircraft proportions like Nordic Towline Glider traditional Power model 1972 Nats Jack difficulty keeping model pointed up during climb tended follow ballistic trajectory Little has reported Jacks model apparently others have followed lead far Power models concerned following notable exception recently Bill Gieskieng Denver has built folder flying test-bed ideas followed full-blown FAI Power model See Letter Editor January issue page 125 model follows lines McGillivrays important exception wing Bills model moved forward parallelogram linkage during climb addi tion being folded give different kind stability McGillivrays Both models VCAs Above Jack McGillivrays Power model 1972 illustrates basic principle Small wing area/symmetrical airfoil climb large wing area/high-lift airfoil glide Meuser photos Below model appeared Meahan/cs Illustrated around 1941 principle same used McGillivray Bob has say about planes column / / / / N back box before aircraft gets tfle terminal Its matter manners understand order frighten other air craft flaps-down configuration considered threatening gesture well-mannered air craft simply doesnt sort thing polite company Anyhow. define VCA aircraft changes its shape during flight particularly applied FF model aircraft includes wing-swingers folders flappers models automatically con trolled programmed control surfaces sorts wondrous things moment lets just talk about folders models have wings folded up some fashion during part flight basic goal have low-drag configura tion expense lift during climb lots wing area decent high-lift airfoil section glide idea has around long time flying toy glider mid-thirties did balsa-sheet wings rotated folded back flat against sides fuselage held way model launched means sling-shot catapult air pressure during high-speed launch held back popped out glide position speed petered out Sometimes modern counterpart Johnny Carrs Invader marketed CMI Air\NfjY ZALPh bAkiizS rouSe 1941 54 Model Aviation stable different senses McGillivrays model stable sense arrow stable follows its nosebut nose gets pointed wrong way during launch game over Gieskieng moving wing farther ahead CG during climb attempts achieve helicopter-like stability climb During initial flight testing models twin rudders also folded half during climb attempt reduce arrow-like directional stability proved overkill tail wagged during climb rudders have since glued solid using unequal arm lengths parallelo gram linkage could get change wing incidence angle wing moves climb glide position thats lot cram package incidence change probably best done tail can controlled independently wing-wag hardware stuff intrigues warned neophytes success comes wont likely come easily Ask Stoy boys about Think SNART Now time start olannine 47BS S 11 B basa S ce Ralph Preys complex effective construction system avoiding warps wrinkles wings large lightweight Power models curved leading/trailing edges Sixth NIMAS Annual Record Trials SNART scheduled precede TwentyFour Hour Second World Peanut Gran Prix TFHSWPGP sponsored MIAMA everybody knows stands Miami 0 UT TIME IOO51 STAC4E RUBBEAAND TOXZt LINE Mechanical amplifier application boost ing capacity clockwork timers Bob has say column Indoor Aircraft Model Association Hope got right Doc Martin will kill case just dying know NIMAS stands National Indoor Model Aircraft Society youve paying attention well aware first five NARTs fabulous West Baden site Indiana Last years FNART included Indoor World Champion ships wont included year also First World Peanut Gran Prix tremendous success have attend enter TFHSWPGPyou can mail Peanut Scale models proxy flownbut course have attend compete SNART affair includes Indoor Indoor Scale Peanut Scale events starts 9 am Wednesday June 24 finishes Peanut Gran Prix runs 8 pm June 26 8 pm June 27 includes two award banquets Youll undoubtedly hear about other publications think might want enter write immediately Dr John Martin 3227 Darwin St Miami FL 33133 Ed note As werent enough 1981 Continued page 117 first FF folder modern toycatapult glider nearly identical tirst marketed thirties sharp eyeswill see max uoo nsa pinneu inc wings launch position photo left March 1981 55 think thats some sort Jimmy Allen Pursuit Warren Shipp holding youre wrong its Embryo Endurance-class com petition model event rules allow biplanes have 70 sq wing area 50 mono planes weighs lies beautifully despite its minimal dihedral B Warner Give little hype Ben Cleveland fuels own-design 1/zA i980 Heart Dixie FF meet model flies great P Foreman photo Peering trophies Heart Dixie meet young Julie Deep seems thinking Looking over. will win area Try soldering up two holes using tubing smaller *-in feed vent lines also use smallest fuel tubing filter can find limit quantity fuel neither tank nor engine guys against change better stop right go build some tanks Also mail bag letter Dave Clarkson whos now living South Africa truly Knows has seen cycle FAT Combat Britain Europe go Oliver 15 diesel racing glow back again 10-sized diesel FAT going great guns USA land plenty nitro elsewhere things going downhill angry auto manufacturers seeing writing wall concerning conservation fuel resources go blindly flying disposable models built score using nitro-guzzling engines devour $30-a-gallon fuel alarming rates Lets look further ahead summers Nats see what store FAT Combat years down road Dave suggests rethinking rules some thing outside USA can live places nitro components diesel fuel hard come very expen sive Lets assume methanol castor oil will available reasonable prices buy alky $100 gallon castor oil about $900 same quantity suggests 10-size motor 165cc ideal using bushing models no ball-bearing racing engines Lines would 012s 45 ft 11 long 14 meters Im sending Dave Cipolla lOs advertised magazine him test plan pick up myself see what would like fly model such engine John Gladfelter neat Slow Combat ship Nats featured external controls very simple construction approach similar Phil Cartier replaceable-wing model will cost just much build models great thing will take much time Performance almost good top-line model good enough contests know several clubs using one-design concept promoting Slow Combat meets everyone uses ship similar Gladfelters no disadvantage because slightly heavier draggier plane Ill leave something want list AAC setup Rossi Yep chromed aluminum liner aluminum pistonall $60 Write Henry Nelson 729 Valemont Dr Verona PA 15147 sure include stamped self-addressed envelope Henry prob ably wont have time reply can write address end column wont much good because Ijust steam off stamps save up buy glow plugs props Charlie Johnson 3716 Ingraham St San Diego CA 92109 Contester/Dunham Continued page 52 give two coats clear dope Flying prefer use right-hand pattem may need bit right rudder and/or right thrust ship being different Start power flights about 600 turns 1oop 1/16-in rubber strip about 14 long using geared winder As successful flights made progress winds may have experiment rubber size get optimum combination ship would suggest employ winding tube higher turns protect against breakage tube can constructed balsa though ready-made small di ameter plastic fiberglass tube will work pro viding will slide through nose opening properly adjusted ship capable times ranging neighborhood 50 70 seconds indoors Outdoor flight times tend vary greatly depending mostly airpicking capabilities Write care magazine have questions need docu mentation FF Indoor/Tenny Continued page 53 mercially available plastic propeller 2 No di mension model may exceed 24-in 3 Model must covered tissue no con denser paper microfilm plastic-based covering will allowed 4 No external wire thread bracing wood bracing allowed 5 onepiece solid motor stick required 6 No gears permitted 7 Model must hand-launched 8 Model rubber-poweredbest single flightof six attempts winsan official flight timed launch touch obstacle ground Bostonian Event other unusual event quite related Scale Bostonian event invented some time ago Ed Whitten apparently supposed take Manhattan Cabin step closer Scale current Bostonian rules 1 Maximum pro jected wingspans 16-in 2 Maximum wing chords 3-in 4 Maximum propeller diameter 6-in 4 Power limited rubber motors 5 Minimum weight rubber motors 7 grams 6 Maximum overall length 14-in measured front propeller bearing 7 Fuselage must contain theoretical box measuring 1-in 2-in 3-in larger longerons must both support motors form exceed box requirementno motor stick allowedfuselage must have forward windshield window side must equal exceed 1in square area 8 Landing gear must fixed two -in minimum-diameter wheels rigid enough support model hand-glided landing 9 ROG takeoffs required flights 10 Charisma Factor judge rates model depending upon much model appeals him based construction neatness scale-like details uniqueness design etca 10 110 rating usedtwo models may given same ratingthe models rated against other against 10 110 scale 11 An unlimited number official flights allowed total full seconds best three flights multiplied Charisma Factor Bud Tenny P0 Box 545 Richardson TX 75080 FF Duration/Meuser Continued page 55 AMA NationalsIndoor events scheduled same site June 20-23 See Competi tion Newsletter section February issue details RBMcM Wing construction Ive written about types wing construction times past have attempts solve same problem conflicting goals lightweight strength freedom March 1981 117 RETRACTABLE TOW HOOK RELEASE Price seso Simplest reliable device available After line released hook retracts body unit leaving SMOOTH surface bottom aircraft No special attachments required N eight 1 oz OTHER FOURMOST PRODUCTS tendencies warp crows-feet wrinkles covering construction time Various modelers attach different weights factors Also construction style appropriate band size-weight spectrum might might appropriate another band construction style shown sketch developed Ralph Prey appeared Satellite Ralph Radacteur en Chef Editor Heres Ralphs story Leading trailing edges have bugaboo nearly half-century Ive building models After experiments construction tech niques Ive come up design defies problems conventional butt-joint leading trailing edgeeven notched trailing edge balsa gussets problems Im sure shared builders Namely tissue kinks joint 0491051 AIRFLO ENGINE MOUNT REDuCES DRAG VIBRATION FREE PRICE 25O \J7 40 AIRFLO ENGINE MOUNT IDEAL FOR GUICKY 500 PRICE 525 rib leading trailing edge Also trailing edge very prone warping glue joint unwanted warp raises kinds problems trimming problems now solved construc tion technique shown No longer have kinks tissue joints No longer have warps trailing edge Ill first admit method complicated takes building time Some will argue heavier lets face name game time clock competition thats its However wont work anything straight leading trailing edge So Satellite builders eat hearts Out should make special note fact lot glue-joint area jib joins LE TE decreases tendency fronts ribs crush event mild crash extreme leading trailing edges protected spruce sturdierthan balsa against thumps bumps might promote nicks dont think need spruce TE try DT-ing onto barbed-wire fence sometime Mechanical relay An electrical relay uses turning off low-power signal switch large amounts electrical power device shown sketch does same thing mechanical motion application DT timer mousetraps DT string big Class D Gas model employs large wad rubberbands hold stab place hooked directly mousetrap mechanical DT timer large force exerts timer can slow down running make timer less reliable mechanical relay gain 5 10 can alleviate problem mechanism serves same function used Bill and/or Bob Hunter presented several years ago shown different hardware located neighborhood timer mechanism constructed style standard Tatone mousetrap incentive doing increase reliability Tatone-style timer used Class D Gas modelIm especially big Class Dbut provide system might adapted cheapie plastic toy motors used DT timers classes FF models especially important friction primary circuit below bit bent music wire running sloppy-fitting piece tubing adequate pro vided dont lubricate lubricant can pick up gobs sand dirt last months column mentioned report Aero Modeller about extending running time plastic timers typical 25 sec over two minutes pushing red-hot glass-head pin escapement have tried subse quently found running time extended merely 2 mm 6 glasshead pins used USI think sold silk pinsmust bit stouter used UK problem Once timer started would run full 6 mm regardless oriented pin escapement horizontal somehow timer stopped would restart reliably itself weight pinhead put CG escapement quite distance away escapement shaft dont know what circumstance would cause timer stop midstream absence self-starting capability half unwound isnt brand reliability makes feel comfortable solution add inertiaflywheel effectto escapement moving CG escapement too far its shaft can done bending pin around outside case adding gobs solder Still seems stretching time honest 5 mm required 999% reliability might still bit elusive Champion Coupe Continues Clobbering Com petition George Schroedter has continued developing Champion Coupe kits meet last October got five 2-mm maxes before 930 am shouldnt too difficult model gets consistent 2-mm still-air flights Georges does latest improvements consist less dihedral flat-bottom HL Glider-type airfoil prop wing turbulator 6-lb monofilament nylon top first spar 3/32-in 1/16-in rubber width fine-tuning horsepower Sig glass cloth place tissue around motor compartment 118 Model Aviation Winning Ideas FOURMOST Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming FUR~ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 1018 13311 Beach Ave Venice CA 90291 SPORT TRAINER f fl GLIDERSOS MAX 61 FSR AUTHENTIC BLUEPRINTS TELLITE KITS[ Gerua WW II E 7 OLD TIME GAS$10800 delivered Add 6%Fighters send 25 5 RUBBER 3 NORDICRear Exhaust Same Price 1980 catalog 9 COMPETITION GAS Call 408-274-1915 EEE SCIkS S AEEC -EXACT SCALE FUEL DT TIMERS -$1075 RAC Products EEAEXAATIE Model Supply13200_Knightswood Wayscalecraft PO Box 4231 Whittier Cult 90511 San Jose CA 95148 Previous kit purchasers have informed changes Talk about personalized customer service mention just case . Georges Wakefield kit still afew months off seems necessary tooling coming along Despite its flat-bottom airfoil Wake isnt mediocre-performance beginners affair should stack up few percent below sophisticated designs despite its simple construction prototype has yet fail make first-round max George also peddles some crazy stuff like 5/32-in sheet 5/32-in sq strip balsa Pirelli rubber Japanese tissue orthodontic rubberbands fuse DTs 39 per package 75 prop kits fiberglass cloth teflon washers perhaps other stuff cant find locally Check him Champion Model Prod 880 Carmen Ct La Veme CA 91750 Send buck catalog refunded upon receipt order 1980 Heart Dixie HOD FF Chain pionships held October 4-5 1980 Bill Jenkins won first HOD high-point trophy narrowly nosing out another tough competitor also AMAs secretary-treasurer Jim McNeill George Mulvihill Perryman made usual fine showing firsts Coupe OT Rubber P-30 Jim Lewis back contest trail first A-i second Mulvihill fourths A-2 OT Rubber Jim Davidson also back fold still has winning ways first Peanut seconds Rubber Scale Gas Scale Junior high-point winner David Brown first P-30 second Rubber Supple fifth Rubber Scale Trophies awarded first second third place winner Also contestants received merchandise prize Bob Meuser 4200 Gregory St Oakland CA 94619 FF Sport-SCale/Warner Continued page 57 Society P0 Box 121 South Euclid OH 44121 has magnificent line -in scale drawings Prof WF Kerka bimonthly newsletter nostalgia packets official air race photos great 1929-39 era names Goon Smoothie Jackrabbit Bonzo set blood coursing through veins guarantee getting touch AARS will worthwhile thing have done yourself week Send em $5 join just large SASE particulars Wedell-Williams Will Jr going make somebody winner next FAC Nats enough money left subscribe magazine dealing full-size aircraft would Aeroplane Monthly Out UK Covering recent developments well history publication high-quality usually has three-view drawings very interesting planes commonly found elsewhere LeeRichards Annular Granger Archaeopterix common types like Lockheed Orion DH Fox Moth Color photos occasional slip-in blueprints classic Flight mag azine spice up lot well-written articles historical aircraft war experiences round out presentation particularly like material pre-war British lightplanes yearly subscription rate presently $3640 includes air freight delivery Send subs Aeroplane Month ly IPC Business Press Ltd 205 E 42nd St New York NY 10017 Correction In December 1980 issue MAwe incorrectly attributed design Jack McGillivrays Missel Thrush Rubber Scale ship Bill Noonan Jacks own design bit different scale Bills Thanks Terry Jenkins calling slip attention Anyone tapered spars hear Jim Jones has peddling excellent balsa rubber strippers prop molds several years addition other FF supplies has intro duced gadget cutting tapered balsa strips least three different ways can taper strip crosswise thickness width understand Jims stripper will handle two three isnt bad dont know details interested best check Jim Jones 36631 Ledgestone Mt Clemens MI 48043 Engine Specialites Want have cylinder liner chrome plated honed. cranksht. perhaps some parts Cox 049 including left-handed cranks big pushers simply left-handed like see buddies expressions model climbs wrong direction nk cylinder can whittle out Schnuerle 049 neighborhood Try P & G Metal Shop 301 North Yale Dr Garland TX 75042 214 272-5210 Tell Gene Hempel Bob sent you. Keep em flying Bill Warner 432-C San Vicente Blvd Santa Monica CA 90402 Safety Comes First/Preston Continued page 60 Teamswho might likely experi ence interference on-the-spot TV news teams letter follows AMA Safety People am writing letter regards possible hazard may encountered groups putting model aircraft demonstrations have experienced hazard ourselves doing RC demonstration Luke AFB AZ Pattern ship go down March 1981 119 SPORT SCALE THE PORTERFIELD COLLEGIATE ideal model tar sport scale flyer Its gentle forgiving nature make perfect begin ners yet quite responsive skilled hands balsa construc tion light strong Porterfield can rog grass field climb steeply avoid obstacles Its light wing loading lets land dime give nine cents change Join quiet revolution enjoy Portertield Collegiate neighborhood park school yard Wing span 695 Area 695 sq Weight 4 lbs 3 channel radio Astro 15 can also use Astro 25 15 25 glow engine pert littl pupww n rudder ariu euuIILrol pylon racing ano eruoatic flying Spsi i inches weight 28 oz light weight 3 channel sq 1 1J19 flUTED FLIGHT INC PIONEERS IN SILENT FLIGHT