The moment truth prototype builder Bob Langdon few milliseconds maiden flight Dawnwalker Ill rubber wound only400turns winds less ideal model clocked absolutely magnificent 330 prop leading edge profile clearly flaring under power burst efficient power utilization no-frills lightweight approach model also very evident THERE IS NOTHING NEW under sun True late Sixties George Perryman flying 2-oz Unlimited Rubber subsequently renamed Mulvihill ship featured 5-mm motor run fixed prop dethermalizing condenser paper covering Zaic three-view drawing notes pointed heavier regu lar version obviously would survive better competition Since time course have changes both AMA FF Rubber events emerging special contests suspect will eventually find place rule book intriguing what once named Meuser Marvelous Mulvi hill after innovative founder Robert B Meuser well known columnist/author/de signer aim probe ultimate Mulvihill performance through earlymorning dawn one-shot winner-take-all contest now rules simple foxy order eliminate occa sional Pennyplane F iD entry regular AMA Mulvihill rules applyplusthe model must have double-covered surfaces en closed motor airplane itself must weigh minimum 30 grams model rubber motor must weigh no less 60 grams Very challenging number such competitions have staged over past seven years notably US FF Championships Taft Robert P White Great Grand Gumbandito has pretty much dominated event remarkable times averaging 11 mm high 14 min airplane 80-gram version renowned Twin Fin represents current state art have great respect thought worthwhile broach alternate 1984 Reno Nats several San Diego Orbiteer crowd hunkered down over casino food sort dared other attempt indoor/outdoortype Mulvihill might eventually prove viable contender Dawn Flight events date four us Charlie Yost Robert Langdon Don McHugh author have built flown eight pre tenders task varying degrees success Weights have run 50 80 grams Fragility factor zero passable Langdon recorded high time 15 min 40 sec Otay Mesa test field intended withstand rigors midday com petition unlimited-type Mulvihill model designed early morning calm air has butterfly-like speed almost mesmerizing grace stretch near-nothing lift unbeliev able flight duration EJohn Oldenkamp 64 Model Aviation went across Mexican border retrieve has best results prop run 840 Dawnwalker prototype snapped wing dethermalizing Air loads collapsed McHughs new creation about 130 experiment unknowns have become public through pragmatism have extremely delightful deal work project progressed still experi menting model presented could starting point aspiring Mulvihill flier view very safe design rewards builder uncommon pleas ure Dawnwalker fact captured first place its first outing regular Mulvi eventwith no help pilot sent off downthrust shim omitted first flight absolutely majestic flight Given light non-thermal conditions will butterfly along approximately 150 rpm through prop run 5 8 mm depending trim air density settling heart stoppingly slow glide after prop folds ways clearly retrograde model acting like doing things really shouldnt days hightechery Left heart matter big thin highiy-pitched prop gives th Dawnwaiker series its punch Easy make sheet balsa thinned white glue props can-formed have soiderless hubs Foreground version fora model lii whiie background ver sions eariier sets Rubberbands earlierversions assist folding proved unneeeded Right Front end motortube reinforced strapping tape outside Also note notch forthe winding bar tube piatforms DT hardware weighed 176 gramstotal Left Wing mounting system strong lightweight Wili let motor tube distort winds piled up Straight-grain pylon sides may make some nervous work fine Add vertical pieces strength like Right Alternate sliced-rib wing construction want ultimate slow flier Prototype wing background used 36-in lengths leading edge stock weighed 13 grams August 1986 65 angaon aaaea extra semi-webbing wing tips stabilizersectionnot really necessary greatly improves strength Air loads alone will keep prop folded discovery process has answered some questions Lightweights need fly slowly once upset invariably go power stall speed up dash earth discouraging results tricky ground turbulence seem need inordinate amount power-robbing downthrust cure foregoing However given light air performance ab solutely astoundingly magnificent think will disappointed try Construction Target weight fin ished model less rubber motor 55 grams Selection materials very im portant thoughtful use glue Proper ly done will hit mark end up attractive reasonably robust machine Weigh everything ahead time good triple beam balance scale discard parts grossly overweight As guidelines balsa sheet weights about follows motor tube blank 345 x 36 95 grams rib sheet stock 3 x 36 Bgrain 12 grams wing leading edge LE trailing edge TE stock /32 x rams etc Some 6-lb stock actually stronger 10 12-lb stock depending grain makeup Propeller might want start unit since somewhat different norm blade outlines should cut laid up thinned white glue form similar plan No need soak blades Merely tape position separated wax paper set aside few days dry hub little block spruce cut drilled size relieved shaft front rubbed out Hot Stuff hardening prop folder stops glued after installation hangers last step photos should help explain Suffice say solderless hub unit comes out very light being strong enough task After prop blades dry should edge-sanded covered dope tissue bottom cut made inlet tubing carries hangers glued place cyanoacrylate CyA plywood cheeks put place Form hangers simple wire Ls test-fit tubing inlets Set blade pitch jig proper orientation tape hanger down 900 thrust line gob 5min epoxy will hold together Once both blades done mounted hub kept place short lengths tubing glued outer ends hangers well should have prop unit nominal 23 diameter 30 pitch hub spring washers target weight 12 14 grams Stabilizer/fin Build next Use wood sizes shown plan try go easy CyA glue Try avoid placing stress parts helping prevent unnecessary warping p / / / \ NI / j N AV / -I i /~A-. fin has internal basswood spar gets installed off plan after diagonals place stabilizer has light ribs external basswood spars vertical webbing leave out Uncovered weights 5 gram fm 18 grams stabilizer 25 grams both could tolerated Sand pieces well set aside covering Wing helpful line up pins locating LE TE good straightedge Pin pieces place plywood template cut out ribs Cut fit diagonally glue until polyhedral ribs also cut fit set proper angles method prepare angular templates polyhedral plan glue set ribs before adding anything else Left Wing structureatoentersection showsexternai spars webbing dlhedrai keeper iightweightgussetsasareoften seenon Indoor modeis Ribs medium-to-firm 1/16-in quarter-grain sheet Right internai spar diagonal components fin made basswood frame firm springy stock Giued cyanoacryiate very smaii drops covered weight wiii under 1 gram 66 Model Aviation Looking through supertransiucentSky wrap coverIng shows off functional design exceiient proportions highiy-speclallzed model Au pica author Full-Size Plans Available. See Page 162 2 '-~ 9 4 __e6 743& 4f / 2A~ a66 24 w -J z 0 Tip washout should shimmed indi cated As insurance actually crack TE douse CyA hold setting shims razor-planed contour can used over over Lastly add top external basswood spar Remove whole wing plan turn over gluing bottom spar Fudge vertical webbing shown glue place Air loads lightweight model demand use web bing leave out Sand everything cut panels apart prop up units install proper polyhedral After add ply brace center hogging out holes three center ribs insertion glue CyA uncovered wing should weigh 12 16 grams tape rubberbands Try get seam very straight should have cut sheet approx 06 wider indicated circumference x D et unit outside sun near benign heat source Under good conditions blank will take set dry about hour dry start wiggle blank bit make sure free mandrel may have slip card under seam free up once sure free time glue seam holding everything over paper bag over back lawn pulling tube off mandrel seam pointed down tack-glue inch As long pointed down CyA will bite Once off form set tube upright paper bag piece wax paper bottom run fat bead CyA down intended seam letting gravity work After squaring up ends sanding block install collars shown set aside boom similarly formed dope hot water should made Y32 A-grain sheet should either measured gore made pattern Form dry above tack-glue seam removed mandrel Cut glue circular bulkheads cram place long dowel dive bomb CyA glue keep place essential Continued page 152 Fuselage dislike making rolled-tube mo tor sticks unparalleled strength/weight bit bullet methods might lessen pain make convert plans call nominal dimensions based availability materials can buy good A-grain stock weighs nine 11 grams per 4-in-wide sheet means go larger diameter used closet rods lumberyard man drels withthe rear lOin orsotaperedwith razor plane form upward-tapering boom straight part sand out nice sheet balsa both sides dope side three times thinned-out ni trate dope Sand again dope has dried Hold blank undoped side up under bathroom shower about 30 sec water hot can get Try keep doped side dry fry thy hands Pat dry sort wrap/coax around mandrel Hold place masking August 1986 67 Superlight stabilizer platform dethermalizer system have proven reliable several authois previous models Hold-down hook fuse snuffer complete simple setup FF Duration/Murphy Continued page 149 have suddenly appeared everywhere again being listed $695but sale $591 mechanism seems somewhat smaller version last saw shelves however spring very strong can rigged up used fuel shutoff very satisfactorily wont attempt explain pet apparatus design harness mechanisms fuel shut-off use seems nearly Gas flier has own patented device conversion no means unique have something little different surefire functional would certainly interested relaying design readers Well its about time disappear two months well So see ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Indoor/Tenny Continued page 62 form twisted like prop blade will fit flat prop block Thus out line formed already properly curved twisted done outline should fitted block during construction moistened relieve stress twisting glued ribs spar after drying Note outline moistened after being tached ribs spar wood will ex pand stress whole structure Prop covering Prop blades should covered prop block possible Otherwise water saliva used adhesive cover trim prop return prop block until moisture has evaporated Also prop covered prop block film must slack enough blade lie film distortion blade twist - can changed during covering film will too tight let blade resume normal twist stress Another important tactic sure film attached both outline ribs accomplishes three things First mois ture used adhesive entire blade ex pands evenly minimizing stress Second individual panels film small enough stiffen blade Finally damage film single section wont spread other sections Dont worry about wrinkles appear blades dry out simple operation will remove Use very fine artist brush moistened water work out wrinkles Stroke brush along wrinkle will pull up level film around After wrinkles treated let whole assembly dry again Finally store prop holder keeps blades touching anything Prop InnovatIons number different plastic props available photos shows convert efficient pusher operation Peanut Scale models free wheeling ratchet front trimmed flat make bearing surface shaft pro jected through hub bent over push against blade Al Backstrom flew setup Bedford Boys Ranch Bedford TX Another photo shows same basic prop hub Photo 1 case small plastic blades removed much larger balsa blades substituted model Profile Scale model flown Randy Randolph again Bedford Boys Ranch Novice Pennyplane has rule limiting prop diameter handle power three-gram model needs Jim Clem trying very wide blades 2Y-in wide blade six inches long shaft tip Ill report performance soon can get some numbers Next time prop blocks prop-covering techniques Bud Tenny Box 545 Richardson TX 75080 Dawnwalker/Oldenkafl1P Continued page 67 maintain rigidity aft motor peg form mount DT tube platforms etc True up main joint slide boom over aft motor hard collar glue works together white glue CyA Eyeball everything good symmetry Sand whole fuselage including down right thrust Add platforms front edge strapping tape reinforcement CyA glue wicks well stufi make up pylons pins wing plat form etc Sand wing mounting unit contour glue yet Make drill nose plug may want spray IN STOCK FOR IMMEDIATE SHIPMENT NEW AH 6237 Cu in$19995 NewOoedre40CDII3-bOeniflgI$12995 Reg 0040 40 912266 Bnighelle flywheel 014295 Reg Ooede 40 Power Aeoenrbly Only$7195 OUAORA REPAIR81000 plo pertol Jin Me. ERCOUPEPLANS $2300 SEMI-KIT 99995 Jim Moeger TOMAHAWK PLANS $2290 SEMI-KIT $9996 Jin Menor6BALLTRPLANS $2395 SEMI-KIT$9995 Ji Meceer ACROBATPLANS 91996 SEMI-KIT $6996 MALONEY 100912996ZONOAH 939 $12995 SACHS-DOLMAR ai CDI 9637 CDI 96 FLOATS 49 114 onclc $2190 co,rplnte kit $4796 19WWIWHEELS 92696 PlKSpningStenton92490 PLANS SUPER STEARMAN 114 IGodfreyl$2999 113 TAYLORCRAFT 0112 CUB Nelite92995 Volkoplco 113 Chicken Charliol$2395 Servo H366 42 no $1296 Wonld 516 9 Ing wodele 93696 PROPS loll aicee Anger Top Flit Oynethnool 20% OFF US Onedre FUEL TANKS160066992300 9796 FIBERGLASS ARROW SHAFTS 911$ 023 long6/61196 24 Hoe Se.4nc 5250 penEege Seed Meek Cheek en Meey 0-do JIM MESSERS QUALITY MODEL PRODUCTS Valey View Dr Box 43 eany NY 14706 PRODUCTS Complete Line Exhaust Systems o Tuned Pipes0 Muffled Tuned Pipes o Headers * Venturi Mufflers o Expansion Mufflers 0 Helicopter Ball Mufflers ialized Exhaust Systems UnsurpaSJ WANNA RACE N RTH AST AREA BEGINNER RACES 0 nFORM-1 oFAI E Instructions Club Programs Information Contact NORTH EAST PYLON RACING ORGANIZATION m 119 DEAN AVE FRANKLIN MASS 02038 Tel 617 528-4043 203 673-2000 152 Model Aviation MODEL PRODUCTS CORP BOX 314 Pompton Plains NJ 07444 available write direct add S200 $500 outside US Covering assembly biggest stumbling blocks us locating lightweight covering materials After trying rejecting several fortunate locate non-modeling product have dubbed Skywrap weighs about 40% best tissue adheres either white glue RC56 shrinks under passive heat open oven door accepts spray dope color accents can drawn drafting ink etc quite strong puncture proof stuff commonly used supermarkets taking home veggies As plastics go amazing stuff sample roll am using Conoco North Carolina can find stuff dont afraid use am currently trying arrange supply unperforated unprinted lengths mail order sale Ordinary modeling tissue will work things carefully Finish off weak alcohol spray two thin coats plasti cized nitrate dope Krylon Crystal Clear tissue job will probably sag damp weather despair nature beast have used Skywrap no such problems will occur Either way try get smooth job Add usual AMA numbers identification label name address phone number big splat oolor left wing tip will help timer keep plane sight should have prop assembly finished put platforms etc Line up install vertical fin Mount stabilizer rubberbands put hunk DT fuse Strap wing pylons/platform unit Add prop assem bly front set up model over knife-edge surface balancing may need extra hands operation Nudge things around bit until correct balance point achieved pencil-mark pylons motor tube Hot Stuff wing mount place over marks Take few minutes admire finished product Check warps niisalignments Since purpose-built aircraft really will tolerate gross aberrations Carefully weigh whole unit taking note gram readout Mark figure down plane somewhere Trimming/flying Assuming airframe weight 55 60 grams beginning power should 12 strands of-in rubber approx 40 long Make up three motors Lube well let rest overnight Two should dried off broken wound breaking point sounds waste ful rubber batches vary greatlyeven within same batch Make note airplane max wind figure make deal yourselfto never exceed 90% figureeven going gold can credit George Perryman tip insist try some test glides motor installed prop folded thin shim will probably needed under rear stabilizeras much /16 looks appropriate crank 400 turns launch allowing model fly out hand wont ball fire point Stalls cured usual way add downthrust minor right thrust Hope fully altitude will gained prop will fold glide can observed Resist over-elevating ship wants go low slow take forever get clock prop rpm will get about 150 Add power bunches 100 winds shimming/trimming out unwanted ten dencies Eventually will have worked way up 1150 turns beast will come alive like proverbial butterfly proudly justifying its crafty competitive builder should can get emotional witnessing kinds aero delights ship strong enough flown zephyrs pushing eight knots own after point Changes Dawnwalker III starting place wish explore maximum Mulvihill performance Dawnwalker used sliced-rib alternate shown plans although flew very well flew August 1986 153 fuselage components light coat Krylon Crystal Clear B #1301 #1303 really necessaryand sand #400 paper EASY TO BUILD HANDCRAFTED KITS AT LOW PRICES 3g spanWeigni OsWing span s Wing span WeIght 4 lOs Length 53 inEngine 60 -90Length 45 inEngine 45 -60Length 48 inEngine 40 Kits include Pre-built fiberglass fuselage foam cores sheeted balsa machine cut balsa tail surfaces shaped strip ailerons complete hardware pack SEND CHECK OR MONEY ORDER TOVISA & MASTER CARD ACCEPTED W HORIZON MODELS INC T-404 Kelly Ave Manchester NH 03103 603 627-9503 indoors club meeting won trophy strong belch would throw off course terminal tail slide airfoil shown should very generally allow better penetration turbulence pro vide superior glide somewhat durable could increase mo tor tube length believe would appreciably enhance performance V-dihedral has tried have taller pylons neither added much except struc tural problems heart design low aspect ratio wing very slow prop/rubber combination opposed tra ditional out-of-sight climb/glide mode uppermost thought fun pursuit toward worthwhile goal uncon ventional point view hope build fly project will extract same pleasure did 154 Model Aviation CL Scale/Boss Continued page 68 patibility chart May 1985 column stiffened cloth will easier work will look much neater threads will straighter instead wavy squirrelly look cant avoid using standard application method item W Rozelle found Wing Tips Newsletter Mid-Hudson Mod elmasters courtesy SAM re printed Corsair Mini-contest report Roland Baltes San Pedro CA reports Southwestern Regionals held Buckeye AZ once seeing fair turnout CL Sport Scale event years event held January entry nine models four twin-engine types Weather good temperature Seventies wind minimum excellent day Scale flying Some months photos Roland Buckeye entries Roland commented nine entries may seem like much happening area hasnt seen Scale meet over year turnout nine considered fairly good Roland expects next years contest hopes able report another good increase activity Please send correspondenceand espe cially photosrelating CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 69 other maneuver Square Eight helped aft center gravity wind Because planes speed increase opens up corners tough keep maneuver right size As mentioned last month horse power maneuver strong engine will worth its weight gold maintaining line ten sion resisting speed increases hint havent great engine make maneuver tall narrow spend less time try ing penetrate wind wont perfect will able complete recogniza able Eight calm air move backwards during top horizontal leg thus allowing critical areas bottom corners intersectionto flown free wake turbulence Also avoid hit ting corners hard calm high drag results will sap airspeed horse power weak engine can run out steam long difficult Square Eight Whipping couple laps prior entry will build up little stored energy good air Vertical Eight quite easy can find cloud 450 use inter sections simply fly two perfect loops top other wind up becomes lot tougher way up never let fuselage get hori zontal intersection does will never get top loop round right size against wind Reverse control just before path airplane starts descend regardless its body angle Once get top consciously apply Down control maintain radius outside loop make intersection wind blows down exception rule never seeing body angle tangent intersection before reversing control Allow flight path just stop descending before giv ing Up complete Eight Try avoid non-pro look climbing inverted inter section relatively painless calm-air maneu ver step two just past intersection way up should enough Hourglass probably mistreated maneuvers almost fliers make same errors As Triangle first corner turned too far resulting climb angles far off fliers right second error often combination first mak ing top leg parallel bottom Both er rors result plane being position impossible complete maneu ver acceptably either front behind directly over head flier solution addition horsepower first error stop first corner just flying correct Triangle resulting climb steep slightly infl fl P55 PS flflPS PS PS PS PS S PS PS 4 VIDEO i Special Summer Rates June tbru August Only Rentals 1y 1195 Any 2 2300 All Tape Purchases 10% OFF - - Retail - 1 Basic Construction Beginners 107 Mm 49 95 42 Basic Flight Training Beginners 65 Mm44 95 3 World Model Aniarion 90 Mm 44 95 4 Oshkosh Onerviess 55Mm 3995 5Airplane Funnies 30 Mm39 95 61JS Scln Masters 60 Mm4195 Action 75 Mm 4995 dge Hoppin Vol 145 Mm 41 95 4 9 Which Wag Up 70 Mm 47954 K lOHedga Hoppin Vol 1140 Mm 4195 4 Rental Depositm Retail Price Tape 4 K Rental Dnratlnnm 7 Days After Del lueryK K Payment Chech 110 daysl MO Visa/M C Card # & 4 4 Eup Date Phone # C OD u Anailahle hy Phone4 K Shippingm 375 Foreign Canada Add 10% Total 4 4 Others 15% IL Res Add 7% Tan4 KAcademy AvIatIon R & D PO Boo 2774 4Hazel Crest IL 60428 335-07764 4.4
Edition: Model Aviation - 1986/08
Page Numbers: 64, 65, 66, 67, 152, 153, 154
The moment truth prototype builder Bob Langdon few milliseconds maiden flight Dawnwalker Ill rubber wound only400turns winds less ideal model clocked absolutely magnificent 330 prop leading edge profile clearly flaring under power burst efficient power utilization no-frills lightweight approach model also very evident THERE IS NOTHING NEW under sun True late Sixties George Perryman flying 2-oz Unlimited Rubber subsequently renamed Mulvihill ship featured 5-mm motor run fixed prop dethermalizing condenser paper covering Zaic three-view drawing notes pointed heavier regu lar version obviously would survive better competition Since time course have changes both AMA FF Rubber events emerging special contests suspect will eventually find place rule book intriguing what once named Meuser Marvelous Mulvi hill after innovative founder Robert B Meuser well known columnist/author/de signer aim probe ultimate Mulvihill performance through earlymorning dawn one-shot winner-take-all contest now rules simple foxy order eliminate occa sional Pennyplane F iD entry regular AMA Mulvihill rules applyplusthe model must have double-covered surfaces en closed motor airplane itself must weigh minimum 30 grams model rubber motor must weigh no less 60 grams Very challenging number such competitions have staged over past seven years notably US FF Championships Taft Robert P White Great Grand Gumbandito has pretty much dominated event remarkable times averaging 11 mm high 14 min airplane 80-gram version renowned Twin Fin represents current state art have great respect thought worthwhile broach alternate 1984 Reno Nats several San Diego Orbiteer crowd hunkered down over casino food sort dared other attempt indoor/outdoortype Mulvihill might eventually prove viable contender Dawn Flight events date four us Charlie Yost Robert Langdon Don McHugh author have built flown eight pre tenders task varying degrees success Weights have run 50 80 grams Fragility factor zero passable Langdon recorded high time 15 min 40 sec Otay Mesa test field intended withstand rigors midday com petition unlimited-type Mulvihill model designed early morning calm air has butterfly-like speed almost mesmerizing grace stretch near-nothing lift unbeliev able flight duration EJohn Oldenkamp 64 Model Aviation went across Mexican border retrieve has best results prop run 840 Dawnwalker prototype snapped wing dethermalizing Air loads collapsed McHughs new creation about 130 experiment unknowns have become public through pragmatism have extremely delightful deal work project progressed still experi menting model presented could starting point aspiring Mulvihill flier view very safe design rewards builder uncommon pleas ure Dawnwalker fact captured first place its first outing regular Mulvi eventwith no help pilot sent off downthrust shim omitted first flight absolutely majestic flight Given light non-thermal conditions will butterfly along approximately 150 rpm through prop run 5 8 mm depending trim air density settling heart stoppingly slow glide after prop folds ways clearly retrograde model acting like doing things really shouldnt days hightechery Left heart matter big thin highiy-pitched prop gives th Dawnwaiker series its punch Easy make sheet balsa thinned white glue props can-formed have soiderless hubs Foreground version fora model lii whiie background ver sions eariier sets Rubberbands earlierversions assist folding proved unneeeded Right Front end motortube reinforced strapping tape outside Also note notch forthe winding bar tube piatforms DT hardware weighed 176 gramstotal Left Wing mounting system strong lightweight Wili let motor tube distort winds piled up Straight-grain pylon sides may make some nervous work fine Add vertical pieces strength like Right Alternate sliced-rib wing construction want ultimate slow flier Prototype wing background used 36-in lengths leading edge stock weighed 13 grams August 1986 65 angaon aaaea extra semi-webbing wing tips stabilizersectionnot really necessary greatly improves strength Air loads alone will keep prop folded discovery process has answered some questions Lightweights need fly slowly once upset invariably go power stall speed up dash earth discouraging results tricky ground turbulence seem need inordinate amount power-robbing downthrust cure foregoing However given light air performance ab solutely astoundingly magnificent think will disappointed try Construction Target weight fin ished model less rubber motor 55 grams Selection materials very im portant thoughtful use glue Proper ly done will hit mark end up attractive reasonably robust machine Weigh everything ahead time good triple beam balance scale discard parts grossly overweight As guidelines balsa sheet weights about follows motor tube blank 345 x 36 95 grams rib sheet stock 3 x 36 Bgrain 12 grams wing leading edge LE trailing edge TE stock /32 x rams etc Some 6-lb stock actually stronger 10 12-lb stock depending grain makeup Propeller might want start unit since somewhat different norm blade outlines should cut laid up thinned white glue form similar plan No need soak blades Merely tape position separated wax paper set aside few days dry hub little block spruce cut drilled size relieved shaft front rubbed out Hot Stuff hardening prop folder stops glued after installation hangers last step photos should help explain Suffice say solderless hub unit comes out very light being strong enough task After prop blades dry should edge-sanded covered dope tissue bottom cut made inlet tubing carries hangers glued place cyanoacrylate CyA plywood cheeks put place Form hangers simple wire Ls test-fit tubing inlets Set blade pitch jig proper orientation tape hanger down 900 thrust line gob 5min epoxy will hold together Once both blades done mounted hub kept place short lengths tubing glued outer ends hangers well should have prop unit nominal 23 diameter 30 pitch hub spring washers target weight 12 14 grams Stabilizer/fin Build next Use wood sizes shown plan try go easy CyA glue Try avoid placing stress parts helping prevent unnecessary warping p / / / \ NI / j N AV / -I i /~A-. fin has internal basswood spar gets installed off plan after diagonals place stabilizer has light ribs external basswood spars vertical webbing leave out Uncovered weights 5 gram fm 18 grams stabilizer 25 grams both could tolerated Sand pieces well set aside covering Wing helpful line up pins locating LE TE good straightedge Pin pieces place plywood template cut out ribs Cut fit diagonally glue until polyhedral ribs also cut fit set proper angles method prepare angular templates polyhedral plan glue set ribs before adding anything else Left Wing structureatoentersection showsexternai spars webbing dlhedrai keeper iightweightgussetsasareoften seenon Indoor modeis Ribs medium-to-firm 1/16-in quarter-grain sheet Right internai spar diagonal components fin made basswood frame firm springy stock Giued cyanoacryiate very smaii drops covered weight wiii under 1 gram 66 Model Aviation Looking through supertransiucentSky wrap coverIng shows off functional design exceiient proportions highiy-speclallzed model Au pica author Full-Size Plans Available. See Page 162 2 '-~ 9 4 __e6 743& 4f / 2A~ a66 24 w -J z 0 Tip washout should shimmed indi cated As insurance actually crack TE douse CyA hold setting shims razor-planed contour can used over over Lastly add top external basswood spar Remove whole wing plan turn over gluing bottom spar Fudge vertical webbing shown glue place Air loads lightweight model demand use web bing leave out Sand everything cut panels apart prop up units install proper polyhedral After add ply brace center hogging out holes three center ribs insertion glue CyA uncovered wing should weigh 12 16 grams tape rubberbands Try get seam very straight should have cut sheet approx 06 wider indicated circumference x D et unit outside sun near benign heat source Under good conditions blank will take set dry about hour dry start wiggle blank bit make sure free mandrel may have slip card under seam free up once sure free time glue seam holding everything over paper bag over back lawn pulling tube off mandrel seam pointed down tack-glue inch As long pointed down CyA will bite Once off form set tube upright paper bag piece wax paper bottom run fat bead CyA down intended seam letting gravity work After squaring up ends sanding block install collars shown set aside boom similarly formed dope hot water should made Y32 A-grain sheet should either measured gore made pattern Form dry above tack-glue seam removed mandrel Cut glue circular bulkheads cram place long dowel dive bomb CyA glue keep place essential Continued page 152 Fuselage dislike making rolled-tube mo tor sticks unparalleled strength/weight bit bullet methods might lessen pain make convert plans call nominal dimensions based availability materials can buy good A-grain stock weighs nine 11 grams per 4-in-wide sheet means go larger diameter used closet rods lumberyard man drels withthe rear lOin orsotaperedwith razor plane form upward-tapering boom straight part sand out nice sheet balsa both sides dope side three times thinned-out ni trate dope Sand again dope has dried Hold blank undoped side up under bathroom shower about 30 sec water hot can get Try keep doped side dry fry thy hands Pat dry sort wrap/coax around mandrel Hold place masking August 1986 67 Superlight stabilizer platform dethermalizer system have proven reliable several authois previous models Hold-down hook fuse snuffer complete simple setup FF Duration/Murphy Continued page 149 have suddenly appeared everywhere again being listed $695but sale $591 mechanism seems somewhat smaller version last saw shelves however spring very strong can rigged up used fuel shutoff very satisfactorily wont attempt explain pet apparatus design harness mechanisms fuel shut-off use seems nearly Gas flier has own patented device conversion no means unique have something little different surefire functional would certainly interested relaying design readers Well its about time disappear two months well So see ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Indoor/Tenny Continued page 62 form twisted like prop blade will fit flat prop block Thus out line formed already properly curved twisted done outline should fitted block during construction moistened relieve stress twisting glued ribs spar after drying Note outline moistened after being tached ribs spar wood will ex pand stress whole structure Prop covering Prop blades should covered prop block possible Otherwise water saliva used adhesive cover trim prop return prop block until moisture has evaporated Also prop covered prop block film must slack enough blade lie film distortion blade twist - can changed during covering film will too tight let blade resume normal twist stress Another important tactic sure film attached both outline ribs accomplishes three things First mois ture used adhesive entire blade ex pands evenly minimizing stress Second individual panels film small enough stiffen blade Finally damage film single section wont spread other sections Dont worry about wrinkles appear blades dry out simple operation will remove Use very fine artist brush moistened water work out wrinkles Stroke brush along wrinkle will pull up level film around After wrinkles treated let whole assembly dry again Finally store prop holder keeps blades touching anything Prop InnovatIons number different plastic props available photos shows convert efficient pusher operation Peanut Scale models free wheeling ratchet front trimmed flat make bearing surface shaft pro jected through hub bent over push against blade Al Backstrom flew setup Bedford Boys Ranch Bedford TX Another photo shows same basic prop hub Photo 1 case small plastic blades removed much larger balsa blades substituted model Profile Scale model flown Randy Randolph again Bedford Boys Ranch Novice Pennyplane has rule limiting prop diameter handle power three-gram model needs Jim Clem trying very wide blades 2Y-in wide blade six inches long shaft tip Ill report performance soon can get some numbers Next time prop blocks prop-covering techniques Bud Tenny Box 545 Richardson TX 75080 Dawnwalker/Oldenkafl1P Continued page 67 maintain rigidity aft motor peg form mount DT tube platforms etc True up main joint slide boom over aft motor hard collar glue works together white glue CyA Eyeball everything good symmetry Sand whole fuselage including down right thrust Add platforms front edge strapping tape reinforcement CyA glue wicks well stufi make up pylons pins wing plat form etc Sand wing mounting unit contour glue yet Make drill nose plug may want spray IN STOCK FOR IMMEDIATE SHIPMENT NEW AH 6237 Cu in$19995 NewOoedre40CDII3-bOeniflgI$12995 Reg 0040 40 912266 Bnighelle flywheel 014295 Reg Ooede 40 Power Aeoenrbly Only$7195 OUAORA REPAIR81000 plo pertol Jin Me. ERCOUPEPLANS $2300 SEMI-KIT 99995 Jim Moeger TOMAHAWK PLANS $2290 SEMI-KIT $9996 Jin Menor6BALLTRPLANS $2395 SEMI-KIT$9995 Ji Meceer ACROBATPLANS 91996 SEMI-KIT $6996 MALONEY 100912996ZONOAH 939 $12995 SACHS-DOLMAR ai CDI 9637 CDI 96 FLOATS 49 114 onclc $2190 co,rplnte kit $4796 19WWIWHEELS 92696 PlKSpningStenton92490 PLANS SUPER STEARMAN 114 IGodfreyl$2999 113 TAYLORCRAFT 0112 CUB Nelite92995 Volkoplco 113 Chicken Charliol$2395 Servo H366 42 no $1296 Wonld 516 9 Ing wodele 93696 PROPS loll aicee Anger Top Flit Oynethnool 20% OFF US Onedre FUEL TANKS160066992300 9796 FIBERGLASS ARROW SHAFTS 911$ 023 long6/61196 24 Hoe Se.4nc 5250 penEege Seed Meek Cheek en Meey 0-do JIM MESSERS QUALITY MODEL PRODUCTS Valey View Dr Box 43 eany NY 14706 PRODUCTS Complete Line Exhaust Systems o Tuned Pipes0 Muffled Tuned Pipes o Headers * Venturi Mufflers o Expansion Mufflers 0 Helicopter Ball Mufflers ialized Exhaust Systems UnsurpaSJ WANNA RACE N RTH AST AREA BEGINNER RACES 0 nFORM-1 oFAI E Instructions Club Programs Information Contact NORTH EAST PYLON RACING ORGANIZATION m 119 DEAN AVE FRANKLIN MASS 02038 Tel 617 528-4043 203 673-2000 152 Model Aviation MODEL PRODUCTS CORP BOX 314 Pompton Plains NJ 07444 available write direct add S200 $500 outside US Covering assembly biggest stumbling blocks us locating lightweight covering materials After trying rejecting several fortunate locate non-modeling product have dubbed Skywrap weighs about 40% best tissue adheres either white glue RC56 shrinks under passive heat open oven door accepts spray dope color accents can drawn drafting ink etc quite strong puncture proof stuff commonly used supermarkets taking home veggies As plastics go amazing stuff sample roll am using Conoco North Carolina can find stuff dont afraid use am currently trying arrange supply unperforated unprinted lengths mail order sale Ordinary modeling tissue will work things carefully Finish off weak alcohol spray two thin coats plasti cized nitrate dope Krylon Crystal Clear tissue job will probably sag damp weather despair nature beast have used Skywrap no such problems will occur Either way try get smooth job Add usual AMA numbers identification label name address phone number big splat oolor left wing tip will help timer keep plane sight should have prop assembly finished put platforms etc Line up install vertical fin Mount stabilizer rubberbands put hunk DT fuse Strap wing pylons/platform unit Add prop assem bly front set up model over knife-edge surface balancing may need extra hands operation Nudge things around bit until correct balance point achieved pencil-mark pylons motor tube Hot Stuff wing mount place over marks Take few minutes admire finished product Check warps niisalignments Since purpose-built aircraft really will tolerate gross aberrations Carefully weigh whole unit taking note gram readout Mark figure down plane somewhere Trimming/flying Assuming airframe weight 55 60 grams beginning power should 12 strands of-in rubber approx 40 long Make up three motors Lube well let rest overnight Two should dried off broken wound breaking point sounds waste ful rubber batches vary greatlyeven within same batch Make note airplane max wind figure make deal yourselfto never exceed 90% figureeven going gold can credit George Perryman tip insist try some test glides motor installed prop folded thin shim will probably needed under rear stabilizeras much /16 looks appropriate crank 400 turns launch allowing model fly out hand wont ball fire point Stalls cured usual way add downthrust minor right thrust Hope fully altitude will gained prop will fold glide can observed Resist over-elevating ship wants go low slow take forever get clock prop rpm will get about 150 Add power bunches 100 winds shimming/trimming out unwanted ten dencies Eventually will have worked way up 1150 turns beast will come alive like proverbial butterfly proudly justifying its crafty competitive builder should can get emotional witnessing kinds aero delights ship strong enough flown zephyrs pushing eight knots own after point Changes Dawnwalker III starting place wish explore maximum Mulvihill performance Dawnwalker used sliced-rib alternate shown plans although flew very well flew August 1986 153 fuselage components light coat Krylon Crystal Clear B #1301 #1303 really necessaryand sand #400 paper EASY TO BUILD HANDCRAFTED KITS AT LOW PRICES 3g spanWeigni OsWing span s Wing span WeIght 4 lOs Length 53 inEngine 60 -90Length 45 inEngine 45 -60Length 48 inEngine 40 Kits include Pre-built fiberglass fuselage foam cores sheeted balsa machine cut balsa tail surfaces shaped strip ailerons complete hardware pack SEND CHECK OR MONEY ORDER TOVISA & MASTER CARD ACCEPTED W HORIZON MODELS INC T-404 Kelly Ave Manchester NH 03103 603 627-9503 indoors club meeting won trophy strong belch would throw off course terminal tail slide airfoil shown should very generally allow better penetration turbulence pro vide superior glide somewhat durable could increase mo tor tube length believe would appreciably enhance performance V-dihedral has tried have taller pylons neither added much except struc tural problems heart design low aspect ratio wing very slow prop/rubber combination opposed tra ditional out-of-sight climb/glide mode uppermost thought fun pursuit toward worthwhile goal uncon ventional point view hope build fly project will extract same pleasure did 154 Model Aviation CL Scale/Boss Continued page 68 patibility chart May 1985 column stiffened cloth will easier work will look much neater threads will straighter instead wavy squirrelly look cant avoid using standard application method item W Rozelle found Wing Tips Newsletter Mid-Hudson Mod elmasters courtesy SAM re printed Corsair Mini-contest report Roland Baltes San Pedro CA reports Southwestern Regionals held Buckeye AZ once seeing fair turnout CL Sport Scale event years event held January entry nine models four twin-engine types Weather good temperature Seventies wind minimum excellent day Scale flying Some months photos Roland Buckeye entries Roland commented nine entries may seem like much happening area hasnt seen Scale meet over year turnout nine considered fairly good Roland expects next years contest hopes able report another good increase activity Please send correspondenceand espe cially photosrelating CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 69 other maneuver Square Eight helped aft center gravity wind Because planes speed increase opens up corners tough keep maneuver right size As mentioned last month horse power maneuver strong engine will worth its weight gold maintaining line ten sion resisting speed increases hint havent great engine make maneuver tall narrow spend less time try ing penetrate wind wont perfect will able complete recogniza able Eight calm air move backwards during top horizontal leg thus allowing critical areas bottom corners intersectionto flown free wake turbulence Also avoid hit ting corners hard calm high drag results will sap airspeed horse power weak engine can run out steam long difficult Square Eight Whipping couple laps prior entry will build up little stored energy good air Vertical Eight quite easy can find cloud 450 use inter sections simply fly two perfect loops top other wind up becomes lot tougher way up never let fuselage get hori zontal intersection does will never get top loop round right size against wind Reverse control just before path airplane starts descend regardless its body angle Once get top consciously apply Down control maintain radius outside loop make intersection wind blows down exception rule never seeing body angle tangent intersection before reversing control Allow flight path just stop descending before giv ing Up complete Eight Try avoid non-pro look climbing inverted inter section relatively painless calm-air maneu ver step two just past intersection way up should enough Hourglass probably mistreated maneuvers almost fliers make same errors As Triangle first corner turned too far resulting climb angles far off fliers right second error often combination first mak ing top leg parallel bottom Both er rors result plane being position impossible complete maneu ver acceptably either front behind directly over head flier solution addition horsepower first error stop first corner just flying correct Triangle resulting climb steep slightly infl fl P55 PS flflPS PS PS PS PS S PS PS 4 VIDEO i Special Summer Rates June tbru August Only Rentals 1y 1195 Any 2 2300 All Tape Purchases 10% OFF - - Retail - 1 Basic Construction Beginners 107 Mm 49 95 42 Basic Flight Training Beginners 65 Mm44 95 3 World Model Aniarion 90 Mm 44 95 4 Oshkosh Onerviess 55Mm 3995 5Airplane Funnies 30 Mm39 95 61JS Scln Masters 60 Mm4195 Action 75 Mm 4995 dge Hoppin Vol 145 Mm 41 95 4 9 Which Wag Up 70 Mm 47954 K lOHedga Hoppin Vol 1140 Mm 4195 4 Rental Depositm Retail Price Tape 4 K Rental Dnratlnnm 7 Days After Del lueryK K Payment Chech 110 daysl MO Visa/M C Card # & 4 4 Eup Date Phone # C OD u Anailahle hy Phone4 K Shippingm 375 Foreign Canada Add 10% Total 4 4 Others 15% IL Res Add 7% Tan4 KAcademy AvIatIon R & D PO Boo 2774 4Hazel Crest IL 60428 335-07764 4.4
Edition: Model Aviation - 1986/08
Page Numbers: 64, 65, 66, 67, 152, 153, 154
The moment truth prototype builder Bob Langdon few milliseconds maiden flight Dawnwalker Ill rubber wound only400turns winds less ideal model clocked absolutely magnificent 330 prop leading edge profile clearly flaring under power burst efficient power utilization no-frills lightweight approach model also very evident THERE IS NOTHING NEW under sun True late Sixties George Perryman flying 2-oz Unlimited Rubber subsequently renamed Mulvihill ship featured 5-mm motor run fixed prop dethermalizing condenser paper covering Zaic three-view drawing notes pointed heavier regu lar version obviously would survive better competition Since time course have changes both AMA FF Rubber events emerging special contests suspect will eventually find place rule book intriguing what once named Meuser Marvelous Mulvi hill after innovative founder Robert B Meuser well known columnist/author/de signer aim probe ultimate Mulvihill performance through earlymorning dawn one-shot winner-take-all contest now rules simple foxy order eliminate occa sional Pennyplane F iD entry regular AMA Mulvihill rules applyplusthe model must have double-covered surfaces en closed motor airplane itself must weigh minimum 30 grams model rubber motor must weigh no less 60 grams Very challenging number such competitions have staged over past seven years notably US FF Championships Taft Robert P White Great Grand Gumbandito has pretty much dominated event remarkable times averaging 11 mm high 14 min airplane 80-gram version renowned Twin Fin represents current state art have great respect thought worthwhile broach alternate 1984 Reno Nats several San Diego Orbiteer crowd hunkered down over casino food sort dared other attempt indoor/outdoortype Mulvihill might eventually prove viable contender Dawn Flight events date four us Charlie Yost Robert Langdon Don McHugh author have built flown eight pre tenders task varying degrees success Weights have run 50 80 grams Fragility factor zero passable Langdon recorded high time 15 min 40 sec Otay Mesa test field intended withstand rigors midday com petition unlimited-type Mulvihill model designed early morning calm air has butterfly-like speed almost mesmerizing grace stretch near-nothing lift unbeliev able flight duration EJohn Oldenkamp 64 Model Aviation went across Mexican border retrieve has best results prop run 840 Dawnwalker prototype snapped wing dethermalizing Air loads collapsed McHughs new creation about 130 experiment unknowns have become public through pragmatism have extremely delightful deal work project progressed still experi menting model presented could starting point aspiring Mulvihill flier view very safe design rewards builder uncommon pleas ure Dawnwalker fact captured first place its first outing regular Mulvi eventwith no help pilot sent off downthrust shim omitted first flight absolutely majestic flight Given light non-thermal conditions will butterfly along approximately 150 rpm through prop run 5 8 mm depending trim air density settling heart stoppingly slow glide after prop folds ways clearly retrograde model acting like doing things really shouldnt days hightechery Left heart matter big thin highiy-pitched prop gives th Dawnwaiker series its punch Easy make sheet balsa thinned white glue props can-formed have soiderless hubs Foreground version fora model lii whiie background ver sions eariier sets Rubberbands earlierversions assist folding proved unneeeded Right Front end motortube reinforced strapping tape outside Also note notch forthe winding bar tube piatforms DT hardware weighed 176 gramstotal Left Wing mounting system strong lightweight Wili let motor tube distort winds piled up Straight-grain pylon sides may make some nervous work fine Add vertical pieces strength like Right Alternate sliced-rib wing construction want ultimate slow flier Prototype wing background used 36-in lengths leading edge stock weighed 13 grams August 1986 65 angaon aaaea extra semi-webbing wing tips stabilizersectionnot really necessary greatly improves strength Air loads alone will keep prop folded discovery process has answered some questions Lightweights need fly slowly once upset invariably go power stall speed up dash earth discouraging results tricky ground turbulence seem need inordinate amount power-robbing downthrust cure foregoing However given light air performance ab solutely astoundingly magnificent think will disappointed try Construction Target weight fin ished model less rubber motor 55 grams Selection materials very im portant thoughtful use glue Proper ly done will hit mark end up attractive reasonably robust machine Weigh everything ahead time good triple beam balance scale discard parts grossly overweight As guidelines balsa sheet weights about follows motor tube blank 345 x 36 95 grams rib sheet stock 3 x 36 Bgrain 12 grams wing leading edge LE trailing edge TE stock /32 x rams etc Some 6-lb stock actually stronger 10 12-lb stock depending grain makeup Propeller might want start unit since somewhat different norm blade outlines should cut laid up thinned white glue form similar plan No need soak blades Merely tape position separated wax paper set aside few days dry hub little block spruce cut drilled size relieved shaft front rubbed out Hot Stuff hardening prop folder stops glued after installation hangers last step photos should help explain Suffice say solderless hub unit comes out very light being strong enough task After prop blades dry should edge-sanded covered dope tissue bottom cut made inlet tubing carries hangers glued place cyanoacrylate CyA plywood cheeks put place Form hangers simple wire Ls test-fit tubing inlets Set blade pitch jig proper orientation tape hanger down 900 thrust line gob 5min epoxy will hold together Once both blades done mounted hub kept place short lengths tubing glued outer ends hangers well should have prop unit nominal 23 diameter 30 pitch hub spring washers target weight 12 14 grams Stabilizer/fin Build next Use wood sizes shown plan try go easy CyA glue Try avoid placing stress parts helping prevent unnecessary warping p / / / \ NI / j N AV / -I i /~A-. fin has internal basswood spar gets installed off plan after diagonals place stabilizer has light ribs external basswood spars vertical webbing leave out Uncovered weights 5 gram fm 18 grams stabilizer 25 grams both could tolerated Sand pieces well set aside covering Wing helpful line up pins locating LE TE good straightedge Pin pieces place plywood template cut out ribs Cut fit diagonally glue until polyhedral ribs also cut fit set proper angles method prepare angular templates polyhedral plan glue set ribs before adding anything else Left Wing structureatoentersection showsexternai spars webbing dlhedrai keeper iightweightgussetsasareoften seenon Indoor modeis Ribs medium-to-firm 1/16-in quarter-grain sheet Right internai spar diagonal components fin made basswood frame firm springy stock Giued cyanoacryiate very smaii drops covered weight wiii under 1 gram 66 Model Aviation Looking through supertransiucentSky wrap coverIng shows off functional design exceiient proportions highiy-speclallzed model Au pica author Full-Size Plans Available. See Page 162 2 '-~ 9 4 __e6 743& 4f / 2A~ a66 24 w -J z 0 Tip washout should shimmed indi cated As insurance actually crack TE douse CyA hold setting shims razor-planed contour can used over over Lastly add top external basswood spar Remove whole wing plan turn over gluing bottom spar Fudge vertical webbing shown glue place Air loads lightweight model demand use web bing leave out Sand everything cut panels apart prop up units install proper polyhedral After add ply brace center hogging out holes three center ribs insertion glue CyA uncovered wing should weigh 12 16 grams tape rubberbands Try get seam very straight should have cut sheet approx 06 wider indicated circumference x D et unit outside sun near benign heat source Under good conditions blank will take set dry about hour dry start wiggle blank bit make sure free mandrel may have slip card under seam free up once sure free time glue seam holding everything over paper bag over back lawn pulling tube off mandrel seam pointed down tack-glue inch As long pointed down CyA will bite Once off form set tube upright paper bag piece wax paper bottom run fat bead CyA down intended seam letting gravity work After squaring up ends sanding block install collars shown set aside boom similarly formed dope hot water should made Y32 A-grain sheet should either measured gore made pattern Form dry above tack-glue seam removed mandrel Cut glue circular bulkheads cram place long dowel dive bomb CyA glue keep place essential Continued page 152 Fuselage dislike making rolled-tube mo tor sticks unparalleled strength/weight bit bullet methods might lessen pain make convert plans call nominal dimensions based availability materials can buy good A-grain stock weighs nine 11 grams per 4-in-wide sheet means go larger diameter used closet rods lumberyard man drels withthe rear lOin orsotaperedwith razor plane form upward-tapering boom straight part sand out nice sheet balsa both sides dope side three times thinned-out ni trate dope Sand again dope has dried Hold blank undoped side up under bathroom shower about 30 sec water hot can get Try keep doped side dry fry thy hands Pat dry sort wrap/coax around mandrel Hold place masking August 1986 67 Superlight stabilizer platform dethermalizer system have proven reliable several authois previous models Hold-down hook fuse snuffer complete simple setup FF Duration/Murphy Continued page 149 have suddenly appeared everywhere again being listed $695but sale $591 mechanism seems somewhat smaller version last saw shelves however spring very strong can rigged up used fuel shutoff very satisfactorily wont attempt explain pet apparatus design harness mechanisms fuel shut-off use seems nearly Gas flier has own patented device conversion no means unique have something little different surefire functional would certainly interested relaying design readers Well its about time disappear two months well So see ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Indoor/Tenny Continued page 62 form twisted like prop blade will fit flat prop block Thus out line formed already properly curved twisted done outline should fitted block during construction moistened relieve stress twisting glued ribs spar after drying Note outline moistened after being tached ribs spar wood will ex pand stress whole structure Prop covering Prop blades should covered prop block possible Otherwise water saliva used adhesive cover trim prop return prop block until moisture has evaporated Also prop covered prop block film must slack enough blade lie film distortion blade twist - can changed during covering film will too tight let blade resume normal twist stress Another important tactic sure film attached both outline ribs accomplishes three things First mois ture used adhesive entire blade ex pands evenly minimizing stress Second individual panels film small enough stiffen blade Finally damage film single section wont spread other sections Dont worry about wrinkles appear blades dry out simple operation will remove Use very fine artist brush moistened water work out wrinkles Stroke brush along wrinkle will pull up level film around After wrinkles treated let whole assembly dry again Finally store prop holder keeps blades touching anything Prop InnovatIons number different plastic props available photos shows convert efficient pusher operation Peanut Scale models free wheeling ratchet front trimmed flat make bearing surface shaft pro jected through hub bent over push against blade Al Backstrom flew setup Bedford Boys Ranch Bedford TX Another photo shows same basic prop hub Photo 1 case small plastic blades removed much larger balsa blades substituted model Profile Scale model flown Randy Randolph again Bedford Boys Ranch Novice Pennyplane has rule limiting prop diameter handle power three-gram model needs Jim Clem trying very wide blades 2Y-in wide blade six inches long shaft tip Ill report performance soon can get some numbers Next time prop blocks prop-covering techniques Bud Tenny Box 545 Richardson TX 75080 Dawnwalker/Oldenkafl1P Continued page 67 maintain rigidity aft motor peg form mount DT tube platforms etc True up main joint slide boom over aft motor hard collar glue works together white glue CyA Eyeball everything good symmetry Sand whole fuselage including down right thrust Add platforms front edge strapping tape reinforcement CyA glue wicks well stufi make up pylons pins wing plat form etc Sand wing mounting unit contour glue yet Make drill nose plug may want spray IN STOCK FOR IMMEDIATE SHIPMENT NEW AH 6237 Cu in$19995 NewOoedre40CDII3-bOeniflgI$12995 Reg 0040 40 912266 Bnighelle flywheel 014295 Reg Ooede 40 Power Aeoenrbly Only$7195 OUAORA REPAIR81000 plo pertol Jin Me. ERCOUPEPLANS $2300 SEMI-KIT 99995 Jim Moeger TOMAHAWK PLANS $2290 SEMI-KIT $9996 Jin Menor6BALLTRPLANS $2395 SEMI-KIT$9995 Ji Meceer ACROBATPLANS 91996 SEMI-KIT $6996 MALONEY 100912996ZONOAH 939 $12995 SACHS-DOLMAR ai CDI 9637 CDI 96 FLOATS 49 114 onclc $2190 co,rplnte kit $4796 19WWIWHEELS 92696 PlKSpningStenton92490 PLANS SUPER STEARMAN 114 IGodfreyl$2999 113 TAYLORCRAFT 0112 CUB Nelite92995 Volkoplco 113 Chicken Charliol$2395 Servo H366 42 no $1296 Wonld 516 9 Ing wodele 93696 PROPS loll aicee Anger Top Flit Oynethnool 20% OFF US Onedre FUEL TANKS160066992300 9796 FIBERGLASS ARROW SHAFTS 911$ 023 long6/61196 24 Hoe Se.4nc 5250 penEege Seed Meek Cheek en Meey 0-do JIM MESSERS QUALITY MODEL PRODUCTS Valey View Dr Box 43 eany NY 14706 PRODUCTS Complete Line Exhaust Systems o Tuned Pipes0 Muffled Tuned Pipes o Headers * Venturi Mufflers o Expansion Mufflers 0 Helicopter Ball Mufflers ialized Exhaust Systems UnsurpaSJ WANNA RACE N RTH AST AREA BEGINNER RACES 0 nFORM-1 oFAI E Instructions Club Programs Information Contact NORTH EAST PYLON RACING ORGANIZATION m 119 DEAN AVE FRANKLIN MASS 02038 Tel 617 528-4043 203 673-2000 152 Model Aviation MODEL PRODUCTS CORP BOX 314 Pompton Plains NJ 07444 available write direct add S200 $500 outside US Covering assembly biggest stumbling blocks us locating lightweight covering materials After trying rejecting several fortunate locate non-modeling product have dubbed Skywrap weighs about 40% best tissue adheres either white glue RC56 shrinks under passive heat open oven door accepts spray dope color accents can drawn drafting ink etc quite strong puncture proof stuff commonly used supermarkets taking home veggies As plastics go amazing stuff sample roll am using Conoco North Carolina can find stuff dont afraid use am currently trying arrange supply unperforated unprinted lengths mail order sale Ordinary modeling tissue will work things carefully Finish off weak alcohol spray two thin coats plasti cized nitrate dope Krylon Crystal Clear tissue job will probably sag damp weather despair nature beast have used Skywrap no such problems will occur Either way try get smooth job Add usual AMA numbers identification label name address phone number big splat oolor left wing tip will help timer keep plane sight should have prop assembly finished put platforms etc Line up install vertical fin Mount stabilizer rubberbands put hunk DT fuse Strap wing pylons/platform unit Add prop assem bly front set up model over knife-edge surface balancing may need extra hands operation Nudge things around bit until correct balance point achieved pencil-mark pylons motor tube Hot Stuff wing mount place over marks Take few minutes admire finished product Check warps niisalignments Since purpose-built aircraft really will tolerate gross aberrations Carefully weigh whole unit taking note gram readout Mark figure down plane somewhere Trimming/flying Assuming airframe weight 55 60 grams beginning power should 12 strands of-in rubber approx 40 long Make up three motors Lube well let rest overnight Two should dried off broken wound breaking point sounds waste ful rubber batches vary greatlyeven within same batch Make note airplane max wind figure make deal yourselfto never exceed 90% figureeven going gold can credit George Perryman tip insist try some test glides motor installed prop folded thin shim will probably needed under rear stabilizeras much /16 looks appropriate crank 400 turns launch allowing model fly out hand wont ball fire point Stalls cured usual way add downthrust minor right thrust Hope fully altitude will gained prop will fold glide can observed Resist over-elevating ship wants go low slow take forever get clock prop rpm will get about 150 Add power bunches 100 winds shimming/trimming out unwanted ten dencies Eventually will have worked way up 1150 turns beast will come alive like proverbial butterfly proudly justifying its crafty competitive builder should can get emotional witnessing kinds aero delights ship strong enough flown zephyrs pushing eight knots own after point Changes Dawnwalker III starting place wish explore maximum Mulvihill performance Dawnwalker used sliced-rib alternate shown plans although flew very well flew August 1986 153 fuselage components light coat Krylon Crystal Clear B #1301 #1303 really necessaryand sand #400 paper EASY TO BUILD HANDCRAFTED KITS AT LOW PRICES 3g spanWeigni OsWing span s Wing span WeIght 4 lOs Length 53 inEngine 60 -90Length 45 inEngine 45 -60Length 48 inEngine 40 Kits include Pre-built fiberglass fuselage foam cores sheeted balsa machine cut balsa tail surfaces shaped strip ailerons complete hardware pack SEND CHECK OR MONEY ORDER TOVISA & MASTER CARD ACCEPTED W HORIZON MODELS INC T-404 Kelly Ave Manchester NH 03103 603 627-9503 indoors club meeting won trophy strong belch would throw off course terminal tail slide airfoil shown should very generally allow better penetration turbulence pro vide superior glide somewhat durable could increase mo tor tube length believe would appreciably enhance performance V-dihedral has tried have taller pylons neither added much except struc tural problems heart design low aspect ratio wing very slow prop/rubber combination opposed tra ditional out-of-sight climb/glide mode uppermost thought fun pursuit toward worthwhile goal uncon ventional point view hope build fly project will extract same pleasure did 154 Model Aviation CL Scale/Boss Continued page 68 patibility chart May 1985 column stiffened cloth will easier work will look much neater threads will straighter instead wavy squirrelly look cant avoid using standard application method item W Rozelle found Wing Tips Newsletter Mid-Hudson Mod elmasters courtesy SAM re printed Corsair Mini-contest report Roland Baltes San Pedro CA reports Southwestern Regionals held Buckeye AZ once seeing fair turnout CL Sport Scale event years event held January entry nine models four twin-engine types Weather good temperature Seventies wind minimum excellent day Scale flying Some months photos Roland Buckeye entries Roland commented nine entries may seem like much happening area hasnt seen Scale meet over year turnout nine considered fairly good Roland expects next years contest hopes able report another good increase activity Please send correspondenceand espe cially photosrelating CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 69 other maneuver Square Eight helped aft center gravity wind Because planes speed increase opens up corners tough keep maneuver right size As mentioned last month horse power maneuver strong engine will worth its weight gold maintaining line ten sion resisting speed increases hint havent great engine make maneuver tall narrow spend less time try ing penetrate wind wont perfect will able complete recogniza able Eight calm air move backwards during top horizontal leg thus allowing critical areas bottom corners intersectionto flown free wake turbulence Also avoid hit ting corners hard calm high drag results will sap airspeed horse power weak engine can run out steam long difficult Square Eight Whipping couple laps prior entry will build up little stored energy good air Vertical Eight quite easy can find cloud 450 use inter sections simply fly two perfect loops top other wind up becomes lot tougher way up never let fuselage get hori zontal intersection does will never get top loop round right size against wind Reverse control just before path airplane starts descend regardless its body angle Once get top consciously apply Down control maintain radius outside loop make intersection wind blows down exception rule never seeing body angle tangent intersection before reversing control Allow flight path just stop descending before giv ing Up complete Eight Try avoid non-pro look climbing inverted inter section relatively painless calm-air maneu ver step two just past intersection way up should enough Hourglass probably mistreated maneuvers almost fliers make same errors As Triangle first corner turned too far resulting climb angles far off fliers right second error often combination first mak ing top leg parallel bottom Both er rors result plane being position impossible complete maneu ver acceptably either front behind directly over head flier solution addition horsepower first error stop first corner just flying correct Triangle resulting climb steep slightly infl fl P55 PS flflPS PS PS PS PS S PS PS 4 VIDEO i Special Summer Rates June tbru August Only Rentals 1y 1195 Any 2 2300 All Tape Purchases 10% OFF - - Retail - 1 Basic Construction Beginners 107 Mm 49 95 42 Basic Flight Training Beginners 65 Mm44 95 3 World Model Aniarion 90 Mm 44 95 4 Oshkosh Onerviess 55Mm 3995 5Airplane Funnies 30 Mm39 95 61JS Scln Masters 60 Mm4195 Action 75 Mm 4995 dge Hoppin Vol 145 Mm 41 95 4 9 Which Wag Up 70 Mm 47954 K lOHedga Hoppin Vol 1140 Mm 4195 4 Rental Depositm Retail Price Tape 4 K Rental Dnratlnnm 7 Days After Del lueryK K Payment Chech 110 daysl MO Visa/M C Card # & 4 4 Eup Date Phone # C OD u Anailahle hy Phone4 K Shippingm 375 Foreign Canada Add 10% Total 4 4 Others 15% IL Res Add 7% Tan4 KAcademy AvIatIon R & D PO Boo 2774 4Hazel Crest IL 60428 335-07764 4.4
Edition: Model Aviation - 1986/08
Page Numbers: 64, 65, 66, 67, 152, 153, 154
The moment truth prototype builder Bob Langdon few milliseconds maiden flight Dawnwalker Ill rubber wound only400turns winds less ideal model clocked absolutely magnificent 330 prop leading edge profile clearly flaring under power burst efficient power utilization no-frills lightweight approach model also very evident THERE IS NOTHING NEW under sun True late Sixties George Perryman flying 2-oz Unlimited Rubber subsequently renamed Mulvihill ship featured 5-mm motor run fixed prop dethermalizing condenser paper covering Zaic three-view drawing notes pointed heavier regu lar version obviously would survive better competition Since time course have changes both AMA FF Rubber events emerging special contests suspect will eventually find place rule book intriguing what once named Meuser Marvelous Mulvi hill after innovative founder Robert B Meuser well known columnist/author/de signer aim probe ultimate Mulvihill performance through earlymorning dawn one-shot winner-take-all contest now rules simple foxy order eliminate occa sional Pennyplane F iD entry regular AMA Mulvihill rules applyplusthe model must have double-covered surfaces en closed motor airplane itself must weigh minimum 30 grams model rubber motor must weigh no less 60 grams Very challenging number such competitions have staged over past seven years notably US FF Championships Taft Robert P White Great Grand Gumbandito has pretty much dominated event remarkable times averaging 11 mm high 14 min airplane 80-gram version renowned Twin Fin represents current state art have great respect thought worthwhile broach alternate 1984 Reno Nats several San Diego Orbiteer crowd hunkered down over casino food sort dared other attempt indoor/outdoortype Mulvihill might eventually prove viable contender Dawn Flight events date four us Charlie Yost Robert Langdon Don McHugh author have built flown eight pre tenders task varying degrees success Weights have run 50 80 grams Fragility factor zero passable Langdon recorded high time 15 min 40 sec Otay Mesa test field intended withstand rigors midday com petition unlimited-type Mulvihill model designed early morning calm air has butterfly-like speed almost mesmerizing grace stretch near-nothing lift unbeliev able flight duration EJohn Oldenkamp 64 Model Aviation went across Mexican border retrieve has best results prop run 840 Dawnwalker prototype snapped wing dethermalizing Air loads collapsed McHughs new creation about 130 experiment unknowns have become public through pragmatism have extremely delightful deal work project progressed still experi menting model presented could starting point aspiring Mulvihill flier view very safe design rewards builder uncommon pleas ure Dawnwalker fact captured first place its first outing regular Mulvi eventwith no help pilot sent off downthrust shim omitted first flight absolutely majestic flight Given light non-thermal conditions will butterfly along approximately 150 rpm through prop run 5 8 mm depending trim air density settling heart stoppingly slow glide after prop folds ways clearly retrograde model acting like doing things really shouldnt days hightechery Left heart matter big thin highiy-pitched prop gives th Dawnwaiker series its punch Easy make sheet balsa thinned white glue props can-formed have soiderless hubs Foreground version fora model lii whiie background ver sions eariier sets Rubberbands earlierversions assist folding proved unneeeded Right Front end motortube reinforced strapping tape outside Also note notch forthe winding bar tube piatforms DT hardware weighed 176 gramstotal Left Wing mounting system strong lightweight Wili let motor tube distort winds piled up Straight-grain pylon sides may make some nervous work fine Add vertical pieces strength like Right Alternate sliced-rib wing construction want ultimate slow flier Prototype wing background used 36-in lengths leading edge stock weighed 13 grams August 1986 65 angaon aaaea extra semi-webbing wing tips stabilizersectionnot really necessary greatly improves strength Air loads alone will keep prop folded discovery process has answered some questions Lightweights need fly slowly once upset invariably go power stall speed up dash earth discouraging results tricky ground turbulence seem need inordinate amount power-robbing downthrust cure foregoing However given light air performance ab solutely astoundingly magnificent think will disappointed try Construction Target weight fin ished model less rubber motor 55 grams Selection materials very im portant thoughtful use glue Proper ly done will hit mark end up attractive reasonably robust machine Weigh everything ahead time good triple beam balance scale discard parts grossly overweight As guidelines balsa sheet weights about follows motor tube blank 345 x 36 95 grams rib sheet stock 3 x 36 Bgrain 12 grams wing leading edge LE trailing edge TE stock /32 x rams etc Some 6-lb stock actually stronger 10 12-lb stock depending grain makeup Propeller might want start unit since somewhat different norm blade outlines should cut laid up thinned white glue form similar plan No need soak blades Merely tape position separated wax paper set aside few days dry hub little block spruce cut drilled size relieved shaft front rubbed out Hot Stuff hardening prop folder stops glued after installation hangers last step photos should help explain Suffice say solderless hub unit comes out very light being strong enough task After prop blades dry should edge-sanded covered dope tissue bottom cut made inlet tubing carries hangers glued place cyanoacrylate CyA plywood cheeks put place Form hangers simple wire Ls test-fit tubing inlets Set blade pitch jig proper orientation tape hanger down 900 thrust line gob 5min epoxy will hold together Once both blades done mounted hub kept place short lengths tubing glued outer ends hangers well should have prop unit nominal 23 diameter 30 pitch hub spring washers target weight 12 14 grams Stabilizer/fin Build next Use wood sizes shown plan try go easy CyA glue Try avoid placing stress parts helping prevent unnecessary warping p / / / \ NI / j N AV / -I i /~A-. fin has internal basswood spar gets installed off plan after diagonals place stabilizer has light ribs external basswood spars vertical webbing leave out Uncovered weights 5 gram fm 18 grams stabilizer 25 grams both could tolerated Sand pieces well set aside covering Wing helpful line up pins locating LE TE good straightedge Pin pieces place plywood template cut out ribs Cut fit diagonally glue until polyhedral ribs also cut fit set proper angles method prepare angular templates polyhedral plan glue set ribs before adding anything else Left Wing structureatoentersection showsexternai spars webbing dlhedrai keeper iightweightgussetsasareoften seenon Indoor modeis Ribs medium-to-firm 1/16-in quarter-grain sheet Right internai spar diagonal components fin made basswood frame firm springy stock Giued cyanoacryiate very smaii drops covered weight wiii under 1 gram 66 Model Aviation Looking through supertransiucentSky wrap coverIng shows off functional design exceiient proportions highiy-speclallzed model Au pica author Full-Size Plans Available. See Page 162 2 '-~ 9 4 __e6 743& 4f / 2A~ a66 24 w -J z 0 Tip washout should shimmed indi cated As insurance actually crack TE douse CyA hold setting shims razor-planed contour can used over over Lastly add top external basswood spar Remove whole wing plan turn over gluing bottom spar Fudge vertical webbing shown glue place Air loads lightweight model demand use web bing leave out Sand everything cut panels apart prop up units install proper polyhedral After add ply brace center hogging out holes three center ribs insertion glue CyA uncovered wing should weigh 12 16 grams tape rubberbands Try get seam very straight should have cut sheet approx 06 wider indicated circumference x D et unit outside sun near benign heat source Under good conditions blank will take set dry about hour dry start wiggle blank bit make sure free mandrel may have slip card under seam free up once sure free time glue seam holding everything over paper bag over back lawn pulling tube off mandrel seam pointed down tack-glue inch As long pointed down CyA will bite Once off form set tube upright paper bag piece wax paper bottom run fat bead CyA down intended seam letting gravity work After squaring up ends sanding block install collars shown set aside boom similarly formed dope hot water should made Y32 A-grain sheet should either measured gore made pattern Form dry above tack-glue seam removed mandrel Cut glue circular bulkheads cram place long dowel dive bomb CyA glue keep place essential Continued page 152 Fuselage dislike making rolled-tube mo tor sticks unparalleled strength/weight bit bullet methods might lessen pain make convert plans call nominal dimensions based availability materials can buy good A-grain stock weighs nine 11 grams per 4-in-wide sheet means go larger diameter used closet rods lumberyard man drels withthe rear lOin orsotaperedwith razor plane form upward-tapering boom straight part sand out nice sheet balsa both sides dope side three times thinned-out ni trate dope Sand again dope has dried Hold blank undoped side up under bathroom shower about 30 sec water hot can get Try keep doped side dry fry thy hands Pat dry sort wrap/coax around mandrel Hold place masking August 1986 67 Superlight stabilizer platform dethermalizer system have proven reliable several authois previous models Hold-down hook fuse snuffer complete simple setup FF Duration/Murphy Continued page 149 have suddenly appeared everywhere again being listed $695but sale $591 mechanism seems somewhat smaller version last saw shelves however spring very strong can rigged up used fuel shutoff very satisfactorily wont attempt explain pet apparatus design harness mechanisms fuel shut-off use seems nearly Gas flier has own patented device conversion no means unique have something little different surefire functional would certainly interested relaying design readers Well its about time disappear two months well So see ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Indoor/Tenny Continued page 62 form twisted like prop blade will fit flat prop block Thus out line formed already properly curved twisted done outline should fitted block during construction moistened relieve stress twisting glued ribs spar after drying Note outline moistened after being tached ribs spar wood will ex pand stress whole structure Prop covering Prop blades should covered prop block possible Otherwise water saliva used adhesive cover trim prop return prop block until moisture has evaporated Also prop covered prop block film must slack enough blade lie film distortion blade twist - can changed during covering film will too tight let blade resume normal twist stress Another important tactic sure film attached both outline ribs accomplishes three things First mois ture used adhesive entire blade ex pands evenly minimizing stress Second individual panels film small enough stiffen blade Finally damage film single section wont spread other sections Dont worry about wrinkles appear blades dry out simple operation will remove Use very fine artist brush moistened water work out wrinkles Stroke brush along wrinkle will pull up level film around After wrinkles treated let whole assembly dry again Finally store prop holder keeps blades touching anything Prop InnovatIons number different plastic props available photos shows convert efficient pusher operation Peanut Scale models free wheeling ratchet front trimmed flat make bearing surface shaft pro jected through hub bent over push against blade Al Backstrom flew setup Bedford Boys Ranch Bedford TX Another photo shows same basic prop hub Photo 1 case small plastic blades removed much larger balsa blades substituted model Profile Scale model flown Randy Randolph again Bedford Boys Ranch Novice Pennyplane has rule limiting prop diameter handle power three-gram model needs Jim Clem trying very wide blades 2Y-in wide blade six inches long shaft tip Ill report performance soon can get some numbers Next time prop blocks prop-covering techniques Bud Tenny Box 545 Richardson TX 75080 Dawnwalker/Oldenkafl1P Continued page 67 maintain rigidity aft motor peg form mount DT tube platforms etc True up main joint slide boom over aft motor hard collar glue works together white glue CyA Eyeball everything good symmetry Sand whole fuselage including down right thrust Add platforms front edge strapping tape reinforcement CyA glue wicks well stufi make up pylons pins wing plat form etc Sand wing mounting unit contour glue yet Make drill nose plug may want spray IN STOCK FOR IMMEDIATE SHIPMENT NEW AH 6237 Cu in$19995 NewOoedre40CDII3-bOeniflgI$12995 Reg 0040 40 912266 Bnighelle flywheel 014295 Reg Ooede 40 Power Aeoenrbly Only$7195 OUAORA REPAIR81000 plo pertol Jin Me. ERCOUPEPLANS $2300 SEMI-KIT 99995 Jim Moeger TOMAHAWK PLANS $2290 SEMI-KIT $9996 Jin Menor6BALLTRPLANS $2395 SEMI-KIT$9995 Ji Meceer ACROBATPLANS 91996 SEMI-KIT $6996 MALONEY 100912996ZONOAH 939 $12995 SACHS-DOLMAR ai CDI 9637 CDI 96 FLOATS 49 114 onclc $2190 co,rplnte kit $4796 19WWIWHEELS 92696 PlKSpningStenton92490 PLANS SUPER STEARMAN 114 IGodfreyl$2999 113 TAYLORCRAFT 0112 CUB Nelite92995 Volkoplco 113 Chicken Charliol$2395 Servo H366 42 no $1296 Wonld 516 9 Ing wodele 93696 PROPS loll aicee Anger Top Flit Oynethnool 20% OFF US Onedre FUEL TANKS160066992300 9796 FIBERGLASS ARROW SHAFTS 911$ 023 long6/61196 24 Hoe Se.4nc 5250 penEege Seed Meek Cheek en Meey 0-do JIM MESSERS QUALITY MODEL PRODUCTS Valey View Dr Box 43 eany NY 14706 PRODUCTS Complete Line Exhaust Systems o Tuned Pipes0 Muffled Tuned Pipes o Headers * Venturi Mufflers o Expansion Mufflers 0 Helicopter Ball Mufflers ialized Exhaust Systems UnsurpaSJ WANNA RACE N RTH AST AREA BEGINNER RACES 0 nFORM-1 oFAI E Instructions Club Programs Information Contact NORTH EAST PYLON RACING ORGANIZATION m 119 DEAN AVE FRANKLIN MASS 02038 Tel 617 528-4043 203 673-2000 152 Model Aviation MODEL PRODUCTS CORP BOX 314 Pompton Plains NJ 07444 available write direct add S200 $500 outside US Covering assembly biggest stumbling blocks us locating lightweight covering materials After trying rejecting several fortunate locate non-modeling product have dubbed Skywrap weighs about 40% best tissue adheres either white glue RC56 shrinks under passive heat open oven door accepts spray dope color accents can drawn drafting ink etc quite strong puncture proof stuff commonly used supermarkets taking home veggies As plastics go amazing stuff sample roll am using Conoco North Carolina can find stuff dont afraid use am currently trying arrange supply unperforated unprinted lengths mail order sale Ordinary modeling tissue will work things carefully Finish off weak alcohol spray two thin coats plasti cized nitrate dope Krylon Crystal Clear tissue job will probably sag damp weather despair nature beast have used Skywrap no such problems will occur Either way try get smooth job Add usual AMA numbers identification label name address phone number big splat oolor left wing tip will help timer keep plane sight should have prop assembly finished put platforms etc Line up install vertical fin Mount stabilizer rubberbands put hunk DT fuse Strap wing pylons/platform unit Add prop assem bly front set up model over knife-edge surface balancing may need extra hands operation Nudge things around bit until correct balance point achieved pencil-mark pylons motor tube Hot Stuff wing mount place over marks Take few minutes admire finished product Check warps niisalignments Since purpose-built aircraft really will tolerate gross aberrations Carefully weigh whole unit taking note gram readout Mark figure down plane somewhere Trimming/flying Assuming airframe weight 55 60 grams beginning power should 12 strands of-in rubber approx 40 long Make up three motors Lube well let rest overnight Two should dried off broken wound breaking point sounds waste ful rubber batches vary greatlyeven within same batch Make note airplane max wind figure make deal yourselfto never exceed 90% figureeven going gold can credit George Perryman tip insist try some test glides motor installed prop folded thin shim will probably needed under rear stabilizeras much /16 looks appropriate crank 400 turns launch allowing model fly out hand wont ball fire point Stalls cured usual way add downthrust minor right thrust Hope fully altitude will gained prop will fold glide can observed Resist over-elevating ship wants go low slow take forever get clock prop rpm will get about 150 Add power bunches 100 winds shimming/trimming out unwanted ten dencies Eventually will have worked way up 1150 turns beast will come alive like proverbial butterfly proudly justifying its crafty competitive builder should can get emotional witnessing kinds aero delights ship strong enough flown zephyrs pushing eight knots own after point Changes Dawnwalker III starting place wish explore maximum Mulvihill performance Dawnwalker used sliced-rib alternate shown plans although flew very well flew August 1986 153 fuselage components light coat Krylon Crystal Clear B #1301 #1303 really necessaryand sand #400 paper EASY TO BUILD HANDCRAFTED KITS AT LOW PRICES 3g spanWeigni OsWing span s Wing span WeIght 4 lOs Length 53 inEngine 60 -90Length 45 inEngine 45 -60Length 48 inEngine 40 Kits include Pre-built fiberglass fuselage foam cores sheeted balsa machine cut balsa tail surfaces shaped strip ailerons complete hardware pack SEND CHECK OR MONEY ORDER TOVISA & MASTER CARD ACCEPTED W HORIZON MODELS INC T-404 Kelly Ave Manchester NH 03103 603 627-9503 indoors club meeting won trophy strong belch would throw off course terminal tail slide airfoil shown should very generally allow better penetration turbulence pro vide superior glide somewhat durable could increase mo tor tube length believe would appreciably enhance performance V-dihedral has tried have taller pylons neither added much except struc tural problems heart design low aspect ratio wing very slow prop/rubber combination opposed tra ditional out-of-sight climb/glide mode uppermost thought fun pursuit toward worthwhile goal uncon ventional point view hope build fly project will extract same pleasure did 154 Model Aviation CL Scale/Boss Continued page 68 patibility chart May 1985 column stiffened cloth will easier work will look much neater threads will straighter instead wavy squirrelly look cant avoid using standard application method item W Rozelle found Wing Tips Newsletter Mid-Hudson Mod elmasters courtesy SAM re printed Corsair Mini-contest report Roland Baltes San Pedro CA reports Southwestern Regionals held Buckeye AZ once seeing fair turnout CL Sport Scale event years event held January entry nine models four twin-engine types Weather good temperature Seventies wind minimum excellent day Scale flying Some months photos Roland Buckeye entries Roland commented nine entries may seem like much happening area hasnt seen Scale meet over year turnout nine considered fairly good Roland expects next years contest hopes able report another good increase activity Please send correspondenceand espe cially photosrelating CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 69 other maneuver Square Eight helped aft center gravity wind Because planes speed increase opens up corners tough keep maneuver right size As mentioned last month horse power maneuver strong engine will worth its weight gold maintaining line ten sion resisting speed increases hint havent great engine make maneuver tall narrow spend less time try ing penetrate wind wont perfect will able complete recogniza able Eight calm air move backwards during top horizontal leg thus allowing critical areas bottom corners intersectionto flown free wake turbulence Also avoid hit ting corners hard calm high drag results will sap airspeed horse power weak engine can run out steam long difficult Square Eight Whipping couple laps prior entry will build up little stored energy good air Vertical Eight quite easy can find cloud 450 use inter sections simply fly two perfect loops top other wind up becomes lot tougher way up never let fuselage get hori zontal intersection does will never get top loop round right size against wind Reverse control just before path airplane starts descend regardless its body angle Once get top consciously apply Down control maintain radius outside loop make intersection wind blows down exception rule never seeing body angle tangent intersection before reversing control Allow flight path just stop descending before giv ing Up complete Eight Try avoid non-pro look climbing inverted inter section relatively painless calm-air maneu ver step two just past intersection way up should enough Hourglass probably mistreated maneuvers almost fliers make same errors As Triangle first corner turned too far resulting climb angles far off fliers right second error often combination first mak ing top leg parallel bottom Both er rors result plane being position impossible complete maneu ver acceptably either front behind directly over head flier solution addition horsepower first error stop first corner just flying correct Triangle resulting climb steep slightly infl fl P55 PS flflPS PS PS PS PS S PS PS 4 VIDEO i Special Summer Rates June tbru August Only Rentals 1y 1195 Any 2 2300 All Tape Purchases 10% OFF - - Retail - 1 Basic Construction Beginners 107 Mm 49 95 42 Basic Flight Training Beginners 65 Mm44 95 3 World Model Aniarion 90 Mm 44 95 4 Oshkosh Onerviess 55Mm 3995 5Airplane Funnies 30 Mm39 95 61JS Scln Masters 60 Mm4195 Action 75 Mm 4995 dge Hoppin Vol 145 Mm 41 95 4 9 Which Wag Up 70 Mm 47954 K lOHedga Hoppin Vol 1140 Mm 4195 4 Rental Depositm Retail Price Tape 4 K Rental Dnratlnnm 7 Days After Del lueryK K Payment Chech 110 daysl MO Visa/M C Card # & 4 4 Eup Date Phone # C OD u Anailahle hy Phone4 K Shippingm 375 Foreign Canada Add 10% Total 4 4 Others 15% IL Res Add 7% Tan4 KAcademy AvIatIon R & D PO Boo 2774 4Hazel Crest IL 60428 335-07764 4.4
Edition: Model Aviation - 1986/08
Page Numbers: 64, 65, 66, 67, 152, 153, 154
The moment truth prototype builder Bob Langdon few milliseconds maiden flight Dawnwalker Ill rubber wound only400turns winds less ideal model clocked absolutely magnificent 330 prop leading edge profile clearly flaring under power burst efficient power utilization no-frills lightweight approach model also very evident THERE IS NOTHING NEW under sun True late Sixties George Perryman flying 2-oz Unlimited Rubber subsequently renamed Mulvihill ship featured 5-mm motor run fixed prop dethermalizing condenser paper covering Zaic three-view drawing notes pointed heavier regu lar version obviously would survive better competition Since time course have changes both AMA FF Rubber events emerging special contests suspect will eventually find place rule book intriguing what once named Meuser Marvelous Mulvi hill after innovative founder Robert B Meuser well known columnist/author/de signer aim probe ultimate Mulvihill performance through earlymorning dawn one-shot winner-take-all contest now rules simple foxy order eliminate occa sional Pennyplane F iD entry regular AMA Mulvihill rules applyplusthe model must have double-covered surfaces en closed motor airplane itself must weigh minimum 30 grams model rubber motor must weigh no less 60 grams Very challenging number such competitions have staged over past seven years notably US FF Championships Taft Robert P White Great Grand Gumbandito has pretty much dominated event remarkable times averaging 11 mm high 14 min airplane 80-gram version renowned Twin Fin represents current state art have great respect thought worthwhile broach alternate 1984 Reno Nats several San Diego Orbiteer crowd hunkered down over casino food sort dared other attempt indoor/outdoortype Mulvihill might eventually prove viable contender Dawn Flight events date four us Charlie Yost Robert Langdon Don McHugh author have built flown eight pre tenders task varying degrees success Weights have run 50 80 grams Fragility factor zero passable Langdon recorded high time 15 min 40 sec Otay Mesa test field intended withstand rigors midday com petition unlimited-type Mulvihill model designed early morning calm air has butterfly-like speed almost mesmerizing grace stretch near-nothing lift unbeliev able flight duration EJohn Oldenkamp 64 Model Aviation went across Mexican border retrieve has best results prop run 840 Dawnwalker prototype snapped wing dethermalizing Air loads collapsed McHughs new creation about 130 experiment unknowns have become public through pragmatism have extremely delightful deal work project progressed still experi menting model presented could starting point aspiring Mulvihill flier view very safe design rewards builder uncommon pleas ure Dawnwalker fact captured first place its first outing regular Mulvi eventwith no help pilot sent off downthrust shim omitted first flight absolutely majestic flight Given light non-thermal conditions will butterfly along approximately 150 rpm through prop run 5 8 mm depending trim air density settling heart stoppingly slow glide after prop folds ways clearly retrograde model acting like doing things really shouldnt days hightechery Left heart matter big thin highiy-pitched prop gives th Dawnwaiker series its punch Easy make sheet balsa thinned white glue props can-formed have soiderless hubs Foreground version fora model lii whiie background ver sions eariier sets Rubberbands earlierversions assist folding proved unneeeded Right Front end motortube reinforced strapping tape outside Also note notch forthe winding bar tube piatforms DT hardware weighed 176 gramstotal Left Wing mounting system strong lightweight Wili let motor tube distort winds piled up Straight-grain pylon sides may make some nervous work fine Add vertical pieces strength like Right Alternate sliced-rib wing construction want ultimate slow flier Prototype wing background used 36-in lengths leading edge stock weighed 13 grams August 1986 65 angaon aaaea extra semi-webbing wing tips stabilizersectionnot really necessary greatly improves strength Air loads alone will keep prop folded discovery process has answered some questions Lightweights need fly slowly once upset invariably go power stall speed up dash earth discouraging results tricky ground turbulence seem need inordinate amount power-robbing downthrust cure foregoing However given light air performance ab solutely astoundingly magnificent think will disappointed try Construction Target weight fin ished model less rubber motor 55 grams Selection materials very im portant thoughtful use glue Proper ly done will hit mark end up attractive reasonably robust machine Weigh everything ahead time good triple beam balance scale discard parts grossly overweight As guidelines balsa sheet weights about follows motor tube blank 345 x 36 95 grams rib sheet stock 3 x 36 Bgrain 12 grams wing leading edge LE trailing edge TE stock /32 x rams etc Some 6-lb stock actually stronger 10 12-lb stock depending grain makeup Propeller might want start unit since somewhat different norm blade outlines should cut laid up thinned white glue form similar plan No need soak blades Merely tape position separated wax paper set aside few days dry hub little block spruce cut drilled size relieved shaft front rubbed out Hot Stuff hardening prop folder stops glued after installation hangers last step photos should help explain Suffice say solderless hub unit comes out very light being strong enough task After prop blades dry should edge-sanded covered dope tissue bottom cut made inlet tubing carries hangers glued place cyanoacrylate CyA plywood cheeks put place Form hangers simple wire Ls test-fit tubing inlets Set blade pitch jig proper orientation tape hanger down 900 thrust line gob 5min epoxy will hold together Once both blades done mounted hub kept place short lengths tubing glued outer ends hangers well should have prop unit nominal 23 diameter 30 pitch hub spring washers target weight 12 14 grams Stabilizer/fin Build next Use wood sizes shown plan try go easy CyA glue Try avoid placing stress parts helping prevent unnecessary warping p / / / \ NI / j N AV / -I i /~A-. fin has internal basswood spar gets installed off plan after diagonals place stabilizer has light ribs external basswood spars vertical webbing leave out Uncovered weights 5 gram fm 18 grams stabilizer 25 grams both could tolerated Sand pieces well set aside covering Wing helpful line up pins locating LE TE good straightedge Pin pieces place plywood template cut out ribs Cut fit diagonally glue until polyhedral ribs also cut fit set proper angles method prepare angular templates polyhedral plan glue set ribs before adding anything else Left Wing structureatoentersection showsexternai spars webbing dlhedrai keeper iightweightgussetsasareoften seenon Indoor modeis Ribs medium-to-firm 1/16-in quarter-grain sheet Right internai spar diagonal components fin made basswood frame firm springy stock Giued cyanoacryiate very smaii drops covered weight wiii under 1 gram 66 Model Aviation Looking through supertransiucentSky wrap coverIng shows off functional design exceiient proportions highiy-speclallzed model Au pica author Full-Size Plans Available. See Page 162 2 '-~ 9 4 __e6 743& 4f / 2A~ a66 24 w -J z 0 Tip washout should shimmed indi cated As insurance actually crack TE douse CyA hold setting shims razor-planed contour can used over over Lastly add top external basswood spar Remove whole wing plan turn over gluing bottom spar Fudge vertical webbing shown glue place Air loads lightweight model demand use web bing leave out Sand everything cut panels apart prop up units install proper polyhedral After add ply brace center hogging out holes three center ribs insertion glue CyA uncovered wing should weigh 12 16 grams tape rubberbands Try get seam very straight should have cut sheet approx 06 wider indicated circumference x D et unit outside sun near benign heat source Under good conditions blank will take set dry about hour dry start wiggle blank bit make sure free mandrel may have slip card under seam free up once sure free time glue seam holding everything over paper bag over back lawn pulling tube off mandrel seam pointed down tack-glue inch As long pointed down CyA will bite Once off form set tube upright paper bag piece wax paper bottom run fat bead CyA down intended seam letting gravity work After squaring up ends sanding block install collars shown set aside boom similarly formed dope hot water should made Y32 A-grain sheet should either measured gore made pattern Form dry above tack-glue seam removed mandrel Cut glue circular bulkheads cram place long dowel dive bomb CyA glue keep place essential Continued page 152 Fuselage dislike making rolled-tube mo tor sticks unparalleled strength/weight bit bullet methods might lessen pain make convert plans call nominal dimensions based availability materials can buy good A-grain stock weighs nine 11 grams per 4-in-wide sheet means go larger diameter used closet rods lumberyard man drels withthe rear lOin orsotaperedwith razor plane form upward-tapering boom straight part sand out nice sheet balsa both sides dope side three times thinned-out ni trate dope Sand again dope has dried Hold blank undoped side up under bathroom shower about 30 sec water hot can get Try keep doped side dry fry thy hands Pat dry sort wrap/coax around mandrel Hold place masking August 1986 67 Superlight stabilizer platform dethermalizer system have proven reliable several authois previous models Hold-down hook fuse snuffer complete simple setup FF Duration/Murphy Continued page 149 have suddenly appeared everywhere again being listed $695but sale $591 mechanism seems somewhat smaller version last saw shelves however spring very strong can rigged up used fuel shutoff very satisfactorily wont attempt explain pet apparatus design harness mechanisms fuel shut-off use seems nearly Gas flier has own patented device conversion no means unique have something little different surefire functional would certainly interested relaying design readers Well its about time disappear two months well So see ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Indoor/Tenny Continued page 62 form twisted like prop blade will fit flat prop block Thus out line formed already properly curved twisted done outline should fitted block during construction moistened relieve stress twisting glued ribs spar after drying Note outline moistened after being tached ribs spar wood will ex pand stress whole structure Prop covering Prop blades should covered prop block possible Otherwise water saliva used adhesive cover trim prop return prop block until moisture has evaporated Also prop covered prop block film must slack enough blade lie film distortion blade twist - can changed during covering film will too tight let blade resume normal twist stress Another important tactic sure film attached both outline ribs accomplishes three things First mois ture used adhesive entire blade ex pands evenly minimizing stress Second individual panels film small enough stiffen blade Finally damage film single section wont spread other sections Dont worry about wrinkles appear blades dry out simple operation will remove Use very fine artist brush moistened water work out wrinkles Stroke brush along wrinkle will pull up level film around After wrinkles treated let whole assembly dry again Finally store prop holder keeps blades touching anything Prop InnovatIons number different plastic props available photos shows convert efficient pusher operation Peanut Scale models free wheeling ratchet front trimmed flat make bearing surface shaft pro jected through hub bent over push against blade Al Backstrom flew setup Bedford Boys Ranch Bedford TX Another photo shows same basic prop hub Photo 1 case small plastic blades removed much larger balsa blades substituted model Profile Scale model flown Randy Randolph again Bedford Boys Ranch Novice Pennyplane has rule limiting prop diameter handle power three-gram model needs Jim Clem trying very wide blades 2Y-in wide blade six inches long shaft tip Ill report performance soon can get some numbers Next time prop blocks prop-covering techniques Bud Tenny Box 545 Richardson TX 75080 Dawnwalker/Oldenkafl1P Continued page 67 maintain rigidity aft motor peg form mount DT tube platforms etc True up main joint slide boom over aft motor hard collar glue works together white glue CyA Eyeball everything good symmetry Sand whole fuselage including down right thrust Add platforms front edge strapping tape reinforcement CyA glue wicks well stufi make up pylons pins wing plat form etc Sand wing mounting unit contour glue yet Make drill nose plug may want spray IN STOCK FOR IMMEDIATE SHIPMENT NEW AH 6237 Cu in$19995 NewOoedre40CDII3-bOeniflgI$12995 Reg 0040 40 912266 Bnighelle flywheel 014295 Reg Ooede 40 Power Aeoenrbly Only$7195 OUAORA REPAIR81000 plo pertol Jin Me. ERCOUPEPLANS $2300 SEMI-KIT 99995 Jim Moeger TOMAHAWK PLANS $2290 SEMI-KIT $9996 Jin Menor6BALLTRPLANS $2395 SEMI-KIT$9995 Ji Meceer ACROBATPLANS 91996 SEMI-KIT $6996 MALONEY 100912996ZONOAH 939 $12995 SACHS-DOLMAR ai CDI 9637 CDI 96 FLOATS 49 114 onclc $2190 co,rplnte kit $4796 19WWIWHEELS 92696 PlKSpningStenton92490 PLANS SUPER STEARMAN 114 IGodfreyl$2999 113 TAYLORCRAFT 0112 CUB Nelite92995 Volkoplco 113 Chicken Charliol$2395 Servo H366 42 no $1296 Wonld 516 9 Ing wodele 93696 PROPS loll aicee Anger Top Flit Oynethnool 20% OFF US Onedre FUEL TANKS160066992300 9796 FIBERGLASS ARROW SHAFTS 911$ 023 long6/61196 24 Hoe Se.4nc 5250 penEege Seed Meek Cheek en Meey 0-do JIM MESSERS QUALITY MODEL PRODUCTS Valey View Dr Box 43 eany NY 14706 PRODUCTS Complete Line Exhaust Systems o Tuned Pipes0 Muffled Tuned Pipes o Headers * Venturi Mufflers o Expansion Mufflers 0 Helicopter Ball Mufflers ialized Exhaust Systems UnsurpaSJ WANNA RACE N RTH AST AREA BEGINNER RACES 0 nFORM-1 oFAI E Instructions Club Programs Information Contact NORTH EAST PYLON RACING ORGANIZATION m 119 DEAN AVE FRANKLIN MASS 02038 Tel 617 528-4043 203 673-2000 152 Model Aviation MODEL PRODUCTS CORP BOX 314 Pompton Plains NJ 07444 available write direct add S200 $500 outside US Covering assembly biggest stumbling blocks us locating lightweight covering materials After trying rejecting several fortunate locate non-modeling product have dubbed Skywrap weighs about 40% best tissue adheres either white glue RC56 shrinks under passive heat open oven door accepts spray dope color accents can drawn drafting ink etc quite strong puncture proof stuff commonly used supermarkets taking home veggies As plastics go amazing stuff sample roll am using Conoco North Carolina can find stuff dont afraid use am currently trying arrange supply unperforated unprinted lengths mail order sale Ordinary modeling tissue will work things carefully Finish off weak alcohol spray two thin coats plasti cized nitrate dope Krylon Crystal Clear tissue job will probably sag damp weather despair nature beast have used Skywrap no such problems will occur Either way try get smooth job Add usual AMA numbers identification label name address phone number big splat oolor left wing tip will help timer keep plane sight should have prop assembly finished put platforms etc Line up install vertical fin Mount stabilizer rubberbands put hunk DT fuse Strap wing pylons/platform unit Add prop assem bly front set up model over knife-edge surface balancing may need extra hands operation Nudge things around bit until correct balance point achieved pencil-mark pylons motor tube Hot Stuff wing mount place over marks Take few minutes admire finished product Check warps niisalignments Since purpose-built aircraft really will tolerate gross aberrations Carefully weigh whole unit taking note gram readout Mark figure down plane somewhere Trimming/flying Assuming airframe weight 55 60 grams beginning power should 12 strands of-in rubber approx 40 long Make up three motors Lube well let rest overnight Two should dried off broken wound breaking point sounds waste ful rubber batches vary greatlyeven within same batch Make note airplane max wind figure make deal yourselfto never exceed 90% figureeven going gold can credit George Perryman tip insist try some test glides motor installed prop folded thin shim will probably needed under rear stabilizeras much /16 looks appropriate crank 400 turns launch allowing model fly out hand wont ball fire point Stalls cured usual way add downthrust minor right thrust Hope fully altitude will gained prop will fold glide can observed Resist over-elevating ship wants go low slow take forever get clock prop rpm will get about 150 Add power bunches 100 winds shimming/trimming out unwanted ten dencies Eventually will have worked way up 1150 turns beast will come alive like proverbial butterfly proudly justifying its crafty competitive builder should can get emotional witnessing kinds aero delights ship strong enough flown zephyrs pushing eight knots own after point Changes Dawnwalker III starting place wish explore maximum Mulvihill performance Dawnwalker used sliced-rib alternate shown plans although flew very well flew August 1986 153 fuselage components light coat Krylon Crystal Clear B #1301 #1303 really necessaryand sand #400 paper EASY TO BUILD HANDCRAFTED KITS AT LOW PRICES 3g spanWeigni OsWing span s Wing span WeIght 4 lOs Length 53 inEngine 60 -90Length 45 inEngine 45 -60Length 48 inEngine 40 Kits include Pre-built fiberglass fuselage foam cores sheeted balsa machine cut balsa tail surfaces shaped strip ailerons complete hardware pack SEND CHECK OR MONEY ORDER TOVISA & MASTER CARD ACCEPTED W HORIZON MODELS INC T-404 Kelly Ave Manchester NH 03103 603 627-9503 indoors club meeting won trophy strong belch would throw off course terminal tail slide airfoil shown should very generally allow better penetration turbulence pro vide superior glide somewhat durable could increase mo tor tube length believe would appreciably enhance performance V-dihedral has tried have taller pylons neither added much except struc tural problems heart design low aspect ratio wing very slow prop/rubber combination opposed tra ditional out-of-sight climb/glide mode uppermost thought fun pursuit toward worthwhile goal uncon ventional point view hope build fly project will extract same pleasure did 154 Model Aviation CL Scale/Boss Continued page 68 patibility chart May 1985 column stiffened cloth will easier work will look much neater threads will straighter instead wavy squirrelly look cant avoid using standard application method item W Rozelle found Wing Tips Newsletter Mid-Hudson Mod elmasters courtesy SAM re printed Corsair Mini-contest report Roland Baltes San Pedro CA reports Southwestern Regionals held Buckeye AZ once seeing fair turnout CL Sport Scale event years event held January entry nine models four twin-engine types Weather good temperature Seventies wind minimum excellent day Scale flying Some months photos Roland Buckeye entries Roland commented nine entries may seem like much happening area hasnt seen Scale meet over year turnout nine considered fairly good Roland expects next years contest hopes able report another good increase activity Please send correspondenceand espe cially photosrelating CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 69 other maneuver Square Eight helped aft center gravity wind Because planes speed increase opens up corners tough keep maneuver right size As mentioned last month horse power maneuver strong engine will worth its weight gold maintaining line ten sion resisting speed increases hint havent great engine make maneuver tall narrow spend less time try ing penetrate wind wont perfect will able complete recogniza able Eight calm air move backwards during top horizontal leg thus allowing critical areas bottom corners intersectionto flown free wake turbulence Also avoid hit ting corners hard calm high drag results will sap airspeed horse power weak engine can run out steam long difficult Square Eight Whipping couple laps prior entry will build up little stored energy good air Vertical Eight quite easy can find cloud 450 use inter sections simply fly two perfect loops top other wind up becomes lot tougher way up never let fuselage get hori zontal intersection does will never get top loop round right size against wind Reverse control just before path airplane starts descend regardless its body angle Once get top consciously apply Down control maintain radius outside loop make intersection wind blows down exception rule never seeing body angle tangent intersection before reversing control Allow flight path just stop descending before giv ing Up complete Eight Try avoid non-pro look climbing inverted inter section relatively painless calm-air maneu ver step two just past intersection way up should enough Hourglass probably mistreated maneuvers almost fliers make same errors As Triangle first corner turned too far resulting climb angles far off fliers right second error often combination first mak ing top leg parallel bottom Both er rors result plane being position impossible complete maneu ver acceptably either front behind directly over head flier solution addition horsepower first error stop first corner just flying correct Triangle resulting climb steep slightly infl fl P55 PS flflPS PS PS PS PS S PS PS 4 VIDEO i Special Summer Rates June tbru August Only Rentals 1y 1195 Any 2 2300 All Tape Purchases 10% OFF - - Retail - 1 Basic Construction Beginners 107 Mm 49 95 42 Basic Flight Training Beginners 65 Mm44 95 3 World Model Aniarion 90 Mm 44 95 4 Oshkosh Onerviess 55Mm 3995 5Airplane Funnies 30 Mm39 95 61JS Scln Masters 60 Mm4195 Action 75 Mm 4995 dge Hoppin Vol 145 Mm 41 95 4 9 Which Wag Up 70 Mm 47954 K lOHedga Hoppin Vol 1140 Mm 4195 4 Rental Depositm Retail Price Tape 4 K Rental Dnratlnnm 7 Days After Del lueryK K Payment Chech 110 daysl MO Visa/M C Card # & 4 4 Eup Date Phone # C OD u Anailahle hy Phone4 K Shippingm 375 Foreign Canada Add 10% Total 4 4 Others 15% IL Res Add 7% Tan4 KAcademy AvIatIon R & D PO Boo 2774 4Hazel Crest IL 60428 335-07764 4.4
Edition: Model Aviation - 1986/08
Page Numbers: 64, 65, 66, 67, 152, 153, 154
The moment truth prototype builder Bob Langdon few milliseconds maiden flight Dawnwalker Ill rubber wound only400turns winds less ideal model clocked absolutely magnificent 330 prop leading edge profile clearly flaring under power burst efficient power utilization no-frills lightweight approach model also very evident THERE IS NOTHING NEW under sun True late Sixties George Perryman flying 2-oz Unlimited Rubber subsequently renamed Mulvihill ship featured 5-mm motor run fixed prop dethermalizing condenser paper covering Zaic three-view drawing notes pointed heavier regu lar version obviously would survive better competition Since time course have changes both AMA FF Rubber events emerging special contests suspect will eventually find place rule book intriguing what once named Meuser Marvelous Mulvi hill after innovative founder Robert B Meuser well known columnist/author/de signer aim probe ultimate Mulvihill performance through earlymorning dawn one-shot winner-take-all contest now rules simple foxy order eliminate occa sional Pennyplane F iD entry regular AMA Mulvihill rules applyplusthe model must have double-covered surfaces en closed motor airplane itself must weigh minimum 30 grams model rubber motor must weigh no less 60 grams Very challenging number such competitions have staged over past seven years notably US FF Championships Taft Robert P White Great Grand Gumbandito has pretty much dominated event remarkable times averaging 11 mm high 14 min airplane 80-gram version renowned Twin Fin represents current state art have great respect thought worthwhile broach alternate 1984 Reno Nats several San Diego Orbiteer crowd hunkered down over casino food sort dared other attempt indoor/outdoortype Mulvihill might eventually prove viable contender Dawn Flight events date four us Charlie Yost Robert Langdon Don McHugh author have built flown eight pre tenders task varying degrees success Weights have run 50 80 grams Fragility factor zero passable Langdon recorded high time 15 min 40 sec Otay Mesa test field intended withstand rigors midday com petition unlimited-type Mulvihill model designed early morning calm air has butterfly-like speed almost mesmerizing grace stretch near-nothing lift unbeliev able flight duration EJohn Oldenkamp 64 Model Aviation went across Mexican border retrieve has best results prop run 840 Dawnwalker prototype snapped wing dethermalizing Air loads collapsed McHughs new creation about 130 experiment unknowns have become public through pragmatism have extremely delightful deal work project progressed still experi menting model presented could starting point aspiring Mulvihill flier view very safe design rewards builder uncommon pleas ure Dawnwalker fact captured first place its first outing regular Mulvi eventwith no help pilot sent off downthrust shim omitted first flight absolutely majestic flight Given light non-thermal conditions will butterfly along approximately 150 rpm through prop run 5 8 mm depending trim air density settling heart stoppingly slow glide after prop folds ways clearly retrograde model acting like doing things really shouldnt days hightechery Left heart matter big thin highiy-pitched prop gives th Dawnwaiker series its punch Easy make sheet balsa thinned white glue props can-formed have soiderless hubs Foreground version fora model lii whiie background ver sions eariier sets Rubberbands earlierversions assist folding proved unneeeded Right Front end motortube reinforced strapping tape outside Also note notch forthe winding bar tube piatforms DT hardware weighed 176 gramstotal Left Wing mounting system strong lightweight Wili let motor tube distort winds piled up Straight-grain pylon sides may make some nervous work fine Add vertical pieces strength like Right Alternate sliced-rib wing construction want ultimate slow flier Prototype wing background used 36-in lengths leading edge stock weighed 13 grams August 1986 65 angaon aaaea extra semi-webbing wing tips stabilizersectionnot really necessary greatly improves strength Air loads alone will keep prop folded discovery process has answered some questions Lightweights need fly slowly once upset invariably go power stall speed up dash earth discouraging results tricky ground turbulence seem need inordinate amount power-robbing downthrust cure foregoing However given light air performance ab solutely astoundingly magnificent think will disappointed try Construction Target weight fin ished model less rubber motor 55 grams Selection materials very im portant thoughtful use glue Proper ly done will hit mark end up attractive reasonably robust machine Weigh everything ahead time good triple beam balance scale discard parts grossly overweight As guidelines balsa sheet weights about follows motor tube blank 345 x 36 95 grams rib sheet stock 3 x 36 Bgrain 12 grams wing leading edge LE trailing edge TE stock /32 x rams etc Some 6-lb stock actually stronger 10 12-lb stock depending grain makeup Propeller might want start unit since somewhat different norm blade outlines should cut laid up thinned white glue form similar plan No need soak blades Merely tape position separated wax paper set aside few days dry hub little block spruce cut drilled size relieved shaft front rubbed out Hot Stuff hardening prop folder stops glued after installation hangers last step photos should help explain Suffice say solderless hub unit comes out very light being strong enough task After prop blades dry should edge-sanded covered dope tissue bottom cut made inlet tubing carries hangers glued place cyanoacrylate CyA plywood cheeks put place Form hangers simple wire Ls test-fit tubing inlets Set blade pitch jig proper orientation tape hanger down 900 thrust line gob 5min epoxy will hold together Once both blades done mounted hub kept place short lengths tubing glued outer ends hangers well should have prop unit nominal 23 diameter 30 pitch hub spring washers target weight 12 14 grams Stabilizer/fin Build next Use wood sizes shown plan try go easy CyA glue Try avoid placing stress parts helping prevent unnecessary warping p / / / \ NI / j N AV / -I i /~A-. fin has internal basswood spar gets installed off plan after diagonals place stabilizer has light ribs external basswood spars vertical webbing leave out Uncovered weights 5 gram fm 18 grams stabilizer 25 grams both could tolerated Sand pieces well set aside covering Wing helpful line up pins locating LE TE good straightedge Pin pieces place plywood template cut out ribs Cut fit diagonally glue until polyhedral ribs also cut fit set proper angles method prepare angular templates polyhedral plan glue set ribs before adding anything else Left Wing structureatoentersection showsexternai spars webbing dlhedrai keeper iightweightgussetsasareoften seenon Indoor modeis Ribs medium-to-firm 1/16-in quarter-grain sheet Right internai spar diagonal components fin made basswood frame firm springy stock Giued cyanoacryiate very smaii drops covered weight wiii under 1 gram 66 Model Aviation Looking through supertransiucentSky wrap coverIng shows off functional design exceiient proportions highiy-speclallzed model Au pica author Full-Size Plans Available. See Page 162 2 '-~ 9 4 __e6 743& 4f / 2A~ a66 24 w -J z 0 Tip washout should shimmed indi cated As insurance actually crack TE douse CyA hold setting shims razor-planed contour can used over over Lastly add top external basswood spar Remove whole wing plan turn over gluing bottom spar Fudge vertical webbing shown glue place Air loads lightweight model demand use web bing leave out Sand everything cut panels apart prop up units install proper polyhedral After add ply brace center hogging out holes three center ribs insertion glue CyA uncovered wing should weigh 12 16 grams tape rubberbands Try get seam very straight should have cut sheet approx 06 wider indicated circumference x D et unit outside sun near benign heat source Under good conditions blank will take set dry about hour dry start wiggle blank bit make sure free mandrel may have slip card under seam free up once sure free time glue seam holding everything over paper bag over back lawn pulling tube off mandrel seam pointed down tack-glue inch As long pointed down CyA will bite Once off form set tube upright paper bag piece wax paper bottom run fat bead CyA down intended seam letting gravity work After squaring up ends sanding block install collars shown set aside boom similarly formed dope hot water should made Y32 A-grain sheet should either measured gore made pattern Form dry above tack-glue seam removed mandrel Cut glue circular bulkheads cram place long dowel dive bomb CyA glue keep place essential Continued page 152 Fuselage dislike making rolled-tube mo tor sticks unparalleled strength/weight bit bullet methods might lessen pain make convert plans call nominal dimensions based availability materials can buy good A-grain stock weighs nine 11 grams per 4-in-wide sheet means go larger diameter used closet rods lumberyard man drels withthe rear lOin orsotaperedwith razor plane form upward-tapering boom straight part sand out nice sheet balsa both sides dope side three times thinned-out ni trate dope Sand again dope has dried Hold blank undoped side up under bathroom shower about 30 sec water hot can get Try keep doped side dry fry thy hands Pat dry sort wrap/coax around mandrel Hold place masking August 1986 67 Superlight stabilizer platform dethermalizer system have proven reliable several authois previous models Hold-down hook fuse snuffer complete simple setup FF Duration/Murphy Continued page 149 have suddenly appeared everywhere again being listed $695but sale $591 mechanism seems somewhat smaller version last saw shelves however spring very strong can rigged up used fuel shutoff very satisfactorily wont attempt explain pet apparatus design harness mechanisms fuel shut-off use seems nearly Gas flier has own patented device conversion no means unique have something little different surefire functional would certainly interested relaying design readers Well its about time disappear two months well So see ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Indoor/Tenny Continued page 62 form twisted like prop blade will fit flat prop block Thus out line formed already properly curved twisted done outline should fitted block during construction moistened relieve stress twisting glued ribs spar after drying Note outline moistened after being tached ribs spar wood will ex pand stress whole structure Prop covering Prop blades should covered prop block possible Otherwise water saliva used adhesive cover trim prop return prop block until moisture has evaporated Also prop covered prop block film must slack enough blade lie film distortion blade twist - can changed during covering film will too tight let blade resume normal twist stress Another important tactic sure film attached both outline ribs accomplishes three things First mois ture used adhesive entire blade ex pands evenly minimizing stress Second individual panels film small enough stiffen blade Finally damage film single section wont spread other sections Dont worry about wrinkles appear blades dry out simple operation will remove Use very fine artist brush moistened water work out wrinkles Stroke brush along wrinkle will pull up level film around After wrinkles treated let whole assembly dry again Finally store prop holder keeps blades touching anything Prop InnovatIons number different plastic props available photos shows convert efficient pusher operation Peanut Scale models free wheeling ratchet front trimmed flat make bearing surface shaft pro jected through hub bent over push against blade Al Backstrom flew setup Bedford Boys Ranch Bedford TX Another photo shows same basic prop hub Photo 1 case small plastic blades removed much larger balsa blades substituted model Profile Scale model flown Randy Randolph again Bedford Boys Ranch Novice Pennyplane has rule limiting prop diameter handle power three-gram model needs Jim Clem trying very wide blades 2Y-in wide blade six inches long shaft tip Ill report performance soon can get some numbers Next time prop blocks prop-covering techniques Bud Tenny Box 545 Richardson TX 75080 Dawnwalker/Oldenkafl1P Continued page 67 maintain rigidity aft motor peg form mount DT tube platforms etc True up main joint slide boom over aft motor hard collar glue works together white glue CyA Eyeball everything good symmetry Sand whole fuselage including down right thrust Add platforms front edge strapping tape reinforcement CyA glue wicks well stufi make up pylons pins wing plat form etc Sand wing mounting unit contour glue yet Make drill nose plug may want spray IN STOCK FOR IMMEDIATE SHIPMENT NEW AH 6237 Cu in$19995 NewOoedre40CDII3-bOeniflgI$12995 Reg 0040 40 912266 Bnighelle flywheel 014295 Reg Ooede 40 Power Aeoenrbly Only$7195 OUAORA REPAIR81000 plo pertol Jin Me. ERCOUPEPLANS $2300 SEMI-KIT 99995 Jim Moeger TOMAHAWK PLANS $2290 SEMI-KIT $9996 Jin Menor6BALLTRPLANS $2395 SEMI-KIT$9995 Ji Meceer ACROBATPLANS 91996 SEMI-KIT $6996 MALONEY 100912996ZONOAH 939 $12995 SACHS-DOLMAR ai CDI 9637 CDI 96 FLOATS 49 114 onclc $2190 co,rplnte kit $4796 19WWIWHEELS 92696 PlKSpningStenton92490 PLANS SUPER STEARMAN 114 IGodfreyl$2999 113 TAYLORCRAFT 0112 CUB Nelite92995 Volkoplco 113 Chicken Charliol$2395 Servo H366 42 no $1296 Wonld 516 9 Ing wodele 93696 PROPS loll aicee Anger Top Flit Oynethnool 20% OFF US Onedre FUEL TANKS160066992300 9796 FIBERGLASS ARROW SHAFTS 911$ 023 long6/61196 24 Hoe Se.4nc 5250 penEege Seed Meek Cheek en Meey 0-do JIM MESSERS QUALITY MODEL PRODUCTS Valey View Dr Box 43 eany NY 14706 PRODUCTS Complete Line Exhaust Systems o Tuned Pipes0 Muffled Tuned Pipes o Headers * Venturi Mufflers o Expansion Mufflers 0 Helicopter Ball Mufflers ialized Exhaust Systems UnsurpaSJ WANNA RACE N RTH AST AREA BEGINNER RACES 0 nFORM-1 oFAI E Instructions Club Programs Information Contact NORTH EAST PYLON RACING ORGANIZATION m 119 DEAN AVE FRANKLIN MASS 02038 Tel 617 528-4043 203 673-2000 152 Model Aviation MODEL PRODUCTS CORP BOX 314 Pompton Plains NJ 07444 available write direct add S200 $500 outside US Covering assembly biggest stumbling blocks us locating lightweight covering materials After trying rejecting several fortunate locate non-modeling product have dubbed Skywrap weighs about 40% best tissue adheres either white glue RC56 shrinks under passive heat open oven door accepts spray dope color accents can drawn drafting ink etc quite strong puncture proof stuff commonly used supermarkets taking home veggies As plastics go amazing stuff sample roll am using Conoco North Carolina can find stuff dont afraid use am currently trying arrange supply unperforated unprinted lengths mail order sale Ordinary modeling tissue will work things carefully Finish off weak alcohol spray two thin coats plasti cized nitrate dope Krylon Crystal Clear tissue job will probably sag damp weather despair nature beast have used Skywrap no such problems will occur Either way try get smooth job Add usual AMA numbers identification label name address phone number big splat oolor left wing tip will help timer keep plane sight should have prop assembly finished put platforms etc Line up install vertical fin Mount stabilizer rubberbands put hunk DT fuse Strap wing pylons/platform unit Add prop assem bly front set up model over knife-edge surface balancing may need extra hands operation Nudge things around bit until correct balance point achieved pencil-mark pylons motor tube Hot Stuff wing mount place over marks Take few minutes admire finished product Check warps niisalignments Since purpose-built aircraft really will tolerate gross aberrations Carefully weigh whole unit taking note gram readout Mark figure down plane somewhere Trimming/flying Assuming airframe weight 55 60 grams beginning power should 12 strands of-in rubber approx 40 long Make up three motors Lube well let rest overnight Two should dried off broken wound breaking point sounds waste ful rubber batches vary greatlyeven within same batch Make note airplane max wind figure make deal yourselfto never exceed 90% figureeven going gold can credit George Perryman tip insist try some test glides motor installed prop folded thin shim will probably needed under rear stabilizeras much /16 looks appropriate crank 400 turns launch allowing model fly out hand wont ball fire point Stalls cured usual way add downthrust minor right thrust Hope fully altitude will gained prop will fold glide can observed Resist over-elevating ship wants go low slow take forever get clock prop rpm will get about 150 Add power bunches 100 winds shimming/trimming out unwanted ten dencies Eventually will have worked way up 1150 turns beast will come alive like proverbial butterfly proudly justifying its crafty competitive builder should can get emotional witnessing kinds aero delights ship strong enough flown zephyrs pushing eight knots own after point Changes Dawnwalker III starting place wish explore maximum Mulvihill performance Dawnwalker used sliced-rib alternate shown plans although flew very well flew August 1986 153 fuselage components light coat Krylon Crystal Clear B #1301 #1303 really necessaryand sand #400 paper EASY TO BUILD HANDCRAFTED KITS AT LOW PRICES 3g spanWeigni OsWing span s Wing span WeIght 4 lOs Length 53 inEngine 60 -90Length 45 inEngine 45 -60Length 48 inEngine 40 Kits include Pre-built fiberglass fuselage foam cores sheeted balsa machine cut balsa tail surfaces shaped strip ailerons complete hardware pack SEND CHECK OR MONEY ORDER TOVISA & MASTER CARD ACCEPTED W HORIZON MODELS INC T-404 Kelly Ave Manchester NH 03103 603 627-9503 indoors club meeting won trophy strong belch would throw off course terminal tail slide airfoil shown should very generally allow better penetration turbulence pro vide superior glide somewhat durable could increase mo tor tube length believe would appreciably enhance performance V-dihedral has tried have taller pylons neither added much except struc tural problems heart design low aspect ratio wing very slow prop/rubber combination opposed tra ditional out-of-sight climb/glide mode uppermost thought fun pursuit toward worthwhile goal uncon ventional point view hope build fly project will extract same pleasure did 154 Model Aviation CL Scale/Boss Continued page 68 patibility chart May 1985 column stiffened cloth will easier work will look much neater threads will straighter instead wavy squirrelly look cant avoid using standard application method item W Rozelle found Wing Tips Newsletter Mid-Hudson Mod elmasters courtesy SAM re printed Corsair Mini-contest report Roland Baltes San Pedro CA reports Southwestern Regionals held Buckeye AZ once seeing fair turnout CL Sport Scale event years event held January entry nine models four twin-engine types Weather good temperature Seventies wind minimum excellent day Scale flying Some months photos Roland Buckeye entries Roland commented nine entries may seem like much happening area hasnt seen Scale meet over year turnout nine considered fairly good Roland expects next years contest hopes able report another good increase activity Please send correspondenceand espe cially photosrelating CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 69 other maneuver Square Eight helped aft center gravity wind Because planes speed increase opens up corners tough keep maneuver right size As mentioned last month horse power maneuver strong engine will worth its weight gold maintaining line ten sion resisting speed increases hint havent great engine make maneuver tall narrow spend less time try ing penetrate wind wont perfect will able complete recogniza able Eight calm air move backwards during top horizontal leg thus allowing critical areas bottom corners intersectionto flown free wake turbulence Also avoid hit ting corners hard calm high drag results will sap airspeed horse power weak engine can run out steam long difficult Square Eight Whipping couple laps prior entry will build up little stored energy good air Vertical Eight quite easy can find cloud 450 use inter sections simply fly two perfect loops top other wind up becomes lot tougher way up never let fuselage get hori zontal intersection does will never get top loop round right size against wind Reverse control just before path airplane starts descend regardless its body angle Once get top consciously apply Down control maintain radius outside loop make intersection wind blows down exception rule never seeing body angle tangent intersection before reversing control Allow flight path just stop descending before giv ing Up complete Eight Try avoid non-pro look climbing inverted inter section relatively painless calm-air maneu ver step two just past intersection way up should enough Hourglass probably mistreated maneuvers almost fliers make same errors As Triangle first corner turned too far resulting climb angles far off fliers right second error often combination first mak ing top leg parallel bottom Both er rors result plane being position impossible complete maneu ver acceptably either front behind directly over head flier solution addition horsepower first error stop first corner just flying correct Triangle resulting climb steep slightly infl fl P55 PS flflPS PS PS PS PS S PS PS 4 VIDEO i Special Summer Rates June tbru August Only Rentals 1y 1195 Any 2 2300 All Tape Purchases 10% OFF - - Retail - 1 Basic Construction Beginners 107 Mm 49 95 42 Basic Flight Training Beginners 65 Mm44 95 3 World Model Aniarion 90 Mm 44 95 4 Oshkosh Onerviess 55Mm 3995 5Airplane Funnies 30 Mm39 95 61JS Scln Masters 60 Mm4195 Action 75 Mm 4995 dge Hoppin Vol 145 Mm 41 95 4 9 Which Wag Up 70 Mm 47954 K lOHedga Hoppin Vol 1140 Mm 4195 4 Rental Depositm Retail Price Tape 4 K Rental Dnratlnnm 7 Days After Del lueryK K Payment Chech 110 daysl MO Visa/M C Card # & 4 4 Eup Date Phone # C OD u Anailahle hy Phone4 K Shippingm 375 Foreign Canada Add 10% Total 4 4 Others 15% IL Res Add 7% Tan4 KAcademy AvIatIon R & D PO Boo 2774 4Hazel Crest IL 60428 335-07764 4.4
Edition: Model Aviation - 1986/08
Page Numbers: 64, 65, 66, 67, 152, 153, 154
The moment truth prototype builder Bob Langdon few milliseconds maiden flight Dawnwalker Ill rubber wound only400turns winds less ideal model clocked absolutely magnificent 330 prop leading edge profile clearly flaring under power burst efficient power utilization no-frills lightweight approach model also very evident THERE IS NOTHING NEW under sun True late Sixties George Perryman flying 2-oz Unlimited Rubber subsequently renamed Mulvihill ship featured 5-mm motor run fixed prop dethermalizing condenser paper covering Zaic three-view drawing notes pointed heavier regu lar version obviously would survive better competition Since time course have changes both AMA FF Rubber events emerging special contests suspect will eventually find place rule book intriguing what once named Meuser Marvelous Mulvi hill after innovative founder Robert B Meuser well known columnist/author/de signer aim probe ultimate Mulvihill performance through earlymorning dawn one-shot winner-take-all contest now rules simple foxy order eliminate occa sional Pennyplane F iD entry regular AMA Mulvihill rules applyplusthe model must have double-covered surfaces en closed motor airplane itself must weigh minimum 30 grams model rubber motor must weigh no less 60 grams Very challenging number such competitions have staged over past seven years notably US FF Championships Taft Robert P White Great Grand Gumbandito has pretty much dominated event remarkable times averaging 11 mm high 14 min airplane 80-gram version renowned Twin Fin represents current state art have great respect thought worthwhile broach alternate 1984 Reno Nats several San Diego Orbiteer crowd hunkered down over casino food sort dared other attempt indoor/outdoortype Mulvihill might eventually prove viable contender Dawn Flight events date four us Charlie Yost Robert Langdon Don McHugh author have built flown eight pre tenders task varying degrees success Weights have run 50 80 grams Fragility factor zero passable Langdon recorded high time 15 min 40 sec Otay Mesa test field intended withstand rigors midday com petition unlimited-type Mulvihill model designed early morning calm air has butterfly-like speed almost mesmerizing grace stretch near-nothing lift unbeliev able flight duration EJohn Oldenkamp 64 Model Aviation went across Mexican border retrieve has best results prop run 840 Dawnwalker prototype snapped wing dethermalizing Air loads collapsed McHughs new creation about 130 experiment unknowns have become public through pragmatism have extremely delightful deal work project progressed still experi menting model presented could starting point aspiring Mulvihill flier view very safe design rewards builder uncommon pleas ure Dawnwalker fact captured first place its first outing regular Mulvi eventwith no help pilot sent off downthrust shim omitted first flight absolutely majestic flight Given light non-thermal conditions will butterfly along approximately 150 rpm through prop run 5 8 mm depending trim air density settling heart stoppingly slow glide after prop folds ways clearly retrograde model acting like doing things really shouldnt days hightechery Left heart matter big thin highiy-pitched prop gives th Dawnwaiker series its punch Easy make sheet balsa thinned white glue props can-formed have soiderless hubs Foreground version fora model lii whiie background ver sions eariier sets Rubberbands earlierversions assist folding proved unneeeded Right Front end motortube reinforced strapping tape outside Also note notch forthe winding bar tube piatforms DT hardware weighed 176 gramstotal Left Wing mounting system strong lightweight Wili let motor tube distort winds piled up Straight-grain pylon sides may make some nervous work fine Add vertical pieces strength like Right Alternate sliced-rib wing construction want ultimate slow flier Prototype wing background used 36-in lengths leading edge stock weighed 13 grams August 1986 65 angaon aaaea extra semi-webbing wing tips stabilizersectionnot really necessary greatly improves strength Air loads alone will keep prop folded discovery process has answered some questions Lightweights need fly slowly once upset invariably go power stall speed up dash earth discouraging results tricky ground turbulence seem need inordinate amount power-robbing downthrust cure foregoing However given light air performance ab solutely astoundingly magnificent think will disappointed try Construction Target weight fin ished model less rubber motor 55 grams Selection materials very im portant thoughtful use glue Proper ly done will hit mark end up attractive reasonably robust machine Weigh everything ahead time good triple beam balance scale discard parts grossly overweight As guidelines balsa sheet weights about follows motor tube blank 345 x 36 95 grams rib sheet stock 3 x 36 Bgrain 12 grams wing leading edge LE trailing edge TE stock /32 x rams etc Some 6-lb stock actually stronger 10 12-lb stock depending grain makeup Propeller might want start unit since somewhat different norm blade outlines should cut laid up thinned white glue form similar plan No need soak blades Merely tape position separated wax paper set aside few days dry hub little block spruce cut drilled size relieved shaft front rubbed out Hot Stuff hardening prop folder stops glued after installation hangers last step photos should help explain Suffice say solderless hub unit comes out very light being strong enough task After prop blades dry should edge-sanded covered dope tissue bottom cut made inlet tubing carries hangers glued place cyanoacrylate CyA plywood cheeks put place Form hangers simple wire Ls test-fit tubing inlets Set blade pitch jig proper orientation tape hanger down 900 thrust line gob 5min epoxy will hold together Once both blades done mounted hub kept place short lengths tubing glued outer ends hangers well should have prop unit nominal 23 diameter 30 pitch hub spring washers target weight 12 14 grams Stabilizer/fin Build next Use wood sizes shown plan try go easy CyA glue Try avoid placing stress parts helping prevent unnecessary warping p / / / \ NI / j N AV / -I i /~A-. fin has internal basswood spar gets installed off plan after diagonals place stabilizer has light ribs external basswood spars vertical webbing leave out Uncovered weights 5 gram fm 18 grams stabilizer 25 grams both could tolerated Sand pieces well set aside covering Wing helpful line up pins locating LE TE good straightedge Pin pieces place plywood template cut out ribs Cut fit diagonally glue until polyhedral ribs also cut fit set proper angles method prepare angular templates polyhedral plan glue set ribs before adding anything else Left Wing structureatoentersection showsexternai spars webbing dlhedrai keeper iightweightgussetsasareoften seenon Indoor modeis Ribs medium-to-firm 1/16-in quarter-grain sheet Right internai spar diagonal components fin made basswood frame firm springy stock Giued cyanoacryiate very smaii drops covered weight wiii under 1 gram 66 Model Aviation Looking through supertransiucentSky wrap coverIng shows off functional design exceiient proportions highiy-speclallzed model Au pica author Full-Size Plans Available. See Page 162 2 '-~ 9 4 __e6 743& 4f / 2A~ a66 24 w -J z 0 Tip washout should shimmed indi cated As insurance actually crack TE douse CyA hold setting shims razor-planed contour can used over over Lastly add top external basswood spar Remove whole wing plan turn over gluing bottom spar Fudge vertical webbing shown glue place Air loads lightweight model demand use web bing leave out Sand everything cut panels apart prop up units install proper polyhedral After add ply brace center hogging out holes three center ribs insertion glue CyA uncovered wing should weigh 12 16 grams tape rubberbands Try get seam very straight should have cut sheet approx 06 wider indicated circumference x D et unit outside sun near benign heat source Under good conditions blank will take set dry about hour dry start wiggle blank bit make sure free mandrel may have slip card under seam free up once sure free time glue seam holding everything over paper bag over back lawn pulling tube off mandrel seam pointed down tack-glue inch As long pointed down CyA will bite Once off form set tube upright paper bag piece wax paper bottom run fat bead CyA down intended seam letting gravity work After squaring up ends sanding block install collars shown set aside boom similarly formed dope hot water should made Y32 A-grain sheet should either measured gore made pattern Form dry above tack-glue seam removed mandrel Cut glue circular bulkheads cram place long dowel dive bomb CyA glue keep place essential Continued page 152 Fuselage dislike making rolled-tube mo tor sticks unparalleled strength/weight bit bullet methods might lessen pain make convert plans call nominal dimensions based availability materials can buy good A-grain stock weighs nine 11 grams per 4-in-wide sheet means go larger diameter used closet rods lumberyard man drels withthe rear lOin orsotaperedwith razor plane form upward-tapering boom straight part sand out nice sheet balsa both sides dope side three times thinned-out ni trate dope Sand again dope has dried Hold blank undoped side up under bathroom shower about 30 sec water hot can get Try keep doped side dry fry thy hands Pat dry sort wrap/coax around mandrel Hold place masking August 1986 67 Superlight stabilizer platform dethermalizer system have proven reliable several authois previous models Hold-down hook fuse snuffer complete simple setup FF Duration/Murphy Continued page 149 have suddenly appeared everywhere again being listed $695but sale $591 mechanism seems somewhat smaller version last saw shelves however spring very strong can rigged up used fuel shutoff very satisfactorily wont attempt explain pet apparatus design harness mechanisms fuel shut-off use seems nearly Gas flier has own patented device conversion no means unique have something little different surefire functional would certainly interested relaying design readers Well its about time disappear two months well So see ya downwind Harry Murphy 3824 Oakwood Blvd Ander son IN 46011 FF Indoor/Tenny Continued page 62 form twisted like prop blade will fit flat prop block Thus out line formed already properly curved twisted done outline should fitted block during construction moistened relieve stress twisting glued ribs spar after drying Note outline moistened after being tached ribs spar wood will ex pand stress whole structure Prop covering Prop blades should covered prop block possible Otherwise water saliva used adhesive cover trim prop return prop block until moisture has evaporated Also prop covered prop block film must slack enough blade lie film distortion blade twist - can changed during covering film will too tight let blade resume normal twist stress Another important tactic sure film attached both outline ribs accomplishes three things First mois ture used adhesive entire blade ex pands evenly minimizing stress Second individual panels film small enough stiffen blade Finally damage film single section wont spread other sections Dont worry about wrinkles appear blades dry out simple operation will remove Use very fine artist brush moistened water work out wrinkles Stroke brush along wrinkle will pull up level film around After wrinkles treated let whole assembly dry again Finally store prop holder keeps blades touching anything Prop InnovatIons number different plastic props available photos shows convert efficient pusher operation Peanut Scale models free wheeling ratchet front trimmed flat make bearing surface shaft pro jected through hub bent over push against blade Al Backstrom flew setup Bedford Boys Ranch Bedford TX Another photo shows same basic prop hub Photo 1 case small plastic blades removed much larger balsa blades substituted model Profile Scale model flown Randy Randolph again Bedford Boys Ranch Novice Pennyplane has rule limiting prop diameter handle power three-gram model needs Jim Clem trying very wide blades 2Y-in wide blade six inches long shaft tip Ill report performance soon can get some numbers Next time prop blocks prop-covering techniques Bud Tenny Box 545 Richardson TX 75080 Dawnwalker/Oldenkafl1P Continued page 67 maintain rigidity aft motor peg form mount DT tube platforms etc True up main joint slide boom over aft motor hard collar glue works together white glue CyA Eyeball everything good symmetry Sand whole fuselage including down right thrust Add platforms front edge strapping tape reinforcement CyA glue wicks well stufi make up pylons pins wing plat form etc Sand wing mounting unit contour glue yet Make drill nose plug may want spray IN STOCK FOR IMMEDIATE SHIPMENT NEW AH 6237 Cu in$19995 NewOoedre40CDII3-bOeniflgI$12995 Reg 0040 40 912266 Bnighelle flywheel 014295 Reg Ooede 40 Power Aeoenrbly Only$7195 OUAORA REPAIR81000 plo pertol Jin Me. ERCOUPEPLANS $2300 SEMI-KIT 99995 Jim Moeger TOMAHAWK PLANS $2290 SEMI-KIT $9996 Jin Menor6BALLTRPLANS $2395 SEMI-KIT$9995 Ji Meceer ACROBATPLANS 91996 SEMI-KIT $6996 MALONEY 100912996ZONOAH 939 $12995 SACHS-DOLMAR ai CDI 9637 CDI 96 FLOATS 49 114 onclc $2190 co,rplnte kit $4796 19WWIWHEELS 92696 PlKSpningStenton92490 PLANS SUPER STEARMAN 114 IGodfreyl$2999 113 TAYLORCRAFT 0112 CUB Nelite92995 Volkoplco 113 Chicken Charliol$2395 Servo H366 42 no $1296 Wonld 516 9 Ing wodele 93696 PROPS loll aicee Anger Top Flit Oynethnool 20% OFF US Onedre FUEL TANKS160066992300 9796 FIBERGLASS ARROW SHAFTS 911$ 023 long6/61196 24 Hoe Se.4nc 5250 penEege Seed Meek Cheek en Meey 0-do JIM MESSERS QUALITY MODEL PRODUCTS Valey View Dr Box 43 eany NY 14706 PRODUCTS Complete Line Exhaust Systems o Tuned Pipes0 Muffled Tuned Pipes o Headers * Venturi Mufflers o Expansion Mufflers 0 Helicopter Ball Mufflers ialized Exhaust Systems UnsurpaSJ WANNA RACE N RTH AST AREA BEGINNER RACES 0 nFORM-1 oFAI E Instructions Club Programs Information Contact NORTH EAST PYLON RACING ORGANIZATION m 119 DEAN AVE FRANKLIN MASS 02038 Tel 617 528-4043 203 673-2000 152 Model Aviation MODEL PRODUCTS CORP BOX 314 Pompton Plains NJ 07444 available write direct add S200 $500 outside US Covering assembly biggest stumbling blocks us locating lightweight covering materials After trying rejecting several fortunate locate non-modeling product have dubbed Skywrap weighs about 40% best tissue adheres either white glue RC56 shrinks under passive heat open oven door accepts spray dope color accents can drawn drafting ink etc quite strong puncture proof stuff commonly used supermarkets taking home veggies As plastics go amazing stuff sample roll am using Conoco North Carolina can find stuff dont afraid use am currently trying arrange supply unperforated unprinted lengths mail order sale Ordinary modeling tissue will work things carefully Finish off weak alcohol spray two thin coats plasti cized nitrate dope Krylon Crystal Clear tissue job will probably sag damp weather despair nature beast have used Skywrap no such problems will occur Either way try get smooth job Add usual AMA numbers identification label name address phone number big splat oolor left wing tip will help timer keep plane sight should have prop assembly finished put platforms etc Line up install vertical fin Mount stabilizer rubberbands put hunk DT fuse Strap wing pylons/platform unit Add prop assem bly front set up model over knife-edge surface balancing may need extra hands operation Nudge things around bit until correct balance point achieved pencil-mark pylons motor tube Hot Stuff wing mount place over marks Take few minutes admire finished product Check warps niisalignments Since purpose-built aircraft really will tolerate gross aberrations Carefully weigh whole unit taking note gram readout Mark figure down plane somewhere Trimming/flying Assuming airframe weight 55 60 grams beginning power should 12 strands of-in rubber approx 40 long Make up three motors Lube well let rest overnight Two should dried off broken wound breaking point sounds waste ful rubber batches vary greatlyeven within same batch Make note airplane max wind figure make deal yourselfto never exceed 90% figureeven going gold can credit George Perryman tip insist try some test glides motor installed prop folded thin shim will probably needed under rear stabilizeras much /16 looks appropriate crank 400 turns launch allowing model fly out hand wont ball fire point Stalls cured usual way add downthrust minor right thrust Hope fully altitude will gained prop will fold glide can observed Resist over-elevating ship wants go low slow take forever get clock prop rpm will get about 150 Add power bunches 100 winds shimming/trimming out unwanted ten dencies Eventually will have worked way up 1150 turns beast will come alive like proverbial butterfly proudly justifying its crafty competitive builder should can get emotional witnessing kinds aero delights ship strong enough flown zephyrs pushing eight knots own after point Changes Dawnwalker III starting place wish explore maximum Mulvihill performance Dawnwalker used sliced-rib alternate shown plans although flew very well flew August 1986 153 fuselage components light coat Krylon Crystal Clear B #1301 #1303 really necessaryand sand #400 paper EASY TO BUILD HANDCRAFTED KITS AT LOW PRICES 3g spanWeigni OsWing span s Wing span WeIght 4 lOs Length 53 inEngine 60 -90Length 45 inEngine 45 -60Length 48 inEngine 40 Kits include Pre-built fiberglass fuselage foam cores sheeted balsa machine cut balsa tail surfaces shaped strip ailerons complete hardware pack SEND CHECK OR MONEY ORDER TOVISA & MASTER CARD ACCEPTED W HORIZON MODELS INC T-404 Kelly Ave Manchester NH 03103 603 627-9503 indoors club meeting won trophy strong belch would throw off course terminal tail slide airfoil shown should very generally allow better penetration turbulence pro vide superior glide somewhat durable could increase mo tor tube length believe would appreciably enhance performance V-dihedral has tried have taller pylons neither added much except struc tural problems heart design low aspect ratio wing very slow prop/rubber combination opposed tra ditional out-of-sight climb/glide mode uppermost thought fun pursuit toward worthwhile goal uncon ventional point view hope build fly project will extract same pleasure did 154 Model Aviation CL Scale/Boss Continued page 68 patibility chart May 1985 column stiffened cloth will easier work will look much neater threads will straighter instead wavy squirrelly look cant avoid using standard application method item W Rozelle found Wing Tips Newsletter Mid-Hudson Mod elmasters courtesy SAM re printed Corsair Mini-contest report Roland Baltes San Pedro CA reports Southwestern Regionals held Buckeye AZ once seeing fair turnout CL Sport Scale event years event held January entry nine models four twin-engine types Weather good temperature Seventies wind minimum excellent day Scale flying Some months photos Roland Buckeye entries Roland commented nine entries may seem like much happening area hasnt seen Scale meet over year turnout nine considered fairly good Roland expects next years contest hopes able report another good increase activity Please send correspondenceand espe cially photosrelating CL Scale Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Fancher Continued page 69 other maneuver Square Eight helped aft center gravity wind Because planes speed increase opens up corners tough keep maneuver right size As mentioned last month horse power maneuver strong engine will worth its weight gold maintaining line ten sion resisting speed increases hint havent great engine make maneuver tall narrow spend less time try ing penetrate wind wont perfect will able complete recogniza able Eight calm air move backwards during top horizontal leg thus allowing critical areas bottom corners intersectionto flown free wake turbulence Also avoid hit ting corners hard calm high drag results will sap airspeed horse power weak engine can run out steam long difficult Square Eight Whipping couple laps prior entry will build up little stored energy good air Vertical Eight quite easy can find cloud 450 use inter sections simply fly two perfect loops top other wind up becomes lot tougher way up never let fuselage get hori zontal intersection does will never get top loop round right size against wind Reverse control just before path airplane starts descend regardless its body angle Once get top consciously apply Down control maintain radius outside loop make intersection wind blows down exception rule never seeing body angle tangent intersection before reversing control Allow flight path just stop descending before giv ing Up complete Eight Try avoid non-pro look climbing inverted inter section relatively painless calm-air maneu ver step two just past intersection way up should enough Hourglass probably mistreated maneuvers almost fliers make same errors As Triangle first corner turned too far resulting climb angles far off fliers right second error often combination first mak ing top leg parallel bottom Both er rors result plane being position impossible complete maneu ver acceptably either front behind directly over head flier solution addition horsepower first error stop first corner just flying correct Triangle resulting climb steep slightly infl fl P55 PS flflPS PS PS PS PS S PS PS 4 VIDEO i Special Summer Rates June tbru August Only Rentals 1y 1195 Any 2 2300 All Tape Purchases 10% OFF - - Retail - 1 Basic Construction Beginners 107 Mm 49 95 42 Basic Flight Training Beginners 65 Mm44 95 3 World Model Aniarion 90 Mm 44 95 4 Oshkosh Onerviess 55Mm 3995 5Airplane Funnies 30 Mm39 95 61JS Scln Masters 60 Mm4195 Action 75 Mm 4995 dge Hoppin Vol 145 Mm 41 95 4 9 Which Wag Up 70 Mm 47954 K lOHedga Hoppin Vol 1140 Mm 4195 4 Rental Depositm Retail Price Tape 4 K Rental Dnratlnnm 7 Days After Del lueryK K Payment Chech 110 daysl MO Visa/M C Card # & 4 4 Eup Date Phone # C OD u Anailahle hy Phone4 K Shippingm 375 Foreign Canada Add 10% Total 4 4 Others 15% IL Res Add 7% Tan4 KAcademy AvIatIon R & D PO Boo 2774 4Hazel Crest IL 60428 335-07764 4.4