Radio Control: Scale

Radio Control Scale Bob Dolly Wischer BALSA DOWELS trips Paris FAI meetings have opportunities visit hobby shops very similar US Visits searched pair French-made inflatable air-wheels because reputation light ness weight less half equiv alents search eventually led obscure shop Rue Trousseau central Paris narrow street two blocks long lined ancient buildings school closely bor dered equally narrow sidewalks After walking full length street semi-darkness late afternoon no hobby shop could found Retracing steps opposite direction glimpsed model airplane hanging small unlighted window Entering through heavy iron door first room held few model kits hanging walls corner near door barred cage cashier inside Beyond second doorway lighted room signs human activity faintly detectable slightly sour odor balsa walls room completely covered bins containing meter lengths 39 bun dled balsaand very little else except some benches drawers customer carefully checking through some balsa strips ap peared about A2 /i6 guarding chosen strips make certain dam aged passersby Obviously Indoor modeler assumed favorite hobby shop Well-detaIled weathered F4U-1 D Corsair 1 /8scale L work Phillip Von Ville Built Brian Taylor plans spans 615 weighs 95 lb uses Enya 60 power Sonic System mechanics operate Robart 900 retracts Jim Messers 1 /3-scale J-3 Kitten R first series being built STARS club Olean NY Power isa Quadra 35 wingspan loft Finish Sig dope over Ceconite look Bobs new Douglas Maliplane Long 32-in dummy exhaust pipes curved balsa dowels L Bob shares secrets column plywood baffle Inserted overthe Enya 120 four-stroke engine R divert cooling air through engine fins Bent exhaust pipe made plumbing hardwarel additional surface area pipes convolutions helps dissipate exhaust heat 44 Model Aviation Ed Tennysons Starduster Too built Brisighella plans flown Bealton VA Scale contest Twenty-five-pound craft uses Tartan twin glow Ignition Scale landing gear has working bungee cords Rigging wires cut 1/32-in aluminum sheet scratch-builders Asking wheels English brought blank stares foreigner dared invade Outside popular shops hotels foreign lan guage isnt spoken two persons seemed workers succeeded gaining attention making needs known pencil sketch wheel metric diameter dimension Aha What wanted roue French word wheel drawer opened sur prise pair wheels appeared approximately correct size given note cashier showing price about half value US paid exit began pay particular attention con tents balsa bins Never have seen such large quantity balsa except Sig warehouse place must have major balsa supplier France Examined closely noticed some balsa sticks familiar square rectangular shapes round dowels vari ous diameters would have liked ask purpose language barrier terminated con versation Im going flying words conjure up images battles balky engines instead carefree days field youre using McDaniel R/C NiStarterTM light plug NiStartersTM heavy-duty nicad power will provide up 50 reliable quick starts charge features famous Head LockTM adapter brass reinforcing ring around crimped end really extends ifs life works sideways inverted information well NiStarter works just go local flying field may have wait Ni-StartersTM always flying latest project workshop new Douglas M-2 Mailplane needed pair curved exhaust pipes -in diameter 33 long After checking weight aluminum tubing finding pair would weigh about six ounces also local tubing suppliers wanted sell minimum order $50 seemed prudent choose alternate material decided pipes should made balsa reminded Paris hobby shop its supply round balsa faced pros ____________________________________________________________[v32][b20951511171800]] pect having make some -in-diameter long balsa dowels Starting square sticks slightly oversize A2 table saw set 450 corners ATT- CHEIC1 removed square produce oc tagonal shape equal sides blade reset 22o corners removed toONBoard~ Battery Tester produce 16-sided nearly round sticks needed pushed through /2 inSaves Time . s Models diameter hole drilled steel plate shave shape perfectly round dowel smallerInstall RC Models Check receiver battery status diameters saw isnt required Just push square balsathroughsuccessivelysmallerholesinametalwith press button Small Light 1/2 oz plate few strokes sandpaper wrappedPrecise Rugged around dowel smooths surface Douglas pipes curved soak- AlT-CHEK RX-1 ORDER TODAY ing hot water about minute drying being held curved shape $1495 dealer pinning plank over-bent bit allow some spring-back hollow aft end ofProtune Corp 914 462-6452 shortPO Box 1808 Poughkeepsie NY 12601 pipe simulated grafting piece aluminum tube bored out very thin wall forward ends tapered six short stacks side extending 12 cylinders dummy Liberty engine stacks May1987 45 L McDaniel RIC] Incorporated 12206 Guinevere Road Glenn Dale MD 20769 301/464-2260 Tetex 287901 McD-UR take hassle out hobby Made USA New Continued page 150 Mailpianes dummy exhaust pipes support clamp mounts rigid post anchored plywood Pilots boarding step vacuumformed styrene sheet Al Featuring fast service qualified eopIe latest equipment including SPECTRUM ANAL YZER AM FM SIGNAL GENERATOR Call Sam Leonard Tony Stiliman custom work competition needs stock complete hobby line specializing competition accessories discounted prices 904 478-6746 RADIO SOUTH~ AUTHORIZED SERVICE CENTER FOR Iruft Pro Line II Futile 43 West Nine Mile Rd Pensacola FL 32514 Krn * Sales Service er Inquiries Welcome * RC Scale/Wischers Continued page 45 5/s-in birch dowels fastened balsa pipe Slow-let forms fillet simulate welds prototype Because Liberty 450 V-type dowel ends beveled 220 sanding disc alignment Wood screws driven birch dowels hold pipe cowl sides Actual exhaust models Enya 1 20 led out cowl bottom muffler located beneath engine bearers External balsa details model subject damage unless surfaces hardened pipes given coat clear dope followed heavy coat Ditzler primer sanded smooth pipes painted aluminum epoxy final finish Floquil Grimy Black model railroad paint applied very lightly Badger adjustable airbrush alu minum isnt quite completely hidden few squirts Floquil Rust strategic locations adds ultimate touch realism gleaned photos original airplane As prototype pipes held fuselage sides semicircular clamps standoff posts fastened internal ply wood plates means screws strong mounts models 12-lb weight can lifted pipes dont want falling off flight engine vibration Models birch dowel fuselage construction simulating steel tubes full-size airplane seen often recently Wherever dowels visible through open cockpit window must agreed realism has achieved method Birch dowel isnt very light wonder balsa couldnt have substituted Douglas has square balsa longerons its fuselage could have round balsa little forethoughtand no sacrifice strength exernal corners longerons sanded round give appearance tubular shape under covering material Could reason large stock round balsa Paris shop Cooling Unlike models WW II fighters ancient Douglas Mailplane has overabundance opening front cooling air entry ever doesnt mean engine will run cool desired Air will take path least resistance entering air wasted because will find way outlet easiest route rather through cooling fins models engine Scale models com pletely cowled submerged engines sus ceptible overheating problems Abused engines arent uncommon Sometimes intentional grounds engine can sacrificed interest Scale appearance fewer flights baffle needed direct air through fins engine Douglas done very simple plywood piece stands verti cally over engine near cylinder centerline Its internal cutout fits engine shape exter nal shape fits walls engine compartment Small plywood blocks form slot baffle inserted can easily removed engine servicing baffle fits engine closely couple points Elsewhere considerable gap varying up tal cowl opening eight times great space between engine baffle actually pressure buildup prop blast models forward motion baffles front sur face principle pressure cowl used almost air-cooled engines full-size aircraft engines air velocity ac celerated through fins restriction greatest Once past restricted space air expands increase cooling effect may seem strange improve cooling reducing air flow Its matter directing flow maxi mum efficiency louvered cowl Douglas also helps increase cooling effectiveness Behind 133 louvers drop pressure because louver really airfoil Due pressure drop air accelerated through louver open ing comparable lip formed cowls air-cooled aircraft just forward air exit exit vent normally located cowl bottom Air carried inward through front openings up over top engine downward through baffles surrounding cylinders exits down through lower vent slipstream model lou ver opening 04 sq Multiplied 133 total exit area about 53 sq 16 sq entry area 53 exit engine cooling would very poor no baffle pre sent Now four-stroke engine has become popular Scale modeling have another heatsource problemthe engines exhaust Restrict airflow too tightly around cylinder result may overheated exhaust pipe may char adjacent wood four-strokes fuel economy much greater because com plete combustion leads higher exhaust temperature two-stroke engines too concerned muffler pipe touched wood some point exhaust system four-stroke pipe muffler must isolated especially area nearest engines exhaust port may necessary leave opening baffle direct flow air over hottest parts pipe muffler hidden 150 Model Aviation Connectors Designed anything electrical requiring quick disconnects Ideol Power Pock Conneclor electrIc planes cars boats Designed high vibration environment Cycled ten Ihousond times electrical tailure IUJ Anderson Power Products Inc SORRY NO PERSONAL CHECKS OR COD ORDERS Only certitied checks money orders occepted Minimum order $1000 Three pockoges ot 4 Powerpoles $300 per pockoge plus $100 ship ping ond hondling CT residents odd 75% soles fox Prices sub]ecf fo chonge nof ice Dealer InquIrIes Invited further intormotion dealer prices send SASE ond Bus Cord SERMOS RIC SNAP CONNECTORS Cedar Corners Station Box 16787 Stamford CT 06905 separate compartment space will also need supply air exit Use heat sink radiate high metal temperature proximity wood Three-view sources Bill Hannan prolific writer magazine columns articles books latest work book Peanuts Pisrachios primarily intended builders small rubberpowered Scale models However book may special interest Scale modelers cause contains five three-view drawings can used build size airplane model Anyone owns plans acquire two-cylinder four-stroke engines cur rently attractive may have searching three-view drawings aircraft having such power plant Bills book two such prototypes depicted 1924 low-wing Bristol Brownie 1935 mid-wing Farman F450 long-nose Moustique Both have exposed two cylinders make ideal subjects power OS Saito twin Aside British Hawker Cygnet US Welch Aeronca series too two-cylinderpowered aircraft suitable using four-strokes provide reasonably scalelike appearance Both Bristol Farman relatively simple air craft other drawings Bills book include 1926 Farman Sport La Carte Postale Post Card parasol monoplane named because its wing shape has aspect ratio about 21 Another its distinctive features novel six-cylinder radial engine actually pair threecylinder radials placed back-to-back similar Curtiss Challenger Also included drawings 1932 Gee Bee R-l racer Flying Barrel 1935 Corben Super Ace latter betterlooking early home-builts featured serialized construction article Popular Avi ation magazine era powered four-cylinder Ford Model engine Write W C Hannan Graphics PO Box Escondido CA 92025 1938 Steve Wittman built flew early Bonzo racer Thompson Trophy race primitive-appearing airplane labeled Back yard Racer press days Steve used immense 12-cylinder V-type Curtiss D-12 engine nominal 400 horsepower originally made Curtiss P-I pursuit racer now part EAA Museum Oshkosh recently restored restoration crew enterprising Scale mod eler Bob Sonnleitner proceeded make sketches record dimensional data work carried out Steve Wittman lives Oshkosh airport border restoration nearly authentic possible Bob converted data completely accu rate pair drawings one-inch-to-one-foot scale two sheets 24 x 36 five exterior views intemal structure Price set $13 postpaid US rolled draw ings mailing tube modeler wants bit nostalgia history days unlimited glory air racing Bob Dolly Wiseher S-22 Lapham Peak Rd Delafleld WI 53018 RC Soaring/Blakeslee Continued page 47 design called Virga Fortunately us John top F3B competitors quite willing share hard-earned information trouble dont have time write down what know indeed indebted John giving us following article mechanical aspects launching has promised additional articles airplane design F3B flying F3B competition flier required supply own launch system obvious competitor needs best launch system can afford legal according rules point will describe several systems used 1986 F3B Finals hope will give aspiring F3B fliers starting point selection launch system Motors important part launch system motor main rule requirements motors have physical size Check rule book two motors currently being used country popular F3B fliers first modified Ford long-shaft motor stock Ford starter motor used 98% countrys winches AMA events competitive F3B modifying relatively inexpensive motor some competitors have come up competitive system common mods clude adding extra field coils using better brushes balancing adding needle bearings output side shaft standard mods can performed good starter-rebuilding shop around $70 additional mods motor common knowledge Modified Ford motors used some members team Synergy Another motor used F3B competitors motor designed built DGM racing car starters motor designed specifically past USA F3B teams has used sev May1987 151 Continued page 154 ZMA Name Street Address City StateZip