Radio Contml Scale Bob & Dolly Wischer FOUR-STROKE ENGINES visit ing England last summer intro duced new us Laser four-stroke engines Two engines single-cylinder valve-in-head types 61 75 cu displacement Most interesting Scale modelers viewpoint Laser 120 twin V-type two carburetors bar-stock engines no castings twin has extremely low idle speed showed no hesitation acceleration Fuel 20% castor oil no nitro needed Special glow plugs arent required British modelers understandably enthused about new four-stroke engines subject four-strokes now highly favored Scale models com mon problem tendency backfire either lean mixtures flooding engine loaded fuel before apply ing power glow plug backfire may occur engine may run back ward few revolutions sud denly reverse itself correct direc tion happens stop engine tighten prop nut remove prop examine its back surface have found serrations front surface hub will cut circular groove prop well prop shows clear-cut deep impressions drive hub restore damaged prop usefulness after has chewed drive hub lay flat surface pour epoxy groove propeller four-stroke engine isnt properly tightened firing compression impulses crank shaft combined inertia heavy prop will tend set up slight move ment interface between prop hub full-size airplanes can cause heat generated interface extent wood will char turn causes acceleration loosening process heat charring leading catastrophic failure type failure unlikely models because mass prop too small comparison full-size worst can happen previouslydescribed wearing away wood eventually can lead prop spinning free has happened us prop came off flight prop found repaired epoxy groove described expensive sleeved nut washer 0S Gemini gone forever consider good fortune didnt happen flight line people gathered around tendency also regard four-stroke engine being rather benign nature because runs quietly lower speed few calculations determine ac tual prop tip velocity revealing 60 two-stroke 11-in prop turning 11000 rpm has tip velocity 360 mph 120 four-stroke 16-in prop turning 9000 rpm has tip velocity 430 mph wouldnt like nicked either four-stroke could easily remove some necessary body parts large 18-in prop 6000 rpm Hiding fuel fill vent lines stiil allowing easy access can real sinunless run out bottom cowl fuii-scaie planes some vent tubes bottom olBobs Pober Pixie L cowl removed show plumbing Phone jack center connector external glow plug battery Extending fuselage structure forward cowl R shortens engine mounts fuel line moves tank fuel weight forward Cliff Tacles -scale cilppedwlng Cub L derived Sig kit uses Os GeminI 120 cu 4stroke twin Outstanding finish Sig butyrate dope over Super Coverite Craft weighs 31/4 lb Al Kretz scratch-built Spitfire Mk VIII R has balsalply structure glee scioth covering K&B epoxy finish Engine Kraft 61 model features complete cockpit operational flaps retracts 44 Model Aviation has tip velocity 310 mph Add mass large heavy prop easily stopped finger two have makings catastrophe large four-stroke gentle engine News USSR second time since Scale World Championships begun USSR can expected send RC competitors 1986 past entry single unsuc cessful ducted fan airplane 1976 championship neighboring Sweden Next years meet will also hosted neighbor Norway have heard through grapevine will Soviet entries Expect all-out effort win have done Control Line Scale dont like compete unless some assurnce placing high Drawing sources Dick Gleasons new enlarged catalog three-view Scale model drawings has number listings previou1y out print now offers reproductions old Hobby Helpers full-size model construction drawings some classics cluded Hollingers Cub Aeronca Champ Cal Smiths last Monocoupe Fokker D-VIII Dollys Pilatus Porter PC-6 Yeti Dick has also added several thousand three-view drawings already long list anyone interested superdetailing models engine offers draw ings copied engine overhaul manuals Continued page 142 Englands fine new Laser 4-stroke engines 1 single-cylinder comes 61 75 Cu versions whIch weigh 23 oz V-twin R has 2 carbs very iow idie exceiient throttie response No need use nitro fuei Engines machined solid bar stock use no castings Singiecyiinder ones have strokes 875 bores 937 61 104 75. BALSA SHEETS364830 1/16233 3/32240 1/6 243 3/16249 1/4 256 1/32337 1/20337 1/163374931 3/323445837 1/5 35471 3/1636262 1/4 3739561 5/16365 3/6 36612471 1/2 3110155 3/4 3165 1/164587648 3/324709456 1/8 45010666 3/1649312275 1/4 411013464 9/8 4165225 1/2 4225261 MATCHED SHEETS 42 31324100 1/64106 3/164120 1/44131 BALSA STICKS 1/16 1/4 1/16 3/6 1/16 1/2 3/32 1/4 3/32 3/6 3/32 1/2 1/6 1/8 1/9 1/4 1/6 3/8 1/6 1/2 3/163/16 3/16 3/8 3/16 1/2 1/4 1/4 1/4 3/6 1/4 1/2 1/4 3/4 1/41 5/16 5/16 3/B 3/6 3/8 1/2 3/9 3/4 3161 1/2 1/2 1/2 3/4 1/21 5/6 5/8 3/4 3/4 36 48 09 10 14 10 12 16 08 11 12 18 16 11 17 22 16 13 21 34 40 21 26 27 32 42 50 52 36 46 62 56 48 67 BALSA HOT LINE Call 806 745-6394 10 am-6pm Central lime BALSA T9IANGLES36 1/41/425 3/83630 1/211234 3/43/445 1c 155 BALSA PLANKS36 1185 12150 13200 14280 11/23275 11/24360 22225 23325 24435 33495 34668 TAPERED SHEETS36 1/4265 1/4365 3/6266 3/6398 1/23120 LONE STAR EPOXY 9,Ljt695 54596 15 ,i588 30 ,/,596 36 49 49 49 56 67 76 55 115 139 220 390 76 91 190 117 136 207 262 TRAILING EDGE36 1/4132 5/161 1/439 3/61 1/246 1/2270 INSTANT GLUE 1 , Thick298 1 z TSI258 L 2 Thick550 2z TSi550 8ASSWOOO48 3/16311626 3/161430 3/163/836 3/161/246 3/163/460 1/41/442 1/43/649 1/43/460 3/63/560 3/61/270 3/53/490 1/21/290 1/23/4100 BUNDLE DEALS 201/6336685 201164361020 203/32 336645 1 53/32 55 151/8336715 101/8436675 103/16336900 103/16436610 101/4336630 101/4436694 103/8336850 53/8436625 51/2336540 51/2436855 103/32448845 51/8448485 53/16446565 51/4448625 SINE STICKS 1/61/6 1/61/4 1/63/6 3/16 3/16 3/16 3/8 3/161/2 1/4 1/4 1/43/8 1/41/2 3/8 3/6 3648 13 1623 20 1724 2332 30 2637 3042 3447 3752 SPRUCE STICKS 3648 1/6 1/615 1/8 1/41824 1/6 3/820 3/163/162534 1/4 1/43145 1/4 3/63650 3/8 3/84563 3/6 1/25570 1/2 1/26080 1/2 3/46688 SPRUCE TRIANGLE 36 3/83/845 1/21/261 3/43/477 L/TE PLY 46 1/86 1/812 150 300 HARD MAPLE 18 1/4 3/8 3/6 3/8 3/8 1/2 3/63/4 1/23/4 40 45 50 58 66 BIRCH DOWELS36 1/006 3/1611 1/414 5/1625 3/632 3 PLY 8/RCH 48 1/6412 1/3212 1/1612 1/8 12 525 425 435 450 SPLY8/RCH 46 3/3212570 1/612565 3/1612565 1/412680 GROOVED LG MOUNTS 12 ic5, 3/83/4/1/6/40 3/83/4/5/32/40 1/23/413/16/45 LONE STAR MODELS Handling Charge$300 pay UPS Add $200 COD $300 extra PP APO FPO 1623 S7th St Lubbock TX 79412 Wa,eolVisa MasteCad oeroalchecksoCOO4-1/6% lajnTeas UScrc,vnIv MiimumOrdecS10G0 WE ARE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only CUSTOM CUT CONTEST BALSA Sheets Piece ed Ciose Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 46 LB 1/323 1/203 1/103 3/323 1/83 3/163 1/43 3/63 1/23 3/43 13 1/164 3/324 1/64 3/164 1/44 3/84 1/24 May 1985 45 *ark check*money order please* LARGE SASE FOR PRICE LISt IIA2YXI/7Y •BOX 1686 ER 82520 Engines/KiIsdOflk Continued page 139 dry off engine literally flood oil Carefully reinstall removed parts engine ready run Please note necessary remove piston cylinder crank bearings cases key doing damage engine course physical damage crankcase front cover crankshaft then-further disassembly will necessary should done very carefully methodicallyand possible under watchful eye engine specialist concludes series hope has helped some way lot top ics discussed emphasis primarily essentials Most topics could expanded much greater depth enough interest shown personal note course preparing series shocking realization People have hobby several decades such myself take awful lot granted dealing newcomers things second nature never realize never impart novice Perhaps anyone three decades experience should think about repaying debt owe fun have hobby would defi nitely encourage fraternity get involved growth hobby Help new people own way Give building lessons flying lessons con duct clinics seminars tech talks meet ings get involved AMA write articles like Share experience RC Scale/Wischers Continued page 45 descriptive data sheets also has reproductions drawings air craft engines shown 1934 Air Commerce Aircraft Year Book Sixty-one model drawings Paul Lindberg gas rubber-powered Popular via tion magazine listed 54 Earl Stahl Scale plans MAN Air Trails Air Age Catalog price $100 Gleason Enterprises 170429th Ave SE Rt 2 Box 125 Austin MN 55912 Detailed Scale multi-view drawings being produced documentation niodel design Curtiss Jenny JN-4 Taylor Brothers Chummy North American Mustang P-51B C drawings available three scale ratios /16 /14 % /16 ratio drawing size 24 x 36 Jenny drawing represents JN-4 flown Neta Snook used airplane flight training Amelia Earhart Taylor Chummy CG Taylors earli est design led development Cub eventually known Piper Cub its early form airplane open cockpit radial engine Photos Chummy also offered Mustang drawings four sheets made factory blueprints North American documents Aerodynamic Dimensional Data P-s 1 B/C Airplanes details prices send SASE Charles L Neely 2703 E Goshen Ave Visalia CA 93291 Fuel apparatus Providing fuel engine would appear rather simple matter Scale models completely enclosed engine fuel tank may complexities undesirable disassemble airplane fuel servicing portion cowling can made removable provided no objection non-scale lines filler tube becomes accessible full-size air plane already has hatch openings its nose can used fuel supply en trances Most aircraft have no such con venient spots hide necessary plastic tubes therefore obliged search another method airplanes having completely cowled engine run fuel fill vent tubes out bottom rear cowl area cooling air engine normally exhausted pro totype well model small bit tube can seen space isnt really non-scale because full-size planes often have tubes extending battery-box vent fuel tank overflow typical model system now has three tubes tank feed carbure tor two extending downward tank filling venting fuel being pumped model operation connect electric fuel pump lower tube pair entering tank use upper tube air vent fuel begins run vent tube signals full tank avoid spilling fuel length tube can connected vent line carry excess fuel back supply bot tle As tank nears capacity bubbles appear tube signal stopping pump return line bottle pre vents spilling raw fuel grass beneath model Fuel kills grass club field has row dead spots pit area models fueled Aimost us now using muffler pressure tank promote reliable fuel flow adds complication system tee needed vent tube connected muffler tap Unless both fill vent tubes plugged muffler pressure lost engine operating prevent loss insert machine screw 4-40 x 14 tube ends after filling Because electric fuel pump will fill tank faster rate fuel can vented through overflow tube some risk will considerable 142 Model Aviation ROADRI JNNEP 90 SPAN* 60-1 1 2 TO 14 LBS V 95 BALSAPLY---t-DIVE LG $129 ROLLED PRINTS W/MANJAL PP USA PRINTSROLLED W/MAIIJAL $2OU 1/420 X 2 NYLCN BOLTSPAN OR HEX 50-$4 50 PP USA 100-$7 00 PP USA 1/4-32 TAP gbplug PP BULK DISC DUBROROCKET CITYETC 00STENYA FIBER GLASS PUSH RODS PRECISION SAND AND SHAPE With. 4 1/2 Custom Aluminum iN i Extrusion Sanding Block TEE BAREspecially designed small sandingiobs Sander Pack contains 3 sheets assorted die-cut sandpaper Regular lengthDouble length 10 718 21 718 handy useTEE bigger L3AR4 jobs truer surfaces Regular ji Double Self Adhesive Sheet SandpaperEU Customize yourSTUFF sanding like pros 369s 11 sheets per pack 12-medium 12-fine 12-superfie per sheet U Post add 20% Catalog256 LAPPLIED DESIGN CORP 738 Penn St ElSegundo CA90245 THE JC TRAINERS Build half time Jig built balsa fuselage 90% built wing Full size plans Decal forms windshield Encellent instructions first time builder 60 Size 40 Size 20 Size Regular $8995SPECIAL $7995 Regular $7995SPECIAL $5995 Regular $5495SPECIAL $3995 Ootional Soort Wino Versions Available flow carburetor due pressure build-up full tank upright engine flooding can result sidemounted inverted engine fuel may dumped inside cowl car buretor can avoided stopping pump first bubbles appear vent tube fuel tube car buretor now full engine automatically primed ready starting Fill vent tubes must identified some way fuel never pumped muffler through tee connection tank made sheet brass tinplated steel can shaped fit size fuselage Three brass tubes soldered its forward surface fuel line fill vent advantages cus tom-made tank fill tube can bent downward its end rests tank bottom can used both filling emptying course tube must plugged immediately after filling fuel will siphon until tank empty principal reason making tank get shape will fit under cowl its being visible inside cockpit Four last six Scale models have tanks made 005-in brass assem bled soldering have shapes fit fuselage maximum capacity have V-bottoms fuel can evacuated after flying Brass erodes fuel suspected fuel remain ing brass tank could eventually cause leaks tank Emeraude now 14 years old has clunk-weighted sili cone internal tube fuel pickup tube has never changed worry times sound weight bouncing off brass walls reassuring final soldering operation assem bling tank seals tube inside perma nently now find hard believe silicone pickup tube inside fuel tank needs replaced periodically tank emptied after flying session During design stages building new model first considerations should fuel tank location tank stallation must afterthought cases has necessary build fuselage structure extension inside models engine cowl order get tank far forward possible done weight distribution avoid adding nose weight keep fuel line short rarely practicable locate tank optimum position its center 1/2 below needle valve Mounting engine angle side permits some variation needle valve location angle also deter mined some extent muffler Muffler pressure helps smooth out minor difficulties arise tank being mounted too low Viewing bottom cowl what see pair silicone tubes held place aluminum clamps wood screws Between tubes aluminum bracket miniature phone jack Radio Shack 274-253 connection starting battery glow plug Use heavy wire connectionNo 18 preferred wire starting bat tery will have miniature phone plug Radio Shack 274-286 brings ser vicing central point almost invisible yet easily accessible Scale appearance preserved Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Soaring/Pruss Continued page 47 high-strung competition ships events leave cold dont feel youre alone Moreover family commitments work schedule dont allow meet weekend crowd dont get guilt feelings spite heavy coverage column gives glamour events ships scribe tries remember still hobby Bob Johnson Wisconsin helped remind presentation Hun dred Minute Club Considering abovebut still admit ting little competitive blood veinsBob offered program satis fies yen anyone likes little challenge wishes keep sport low-key Continued page 146 May1985 143 SPECIAL THIS MONTH ONLY! 0 Ready Built 1/64 Plywood Covered Wing 60 SIZE40 SIZE SUPER LUCKYLITTLE SUPER FLYIILUCKYFLYII REG $13995 REG $11995 SPECIAL S99 95 SPECIAL 8995 60 Super Lucky Fly II 40 Little Super Lucky Fly II both superb air craft sport pattern flyers Prealigned fuselage foam wing 1164 plywood covering makes either Lucky Fly easy build easy fly
Edition: Model Aviation - 1985/05
Page Numbers: 44, 45, 142, 143
Radio Contml Scale Bob & Dolly Wischer FOUR-STROKE ENGINES visit ing England last summer intro duced new us Laser four-stroke engines Two engines single-cylinder valve-in-head types 61 75 cu displacement Most interesting Scale modelers viewpoint Laser 120 twin V-type two carburetors bar-stock engines no castings twin has extremely low idle speed showed no hesitation acceleration Fuel 20% castor oil no nitro needed Special glow plugs arent required British modelers understandably enthused about new four-stroke engines subject four-strokes now highly favored Scale models com mon problem tendency backfire either lean mixtures flooding engine loaded fuel before apply ing power glow plug backfire may occur engine may run back ward few revolutions sud denly reverse itself correct direc tion happens stop engine tighten prop nut remove prop examine its back surface have found serrations front surface hub will cut circular groove prop well prop shows clear-cut deep impressions drive hub restore damaged prop usefulness after has chewed drive hub lay flat surface pour epoxy groove propeller four-stroke engine isnt properly tightened firing compression impulses crank shaft combined inertia heavy prop will tend set up slight move ment interface between prop hub full-size airplanes can cause heat generated interface extent wood will char turn causes acceleration loosening process heat charring leading catastrophic failure type failure unlikely models because mass prop too small comparison full-size worst can happen previouslydescribed wearing away wood eventually can lead prop spinning free has happened us prop came off flight prop found repaired epoxy groove described expensive sleeved nut washer 0S Gemini gone forever consider good fortune didnt happen flight line people gathered around tendency also regard four-stroke engine being rather benign nature because runs quietly lower speed few calculations determine ac tual prop tip velocity revealing 60 two-stroke 11-in prop turning 11000 rpm has tip velocity 360 mph 120 four-stroke 16-in prop turning 9000 rpm has tip velocity 430 mph wouldnt like nicked either four-stroke could easily remove some necessary body parts large 18-in prop 6000 rpm Hiding fuel fill vent lines stiil allowing easy access can real sinunless run out bottom cowl fuii-scaie planes some vent tubes bottom olBobs Pober Pixie L cowl removed show plumbing Phone jack center connector external glow plug battery Extending fuselage structure forward cowl R shortens engine mounts fuel line moves tank fuel weight forward Cliff Tacles -scale cilppedwlng Cub L derived Sig kit uses Os GeminI 120 cu 4stroke twin Outstanding finish Sig butyrate dope over Super Coverite Craft weighs 31/4 lb Al Kretz scratch-built Spitfire Mk VIII R has balsalply structure glee scioth covering K&B epoxy finish Engine Kraft 61 model features complete cockpit operational flaps retracts 44 Model Aviation has tip velocity 310 mph Add mass large heavy prop easily stopped finger two have makings catastrophe large four-stroke gentle engine News USSR second time since Scale World Championships begun USSR can expected send RC competitors 1986 past entry single unsuc cessful ducted fan airplane 1976 championship neighboring Sweden Next years meet will also hosted neighbor Norway have heard through grapevine will Soviet entries Expect all-out effort win have done Control Line Scale dont like compete unless some assurnce placing high Drawing sources Dick Gleasons new enlarged catalog three-view Scale model drawings has number listings previou1y out print now offers reproductions old Hobby Helpers full-size model construction drawings some classics cluded Hollingers Cub Aeronca Champ Cal Smiths last Monocoupe Fokker D-VIII Dollys Pilatus Porter PC-6 Yeti Dick has also added several thousand three-view drawings already long list anyone interested superdetailing models engine offers draw ings copied engine overhaul manuals Continued page 142 Englands fine new Laser 4-stroke engines 1 single-cylinder comes 61 75 Cu versions whIch weigh 23 oz V-twin R has 2 carbs very iow idie exceiient throttie response No need use nitro fuei Engines machined solid bar stock use no castings Singiecyiinder ones have strokes 875 bores 937 61 104 75. BALSA SHEETS364830 1/16233 3/32240 1/6 243 3/16249 1/4 256 1/32337 1/20337 1/163374931 3/323445837 1/5 35471 3/1636262 1/4 3739561 5/16365 3/6 36612471 1/2 3110155 3/4 3165 1/164587648 3/324709456 1/8 45010666 3/1649312275 1/4 411013464 9/8 4165225 1/2 4225261 MATCHED SHEETS 42 31324100 1/64106 3/164120 1/44131 BALSA STICKS 1/16 1/4 1/16 3/6 1/16 1/2 3/32 1/4 3/32 3/6 3/32 1/2 1/6 1/8 1/9 1/4 1/6 3/8 1/6 1/2 3/163/16 3/16 3/8 3/16 1/2 1/4 1/4 1/4 3/6 1/4 1/2 1/4 3/4 1/41 5/16 5/16 3/B 3/6 3/8 1/2 3/9 3/4 3161 1/2 1/2 1/2 3/4 1/21 5/6 5/8 3/4 3/4 36 48 09 10 14 10 12 16 08 11 12 18 16 11 17 22 16 13 21 34 40 21 26 27 32 42 50 52 36 46 62 56 48 67 BALSA HOT LINE Call 806 745-6394 10 am-6pm Central lime BALSA T9IANGLES36 1/41/425 3/83630 1/211234 3/43/445 1c 155 BALSA PLANKS36 1185 12150 13200 14280 11/23275 11/24360 22225 23325 24435 33495 34668 TAPERED SHEETS36 1/4265 1/4365 3/6266 3/6398 1/23120 LONE STAR EPOXY 9,Ljt695 54596 15 ,i588 30 ,/,596 36 49 49 49 56 67 76 55 115 139 220 390 76 91 190 117 136 207 262 TRAILING EDGE36 1/4132 5/161 1/439 3/61 1/246 1/2270 INSTANT GLUE 1 , Thick298 1 z TSI258 L 2 Thick550 2z TSi550 8ASSWOOO48 3/16311626 3/161430 3/163/836 3/161/246 3/163/460 1/41/442 1/43/649 1/43/460 3/63/560 3/61/270 3/53/490 1/21/290 1/23/4100 BUNDLE DEALS 201/6336685 201164361020 203/32 336645 1 53/32 55 151/8336715 101/8436675 103/16336900 103/16436610 101/4336630 101/4436694 103/8336850 53/8436625 51/2336540 51/2436855 103/32448845 51/8448485 53/16446565 51/4448625 SINE STICKS 1/61/6 1/61/4 1/63/6 3/16 3/16 3/16 3/8 3/161/2 1/4 1/4 1/43/8 1/41/2 3/8 3/6 3648 13 1623 20 1724 2332 30 2637 3042 3447 3752 SPRUCE STICKS 3648 1/6 1/615 1/8 1/41824 1/6 3/820 3/163/162534 1/4 1/43145 1/4 3/63650 3/8 3/84563 3/6 1/25570 1/2 1/26080 1/2 3/46688 SPRUCE TRIANGLE 36 3/83/845 1/21/261 3/43/477 L/TE PLY 46 1/86 1/812 150 300 HARD MAPLE 18 1/4 3/8 3/6 3/8 3/8 1/2 3/63/4 1/23/4 40 45 50 58 66 BIRCH DOWELS36 1/006 3/1611 1/414 5/1625 3/632 3 PLY 8/RCH 48 1/6412 1/3212 1/1612 1/8 12 525 425 435 450 SPLY8/RCH 46 3/3212570 1/612565 3/1612565 1/412680 GROOVED LG MOUNTS 12 ic5, 3/83/4/1/6/40 3/83/4/5/32/40 1/23/413/16/45 LONE STAR MODELS Handling Charge$300 pay UPS Add $200 COD $300 extra PP APO FPO 1623 S7th St Lubbock TX 79412 Wa,eolVisa MasteCad oeroalchecksoCOO4-1/6% lajnTeas UScrc,vnIv MiimumOrdecS10G0 WE ARE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only CUSTOM CUT CONTEST BALSA Sheets Piece ed Ciose Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 46 LB 1/323 1/203 1/103 3/323 1/83 3/163 1/43 3/63 1/23 3/43 13 1/164 3/324 1/64 3/164 1/44 3/84 1/24 May 1985 45 *ark check*money order please* LARGE SASE FOR PRICE LISt IIA2YXI/7Y •BOX 1686 ER 82520 Engines/KiIsdOflk Continued page 139 dry off engine literally flood oil Carefully reinstall removed parts engine ready run Please note necessary remove piston cylinder crank bearings cases key doing damage engine course physical damage crankcase front cover crankshaft then-further disassembly will necessary should done very carefully methodicallyand possible under watchful eye engine specialist concludes series hope has helped some way lot top ics discussed emphasis primarily essentials Most topics could expanded much greater depth enough interest shown personal note course preparing series shocking realization People have hobby several decades such myself take awful lot granted dealing newcomers things second nature never realize never impart novice Perhaps anyone three decades experience should think about repaying debt owe fun have hobby would defi nitely encourage fraternity get involved growth hobby Help new people own way Give building lessons flying lessons con duct clinics seminars tech talks meet ings get involved AMA write articles like Share experience RC Scale/Wischers Continued page 45 descriptive data sheets also has reproductions drawings air craft engines shown 1934 Air Commerce Aircraft Year Book Sixty-one model drawings Paul Lindberg gas rubber-powered Popular via tion magazine listed 54 Earl Stahl Scale plans MAN Air Trails Air Age Catalog price $100 Gleason Enterprises 170429th Ave SE Rt 2 Box 125 Austin MN 55912 Detailed Scale multi-view drawings being produced documentation niodel design Curtiss Jenny JN-4 Taylor Brothers Chummy North American Mustang P-51B C drawings available three scale ratios /16 /14 % /16 ratio drawing size 24 x 36 Jenny drawing represents JN-4 flown Neta Snook used airplane flight training Amelia Earhart Taylor Chummy CG Taylors earli est design led development Cub eventually known Piper Cub its early form airplane open cockpit radial engine Photos Chummy also offered Mustang drawings four sheets made factory blueprints North American documents Aerodynamic Dimensional Data P-s 1 B/C Airplanes details prices send SASE Charles L Neely 2703 E Goshen Ave Visalia CA 93291 Fuel apparatus Providing fuel engine would appear rather simple matter Scale models completely enclosed engine fuel tank may complexities undesirable disassemble airplane fuel servicing portion cowling can made removable provided no objection non-scale lines filler tube becomes accessible full-size air plane already has hatch openings its nose can used fuel supply en trances Most aircraft have no such con venient spots hide necessary plastic tubes therefore obliged search another method airplanes having completely cowled engine run fuel fill vent tubes out bottom rear cowl area cooling air engine normally exhausted pro totype well model small bit tube can seen space isnt really non-scale because full-size planes often have tubes extending battery-box vent fuel tank overflow typical model system now has three tubes tank feed carbure tor two extending downward tank filling venting fuel being pumped model operation connect electric fuel pump lower tube pair entering tank use upper tube air vent fuel begins run vent tube signals full tank avoid spilling fuel length tube can connected vent line carry excess fuel back supply bot tle As tank nears capacity bubbles appear tube signal stopping pump return line bottle pre vents spilling raw fuel grass beneath model Fuel kills grass club field has row dead spots pit area models fueled Aimost us now using muffler pressure tank promote reliable fuel flow adds complication system tee needed vent tube connected muffler tap Unless both fill vent tubes plugged muffler pressure lost engine operating prevent loss insert machine screw 4-40 x 14 tube ends after filling Because electric fuel pump will fill tank faster rate fuel can vented through overflow tube some risk will considerable 142 Model Aviation ROADRI JNNEP 90 SPAN* 60-1 1 2 TO 14 LBS V 95 BALSAPLY---t-DIVE LG $129 ROLLED PRINTS W/MANJAL PP USA PRINTSROLLED W/MAIIJAL $2OU 1/420 X 2 NYLCN BOLTSPAN OR HEX 50-$4 50 PP USA 100-$7 00 PP USA 1/4-32 TAP gbplug PP BULK DISC DUBROROCKET CITYETC 00STENYA FIBER GLASS PUSH RODS PRECISION SAND AND SHAPE With. 4 1/2 Custom Aluminum iN i Extrusion Sanding Block TEE BAREspecially designed small sandingiobs Sander Pack contains 3 sheets assorted die-cut sandpaper Regular lengthDouble length 10 718 21 718 handy useTEE bigger L3AR4 jobs truer surfaces Regular ji Double Self Adhesive Sheet SandpaperEU Customize yourSTUFF sanding like pros 369s 11 sheets per pack 12-medium 12-fine 12-superfie per sheet U Post add 20% Catalog256 LAPPLIED DESIGN CORP 738 Penn St ElSegundo CA90245 THE JC TRAINERS Build half time Jig built balsa fuselage 90% built wing Full size plans Decal forms windshield Encellent instructions first time builder 60 Size 40 Size 20 Size Regular $8995SPECIAL $7995 Regular $7995SPECIAL $5995 Regular $5495SPECIAL $3995 Ootional Soort Wino Versions Available flow carburetor due pressure build-up full tank upright engine flooding can result sidemounted inverted engine fuel may dumped inside cowl car buretor can avoided stopping pump first bubbles appear vent tube fuel tube car buretor now full engine automatically primed ready starting Fill vent tubes must identified some way fuel never pumped muffler through tee connection tank made sheet brass tinplated steel can shaped fit size fuselage Three brass tubes soldered its forward surface fuel line fill vent advantages cus tom-made tank fill tube can bent downward its end rests tank bottom can used both filling emptying course tube must plugged immediately after filling fuel will siphon until tank empty principal reason making tank get shape will fit under cowl its being visible inside cockpit Four last six Scale models have tanks made 005-in brass assem bled soldering have shapes fit fuselage maximum capacity have V-bottoms fuel can evacuated after flying Brass erodes fuel suspected fuel remain ing brass tank could eventually cause leaks tank Emeraude now 14 years old has clunk-weighted sili cone internal tube fuel pickup tube has never changed worry times sound weight bouncing off brass walls reassuring final soldering operation assem bling tank seals tube inside perma nently now find hard believe silicone pickup tube inside fuel tank needs replaced periodically tank emptied after flying session During design stages building new model first considerations should fuel tank location tank stallation must afterthought cases has necessary build fuselage structure extension inside models engine cowl order get tank far forward possible done weight distribution avoid adding nose weight keep fuel line short rarely practicable locate tank optimum position its center 1/2 below needle valve Mounting engine angle side permits some variation needle valve location angle also deter mined some extent muffler Muffler pressure helps smooth out minor difficulties arise tank being mounted too low Viewing bottom cowl what see pair silicone tubes held place aluminum clamps wood screws Between tubes aluminum bracket miniature phone jack Radio Shack 274-253 connection starting battery glow plug Use heavy wire connectionNo 18 preferred wire starting bat tery will have miniature phone plug Radio Shack 274-286 brings ser vicing central point almost invisible yet easily accessible Scale appearance preserved Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Soaring/Pruss Continued page 47 high-strung competition ships events leave cold dont feel youre alone Moreover family commitments work schedule dont allow meet weekend crowd dont get guilt feelings spite heavy coverage column gives glamour events ships scribe tries remember still hobby Bob Johnson Wisconsin helped remind presentation Hun dred Minute Club Considering abovebut still admit ting little competitive blood veinsBob offered program satis fies yen anyone likes little challenge wishes keep sport low-key Continued page 146 May1985 143 SPECIAL THIS MONTH ONLY! 0 Ready Built 1/64 Plywood Covered Wing 60 SIZE40 SIZE SUPER LUCKYLITTLE SUPER FLYIILUCKYFLYII REG $13995 REG $11995 SPECIAL S99 95 SPECIAL 8995 60 Super Lucky Fly II 40 Little Super Lucky Fly II both superb air craft sport pattern flyers Prealigned fuselage foam wing 1164 plywood covering makes either Lucky Fly easy build easy fly
Edition: Model Aviation - 1985/05
Page Numbers: 44, 45, 142, 143
Radio Contml Scale Bob & Dolly Wischer FOUR-STROKE ENGINES visit ing England last summer intro duced new us Laser four-stroke engines Two engines single-cylinder valve-in-head types 61 75 cu displacement Most interesting Scale modelers viewpoint Laser 120 twin V-type two carburetors bar-stock engines no castings twin has extremely low idle speed showed no hesitation acceleration Fuel 20% castor oil no nitro needed Special glow plugs arent required British modelers understandably enthused about new four-stroke engines subject four-strokes now highly favored Scale models com mon problem tendency backfire either lean mixtures flooding engine loaded fuel before apply ing power glow plug backfire may occur engine may run back ward few revolutions sud denly reverse itself correct direc tion happens stop engine tighten prop nut remove prop examine its back surface have found serrations front surface hub will cut circular groove prop well prop shows clear-cut deep impressions drive hub restore damaged prop usefulness after has chewed drive hub lay flat surface pour epoxy groove propeller four-stroke engine isnt properly tightened firing compression impulses crank shaft combined inertia heavy prop will tend set up slight move ment interface between prop hub full-size airplanes can cause heat generated interface extent wood will char turn causes acceleration loosening process heat charring leading catastrophic failure type failure unlikely models because mass prop too small comparison full-size worst can happen previouslydescribed wearing away wood eventually can lead prop spinning free has happened us prop came off flight prop found repaired epoxy groove described expensive sleeved nut washer 0S Gemini gone forever consider good fortune didnt happen flight line people gathered around tendency also regard four-stroke engine being rather benign nature because runs quietly lower speed few calculations determine ac tual prop tip velocity revealing 60 two-stroke 11-in prop turning 11000 rpm has tip velocity 360 mph 120 four-stroke 16-in prop turning 9000 rpm has tip velocity 430 mph wouldnt like nicked either four-stroke could easily remove some necessary body parts large 18-in prop 6000 rpm Hiding fuel fill vent lines stiil allowing easy access can real sinunless run out bottom cowl fuii-scaie planes some vent tubes bottom olBobs Pober Pixie L cowl removed show plumbing Phone jack center connector external glow plug battery Extending fuselage structure forward cowl R shortens engine mounts fuel line moves tank fuel weight forward Cliff Tacles -scale cilppedwlng Cub L derived Sig kit uses Os GeminI 120 cu 4stroke twin Outstanding finish Sig butyrate dope over Super Coverite Craft weighs 31/4 lb Al Kretz scratch-built Spitfire Mk VIII R has balsalply structure glee scioth covering K&B epoxy finish Engine Kraft 61 model features complete cockpit operational flaps retracts 44 Model Aviation has tip velocity 310 mph Add mass large heavy prop easily stopped finger two have makings catastrophe large four-stroke gentle engine News USSR second time since Scale World Championships begun USSR can expected send RC competitors 1986 past entry single unsuc cessful ducted fan airplane 1976 championship neighboring Sweden Next years meet will also hosted neighbor Norway have heard through grapevine will Soviet entries Expect all-out effort win have done Control Line Scale dont like compete unless some assurnce placing high Drawing sources Dick Gleasons new enlarged catalog three-view Scale model drawings has number listings previou1y out print now offers reproductions old Hobby Helpers full-size model construction drawings some classics cluded Hollingers Cub Aeronca Champ Cal Smiths last Monocoupe Fokker D-VIII Dollys Pilatus Porter PC-6 Yeti Dick has also added several thousand three-view drawings already long list anyone interested superdetailing models engine offers draw ings copied engine overhaul manuals Continued page 142 Englands fine new Laser 4-stroke engines 1 single-cylinder comes 61 75 Cu versions whIch weigh 23 oz V-twin R has 2 carbs very iow idie exceiient throttie response No need use nitro fuei Engines machined solid bar stock use no castings Singiecyiinder ones have strokes 875 bores 937 61 104 75. BALSA SHEETS364830 1/16233 3/32240 1/6 243 3/16249 1/4 256 1/32337 1/20337 1/163374931 3/323445837 1/5 35471 3/1636262 1/4 3739561 5/16365 3/6 36612471 1/2 3110155 3/4 3165 1/164587648 3/324709456 1/8 45010666 3/1649312275 1/4 411013464 9/8 4165225 1/2 4225261 MATCHED SHEETS 42 31324100 1/64106 3/164120 1/44131 BALSA STICKS 1/16 1/4 1/16 3/6 1/16 1/2 3/32 1/4 3/32 3/6 3/32 1/2 1/6 1/8 1/9 1/4 1/6 3/8 1/6 1/2 3/163/16 3/16 3/8 3/16 1/2 1/4 1/4 1/4 3/6 1/4 1/2 1/4 3/4 1/41 5/16 5/16 3/B 3/6 3/8 1/2 3/9 3/4 3161 1/2 1/2 1/2 3/4 1/21 5/6 5/8 3/4 3/4 36 48 09 10 14 10 12 16 08 11 12 18 16 11 17 22 16 13 21 34 40 21 26 27 32 42 50 52 36 46 62 56 48 67 BALSA HOT LINE Call 806 745-6394 10 am-6pm Central lime BALSA T9IANGLES36 1/41/425 3/83630 1/211234 3/43/445 1c 155 BALSA PLANKS36 1185 12150 13200 14280 11/23275 11/24360 22225 23325 24435 33495 34668 TAPERED SHEETS36 1/4265 1/4365 3/6266 3/6398 1/23120 LONE STAR EPOXY 9,Ljt695 54596 15 ,i588 30 ,/,596 36 49 49 49 56 67 76 55 115 139 220 390 76 91 190 117 136 207 262 TRAILING EDGE36 1/4132 5/161 1/439 3/61 1/246 1/2270 INSTANT GLUE 1 , Thick298 1 z TSI258 L 2 Thick550 2z TSi550 8ASSWOOO48 3/16311626 3/161430 3/163/836 3/161/246 3/163/460 1/41/442 1/43/649 1/43/460 3/63/560 3/61/270 3/53/490 1/21/290 1/23/4100 BUNDLE DEALS 201/6336685 201164361020 203/32 336645 1 53/32 55 151/8336715 101/8436675 103/16336900 103/16436610 101/4336630 101/4436694 103/8336850 53/8436625 51/2336540 51/2436855 103/32448845 51/8448485 53/16446565 51/4448625 SINE STICKS 1/61/6 1/61/4 1/63/6 3/16 3/16 3/16 3/8 3/161/2 1/4 1/4 1/43/8 1/41/2 3/8 3/6 3648 13 1623 20 1724 2332 30 2637 3042 3447 3752 SPRUCE STICKS 3648 1/6 1/615 1/8 1/41824 1/6 3/820 3/163/162534 1/4 1/43145 1/4 3/63650 3/8 3/84563 3/6 1/25570 1/2 1/26080 1/2 3/46688 SPRUCE TRIANGLE 36 3/83/845 1/21/261 3/43/477 L/TE PLY 46 1/86 1/812 150 300 HARD MAPLE 18 1/4 3/8 3/6 3/8 3/8 1/2 3/63/4 1/23/4 40 45 50 58 66 BIRCH DOWELS36 1/006 3/1611 1/414 5/1625 3/632 3 PLY 8/RCH 48 1/6412 1/3212 1/1612 1/8 12 525 425 435 450 SPLY8/RCH 46 3/3212570 1/612565 3/1612565 1/412680 GROOVED LG MOUNTS 12 ic5, 3/83/4/1/6/40 3/83/4/5/32/40 1/23/413/16/45 LONE STAR MODELS Handling Charge$300 pay UPS Add $200 COD $300 extra PP APO FPO 1623 S7th St Lubbock TX 79412 Wa,eolVisa MasteCad oeroalchecksoCOO4-1/6% lajnTeas UScrc,vnIv MiimumOrdecS10G0 WE ARE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only CUSTOM CUT CONTEST BALSA Sheets Piece ed Ciose Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 46 LB 1/323 1/203 1/103 3/323 1/83 3/163 1/43 3/63 1/23 3/43 13 1/164 3/324 1/64 3/164 1/44 3/84 1/24 May 1985 45 *ark check*money order please* LARGE SASE FOR PRICE LISt IIA2YXI/7Y •BOX 1686 ER 82520 Engines/KiIsdOflk Continued page 139 dry off engine literally flood oil Carefully reinstall removed parts engine ready run Please note necessary remove piston cylinder crank bearings cases key doing damage engine course physical damage crankcase front cover crankshaft then-further disassembly will necessary should done very carefully methodicallyand possible under watchful eye engine specialist concludes series hope has helped some way lot top ics discussed emphasis primarily essentials Most topics could expanded much greater depth enough interest shown personal note course preparing series shocking realization People have hobby several decades such myself take awful lot granted dealing newcomers things second nature never realize never impart novice Perhaps anyone three decades experience should think about repaying debt owe fun have hobby would defi nitely encourage fraternity get involved growth hobby Help new people own way Give building lessons flying lessons con duct clinics seminars tech talks meet ings get involved AMA write articles like Share experience RC Scale/Wischers Continued page 45 descriptive data sheets also has reproductions drawings air craft engines shown 1934 Air Commerce Aircraft Year Book Sixty-one model drawings Paul Lindberg gas rubber-powered Popular via tion magazine listed 54 Earl Stahl Scale plans MAN Air Trails Air Age Catalog price $100 Gleason Enterprises 170429th Ave SE Rt 2 Box 125 Austin MN 55912 Detailed Scale multi-view drawings being produced documentation niodel design Curtiss Jenny JN-4 Taylor Brothers Chummy North American Mustang P-51B C drawings available three scale ratios /16 /14 % /16 ratio drawing size 24 x 36 Jenny drawing represents JN-4 flown Neta Snook used airplane flight training Amelia Earhart Taylor Chummy CG Taylors earli est design led development Cub eventually known Piper Cub its early form airplane open cockpit radial engine Photos Chummy also offered Mustang drawings four sheets made factory blueprints North American documents Aerodynamic Dimensional Data P-s 1 B/C Airplanes details prices send SASE Charles L Neely 2703 E Goshen Ave Visalia CA 93291 Fuel apparatus Providing fuel engine would appear rather simple matter Scale models completely enclosed engine fuel tank may complexities undesirable disassemble airplane fuel servicing portion cowling can made removable provided no objection non-scale lines filler tube becomes accessible full-size air plane already has hatch openings its nose can used fuel supply en trances Most aircraft have no such con venient spots hide necessary plastic tubes therefore obliged search another method airplanes having completely cowled engine run fuel fill vent tubes out bottom rear cowl area cooling air engine normally exhausted pro totype well model small bit tube can seen space isnt really non-scale because full-size planes often have tubes extending battery-box vent fuel tank overflow typical model system now has three tubes tank feed carbure tor two extending downward tank filling venting fuel being pumped model operation connect electric fuel pump lower tube pair entering tank use upper tube air vent fuel begins run vent tube signals full tank avoid spilling fuel length tube can connected vent line carry excess fuel back supply bot tle As tank nears capacity bubbles appear tube signal stopping pump return line bottle pre vents spilling raw fuel grass beneath model Fuel kills grass club field has row dead spots pit area models fueled Aimost us now using muffler pressure tank promote reliable fuel flow adds complication system tee needed vent tube connected muffler tap Unless both fill vent tubes plugged muffler pressure lost engine operating prevent loss insert machine screw 4-40 x 14 tube ends after filling Because electric fuel pump will fill tank faster rate fuel can vented through overflow tube some risk will considerable 142 Model Aviation ROADRI JNNEP 90 SPAN* 60-1 1 2 TO 14 LBS V 95 BALSAPLY---t-DIVE LG $129 ROLLED PRINTS W/MANJAL PP USA PRINTSROLLED W/MAIIJAL $2OU 1/420 X 2 NYLCN BOLTSPAN OR HEX 50-$4 50 PP USA 100-$7 00 PP USA 1/4-32 TAP gbplug PP BULK DISC DUBROROCKET CITYETC 00STENYA FIBER GLASS PUSH RODS PRECISION SAND AND SHAPE With. 4 1/2 Custom Aluminum iN i Extrusion Sanding Block TEE BAREspecially designed small sandingiobs Sander Pack contains 3 sheets assorted die-cut sandpaper Regular lengthDouble length 10 718 21 718 handy useTEE bigger L3AR4 jobs truer surfaces Regular ji Double Self Adhesive Sheet SandpaperEU Customize yourSTUFF sanding like pros 369s 11 sheets per pack 12-medium 12-fine 12-superfie per sheet U Post add 20% Catalog256 LAPPLIED DESIGN CORP 738 Penn St ElSegundo CA90245 THE JC TRAINERS Build half time Jig built balsa fuselage 90% built wing Full size plans Decal forms windshield Encellent instructions first time builder 60 Size 40 Size 20 Size Regular $8995SPECIAL $7995 Regular $7995SPECIAL $5995 Regular $5495SPECIAL $3995 Ootional Soort Wino Versions Available flow carburetor due pressure build-up full tank upright engine flooding can result sidemounted inverted engine fuel may dumped inside cowl car buretor can avoided stopping pump first bubbles appear vent tube fuel tube car buretor now full engine automatically primed ready starting Fill vent tubes must identified some way fuel never pumped muffler through tee connection tank made sheet brass tinplated steel can shaped fit size fuselage Three brass tubes soldered its forward surface fuel line fill vent advantages cus tom-made tank fill tube can bent downward its end rests tank bottom can used both filling emptying course tube must plugged immediately after filling fuel will siphon until tank empty principal reason making tank get shape will fit under cowl its being visible inside cockpit Four last six Scale models have tanks made 005-in brass assem bled soldering have shapes fit fuselage maximum capacity have V-bottoms fuel can evacuated after flying Brass erodes fuel suspected fuel remain ing brass tank could eventually cause leaks tank Emeraude now 14 years old has clunk-weighted sili cone internal tube fuel pickup tube has never changed worry times sound weight bouncing off brass walls reassuring final soldering operation assem bling tank seals tube inside perma nently now find hard believe silicone pickup tube inside fuel tank needs replaced periodically tank emptied after flying session During design stages building new model first considerations should fuel tank location tank stallation must afterthought cases has necessary build fuselage structure extension inside models engine cowl order get tank far forward possible done weight distribution avoid adding nose weight keep fuel line short rarely practicable locate tank optimum position its center 1/2 below needle valve Mounting engine angle side permits some variation needle valve location angle also deter mined some extent muffler Muffler pressure helps smooth out minor difficulties arise tank being mounted too low Viewing bottom cowl what see pair silicone tubes held place aluminum clamps wood screws Between tubes aluminum bracket miniature phone jack Radio Shack 274-253 connection starting battery glow plug Use heavy wire connectionNo 18 preferred wire starting bat tery will have miniature phone plug Radio Shack 274-286 brings ser vicing central point almost invisible yet easily accessible Scale appearance preserved Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Soaring/Pruss Continued page 47 high-strung competition ships events leave cold dont feel youre alone Moreover family commitments work schedule dont allow meet weekend crowd dont get guilt feelings spite heavy coverage column gives glamour events ships scribe tries remember still hobby Bob Johnson Wisconsin helped remind presentation Hun dred Minute Club Considering abovebut still admit ting little competitive blood veinsBob offered program satis fies yen anyone likes little challenge wishes keep sport low-key Continued page 146 May1985 143 SPECIAL THIS MONTH ONLY! 0 Ready Built 1/64 Plywood Covered Wing 60 SIZE40 SIZE SUPER LUCKYLITTLE SUPER FLYIILUCKYFLYII REG $13995 REG $11995 SPECIAL S99 95 SPECIAL 8995 60 Super Lucky Fly II 40 Little Super Lucky Fly II both superb air craft sport pattern flyers Prealigned fuselage foam wing 1164 plywood covering makes either Lucky Fly easy build easy fly
Edition: Model Aviation - 1985/05
Page Numbers: 44, 45, 142, 143
Radio Contml Scale Bob & Dolly Wischer FOUR-STROKE ENGINES visit ing England last summer intro duced new us Laser four-stroke engines Two engines single-cylinder valve-in-head types 61 75 cu displacement Most interesting Scale modelers viewpoint Laser 120 twin V-type two carburetors bar-stock engines no castings twin has extremely low idle speed showed no hesitation acceleration Fuel 20% castor oil no nitro needed Special glow plugs arent required British modelers understandably enthused about new four-stroke engines subject four-strokes now highly favored Scale models com mon problem tendency backfire either lean mixtures flooding engine loaded fuel before apply ing power glow plug backfire may occur engine may run back ward few revolutions sud denly reverse itself correct direc tion happens stop engine tighten prop nut remove prop examine its back surface have found serrations front surface hub will cut circular groove prop well prop shows clear-cut deep impressions drive hub restore damaged prop usefulness after has chewed drive hub lay flat surface pour epoxy groove propeller four-stroke engine isnt properly tightened firing compression impulses crank shaft combined inertia heavy prop will tend set up slight move ment interface between prop hub full-size airplanes can cause heat generated interface extent wood will char turn causes acceleration loosening process heat charring leading catastrophic failure type failure unlikely models because mass prop too small comparison full-size worst can happen previouslydescribed wearing away wood eventually can lead prop spinning free has happened us prop came off flight prop found repaired epoxy groove described expensive sleeved nut washer 0S Gemini gone forever consider good fortune didnt happen flight line people gathered around tendency also regard four-stroke engine being rather benign nature because runs quietly lower speed few calculations determine ac tual prop tip velocity revealing 60 two-stroke 11-in prop turning 11000 rpm has tip velocity 360 mph 120 four-stroke 16-in prop turning 9000 rpm has tip velocity 430 mph wouldnt like nicked either four-stroke could easily remove some necessary body parts large 18-in prop 6000 rpm Hiding fuel fill vent lines stiil allowing easy access can real sinunless run out bottom cowl fuii-scaie planes some vent tubes bottom olBobs Pober Pixie L cowl removed show plumbing Phone jack center connector external glow plug battery Extending fuselage structure forward cowl R shortens engine mounts fuel line moves tank fuel weight forward Cliff Tacles -scale cilppedwlng Cub L derived Sig kit uses Os GeminI 120 cu 4stroke twin Outstanding finish Sig butyrate dope over Super Coverite Craft weighs 31/4 lb Al Kretz scratch-built Spitfire Mk VIII R has balsalply structure glee scioth covering K&B epoxy finish Engine Kraft 61 model features complete cockpit operational flaps retracts 44 Model Aviation has tip velocity 310 mph Add mass large heavy prop easily stopped finger two have makings catastrophe large four-stroke gentle engine News USSR second time since Scale World Championships begun USSR can expected send RC competitors 1986 past entry single unsuc cessful ducted fan airplane 1976 championship neighboring Sweden Next years meet will also hosted neighbor Norway have heard through grapevine will Soviet entries Expect all-out effort win have done Control Line Scale dont like compete unless some assurnce placing high Drawing sources Dick Gleasons new enlarged catalog three-view Scale model drawings has number listings previou1y out print now offers reproductions old Hobby Helpers full-size model construction drawings some classics cluded Hollingers Cub Aeronca Champ Cal Smiths last Monocoupe Fokker D-VIII Dollys Pilatus Porter PC-6 Yeti Dick has also added several thousand three-view drawings already long list anyone interested superdetailing models engine offers draw ings copied engine overhaul manuals Continued page 142 Englands fine new Laser 4-stroke engines 1 single-cylinder comes 61 75 Cu versions whIch weigh 23 oz V-twin R has 2 carbs very iow idie exceiient throttie response No need use nitro fuei Engines machined solid bar stock use no castings Singiecyiinder ones have strokes 875 bores 937 61 104 75. BALSA SHEETS364830 1/16233 3/32240 1/6 243 3/16249 1/4 256 1/32337 1/20337 1/163374931 3/323445837 1/5 35471 3/1636262 1/4 3739561 5/16365 3/6 36612471 1/2 3110155 3/4 3165 1/164587648 3/324709456 1/8 45010666 3/1649312275 1/4 411013464 9/8 4165225 1/2 4225261 MATCHED SHEETS 42 31324100 1/64106 3/164120 1/44131 BALSA STICKS 1/16 1/4 1/16 3/6 1/16 1/2 3/32 1/4 3/32 3/6 3/32 1/2 1/6 1/8 1/9 1/4 1/6 3/8 1/6 1/2 3/163/16 3/16 3/8 3/16 1/2 1/4 1/4 1/4 3/6 1/4 1/2 1/4 3/4 1/41 5/16 5/16 3/B 3/6 3/8 1/2 3/9 3/4 3161 1/2 1/2 1/2 3/4 1/21 5/6 5/8 3/4 3/4 36 48 09 10 14 10 12 16 08 11 12 18 16 11 17 22 16 13 21 34 40 21 26 27 32 42 50 52 36 46 62 56 48 67 BALSA HOT LINE Call 806 745-6394 10 am-6pm Central lime BALSA T9IANGLES36 1/41/425 3/83630 1/211234 3/43/445 1c 155 BALSA PLANKS36 1185 12150 13200 14280 11/23275 11/24360 22225 23325 24435 33495 34668 TAPERED SHEETS36 1/4265 1/4365 3/6266 3/6398 1/23120 LONE STAR EPOXY 9,Ljt695 54596 15 ,i588 30 ,/,596 36 49 49 49 56 67 76 55 115 139 220 390 76 91 190 117 136 207 262 TRAILING EDGE36 1/4132 5/161 1/439 3/61 1/246 1/2270 INSTANT GLUE 1 , Thick298 1 z TSI258 L 2 Thick550 2z TSi550 8ASSWOOO48 3/16311626 3/161430 3/163/836 3/161/246 3/163/460 1/41/442 1/43/649 1/43/460 3/63/560 3/61/270 3/53/490 1/21/290 1/23/4100 BUNDLE DEALS 201/6336685 201164361020 203/32 336645 1 53/32 55 151/8336715 101/8436675 103/16336900 103/16436610 101/4336630 101/4436694 103/8336850 53/8436625 51/2336540 51/2436855 103/32448845 51/8448485 53/16446565 51/4448625 SINE STICKS 1/61/6 1/61/4 1/63/6 3/16 3/16 3/16 3/8 3/161/2 1/4 1/4 1/43/8 1/41/2 3/8 3/6 3648 13 1623 20 1724 2332 30 2637 3042 3447 3752 SPRUCE STICKS 3648 1/6 1/615 1/8 1/41824 1/6 3/820 3/163/162534 1/4 1/43145 1/4 3/63650 3/8 3/84563 3/6 1/25570 1/2 1/26080 1/2 3/46688 SPRUCE TRIANGLE 36 3/83/845 1/21/261 3/43/477 L/TE PLY 46 1/86 1/812 150 300 HARD MAPLE 18 1/4 3/8 3/6 3/8 3/8 1/2 3/63/4 1/23/4 40 45 50 58 66 BIRCH DOWELS36 1/006 3/1611 1/414 5/1625 3/632 3 PLY 8/RCH 48 1/6412 1/3212 1/1612 1/8 12 525 425 435 450 SPLY8/RCH 46 3/3212570 1/612565 3/1612565 1/412680 GROOVED LG MOUNTS 12 ic5, 3/83/4/1/6/40 3/83/4/5/32/40 1/23/413/16/45 LONE STAR MODELS Handling Charge$300 pay UPS Add $200 COD $300 extra PP APO FPO 1623 S7th St Lubbock TX 79412 Wa,eolVisa MasteCad oeroalchecksoCOO4-1/6% lajnTeas UScrc,vnIv MiimumOrdecS10G0 WE ARE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only CUSTOM CUT CONTEST BALSA Sheets Piece ed Ciose Tolerances AAA Grade Dried ped 100% a serious modeler want performance must try 4-6 lb balsa LIGHT 46 LB 1/323 1/203 1/103 3/323 1/83 3/163 1/43 3/63 1/23 3/43 13 1/164 3/324 1/64 3/164 1/44 3/84 1/24 May 1985 45 *ark check*money order please* LARGE SASE FOR PRICE LISt IIA2YXI/7Y •BOX 1686 ER 82520 Engines/KiIsdOflk Continued page 139 dry off engine literally flood oil Carefully reinstall removed parts engine ready run Please note necessary remove piston cylinder crank bearings cases key doing damage engine course physical damage crankcase front cover crankshaft then-further disassembly will necessary should done very carefully methodicallyand possible under watchful eye engine specialist concludes series hope has helped some way lot top ics discussed emphasis primarily essentials Most topics could expanded much greater depth enough interest shown personal note course preparing series shocking realization People have hobby several decades such myself take awful lot granted dealing newcomers things second nature never realize never impart novice Perhaps anyone three decades experience should think about repaying debt owe fun have hobby would defi nitely encourage fraternity get involved growth hobby Help new people own way Give building lessons flying lessons con duct clinics seminars tech talks meet ings get involved AMA write articles like Share experience RC Scale/Wischers Continued page 45 descriptive data sheets also has reproductions drawings air craft engines shown 1934 Air Commerce Aircraft Year Book Sixty-one model drawings Paul Lindberg gas rubber-powered Popular via tion magazine listed 54 Earl Stahl Scale plans MAN Air Trails Air Age Catalog price $100 Gleason Enterprises 170429th Ave SE Rt 2 Box 125 Austin MN 55912 Detailed Scale multi-view drawings being produced documentation niodel design Curtiss Jenny JN-4 Taylor Brothers Chummy North American Mustang P-51B C drawings available three scale ratios /16 /14 % /16 ratio drawing size 24 x 36 Jenny drawing represents JN-4 flown Neta Snook used airplane flight training Amelia Earhart Taylor Chummy CG Taylors earli est design led development Cub eventually known Piper Cub its early form airplane open cockpit radial engine Photos Chummy also offered Mustang drawings four sheets made factory blueprints North American documents Aerodynamic Dimensional Data P-s 1 B/C Airplanes details prices send SASE Charles L Neely 2703 E Goshen Ave Visalia CA 93291 Fuel apparatus Providing fuel engine would appear rather simple matter Scale models completely enclosed engine fuel tank may complexities undesirable disassemble airplane fuel servicing portion cowling can made removable provided no objection non-scale lines filler tube becomes accessible full-size air plane already has hatch openings its nose can used fuel supply en trances Most aircraft have no such con venient spots hide necessary plastic tubes therefore obliged search another method airplanes having completely cowled engine run fuel fill vent tubes out bottom rear cowl area cooling air engine normally exhausted pro totype well model small bit tube can seen space isnt really non-scale because full-size planes often have tubes extending battery-box vent fuel tank overflow typical model system now has three tubes tank feed carbure tor two extending downward tank filling venting fuel being pumped model operation connect electric fuel pump lower tube pair entering tank use upper tube air vent fuel begins run vent tube signals full tank avoid spilling fuel length tube can connected vent line carry excess fuel back supply bot tle As tank nears capacity bubbles appear tube signal stopping pump return line bottle pre vents spilling raw fuel grass beneath model Fuel kills grass club field has row dead spots pit area models fueled Aimost us now using muffler pressure tank promote reliable fuel flow adds complication system tee needed vent tube connected muffler tap Unless both fill vent tubes plugged muffler pressure lost engine operating prevent loss insert machine screw 4-40 x 14 tube ends after filling Because electric fuel pump will fill tank faster rate fuel can vented through overflow tube some risk will considerable 142 Model Aviation ROADRI JNNEP 90 SPAN* 60-1 1 2 TO 14 LBS V 95 BALSAPLY---t-DIVE LG $129 ROLLED PRINTS W/MANJAL PP USA PRINTSROLLED W/MAIIJAL $2OU 1/420 X 2 NYLCN BOLTSPAN OR HEX 50-$4 50 PP USA 100-$7 00 PP USA 1/4-32 TAP gbplug PP BULK DISC DUBROROCKET CITYETC 00STENYA FIBER GLASS PUSH RODS PRECISION SAND AND SHAPE With. 4 1/2 Custom Aluminum iN i Extrusion Sanding Block TEE BAREspecially designed small sandingiobs Sander Pack contains 3 sheets assorted die-cut sandpaper Regular lengthDouble length 10 718 21 718 handy useTEE bigger L3AR4 jobs truer surfaces Regular ji Double Self Adhesive Sheet SandpaperEU Customize yourSTUFF sanding like pros 369s 11 sheets per pack 12-medium 12-fine 12-superfie per sheet U Post add 20% Catalog256 LAPPLIED DESIGN CORP 738 Penn St ElSegundo CA90245 THE JC TRAINERS Build half time Jig built balsa fuselage 90% built wing Full size plans Decal forms windshield Encellent instructions first time builder 60 Size 40 Size 20 Size Regular $8995SPECIAL $7995 Regular $7995SPECIAL $5995 Regular $5495SPECIAL $3995 Ootional Soort Wino Versions Available flow carburetor due pressure build-up full tank upright engine flooding can result sidemounted inverted engine fuel may dumped inside cowl car buretor can avoided stopping pump first bubbles appear vent tube fuel tube car buretor now full engine automatically primed ready starting Fill vent tubes must identified some way fuel never pumped muffler through tee connection tank made sheet brass tinplated steel can shaped fit size fuselage Three brass tubes soldered its forward surface fuel line fill vent advantages cus tom-made tank fill tube can bent downward its end rests tank bottom can used both filling emptying course tube must plugged immediately after filling fuel will siphon until tank empty principal reason making tank get shape will fit under cowl its being visible inside cockpit Four last six Scale models have tanks made 005-in brass assem bled soldering have shapes fit fuselage maximum capacity have V-bottoms fuel can evacuated after flying Brass erodes fuel suspected fuel remain ing brass tank could eventually cause leaks tank Emeraude now 14 years old has clunk-weighted sili cone internal tube fuel pickup tube has never changed worry times sound weight bouncing off brass walls reassuring final soldering operation assem bling tank seals tube inside perma nently now find hard believe silicone pickup tube inside fuel tank needs replaced periodically tank emptied after flying session During design stages building new model first considerations should fuel tank location tank stallation must afterthought cases has necessary build fuselage structure extension inside models engine cowl order get tank far forward possible done weight distribution avoid adding nose weight keep fuel line short rarely practicable locate tank optimum position its center 1/2 below needle valve Mounting engine angle side permits some variation needle valve location angle also deter mined some extent muffler Muffler pressure helps smooth out minor difficulties arise tank being mounted too low Viewing bottom cowl what see pair silicone tubes held place aluminum clamps wood screws Between tubes aluminum bracket miniature phone jack Radio Shack 274-253 connection starting battery glow plug Use heavy wire connectionNo 18 preferred wire starting bat tery will have miniature phone plug Radio Shack 274-286 brings ser vicing central point almost invisible yet easily accessible Scale appearance preserved Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Soaring/Pruss Continued page 47 high-strung competition ships events leave cold dont feel youre alone Moreover family commitments work schedule dont allow meet weekend crowd dont get guilt feelings spite heavy coverage column gives glamour events ships scribe tries remember still hobby Bob Johnson Wisconsin helped remind presentation Hun dred Minute Club Considering abovebut still admit ting little competitive blood veinsBob offered program satis fies yen anyone likes little challenge wishes keep sport low-key Continued page 146 May1985 143 SPECIAL THIS MONTH ONLY! 0 Ready Built 1/64 Plywood Covered Wing 60 SIZE40 SIZE SUPER LUCKYLITTLE SUPER FLYIILUCKYFLYII REG $13995 REG $11995 SPECIAL S99 95 SPECIAL 8995 60 Super Lucky Fly II 40 Little Super Lucky Fly II both superb air craft sport pattern flyers Prealigned fuselage foam wing 1164 plywood covering makes either Lucky Fly easy build easy fly