C suE rot Scale Bob & Dolly Wischer TRADE OFFS much should Scale modeler willing pay true-scale appear ance Sacrificing engine life performance gamer extra static points often considered satisfactory trade-off engine must buried nose model has no openings cooling partially understandable model have few flights contests sufficiently important modeler warrant risk permanent damage engine part win-at-all-costs technique Rather make non-scale cooling openings nose leave portions engine exposed view modeler elects take chance damaging engine particularly must flown hot weather Most probable candidates treatment have seen Precision Scale class few Sport Scale odd fact some attractive prototypes have completely cowled engines Best examples ever-popular WW II fighters liquid-cooled engines have also seen models radial-engine prototypes model engine completely concealed Spitfire flown Mike Reeves last year s World Championship specific example cooling problems home England hot weather often encountered Mike wasnt too concerned about cooling Fortunately expected heat Ottawa didnt occur cooling method proved adequate Spitfire small scoop cowl bottom carburetor air inlet prototype duct carried air forward scoop using baffles direct incoming air over engines cooling fins Mike managed get necessary three flights engine failure same system being used heat American summer would marginal cooling capacity large quantity air isnt required used concervatively allowed spill through cowl unhindered Control Line Speed fliers Pylon Racers have demonstrated use directed air cooling must kept mind speeds higher airflow greater usually have Scale Immaculate detail dummy engine nose Al Kretzs Pitcairn Mailwing wellcooled model engine mounted radials cylinders Take note scale propel ler pitot-static tube wing strut principle useful however Air taken through small opening front forced Can spot model engines carburetor peeping through ventilation slots engine shroud Marcel Jonckheeres Stearman 4EM Its indication model engine location 44 Model Aviation Flown 1OO F heat Lincoln NE Nats Steve Saugers Lockheed Orion has its model engine concealedbut well-ventilated behind dummy engine Look scale propeller ryants Bristol Bulldog has its model engine completely hidden cools successfully air entering through opening behind spinner Note bracing wires scale propeller plenty openings around dummy engine model engine Granger Williams Sea Hawk well cooled though its hidden behind highlydetailed dummycylinders Notethatthis model has flying prop flying spinner itboth well-used flow over cylinder fins head tightlyfitted baffle air exitbehind cylinder should have larger area entry prefer ably about double Airflow should dammed up behind cylinder close-fitting firewall Another modeler uncowled radial engine biplane buried engine used open front cockpit air outlet functioning system until model flown 950 temperature overheated engine ended flight prematurely knowing exact circumstances cooling duct difficult diagnose real problem example used merely idea results inadequate cooling Because excessive heat during break-in period new engine should probably flown number flights another plane before installing Scale model tight cowl minimum risk engine well model Most us make frequent visits local airports search ideas modeling subjects Whenever see plane its cowl removed open inspection opportunity examine its cooling baffle system Older planes radial engines may have small triangular baffles between pair cylinders force incoming air flow through cylinder fins rather take easy route Later planes flat four- six-cylinder engines use system baffles bring air rear cylinders keep air spilling rearward downward around outside Most well-baffled inlet pressure built up during flight cause air flowing past cooling fins accelerate beyond planes airspeed pressure cowl almost univerally used todays planes cooling air exhausts cowl outlet usually downward-formed lip cowl edge creates region low pressure promote rapid flow hot air outlet lip can seen along bottom edge lower cowl opening Its principle operation similar tothatofawingwhere airpressureis reducedby accelerating air deflecting case downward rather upward wing has advantage being propeller slipstream feature equally effective models evacuation heat cowL similar arrangement found row Continued page 118 July 1981 45 MIKE Ijeeves tabulous Spittire circuitous cooling duct Hiding beneath spinner ot David Vaughans P-1 mall vent model engine tiny opening cowl bottomthe prototypes cooling model Small openings rightif lead carburetor air inlet Flights hot weather would ruin engine efficient ductwork Can really model Incredible finish MIDWEST PRODUCTS COMPANY INC 4005 IndIana St Hobart IndIana 46342 219942-1134 Send $100 catalog THE RICK STICK SUPREME SPORT TRAINER FULLY AEROBATIC RICKS R/C MODELS IN 81 irs INTRODUCING THE WEEKENDER FLITE BOX SIZE 124 x 12% x 18 PLYWOOD SANDED READY FOR PRIMER SEALER HARDWARE AND 15 DRAWER CABINET INCLUDED 95 25 40 95 Pro-Cut Kt Hardware Landing Gear Full Length Wood md Pre-Built Ready Fine Sand & Cover Full Length Balsa Wood & Spruce Spars Hinged Surfaces Hardware Halico Gear Nylon Bolts Tapped Bolt Gear & Wing SPACE FOR 15 Drawer Cabinet 1-Gal Fuel Battery Fuel Pump Power Panel Prop Bin Tool Tray Electric Starter Cleaner Towels No Other Like addition AMA Safety Code proposed item concerns flying high ways whether near flying fieldsor crosscountry flights As stadium flying re quirements proposal considers condi dons provide safe operation Two factors primarily involved minimum altitude crossing over highways other concerns flying off side highways rather over expect also AMAs new Safety Advisory Committee will involved review ing making recommendations Execu tive Council concerning proposal Before leave month cant resist commenting Pauls remark .. done good job covering some minor problems safety cut fingers etc. According mail finger lacerations far frequent injuries sustained modelers Whirling propellers cause injuries no way can think ot make apropellerthatwill its job cut things like fingers inserted its arc its extreme case cut finger becomes amputation doubt nine-fingered modelers believe minor problem John Preston 7012 Elvira Ct Falls Church VA 22042 RC Aerobatics/Van Putte Continued page 43 Orlando last Tangerine contest often make jokes about some older Pattern pilots Don claims flying better ever reason former Pattern greats over hill because lose competitive drive skills Don still has both Don practices doing whole pattern flight time does maneuver once brand new him really blows flight hell go back try better Practice important him claims having skilled observer watch flights critique carries equal importance told fellow Master class fliers help other great deal telling pilot exactly what airplane doing times pilot cannot tell wings level vertical observer can can judges Don tries practice together another pilot can take turns criticizing other says easy develop bad habit performing particular maneuver realizing has also found simple acquire feeling smug satisfaction maneuver realizing has some basic faults like non-round loops etc Now Ive got get Don practice hes down Guess will get good Out deal Ron Van Putte 111 Sleepy Oaks Rd Fort Walton Beach FL 32548 RC Scale/Wischers Continued page 45 flaps around periphery cowls used large radial engines maximum cooling model engine should kept open takeoff position full-scale practice closed progressively maintain desired cylinder head temperatures model engine cooling flaps could remain open entire flight although full-scale use closed until after landing maintain optimum head temperatures during reduced-power landing approach opened taxiing scale modeling small concession make interest engine preservation Engine cooling problems Scale models seem us constantly contest Scale rally has its share planes balky engines prone quit inopportune moments Scale modelers good fortune glow engines forgiving because nature sometimes get away things could devasting An engine will run spite being tortured heat overly-lean needle valve setting Too lean setting causes overheat ing itself combined tight cowl can shorten flight steal bit engines expected life Repetition leads calam ity Good engine men among modelers often found CL Speed RC Pylon events fellows really know treat engine starting break-in using proper glow plug best cooling methods important cor rect fuel needle settings Scale modelers tend use standard fuels plugs often reluc tant change needle valve seeting required change weather humidity altitude have seen number Scale models no convenient means changing needle setting disastrous condition really pays check setting manually pointing nose upward few seconds before takeoff make certain engine will starve climbing flying away home field contest rally altitude humidity may affect engine performance mixture control needs accessible means hole cowl adjustment Finally AMA rule book under Unified Continued page 122 118 Model Aviation Send SASE Free Brochure 0 Dealer Inquiries Invited 0 Florida Residents Add 4% Sales Tax ccKoRhta3ooHandmg RICKS RIC MODELS INC & Slapping 1730 DREW ST CLEARWATER FL 33515 INDIAN CITY RAWIO CONTROL CLUB PRESENTS GREATER MICHIGAN MODELERS SHOW & EXPO ill PLANES SCARS MANIJFACTURERSSTATIC DISPLAYS SIINP SHOP October 234 1981 West Eight Mile Artillery Armory Oak 1ark Michigan GIANT SCALE II GEAR ER SCALE 3P00 BY POPULAR OBMANO SPANDAU & VICKERS PLASTIC GUN KITS STANDARD PILOT COMPLETE WITH GOGGLES GNOME ROTARY ENGINE CYLINDERS VINTAGE GOLDEN AGE & BALLOON TIES WHTELS Send $1 for Illustrated Catalog WILLIAMS BROTH ERSlnc tNItuw Dept MA 181 Pawnee Street Marcas Calif92069 $4250 Kit $5000 Assem Lu Northeast Engineering PO Box 6201M Bridgeport Ct 06606 aoesn t quite 01W lilaIwlIl fliS J / cu engine veIops almost 4 hp yet weighs pound over Quadra has power pull Byron Pitts straight upwithout prop reduction also takes no space Quadrait will fit entirely inside cowl Nosen D unexposed stripped chain-saw motor engine manufactured USA miniature aircraft use Comes complete ready run year 100% warranty NOW YOU GET CHOICE BASE 37 ENGINE Ready-to-run excludes features below can purchased separately Machined Balenced Flywheel$1000 Ball Bearing Front Housing$2000 Exhaust Manifold$750 Six-Bolt Hub$1400 Engine Mount$1200 COMPLETE MODIFIED 37 ENGINE Factory Bench-tested includes following HI-CARBON FORGEDONEpIECE CRANK AND CONNECTING ROD ELECTRONIC IGNITION SIX-BOLT HUB ANE POSITIONABLE EXHAUSi MANIFOLD BALL-BEARING ON CRANK Both Run ias Oil Comolete Parts & Service Send check M 0 O 0 UPS Add $400 shipping & Scale Judging states specifically model engine need completely concealed part engine can exposed non-scale open ings can made engine cooling Balancing wings Does model try turn speed changes Does loop end up helix Are aileron rudder transmiter trim controls constant need adjustment good chance common faults result wing panel being heavier other Checking balance edge beneath wing center will tell panel needs have some weight added Usually need discovered after wing finished addition weight tip going mar perfect scale finish An ounce two extra weight things Scale models can possible build wing balanced 122 Model Aviation Route 2 Box 9 300 Dtx1 Ifwst Beacher IL 60401 312 9462$t5 beginning likely wing need attention having balsa-sheeted cover over either foam balsa structure Open-frame work wings tend lighter less need balancing use small sensitive balance scale weigh sheet balsa average five-to sixfoot wing will require about dozen sheets 1/16-in 3/32-in balsa forthe cover sheets sorted two stacks six mixed give equal weight panel easy misled appearance smooth white sheet expect lightest turns out heavy Checking thickness micrometer may reveal reason sheets same thickness thicker sheets used same wing panel imbalance will probably result difference thickness can nuisance edge-gluing sheets before applying foam framework use fast-drying model cement joining edges pressing sheets down flat surface Pins inserted through joints flat angle whole sheet set end dry Scrape off excess cement top side shows uneven joints due unequal thickness becomes inner surface attaching foam structure speckled C-grain sheets should used along wing leading edge curvature greatest wing tips solid block balance can affected wrong choice balsa balance wing narrow edge determine whether two halves equal weight before applying tips last opportunity make compensations two tip blocks equal weight after carving outer surface can hollowed less other used lighter wing Right left tips can also made different weights wood As last resort piece metal such machine screw some lead shot can epoxied hollowed tip Now have carefully balanced wing its bare wood state application finish must watched closely preserve equal weight distribution especially true finishing polyester resin fiberglass cloth An extra coat resin panel could add ounces because unlike dope no loss due evaporation Adding small quantity extra resin near tip can method balancing adds something structural strength whereas metal weight dead load Dont try adding resin over dope will cure Bob Dolly Wiseher Rt 1 S-221 Lapham Peak Road Delaflela WI 53018 RC Soaring/Pruss Continued page 47 Next year cabin fever gets February 1 hold off couple weeks head Detroit Rumor has although contests tougher winters getting milder Soarcraft name out past has popped onto soaring scene again Ken Wardrip new owner interested Scale will find Glasfiugel 604 Diamant Libelle lineup have glass fuselages builtup wings tail Magnum 12 148-in Unlimited class bird also being revived too has all-glass fuselage built-up tail wing literature prices write Ken Ward rip/Soarcraft 25 I-D F Hacienda Ave. Camp bell CA 95008 Airtronics now know Lee Renaud has Airtronics full swing again much sought-after Sagitta sailplane kit available Also available hard find parts earlier planes such Aquila Lee says contact him directly canopies tow hooks wing wires other kit parts Write Lee Renaud/Airtronics 12160 Woodruff Ave Downey CA 90241 Archacopteryx No thats third line old eye-testing chart Jim Ealys company Jim specializes Scale threeviews plans some kits catalog lists sailplanes 920s up present list includes sailplanes no fewer 1 8 countries Most plans 1/5-scale blue line usually two sheets Kits include old primary glider SG-38 Grunau Baby II Monarch C Tandem Tutor catalog also includes other hardware non-scale kits Write Jim Ealy/Archaeopteryx Continued page 126 WL1 makers WPOPular PLUGDRIVER Fast & easy starting Lights J.glow plugs _______ adj twin plugs Bright plugs 12v battery sags 7voltsl No dropping resistors PHONE 203-333-1717
Edition: Model Aviation - 1981/07
Page Numbers: 44, 45, 118, 122
C suE rot Scale Bob & Dolly Wischer TRADE OFFS much should Scale modeler willing pay true-scale appear ance Sacrificing engine life performance gamer extra static points often considered satisfactory trade-off engine must buried nose model has no openings cooling partially understandable model have few flights contests sufficiently important modeler warrant risk permanent damage engine part win-at-all-costs technique Rather make non-scale cooling openings nose leave portions engine exposed view modeler elects take chance damaging engine particularly must flown hot weather Most probable candidates treatment have seen Precision Scale class few Sport Scale odd fact some attractive prototypes have completely cowled engines Best examples ever-popular WW II fighters liquid-cooled engines have also seen models radial-engine prototypes model engine completely concealed Spitfire flown Mike Reeves last year s World Championship specific example cooling problems home England hot weather often encountered Mike wasnt too concerned about cooling Fortunately expected heat Ottawa didnt occur cooling method proved adequate Spitfire small scoop cowl bottom carburetor air inlet prototype duct carried air forward scoop using baffles direct incoming air over engines cooling fins Mike managed get necessary three flights engine failure same system being used heat American summer would marginal cooling capacity large quantity air isnt required used concervatively allowed spill through cowl unhindered Control Line Speed fliers Pylon Racers have demonstrated use directed air cooling must kept mind speeds higher airflow greater usually have Scale Immaculate detail dummy engine nose Al Kretzs Pitcairn Mailwing wellcooled model engine mounted radials cylinders Take note scale propel ler pitot-static tube wing strut principle useful however Air taken through small opening front forced Can spot model engines carburetor peeping through ventilation slots engine shroud Marcel Jonckheeres Stearman 4EM Its indication model engine location 44 Model Aviation Flown 1OO F heat Lincoln NE Nats Steve Saugers Lockheed Orion has its model engine concealedbut well-ventilated behind dummy engine Look scale propeller ryants Bristol Bulldog has its model engine completely hidden cools successfully air entering through opening behind spinner Note bracing wires scale propeller plenty openings around dummy engine model engine Granger Williams Sea Hawk well cooled though its hidden behind highlydetailed dummycylinders Notethatthis model has flying prop flying spinner itboth well-used flow over cylinder fins head tightlyfitted baffle air exitbehind cylinder should have larger area entry prefer ably about double Airflow should dammed up behind cylinder close-fitting firewall Another modeler uncowled radial engine biplane buried engine used open front cockpit air outlet functioning system until model flown 950 temperature overheated engine ended flight prematurely knowing exact circumstances cooling duct difficult diagnose real problem example used merely idea results inadequate cooling Because excessive heat during break-in period new engine should probably flown number flights another plane before installing Scale model tight cowl minimum risk engine well model Most us make frequent visits local airports search ideas modeling subjects Whenever see plane its cowl removed open inspection opportunity examine its cooling baffle system Older planes radial engines may have small triangular baffles between pair cylinders force incoming air flow through cylinder fins rather take easy route Later planes flat four- six-cylinder engines use system baffles bring air rear cylinders keep air spilling rearward downward around outside Most well-baffled inlet pressure built up during flight cause air flowing past cooling fins accelerate beyond planes airspeed pressure cowl almost univerally used todays planes cooling air exhausts cowl outlet usually downward-formed lip cowl edge creates region low pressure promote rapid flow hot air outlet lip can seen along bottom edge lower cowl opening Its principle operation similar tothatofawingwhere airpressureis reducedby accelerating air deflecting case downward rather upward wing has advantage being propeller slipstream feature equally effective models evacuation heat cowL similar arrangement found row Continued page 118 July 1981 45 MIKE Ijeeves tabulous Spittire circuitous cooling duct Hiding beneath spinner ot David Vaughans P-1 mall vent model engine tiny opening cowl bottomthe prototypes cooling model Small openings rightif lead carburetor air inlet Flights hot weather would ruin engine efficient ductwork Can really model Incredible finish MIDWEST PRODUCTS COMPANY INC 4005 IndIana St Hobart IndIana 46342 219942-1134 Send $100 catalog THE RICK STICK SUPREME SPORT TRAINER FULLY AEROBATIC RICKS R/C MODELS IN 81 irs INTRODUCING THE WEEKENDER FLITE BOX SIZE 124 x 12% x 18 PLYWOOD SANDED READY FOR PRIMER SEALER HARDWARE AND 15 DRAWER CABINET INCLUDED 95 25 40 95 Pro-Cut Kt Hardware Landing Gear Full Length Wood md Pre-Built Ready Fine Sand & Cover Full Length Balsa Wood & Spruce Spars Hinged Surfaces Hardware Halico Gear Nylon Bolts Tapped Bolt Gear & Wing SPACE FOR 15 Drawer Cabinet 1-Gal Fuel Battery Fuel Pump Power Panel Prop Bin Tool Tray Electric Starter Cleaner Towels No Other Like addition AMA Safety Code proposed item concerns flying high ways whether near flying fieldsor crosscountry flights As stadium flying re quirements proposal considers condi dons provide safe operation Two factors primarily involved minimum altitude crossing over highways other concerns flying off side highways rather over expect also AMAs new Safety Advisory Committee will involved review ing making recommendations Execu tive Council concerning proposal Before leave month cant resist commenting Pauls remark .. done good job covering some minor problems safety cut fingers etc. According mail finger lacerations far frequent injuries sustained modelers Whirling propellers cause injuries no way can think ot make apropellerthatwill its job cut things like fingers inserted its arc its extreme case cut finger becomes amputation doubt nine-fingered modelers believe minor problem John Preston 7012 Elvira Ct Falls Church VA 22042 RC Aerobatics/Van Putte Continued page 43 Orlando last Tangerine contest often make jokes about some older Pattern pilots Don claims flying better ever reason former Pattern greats over hill because lose competitive drive skills Don still has both Don practices doing whole pattern flight time does maneuver once brand new him really blows flight hell go back try better Practice important him claims having skilled observer watch flights critique carries equal importance told fellow Master class fliers help other great deal telling pilot exactly what airplane doing times pilot cannot tell wings level vertical observer can can judges Don tries practice together another pilot can take turns criticizing other says easy develop bad habit performing particular maneuver realizing has also found simple acquire feeling smug satisfaction maneuver realizing has some basic faults like non-round loops etc Now Ive got get Don practice hes down Guess will get good Out deal Ron Van Putte 111 Sleepy Oaks Rd Fort Walton Beach FL 32548 RC Scale/Wischers Continued page 45 flaps around periphery cowls used large radial engines maximum cooling model engine should kept open takeoff position full-scale practice closed progressively maintain desired cylinder head temperatures model engine cooling flaps could remain open entire flight although full-scale use closed until after landing maintain optimum head temperatures during reduced-power landing approach opened taxiing scale modeling small concession make interest engine preservation Engine cooling problems Scale models seem us constantly contest Scale rally has its share planes balky engines prone quit inopportune moments Scale modelers good fortune glow engines forgiving because nature sometimes get away things could devasting An engine will run spite being tortured heat overly-lean needle valve setting Too lean setting causes overheat ing itself combined tight cowl can shorten flight steal bit engines expected life Repetition leads calam ity Good engine men among modelers often found CL Speed RC Pylon events fellows really know treat engine starting break-in using proper glow plug best cooling methods important cor rect fuel needle settings Scale modelers tend use standard fuels plugs often reluc tant change needle valve seeting required change weather humidity altitude have seen number Scale models no convenient means changing needle setting disastrous condition really pays check setting manually pointing nose upward few seconds before takeoff make certain engine will starve climbing flying away home field contest rally altitude humidity may affect engine performance mixture control needs accessible means hole cowl adjustment Finally AMA rule book under Unified Continued page 122 118 Model Aviation Send SASE Free Brochure 0 Dealer Inquiries Invited 0 Florida Residents Add 4% Sales Tax ccKoRhta3ooHandmg RICKS RIC MODELS INC & Slapping 1730 DREW ST CLEARWATER FL 33515 INDIAN CITY RAWIO CONTROL CLUB PRESENTS GREATER MICHIGAN MODELERS SHOW & EXPO ill PLANES SCARS MANIJFACTURERSSTATIC DISPLAYS SIINP SHOP October 234 1981 West Eight Mile Artillery Armory Oak 1ark Michigan GIANT SCALE II GEAR ER SCALE 3P00 BY POPULAR OBMANO SPANDAU & VICKERS PLASTIC GUN KITS STANDARD PILOT COMPLETE WITH GOGGLES GNOME ROTARY ENGINE CYLINDERS VINTAGE GOLDEN AGE & BALLOON TIES WHTELS Send $1 for Illustrated Catalog WILLIAMS BROTH ERSlnc tNItuw Dept MA 181 Pawnee Street Marcas Calif92069 $4250 Kit $5000 Assem Lu Northeast Engineering PO Box 6201M Bridgeport Ct 06606 aoesn t quite 01W lilaIwlIl fliS J / cu engine veIops almost 4 hp yet weighs pound over Quadra has power pull Byron Pitts straight upwithout prop reduction also takes no space Quadrait will fit entirely inside cowl Nosen D unexposed stripped chain-saw motor engine manufactured USA miniature aircraft use Comes complete ready run year 100% warranty NOW YOU GET CHOICE BASE 37 ENGINE Ready-to-run excludes features below can purchased separately Machined Balenced Flywheel$1000 Ball Bearing Front Housing$2000 Exhaust Manifold$750 Six-Bolt Hub$1400 Engine Mount$1200 COMPLETE MODIFIED 37 ENGINE Factory Bench-tested includes following HI-CARBON FORGEDONEpIECE CRANK AND CONNECTING ROD ELECTRONIC IGNITION SIX-BOLT HUB ANE POSITIONABLE EXHAUSi MANIFOLD BALL-BEARING ON CRANK Both Run ias Oil Comolete Parts & Service Send check M 0 O 0 UPS Add $400 shipping & Scale Judging states specifically model engine need completely concealed part engine can exposed non-scale open ings can made engine cooling Balancing wings Does model try turn speed changes Does loop end up helix Are aileron rudder transmiter trim controls constant need adjustment good chance common faults result wing panel being heavier other Checking balance edge beneath wing center will tell panel needs have some weight added Usually need discovered after wing finished addition weight tip going mar perfect scale finish An ounce two extra weight things Scale models can possible build wing balanced 122 Model Aviation Route 2 Box 9 300 Dtx1 Ifwst Beacher IL 60401 312 9462$t5 beginning likely wing need attention having balsa-sheeted cover over either foam balsa structure Open-frame work wings tend lighter less need balancing use small sensitive balance scale weigh sheet balsa average five-to sixfoot wing will require about dozen sheets 1/16-in 3/32-in balsa forthe cover sheets sorted two stacks six mixed give equal weight panel easy misled appearance smooth white sheet expect lightest turns out heavy Checking thickness micrometer may reveal reason sheets same thickness thicker sheets used same wing panel imbalance will probably result difference thickness can nuisance edge-gluing sheets before applying foam framework use fast-drying model cement joining edges pressing sheets down flat surface Pins inserted through joints flat angle whole sheet set end dry Scrape off excess cement top side shows uneven joints due unequal thickness becomes inner surface attaching foam structure speckled C-grain sheets should used along wing leading edge curvature greatest wing tips solid block balance can affected wrong choice balsa balance wing narrow edge determine whether two halves equal weight before applying tips last opportunity make compensations two tip blocks equal weight after carving outer surface can hollowed less other used lighter wing Right left tips can also made different weights wood As last resort piece metal such machine screw some lead shot can epoxied hollowed tip Now have carefully balanced wing its bare wood state application finish must watched closely preserve equal weight distribution especially true finishing polyester resin fiberglass cloth An extra coat resin panel could add ounces because unlike dope no loss due evaporation Adding small quantity extra resin near tip can method balancing adds something structural strength whereas metal weight dead load Dont try adding resin over dope will cure Bob Dolly Wiseher Rt 1 S-221 Lapham Peak Road Delaflela WI 53018 RC Soaring/Pruss Continued page 47 Next year cabin fever gets February 1 hold off couple weeks head Detroit Rumor has although contests tougher winters getting milder Soarcraft name out past has popped onto soaring scene again Ken Wardrip new owner interested Scale will find Glasfiugel 604 Diamant Libelle lineup have glass fuselages builtup wings tail Magnum 12 148-in Unlimited class bird also being revived too has all-glass fuselage built-up tail wing literature prices write Ken Ward rip/Soarcraft 25 I-D F Hacienda Ave. Camp bell CA 95008 Airtronics now know Lee Renaud has Airtronics full swing again much sought-after Sagitta sailplane kit available Also available hard find parts earlier planes such Aquila Lee says contact him directly canopies tow hooks wing wires other kit parts Write Lee Renaud/Airtronics 12160 Woodruff Ave Downey CA 90241 Archacopteryx No thats third line old eye-testing chart Jim Ealys company Jim specializes Scale threeviews plans some kits catalog lists sailplanes 920s up present list includes sailplanes no fewer 1 8 countries Most plans 1/5-scale blue line usually two sheets Kits include old primary glider SG-38 Grunau Baby II Monarch C Tandem Tutor catalog also includes other hardware non-scale kits Write Jim Ealy/Archaeopteryx Continued page 126 WL1 makers WPOPular PLUGDRIVER Fast & easy starting Lights J.glow plugs _______ adj twin plugs Bright plugs 12v battery sags 7voltsl No dropping resistors PHONE 203-333-1717
Edition: Model Aviation - 1981/07
Page Numbers: 44, 45, 118, 122
C suE rot Scale Bob & Dolly Wischer TRADE OFFS much should Scale modeler willing pay true-scale appear ance Sacrificing engine life performance gamer extra static points often considered satisfactory trade-off engine must buried nose model has no openings cooling partially understandable model have few flights contests sufficiently important modeler warrant risk permanent damage engine part win-at-all-costs technique Rather make non-scale cooling openings nose leave portions engine exposed view modeler elects take chance damaging engine particularly must flown hot weather Most probable candidates treatment have seen Precision Scale class few Sport Scale odd fact some attractive prototypes have completely cowled engines Best examples ever-popular WW II fighters liquid-cooled engines have also seen models radial-engine prototypes model engine completely concealed Spitfire flown Mike Reeves last year s World Championship specific example cooling problems home England hot weather often encountered Mike wasnt too concerned about cooling Fortunately expected heat Ottawa didnt occur cooling method proved adequate Spitfire small scoop cowl bottom carburetor air inlet prototype duct carried air forward scoop using baffles direct incoming air over engines cooling fins Mike managed get necessary three flights engine failure same system being used heat American summer would marginal cooling capacity large quantity air isnt required used concervatively allowed spill through cowl unhindered Control Line Speed fliers Pylon Racers have demonstrated use directed air cooling must kept mind speeds higher airflow greater usually have Scale Immaculate detail dummy engine nose Al Kretzs Pitcairn Mailwing wellcooled model engine mounted radials cylinders Take note scale propel ler pitot-static tube wing strut principle useful however Air taken through small opening front forced Can spot model engines carburetor peeping through ventilation slots engine shroud Marcel Jonckheeres Stearman 4EM Its indication model engine location 44 Model Aviation Flown 1OO F heat Lincoln NE Nats Steve Saugers Lockheed Orion has its model engine concealedbut well-ventilated behind dummy engine Look scale propeller ryants Bristol Bulldog has its model engine completely hidden cools successfully air entering through opening behind spinner Note bracing wires scale propeller plenty openings around dummy engine model engine Granger Williams Sea Hawk well cooled though its hidden behind highlydetailed dummycylinders Notethatthis model has flying prop flying spinner itboth well-used flow over cylinder fins head tightlyfitted baffle air exitbehind cylinder should have larger area entry prefer ably about double Airflow should dammed up behind cylinder close-fitting firewall Another modeler uncowled radial engine biplane buried engine used open front cockpit air outlet functioning system until model flown 950 temperature overheated engine ended flight prematurely knowing exact circumstances cooling duct difficult diagnose real problem example used merely idea results inadequate cooling Because excessive heat during break-in period new engine should probably flown number flights another plane before installing Scale model tight cowl minimum risk engine well model Most us make frequent visits local airports search ideas modeling subjects Whenever see plane its cowl removed open inspection opportunity examine its cooling baffle system Older planes radial engines may have small triangular baffles between pair cylinders force incoming air flow through cylinder fins rather take easy route Later planes flat four- six-cylinder engines use system baffles bring air rear cylinders keep air spilling rearward downward around outside Most well-baffled inlet pressure built up during flight cause air flowing past cooling fins accelerate beyond planes airspeed pressure cowl almost univerally used todays planes cooling air exhausts cowl outlet usually downward-formed lip cowl edge creates region low pressure promote rapid flow hot air outlet lip can seen along bottom edge lower cowl opening Its principle operation similar tothatofawingwhere airpressureis reducedby accelerating air deflecting case downward rather upward wing has advantage being propeller slipstream feature equally effective models evacuation heat cowL similar arrangement found row Continued page 118 July 1981 45 MIKE Ijeeves tabulous Spittire circuitous cooling duct Hiding beneath spinner ot David Vaughans P-1 mall vent model engine tiny opening cowl bottomthe prototypes cooling model Small openings rightif lead carburetor air inlet Flights hot weather would ruin engine efficient ductwork Can really model Incredible finish MIDWEST PRODUCTS COMPANY INC 4005 IndIana St Hobart IndIana 46342 219942-1134 Send $100 catalog THE RICK STICK SUPREME SPORT TRAINER FULLY AEROBATIC RICKS R/C MODELS IN 81 irs INTRODUCING THE WEEKENDER FLITE BOX SIZE 124 x 12% x 18 PLYWOOD SANDED READY FOR PRIMER SEALER HARDWARE AND 15 DRAWER CABINET INCLUDED 95 25 40 95 Pro-Cut Kt Hardware Landing Gear Full Length Wood md Pre-Built Ready Fine Sand & Cover Full Length Balsa Wood & Spruce Spars Hinged Surfaces Hardware Halico Gear Nylon Bolts Tapped Bolt Gear & Wing SPACE FOR 15 Drawer Cabinet 1-Gal Fuel Battery Fuel Pump Power Panel Prop Bin Tool Tray Electric Starter Cleaner Towels No Other Like addition AMA Safety Code proposed item concerns flying high ways whether near flying fieldsor crosscountry flights As stadium flying re quirements proposal considers condi dons provide safe operation Two factors primarily involved minimum altitude crossing over highways other concerns flying off side highways rather over expect also AMAs new Safety Advisory Committee will involved review ing making recommendations Execu tive Council concerning proposal Before leave month cant resist commenting Pauls remark .. done good job covering some minor problems safety cut fingers etc. According mail finger lacerations far frequent injuries sustained modelers Whirling propellers cause injuries no way can think ot make apropellerthatwill its job cut things like fingers inserted its arc its extreme case cut finger becomes amputation doubt nine-fingered modelers believe minor problem John Preston 7012 Elvira Ct Falls Church VA 22042 RC Aerobatics/Van Putte Continued page 43 Orlando last Tangerine contest often make jokes about some older Pattern pilots Don claims flying better ever reason former Pattern greats over hill because lose competitive drive skills Don still has both Don practices doing whole pattern flight time does maneuver once brand new him really blows flight hell go back try better Practice important him claims having skilled observer watch flights critique carries equal importance told fellow Master class fliers help other great deal telling pilot exactly what airplane doing times pilot cannot tell wings level vertical observer can can judges Don tries practice together another pilot can take turns criticizing other says easy develop bad habit performing particular maneuver realizing has also found simple acquire feeling smug satisfaction maneuver realizing has some basic faults like non-round loops etc Now Ive got get Don practice hes down Guess will get good Out deal Ron Van Putte 111 Sleepy Oaks Rd Fort Walton Beach FL 32548 RC Scale/Wischers Continued page 45 flaps around periphery cowls used large radial engines maximum cooling model engine should kept open takeoff position full-scale practice closed progressively maintain desired cylinder head temperatures model engine cooling flaps could remain open entire flight although full-scale use closed until after landing maintain optimum head temperatures during reduced-power landing approach opened taxiing scale modeling small concession make interest engine preservation Engine cooling problems Scale models seem us constantly contest Scale rally has its share planes balky engines prone quit inopportune moments Scale modelers good fortune glow engines forgiving because nature sometimes get away things could devasting An engine will run spite being tortured heat overly-lean needle valve setting Too lean setting causes overheat ing itself combined tight cowl can shorten flight steal bit engines expected life Repetition leads calam ity Good engine men among modelers often found CL Speed RC Pylon events fellows really know treat engine starting break-in using proper glow plug best cooling methods important cor rect fuel needle settings Scale modelers tend use standard fuels plugs often reluc tant change needle valve seeting required change weather humidity altitude have seen number Scale models no convenient means changing needle setting disastrous condition really pays check setting manually pointing nose upward few seconds before takeoff make certain engine will starve climbing flying away home field contest rally altitude humidity may affect engine performance mixture control needs accessible means hole cowl adjustment Finally AMA rule book under Unified Continued page 122 118 Model Aviation Send SASE Free Brochure 0 Dealer Inquiries Invited 0 Florida Residents Add 4% Sales Tax ccKoRhta3ooHandmg RICKS RIC MODELS INC & Slapping 1730 DREW ST CLEARWATER FL 33515 INDIAN CITY RAWIO CONTROL CLUB PRESENTS GREATER MICHIGAN MODELERS SHOW & EXPO ill PLANES SCARS MANIJFACTURERSSTATIC DISPLAYS SIINP SHOP October 234 1981 West Eight Mile Artillery Armory Oak 1ark Michigan GIANT SCALE II GEAR ER SCALE 3P00 BY POPULAR OBMANO SPANDAU & VICKERS PLASTIC GUN KITS STANDARD PILOT COMPLETE WITH GOGGLES GNOME ROTARY ENGINE CYLINDERS VINTAGE GOLDEN AGE & BALLOON TIES WHTELS Send $1 for Illustrated Catalog WILLIAMS BROTH ERSlnc tNItuw Dept MA 181 Pawnee Street Marcas Calif92069 $4250 Kit $5000 Assem Lu Northeast Engineering PO Box 6201M Bridgeport Ct 06606 aoesn t quite 01W lilaIwlIl fliS J / cu engine veIops almost 4 hp yet weighs pound over Quadra has power pull Byron Pitts straight upwithout prop reduction also takes no space Quadrait will fit entirely inside cowl Nosen D unexposed stripped chain-saw motor engine manufactured USA miniature aircraft use Comes complete ready run year 100% warranty NOW YOU GET CHOICE BASE 37 ENGINE Ready-to-run excludes features below can purchased separately Machined Balenced Flywheel$1000 Ball Bearing Front Housing$2000 Exhaust Manifold$750 Six-Bolt Hub$1400 Engine Mount$1200 COMPLETE MODIFIED 37 ENGINE Factory Bench-tested includes following HI-CARBON FORGEDONEpIECE CRANK AND CONNECTING ROD ELECTRONIC IGNITION SIX-BOLT HUB ANE POSITIONABLE EXHAUSi MANIFOLD BALL-BEARING ON CRANK Both Run ias Oil Comolete Parts & Service Send check M 0 O 0 UPS Add $400 shipping & Scale Judging states specifically model engine need completely concealed part engine can exposed non-scale open ings can made engine cooling Balancing wings Does model try turn speed changes Does loop end up helix Are aileron rudder transmiter trim controls constant need adjustment good chance common faults result wing panel being heavier other Checking balance edge beneath wing center will tell panel needs have some weight added Usually need discovered after wing finished addition weight tip going mar perfect scale finish An ounce two extra weight things Scale models can possible build wing balanced 122 Model Aviation Route 2 Box 9 300 Dtx1 Ifwst Beacher IL 60401 312 9462$t5 beginning likely wing need attention having balsa-sheeted cover over either foam balsa structure Open-frame work wings tend lighter less need balancing use small sensitive balance scale weigh sheet balsa average five-to sixfoot wing will require about dozen sheets 1/16-in 3/32-in balsa forthe cover sheets sorted two stacks six mixed give equal weight panel easy misled appearance smooth white sheet expect lightest turns out heavy Checking thickness micrometer may reveal reason sheets same thickness thicker sheets used same wing panel imbalance will probably result difference thickness can nuisance edge-gluing sheets before applying foam framework use fast-drying model cement joining edges pressing sheets down flat surface Pins inserted through joints flat angle whole sheet set end dry Scrape off excess cement top side shows uneven joints due unequal thickness becomes inner surface attaching foam structure speckled C-grain sheets should used along wing leading edge curvature greatest wing tips solid block balance can affected wrong choice balsa balance wing narrow edge determine whether two halves equal weight before applying tips last opportunity make compensations two tip blocks equal weight after carving outer surface can hollowed less other used lighter wing Right left tips can also made different weights wood As last resort piece metal such machine screw some lead shot can epoxied hollowed tip Now have carefully balanced wing its bare wood state application finish must watched closely preserve equal weight distribution especially true finishing polyester resin fiberglass cloth An extra coat resin panel could add ounces because unlike dope no loss due evaporation Adding small quantity extra resin near tip can method balancing adds something structural strength whereas metal weight dead load Dont try adding resin over dope will cure Bob Dolly Wiseher Rt 1 S-221 Lapham Peak Road Delaflela WI 53018 RC Soaring/Pruss Continued page 47 Next year cabin fever gets February 1 hold off couple weeks head Detroit Rumor has although contests tougher winters getting milder Soarcraft name out past has popped onto soaring scene again Ken Wardrip new owner interested Scale will find Glasfiugel 604 Diamant Libelle lineup have glass fuselages builtup wings tail Magnum 12 148-in Unlimited class bird also being revived too has all-glass fuselage built-up tail wing literature prices write Ken Ward rip/Soarcraft 25 I-D F Hacienda Ave. Camp bell CA 95008 Airtronics now know Lee Renaud has Airtronics full swing again much sought-after Sagitta sailplane kit available Also available hard find parts earlier planes such Aquila Lee says contact him directly canopies tow hooks wing wires other kit parts Write Lee Renaud/Airtronics 12160 Woodruff Ave Downey CA 90241 Archacopteryx No thats third line old eye-testing chart Jim Ealys company Jim specializes Scale threeviews plans some kits catalog lists sailplanes 920s up present list includes sailplanes no fewer 1 8 countries Most plans 1/5-scale blue line usually two sheets Kits include old primary glider SG-38 Grunau Baby II Monarch C Tandem Tutor catalog also includes other hardware non-scale kits Write Jim Ealy/Archaeopteryx Continued page 126 WL1 makers WPOPular PLUGDRIVER Fast & easy starting Lights J.glow plugs _______ adj twin plugs Bright plugs 12v battery sags 7voltsl No dropping resistors PHONE 203-333-1717
Edition: Model Aviation - 1981/07
Page Numbers: 44, 45, 118, 122
C suE rot Scale Bob & Dolly Wischer TRADE OFFS much should Scale modeler willing pay true-scale appear ance Sacrificing engine life performance gamer extra static points often considered satisfactory trade-off engine must buried nose model has no openings cooling partially understandable model have few flights contests sufficiently important modeler warrant risk permanent damage engine part win-at-all-costs technique Rather make non-scale cooling openings nose leave portions engine exposed view modeler elects take chance damaging engine particularly must flown hot weather Most probable candidates treatment have seen Precision Scale class few Sport Scale odd fact some attractive prototypes have completely cowled engines Best examples ever-popular WW II fighters liquid-cooled engines have also seen models radial-engine prototypes model engine completely concealed Spitfire flown Mike Reeves last year s World Championship specific example cooling problems home England hot weather often encountered Mike wasnt too concerned about cooling Fortunately expected heat Ottawa didnt occur cooling method proved adequate Spitfire small scoop cowl bottom carburetor air inlet prototype duct carried air forward scoop using baffles direct incoming air over engines cooling fins Mike managed get necessary three flights engine failure same system being used heat American summer would marginal cooling capacity large quantity air isnt required used concervatively allowed spill through cowl unhindered Control Line Speed fliers Pylon Racers have demonstrated use directed air cooling must kept mind speeds higher airflow greater usually have Scale Immaculate detail dummy engine nose Al Kretzs Pitcairn Mailwing wellcooled model engine mounted radials cylinders Take note scale propel ler pitot-static tube wing strut principle useful however Air taken through small opening front forced Can spot model engines carburetor peeping through ventilation slots engine shroud Marcel Jonckheeres Stearman 4EM Its indication model engine location 44 Model Aviation Flown 1OO F heat Lincoln NE Nats Steve Saugers Lockheed Orion has its model engine concealedbut well-ventilated behind dummy engine Look scale propeller ryants Bristol Bulldog has its model engine completely hidden cools successfully air entering through opening behind spinner Note bracing wires scale propeller plenty openings around dummy engine model engine Granger Williams Sea Hawk well cooled though its hidden behind highlydetailed dummycylinders Notethatthis model has flying prop flying spinner itboth well-used flow over cylinder fins head tightlyfitted baffle air exitbehind cylinder should have larger area entry prefer ably about double Airflow should dammed up behind cylinder close-fitting firewall Another modeler uncowled radial engine biplane buried engine used open front cockpit air outlet functioning system until model flown 950 temperature overheated engine ended flight prematurely knowing exact circumstances cooling duct difficult diagnose real problem example used merely idea results inadequate cooling Because excessive heat during break-in period new engine should probably flown number flights another plane before installing Scale model tight cowl minimum risk engine well model Most us make frequent visits local airports search ideas modeling subjects Whenever see plane its cowl removed open inspection opportunity examine its cooling baffle system Older planes radial engines may have small triangular baffles between pair cylinders force incoming air flow through cylinder fins rather take easy route Later planes flat four- six-cylinder engines use system baffles bring air rear cylinders keep air spilling rearward downward around outside Most well-baffled inlet pressure built up during flight cause air flowing past cooling fins accelerate beyond planes airspeed pressure cowl almost univerally used todays planes cooling air exhausts cowl outlet usually downward-formed lip cowl edge creates region low pressure promote rapid flow hot air outlet lip can seen along bottom edge lower cowl opening Its principle operation similar tothatofawingwhere airpressureis reducedby accelerating air deflecting case downward rather upward wing has advantage being propeller slipstream feature equally effective models evacuation heat cowL similar arrangement found row Continued page 118 July 1981 45 MIKE Ijeeves tabulous Spittire circuitous cooling duct Hiding beneath spinner ot David Vaughans P-1 mall vent model engine tiny opening cowl bottomthe prototypes cooling model Small openings rightif lead carburetor air inlet Flights hot weather would ruin engine efficient ductwork Can really model Incredible finish MIDWEST PRODUCTS COMPANY INC 4005 IndIana St Hobart IndIana 46342 219942-1134 Send $100 catalog THE RICK STICK SUPREME SPORT TRAINER FULLY AEROBATIC RICKS R/C MODELS IN 81 irs INTRODUCING THE WEEKENDER FLITE BOX SIZE 124 x 12% x 18 PLYWOOD SANDED READY FOR PRIMER SEALER HARDWARE AND 15 DRAWER CABINET INCLUDED 95 25 40 95 Pro-Cut Kt Hardware Landing Gear Full Length Wood md Pre-Built Ready Fine Sand & Cover Full Length Balsa Wood & Spruce Spars Hinged Surfaces Hardware Halico Gear Nylon Bolts Tapped Bolt Gear & Wing SPACE FOR 15 Drawer Cabinet 1-Gal Fuel Battery Fuel Pump Power Panel Prop Bin Tool Tray Electric Starter Cleaner Towels No Other Like addition AMA Safety Code proposed item concerns flying high ways whether near flying fieldsor crosscountry flights As stadium flying re quirements proposal considers condi dons provide safe operation Two factors primarily involved minimum altitude crossing over highways other concerns flying off side highways rather over expect also AMAs new Safety Advisory Committee will involved review ing making recommendations Execu tive Council concerning proposal Before leave month cant resist commenting Pauls remark .. done good job covering some minor problems safety cut fingers etc. According mail finger lacerations far frequent injuries sustained modelers Whirling propellers cause injuries no way can think ot make apropellerthatwill its job cut things like fingers inserted its arc its extreme case cut finger becomes amputation doubt nine-fingered modelers believe minor problem John Preston 7012 Elvira Ct Falls Church VA 22042 RC Aerobatics/Van Putte Continued page 43 Orlando last Tangerine contest often make jokes about some older Pattern pilots Don claims flying better ever reason former Pattern greats over hill because lose competitive drive skills Don still has both Don practices doing whole pattern flight time does maneuver once brand new him really blows flight hell go back try better Practice important him claims having skilled observer watch flights critique carries equal importance told fellow Master class fliers help other great deal telling pilot exactly what airplane doing times pilot cannot tell wings level vertical observer can can judges Don tries practice together another pilot can take turns criticizing other says easy develop bad habit performing particular maneuver realizing has also found simple acquire feeling smug satisfaction maneuver realizing has some basic faults like non-round loops etc Now Ive got get Don practice hes down Guess will get good Out deal Ron Van Putte 111 Sleepy Oaks Rd Fort Walton Beach FL 32548 RC Scale/Wischers Continued page 45 flaps around periphery cowls used large radial engines maximum cooling model engine should kept open takeoff position full-scale practice closed progressively maintain desired cylinder head temperatures model engine cooling flaps could remain open entire flight although full-scale use closed until after landing maintain optimum head temperatures during reduced-power landing approach opened taxiing scale modeling small concession make interest engine preservation Engine cooling problems Scale models seem us constantly contest Scale rally has its share planes balky engines prone quit inopportune moments Scale modelers good fortune glow engines forgiving because nature sometimes get away things could devasting An engine will run spite being tortured heat overly-lean needle valve setting Too lean setting causes overheat ing itself combined tight cowl can shorten flight steal bit engines expected life Repetition leads calam ity Good engine men among modelers often found CL Speed RC Pylon events fellows really know treat engine starting break-in using proper glow plug best cooling methods important cor rect fuel needle settings Scale modelers tend use standard fuels plugs often reluc tant change needle valve seeting required change weather humidity altitude have seen number Scale models no convenient means changing needle setting disastrous condition really pays check setting manually pointing nose upward few seconds before takeoff make certain engine will starve climbing flying away home field contest rally altitude humidity may affect engine performance mixture control needs accessible means hole cowl adjustment Finally AMA rule book under Unified Continued page 122 118 Model Aviation Send SASE Free Brochure 0 Dealer Inquiries Invited 0 Florida Residents Add 4% Sales Tax ccKoRhta3ooHandmg RICKS RIC MODELS INC & Slapping 1730 DREW ST CLEARWATER FL 33515 INDIAN CITY RAWIO CONTROL CLUB PRESENTS GREATER MICHIGAN MODELERS SHOW & EXPO ill PLANES SCARS MANIJFACTURERSSTATIC DISPLAYS SIINP SHOP October 234 1981 West Eight Mile Artillery Armory Oak 1ark Michigan GIANT SCALE II GEAR ER SCALE 3P00 BY POPULAR OBMANO SPANDAU & VICKERS PLASTIC GUN KITS STANDARD PILOT COMPLETE WITH GOGGLES GNOME ROTARY ENGINE CYLINDERS VINTAGE GOLDEN AGE & BALLOON TIES WHTELS Send $1 for Illustrated Catalog WILLIAMS BROTH ERSlnc tNItuw Dept MA 181 Pawnee Street Marcas Calif92069 $4250 Kit $5000 Assem Lu Northeast Engineering PO Box 6201M Bridgeport Ct 06606 aoesn t quite 01W lilaIwlIl fliS J / cu engine veIops almost 4 hp yet weighs pound over Quadra has power pull Byron Pitts straight upwithout prop reduction also takes no space Quadrait will fit entirely inside cowl Nosen D unexposed stripped chain-saw motor engine manufactured USA miniature aircraft use Comes complete ready run year 100% warranty NOW YOU GET CHOICE BASE 37 ENGINE Ready-to-run excludes features below can purchased separately Machined Balenced Flywheel$1000 Ball Bearing Front Housing$2000 Exhaust Manifold$750 Six-Bolt Hub$1400 Engine Mount$1200 COMPLETE MODIFIED 37 ENGINE Factory Bench-tested includes following HI-CARBON FORGEDONEpIECE CRANK AND CONNECTING ROD ELECTRONIC IGNITION SIX-BOLT HUB ANE POSITIONABLE EXHAUSi MANIFOLD BALL-BEARING ON CRANK Both Run ias Oil Comolete Parts & Service Send check M 0 O 0 UPS Add $400 shipping & Scale Judging states specifically model engine need completely concealed part engine can exposed non-scale open ings can made engine cooling Balancing wings Does model try turn speed changes Does loop end up helix Are aileron rudder transmiter trim controls constant need adjustment good chance common faults result wing panel being heavier other Checking balance edge beneath wing center will tell panel needs have some weight added Usually need discovered after wing finished addition weight tip going mar perfect scale finish An ounce two extra weight things Scale models can possible build wing balanced 122 Model Aviation Route 2 Box 9 300 Dtx1 Ifwst Beacher IL 60401 312 9462$t5 beginning likely wing need attention having balsa-sheeted cover over either foam balsa structure Open-frame work wings tend lighter less need balancing use small sensitive balance scale weigh sheet balsa average five-to sixfoot wing will require about dozen sheets 1/16-in 3/32-in balsa forthe cover sheets sorted two stacks six mixed give equal weight panel easy misled appearance smooth white sheet expect lightest turns out heavy Checking thickness micrometer may reveal reason sheets same thickness thicker sheets used same wing panel imbalance will probably result difference thickness can nuisance edge-gluing sheets before applying foam framework use fast-drying model cement joining edges pressing sheets down flat surface Pins inserted through joints flat angle whole sheet set end dry Scrape off excess cement top side shows uneven joints due unequal thickness becomes inner surface attaching foam structure speckled C-grain sheets should used along wing leading edge curvature greatest wing tips solid block balance can affected wrong choice balsa balance wing narrow edge determine whether two halves equal weight before applying tips last opportunity make compensations two tip blocks equal weight after carving outer surface can hollowed less other used lighter wing Right left tips can also made different weights wood As last resort piece metal such machine screw some lead shot can epoxied hollowed tip Now have carefully balanced wing its bare wood state application finish must watched closely preserve equal weight distribution especially true finishing polyester resin fiberglass cloth An extra coat resin panel could add ounces because unlike dope no loss due evaporation Adding small quantity extra resin near tip can method balancing adds something structural strength whereas metal weight dead load Dont try adding resin over dope will cure Bob Dolly Wiseher Rt 1 S-221 Lapham Peak Road Delaflela WI 53018 RC Soaring/Pruss Continued page 47 Next year cabin fever gets February 1 hold off couple weeks head Detroit Rumor has although contests tougher winters getting milder Soarcraft name out past has popped onto soaring scene again Ken Wardrip new owner interested Scale will find Glasfiugel 604 Diamant Libelle lineup have glass fuselages builtup wings tail Magnum 12 148-in Unlimited class bird also being revived too has all-glass fuselage built-up tail wing literature prices write Ken Ward rip/Soarcraft 25 I-D F Hacienda Ave. Camp bell CA 95008 Airtronics now know Lee Renaud has Airtronics full swing again much sought-after Sagitta sailplane kit available Also available hard find parts earlier planes such Aquila Lee says contact him directly canopies tow hooks wing wires other kit parts Write Lee Renaud/Airtronics 12160 Woodruff Ave Downey CA 90241 Archacopteryx No thats third line old eye-testing chart Jim Ealys company Jim specializes Scale threeviews plans some kits catalog lists sailplanes 920s up present list includes sailplanes no fewer 1 8 countries Most plans 1/5-scale blue line usually two sheets Kits include old primary glider SG-38 Grunau Baby II Monarch C Tandem Tutor catalog also includes other hardware non-scale kits Write Jim Ealy/Archaeopteryx Continued page 126 WL1 makers WPOPular PLUGDRIVER Fast & easy starting Lights J.glow plugs _______ adj twin plugs Bright plugs 12v battery sags 7voltsl No dropping resistors PHONE 203-333-1717