Speedy

U Dave Horvath aeroba tic design builds easily uses relatively inexpensive engines THIS MODEL WAS DESIGNED advanced fliers comfortable basic aerobatic maneuvers like fly fast aerobatic Club 20-type sport Pylon aircraft lessexpensive engines project took four years complete have built seven models Ive logged 400 flights Landing gear optional can installed tail-dragger configuration omitted model can hand-launched model design compromise no exception basic laws physics show time speed doubles drag squares reason left off landing gear definitely makes difference models speed maneuverability advantages include reduced drag weight building time runway independence reduced chance crosswind disasters fuel savings Since four-channel radios now come three servos hand-launched version requires three channels ailerons elevator throttle No mixing required V-tail functions elevator its connected Y pushrod simple skid makes possible land paved runway grass tail-dragger version requires four-channel control tail mixer since rudder control necessary receiver battery servos standard CONSTRUCTION step-by-step construction sequence required design elementary Make sure ail parts fit well glue joints good use Elmers Professional Carpenters Wood Glue general assembly slow-setting epoxy high-stress areas Wing The double-tapered low wing has NACA-0012 symmetrical wing section 00 incidence Dihedral 50 250 per wing panel wingspan 55 1/2 inches no washout 24 Modei Aviation ful using sandwich method cut ribs cut balsa strips least 1/2 inch longer both ends template trim ribs during assembly Make right left set ribs way edge ribs will taper outward Make sure spars straight-grain wood Lay ribs over bottom spar plan Start rib 3 Add /s shear webs top spar Make sure shear webs fit well grain vertical Join wing panels dihedral braces using slow-setting epoxy Using Dremel tool cut 3/ inch off threaded end aileron torque rods clear servos Cut ailerons medium trailing-edge stock Make sure gap between wing aileron minimal Fuselage Tape two 1/8 Lite Ply pieces together double-face tape cut out fuselage sides Sand separate two sides Glue /s-square balsa longerons fuselage assembled upside-down over plan Start formers F2 F4 using C clamps Sig canopy base sandwiched between two 1A6 balsa sheets bottom sheet crossgrained top sheet opening canopy parallel grain Sand spray paint canopy inside epoxy assembly Fit suitable plastic tube receiver antenna exits bottom-left corner fuselage Use slow-setting epoxy install firewall wing-bolt blocks servo rails V-tail Empennage Cut /2 /s strips /s balsa sheet Frame up stabilizer over plan sheet top bottom tAh balsa Fit hinge elevator After sanding everything cut assembly centerline Bevel joint epoxy two halves together 1100 Make sure halves true Alignment The engines thrustline 00 both vertically laterally Align V-tail wings Robart incidence meter 00 incidence Since fuselage tapered leading edge V-tail will sink lower trailing edge Sand September 1996 25 Despite its V-tail hand-launched version Speedy requires three channels ailerons elevator throttle Photos author Graohic Desian Carla Kunz Closeup V-tail No mixing required V-tail functions possible enginelmuffler combinations rearas elevator Its connected Y pushrod exhaust MVVS 21 GFR #3244 tuned pipe fuselage sides under tail achieve 00 incidence Make sure V-tail aligned three dimensions Carefully sand wing saddle obtain 00 reading Check wing tips incidence meter 00 incidence model covered MonoKote ailerons should have -inch throw way elevator should have 3/s-inch throw way model weighs approximately three pounds ready-tofly Engine Fuel Tank good selection two-stroke engines market design fly fleet following engine-and-prop combinations model has MVVS 21 GFR #3244 tuned pipe turning 7 x 6 APC prop another model has OS 25 SF 8 x 6 Master Airscrew Scimitar third model has OS 32 F 9 x 6 wooden Rev- ____________________________________________________ September 1996 27 Carefully bevel align halves V-tail 1100 UseWing conventional D-tube balsa plywood spruce Make slow-setting epoxy assemblysure gap between wing aileron minimal Wing conventional D-tube balsa plywood spruce Make sure gap between wing aileron minimal Canopy installation Metal weights hold everything position fuselage until slow-setting epoxy cures canopy Sig unit Its attached model piece /16 balsa sheet appropriate hole cut WY Type RC Sport Wingspan 55 1/2 inches Engine 20-35 two-stroke Functions Throttle aileron elevator hand-launched version throttle rudder aileron elevator landing-gear version Flying Weight 50 ounces approx Construction Sheet/built-up Covering MonoKote -n 0 0CD 1FJ 1/B [lIE PLY1/4 01k DOWEL0 0___ -- rC —---V --- --n ___ 0 __0 0 NO WASHOUT1/4 1 HARD BALSACUT FROM1/8 BAlSA SHEAR WEBS AILERON STOCK3/18X 3/4 ICAL GRAIN5550C G #452 3/32 STRIP AILERON HORNS1/B BAlSA SHEET1/18 BAlSA SHEET TOP B BOYrOM Is-1/S1/S HAIARAME--VTAIL0 7418- 115 1/18 PLY I 18 PLYWOOD---g, A , -- -E 1/4____DIHEDRALA1 ______- ELEVATORj BAISA T E STOCK ISOeSy TEMPLATES MOTOR MOUNTS 3/32 PLY1/81/4 BALSASPEEDY 0B 9 2026HATCH PLATE ICONTROL THROWS IAILERONS 1/4 EACH WAYTYPESPORT ENGINE2035 CU IN ELEVATOR 3/8 BACH WAY CHANNELSTHREE WING SPAN55 1/2 WING AREA451 SQ IN ___________WING LOADING16 OZ/SQ FT CONTROL HORNWEIGHT RTF50 OZ AIRFOILNACA 0012 DIHEDRAL5 Flnrnj 1996 1/8 BALSA SHEET1/8 TAIL SIOD" ADESIGNED BY Thoe HoooAh N BY Moo RooA LAMINATE1/18 PLY FOAM DING GEAR3/8AR/81/8 LIfE PLYWOODCAGED I15B/ISAI MODEL AVIATION MAGAZINE TWO 3/32BESTGREAT PLANES L1/S3/38 MUSIC 1034 LOWOODFUSELAGE SIDESTOP BOTTOM PLY1/8 UTE PLYWOODWITH 1 3/4 WLEELSLAMINATE TWO 996 RIGhTS FR5EO 817 3/I5 PlY Up another has SuperTigre G-34 wooden 9 x 6 RevUp fuel tank four-ounce Sullivan unit pressurized muffler plan shows four-ounce tank however fuselage designed accept six-ounce Sullivan tank Make sure fuel tank wrapped foam wont direct contact fuselage Flying Make sure model properly aligned warp-free balanced properly prop should horizontal piston starts bite Adjust throttle can shut engine off time Hand-launching model easy just throttle-up toss straight extra cautious first time fly model case its out trim fly until model runs out fuel land pylon style glide excellent due models low wing loading Acknowledgments Thanks friend Miro Rusnak spending countless hours computer making drawings prints help advice thanks Frank Brown Toni Stark Last least special thanks family patience support ember 1996 29 Use C-clamps during construction fuselage theyll help Fuselage assembly upside-down plan Start formers F2 maintain proper alignment sides formers F4 make sure fuselage straight formers square Dave Horvath 5151 State University Dr Las Angeles CA 90032

U Dave Horvath aeroba tic design builds easily uses relatively inexpensive engines THIS MODEL WAS DESIGNED advanced fliers comfortable basic aerobatic maneuvers like fly fast aerobatic Club 20-type sport Pylon aircraft lessexpensive engines project took four years complete have built seven models Ive logged 400 flights Landing gear optional can installed tail-dragger configuration omitted model can hand-launched model design compromise no exception basic laws physics show time speed doubles drag squares reason left off landing gear definitely makes difference models speed maneuverability advantages include reduced drag weight building time runway independence reduced chance crosswind disasters fuel savings Since four-channel radios now come three servos hand-launched version requires three channels ailerons elevator throttle No mixing required V-tail functions elevator its connected Y pushrod simple skid makes possible land paved runway grass tail-dragger version requires four-channel control tail mixer since rudder control necessary receiver battery servos standard CONSTRUCTION step-by-step construction sequence required design elementary Make sure ail parts fit well glue joints good use Elmers Professional Carpenters Wood Glue general assembly slow-setting epoxy high-stress areas Wing The double-tapered low wing has NACA-0012 symmetrical wing section 00 incidence Dihedral 50 250 per wing panel wingspan 55 1/2 inches no washout 24 Modei Aviation ful using sandwich method cut ribs cut balsa strips least 1/2 inch longer both ends template trim ribs during assembly Make right left set ribs way edge ribs will taper outward Make sure spars straight-grain wood Lay ribs over bottom spar plan Start rib 3 Add /s shear webs top spar Make sure shear webs fit well grain vertical Join wing panels dihedral braces using slow-setting epoxy Using Dremel tool cut 3/ inch off threaded end aileron torque rods clear servos Cut ailerons medium trailing-edge stock Make sure gap between wing aileron minimal Fuselage Tape two 1/8 Lite Ply pieces together double-face tape cut out fuselage sides Sand separate two sides Glue /s-square balsa longerons fuselage assembled upside-down over plan Start formers F2 F4 using C clamps Sig canopy base sandwiched between two 1A6 balsa sheets bottom sheet crossgrained top sheet opening canopy parallel grain Sand spray paint canopy inside epoxy assembly Fit suitable plastic tube receiver antenna exits bottom-left corner fuselage Use slow-setting epoxy install firewall wing-bolt blocks servo rails V-tail Empennage Cut /2 /s strips /s balsa sheet Frame up stabilizer over plan sheet top bottom tAh balsa Fit hinge elevator After sanding everything cut assembly centerline Bevel joint epoxy two halves together 1100 Make sure halves true Alignment The engines thrustline 00 both vertically laterally Align V-tail wings Robart incidence meter 00 incidence Since fuselage tapered leading edge V-tail will sink lower trailing edge Sand September 1996 25 Despite its V-tail hand-launched version Speedy requires three channels ailerons elevator throttle Photos author Graohic Desian Carla Kunz Closeup V-tail No mixing required V-tail functions possible enginelmuffler combinations rearas elevator Its connected Y pushrod exhaust MVVS 21 GFR #3244 tuned pipe fuselage sides under tail achieve 00 incidence Make sure V-tail aligned three dimensions Carefully sand wing saddle obtain 00 reading Check wing tips incidence meter 00 incidence model covered MonoKote ailerons should have -inch throw way elevator should have 3/s-inch throw way model weighs approximately three pounds ready-tofly Engine Fuel Tank good selection two-stroke engines market design fly fleet following engine-and-prop combinations model has MVVS 21 GFR #3244 tuned pipe turning 7 x 6 APC prop another model has OS 25 SF 8 x 6 Master Airscrew Scimitar third model has OS 32 F 9 x 6 wooden Rev- ____________________________________________________ September 1996 27 Carefully bevel align halves V-tail 1100 UseWing conventional D-tube balsa plywood spruce Make slow-setting epoxy assemblysure gap between wing aileron minimal Wing conventional D-tube balsa plywood spruce Make sure gap between wing aileron minimal Canopy installation Metal weights hold everything position fuselage until slow-setting epoxy cures canopy Sig unit Its attached model piece /16 balsa sheet appropriate hole cut WY Type RC Sport Wingspan 55 1/2 inches Engine 20-35 two-stroke Functions Throttle aileron elevator hand-launched version throttle rudder aileron elevator landing-gear version Flying Weight 50 ounces approx Construction Sheet/built-up Covering MonoKote -n 0 0CD 1FJ 1/B [lIE PLY1/4 01k DOWEL0 0___ -- rC —---V --- --n ___ 0 __0 0 NO WASHOUT1/4 1 HARD BALSACUT FROM1/8 BAlSA SHEAR WEBS AILERON STOCK3/18X 3/4 ICAL GRAIN5550C G #452 3/32 STRIP AILERON HORNS1/B BAlSA SHEET1/18 BAlSA SHEET TOP B BOYrOM Is-1/S1/S HAIARAME--VTAIL0 7418- 115 1/18 PLY I 18 PLYWOOD---g, A , -- -E 1/4____DIHEDRALA1 ______- ELEVATORj BAISA T E STOCK ISOeSy TEMPLATES MOTOR MOUNTS 3/32 PLY1/81/4 BALSASPEEDY 0B 9 2026HATCH PLATE ICONTROL THROWS IAILERONS 1/4 EACH WAYTYPESPORT ENGINE2035 CU IN ELEVATOR 3/8 BACH WAY CHANNELSTHREE WING SPAN55 1/2 WING AREA451 SQ IN ___________WING LOADING16 OZ/SQ FT CONTROL HORNWEIGHT RTF50 OZ AIRFOILNACA 0012 DIHEDRAL5 Flnrnj 1996 1/8 BALSA SHEET1/8 TAIL SIOD" ADESIGNED BY Thoe HoooAh N BY Moo RooA LAMINATE1/18 PLY FOAM DING GEAR3/8AR/81/8 LIfE PLYWOODCAGED I15B/ISAI MODEL AVIATION MAGAZINE TWO 3/32BESTGREAT PLANES L1/S3/38 MUSIC 1034 LOWOODFUSELAGE SIDESTOP BOTTOM PLY1/8 UTE PLYWOODWITH 1 3/4 WLEELSLAMINATE TWO 996 RIGhTS FR5EO 817 3/I5 PlY Up another has SuperTigre G-34 wooden 9 x 6 RevUp fuel tank four-ounce Sullivan unit pressurized muffler plan shows four-ounce tank however fuselage designed accept six-ounce Sullivan tank Make sure fuel tank wrapped foam wont direct contact fuselage Flying Make sure model properly aligned warp-free balanced properly prop should horizontal piston starts bite Adjust throttle can shut engine off time Hand-launching model easy just throttle-up toss straight extra cautious first time fly model case its out trim fly until model runs out fuel land pylon style glide excellent due models low wing loading Acknowledgments Thanks friend Miro Rusnak spending countless hours computer making drawings prints help advice thanks Frank Brown Toni Stark Last least special thanks family patience support ember 1996 29 Use C-clamps during construction fuselage theyll help Fuselage assembly upside-down plan Start formers F2 maintain proper alignment sides formers F4 make sure fuselage straight formers square Dave Horvath 5151 State University Dr Las Angeles CA 90032