MARA champion after year tough competition Powered K&B 15 Rev-Up 7-6 Series 400 prop Top Flite 7-6 narrow works equally well All-up weight 2-1/2 pounds nose minus 2-1/2 oz fuel Bill Fuoris Quarter Midget THE MODEL see accom panymg photos result evolu tionary process about two years began purchase House Balsa Shoestring kit finest kits ever seen quite evident great deal thought gone engine com partment design method constructing wing found instructions easy follow resulting model faster its competition Soon however others realized merits Shoe string new appearing virtu ally race realized some modifications necessary maintain edge over competi tion began experimenting air foil As kit wing approximately l/t thicker root minimum al lowable specs began streamlining wing As result several experiments came up two improvements over kit airfoil proved best shortened course currently used Cali fornia suggested modification rules other best current course short-course airfoil shown top righthand corner construction plan long-course airfoil shown profile view fuselage also experimented foam wing performed equally well built-up wing care taken keep light about construction details later next change seemed apparent slim streamline fuselage Since coupled aileron rud der see half rudder plans no longer required fuselage width capable supporting three servos across Slimming fuselage frontal area resulted 6 Model Aviation Recessing hold-down screws hatch reduces drag increases overall appearance Use liberal fillets blend cheek cowls between wing fuselage essential engine head protruding through cheek cowl prefer completely cowled engine result above changes together some construction variations dis cussed later resulted truly competi tive racer can supported fact has brought home hardware races held MARA Metropolitan Air Racing Assoc ever has assets simply raw speed Its greatest asset its ease handling stability have never found drop slightest tightest turns no opposite rudder required accomplish model may constructed scratch using built-up foam wing may constructed modifying House Balsa Shoestring Kit would suggest latter time critical factor remainder article will describe steps scratch-building model first step determine whether built up foam type wing will used Construction times will similar resulting built-up wing being couple ounces lighter equally strong Once type wing has determined fuselage construction can commence Construction FuselagePart 1 Begin fuselage construction cutting out 1/8 fuse lage sides 1/32 plywood doubler three plywood formers im portant select matched sheets sides cut out holes dou bler allow sides contour properly well keep down overall weight wing foam type diam eter front two lightening holes reduced shaded area shown plan must marked fuselage sides later removal plywood doublers epoxied sides being certain make left right side has thoroughly dried mark position formers 2 3 built-up wing used mark drill out holes fiberglass arrowshafts Glue 5/16 triangular strips top bottom side leaving cutout former 3 Install ngular stock bottom side between formers 2 2 balsa hatch supports between formers 2 3 1/16 X s/s cross brace Formers 2 3 epoxied sides sure formers square fuse lage sides After has set former triangular filler rear epoxied assembly set aside dry thoroughly Next epoxy 2 lsa block front former right-angle former right face block must line up center line former Cut out epoxy 1 diameter ply disk front block cen tered respect engine thrust-line continued page 10 September 1975 7 adequate room receiver battery switch two servos elevator coupled rudder/ aileron Throttle servo mounted tank compartment easy access Note airfoil shape filed aluminum gear struts After painting nuts holding wheel pants place moved inside pants bolt ends cutoff reduce drag Quarter-inch plywood serves rear floor tank compartment mounting platform landing gear rear holes lower hatch front holes Upper hatch provides quick easy access tank throttle servo inspection adjustments Aluminum carrying case 148 x 48 x 10 long trips date no airline has refused accept luggage will provide special handling arranged advance Basic structure lacking elevators ailerons wing tips Note large wing filletsa key factorFiberglass cowl simple construct reducing drag Fuselage rudder landing gear assembly primed painted wings andsubject melting cracking vacuumstab covered Solarfilm MonoKoteformed plastic cowls Bill Fuoris Quarter Midget has dried mark location left cheek cowl rough shape block being careful touch marked cowl area bottom block must cut form straight line lower edges fuselage sides inside block now may hol lowed out allow particular engine mount r nose block now glued k laminated ks tack-glued top fuselage former aft Another such block permanently glued top fuselage front former Sand blocks close possible final shape Now mark position fuselage sides formers rear top block inside fuselage Cut block razor saw separate tank com partment hatch top deck Remove blocks hollow out per plans 1/64 ply edge protector now glued rear hatch front deck blocks now set aside until after wing has constructed Foam Wing foam-wing version follows standard construction techniques Cutouts should made plywood dihedral braces prior covering wing panel covered 1/16 sheet fitted leading-edge trailingedge tip blocks sure groove TE root accept 1/16 ply fillet support area marked out earlier fuse lage sides now removed Two pieces removed wing center section allow wing sit snugly area just removed fuselage sides Al low room stub ribs wing root Install stub ribs two ply braces installed wings joined Fiberglass should used reinforce center section wing glued fuselage Built-Up-Wing wing ribs first must cut out easily accomplished cutting out plywood aluminum root tip templates holes arrow shafts Eighteen X 9 balsa rib blanks cut out ofa piece 3/32 sheet two s drilled arrowshafts Nine blanks sand wiched between ply aluminum tem plates held place two-in -28 bolts nuts Care must taken ensure alignment tip root templates shown side view fuselage blanks block sanded no lumps gulleys between cor responding points root tip templates ribs separated beveled top bottom edges ribs squared off ribs can copied individually entire process repeated other wing panel modifing House Balsa Shoestring kit same procedure can used reshape kit ribs fuselage rib locations marked arrowshafts fuselage placed inverted flat surface former protruding over edge arrowshafts slid through holes sides ribs placed respective positions arrowshafts arrowshafts supported tip l placed parallel tip rib shafts should rest unrestrained dowels root rib panel glued fuselage side arrowshaft careful place glue fillet around shaft ipside fuselage has dried epoxy rib its marked position arrowshafts Install 1/16 X 5/16 hard balsa basswood strip leading edge 3/16 X a strip trailing edge panel Check see strips straight root tip no bows leading-edge strip should flush ribs whereas trailing-edge strip should extend above below ribs remainder wing construction straight forward Care should taken sanding wing total area shown extremely close minimum specifications 300 sq FuselagePart 2 top hatch now taped guarantee correct alignment top deck rear top deck 3/16 bottom sheeting glued fuselage ply landing gear plat form hatch supports epoxied bottom hatch cut a sheet /8 dowel pin installed top hatch ls inset hatch drilled out hold-down screws screw heads should re cessed lower hatch screwed lower half fuselage may sanded shape cowl blocks cut shape hollowed Before glueing left cheek cowl make certain et tube channel air carb has installed lines up hollowed left cheek cowl Before attaching right cowl balsa block carved shape placed glued between former 1/16 plywood spinner ring right cheek cowl glued fuse lage block except area back former 1 dry cowl cut off razor saw inch back front former balsa plug removed used make plaster mold fiberglass engine cowl Tail Undercarriage tail parts cut 3/16 balsa sheet /8 groove cut outside edges surfaces razor saw Strips 1/64 continued page 73 10 Model Aviation Bill Fuoris Quarter Midget continued page 10 X ply glued groove pro tect edges surfaces surfaces can sanded shape shown plans elevators lower portion rudder cut off hinged rudder stab epoxied fuselage canopy added making certain minimum fuselage height S maintained Fillets stalled wing tail canopy cowls using microballoons wheel pants now constructed entire airplane final sanded suggested aluminum landing gear struts filed airfoil shape particu larly leading edge fuselage rudder wheel pants should now given coat resin coat epoxy filler sanding after fuse lage given light coat epoxy paint wing stab should covered Monokote Solar Film Equipment I have found coupled aileron rudder works fine problems Therefore necessary have two servos within fuselage aileron/rudder elevator engine servo mounted tank compartment right side fuselage proper balance receiver battery pack should mounted against former 2 tank four oz Sullivan slant type Flying The airplane will prove responsive stable adhere CG location control surface deflec tions indicated plan find set up will turn dime slightest snap roll tendency tight est turns will cause no structural damage all-up weight model does exceed 3 pounds However plane weighs would suggest whip smoothly gently turn pylon five ships Ive built still existence ranged weight 40 oz 42 oz Well guess thats about rest up engine radio FF Indoor continued page 21 cial everyone agrees much pitch too much important thing have enough pitch Luckily fairly easy determine prop pitch too low particular model Simply measure rpm just after model stops climbing As general rule properly adjusted microfilm model heavy should have cruise rpm tween 45 55 Lighter models will should have lower range rpm Measure RPM Indoor props except PennyPlane Easy B usually turn slower han 80 rpm some go low 35 rpm rhat can see prop turning common method measuring rpm time long takes prop make 10 revolu tions 9egin count 0 start watch count next time same blade comes up count other blade continue 10 Count 10 just blade passes start position 10th time Divide time seconds 600 get rpm example 8 seconds 10 revs 600/8 75 rpm Thats too high Strive 12 seconds 48 rpm 15 seconds 40 rpm Sad True reporter has never able understand indoor activity around country comes halt sum mer During warm weather models fly bet ter rubber works better rubber output proportional temperature always easier handle fragile models warm hands Nonetheless Miami Fla modelers fly indoor blimp hangers Lakehurst NJ have summer activity Miami fliers have about 10 months activity year hangars have good conditions during summer address P0 Box 545 Richardson Texas 75080 September1975 73 EOW*15005U15I5 p.idI July 1975 Dear Fellow Model Nuilders hope building leaet thoce beautiful sew Kite Flying Fortress Kingfish Gavela Prineiro now available tobby Shop way. 1/2 Nylon Anoennorien also releaaed new Kits havent seen sure oheok dealer Theyre great gain 575 end will good job Knerythiog in psohage Nylon Motor Mouot control Morn Mell Crank Nuts & Molts easy installation told about new s/C Stinson Reliant 40 engines last letter Digineering Depart ment going full speed ahead projent deliver Kits sometime Fell Im sure saw writeup Goosriator N/C Modeler know youll enjoy building flying one. want take opportunity eotend ny ninoere thanks eath emery helping make doys brighter during pant several weeks have hoes sonvelesoing surgery thoughtful reaseheronoen nnd good wishes will long remembered Weve enjoyed letters appretiete suggestions. Keop cOming 3620 G StreetPhiladelphia Pennsylvania 19134USA produotrevinswnrnd urtrao imwnnductaoieworoduttreoisw Sanding Blocks Ideal sanding large areas such wings stabs fuselages etc new sanding blocks have high-quality 3M open coat sandpaper bonded high-density foam block Available three grits size 9 x 3-3/4 89 cents Prather Products 1660 Ravenna Ave. Wilming ton Ca 90744 Tricks tradethe bent fuselage design Stan Chilton gives model high thrust line prodwctaoiewprodwcOeoiewPodwctrCoiCWPrOdwCtrCoiCW otherwise normal layout Other structural details show up clearly
Edition: Model Aviation - 1975/09
Page Numbers: 6, 7, 10, 73
MARA champion after year tough competition Powered K&B 15 Rev-Up 7-6 Series 400 prop Top Flite 7-6 narrow works equally well All-up weight 2-1/2 pounds nose minus 2-1/2 oz fuel Bill Fuoris Quarter Midget THE MODEL see accom panymg photos result evolu tionary process about two years began purchase House Balsa Shoestring kit finest kits ever seen quite evident great deal thought gone engine com partment design method constructing wing found instructions easy follow resulting model faster its competition Soon however others realized merits Shoe string new appearing virtu ally race realized some modifications necessary maintain edge over competi tion began experimenting air foil As kit wing approximately l/t thicker root minimum al lowable specs began streamlining wing As result several experiments came up two improvements over kit airfoil proved best shortened course currently used Cali fornia suggested modification rules other best current course short-course airfoil shown top righthand corner construction plan long-course airfoil shown profile view fuselage also experimented foam wing performed equally well built-up wing care taken keep light about construction details later next change seemed apparent slim streamline fuselage Since coupled aileron rud der see half rudder plans no longer required fuselage width capable supporting three servos across Slimming fuselage frontal area resulted 6 Model Aviation Recessing hold-down screws hatch reduces drag increases overall appearance Use liberal fillets blend cheek cowls between wing fuselage essential engine head protruding through cheek cowl prefer completely cowled engine result above changes together some construction variations dis cussed later resulted truly competi tive racer can supported fact has brought home hardware races held MARA Metropolitan Air Racing Assoc ever has assets simply raw speed Its greatest asset its ease handling stability have never found drop slightest tightest turns no opposite rudder required accomplish model may constructed scratch using built-up foam wing may constructed modifying House Balsa Shoestring Kit would suggest latter time critical factor remainder article will describe steps scratch-building model first step determine whether built up foam type wing will used Construction times will similar resulting built-up wing being couple ounces lighter equally strong Once type wing has determined fuselage construction can commence Construction FuselagePart 1 Begin fuselage construction cutting out 1/8 fuse lage sides 1/32 plywood doubler three plywood formers im portant select matched sheets sides cut out holes dou bler allow sides contour properly well keep down overall weight wing foam type diam eter front two lightening holes reduced shaded area shown plan must marked fuselage sides later removal plywood doublers epoxied sides being certain make left right side has thoroughly dried mark position formers 2 3 built-up wing used mark drill out holes fiberglass arrowshafts Glue 5/16 triangular strips top bottom side leaving cutout former 3 Install ngular stock bottom side between formers 2 2 balsa hatch supports between formers 2 3 1/16 X s/s cross brace Formers 2 3 epoxied sides sure formers square fuse lage sides After has set former triangular filler rear epoxied assembly set aside dry thoroughly Next epoxy 2 lsa block front former right-angle former right face block must line up center line former Cut out epoxy 1 diameter ply disk front block cen tered respect engine thrust-line continued page 10 September 1975 7 adequate room receiver battery switch two servos elevator coupled rudder/ aileron Throttle servo mounted tank compartment easy access Note airfoil shape filed aluminum gear struts After painting nuts holding wheel pants place moved inside pants bolt ends cutoff reduce drag Quarter-inch plywood serves rear floor tank compartment mounting platform landing gear rear holes lower hatch front holes Upper hatch provides quick easy access tank throttle servo inspection adjustments Aluminum carrying case 148 x 48 x 10 long trips date no airline has refused accept luggage will provide special handling arranged advance Basic structure lacking elevators ailerons wing tips Note large wing filletsa key factorFiberglass cowl simple construct reducing drag Fuselage rudder landing gear assembly primed painted wings andsubject melting cracking vacuumstab covered Solarfilm MonoKoteformed plastic cowls Bill Fuoris Quarter Midget has dried mark location left cheek cowl rough shape block being careful touch marked cowl area bottom block must cut form straight line lower edges fuselage sides inside block now may hol lowed out allow particular engine mount r nose block now glued k laminated ks tack-glued top fuselage former aft Another such block permanently glued top fuselage front former Sand blocks close possible final shape Now mark position fuselage sides formers rear top block inside fuselage Cut block razor saw separate tank com partment hatch top deck Remove blocks hollow out per plans 1/64 ply edge protector now glued rear hatch front deck blocks now set aside until after wing has constructed Foam Wing foam-wing version follows standard construction techniques Cutouts should made plywood dihedral braces prior covering wing panel covered 1/16 sheet fitted leading-edge trailingedge tip blocks sure groove TE root accept 1/16 ply fillet support area marked out earlier fuse lage sides now removed Two pieces removed wing center section allow wing sit snugly area just removed fuselage sides Al low room stub ribs wing root Install stub ribs two ply braces installed wings joined Fiberglass should used reinforce center section wing glued fuselage Built-Up-Wing wing ribs first must cut out easily accomplished cutting out plywood aluminum root tip templates holes arrow shafts Eighteen X 9 balsa rib blanks cut out ofa piece 3/32 sheet two s drilled arrowshafts Nine blanks sand wiched between ply aluminum tem plates held place two-in -28 bolts nuts Care must taken ensure alignment tip root templates shown side view fuselage blanks block sanded no lumps gulleys between cor responding points root tip templates ribs separated beveled top bottom edges ribs squared off ribs can copied individually entire process repeated other wing panel modifing House Balsa Shoestring kit same procedure can used reshape kit ribs fuselage rib locations marked arrowshafts fuselage placed inverted flat surface former protruding over edge arrowshafts slid through holes sides ribs placed respective positions arrowshafts arrowshafts supported tip l placed parallel tip rib shafts should rest unrestrained dowels root rib panel glued fuselage side arrowshaft careful place glue fillet around shaft ipside fuselage has dried epoxy rib its marked position arrowshafts Install 1/16 X 5/16 hard balsa basswood strip leading edge 3/16 X a strip trailing edge panel Check see strips straight root tip no bows leading-edge strip should flush ribs whereas trailing-edge strip should extend above below ribs remainder wing construction straight forward Care should taken sanding wing total area shown extremely close minimum specifications 300 sq FuselagePart 2 top hatch now taped guarantee correct alignment top deck rear top deck 3/16 bottom sheeting glued fuselage ply landing gear plat form hatch supports epoxied bottom hatch cut a sheet /8 dowel pin installed top hatch ls inset hatch drilled out hold-down screws screw heads should re cessed lower hatch screwed lower half fuselage may sanded shape cowl blocks cut shape hollowed Before glueing left cheek cowl make certain et tube channel air carb has installed lines up hollowed left cheek cowl Before attaching right cowl balsa block carved shape placed glued between former 1/16 plywood spinner ring right cheek cowl glued fuse lage block except area back former 1 dry cowl cut off razor saw inch back front former balsa plug removed used make plaster mold fiberglass engine cowl Tail Undercarriage tail parts cut 3/16 balsa sheet /8 groove cut outside edges surfaces razor saw Strips 1/64 continued page 73 10 Model Aviation Bill Fuoris Quarter Midget continued page 10 X ply glued groove pro tect edges surfaces surfaces can sanded shape shown plans elevators lower portion rudder cut off hinged rudder stab epoxied fuselage canopy added making certain minimum fuselage height S maintained Fillets stalled wing tail canopy cowls using microballoons wheel pants now constructed entire airplane final sanded suggested aluminum landing gear struts filed airfoil shape particu larly leading edge fuselage rudder wheel pants should now given coat resin coat epoxy filler sanding after fuse lage given light coat epoxy paint wing stab should covered Monokote Solar Film Equipment I have found coupled aileron rudder works fine problems Therefore necessary have two servos within fuselage aileron/rudder elevator engine servo mounted tank compartment right side fuselage proper balance receiver battery pack should mounted against former 2 tank four oz Sullivan slant type Flying The airplane will prove responsive stable adhere CG location control surface deflec tions indicated plan find set up will turn dime slightest snap roll tendency tight est turns will cause no structural damage all-up weight model does exceed 3 pounds However plane weighs would suggest whip smoothly gently turn pylon five ships Ive built still existence ranged weight 40 oz 42 oz Well guess thats about rest up engine radio FF Indoor continued page 21 cial everyone agrees much pitch too much important thing have enough pitch Luckily fairly easy determine prop pitch too low particular model Simply measure rpm just after model stops climbing As general rule properly adjusted microfilm model heavy should have cruise rpm tween 45 55 Lighter models will should have lower range rpm Measure RPM Indoor props except PennyPlane Easy B usually turn slower han 80 rpm some go low 35 rpm rhat can see prop turning common method measuring rpm time long takes prop make 10 revolu tions 9egin count 0 start watch count next time same blade comes up count other blade continue 10 Count 10 just blade passes start position 10th time Divide time seconds 600 get rpm example 8 seconds 10 revs 600/8 75 rpm Thats too high Strive 12 seconds 48 rpm 15 seconds 40 rpm Sad True reporter has never able understand indoor activity around country comes halt sum mer During warm weather models fly bet ter rubber works better rubber output proportional temperature always easier handle fragile models warm hands Nonetheless Miami Fla modelers fly indoor blimp hangers Lakehurst NJ have summer activity Miami fliers have about 10 months activity year hangars have good conditions during summer address P0 Box 545 Richardson Texas 75080 September1975 73 EOW*15005U15I5 p.idI July 1975 Dear Fellow Model Nuilders hope building leaet thoce beautiful sew Kite Flying Fortress Kingfish Gavela Prineiro now available tobby Shop way. 1/2 Nylon Anoennorien also releaaed new Kits havent seen sure oheok dealer Theyre great gain 575 end will good job Knerythiog in psohage Nylon Motor Mouot control Morn Mell Crank Nuts & Molts easy installation told about new s/C Stinson Reliant 40 engines last letter Digineering Depart ment going full speed ahead projent deliver Kits sometime Fell Im sure saw writeup Goosriator N/C Modeler know youll enjoy building flying one. want take opportunity eotend ny ninoere thanks eath emery helping make doys brighter during pant several weeks have hoes sonvelesoing surgery thoughtful reaseheronoen nnd good wishes will long remembered Weve enjoyed letters appretiete suggestions. Keop cOming 3620 G StreetPhiladelphia Pennsylvania 19134USA produotrevinswnrnd urtrao imwnnductaoieworoduttreoisw Sanding Blocks Ideal sanding large areas such wings stabs fuselages etc new sanding blocks have high-quality 3M open coat sandpaper bonded high-density foam block Available three grits size 9 x 3-3/4 89 cents Prather Products 1660 Ravenna Ave. Wilming ton Ca 90744 Tricks tradethe bent fuselage design Stan Chilton gives model high thrust line prodwctaoiewprodwcOeoiewPodwctrCoiCWPrOdwCtrCoiCW otherwise normal layout Other structural details show up clearly
Edition: Model Aviation - 1975/09
Page Numbers: 6, 7, 10, 73
MARA champion after year tough competition Powered K&B 15 Rev-Up 7-6 Series 400 prop Top Flite 7-6 narrow works equally well All-up weight 2-1/2 pounds nose minus 2-1/2 oz fuel Bill Fuoris Quarter Midget THE MODEL see accom panymg photos result evolu tionary process about two years began purchase House Balsa Shoestring kit finest kits ever seen quite evident great deal thought gone engine com partment design method constructing wing found instructions easy follow resulting model faster its competition Soon however others realized merits Shoe string new appearing virtu ally race realized some modifications necessary maintain edge over competi tion began experimenting air foil As kit wing approximately l/t thicker root minimum al lowable specs began streamlining wing As result several experiments came up two improvements over kit airfoil proved best shortened course currently used Cali fornia suggested modification rules other best current course short-course airfoil shown top righthand corner construction plan long-course airfoil shown profile view fuselage also experimented foam wing performed equally well built-up wing care taken keep light about construction details later next change seemed apparent slim streamline fuselage Since coupled aileron rud der see half rudder plans no longer required fuselage width capable supporting three servos across Slimming fuselage frontal area resulted 6 Model Aviation Recessing hold-down screws hatch reduces drag increases overall appearance Use liberal fillets blend cheek cowls between wing fuselage essential engine head protruding through cheek cowl prefer completely cowled engine result above changes together some construction variations dis cussed later resulted truly competi tive racer can supported fact has brought home hardware races held MARA Metropolitan Air Racing Assoc ever has assets simply raw speed Its greatest asset its ease handling stability have never found drop slightest tightest turns no opposite rudder required accomplish model may constructed scratch using built-up foam wing may constructed modifying House Balsa Shoestring Kit would suggest latter time critical factor remainder article will describe steps scratch-building model first step determine whether built up foam type wing will used Construction times will similar resulting built-up wing being couple ounces lighter equally strong Once type wing has determined fuselage construction can commence Construction FuselagePart 1 Begin fuselage construction cutting out 1/8 fuse lage sides 1/32 plywood doubler three plywood formers im portant select matched sheets sides cut out holes dou bler allow sides contour properly well keep down overall weight wing foam type diam eter front two lightening holes reduced shaded area shown plan must marked fuselage sides later removal plywood doublers epoxied sides being certain make left right side has thoroughly dried mark position formers 2 3 built-up wing used mark drill out holes fiberglass arrowshafts Glue 5/16 triangular strips top bottom side leaving cutout former 3 Install ngular stock bottom side between formers 2 2 balsa hatch supports between formers 2 3 1/16 X s/s cross brace Formers 2 3 epoxied sides sure formers square fuse lage sides After has set former triangular filler rear epoxied assembly set aside dry thoroughly Next epoxy 2 lsa block front former right-angle former right face block must line up center line former Cut out epoxy 1 diameter ply disk front block cen tered respect engine thrust-line continued page 10 September 1975 7 adequate room receiver battery switch two servos elevator coupled rudder/ aileron Throttle servo mounted tank compartment easy access Note airfoil shape filed aluminum gear struts After painting nuts holding wheel pants place moved inside pants bolt ends cutoff reduce drag Quarter-inch plywood serves rear floor tank compartment mounting platform landing gear rear holes lower hatch front holes Upper hatch provides quick easy access tank throttle servo inspection adjustments Aluminum carrying case 148 x 48 x 10 long trips date no airline has refused accept luggage will provide special handling arranged advance Basic structure lacking elevators ailerons wing tips Note large wing filletsa key factorFiberglass cowl simple construct reducing drag Fuselage rudder landing gear assembly primed painted wings andsubject melting cracking vacuumstab covered Solarfilm MonoKoteformed plastic cowls Bill Fuoris Quarter Midget has dried mark location left cheek cowl rough shape block being careful touch marked cowl area bottom block must cut form straight line lower edges fuselage sides inside block now may hol lowed out allow particular engine mount r nose block now glued k laminated ks tack-glued top fuselage former aft Another such block permanently glued top fuselage front former Sand blocks close possible final shape Now mark position fuselage sides formers rear top block inside fuselage Cut block razor saw separate tank com partment hatch top deck Remove blocks hollow out per plans 1/64 ply edge protector now glued rear hatch front deck blocks now set aside until after wing has constructed Foam Wing foam-wing version follows standard construction techniques Cutouts should made plywood dihedral braces prior covering wing panel covered 1/16 sheet fitted leading-edge trailingedge tip blocks sure groove TE root accept 1/16 ply fillet support area marked out earlier fuse lage sides now removed Two pieces removed wing center section allow wing sit snugly area just removed fuselage sides Al low room stub ribs wing root Install stub ribs two ply braces installed wings joined Fiberglass should used reinforce center section wing glued fuselage Built-Up-Wing wing ribs first must cut out easily accomplished cutting out plywood aluminum root tip templates holes arrow shafts Eighteen X 9 balsa rib blanks cut out ofa piece 3/32 sheet two s drilled arrowshafts Nine blanks sand wiched between ply aluminum tem plates held place two-in -28 bolts nuts Care must taken ensure alignment tip root templates shown side view fuselage blanks block sanded no lumps gulleys between cor responding points root tip templates ribs separated beveled top bottom edges ribs squared off ribs can copied individually entire process repeated other wing panel modifing House Balsa Shoestring kit same procedure can used reshape kit ribs fuselage rib locations marked arrowshafts fuselage placed inverted flat surface former protruding over edge arrowshafts slid through holes sides ribs placed respective positions arrowshafts arrowshafts supported tip l placed parallel tip rib shafts should rest unrestrained dowels root rib panel glued fuselage side arrowshaft careful place glue fillet around shaft ipside fuselage has dried epoxy rib its marked position arrowshafts Install 1/16 X 5/16 hard balsa basswood strip leading edge 3/16 X a strip trailing edge panel Check see strips straight root tip no bows leading-edge strip should flush ribs whereas trailing-edge strip should extend above below ribs remainder wing construction straight forward Care should taken sanding wing total area shown extremely close minimum specifications 300 sq FuselagePart 2 top hatch now taped guarantee correct alignment top deck rear top deck 3/16 bottom sheeting glued fuselage ply landing gear plat form hatch supports epoxied bottom hatch cut a sheet /8 dowel pin installed top hatch ls inset hatch drilled out hold-down screws screw heads should re cessed lower hatch screwed lower half fuselage may sanded shape cowl blocks cut shape hollowed Before glueing left cheek cowl make certain et tube channel air carb has installed lines up hollowed left cheek cowl Before attaching right cowl balsa block carved shape placed glued between former 1/16 plywood spinner ring right cheek cowl glued fuse lage block except area back former 1 dry cowl cut off razor saw inch back front former balsa plug removed used make plaster mold fiberglass engine cowl Tail Undercarriage tail parts cut 3/16 balsa sheet /8 groove cut outside edges surfaces razor saw Strips 1/64 continued page 73 10 Model Aviation Bill Fuoris Quarter Midget continued page 10 X ply glued groove pro tect edges surfaces surfaces can sanded shape shown plans elevators lower portion rudder cut off hinged rudder stab epoxied fuselage canopy added making certain minimum fuselage height S maintained Fillets stalled wing tail canopy cowls using microballoons wheel pants now constructed entire airplane final sanded suggested aluminum landing gear struts filed airfoil shape particu larly leading edge fuselage rudder wheel pants should now given coat resin coat epoxy filler sanding after fuse lage given light coat epoxy paint wing stab should covered Monokote Solar Film Equipment I have found coupled aileron rudder works fine problems Therefore necessary have two servos within fuselage aileron/rudder elevator engine servo mounted tank compartment right side fuselage proper balance receiver battery pack should mounted against former 2 tank four oz Sullivan slant type Flying The airplane will prove responsive stable adhere CG location control surface deflec tions indicated plan find set up will turn dime slightest snap roll tendency tight est turns will cause no structural damage all-up weight model does exceed 3 pounds However plane weighs would suggest whip smoothly gently turn pylon five ships Ive built still existence ranged weight 40 oz 42 oz Well guess thats about rest up engine radio FF Indoor continued page 21 cial everyone agrees much pitch too much important thing have enough pitch Luckily fairly easy determine prop pitch too low particular model Simply measure rpm just after model stops climbing As general rule properly adjusted microfilm model heavy should have cruise rpm tween 45 55 Lighter models will should have lower range rpm Measure RPM Indoor props except PennyPlane Easy B usually turn slower han 80 rpm some go low 35 rpm rhat can see prop turning common method measuring rpm time long takes prop make 10 revolu tions 9egin count 0 start watch count next time same blade comes up count other blade continue 10 Count 10 just blade passes start position 10th time Divide time seconds 600 get rpm example 8 seconds 10 revs 600/8 75 rpm Thats too high Strive 12 seconds 48 rpm 15 seconds 40 rpm Sad True reporter has never able understand indoor activity around country comes halt sum mer During warm weather models fly bet ter rubber works better rubber output proportional temperature always easier handle fragile models warm hands Nonetheless Miami Fla modelers fly indoor blimp hangers Lakehurst NJ have summer activity Miami fliers have about 10 months activity year hangars have good conditions during summer address P0 Box 545 Richardson Texas 75080 September1975 73 EOW*15005U15I5 p.idI July 1975 Dear Fellow Model Nuilders hope building leaet thoce beautiful sew Kite Flying Fortress Kingfish Gavela Prineiro now available tobby Shop way. 1/2 Nylon Anoennorien also releaaed new Kits havent seen sure oheok dealer Theyre great gain 575 end will good job Knerythiog in psohage Nylon Motor Mouot control Morn Mell Crank Nuts & Molts easy installation told about new s/C Stinson Reliant 40 engines last letter Digineering Depart ment going full speed ahead projent deliver Kits sometime Fell Im sure saw writeup Goosriator N/C Modeler know youll enjoy building flying one. want take opportunity eotend ny ninoere thanks eath emery helping make doys brighter during pant several weeks have hoes sonvelesoing surgery thoughtful reaseheronoen nnd good wishes will long remembered Weve enjoyed letters appretiete suggestions. Keop cOming 3620 G StreetPhiladelphia Pennsylvania 19134USA produotrevinswnrnd urtrao imwnnductaoieworoduttreoisw Sanding Blocks Ideal sanding large areas such wings stabs fuselages etc new sanding blocks have high-quality 3M open coat sandpaper bonded high-density foam block Available three grits size 9 x 3-3/4 89 cents Prather Products 1660 Ravenna Ave. Wilming ton Ca 90744 Tricks tradethe bent fuselage design Stan Chilton gives model high thrust line prodwctaoiewprodwcOeoiewPodwctrCoiCWPrOdwCtrCoiCW otherwise normal layout Other structural details show up clearly
Edition: Model Aviation - 1975/09
Page Numbers: 6, 7, 10, 73
MARA champion after year tough competition Powered K&B 15 Rev-Up 7-6 Series 400 prop Top Flite 7-6 narrow works equally well All-up weight 2-1/2 pounds nose minus 2-1/2 oz fuel Bill Fuoris Quarter Midget THE MODEL see accom panymg photos result evolu tionary process about two years began purchase House Balsa Shoestring kit finest kits ever seen quite evident great deal thought gone engine com partment design method constructing wing found instructions easy follow resulting model faster its competition Soon however others realized merits Shoe string new appearing virtu ally race realized some modifications necessary maintain edge over competi tion began experimenting air foil As kit wing approximately l/t thicker root minimum al lowable specs began streamlining wing As result several experiments came up two improvements over kit airfoil proved best shortened course currently used Cali fornia suggested modification rules other best current course short-course airfoil shown top righthand corner construction plan long-course airfoil shown profile view fuselage also experimented foam wing performed equally well built-up wing care taken keep light about construction details later next change seemed apparent slim streamline fuselage Since coupled aileron rud der see half rudder plans no longer required fuselage width capable supporting three servos across Slimming fuselage frontal area resulted 6 Model Aviation Recessing hold-down screws hatch reduces drag increases overall appearance Use liberal fillets blend cheek cowls between wing fuselage essential engine head protruding through cheek cowl prefer completely cowled engine result above changes together some construction variations dis cussed later resulted truly competi tive racer can supported fact has brought home hardware races held MARA Metropolitan Air Racing Assoc ever has assets simply raw speed Its greatest asset its ease handling stability have never found drop slightest tightest turns no opposite rudder required accomplish model may constructed scratch using built-up foam wing may constructed modifying House Balsa Shoestring Kit would suggest latter time critical factor remainder article will describe steps scratch-building model first step determine whether built up foam type wing will used Construction times will similar resulting built-up wing being couple ounces lighter equally strong Once type wing has determined fuselage construction can commence Construction FuselagePart 1 Begin fuselage construction cutting out 1/8 fuse lage sides 1/32 plywood doubler three plywood formers im portant select matched sheets sides cut out holes dou bler allow sides contour properly well keep down overall weight wing foam type diam eter front two lightening holes reduced shaded area shown plan must marked fuselage sides later removal plywood doublers epoxied sides being certain make left right side has thoroughly dried mark position formers 2 3 built-up wing used mark drill out holes fiberglass arrowshafts Glue 5/16 triangular strips top bottom side leaving cutout former 3 Install ngular stock bottom side between formers 2 2 balsa hatch supports between formers 2 3 1/16 X s/s cross brace Formers 2 3 epoxied sides sure formers square fuse lage sides After has set former triangular filler rear epoxied assembly set aside dry thoroughly Next epoxy 2 lsa block front former right-angle former right face block must line up center line former Cut out epoxy 1 diameter ply disk front block cen tered respect engine thrust-line continued page 10 September 1975 7 adequate room receiver battery switch two servos elevator coupled rudder/ aileron Throttle servo mounted tank compartment easy access Note airfoil shape filed aluminum gear struts After painting nuts holding wheel pants place moved inside pants bolt ends cutoff reduce drag Quarter-inch plywood serves rear floor tank compartment mounting platform landing gear rear holes lower hatch front holes Upper hatch provides quick easy access tank throttle servo inspection adjustments Aluminum carrying case 148 x 48 x 10 long trips date no airline has refused accept luggage will provide special handling arranged advance Basic structure lacking elevators ailerons wing tips Note large wing filletsa key factorFiberglass cowl simple construct reducing drag Fuselage rudder landing gear assembly primed painted wings andsubject melting cracking vacuumstab covered Solarfilm MonoKoteformed plastic cowls Bill Fuoris Quarter Midget has dried mark location left cheek cowl rough shape block being careful touch marked cowl area bottom block must cut form straight line lower edges fuselage sides inside block now may hol lowed out allow particular engine mount r nose block now glued k laminated ks tack-glued top fuselage former aft Another such block permanently glued top fuselage front former Sand blocks close possible final shape Now mark position fuselage sides formers rear top block inside fuselage Cut block razor saw separate tank com partment hatch top deck Remove blocks hollow out per plans 1/64 ply edge protector now glued rear hatch front deck blocks now set aside until after wing has constructed Foam Wing foam-wing version follows standard construction techniques Cutouts should made plywood dihedral braces prior covering wing panel covered 1/16 sheet fitted leading-edge trailingedge tip blocks sure groove TE root accept 1/16 ply fillet support area marked out earlier fuse lage sides now removed Two pieces removed wing center section allow wing sit snugly area just removed fuselage sides Al low room stub ribs wing root Install stub ribs two ply braces installed wings joined Fiberglass should used reinforce center section wing glued fuselage Built-Up-Wing wing ribs first must cut out easily accomplished cutting out plywood aluminum root tip templates holes arrow shafts Eighteen X 9 balsa rib blanks cut out ofa piece 3/32 sheet two s drilled arrowshafts Nine blanks sand wiched between ply aluminum tem plates held place two-in -28 bolts nuts Care must taken ensure alignment tip root templates shown side view fuselage blanks block sanded no lumps gulleys between cor responding points root tip templates ribs separated beveled top bottom edges ribs squared off ribs can copied individually entire process repeated other wing panel modifing House Balsa Shoestring kit same procedure can used reshape kit ribs fuselage rib locations marked arrowshafts fuselage placed inverted flat surface former protruding over edge arrowshafts slid through holes sides ribs placed respective positions arrowshafts arrowshafts supported tip l placed parallel tip rib shafts should rest unrestrained dowels root rib panel glued fuselage side arrowshaft careful place glue fillet around shaft ipside fuselage has dried epoxy rib its marked position arrowshafts Install 1/16 X 5/16 hard balsa basswood strip leading edge 3/16 X a strip trailing edge panel Check see strips straight root tip no bows leading-edge strip should flush ribs whereas trailing-edge strip should extend above below ribs remainder wing construction straight forward Care should taken sanding wing total area shown extremely close minimum specifications 300 sq FuselagePart 2 top hatch now taped guarantee correct alignment top deck rear top deck 3/16 bottom sheeting glued fuselage ply landing gear plat form hatch supports epoxied bottom hatch cut a sheet /8 dowel pin installed top hatch ls inset hatch drilled out hold-down screws screw heads should re cessed lower hatch screwed lower half fuselage may sanded shape cowl blocks cut shape hollowed Before glueing left cheek cowl make certain et tube channel air carb has installed lines up hollowed left cheek cowl Before attaching right cowl balsa block carved shape placed glued between former 1/16 plywood spinner ring right cheek cowl glued fuse lage block except area back former 1 dry cowl cut off razor saw inch back front former balsa plug removed used make plaster mold fiberglass engine cowl Tail Undercarriage tail parts cut 3/16 balsa sheet /8 groove cut outside edges surfaces razor saw Strips 1/64 continued page 73 10 Model Aviation Bill Fuoris Quarter Midget continued page 10 X ply glued groove pro tect edges surfaces surfaces can sanded shape shown plans elevators lower portion rudder cut off hinged rudder stab epoxied fuselage canopy added making certain minimum fuselage height S maintained Fillets stalled wing tail canopy cowls using microballoons wheel pants now constructed entire airplane final sanded suggested aluminum landing gear struts filed airfoil shape particu larly leading edge fuselage rudder wheel pants should now given coat resin coat epoxy filler sanding after fuse lage given light coat epoxy paint wing stab should covered Monokote Solar Film Equipment I have found coupled aileron rudder works fine problems Therefore necessary have two servos within fuselage aileron/rudder elevator engine servo mounted tank compartment right side fuselage proper balance receiver battery pack should mounted against former 2 tank four oz Sullivan slant type Flying The airplane will prove responsive stable adhere CG location control surface deflec tions indicated plan find set up will turn dime slightest snap roll tendency tight est turns will cause no structural damage all-up weight model does exceed 3 pounds However plane weighs would suggest whip smoothly gently turn pylon five ships Ive built still existence ranged weight 40 oz 42 oz Well guess thats about rest up engine radio FF Indoor continued page 21 cial everyone agrees much pitch too much important thing have enough pitch Luckily fairly easy determine prop pitch too low particular model Simply measure rpm just after model stops climbing As general rule properly adjusted microfilm model heavy should have cruise rpm tween 45 55 Lighter models will should have lower range rpm Measure RPM Indoor props except PennyPlane Easy B usually turn slower han 80 rpm some go low 35 rpm rhat can see prop turning common method measuring rpm time long takes prop make 10 revolu tions 9egin count 0 start watch count next time same blade comes up count other blade continue 10 Count 10 just blade passes start position 10th time Divide time seconds 600 get rpm example 8 seconds 10 revs 600/8 75 rpm Thats too high Strive 12 seconds 48 rpm 15 seconds 40 rpm Sad True reporter has never able understand indoor activity around country comes halt sum mer During warm weather models fly bet ter rubber works better rubber output proportional temperature always easier handle fragile models warm hands Nonetheless Miami Fla modelers fly indoor blimp hangers Lakehurst NJ have summer activity Miami fliers have about 10 months activity year hangars have good conditions during summer address P0 Box 545 Richardson Texas 75080 September1975 73 EOW*15005U15I5 p.idI July 1975 Dear Fellow Model Nuilders hope building leaet thoce beautiful sew Kite Flying Fortress Kingfish Gavela Prineiro now available tobby Shop way. 1/2 Nylon Anoennorien also releaaed new Kits havent seen sure oheok dealer Theyre great gain 575 end will good job Knerythiog in psohage Nylon Motor Mouot control Morn Mell Crank Nuts & Molts easy installation told about new s/C Stinson Reliant 40 engines last letter Digineering Depart ment going full speed ahead projent deliver Kits sometime Fell Im sure saw writeup Goosriator N/C Modeler know youll enjoy building flying one. want take opportunity eotend ny ninoere thanks eath emery helping make doys brighter during pant several weeks have hoes sonvelesoing surgery thoughtful reaseheronoen nnd good wishes will long remembered Weve enjoyed letters appretiete suggestions. Keop cOming 3620 G StreetPhiladelphia Pennsylvania 19134USA produotrevinswnrnd urtrao imwnnductaoieworoduttreoisw Sanding Blocks Ideal sanding large areas such wings stabs fuselages etc new sanding blocks have high-quality 3M open coat sandpaper bonded high-density foam block Available three grits size 9 x 3-3/4 89 cents Prather Products 1660 Ravenna Ave. Wilming ton Ca 90744 Tricks tradethe bent fuselage design Stan Chilton gives model high thrust line prodwctaoiewprodwcOeoiewPodwctrCoiCWPrOdwCtrCoiCW otherwise normal layout Other structural details show up clearly