Pylon Racing THIS MONTH would like talk about construction techniques indi vidual has tried Pylon racing cause thinks too difficult corrected article about Q-500 air craft wing thickness 12% stead 15% stated Thanks Greg Doe correction Now construction foam wings seems lot modelers around country either like foam afraid try Foam wings difficult build follow some rather simple import ant procedures probably different ways build foam wings will attempt discuss method has successful am going assume foam core already cut desired shape article intended cover various methods cutting actual foam core art itself requires equip ment average modeler probably doesnt have laying around shop Generally foam wing cores sup plied foam block cut Examine cores uniformity smoothness will probably find some irregularities usually minor some mild sanding will things out Dave Lane building wing suplied kit manufacturer wood kit should no problem selecting proper materials wing starting wing scratch kit supplies core need talk about cover ing materials etc Wings 10% less 300 sq less can skinned 1/16 3 4 wide balsa Wings 6% up thickness over 300 sq usually require 3/32 x 3 4 wide balsa medium hard Some wings might require skins I/s thickness generally racing air craft leading trailing edges should also medium medium hard Some wings will also require rear spar med ium hard balsa Generally wing full-length rear spar will use full span aile rons torque tube linkage opera tion Wings rear spar will have inset ailerons will use pushrods bellcranks although some manufacturers use torque tubes both types wings Now lets start building wing always start wing cores core block See Fig 1 Lift top core block lay aside Now looking down wing cores doesnt make difference whether right left time top bottom does make difference edge leading trailing Start leading edge lay piece sheeting down core Line up edge sheeting edge core leading edge Take pencil ball point pen scribe line along back edge sheeting line will ap proximately down center wing core Now take second sheet wing skin lay down trailing edge wing Draw line along front edge sheet until intersects first line important keep wood grain parallel leading trailing edges Trim off portion trailing edge skin overlaps leading edge skin piece will used cover pie shaped area left between leading edge trailing edge skins assuming wing tapered Now place top core block upside down work surface lay wing core part core block repeat above steps Place center core block piece over wing core lay second wing core mark skins pre viously described After have wing skins cut matched cores sure num ber code corresponding wing core usually number 1 2 3 4 etc match cores typical racing wing will have three pieces continued page 80 CORE B OCK FIGURE 1 CORES CORE BLOCK FIGURE 3LEADING EDGETIP FOAM CORE- IREAR SPAR AILERON & TRAILING EDGES TORQUE ROD LEADING EDGE TIP a---- TRAILING EDGETORQUE RODAILERON FOAM CORE FIGURE2SPAR L _ COREL/L LEADING EDGE SKINS RAILING EDGE IS COREd--- T #2 FIGURE 4 COREBLOCKFIGURE5 SECOND WING CORE1 FIRST WING CORE August1976 19 SHEET #1 TRIM OFF SHEET SHEET #3MADE FROM SHEET #2 CUT OFF iI Exhaust Extension Perfect scale other applications extension needed no muffler required unit has machined locating slot fit engines no adaptors needed Extension 2% long comes complete mounting hardware Three sizes small 15 25 engines medium 29 40 large 49 80 $450 Exhaust Manifolds Manifolds available two styles will work boats cars airplanes Both come three sizes small 15-25 engines medium 29-401 large 45-80 have un iversal mounting slot eliminate need adaptor Suggested retail price $495 Exhaust Throttle Throttle engine exhaust type throttle system comes three standard sizes Small 15-25 engines Medium 2940 Large 45-80 mounting slot el iminates need adaptors $695 special model exhaust throttle made OPS 40 60 engines using tuned pipe t149t shnwn 300cc fuel tank especially designed boating use gravity feed type fuel pickup located bottom tank Molded extremely fuel resistant plastic tank features twist top fast fueling Suggested retail price $225 Semco makes 280 accesso ries models Send 25d catalog of mufflers tools hardware accessories available Semco RC Helicopters/Schoonard continued page 20 least 10-ft altitude separate auto-rotation landing must part free-style selec tion Scale scale contestants will need pre sent following materials entry static judging published threeview drawings pictures published other wise pertaining color markings details better presentation better can judged static judging will cover follow ing areasmaximum 25 points Fuselage cockpit landing gear rotor sys tems craftmanship finish markings Scale contestants will fly same equip ment have static judged will fly following maneuvers A 15-second hover land B Constant heading figure-of-eight starting left land C 360-degree fly-around starting left land Five minutes flight time Scale winning points will sum best two flights plus static judging points scale maneuvers will judged 0-10 have K-factor 15 complete test rules will used 1976 Helicopter Na tionals see Competition News section [My address 2080 Sharon Rd Win ter Park FL 32789] RC Pylon/Lane continued page 19 wing skin per side total 12 sec tions Number wing core same wing skins start applying skins cores will get skins same sequence Okay Lets talk about cement can use wont melt foam use Best Test rubber cement similar Carters does dry out after about six months several model contact cements market job really up individuals preference Goldbergs Blue-Goo should available time read article what have heard cement should work very well tinted blue can see have foam cores skins completely covered cement problems Best Test since has no color Once decide what type cement going use sure does attack foam coat wing cores skins Set everything aside least 30 minutes unless cement instructions call less time before attempting apply skins cores waiting time allows thinner evaporate cement put skins cores too soon thinners will attack foam melt Now have scrap have waited long enough can put cores back core block cores sticking block So using core block jig apply wing skins proper numerical order After place skin core before apply next skins sure lay bead white glue epoxy edge sheeting get good tight glue joint between skins After have skinned cores check sure straight have proper twist wash-out called plans Put cores back core block let dry hour two Now ready either glue epoxy leading trailing edges tips place Sand everything down de sired shape cut aileron per plan join wings together epoxy Peri odically assemble wing panels check sure still have proper wash-out panel have changed twist panel back shape usually can until put first coat resin glass wing sure use 1 either celastic glass tape reinforce wing center joint dont tape center joint can guarantee wing will fail center section first second flight Well hope above information will help would like build foam have becn leery stuff really difficult might think first time it will probably take longer built-up wing Once have completed couple will find can put foam wing together couple hours New month will cover technique using K&Bs Super Poxy finishing system address 4477W 136th St Haw thorne CA 90250 CL Racing/Lee continued page 28 July 7 through July 12 event being organized Royal Netherlands Aero nautical Assoc along World Championships committee will held site Utrecht Model Aero Club events will Stunt Speed Team Race Last summer good fortune help Team Race team selection finals held weekend pre ceeding Nats Lake Charles re ported results team selections December issue Model Aviation Id like take remainder col umn try introduce people comprise team representa tives World Championships FAI Team Race first-place team qualified com posed two Californians Jed Kusik 80 Model Aviation Boat Fuel Tank
Edition: Model Aviation - 1976/08
Page Numbers: 19, 80
Pylon Racing THIS MONTH would like talk about construction techniques indi vidual has tried Pylon racing cause thinks too difficult corrected article about Q-500 air craft wing thickness 12% stead 15% stated Thanks Greg Doe correction Now construction foam wings seems lot modelers around country either like foam afraid try Foam wings difficult build follow some rather simple import ant procedures probably different ways build foam wings will attempt discuss method has successful am going assume foam core already cut desired shape article intended cover various methods cutting actual foam core art itself requires equip ment average modeler probably doesnt have laying around shop Generally foam wing cores sup plied foam block cut Examine cores uniformity smoothness will probably find some irregularities usually minor some mild sanding will things out Dave Lane building wing suplied kit manufacturer wood kit should no problem selecting proper materials wing starting wing scratch kit supplies core need talk about cover ing materials etc Wings 10% less 300 sq less can skinned 1/16 3 4 wide balsa Wings 6% up thickness over 300 sq usually require 3/32 x 3 4 wide balsa medium hard Some wings might require skins I/s thickness generally racing air craft leading trailing edges should also medium medium hard Some wings will also require rear spar med ium hard balsa Generally wing full-length rear spar will use full span aile rons torque tube linkage opera tion Wings rear spar will have inset ailerons will use pushrods bellcranks although some manufacturers use torque tubes both types wings Now lets start building wing always start wing cores core block See Fig 1 Lift top core block lay aside Now looking down wing cores doesnt make difference whether right left time top bottom does make difference edge leading trailing Start leading edge lay piece sheeting down core Line up edge sheeting edge core leading edge Take pencil ball point pen scribe line along back edge sheeting line will ap proximately down center wing core Now take second sheet wing skin lay down trailing edge wing Draw line along front edge sheet until intersects first line important keep wood grain parallel leading trailing edges Trim off portion trailing edge skin overlaps leading edge skin piece will used cover pie shaped area left between leading edge trailing edge skins assuming wing tapered Now place top core block upside down work surface lay wing core part core block repeat above steps Place center core block piece over wing core lay second wing core mark skins pre viously described After have wing skins cut matched cores sure num ber code corresponding wing core usually number 1 2 3 4 etc match cores typical racing wing will have three pieces continued page 80 CORE B OCK FIGURE 1 CORES CORE BLOCK FIGURE 3LEADING EDGETIP FOAM CORE- IREAR SPAR AILERON & TRAILING EDGES TORQUE ROD LEADING EDGE TIP a---- TRAILING EDGETORQUE RODAILERON FOAM CORE FIGURE2SPAR L _ COREL/L LEADING EDGE SKINS RAILING EDGE IS COREd--- T #2 FIGURE 4 COREBLOCKFIGURE5 SECOND WING CORE1 FIRST WING CORE August1976 19 SHEET #1 TRIM OFF SHEET SHEET #3MADE FROM SHEET #2 CUT OFF iI Exhaust Extension Perfect scale other applications extension needed no muffler required unit has machined locating slot fit engines no adaptors needed Extension 2% long comes complete mounting hardware Three sizes small 15 25 engines medium 29 40 large 49 80 $450 Exhaust Manifolds Manifolds available two styles will work boats cars airplanes Both come three sizes small 15-25 engines medium 29-401 large 45-80 have un iversal mounting slot eliminate need adaptor Suggested retail price $495 Exhaust Throttle Throttle engine exhaust type throttle system comes three standard sizes Small 15-25 engines Medium 2940 Large 45-80 mounting slot el iminates need adaptors $695 special model exhaust throttle made OPS 40 60 engines using tuned pipe t149t shnwn 300cc fuel tank especially designed boating use gravity feed type fuel pickup located bottom tank Molded extremely fuel resistant plastic tank features twist top fast fueling Suggested retail price $225 Semco makes 280 accesso ries models Send 25d catalog of mufflers tools hardware accessories available Semco RC Helicopters/Schoonard continued page 20 least 10-ft altitude separate auto-rotation landing must part free-style selec tion Scale scale contestants will need pre sent following materials entry static judging published threeview drawings pictures published other wise pertaining color markings details better presentation better can judged static judging will cover follow ing areasmaximum 25 points Fuselage cockpit landing gear rotor sys tems craftmanship finish markings Scale contestants will fly same equip ment have static judged will fly following maneuvers A 15-second hover land B Constant heading figure-of-eight starting left land C 360-degree fly-around starting left land Five minutes flight time Scale winning points will sum best two flights plus static judging points scale maneuvers will judged 0-10 have K-factor 15 complete test rules will used 1976 Helicopter Na tionals see Competition News section [My address 2080 Sharon Rd Win ter Park FL 32789] RC Pylon/Lane continued page 19 wing skin per side total 12 sec tions Number wing core same wing skins start applying skins cores will get skins same sequence Okay Lets talk about cement can use wont melt foam use Best Test rubber cement similar Carters does dry out after about six months several model contact cements market job really up individuals preference Goldbergs Blue-Goo should available time read article what have heard cement should work very well tinted blue can see have foam cores skins completely covered cement problems Best Test since has no color Once decide what type cement going use sure does attack foam coat wing cores skins Set everything aside least 30 minutes unless cement instructions call less time before attempting apply skins cores waiting time allows thinner evaporate cement put skins cores too soon thinners will attack foam melt Now have scrap have waited long enough can put cores back core block cores sticking block So using core block jig apply wing skins proper numerical order After place skin core before apply next skins sure lay bead white glue epoxy edge sheeting get good tight glue joint between skins After have skinned cores check sure straight have proper twist wash-out called plans Put cores back core block let dry hour two Now ready either glue epoxy leading trailing edges tips place Sand everything down de sired shape cut aileron per plan join wings together epoxy Peri odically assemble wing panels check sure still have proper wash-out panel have changed twist panel back shape usually can until put first coat resin glass wing sure use 1 either celastic glass tape reinforce wing center joint dont tape center joint can guarantee wing will fail center section first second flight Well hope above information will help would like build foam have becn leery stuff really difficult might think first time it will probably take longer built-up wing Once have completed couple will find can put foam wing together couple hours New month will cover technique using K&Bs Super Poxy finishing system address 4477W 136th St Haw thorne CA 90250 CL Racing/Lee continued page 28 July 7 through July 12 event being organized Royal Netherlands Aero nautical Assoc along World Championships committee will held site Utrecht Model Aero Club events will Stunt Speed Team Race Last summer good fortune help Team Race team selection finals held weekend pre ceeding Nats Lake Charles re ported results team selections December issue Model Aviation Id like take remainder col umn try introduce people comprise team representa tives World Championships FAI Team Race first-place team qualified com posed two Californians Jed Kusik 80 Model Aviation Boat Fuel Tank