Stitchin

IN THE month previous written saw death three stand-off Sport Scale aircraft flying field Although various radio difficulties given reasons inex perience type aircraft real culprit case airplane became stalled uncontrollable stalls ac celerated ones tight turnstight air craft typewhich caused plane snap over top opposite direction turn cases airplane failed respond control because stalled condition incorrect command therefore radio problems blamed loss well-built Scale air craft heavy anticipation such loss quite debilitating possible point withdrawal Scale projects Scale airplanes hard fly hardest RC models have mastered peculiarities can fly ease Stitchin provides way master heart throat experience Stitchin designed advanced trainer can changed progressively smooth easy-to-fly airplane rather difficult handful steps controlled flier skill increases easy fast airplane build should need arise during training also easy repair Other standard method moving devises closer surfaces increase 14 Model Aviation L F Randolph stiff papertemplate such file folder fine-point pen canSlice ribs printed sheet Razor Knife X-Acto #11 used make printed sheet ribsblade Cut spar notches first avoid splitting As saying goes stitch time saves nine idea RC advanced trainer develop piloting skills unique variable stability concept will helpto assure successful flights Scale models much time has spentand sometimes handful Its 1O-15 engines goes together quickly control movement two additional changes can made will alter its performance markedly removal wing tip plates changing center-of-gravity CG aft location cabin designed cause turbulence over large area vertical fin rudder reduces effectiveness surfaces re duces directional stability airplane Removal wing tip plates also contribute directional stability places require ment pilot almost continuous control model short nose airplane tends wander pilot must correct changes direction maintain straight flight As CG shifted aft moving weight toward tail aircraft becomes more unstable flight until necessary control attitude same manner direction airfoil has rather pointed leading edge causes stall sooner rounded also becomes factor CG shifted rear CG its aft position wing tip plates removed airplane can made fly smoothlybut takes lot gentle stick movement sharp eye Stichin basically advanced trainer its pristine form forward CG wing tip plates best easiest small airStack sand ribs together Short spar pieces alignment Spar trailing edge webs cut sheet balsa except four plywood Suggested method wing assembly Pin main spar trailing edge work board Add ribs webs sequence near root tip April1981 15 planes have ever flown tricycle landing gear easy ground handling although Scale purist might rather have conventional tail-dragger have never enjoyed kicking airplane down runway model otherwise tricycle gear build airplane would suggest start assembling a. Kit Any scratch-built project goes easier parts gathered together before construc tion begun spars can purchased dealer stripped sheets proper thickness fuselage side cut piece 3/32 x 3 x 36 balsa some 3/32 x 2 stock - spliced make up cabin wing ribs cut 1/16 sheet pinned together gang-sanded same shape Seven ribs have / 16-in trimmed top bottom receive center sheeting marked #2and four trimmed aft main spar notch receive landing gear mount spar trailing edge webs also cVt 1/16 balsa sheet Cut plywood parts 16 Model Aviation Edges tail surfaces arent taperedjust rounded Uses Goldberg short control horns Elevator halves joins 3/16-in dowel Main landing gear legs bent 3/32-in music wire attached ply wood mounts glued ply-reinforced rubs ply spar web Spsto Eu LJ 3 t .. c..u rt c,u.c .t...lea controls rudde elevator ailerons engine speed steering ,a,ea tugeiner win dihedral braues .uInespIns excellent clamps joint Bottom sheeting shown clarity anoing gear oraces ano mounts added nearly complete wing Note plywood spar webs section wing Aileron hardwarein case 1/a-in brass tube 3/32-in wire Hold position rubberbands epoxy cures -DU-BRO AILERON F1TTINGS ON 3/ 32 WIRE RODS THRU 3/32k DTUBE1OAILERONS 3/32 SHEET BALSA TOP AND SIDES OF CANOPY SHAPED 10 CAUSE TLRBLLENCEON TAIL V8 PLYWOOD I/B BALSA FORMER STEERING ARM TO RUDDER SER0 U IO15 ENGINE ON TATONE MOUNT /8 MUSIC WIRE SPRUNG NOSE GEAR V __ 3/4DIAWHEEL CD 1/4 PLYWOOD FIREWALL 1/16 PLYWOOD DOUBLER NOSE 103 BULKHEAD -J 3/32 BALSA SHEE1 SIDES AND 8011DM 3 Va PLYWOOD BULKHEAD 3A6 SHEET BALSA RUDDER GOLDBERG ShORT HORNS 3/16 X 3/8 BALSA FRAMES 3/16 SQ BALSA RIBS 1/16 SHEET BALSA lOP AND BOT1OM FUSEIiGE 3/16 SHEET BALSA ELEVATORS JOINED ON 3/16 DOWEL 13/16 50 STABIUR I/B SQ LONGERONS AND LEANGEDGE AND BRACES / I/16X 3A6 PLYWOOD REINRRCING 1/2 OZ COLED SOLDER ON /4 DOWEL WING MOUNT 040 MUSIC WIRE AS WEIGHT 1/16 PLYD REINF FOR LGEAR MOUNT V16 SHEET BALSA WEBS I/4X 3/4AILERON TESIOCK DU-BRO HINGES I/B SO T E FILLER . - 1/16 X 7/B SHEET BALSA TOPAND BOTIOM TE /77 I/B PLYWOOD SCREW BLOCKS SMALL W SCREWS 1/16 PY WOOD TIP PLATE 3/32 BALSA END RIB I/B PLYWCtO REINFORONG FRONT AND REAR SPARS AT C/S 1/16 PLY WOOD WEBS 8E1WEEN LG RIBS 7 7 L PLYWOOD REINF AT C/S REARSPAR3/16X 1/4 BALSA LEDGE 1/4 PLYWOOD LGBLOCK ON I/B PLYWJCO PLATRRM1/16 BALSA RIBS 3/16 SQ BALSA RIB STRIJGERS HElAL CLIPS AND SCREWS3/32 MUSIC WIRE MAIN L G LEGSI 3/4 DIA MAIN WHEELS3/16 IC 3/B BALSA SPARS Fuselage Epoxy plywood doublers posi tion 3/32 fuselage sides left right Add -in longerons uprights pin both sides together plywood inside Sand both same outline Drill /4-in wing hold-down dowel holes Locate mark position two cabin formers *2 #5 inside two fuselage sides Place side flat bench using square alignment glue formers position glue set glue other side formers directly over first Use square sure side directly over other Place now-square fuselage over top view plans install firewall bring tail together glue Install control rods rudder elevator control throttle Drill appropriate holes firewall before epoxying fuselage Make sure square Sheet bottom front fuselage wing firewall 1/16 plywood install tank bulkhead plus tank its fuel lines Use foam secure tank position Sheet fuselage top firewall cabin 1/16 plywood drill install inner Nyrod nose gear steering arm Sheet rest fuselage top bottom 1/16 balsa sand wing Place left wing plan flat surface cover backing plastic films cleaners bag keep glue sticking Pin bottom trailing edge sheeting 3/16-in sub-spar bottom main spar 1/16 balsa sheeting position Starting second rib center glue plywood spar web trailing edge web position directly over plan Continue add ribs webs manner tip Note trailing edge webs go way tip Glue railing edge position bevel match top rib Glue top main spar front sub-spar leading edge top 1 / 16 sheeting installed time right wing built same way 18 Model Aviation Completed wing tip tip plate showing pads receive wooa screws attach plates Theyre meant removable uiue sormers selage half square-up triangle Ply doublers longerons uprights already glued place Join other tuselage side tormers 2 3triangle alignment Foam padding installed preparation tank Fuel line feed throughs already firewall well Tnuts engine mounting Fuci sank its plumbing installed Throttle line epoxied through firewall extending cabin area specified thickness wood Horizontal stabilizer elevator vertical stabilizer rudder completed ready hinging covering FULL-SIZE PLANS AVAILABLESEE PAGE 128 -/PyWERs r VT LllA VS VULVA 550 VAAortow SPIVV VULVA 2SC50 ALL 2 ROSS VOSA ALAS STECAIVO AVIV IA nA SQ SAG SO BALSA I6 ASCOT RALSASW DOWEl IISTVSVSII VIA IIW SOLVER GRASS 4~ASVER L~ -i72SAASV 3AVSAIRPLV 1- I______I~iiiII A-~WRRAALORAR -~ 1600ASERVOLS pgCO4JRRASSEVOIO April1981 19 3IRL2A VULVA L II DD 14P1y SCRAP L III /11 Wf II -39 SQW4SA 3ARV34RMIk N TI1 verytneng togetner see wnrn sne looks like before covering Note Bottom view servo mounting tray Note plastic tubing over screws edoes tail surfaces rounded onlynot taoered near wiringto prevent sharp screw threads cutting through ervo tray Inalalleo wion everyoning connecleu uatoery us jorwero 01flgmfle lEirooCle erso nose geer ueoeul EWUEC Jug fl IESEUOEIC UrIC wnIln switch receiver just aft Both wrapped foamprovides adjustment strain relief both wing halves complete bevel center fit dihedral angle done elevating tip inch using sanding blockguided edge work benchto sand proper angle wings joined center gluing dihedral braces both sides main spar clamping place clothespins Titebond good joint sets-up slowly enough allow time making sure everything aligned built-in warps glue dry install center rib cut clear dihedral braces Remember fill mountings aileron servo suit equipment top trailing edge sheeting centersection sheeting now installed leave top servo cutout open Insta gussets small plywood pads wing tips receive wood screws hold tip plates place Install 3/32 balsa tip caps landing gear mounts plywood braces Epoxy aileron mounting hardware trailing edge near center shown Sand completed wing 150-grit sandpaper ailerons will installed wing covered Tail group ver tical horizontal stabilizers built over plan conventional man ner Remember cover plans plastic sheet install l/t6 ply wood spar doublers leading trailing edges horizontal stab elevator cut al low travel rudder joined piece 3/16-in dowel rudder notched allow passage dowel Round dont taper outside edges both rudder elevator sand welL Covcring final assembly Sand entire airframe fine sandpaper go over tack-rag remove sanding dust original covered MonoKote material recommended Hinge surfaces epoxy ailerons torque rods hinged cabin covered silver black striping cut standard roll black film ironed-on covering complete Follow instructions packed film fuselage tail group should covered Continued page 94 20 Model Aviation u4~ .w uuu tvu pnu t ma arnmny easiiyio auterthe center-of-gravity means CG shifter behind wing Wing removed show aileron servo setup Uses Ou-Bro fittings Stitchin ready-to-go stable beginning modewith wing tip plates installed CG shifter way forward left Stitchin squirreltip plates removed CG shifter way back master mode can achieve smooth flight second nature should ready take virtually Sport Scale plane An intermediate step tip plates removed CG shifterall way forwardat Its aerobatics trainer best remove CO shifterall theway right Stitchin hung Out intermediate trainer beginning configuration tip plates CG shifter forward shes pretty docile will amazed performance gained using simple inexpen sive improvement FREE MOVEMENT450 STRONG AND LIGHTWEIGHT COMPLETELY FUELPROOF COMPATABLE WITH ALL IRON-ON MATER IALS COMES IN 3 FT LENGTHS SMALL 1/6 ORPRICE 3 ft $250 LARGE 1/4 Stitchin/Randoiph Continued page 20 before joined Strip covering away area contact glue epoxy Cut notch fuselage top sheeting receive fin leading edge covering fuselage lap covering over firewall about -in around paint firewall matching epoxy paint Drill two -in holes CG-changing weight made coiling -oz solder around 040 wire covering heatshrink tubing Bend wire shown solder ends brass grommets epoxy groinmets previously-drilled holes weight should slide along wire easily Install wing hold-down dowels cover epoxy CUT 1/4 OEEP SLIT ALONG THE FULL LENGTH OF THE MAT/I/O SuRFACES EASY TO INSTALL INSTALL H/S/GE USE IGHT P/Al TO MAKE SMALL HOLE EVERY MCII OR SO OR/P CYAA/OACRYLATE GLLK IN HOLES CAPILLARY - ACT/OR I4ILL CARRY GLUE AILIAG ENTIRE JO/NT 3 FOR ADOIT/ONAL SEWR/TI INSERT SMALL P/N EVERY FEW INCHESCUT OFF FLUSH FILL 41/0 SAAb AS NEEDED FOR FINISHING Send Free Info fine products FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97116 main gear bent 3/32-in music wire shape shown installed landing gear mounts mounting brackets small wood screws nose gear can purchased bent -in wire engine mount drilled accept act bearing wheel collars above below mount secures Mount engine servos mounted plywood tray wood screws through grommets connected rudder elevator Nyrod devises throttle nose gear steering 040 wire Bend flexible jog throttle wire engine act override spring aileron servo mounted plywood pads supported balsa uprights front back cutout connected ailerons standard hardware Attach wing tip plates small wood screws apply wing saddle tape wing mount attach wing fuselage least six rubberbands side couple diagonal Check controls working properly right direction. Flying wing tip plates place center-of-gravity proper place Stitchin dream fly groovy smooth nice slow landing speed Because rather draggy cabin doesnt pick up excess speed dive makes loops look good landings precise ailerons solid way stall spin entry recovery good fact good strong 15 will maneuver rule bookwith hands-off knifeedge thrown good measure can change first step increase movement ailerons gradually until rolls look like snaps Fly mode until smooth flight easy reduce movement its original configuration re move wing tip plates Once again gradually increase aileron movement fly until easy smooth next step elevator Gradually increase throw until clevis hole nearest elevator Fly way three tanks ful move clevis outside hole move weight back its guide will move CG about -in aft make ele vator sensitive able fly Stitchin smoothly ease full control throw aft CG no wing tip plates no Sport Scale airplane should feel uneasy tailheavy ones will fly can fly way Stitchin time saves l Materials Wood 5 sheets 1/16 x 3 x 36 medium balsa ribs trailing edges center sheeting fuselage top bottom sheeting 3 sheets 3/32 x 3 36 medium balsa fuselage sides front bottom sheeting 2 sheets 3/16 x 3 x 36 medium balsa spars leading edges gussets elevator rudder 8 pieces edium balsa trailing edge longerons uprights 2 pieces /4-in aileron stock ailerons 1 piece 1/16 x 12 x 24 plywood fuselage doublers wingtip plates spar doublers fuselage top front sheeting landing gear mount braces piece x 12 plywood formers dihedral braces main gear mounts servo tray tip pads piece /4 x 6 x 6 plywood firewall 12 -in hardwood dowel wing hold-downs 12 3/16-in hardwood dowel elevator joiner Hardware Kraft engine mount 4-oz fuel tank 1 length ea 3/32-in -in music wire landing gears Strip-aileron mounting hardware -in brass tube 3/32-in wire 2 36-in lengths inner outer Nyrod 1 length 040 wire nose gear steering tail weight mount Landing gear mounting brackets wood screws 4 additional screws wing tip plates nose gear steering arm 2 control homs 4 clevis forks aileron servo hardware 4 4-40 bolts nut plates 4 -in wheel collars 2 3/32-in wheel collars fuel line solder glue 1 roll MonoKote roll wing saddle tape 3 t34-in wheels Fun/Winter Continued page 12 him Third glider clever innovator afraid oftackling imaginative projects dont know what Henry calls thing see Clukey 2-view behind long study bird books specifically soaring feathered friends perform flying feats Now 94 Model Aviation Still Using bid Fashioned Wing HingesGO GA will gain control efficiency by__ eliminating gap between moveable stationary control surfaces GAPLESS HlNGE SLOTTER / Simplifies installation Gapless Hinges Makes Slots Ii Sizes SI Salsa CE $250

IN THE month previous written saw death three stand-off Sport Scale aircraft flying field Although various radio difficulties given reasons inex perience type aircraft real culprit case airplane became stalled uncontrollable stalls ac celerated ones tight turnstight air craft typewhich caused plane snap over top opposite direction turn cases airplane failed respond control because stalled condition incorrect command therefore radio problems blamed loss well-built Scale air craft heavy anticipation such loss quite debilitating possible point withdrawal Scale projects Scale airplanes hard fly hardest RC models have mastered peculiarities can fly ease Stitchin provides way master heart throat experience Stitchin designed advanced trainer can changed progressively smooth easy-to-fly airplane rather difficult handful steps controlled flier skill increases easy fast airplane build should need arise during training also easy repair Other standard method moving devises closer surfaces increase 14 Model Aviation L F Randolph stiff papertemplate such file folder fine-point pen canSlice ribs printed sheet Razor Knife X-Acto #11 used make printed sheet ribsblade Cut spar notches first avoid splitting As saying goes stitch time saves nine idea RC advanced trainer develop piloting skills unique variable stability concept will helpto assure successful flights Scale models much time has spentand sometimes handful Its 1O-15 engines goes together quickly control movement two additional changes can made will alter its performance markedly removal wing tip plates changing center-of-gravity CG aft location cabin designed cause turbulence over large area vertical fin rudder reduces effectiveness surfaces re duces directional stability airplane Removal wing tip plates also contribute directional stability places require ment pilot almost continuous control model short nose airplane tends wander pilot must correct changes direction maintain straight flight As CG shifted aft moving weight toward tail aircraft becomes more unstable flight until necessary control attitude same manner direction airfoil has rather pointed leading edge causes stall sooner rounded also becomes factor CG shifted rear CG its aft position wing tip plates removed airplane can made fly smoothlybut takes lot gentle stick movement sharp eye Stichin basically advanced trainer its pristine form forward CG wing tip plates best easiest small airStack sand ribs together Short spar pieces alignment Spar trailing edge webs cut sheet balsa except four plywood Suggested method wing assembly Pin main spar trailing edge work board Add ribs webs sequence near root tip April1981 15 planes have ever flown tricycle landing gear easy ground handling although Scale purist might rather have conventional tail-dragger have never enjoyed kicking airplane down runway model otherwise tricycle gear build airplane would suggest start assembling a. Kit Any scratch-built project goes easier parts gathered together before construc tion begun spars can purchased dealer stripped sheets proper thickness fuselage side cut piece 3/32 x 3 x 36 balsa some 3/32 x 2 stock - spliced make up cabin wing ribs cut 1/16 sheet pinned together gang-sanded same shape Seven ribs have / 16-in trimmed top bottom receive center sheeting marked #2and four trimmed aft main spar notch receive landing gear mount spar trailing edge webs also cVt 1/16 balsa sheet Cut plywood parts 16 Model Aviation Edges tail surfaces arent taperedjust rounded Uses Goldberg short control horns Elevator halves joins 3/16-in dowel Main landing gear legs bent 3/32-in music wire attached ply wood mounts glued ply-reinforced rubs ply spar web Spsto Eu LJ 3 t .. c..u rt c,u.c .t...lea controls rudde elevator ailerons engine speed steering ,a,ea tugeiner win dihedral braues .uInespIns excellent clamps joint Bottom sheeting shown clarity anoing gear oraces ano mounts added nearly complete wing Note plywood spar webs section wing Aileron hardwarein case 1/a-in brass tube 3/32-in wire Hold position rubberbands epoxy cures -DU-BRO AILERON F1TTINGS ON 3/ 32 WIRE RODS THRU 3/32k DTUBE1OAILERONS 3/32 SHEET BALSA TOP AND SIDES OF CANOPY SHAPED 10 CAUSE TLRBLLENCEON TAIL V8 PLYWOOD I/B BALSA FORMER STEERING ARM TO RUDDER SER0 U IO15 ENGINE ON TATONE MOUNT /8 MUSIC WIRE SPRUNG NOSE GEAR V __ 3/4DIAWHEEL CD 1/4 PLYWOOD FIREWALL 1/16 PLYWOOD DOUBLER NOSE 103 BULKHEAD -J 3/32 BALSA SHEE1 SIDES AND 8011DM 3 Va PLYWOOD BULKHEAD 3A6 SHEET BALSA RUDDER GOLDBERG ShORT HORNS 3/16 X 3/8 BALSA FRAMES 3/16 SQ BALSA RIBS 1/16 SHEET BALSA lOP AND BOT1OM FUSEIiGE 3/16 SHEET BALSA ELEVATORS JOINED ON 3/16 DOWEL 13/16 50 STABIUR I/B SQ LONGERONS AND LEANGEDGE AND BRACES / I/16X 3A6 PLYWOOD REINRRCING 1/2 OZ COLED SOLDER ON /4 DOWEL WING MOUNT 040 MUSIC WIRE AS WEIGHT 1/16 PLYD REINF FOR LGEAR MOUNT V16 SHEET BALSA WEBS I/4X 3/4AILERON TESIOCK DU-BRO HINGES I/B SO T E FILLER . - 1/16 X 7/B SHEET BALSA TOPAND BOTIOM TE /77 I/B PLYWOOD SCREW BLOCKS SMALL W SCREWS 1/16 PY WOOD TIP PLATE 3/32 BALSA END RIB I/B PLYWCtO REINFORONG FRONT AND REAR SPARS AT C/S 1/16 PLY WOOD WEBS 8E1WEEN LG RIBS 7 7 L PLYWOOD REINF AT C/S REARSPAR3/16X 1/4 BALSA LEDGE 1/4 PLYWOOD LGBLOCK ON I/B PLYWJCO PLATRRM1/16 BALSA RIBS 3/16 SQ BALSA RIB STRIJGERS HElAL CLIPS AND SCREWS3/32 MUSIC WIRE MAIN L G LEGSI 3/4 DIA MAIN WHEELS3/16 IC 3/B BALSA SPARS Fuselage Epoxy plywood doublers posi tion 3/32 fuselage sides left right Add -in longerons uprights pin both sides together plywood inside Sand both same outline Drill /4-in wing hold-down dowel holes Locate mark position two cabin formers *2 #5 inside two fuselage sides Place side flat bench using square alignment glue formers position glue set glue other side formers directly over first Use square sure side directly over other Place now-square fuselage over top view plans install firewall bring tail together glue Install control rods rudder elevator control throttle Drill appropriate holes firewall before epoxying fuselage Make sure square Sheet bottom front fuselage wing firewall 1/16 plywood install tank bulkhead plus tank its fuel lines Use foam secure tank position Sheet fuselage top firewall cabin 1/16 plywood drill install inner Nyrod nose gear steering arm Sheet rest fuselage top bottom 1/16 balsa sand wing Place left wing plan flat surface cover backing plastic films cleaners bag keep glue sticking Pin bottom trailing edge sheeting 3/16-in sub-spar bottom main spar 1/16 balsa sheeting position Starting second rib center glue plywood spar web trailing edge web position directly over plan Continue add ribs webs manner tip Note trailing edge webs go way tip Glue railing edge position bevel match top rib Glue top main spar front sub-spar leading edge top 1 / 16 sheeting installed time right wing built same way 18 Model Aviation Completed wing tip tip plate showing pads receive wooa screws attach plates Theyre meant removable uiue sormers selage half square-up triangle Ply doublers longerons uprights already glued place Join other tuselage side tormers 2 3triangle alignment Foam padding installed preparation tank Fuel line feed throughs already firewall well Tnuts engine mounting Fuci sank its plumbing installed Throttle line epoxied through firewall extending cabin area specified thickness wood Horizontal stabilizer elevator vertical stabilizer rudder completed ready hinging covering FULL-SIZE PLANS AVAILABLESEE PAGE 128 -/PyWERs r VT LllA VS VULVA 550 VAAortow SPIVV VULVA 2SC50 ALL 2 ROSS VOSA ALAS STECAIVO AVIV IA nA SQ SAG SO BALSA I6 ASCOT RALSASW DOWEl IISTVSVSII VIA IIW SOLVER GRASS 4~ASVER L~ -i72SAASV 3AVSAIRPLV 1- I______I~iiiII A-~WRRAALORAR -~ 1600ASERVOLS pgCO4JRRASSEVOIO April1981 19 3IRL2A VULVA L II DD 14P1y SCRAP L III /11 Wf II -39 SQW4SA 3ARV34RMIk N TI1 verytneng togetner see wnrn sne looks like before covering Note Bottom view servo mounting tray Note plastic tubing over screws edoes tail surfaces rounded onlynot taoered near wiringto prevent sharp screw threads cutting through ervo tray Inalalleo wion everyoning connecleu uatoery us jorwero 01flgmfle lEirooCle erso nose geer ueoeul EWUEC Jug fl IESEUOEIC UrIC wnIln switch receiver just aft Both wrapped foamprovides adjustment strain relief both wing halves complete bevel center fit dihedral angle done elevating tip inch using sanding blockguided edge work benchto sand proper angle wings joined center gluing dihedral braces both sides main spar clamping place clothespins Titebond good joint sets-up slowly enough allow time making sure everything aligned built-in warps glue dry install center rib cut clear dihedral braces Remember fill mountings aileron servo suit equipment top trailing edge sheeting centersection sheeting now installed leave top servo cutout open Insta gussets small plywood pads wing tips receive wood screws hold tip plates place Install 3/32 balsa tip caps landing gear mounts plywood braces Epoxy aileron mounting hardware trailing edge near center shown Sand completed wing 150-grit sandpaper ailerons will installed wing covered Tail group ver tical horizontal stabilizers built over plan conventional man ner Remember cover plans plastic sheet install l/t6 ply wood spar doublers leading trailing edges horizontal stab elevator cut al low travel rudder joined piece 3/16-in dowel rudder notched allow passage dowel Round dont taper outside edges both rudder elevator sand welL Covcring final assembly Sand entire airframe fine sandpaper go over tack-rag remove sanding dust original covered MonoKote material recommended Hinge surfaces epoxy ailerons torque rods hinged cabin covered silver black striping cut standard roll black film ironed-on covering complete Follow instructions packed film fuselage tail group should covered Continued page 94 20 Model Aviation u4~ .w uuu tvu pnu t ma arnmny easiiyio auterthe center-of-gravity means CG shifter behind wing Wing removed show aileron servo setup Uses Ou-Bro fittings Stitchin ready-to-go stable beginning modewith wing tip plates installed CG shifter way forward left Stitchin squirreltip plates removed CG shifter way back master mode can achieve smooth flight second nature should ready take virtually Sport Scale plane An intermediate step tip plates removed CG shifterall way forwardat Its aerobatics trainer best remove CO shifterall theway right Stitchin hung Out intermediate trainer beginning configuration tip plates CG shifter forward shes pretty docile will amazed performance gained using simple inexpen sive improvement FREE MOVEMENT450 STRONG AND LIGHTWEIGHT COMPLETELY FUELPROOF COMPATABLE WITH ALL IRON-ON MATER IALS COMES IN 3 FT LENGTHS SMALL 1/6 ORPRICE 3 ft $250 LARGE 1/4 Stitchin/Randoiph Continued page 20 before joined Strip covering away area contact glue epoxy Cut notch fuselage top sheeting receive fin leading edge covering fuselage lap covering over firewall about -in around paint firewall matching epoxy paint Drill two -in holes CG-changing weight made coiling -oz solder around 040 wire covering heatshrink tubing Bend wire shown solder ends brass grommets epoxy groinmets previously-drilled holes weight should slide along wire easily Install wing hold-down dowels cover epoxy CUT 1/4 OEEP SLIT ALONG THE FULL LENGTH OF THE MAT/I/O SuRFACES EASY TO INSTALL INSTALL H/S/GE USE IGHT P/Al TO MAKE SMALL HOLE EVERY MCII OR SO OR/P CYAA/OACRYLATE GLLK IN HOLES CAPILLARY - ACT/OR I4ILL CARRY GLUE AILIAG ENTIRE JO/NT 3 FOR ADOIT/ONAL SEWR/TI INSERT SMALL P/N EVERY FEW INCHESCUT OFF FLUSH FILL 41/0 SAAb AS NEEDED FOR FINISHING Send Free Info fine products FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97116 main gear bent 3/32-in music wire shape shown installed landing gear mounts mounting brackets small wood screws nose gear can purchased bent -in wire engine mount drilled accept act bearing wheel collars above below mount secures Mount engine servos mounted plywood tray wood screws through grommets connected rudder elevator Nyrod devises throttle nose gear steering 040 wire Bend flexible jog throttle wire engine act override spring aileron servo mounted plywood pads supported balsa uprights front back cutout connected ailerons standard hardware Attach wing tip plates small wood screws apply wing saddle tape wing mount attach wing fuselage least six rubberbands side couple diagonal Check controls working properly right direction. Flying wing tip plates place center-of-gravity proper place Stitchin dream fly groovy smooth nice slow landing speed Because rather draggy cabin doesnt pick up excess speed dive makes loops look good landings precise ailerons solid way stall spin entry recovery good fact good strong 15 will maneuver rule bookwith hands-off knifeedge thrown good measure can change first step increase movement ailerons gradually until rolls look like snaps Fly mode until smooth flight easy reduce movement its original configuration re move wing tip plates Once again gradually increase aileron movement fly until easy smooth next step elevator Gradually increase throw until clevis hole nearest elevator Fly way three tanks ful move clevis outside hole move weight back its guide will move CG about -in aft make ele vator sensitive able fly Stitchin smoothly ease full control throw aft CG no wing tip plates no Sport Scale airplane should feel uneasy tailheavy ones will fly can fly way Stitchin time saves l Materials Wood 5 sheets 1/16 x 3 x 36 medium balsa ribs trailing edges center sheeting fuselage top bottom sheeting 3 sheets 3/32 x 3 36 medium balsa fuselage sides front bottom sheeting 2 sheets 3/16 x 3 x 36 medium balsa spars leading edges gussets elevator rudder 8 pieces edium balsa trailing edge longerons uprights 2 pieces /4-in aileron stock ailerons 1 piece 1/16 x 12 x 24 plywood fuselage doublers wingtip plates spar doublers fuselage top front sheeting landing gear mount braces piece x 12 plywood formers dihedral braces main gear mounts servo tray tip pads piece /4 x 6 x 6 plywood firewall 12 -in hardwood dowel wing hold-downs 12 3/16-in hardwood dowel elevator joiner Hardware Kraft engine mount 4-oz fuel tank 1 length ea 3/32-in -in music wire landing gears Strip-aileron mounting hardware -in brass tube 3/32-in wire 2 36-in lengths inner outer Nyrod 1 length 040 wire nose gear steering tail weight mount Landing gear mounting brackets wood screws 4 additional screws wing tip plates nose gear steering arm 2 control homs 4 clevis forks aileron servo hardware 4 4-40 bolts nut plates 4 -in wheel collars 2 3/32-in wheel collars fuel line solder glue 1 roll MonoKote roll wing saddle tape 3 t34-in wheels Fun/Winter Continued page 12 him Third glider clever innovator afraid oftackling imaginative projects dont know what Henry calls thing see Clukey 2-view behind long study bird books specifically soaring feathered friends perform flying feats Now 94 Model Aviation Still Using bid Fashioned Wing HingesGO GA will gain control efficiency by__ eliminating gap between moveable stationary control surfaces GAPLESS HlNGE SLOTTER / Simplifies installation Gapless Hinges Makes Slots Ii Sizes SI Salsa CE $250

IN THE month previous written saw death three stand-off Sport Scale aircraft flying field Although various radio difficulties given reasons inex perience type aircraft real culprit case airplane became stalled uncontrollable stalls ac celerated ones tight turnstight air craft typewhich caused plane snap over top opposite direction turn cases airplane failed respond control because stalled condition incorrect command therefore radio problems blamed loss well-built Scale air craft heavy anticipation such loss quite debilitating possible point withdrawal Scale projects Scale airplanes hard fly hardest RC models have mastered peculiarities can fly ease Stitchin provides way master heart throat experience Stitchin designed advanced trainer can changed progressively smooth easy-to-fly airplane rather difficult handful steps controlled flier skill increases easy fast airplane build should need arise during training also easy repair Other standard method moving devises closer surfaces increase 14 Model Aviation L F Randolph stiff papertemplate such file folder fine-point pen canSlice ribs printed sheet Razor Knife X-Acto #11 used make printed sheet ribsblade Cut spar notches first avoid splitting As saying goes stitch time saves nine idea RC advanced trainer develop piloting skills unique variable stability concept will helpto assure successful flights Scale models much time has spentand sometimes handful Its 1O-15 engines goes together quickly control movement two additional changes can made will alter its performance markedly removal wing tip plates changing center-of-gravity CG aft location cabin designed cause turbulence over large area vertical fin rudder reduces effectiveness surfaces re duces directional stability airplane Removal wing tip plates also contribute directional stability places require ment pilot almost continuous control model short nose airplane tends wander pilot must correct changes direction maintain straight flight As CG shifted aft moving weight toward tail aircraft becomes more unstable flight until necessary control attitude same manner direction airfoil has rather pointed leading edge causes stall sooner rounded also becomes factor CG shifted rear CG its aft position wing tip plates removed airplane can made fly smoothlybut takes lot gentle stick movement sharp eye Stichin basically advanced trainer its pristine form forward CG wing tip plates best easiest small airStack sand ribs together Short spar pieces alignment Spar trailing edge webs cut sheet balsa except four plywood Suggested method wing assembly Pin main spar trailing edge work board Add ribs webs sequence near root tip April1981 15 planes have ever flown tricycle landing gear easy ground handling although Scale purist might rather have conventional tail-dragger have never enjoyed kicking airplane down runway model otherwise tricycle gear build airplane would suggest start assembling a. Kit Any scratch-built project goes easier parts gathered together before construc tion begun spars can purchased dealer stripped sheets proper thickness fuselage side cut piece 3/32 x 3 x 36 balsa some 3/32 x 2 stock - spliced make up cabin wing ribs cut 1/16 sheet pinned together gang-sanded same shape Seven ribs have / 16-in trimmed top bottom receive center sheeting marked #2and four trimmed aft main spar notch receive landing gear mount spar trailing edge webs also cVt 1/16 balsa sheet Cut plywood parts 16 Model Aviation Edges tail surfaces arent taperedjust rounded Uses Goldberg short control horns Elevator halves joins 3/16-in dowel Main landing gear legs bent 3/32-in music wire attached ply wood mounts glued ply-reinforced rubs ply spar web Spsto Eu LJ 3 t .. c..u rt c,u.c .t...lea controls rudde elevator ailerons engine speed steering ,a,ea tugeiner win dihedral braues .uInespIns excellent clamps joint Bottom sheeting shown clarity anoing gear oraces ano mounts added nearly complete wing Note plywood spar webs section wing Aileron hardwarein case 1/a-in brass tube 3/32-in wire Hold position rubberbands epoxy cures -DU-BRO AILERON F1TTINGS ON 3/ 32 WIRE RODS THRU 3/32k DTUBE1OAILERONS 3/32 SHEET BALSA TOP AND SIDES OF CANOPY SHAPED 10 CAUSE TLRBLLENCEON TAIL V8 PLYWOOD I/B BALSA FORMER STEERING ARM TO RUDDER SER0 U IO15 ENGINE ON TATONE MOUNT /8 MUSIC WIRE SPRUNG NOSE GEAR V __ 3/4DIAWHEEL CD 1/4 PLYWOOD FIREWALL 1/16 PLYWOOD DOUBLER NOSE 103 BULKHEAD -J 3/32 BALSA SHEE1 SIDES AND 8011DM 3 Va PLYWOOD BULKHEAD 3A6 SHEET BALSA RUDDER GOLDBERG ShORT HORNS 3/16 X 3/8 BALSA FRAMES 3/16 SQ BALSA RIBS 1/16 SHEET BALSA lOP AND BOT1OM FUSEIiGE 3/16 SHEET BALSA ELEVATORS JOINED ON 3/16 DOWEL 13/16 50 STABIUR I/B SQ LONGERONS AND LEANGEDGE AND BRACES / I/16X 3A6 PLYWOOD REINRRCING 1/2 OZ COLED SOLDER ON /4 DOWEL WING MOUNT 040 MUSIC WIRE AS WEIGHT 1/16 PLYD REINF FOR LGEAR MOUNT V16 SHEET BALSA WEBS I/4X 3/4AILERON TESIOCK DU-BRO HINGES I/B SO T E FILLER . - 1/16 X 7/B SHEET BALSA TOPAND BOTIOM TE /77 I/B PLYWOOD SCREW BLOCKS SMALL W SCREWS 1/16 PY WOOD TIP PLATE 3/32 BALSA END RIB I/B PLYWCtO REINFORONG FRONT AND REAR SPARS AT C/S 1/16 PLY WOOD WEBS 8E1WEEN LG RIBS 7 7 L PLYWOOD REINF AT C/S REARSPAR3/16X 1/4 BALSA LEDGE 1/4 PLYWOOD LGBLOCK ON I/B PLYWJCO PLATRRM1/16 BALSA RIBS 3/16 SQ BALSA RIB STRIJGERS HElAL CLIPS AND SCREWS3/32 MUSIC WIRE MAIN L G LEGSI 3/4 DIA MAIN WHEELS3/16 IC 3/B BALSA SPARS Fuselage Epoxy plywood doublers posi tion 3/32 fuselage sides left right Add -in longerons uprights pin both sides together plywood inside Sand both same outline Drill /4-in wing hold-down dowel holes Locate mark position two cabin formers *2 #5 inside two fuselage sides Place side flat bench using square alignment glue formers position glue set glue other side formers directly over first Use square sure side directly over other Place now-square fuselage over top view plans install firewall bring tail together glue Install control rods rudder elevator control throttle Drill appropriate holes firewall before epoxying fuselage Make sure square Sheet bottom front fuselage wing firewall 1/16 plywood install tank bulkhead plus tank its fuel lines Use foam secure tank position Sheet fuselage top firewall cabin 1/16 plywood drill install inner Nyrod nose gear steering arm Sheet rest fuselage top bottom 1/16 balsa sand wing Place left wing plan flat surface cover backing plastic films cleaners bag keep glue sticking Pin bottom trailing edge sheeting 3/16-in sub-spar bottom main spar 1/16 balsa sheeting position Starting second rib center glue plywood spar web trailing edge web position directly over plan Continue add ribs webs manner tip Note trailing edge webs go way tip Glue railing edge position bevel match top rib Glue top main spar front sub-spar leading edge top 1 / 16 sheeting installed time right wing built same way 18 Model Aviation Completed wing tip tip plate showing pads receive wooa screws attach plates Theyre meant removable uiue sormers selage half square-up triangle Ply doublers longerons uprights already glued place Join other tuselage side tormers 2 3triangle alignment Foam padding installed preparation tank Fuel line feed throughs already firewall well Tnuts engine mounting Fuci sank its plumbing installed Throttle line epoxied through firewall extending cabin area specified thickness wood Horizontal stabilizer elevator vertical stabilizer rudder completed ready hinging covering FULL-SIZE PLANS AVAILABLESEE PAGE 128 -/PyWERs r VT LllA VS VULVA 550 VAAortow SPIVV VULVA 2SC50 ALL 2 ROSS VOSA ALAS STECAIVO AVIV IA nA SQ SAG SO BALSA I6 ASCOT RALSASW DOWEl IISTVSVSII VIA IIW SOLVER GRASS 4~ASVER L~ -i72SAASV 3AVSAIRPLV 1- I______I~iiiII A-~WRRAALORAR -~ 1600ASERVOLS pgCO4JRRASSEVOIO April1981 19 3IRL2A VULVA L II DD 14P1y SCRAP L III /11 Wf II -39 SQW4SA 3ARV34RMIk N TI1 verytneng togetner see wnrn sne looks like before covering Note Bottom view servo mounting tray Note plastic tubing over screws edoes tail surfaces rounded onlynot taoered near wiringto prevent sharp screw threads cutting through ervo tray Inalalleo wion everyoning connecleu uatoery us jorwero 01flgmfle lEirooCle erso nose geer ueoeul EWUEC Jug fl IESEUOEIC UrIC wnIln switch receiver just aft Both wrapped foamprovides adjustment strain relief both wing halves complete bevel center fit dihedral angle done elevating tip inch using sanding blockguided edge work benchto sand proper angle wings joined center gluing dihedral braces both sides main spar clamping place clothespins Titebond good joint sets-up slowly enough allow time making sure everything aligned built-in warps glue dry install center rib cut clear dihedral braces Remember fill mountings aileron servo suit equipment top trailing edge sheeting centersection sheeting now installed leave top servo cutout open Insta gussets small plywood pads wing tips receive wood screws hold tip plates place Install 3/32 balsa tip caps landing gear mounts plywood braces Epoxy aileron mounting hardware trailing edge near center shown Sand completed wing 150-grit sandpaper ailerons will installed wing covered Tail group ver tical horizontal stabilizers built over plan conventional man ner Remember cover plans plastic sheet install l/t6 ply wood spar doublers leading trailing edges horizontal stab elevator cut al low travel rudder joined piece 3/16-in dowel rudder notched allow passage dowel Round dont taper outside edges both rudder elevator sand welL Covcring final assembly Sand entire airframe fine sandpaper go over tack-rag remove sanding dust original covered MonoKote material recommended Hinge surfaces epoxy ailerons torque rods hinged cabin covered silver black striping cut standard roll black film ironed-on covering complete Follow instructions packed film fuselage tail group should covered Continued page 94 20 Model Aviation u4~ .w uuu tvu pnu t ma arnmny easiiyio auterthe center-of-gravity means CG shifter behind wing Wing removed show aileron servo setup Uses Ou-Bro fittings Stitchin ready-to-go stable beginning modewith wing tip plates installed CG shifter way forward left Stitchin squirreltip plates removed CG shifter way back master mode can achieve smooth flight second nature should ready take virtually Sport Scale plane An intermediate step tip plates removed CG shifterall way forwardat Its aerobatics trainer best remove CO shifterall theway right Stitchin hung Out intermediate trainer beginning configuration tip plates CG shifter forward shes pretty docile will amazed performance gained using simple inexpen sive improvement FREE MOVEMENT450 STRONG AND LIGHTWEIGHT COMPLETELY FUELPROOF COMPATABLE WITH ALL IRON-ON MATER IALS COMES IN 3 FT LENGTHS SMALL 1/6 ORPRICE 3 ft $250 LARGE 1/4 Stitchin/Randoiph Continued page 20 before joined Strip covering away area contact glue epoxy Cut notch fuselage top sheeting receive fin leading edge covering fuselage lap covering over firewall about -in around paint firewall matching epoxy paint Drill two -in holes CG-changing weight made coiling -oz solder around 040 wire covering heatshrink tubing Bend wire shown solder ends brass grommets epoxy groinmets previously-drilled holes weight should slide along wire easily Install wing hold-down dowels cover epoxy CUT 1/4 OEEP SLIT ALONG THE FULL LENGTH OF THE MAT/I/O SuRFACES EASY TO INSTALL INSTALL H/S/GE USE IGHT P/Al TO MAKE SMALL HOLE EVERY MCII OR SO OR/P CYAA/OACRYLATE GLLK IN HOLES CAPILLARY - ACT/OR I4ILL CARRY GLUE AILIAG ENTIRE JO/NT 3 FOR ADOIT/ONAL SEWR/TI INSERT SMALL P/N EVERY FEW INCHESCUT OFF FLUSH FILL 41/0 SAAb AS NEEDED FOR FINISHING Send Free Info fine products FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97116 main gear bent 3/32-in music wire shape shown installed landing gear mounts mounting brackets small wood screws nose gear can purchased bent -in wire engine mount drilled accept act bearing wheel collars above below mount secures Mount engine servos mounted plywood tray wood screws through grommets connected rudder elevator Nyrod devises throttle nose gear steering 040 wire Bend flexible jog throttle wire engine act override spring aileron servo mounted plywood pads supported balsa uprights front back cutout connected ailerons standard hardware Attach wing tip plates small wood screws apply wing saddle tape wing mount attach wing fuselage least six rubberbands side couple diagonal Check controls working properly right direction. Flying wing tip plates place center-of-gravity proper place Stitchin dream fly groovy smooth nice slow landing speed Because rather draggy cabin doesnt pick up excess speed dive makes loops look good landings precise ailerons solid way stall spin entry recovery good fact good strong 15 will maneuver rule bookwith hands-off knifeedge thrown good measure can change first step increase movement ailerons gradually until rolls look like snaps Fly mode until smooth flight easy reduce movement its original configuration re move wing tip plates Once again gradually increase aileron movement fly until easy smooth next step elevator Gradually increase throw until clevis hole nearest elevator Fly way three tanks ful move clevis outside hole move weight back its guide will move CG about -in aft make ele vator sensitive able fly Stitchin smoothly ease full control throw aft CG no wing tip plates no Sport Scale airplane should feel uneasy tailheavy ones will fly can fly way Stitchin time saves l Materials Wood 5 sheets 1/16 x 3 x 36 medium balsa ribs trailing edges center sheeting fuselage top bottom sheeting 3 sheets 3/32 x 3 36 medium balsa fuselage sides front bottom sheeting 2 sheets 3/16 x 3 x 36 medium balsa spars leading edges gussets elevator rudder 8 pieces edium balsa trailing edge longerons uprights 2 pieces /4-in aileron stock ailerons 1 piece 1/16 x 12 x 24 plywood fuselage doublers wingtip plates spar doublers fuselage top front sheeting landing gear mount braces piece x 12 plywood formers dihedral braces main gear mounts servo tray tip pads piece /4 x 6 x 6 plywood firewall 12 -in hardwood dowel wing hold-downs 12 3/16-in hardwood dowel elevator joiner Hardware Kraft engine mount 4-oz fuel tank 1 length ea 3/32-in -in music wire landing gears Strip-aileron mounting hardware -in brass tube 3/32-in wire 2 36-in lengths inner outer Nyrod 1 length 040 wire nose gear steering tail weight mount Landing gear mounting brackets wood screws 4 additional screws wing tip plates nose gear steering arm 2 control homs 4 clevis forks aileron servo hardware 4 4-40 bolts nut plates 4 -in wheel collars 2 3/32-in wheel collars fuel line solder glue 1 roll MonoKote roll wing saddle tape 3 t34-in wheels Fun/Winter Continued page 12 him Third glider clever innovator afraid oftackling imaginative projects dont know what Henry calls thing see Clukey 2-view behind long study bird books specifically soaring feathered friends perform flying feats Now 94 Model Aviation Still Using bid Fashioned Wing HingesGO GA will gain control efficiency by__ eliminating gap between moveable stationary control surfaces GAPLESS HlNGE SLOTTER / Simplifies installation Gapless Hinges Makes Slots Ii Sizes SI Salsa CE $250