Top The family portrait Theyve successful too capturing wins 1/2A A-B C-D classes Free Flight Left author prepares fire up winning flight Class event 1986 Nats Lake Charles Right get moat out short engine runs allowed imperative get weight low possible translates carbon fiber because little else market can match its strength weight ratio 76 Model Aviation Its always type construction plus type material used determined strength given structure both sophisticated model have expect superior results THE PUN its name no idle boast Ex-Cels high achiever indeed stateof-the-art model capable meeting challenge new Category III flyoff rules Although its named series Above main wing panel pinned position addition carbon fiber CF cap strips Above right wing tip biocked up warped position 1/16-in washout giuing CF caps strips Note easy-does-it jig instaliing poiyhedrai rib correct angie Right front end sports very iight Tomy timer trips fuei pinch off unit iocated ciose venturi troubie-free piumbing very attractive Magnaiite iogo avaiiabie Bob Vioiett modeis carbon fiber X-cells glued together form light strong rigid structure like implied salute performs too design am indebted Bob Bill Hunter well number others ideas have used elaborated upon Parts finished Ex-Cels re semble versions couldnt have done However good second look will show Ex-Cels has undergone evolutionary stages Using very unorthodox construction methods materials experimented until satis fied Id made necessary changes design parameters establish near-opti mum performance Fin area increased control wandering tendency power variable incidence tail plane added optimum glide adjustment airfoil changed 9% wing area increased wing taper improved overall drag re duced still maintaining actual lift characteristics wing changes along ultra-light construction have enhanced glide Because reduced drag lighter weight model altitude gained power has improved ultra-light tail feathers have made feasible lengthen tail moment nose has shortened adding stability power wing built no warps main panels 6in washout tips reduces drag Because reduced drag lighter weight mod el altitude gained power has improved 00 downthrust 10 left thrust model neutral easy trim designed increase acceleration altitude obtainable four-second engine run better chances making 2-minute max Construction say least construc tion very unusual X-frame adds tremendous rigidity judicious use carbon fiber materials provides light ness carbon fiber rod easy cut handle has no slivers use elec tricians combination stripper/cutter tool just put 4-40 bolt cutter hole shears carbon fiber off cleanly Carbon fiber sands files readily 007-in laminate unidirectional very strong dimensionally stable lengthwise very easily split across grain well easiest way cut snip desired width strip length needed rub fingers along edges because plywood can pick up slivers Cyanoacrylate CyA glues work fine epoxy heavier also good Since CyA attracts absorbs fuel-oil mix use make sure dont use around firewall fuel tank Use epoxy wherever glue joint could exposed fuel Wing Use two straightedges over plans guides leading edge LE trailing edge TE make sure straight use in alumi num strips builder supply Drill small holes strips small brads nail building board Using pins angle pin LE TE against straightedges Position bottom spar hold place crossed pins weights Glue ribs place making sure dihedral polyhedral ribs Left As done wing center section stab pinned position instaiiation CF cap strips Right Once giue cures CF strips top stabiiizer fiipped over squared up support biocks CF cap strips added bottom October 1987 77 correct respective angles Fit glue webbing carbon fiber cap strips place grain webbing parallel bottom Leave top webbing little heavy sanded flush ribs Note method carbon fiber cap strips will slightly above surface ribs can inset flush wish have done both ways have found insetting lot work little compensating ad vantage other neatness Careftilly sand tops webbing flush ribs mark tops rib5 very soft charcoal pencil able tell sandpaper has cut down ribs Cut slots spar turbulator spars webbing glue place Keeping carbon fiber cap strips centered approximately glue place top webbing Note Make sure panel perfectly flat blocked up warp want Once cap strips glued webbing impossible change panel structure Turn panel over block up LE TE panel either flat warp want Glue bottom carbon fiber cap strips place Now run bead fillet slow-set CyA along webbing cap strips hit accelerator very important step dont eliminate use fillet both sides webbing top bottom wing side stab Fit glue main spar webbing Verti cal grain OK necessary Complete wing panels fashion Before joining panels carefully cut slot dihedral polyhedral ribs between main spars plywood brace/webbing Line up block up main wing panel its matching tip panel Carefully fit plywood brace/webbing between main spars until nice easy fitno binding anywhere will have remove replace panel panels lined up blocked up spot-glue brace/webbing main panel Now can slide panels apart apply glue very slow-set CyA works slide back together allow set lined-up blocked-up position Assem ble entire wing fashion Add LE TE dihedral poly hedral braces shown built up carbon fiber tow carbon fiber rope epoxy find Hobby Poxy #2 works very well wets tow better has longer working life also longer curing tune Cut slots braces nothing fussy cover slots bottom wing heavy masking tape Put light layer epoxy bottom slot K K 133~3333 333s3I 3- 3 rr4h1 53 3-33333333333 33-33 33333 1 right tape Now take small bundle carbon fiber tow approximately V16-in diameter spread evenly bot tom slot Add another layer epoxy layer tow until slot filled Build top up little sanding after cured braces much stronger plywood Glue fiberglass reinforcements shown gussets centerline Cut Above DT ViT setup Note gussets construction particulars arrangement ultra-light well suited models short nose moment Left retaining cable atab preventa DTing up past approximately 45 Set DT fuse short flights trimming 78 Model Aviation 7 fuselage assembled carbon fiber rod Warren-truss type construction lightweight strong super rigid front end 01 tuselage wltn ins ouncneads place Thetis bulkheads will removed after slot cut top deck CF rod best cut wire strippers shown Full-Size Plans Available. See Page 188 EPT $rQE ____________________________I G,7 5D 4seC S 45 3/4-in squares carbon fiber mat spray side lightly 3M 77 contact glue Before glue dry wrap squares around LE TE ribs Squeeze together gently tear apart hit penetrating CyA method makes very strong joint despite mini mal glue wood area now have wing very light very strong rigid enough lightest flexible iron-on plastics Stab Fin stab construction same wingjust keep light As wing stab construction making fins also involves unconven tional methods Glue carbon fiber rods gussets together outline three sides no base Block up outline correct height glue base ribs webbing place Sand tapered symmetrical shape Add carbon fiber cap strips both sides webbing outline same blocks Fuselage Make sides first Set up straightedges using same method wing pin down longerons Fit glue verticals diagonals Add front side balsa panels sure make right left side right side left side diagonals also different Fit glue front carbon fiber longeron doublers Without changing straightedges stand sides up top edges down Fit crosspieces make top bottom pieces exactly same length glue both go along An alternative method finish top first turn over finish bottom use blocks cold rolled steel 1 x help keep everything square Add deck fin Fit glue diagonals go Fit glue top front deck pylon slot Laminate fit front bulitheads Make sure will right height bottom deck before gluing place Par tially cut pylon slot center bulkhead different Leave small ties near top bottom removed later before gluing place Fit glue bottom deck Continued page 172 October 1987 79 45 CCSCSCSSC bare-bones struciurs snows ins ui construction X-oeII structure provides Biock up perimeter fin Instali cap strips place secure smaii weight 4 gotta borrow glow borrow 4 besi OPS GLOW PLUGS Are Available Local Hobby Shop Parts People Comfeeto% %uo44 PO Box 26247 Orleans LA 70186 0-535-2568 Whitehead pre-Wright flight controversy heating up abetted continuing efforts dedicated group aero-historians crafts men up Fairfield CT Gustave Whitehead may have beaten Wil Orv air couple years folks have built replica No 21 Whitehead machine first flew sum mer last year will probably have further test flown time reading Flights up 330 ft length altitudes up five feet have far proven craft airworthy controllable using throttles No 21 two props remember Testing will enter new phase Whitehead engines can replicated installed replace present ultralight-type engines interesting sidelight replicas flights has still-air takeoff capabilities ship did take off fly still air will recall original Wright flier capable taking off still air under its own power required 27-mph head wind Kittyhawk catapult Dayton Whitehead two 10-horsepower engines opposed Wrights single 12-horsepower also another engine connected front wheels get up takeoff speed Remember horsepower ratings back days gave low-rpm torquea fact dis covered replica builders film Magnificent Men Flying Machines problems getting air modern high-revving engines double horsepower originals Bill ODwyer almost single-handedly kept Whitehead inquiry going over past 25 years says should watch 60 Minutes October Americans will get exposure Whitehead flights first time Continuing subject dummy engines interesting approach subject suggested Gene Pierre Princeton NJ manufac tures nifty fake fins wrap around partial cylinders smoothing piece aluminum foil flat clean surface using edge flat rubber eraser next places foil dull-sideup over file has clean undamaged parallel teeth uses flat single-cut file about inch wide has about nine inches toothed area rubs foil end eraser direction files tooth ridges After removing foil file Gene paints foil dull black Floquil model railroad paint allows itto dry lightly sands direction ridges may require two coats idea clean off just high parts leave black paint grooves cuts strips finished product 900 lines about V-in wide glues balsa dummy cylinders using medium CyA glue sample sent quite striking may just right next Peanut project Applications planes larger Peanuts can done simple expedient cutting some strips thin plastic credit cards about right width fins desired Strips about inch long t-in wide good glue stack alternating edges about V16 lower Thicker strips doubled strips can used between fin pieces level side strips effect have made own file such Gene uses different spacings between fins different fin widths Some practice getting just right depth impression foil using bigger sizes necessary foil cheap get grooves little too deep can pull little flatter after painting sanding theyll wrap around dummy cylinder easily Finally planned pil grimage Southern California Flightmasters Annual September should advised event has put off until December 56 1987 Events will include Rubber AMA Scale Gas AMA Scale Peanut Scale Jumbo Scale Multi-Engine Scale FF Jet Scale will banquet Saturday night following Scale judging flying set new field near March AFB Sunday Drop SASE details Until next time keep using wooden props bend yer crankshaft crash Bill Warner 423-C San Vicente Blvd Santa Monica CA 90402 Ex-Cels/Dunlop Continued page 79 Remove fuselage board fit glue carbon fiber X bulkheads part guaranteed try patience hang Now punch out -in-dia discs carbon fiber mat Lightly spray side 3M 77 contact glue before glue dry fold around joints Continued page 174 172 Model Aviation oldr perfectly proportionecz modeling Curtiss Robin 049 Engines -Channel R/C 41 Wingspan Electric Power Optional 82295 0 rO3 Very ten full soale aircraft ideally suited model flight appealing old Curtiss Robin born spruce lines age beaatrfally proportioned rubber electric glow engines Easy fan build trainer-like performance Flylne Models Catalog hOe Phone 17031 273-9593 INE MODELS INC PO Box 2138 FaIrfax VirgInIa 22031 USA Folding INTERCEPTOR Ready Fly $695 U-build Kit $495 Note Please add $3 P & H lst3 models. Add 10 % price foe additional modal AmedtAIUA~P AIRCRAFT COM PAN P0 Box 68132 Portland OR 97268 NOWA 30% Size VA ILA BLE Standoff Scale Extra 230 Kits199 new scaleetyle cowl plus $14 shipping 87 Wingspan 150 sq Wing Area Power 038 G38 ST2SOO ST3000 Also Avallahiet 1/3 Scale Kit $19995 plus $14 shipping 1/4 Scale Kit $16995 pius $8 shipping cash MO -VISA Mc ceilified check RIC EX1R4S 712-943-4102 RRI Box 283 Sergeant Bluff IA 51054 diagonals come together Hit pene trating CyA Install A2 ply timer plate blind nuts timer Dont forget install whatever dethermalizer DT hardware auto con trol setups going use proper phase construction Accurately cut pylon slot top deck remove ties bulk heads Note slot made long can made longer adjust center-ofgravity positioning Install cheeks carve shape Laminate add blind nuts install firewall Install stab platform incidence block VTO vertical takeoft peg Laminate build pylon wing platform inset carbon fiber strips both pylon platform flush makes neater job Fit pylon fuselage making sure angle attack correct Covering can use covering ma terial desire worries about structural rigidity lightest strongest rigid construction ever lightest flexible ironon plastics acceptable use Micafilm light strong difficult handle Heres method rear fuselage stab fin wing tips use clear lightestweight Micafilm main wing pan els covered stronger heavier white film Use 3M 77 contact spray Balsarite thinned 60% glue 40% thin ner Put two coats thinned Balsarite coat 3M 77 spray surfaces will contact covering except carbon fiber cap strips Cover bottom first Securely adhere cover wing outline Shrink cover gently low heat Trim outline go over glue contact line inside carbon fiber rods penetrating CyA too much no accelerator Cover top using -in-minimum overlaps Use 3M 77 spray two coats thinned Balsarite overlaps Shrink top gently low heat Now hit edges overlaps penetrating CyAand again no accelerator Shrink completely high heat top bottom Check remove undesired warps Now run iron low heat over surface contacts covering ribs sparsbut carbon fiber cap strips way to slowly run iron over small contact area rub firmly finger until cools set Dont burn fingers After completing step go over entire surface high heat check warps locks covering up tight everywhere easier patch outline wing stab fluorescent orange paint its exceptional visibility Clean area painted dope thinner better adhesion After orange paint sprayed apply coat Super Poxy over Center-of-gravity CG Before finishing front end assemble parts hard ware modeland means thing safe side add about two grams weight rear Now shift pylon forward backward case may indicated CGabout 66% 69% model becomes unstable Mter disassembly glue pylon position Follow own favorite time-proven method finish front end use light weight fiberglass tissue nitrate dope Super Poxy Add decals AMA number nameplate etc assemble Make sure wing exactly 900 key Note puzzling power patterns high-speed models can tributed wing perfectly lined up especially true very hot model Recheck CG Hying Check out systems ground engine running use pacifier fuel system pressure pinch-off fuel cutoff very close prox imity pinch-off venturi provides very quick positive shutoff no danger leaning out blowing plug As result plugs last longer can consistently run higher nitro could old flood-off system first flights 40% nitro 3- 3-second run quick DT four five seconds use rudder tab adjust incidence block control power pattern ideal pattern just about vertical slight twist right looks good gradually increase engine run about second time adjust Whenthe model can hold power pattern seven seconds longer test adjust variable incidence tail VIT glide use stab tilt glide circle seven-second engine run 15-to 20-second glide DT should keep model out trouble Once glide has adjusted increase fuel 50% nitro start over pattern 3-to 3-second engine run adjust etc time nitro percent fuel increased now have model super-light superstrong very competitive Handle TLC see flyoffs Sources carbon fiber material 1 Bob Violett 1373 Citrus Rd Winter Springs FL 32708 050-dia rod mat rope laminates 2 Twinn-K Inc PO Box 31228 Indian apolis IN 46231 070-dia rod laminates 3 Jim Bradley 1337 Pine Sap Ct Orlando FL 32817 060-dia rod mat laminates 4 Aerospace Composite Products PO Box 16621 Irvine CA 92714 050- 060- 070dia rods mat rope laminates Indoor Champs/Linstrum Continued page 82 built magnificent 1909 Aerodrome Silver Dart mentioned earlier first Canadian-designed aircraft fly canard pusher configuration model reminiscent Wright flyer Jeurgen MAAC member protege Scale expert Ken Groves mechanical engineering student University Waterloo Toronto Jack Humphries sug gested build researched model finding information Hammonds Sport Era covers pioneering types modeler since 1980 Jeurgen devoted over month building-time gem Complete wire bracing controls museum qualityyet has flight times over 30 sec Another up-and-coming Scale flier 24year-old Kevin Smith Ft Lauderdale FL labored long night Continued page 176 174 Model Aviation
Edition: Model Aviation - 1987/10
Page Numbers: 76, 77, 78, 79, 172, 174
Edition: Model Aviation - 1987/10
Page Numbers: 76, 77, 78, 79, 172, 174
Top The family portrait Theyve successful too capturing wins 1/2A A-B C-D classes Free Flight Left author prepares fire up winning flight Class event 1986 Nats Lake Charles Right get moat out short engine runs allowed imperative get weight low possible translates carbon fiber because little else market can match its strength weight ratio 76 Model Aviation Its always type construction plus type material used determined strength given structure both sophisticated model have expect superior results THE PUN its name no idle boast Ex-Cels high achiever indeed stateof-the-art model capable meeting challenge new Category III flyoff rules Although its named series Above main wing panel pinned position addition carbon fiber CF cap strips Above right wing tip biocked up warped position 1/16-in washout giuing CF caps strips Note easy-does-it jig instaliing poiyhedrai rib correct angie Right front end sports very iight Tomy timer trips fuei pinch off unit iocated ciose venturi troubie-free piumbing very attractive Magnaiite iogo avaiiabie Bob Vioiett modeis carbon fiber X-cells glued together form light strong rigid structure like implied salute performs too design am indebted Bob Bill Hunter well number others ideas have used elaborated upon Parts finished Ex-Cels re semble versions couldnt have done However good second look will show Ex-Cels has undergone evolutionary stages Using very unorthodox construction methods materials experimented until satis fied Id made necessary changes design parameters establish near-opti mum performance Fin area increased control wandering tendency power variable incidence tail plane added optimum glide adjustment airfoil changed 9% wing area increased wing taper improved overall drag re duced still maintaining actual lift characteristics wing changes along ultra-light construction have enhanced glide Because reduced drag lighter weight model altitude gained power has improved ultra-light tail feathers have made feasible lengthen tail moment nose has shortened adding stability power wing built no warps main panels 6in washout tips reduces drag Because reduced drag lighter weight mod el altitude gained power has improved 00 downthrust 10 left thrust model neutral easy trim designed increase acceleration altitude obtainable four-second engine run better chances making 2-minute max Construction say least construc tion very unusual X-frame adds tremendous rigidity judicious use carbon fiber materials provides light ness carbon fiber rod easy cut handle has no slivers use elec tricians combination stripper/cutter tool just put 4-40 bolt cutter hole shears carbon fiber off cleanly Carbon fiber sands files readily 007-in laminate unidirectional very strong dimensionally stable lengthwise very easily split across grain well easiest way cut snip desired width strip length needed rub fingers along edges because plywood can pick up slivers Cyanoacrylate CyA glues work fine epoxy heavier also good Since CyA attracts absorbs fuel-oil mix use make sure dont use around firewall fuel tank Use epoxy wherever glue joint could exposed fuel Wing Use two straightedges over plans guides leading edge LE trailing edge TE make sure straight use in alumi num strips builder supply Drill small holes strips small brads nail building board Using pins angle pin LE TE against straightedges Position bottom spar hold place crossed pins weights Glue ribs place making sure dihedral polyhedral ribs Left As done wing center section stab pinned position instaiiation CF cap strips Right Once giue cures CF strips top stabiiizer fiipped over squared up support biocks CF cap strips added bottom October 1987 77 correct respective angles Fit glue webbing carbon fiber cap strips place grain webbing parallel bottom Leave top webbing little heavy sanded flush ribs Note method carbon fiber cap strips will slightly above surface ribs can inset flush wish have done both ways have found insetting lot work little compensating ad vantage other neatness Careftilly sand tops webbing flush ribs mark tops rib5 very soft charcoal pencil able tell sandpaper has cut down ribs Cut slots spar turbulator spars webbing glue place Keeping carbon fiber cap strips centered approximately glue place top webbing Note Make sure panel perfectly flat blocked up warp want Once cap strips glued webbing impossible change panel structure Turn panel over block up LE TE panel either flat warp want Glue bottom carbon fiber cap strips place Now run bead fillet slow-set CyA along webbing cap strips hit accelerator very important step dont eliminate use fillet both sides webbing top bottom wing side stab Fit glue main spar webbing Verti cal grain OK necessary Complete wing panels fashion Before joining panels carefully cut slot dihedral polyhedral ribs between main spars plywood brace/webbing Line up block up main wing panel its matching tip panel Carefully fit plywood brace/webbing between main spars until nice easy fitno binding anywhere will have remove replace panel panels lined up blocked up spot-glue brace/webbing main panel Now can slide panels apart apply glue very slow-set CyA works slide back together allow set lined-up blocked-up position Assem ble entire wing fashion Add LE TE dihedral poly hedral braces shown built up carbon fiber tow carbon fiber rope epoxy find Hobby Poxy #2 works very well wets tow better has longer working life also longer curing tune Cut slots braces nothing fussy cover slots bottom wing heavy masking tape Put light layer epoxy bottom slot K K 133~3333 333s3I 3- 3 rr4h1 53 3-33333333333 33-33 33333 1 right tape Now take small bundle carbon fiber tow approximately V16-in diameter spread evenly bot tom slot Add another layer epoxy layer tow until slot filled Build top up little sanding after cured braces much stronger plywood Glue fiberglass reinforcements shown gussets centerline Cut Above DT ViT setup Note gussets construction particulars arrangement ultra-light well suited models short nose moment Left retaining cable atab preventa DTing up past approximately 45 Set DT fuse short flights trimming 78 Model Aviation 7 fuselage assembled carbon fiber rod Warren-truss type construction lightweight strong super rigid front end 01 tuselage wltn ins ouncneads place Thetis bulkheads will removed after slot cut top deck CF rod best cut wire strippers shown Full-Size Plans Available. See Page 188 EPT $rQE ____________________________I G,7 5D 4seC S 45 3/4-in squares carbon fiber mat spray side lightly 3M 77 contact glue Before glue dry wrap squares around LE TE ribs Squeeze together gently tear apart hit penetrating CyA method makes very strong joint despite mini mal glue wood area now have wing very light very strong rigid enough lightest flexible iron-on plastics Stab Fin stab construction same wingjust keep light As wing stab construction making fins also involves unconven tional methods Glue carbon fiber rods gussets together outline three sides no base Block up outline correct height glue base ribs webbing place Sand tapered symmetrical shape Add carbon fiber cap strips both sides webbing outline same blocks Fuselage Make sides first Set up straightedges using same method wing pin down longerons Fit glue verticals diagonals Add front side balsa panels sure make right left side right side left side diagonals also different Fit glue front carbon fiber longeron doublers Without changing straightedges stand sides up top edges down Fit crosspieces make top bottom pieces exactly same length glue both go along An alternative method finish top first turn over finish bottom use blocks cold rolled steel 1 x help keep everything square Add deck fin Fit glue diagonals go Fit glue top front deck pylon slot Laminate fit front bulitheads Make sure will right height bottom deck before gluing place Par tially cut pylon slot center bulkhead different Leave small ties near top bottom removed later before gluing place Fit glue bottom deck Continued page 172 October 1987 79 45 CCSCSCSSC bare-bones struciurs snows ins ui construction X-oeII structure provides Biock up perimeter fin Instali cap strips place secure smaii weight 4 gotta borrow glow borrow 4 besi OPS GLOW PLUGS Are Available Local Hobby Shop Parts People Comfeeto% %uo44 PO Box 26247 Orleans LA 70186 0-535-2568 Whitehead pre-Wright flight controversy heating up abetted continuing efforts dedicated group aero-historians crafts men up Fairfield CT Gustave Whitehead may have beaten Wil Orv air couple years folks have built replica No 21 Whitehead machine first flew sum mer last year will probably have further test flown time reading Flights up 330 ft length altitudes up five feet have far proven craft airworthy controllable using throttles No 21 two props remember Testing will enter new phase Whitehead engines can replicated installed replace present ultralight-type engines interesting sidelight replicas flights has still-air takeoff capabilities ship did take off fly still air will recall original Wright flier capable taking off still air under its own power required 27-mph head wind Kittyhawk catapult Dayton Whitehead two 10-horsepower engines opposed Wrights single 12-horsepower also another engine connected front wheels get up takeoff speed Remember horsepower ratings back days gave low-rpm torquea fact dis covered replica builders film Magnificent Men Flying Machines problems getting air modern high-revving engines double horsepower originals Bill ODwyer almost single-handedly kept Whitehead inquiry going over past 25 years says should watch 60 Minutes October Americans will get exposure Whitehead flights first time Continuing subject dummy engines interesting approach subject suggested Gene Pierre Princeton NJ manufac tures nifty fake fins wrap around partial cylinders smoothing piece aluminum foil flat clean surface using edge flat rubber eraser next places foil dull-sideup over file has clean undamaged parallel teeth uses flat single-cut file about inch wide has about nine inches toothed area rubs foil end eraser direction files tooth ridges After removing foil file Gene paints foil dull black Floquil model railroad paint allows itto dry lightly sands direction ridges may require two coats idea clean off just high parts leave black paint grooves cuts strips finished product 900 lines about V-in wide glues balsa dummy cylinders using medium CyA glue sample sent quite striking may just right next Peanut project Applications planes larger Peanuts can done simple expedient cutting some strips thin plastic credit cards about right width fins desired Strips about inch long t-in wide good glue stack alternating edges about V16 lower Thicker strips doubled strips can used between fin pieces level side strips effect have made own file such Gene uses different spacings between fins different fin widths Some practice getting just right depth impression foil using bigger sizes necessary foil cheap get grooves little too deep can pull little flatter after painting sanding theyll wrap around dummy cylinder easily Finally planned pil grimage Southern California Flightmasters Annual September should advised event has put off until December 56 1987 Events will include Rubber AMA Scale Gas AMA Scale Peanut Scale Jumbo Scale Multi-Engine Scale FF Jet Scale will banquet Saturday night following Scale judging flying set new field near March AFB Sunday Drop SASE details Until next time keep using wooden props bend yer crankshaft crash Bill Warner 423-C San Vicente Blvd Santa Monica CA 90402 Ex-Cels/Dunlop Continued page 79 Remove fuselage board fit glue carbon fiber X bulkheads part guaranteed try patience hang Now punch out -in-dia discs carbon fiber mat Lightly spray side 3M 77 contact glue before glue dry fold around joints Continued page 174 172 Model Aviation oldr perfectly proportionecz modeling Curtiss Robin 049 Engines -Channel R/C 41 Wingspan Electric Power Optional 82295 0 rO3 Very ten full soale aircraft ideally suited model flight appealing old Curtiss Robin born spruce lines age beaatrfally proportioned rubber electric glow engines Easy fan build trainer-like performance Flylne Models Catalog hOe Phone 17031 273-9593 INE MODELS INC PO Box 2138 FaIrfax VirgInIa 22031 USA Folding INTERCEPTOR Ready Fly $695 U-build Kit $495 Note Please add $3 P & H lst3 models. Add 10 % price foe additional modal AmedtAIUA~P AIRCRAFT COM PAN P0 Box 68132 Portland OR 97268 NOWA 30% Size VA ILA BLE Standoff Scale Extra 230 Kits199 new scaleetyle cowl plus $14 shipping 87 Wingspan 150 sq Wing Area Power 038 G38 ST2SOO ST3000 Also Avallahiet 1/3 Scale Kit $19995 plus $14 shipping 1/4 Scale Kit $16995 pius $8 shipping cash MO -VISA Mc ceilified check RIC EX1R4S 712-943-4102 RRI Box 283 Sergeant Bluff IA 51054 diagonals come together Hit pene trating CyA Install A2 ply timer plate blind nuts timer Dont forget install whatever dethermalizer DT hardware auto con trol setups going use proper phase construction Accurately cut pylon slot top deck remove ties bulk heads Note slot made long can made longer adjust center-ofgravity positioning Install cheeks carve shape Laminate add blind nuts install firewall Install stab platform incidence block VTO vertical takeoft peg Laminate build pylon wing platform inset carbon fiber strips both pylon platform flush makes neater job Fit pylon fuselage making sure angle attack correct Covering can use covering ma terial desire worries about structural rigidity lightest strongest rigid construction ever lightest flexible ironon plastics acceptable use Micafilm light strong difficult handle Heres method rear fuselage stab fin wing tips use clear lightestweight Micafilm main wing pan els covered stronger heavier white film Use 3M 77 contact spray Balsarite thinned 60% glue 40% thin ner Put two coats thinned Balsarite coat 3M 77 spray surfaces will contact covering except carbon fiber cap strips Cover bottom first Securely adhere cover wing outline Shrink cover gently low heat Trim outline go over glue contact line inside carbon fiber rods penetrating CyA too much no accelerator Cover top using -in-minimum overlaps Use 3M 77 spray two coats thinned Balsarite overlaps Shrink top gently low heat Now hit edges overlaps penetrating CyAand again no accelerator Shrink completely high heat top bottom Check remove undesired warps Now run iron low heat over surface contacts covering ribs sparsbut carbon fiber cap strips way to slowly run iron over small contact area rub firmly finger until cools set Dont burn fingers After completing step go over entire surface high heat check warps locks covering up tight everywhere easier patch outline wing stab fluorescent orange paint its exceptional visibility Clean area painted dope thinner better adhesion After orange paint sprayed apply coat Super Poxy over Center-of-gravity CG Before finishing front end assemble parts hard ware modeland means thing safe side add about two grams weight rear Now shift pylon forward backward case may indicated CGabout 66% 69% model becomes unstable Mter disassembly glue pylon position Follow own favorite time-proven method finish front end use light weight fiberglass tissue nitrate dope Super Poxy Add decals AMA number nameplate etc assemble Make sure wing exactly 900 key Note puzzling power patterns high-speed models can tributed wing perfectly lined up especially true very hot model Recheck CG Hying Check out systems ground engine running use pacifier fuel system pressure pinch-off fuel cutoff very close prox imity pinch-off venturi provides very quick positive shutoff no danger leaning out blowing plug As result plugs last longer can consistently run higher nitro could old flood-off system first flights 40% nitro 3- 3-second run quick DT four five seconds use rudder tab adjust incidence block control power pattern ideal pattern just about vertical slight twist right looks good gradually increase engine run about second time adjust Whenthe model can hold power pattern seven seconds longer test adjust variable incidence tail VIT glide use stab tilt glide circle seven-second engine run 15-to 20-second glide DT should keep model out trouble Once glide has adjusted increase fuel 50% nitro start over pattern 3-to 3-second engine run adjust etc time nitro percent fuel increased now have model super-light superstrong very competitive Handle TLC see flyoffs Sources carbon fiber material 1 Bob Violett 1373 Citrus Rd Winter Springs FL 32708 050-dia rod mat rope laminates 2 Twinn-K Inc PO Box 31228 Indian apolis IN 46231 070-dia rod laminates 3 Jim Bradley 1337 Pine Sap Ct Orlando FL 32817 060-dia rod mat laminates 4 Aerospace Composite Products PO Box 16621 Irvine CA 92714 050- 060- 070dia rods mat rope laminates Indoor Champs/Linstrum Continued page 82 built magnificent 1909 Aerodrome Silver Dart mentioned earlier first Canadian-designed aircraft fly canard pusher configuration model reminiscent Wright flyer Jeurgen MAAC member protege Scale expert Ken Groves mechanical engineering student University Waterloo Toronto Jack Humphries sug gested build researched model finding information Hammonds Sport Era covers pioneering types modeler since 1980 Jeurgen devoted over month building-time gem Complete wire bracing controls museum qualityyet has flight times over 30 sec Another up-and-coming Scale flier 24year-old Kevin Smith Ft Lauderdale FL labored long night Continued page 176 174 Model Aviation
Edition: Model Aviation - 1987/10
Page Numbers: 76, 77, 78, 79, 172, 174
Top The family portrait Theyve successful too capturing wins 1/2A A-B C-D classes Free Flight Left author prepares fire up winning flight Class event 1986 Nats Lake Charles Right get moat out short engine runs allowed imperative get weight low possible translates carbon fiber because little else market can match its strength weight ratio 76 Model Aviation Its always type construction plus type material used determined strength given structure both sophisticated model have expect superior results THE PUN its name no idle boast Ex-Cels high achiever indeed stateof-the-art model capable meeting challenge new Category III flyoff rules Although its named series Above main wing panel pinned position addition carbon fiber CF cap strips Above right wing tip biocked up warped position 1/16-in washout giuing CF caps strips Note easy-does-it jig instaliing poiyhedrai rib correct angie Right front end sports very iight Tomy timer trips fuei pinch off unit iocated ciose venturi troubie-free piumbing very attractive Magnaiite iogo avaiiabie Bob Vioiett modeis carbon fiber X-cells glued together form light strong rigid structure like implied salute performs too design am indebted Bob Bill Hunter well number others ideas have used elaborated upon Parts finished Ex-Cels re semble versions couldnt have done However good second look will show Ex-Cels has undergone evolutionary stages Using very unorthodox construction methods materials experimented until satis fied Id made necessary changes design parameters establish near-opti mum performance Fin area increased control wandering tendency power variable incidence tail plane added optimum glide adjustment airfoil changed 9% wing area increased wing taper improved overall drag re duced still maintaining actual lift characteristics wing changes along ultra-light construction have enhanced glide Because reduced drag lighter weight model altitude gained power has improved ultra-light tail feathers have made feasible lengthen tail moment nose has shortened adding stability power wing built no warps main panels 6in washout tips reduces drag Because reduced drag lighter weight mod el altitude gained power has improved 00 downthrust 10 left thrust model neutral easy trim designed increase acceleration altitude obtainable four-second engine run better chances making 2-minute max Construction say least construc tion very unusual X-frame adds tremendous rigidity judicious use carbon fiber materials provides light ness carbon fiber rod easy cut handle has no slivers use elec tricians combination stripper/cutter tool just put 4-40 bolt cutter hole shears carbon fiber off cleanly Carbon fiber sands files readily 007-in laminate unidirectional very strong dimensionally stable lengthwise very easily split across grain well easiest way cut snip desired width strip length needed rub fingers along edges because plywood can pick up slivers Cyanoacrylate CyA glues work fine epoxy heavier also good Since CyA attracts absorbs fuel-oil mix use make sure dont use around firewall fuel tank Use epoxy wherever glue joint could exposed fuel Wing Use two straightedges over plans guides leading edge LE trailing edge TE make sure straight use in alumi num strips builder supply Drill small holes strips small brads nail building board Using pins angle pin LE TE against straightedges Position bottom spar hold place crossed pins weights Glue ribs place making sure dihedral polyhedral ribs Left As done wing center section stab pinned position instaiiation CF cap strips Right Once giue cures CF strips top stabiiizer fiipped over squared up support biocks CF cap strips added bottom October 1987 77 correct respective angles Fit glue webbing carbon fiber cap strips place grain webbing parallel bottom Leave top webbing little heavy sanded flush ribs Note method carbon fiber cap strips will slightly above surface ribs can inset flush wish have done both ways have found insetting lot work little compensating ad vantage other neatness Careftilly sand tops webbing flush ribs mark tops rib5 very soft charcoal pencil able tell sandpaper has cut down ribs Cut slots spar turbulator spars webbing glue place Keeping carbon fiber cap strips centered approximately glue place top webbing Note Make sure panel perfectly flat blocked up warp want Once cap strips glued webbing impossible change panel structure Turn panel over block up LE TE panel either flat warp want Glue bottom carbon fiber cap strips place Now run bead fillet slow-set CyA along webbing cap strips hit accelerator very important step dont eliminate use fillet both sides webbing top bottom wing side stab Fit glue main spar webbing Verti cal grain OK necessary Complete wing panels fashion Before joining panels carefully cut slot dihedral polyhedral ribs between main spars plywood brace/webbing Line up block up main wing panel its matching tip panel Carefully fit plywood brace/webbing between main spars until nice easy fitno binding anywhere will have remove replace panel panels lined up blocked up spot-glue brace/webbing main panel Now can slide panels apart apply glue very slow-set CyA works slide back together allow set lined-up blocked-up position Assem ble entire wing fashion Add LE TE dihedral poly hedral braces shown built up carbon fiber tow carbon fiber rope epoxy find Hobby Poxy #2 works very well wets tow better has longer working life also longer curing tune Cut slots braces nothing fussy cover slots bottom wing heavy masking tape Put light layer epoxy bottom slot K K 133~3333 333s3I 3- 3 rr4h1 53 3-33333333333 33-33 33333 1 right tape Now take small bundle carbon fiber tow approximately V16-in diameter spread evenly bot tom slot Add another layer epoxy layer tow until slot filled Build top up little sanding after cured braces much stronger plywood Glue fiberglass reinforcements shown gussets centerline Cut Above DT ViT setup Note gussets construction particulars arrangement ultra-light well suited models short nose moment Left retaining cable atab preventa DTing up past approximately 45 Set DT fuse short flights trimming 78 Model Aviation 7 fuselage assembled carbon fiber rod Warren-truss type construction lightweight strong super rigid front end 01 tuselage wltn ins ouncneads place Thetis bulkheads will removed after slot cut top deck CF rod best cut wire strippers shown Full-Size Plans Available. See Page 188 EPT $rQE ____________________________I G,7 5D 4seC S 45 3/4-in squares carbon fiber mat spray side lightly 3M 77 contact glue Before glue dry wrap squares around LE TE ribs Squeeze together gently tear apart hit penetrating CyA method makes very strong joint despite mini mal glue wood area now have wing very light very strong rigid enough lightest flexible iron-on plastics Stab Fin stab construction same wingjust keep light As wing stab construction making fins also involves unconven tional methods Glue carbon fiber rods gussets together outline three sides no base Block up outline correct height glue base ribs webbing place Sand tapered symmetrical shape Add carbon fiber cap strips both sides webbing outline same blocks Fuselage Make sides first Set up straightedges using same method wing pin down longerons Fit glue verticals diagonals Add front side balsa panels sure make right left side right side left side diagonals also different Fit glue front carbon fiber longeron doublers Without changing straightedges stand sides up top edges down Fit crosspieces make top bottom pieces exactly same length glue both go along An alternative method finish top first turn over finish bottom use blocks cold rolled steel 1 x help keep everything square Add deck fin Fit glue diagonals go Fit glue top front deck pylon slot Laminate fit front bulitheads Make sure will right height bottom deck before gluing place Par tially cut pylon slot center bulkhead different Leave small ties near top bottom removed later before gluing place Fit glue bottom deck Continued page 172 October 1987 79 45 CCSCSCSSC bare-bones struciurs snows ins ui construction X-oeII structure provides Biock up perimeter fin Instali cap strips place secure smaii weight 4 gotta borrow glow borrow 4 besi OPS GLOW PLUGS Are Available Local Hobby Shop Parts People Comfeeto% %uo44 PO Box 26247 Orleans LA 70186 0-535-2568 Whitehead pre-Wright flight controversy heating up abetted continuing efforts dedicated group aero-historians crafts men up Fairfield CT Gustave Whitehead may have beaten Wil Orv air couple years folks have built replica No 21 Whitehead machine first flew sum mer last year will probably have further test flown time reading Flights up 330 ft length altitudes up five feet have far proven craft airworthy controllable using throttles No 21 two props remember Testing will enter new phase Whitehead engines can replicated installed replace present ultralight-type engines interesting sidelight replicas flights has still-air takeoff capabilities ship did take off fly still air will recall original Wright flier capable taking off still air under its own power required 27-mph head wind Kittyhawk catapult Dayton Whitehead two 10-horsepower engines opposed Wrights single 12-horsepower also another engine connected front wheels get up takeoff speed Remember horsepower ratings back days gave low-rpm torquea fact dis covered replica builders film Magnificent Men Flying Machines problems getting air modern high-revving engines double horsepower originals Bill ODwyer almost single-handedly kept Whitehead inquiry going over past 25 years says should watch 60 Minutes October Americans will get exposure Whitehead flights first time Continuing subject dummy engines interesting approach subject suggested Gene Pierre Princeton NJ manufac tures nifty fake fins wrap around partial cylinders smoothing piece aluminum foil flat clean surface using edge flat rubber eraser next places foil dull-sideup over file has clean undamaged parallel teeth uses flat single-cut file about inch wide has about nine inches toothed area rubs foil end eraser direction files tooth ridges After removing foil file Gene paints foil dull black Floquil model railroad paint allows itto dry lightly sands direction ridges may require two coats idea clean off just high parts leave black paint grooves cuts strips finished product 900 lines about V-in wide glues balsa dummy cylinders using medium CyA glue sample sent quite striking may just right next Peanut project Applications planes larger Peanuts can done simple expedient cutting some strips thin plastic credit cards about right width fins desired Strips about inch long t-in wide good glue stack alternating edges about V16 lower Thicker strips doubled strips can used between fin pieces level side strips effect have made own file such Gene uses different spacings between fins different fin widths Some practice getting just right depth impression foil using bigger sizes necessary foil cheap get grooves little too deep can pull little flatter after painting sanding theyll wrap around dummy cylinder easily Finally planned pil grimage Southern California Flightmasters Annual September should advised event has put off until December 56 1987 Events will include Rubber AMA Scale Gas AMA Scale Peanut Scale Jumbo Scale Multi-Engine Scale FF Jet Scale will banquet Saturday night following Scale judging flying set new field near March AFB Sunday Drop SASE details Until next time keep using wooden props bend yer crankshaft crash Bill Warner 423-C San Vicente Blvd Santa Monica CA 90402 Ex-Cels/Dunlop Continued page 79 Remove fuselage board fit glue carbon fiber X bulkheads part guaranteed try patience hang Now punch out -in-dia discs carbon fiber mat Lightly spray side 3M 77 contact glue before glue dry fold around joints Continued page 174 172 Model Aviation oldr perfectly proportionecz modeling Curtiss Robin 049 Engines -Channel R/C 41 Wingspan Electric Power Optional 82295 0 rO3 Very ten full soale aircraft ideally suited model flight appealing old Curtiss Robin born spruce lines age beaatrfally proportioned rubber electric glow engines Easy fan build trainer-like performance Flylne Models Catalog hOe Phone 17031 273-9593 INE MODELS INC PO Box 2138 FaIrfax VirgInIa 22031 USA Folding INTERCEPTOR Ready Fly $695 U-build Kit $495 Note Please add $3 P & H lst3 models. Add 10 % price foe additional modal AmedtAIUA~P AIRCRAFT COM PAN P0 Box 68132 Portland OR 97268 NOWA 30% Size VA ILA BLE Standoff Scale Extra 230 Kits199 new scaleetyle cowl plus $14 shipping 87 Wingspan 150 sq Wing Area Power 038 G38 ST2SOO ST3000 Also Avallahiet 1/3 Scale Kit $19995 plus $14 shipping 1/4 Scale Kit $16995 pius $8 shipping cash MO -VISA Mc ceilified check RIC EX1R4S 712-943-4102 RRI Box 283 Sergeant Bluff IA 51054 diagonals come together Hit pene trating CyA Install A2 ply timer plate blind nuts timer Dont forget install whatever dethermalizer DT hardware auto con trol setups going use proper phase construction Accurately cut pylon slot top deck remove ties bulk heads Note slot made long can made longer adjust center-ofgravity positioning Install cheeks carve shape Laminate add blind nuts install firewall Install stab platform incidence block VTO vertical takeoft peg Laminate build pylon wing platform inset carbon fiber strips both pylon platform flush makes neater job Fit pylon fuselage making sure angle attack correct Covering can use covering ma terial desire worries about structural rigidity lightest strongest rigid construction ever lightest flexible ironon plastics acceptable use Micafilm light strong difficult handle Heres method rear fuselage stab fin wing tips use clear lightestweight Micafilm main wing pan els covered stronger heavier white film Use 3M 77 contact spray Balsarite thinned 60% glue 40% thin ner Put two coats thinned Balsarite coat 3M 77 spray surfaces will contact covering except carbon fiber cap strips Cover bottom first Securely adhere cover wing outline Shrink cover gently low heat Trim outline go over glue contact line inside carbon fiber rods penetrating CyA too much no accelerator Cover top using -in-minimum overlaps Use 3M 77 spray two coats thinned Balsarite overlaps Shrink top gently low heat Now hit edges overlaps penetrating CyAand again no accelerator Shrink completely high heat top bottom Check remove undesired warps Now run iron low heat over surface contacts covering ribs sparsbut carbon fiber cap strips way to slowly run iron over small contact area rub firmly finger until cools set Dont burn fingers After completing step go over entire surface high heat check warps locks covering up tight everywhere easier patch outline wing stab fluorescent orange paint its exceptional visibility Clean area painted dope thinner better adhesion After orange paint sprayed apply coat Super Poxy over Center-of-gravity CG Before finishing front end assemble parts hard ware modeland means thing safe side add about two grams weight rear Now shift pylon forward backward case may indicated CGabout 66% 69% model becomes unstable Mter disassembly glue pylon position Follow own favorite time-proven method finish front end use light weight fiberglass tissue nitrate dope Super Poxy Add decals AMA number nameplate etc assemble Make sure wing exactly 900 key Note puzzling power patterns high-speed models can tributed wing perfectly lined up especially true very hot model Recheck CG Hying Check out systems ground engine running use pacifier fuel system pressure pinch-off fuel cutoff very close prox imity pinch-off venturi provides very quick positive shutoff no danger leaning out blowing plug As result plugs last longer can consistently run higher nitro could old flood-off system first flights 40% nitro 3- 3-second run quick DT four five seconds use rudder tab adjust incidence block control power pattern ideal pattern just about vertical slight twist right looks good gradually increase engine run about second time adjust Whenthe model can hold power pattern seven seconds longer test adjust variable incidence tail VIT glide use stab tilt glide circle seven-second engine run 15-to 20-second glide DT should keep model out trouble Once glide has adjusted increase fuel 50% nitro start over pattern 3-to 3-second engine run adjust etc time nitro percent fuel increased now have model super-light superstrong very competitive Handle TLC see flyoffs Sources carbon fiber material 1 Bob Violett 1373 Citrus Rd Winter Springs FL 32708 050-dia rod mat rope laminates 2 Twinn-K Inc PO Box 31228 Indian apolis IN 46231 070-dia rod laminates 3 Jim Bradley 1337 Pine Sap Ct Orlando FL 32817 060-dia rod mat laminates 4 Aerospace Composite Products PO Box 16621 Irvine CA 92714 050- 060- 070dia rods mat rope laminates Indoor Champs/Linstrum Continued page 82 built magnificent 1909 Aerodrome Silver Dart mentioned earlier first Canadian-designed aircraft fly canard pusher configuration model reminiscent Wright flyer Jeurgen MAAC member protege Scale expert Ken Groves mechanical engineering student University Waterloo Toronto Jack Humphries sug gested build researched model finding information Hammonds Sport Era covers pioneering types modeler since 1980 Jeurgen devoted over month building-time gem Complete wire bracing controls museum qualityyet has flight times over 30 sec Another up-and-coming Scale flier 24year-old Kevin Smith Ft Lauderdale FL labored long night Continued page 176 174 Model Aviation
Edition: Model Aviation - 1987/10
Page Numbers: 76, 77, 78, 79, 172, 174
Top The family portrait Theyve successful too capturing wins 1/2A A-B C-D classes Free Flight Left author prepares fire up winning flight Class event 1986 Nats Lake Charles Right get moat out short engine runs allowed imperative get weight low possible translates carbon fiber because little else market can match its strength weight ratio 76 Model Aviation Its always type construction plus type material used determined strength given structure both sophisticated model have expect superior results THE PUN its name no idle boast Ex-Cels high achiever indeed stateof-the-art model capable meeting challenge new Category III flyoff rules Although its named series Above main wing panel pinned position addition carbon fiber CF cap strips Above right wing tip biocked up warped position 1/16-in washout giuing CF caps strips Note easy-does-it jig instaliing poiyhedrai rib correct angie Right front end sports very iight Tomy timer trips fuei pinch off unit iocated ciose venturi troubie-free piumbing very attractive Magnaiite iogo avaiiabie Bob Vioiett modeis carbon fiber X-cells glued together form light strong rigid structure like implied salute performs too design am indebted Bob Bill Hunter well number others ideas have used elaborated upon Parts finished Ex-Cels re semble versions couldnt have done However good second look will show Ex-Cels has undergone evolutionary stages Using very unorthodox construction methods materials experimented until satis fied Id made necessary changes design parameters establish near-opti mum performance Fin area increased control wandering tendency power variable incidence tail plane added optimum glide adjustment airfoil changed 9% wing area increased wing taper improved overall drag re duced still maintaining actual lift characteristics wing changes along ultra-light construction have enhanced glide Because reduced drag lighter weight model altitude gained power has improved ultra-light tail feathers have made feasible lengthen tail moment nose has shortened adding stability power wing built no warps main panels 6in washout tips reduces drag Because reduced drag lighter weight mod el altitude gained power has improved 00 downthrust 10 left thrust model neutral easy trim designed increase acceleration altitude obtainable four-second engine run better chances making 2-minute max Construction say least construc tion very unusual X-frame adds tremendous rigidity judicious use carbon fiber materials provides light ness carbon fiber rod easy cut handle has no slivers use elec tricians combination stripper/cutter tool just put 4-40 bolt cutter hole shears carbon fiber off cleanly Carbon fiber sands files readily 007-in laminate unidirectional very strong dimensionally stable lengthwise very easily split across grain well easiest way cut snip desired width strip length needed rub fingers along edges because plywood can pick up slivers Cyanoacrylate CyA glues work fine epoxy heavier also good Since CyA attracts absorbs fuel-oil mix use make sure dont use around firewall fuel tank Use epoxy wherever glue joint could exposed fuel Wing Use two straightedges over plans guides leading edge LE trailing edge TE make sure straight use in alumi num strips builder supply Drill small holes strips small brads nail building board Using pins angle pin LE TE against straightedges Position bottom spar hold place crossed pins weights Glue ribs place making sure dihedral polyhedral ribs Left As done wing center section stab pinned position instaiiation CF cap strips Right Once giue cures CF strips top stabiiizer fiipped over squared up support biocks CF cap strips added bottom October 1987 77 correct respective angles Fit glue webbing carbon fiber cap strips place grain webbing parallel bottom Leave top webbing little heavy sanded flush ribs Note method carbon fiber cap strips will slightly above surface ribs can inset flush wish have done both ways have found insetting lot work little compensating ad vantage other neatness Careftilly sand tops webbing flush ribs mark tops rib5 very soft charcoal pencil able tell sandpaper has cut down ribs Cut slots spar turbulator spars webbing glue place Keeping carbon fiber cap strips centered approximately glue place top webbing Note Make sure panel perfectly flat blocked up warp want Once cap strips glued webbing impossible change panel structure Turn panel over block up LE TE panel either flat warp want Glue bottom carbon fiber cap strips place Now run bead fillet slow-set CyA along webbing cap strips hit accelerator very important step dont eliminate use fillet both sides webbing top bottom wing side stab Fit glue main spar webbing Verti cal grain OK necessary Complete wing panels fashion Before joining panels carefully cut slot dihedral polyhedral ribs between main spars plywood brace/webbing Line up block up main wing panel its matching tip panel Carefully fit plywood brace/webbing between main spars until nice easy fitno binding anywhere will have remove replace panel panels lined up blocked up spot-glue brace/webbing main panel Now can slide panels apart apply glue very slow-set CyA works slide back together allow set lined-up blocked-up position Assem ble entire wing fashion Add LE TE dihedral poly hedral braces shown built up carbon fiber tow carbon fiber rope epoxy find Hobby Poxy #2 works very well wets tow better has longer working life also longer curing tune Cut slots braces nothing fussy cover slots bottom wing heavy masking tape Put light layer epoxy bottom slot K K 133~3333 333s3I 3- 3 rr4h1 53 3-33333333333 33-33 33333 1 right tape Now take small bundle carbon fiber tow approximately V16-in diameter spread evenly bot tom slot Add another layer epoxy layer tow until slot filled Build top up little sanding after cured braces much stronger plywood Glue fiberglass reinforcements shown gussets centerline Cut Above DT ViT setup Note gussets construction particulars arrangement ultra-light well suited models short nose moment Left retaining cable atab preventa DTing up past approximately 45 Set DT fuse short flights trimming 78 Model Aviation 7 fuselage assembled carbon fiber rod Warren-truss type construction lightweight strong super rigid front end 01 tuselage wltn ins ouncneads place Thetis bulkheads will removed after slot cut top deck CF rod best cut wire strippers shown Full-Size Plans Available. See Page 188 EPT $rQE ____________________________I G,7 5D 4seC S 45 3/4-in squares carbon fiber mat spray side lightly 3M 77 contact glue Before glue dry wrap squares around LE TE ribs Squeeze together gently tear apart hit penetrating CyA method makes very strong joint despite mini mal glue wood area now have wing very light very strong rigid enough lightest flexible iron-on plastics Stab Fin stab construction same wingjust keep light As wing stab construction making fins also involves unconven tional methods Glue carbon fiber rods gussets together outline three sides no base Block up outline correct height glue base ribs webbing place Sand tapered symmetrical shape Add carbon fiber cap strips both sides webbing outline same blocks Fuselage Make sides first Set up straightedges using same method wing pin down longerons Fit glue verticals diagonals Add front side balsa panels sure make right left side right side left side diagonals also different Fit glue front carbon fiber longeron doublers Without changing straightedges stand sides up top edges down Fit crosspieces make top bottom pieces exactly same length glue both go along An alternative method finish top first turn over finish bottom use blocks cold rolled steel 1 x help keep everything square Add deck fin Fit glue diagonals go Fit glue top front deck pylon slot Laminate fit front bulitheads Make sure will right height bottom deck before gluing place Par tially cut pylon slot center bulkhead different Leave small ties near top bottom removed later before gluing place Fit glue bottom deck Continued page 172 October 1987 79 45 CCSCSCSSC bare-bones struciurs snows ins ui construction X-oeII structure provides Biock up perimeter fin Instali cap strips place secure smaii weight 4 gotta borrow glow borrow 4 besi OPS GLOW PLUGS Are Available Local Hobby Shop Parts People Comfeeto% %uo44 PO Box 26247 Orleans LA 70186 0-535-2568 Whitehead pre-Wright flight controversy heating up abetted continuing efforts dedicated group aero-historians crafts men up Fairfield CT Gustave Whitehead may have beaten Wil Orv air couple years folks have built replica No 21 Whitehead machine first flew sum mer last year will probably have further test flown time reading Flights up 330 ft length altitudes up five feet have far proven craft airworthy controllable using throttles No 21 two props remember Testing will enter new phase Whitehead engines can replicated installed replace present ultralight-type engines interesting sidelight replicas flights has still-air takeoff capabilities ship did take off fly still air will recall original Wright flier capable taking off still air under its own power required 27-mph head wind Kittyhawk catapult Dayton Whitehead two 10-horsepower engines opposed Wrights single 12-horsepower also another engine connected front wheels get up takeoff speed Remember horsepower ratings back days gave low-rpm torquea fact dis covered replica builders film Magnificent Men Flying Machines problems getting air modern high-revving engines double horsepower originals Bill ODwyer almost single-handedly kept Whitehead inquiry going over past 25 years says should watch 60 Minutes October Americans will get exposure Whitehead flights first time Continuing subject dummy engines interesting approach subject suggested Gene Pierre Princeton NJ manufac tures nifty fake fins wrap around partial cylinders smoothing piece aluminum foil flat clean surface using edge flat rubber eraser next places foil dull-sideup over file has clean undamaged parallel teeth uses flat single-cut file about inch wide has about nine inches toothed area rubs foil end eraser direction files tooth ridges After removing foil file Gene paints foil dull black Floquil model railroad paint allows itto dry lightly sands direction ridges may require two coats idea clean off just high parts leave black paint grooves cuts strips finished product 900 lines about V-in wide glues balsa dummy cylinders using medium CyA glue sample sent quite striking may just right next Peanut project Applications planes larger Peanuts can done simple expedient cutting some strips thin plastic credit cards about right width fins desired Strips about inch long t-in wide good glue stack alternating edges about V16 lower Thicker strips doubled strips can used between fin pieces level side strips effect have made own file such Gene uses different spacings between fins different fin widths Some practice getting just right depth impression foil using bigger sizes necessary foil cheap get grooves little too deep can pull little flatter after painting sanding theyll wrap around dummy cylinder easily Finally planned pil grimage Southern California Flightmasters Annual September should advised event has put off until December 56 1987 Events will include Rubber AMA Scale Gas AMA Scale Peanut Scale Jumbo Scale Multi-Engine Scale FF Jet Scale will banquet Saturday night following Scale judging flying set new field near March AFB Sunday Drop SASE details Until next time keep using wooden props bend yer crankshaft crash Bill Warner 423-C San Vicente Blvd Santa Monica CA 90402 Ex-Cels/Dunlop Continued page 79 Remove fuselage board fit glue carbon fiber X bulkheads part guaranteed try patience hang Now punch out -in-dia discs carbon fiber mat Lightly spray side 3M 77 contact glue before glue dry fold around joints Continued page 174 172 Model Aviation oldr perfectly proportionecz modeling Curtiss Robin 049 Engines -Channel R/C 41 Wingspan Electric Power Optional 82295 0 rO3 Very ten full soale aircraft ideally suited model flight appealing old Curtiss Robin born spruce lines age beaatrfally proportioned rubber electric glow engines Easy fan build trainer-like performance Flylne Models Catalog hOe Phone 17031 273-9593 INE MODELS INC PO Box 2138 FaIrfax VirgInIa 22031 USA Folding INTERCEPTOR Ready Fly $695 U-build Kit $495 Note Please add $3 P & H lst3 models. Add 10 % price foe additional modal AmedtAIUA~P AIRCRAFT COM PAN P0 Box 68132 Portland OR 97268 NOWA 30% Size VA ILA BLE Standoff Scale Extra 230 Kits199 new scaleetyle cowl plus $14 shipping 87 Wingspan 150 sq Wing Area Power 038 G38 ST2SOO ST3000 Also Avallahiet 1/3 Scale Kit $19995 plus $14 shipping 1/4 Scale Kit $16995 pius $8 shipping cash MO -VISA Mc ceilified check RIC EX1R4S 712-943-4102 RRI Box 283 Sergeant Bluff IA 51054 diagonals come together Hit pene trating CyA Install A2 ply timer plate blind nuts timer Dont forget install whatever dethermalizer DT hardware auto con trol setups going use proper phase construction Accurately cut pylon slot top deck remove ties bulk heads Note slot made long can made longer adjust center-ofgravity positioning Install cheeks carve shape Laminate add blind nuts install firewall Install stab platform incidence block VTO vertical takeoft peg Laminate build pylon wing platform inset carbon fiber strips both pylon platform flush makes neater job Fit pylon fuselage making sure angle attack correct Covering can use covering ma terial desire worries about structural rigidity lightest strongest rigid construction ever lightest flexible ironon plastics acceptable use Micafilm light strong difficult handle Heres method rear fuselage stab fin wing tips use clear lightestweight Micafilm main wing pan els covered stronger heavier white film Use 3M 77 contact spray Balsarite thinned 60% glue 40% thin ner Put two coats thinned Balsarite coat 3M 77 spray surfaces will contact covering except carbon fiber cap strips Cover bottom first Securely adhere cover wing outline Shrink cover gently low heat Trim outline go over glue contact line inside carbon fiber rods penetrating CyA too much no accelerator Cover top using -in-minimum overlaps Use 3M 77 spray two coats thinned Balsarite overlaps Shrink top gently low heat Now hit edges overlaps penetrating CyAand again no accelerator Shrink completely high heat top bottom Check remove undesired warps Now run iron low heat over surface contacts covering ribs sparsbut carbon fiber cap strips way to slowly run iron over small contact area rub firmly finger until cools set Dont burn fingers After completing step go over entire surface high heat check warps locks covering up tight everywhere easier patch outline wing stab fluorescent orange paint its exceptional visibility Clean area painted dope thinner better adhesion After orange paint sprayed apply coat Super Poxy over Center-of-gravity CG Before finishing front end assemble parts hard ware modeland means thing safe side add about two grams weight rear Now shift pylon forward backward case may indicated CGabout 66% 69% model becomes unstable Mter disassembly glue pylon position Follow own favorite time-proven method finish front end use light weight fiberglass tissue nitrate dope Super Poxy Add decals AMA number nameplate etc assemble Make sure wing exactly 900 key Note puzzling power patterns high-speed models can tributed wing perfectly lined up especially true very hot model Recheck CG Hying Check out systems ground engine running use pacifier fuel system pressure pinch-off fuel cutoff very close prox imity pinch-off venturi provides very quick positive shutoff no danger leaning out blowing plug As result plugs last longer can consistently run higher nitro could old flood-off system first flights 40% nitro 3- 3-second run quick DT four five seconds use rudder tab adjust incidence block control power pattern ideal pattern just about vertical slight twist right looks good gradually increase engine run about second time adjust Whenthe model can hold power pattern seven seconds longer test adjust variable incidence tail VIT glide use stab tilt glide circle seven-second engine run 15-to 20-second glide DT should keep model out trouble Once glide has adjusted increase fuel 50% nitro start over pattern 3-to 3-second engine run adjust etc time nitro percent fuel increased now have model super-light superstrong very competitive Handle TLC see flyoffs Sources carbon fiber material 1 Bob Violett 1373 Citrus Rd Winter Springs FL 32708 050-dia rod mat rope laminates 2 Twinn-K Inc PO Box 31228 Indian apolis IN 46231 070-dia rod laminates 3 Jim Bradley 1337 Pine Sap Ct Orlando FL 32817 060-dia rod mat laminates 4 Aerospace Composite Products PO Box 16621 Irvine CA 92714 050- 060- 070dia rods mat rope laminates Indoor Champs/Linstrum Continued page 82 built magnificent 1909 Aerodrome Silver Dart mentioned earlier first Canadian-designed aircraft fly canard pusher configuration model reminiscent Wright flyer Jeurgen MAAC member protege Scale expert Ken Groves mechanical engineering student University Waterloo Toronto Jack Humphries sug gested build researched model finding information Hammonds Sport Era covers pioneering types modeler since 1980 Jeurgen devoted over month building-time gem Complete wire bracing controls museum qualityyet has flight times over 30 sec Another up-and-coming Scale flier 24year-old Kevin Smith Ft Lauderdale FL labored long night Continued page 176 174 Model Aviation
Edition: Model Aviation - 1987/10
Page Numbers: 76, 77, 78, 79, 172, 174
Top The family portrait Theyve successful too capturing wins 1/2A A-B C-D classes Free Flight Left author prepares fire up winning flight Class event 1986 Nats Lake Charles Right get moat out short engine runs allowed imperative get weight low possible translates carbon fiber because little else market can match its strength weight ratio 76 Model Aviation Its always type construction plus type material used determined strength given structure both sophisticated model have expect superior results THE PUN its name no idle boast Ex-Cels high achiever indeed stateof-the-art model capable meeting challenge new Category III flyoff rules Although its named series Above main wing panel pinned position addition carbon fiber CF cap strips Above right wing tip biocked up warped position 1/16-in washout giuing CF caps strips Note easy-does-it jig instaliing poiyhedrai rib correct angie Right front end sports very iight Tomy timer trips fuei pinch off unit iocated ciose venturi troubie-free piumbing very attractive Magnaiite iogo avaiiabie Bob Vioiett modeis carbon fiber X-cells glued together form light strong rigid structure like implied salute performs too design am indebted Bob Bill Hunter well number others ideas have used elaborated upon Parts finished Ex-Cels re semble versions couldnt have done However good second look will show Ex-Cels has undergone evolutionary stages Using very unorthodox construction methods materials experimented until satis fied Id made necessary changes design parameters establish near-opti mum performance Fin area increased control wandering tendency power variable incidence tail plane added optimum glide adjustment airfoil changed 9% wing area increased wing taper improved overall drag re duced still maintaining actual lift characteristics wing changes along ultra-light construction have enhanced glide Because reduced drag lighter weight model altitude gained power has improved ultra-light tail feathers have made feasible lengthen tail moment nose has shortened adding stability power wing built no warps main panels 6in washout tips reduces drag Because reduced drag lighter weight mod el altitude gained power has improved 00 downthrust 10 left thrust model neutral easy trim designed increase acceleration altitude obtainable four-second engine run better chances making 2-minute max Construction say least construc tion very unusual X-frame adds tremendous rigidity judicious use carbon fiber materials provides light ness carbon fiber rod easy cut handle has no slivers use elec tricians combination stripper/cutter tool just put 4-40 bolt cutter hole shears carbon fiber off cleanly Carbon fiber sands files readily 007-in laminate unidirectional very strong dimensionally stable lengthwise very easily split across grain well easiest way cut snip desired width strip length needed rub fingers along edges because plywood can pick up slivers Cyanoacrylate CyA glues work fine epoxy heavier also good Since CyA attracts absorbs fuel-oil mix use make sure dont use around firewall fuel tank Use epoxy wherever glue joint could exposed fuel Wing Use two straightedges over plans guides leading edge LE trailing edge TE make sure straight use in alumi num strips builder supply Drill small holes strips small brads nail building board Using pins angle pin LE TE against straightedges Position bottom spar hold place crossed pins weights Glue ribs place making sure dihedral polyhedral ribs Left As done wing center section stab pinned position instaiiation CF cap strips Right Once giue cures CF strips top stabiiizer fiipped over squared up support biocks CF cap strips added bottom October 1987 77 correct respective angles Fit glue webbing carbon fiber cap strips place grain webbing parallel bottom Leave top webbing little heavy sanded flush ribs Note method carbon fiber cap strips will slightly above surface ribs can inset flush wish have done both ways have found insetting lot work little compensating ad vantage other neatness Careftilly sand tops webbing flush ribs mark tops rib5 very soft charcoal pencil able tell sandpaper has cut down ribs Cut slots spar turbulator spars webbing glue place Keeping carbon fiber cap strips centered approximately glue place top webbing Note Make sure panel perfectly flat blocked up warp want Once cap strips glued webbing impossible change panel structure Turn panel over block up LE TE panel either flat warp want Glue bottom carbon fiber cap strips place Now run bead fillet slow-set CyA along webbing cap strips hit accelerator very important step dont eliminate use fillet both sides webbing top bottom wing side stab Fit glue main spar webbing Verti cal grain OK necessary Complete wing panels fashion Before joining panels carefully cut slot dihedral polyhedral ribs between main spars plywood brace/webbing Line up block up main wing panel its matching tip panel Carefully fit plywood brace/webbing between main spars until nice easy fitno binding anywhere will have remove replace panel panels lined up blocked up spot-glue brace/webbing main panel Now can slide panels apart apply glue very slow-set CyA works slide back together allow set lined-up blocked-up position Assem ble entire wing fashion Add LE TE dihedral poly hedral braces shown built up carbon fiber tow carbon fiber rope epoxy find Hobby Poxy #2 works very well wets tow better has longer working life also longer curing tune Cut slots braces nothing fussy cover slots bottom wing heavy masking tape Put light layer epoxy bottom slot K K 133~3333 333s3I 3- 3 rr4h1 53 3-33333333333 33-33 33333 1 right tape Now take small bundle carbon fiber tow approximately V16-in diameter spread evenly bot tom slot Add another layer epoxy layer tow until slot filled Build top up little sanding after cured braces much stronger plywood Glue fiberglass reinforcements shown gussets centerline Cut Above DT ViT setup Note gussets construction particulars arrangement ultra-light well suited models short nose moment Left retaining cable atab preventa DTing up past approximately 45 Set DT fuse short flights trimming 78 Model Aviation 7 fuselage assembled carbon fiber rod Warren-truss type construction lightweight strong super rigid front end 01 tuselage wltn ins ouncneads place Thetis bulkheads will removed after slot cut top deck CF rod best cut wire strippers shown Full-Size Plans Available. See Page 188 EPT $rQE ____________________________I G,7 5D 4seC S 45 3/4-in squares carbon fiber mat spray side lightly 3M 77 contact glue Before glue dry wrap squares around LE TE ribs Squeeze together gently tear apart hit penetrating CyA method makes very strong joint despite mini mal glue wood area now have wing very light very strong rigid enough lightest flexible iron-on plastics Stab Fin stab construction same wingjust keep light As wing stab construction making fins also involves unconven tional methods Glue carbon fiber rods gussets together outline three sides no base Block up outline correct height glue base ribs webbing place Sand tapered symmetrical shape Add carbon fiber cap strips both sides webbing outline same blocks Fuselage Make sides first Set up straightedges using same method wing pin down longerons Fit glue verticals diagonals Add front side balsa panels sure make right left side right side left side diagonals also different Fit glue front carbon fiber longeron doublers Without changing straightedges stand sides up top edges down Fit crosspieces make top bottom pieces exactly same length glue both go along An alternative method finish top first turn over finish bottom use blocks cold rolled steel 1 x help keep everything square Add deck fin Fit glue diagonals go Fit glue top front deck pylon slot Laminate fit front bulitheads Make sure will right height bottom deck before gluing place Par tially cut pylon slot center bulkhead different Leave small ties near top bottom removed later before gluing place Fit glue bottom deck Continued page 172 October 1987 79 45 CCSCSCSSC bare-bones struciurs snows ins ui construction X-oeII structure provides Biock up perimeter fin Instali cap strips place secure smaii weight 4 gotta borrow glow borrow 4 besi OPS GLOW PLUGS Are Available Local Hobby Shop Parts People Comfeeto% %uo44 PO Box 26247 Orleans LA 70186 0-535-2568 Whitehead pre-Wright flight controversy heating up abetted continuing efforts dedicated group aero-historians crafts men up Fairfield CT Gustave Whitehead may have beaten Wil Orv air couple years folks have built replica No 21 Whitehead machine first flew sum mer last year will probably have further test flown time reading Flights up 330 ft length altitudes up five feet have far proven craft airworthy controllable using throttles No 21 two props remember Testing will enter new phase Whitehead engines can replicated installed replace present ultralight-type engines interesting sidelight replicas flights has still-air takeoff capabilities ship did take off fly still air will recall original Wright flier capable taking off still air under its own power required 27-mph head wind Kittyhawk catapult Dayton Whitehead two 10-horsepower engines opposed Wrights single 12-horsepower also another engine connected front wheels get up takeoff speed Remember horsepower ratings back days gave low-rpm torquea fact dis covered replica builders film Magnificent Men Flying Machines problems getting air modern high-revving engines double horsepower originals Bill ODwyer almost single-handedly kept Whitehead inquiry going over past 25 years says should watch 60 Minutes October Americans will get exposure Whitehead flights first time Continuing subject dummy engines interesting approach subject suggested Gene Pierre Princeton NJ manufac tures nifty fake fins wrap around partial cylinders smoothing piece aluminum foil flat clean surface using edge flat rubber eraser next places foil dull-sideup over file has clean undamaged parallel teeth uses flat single-cut file about inch wide has about nine inches toothed area rubs foil end eraser direction files tooth ridges After removing foil file Gene paints foil dull black Floquil model railroad paint allows itto dry lightly sands direction ridges may require two coats idea clean off just high parts leave black paint grooves cuts strips finished product 900 lines about V-in wide glues balsa dummy cylinders using medium CyA glue sample sent quite striking may just right next Peanut project Applications planes larger Peanuts can done simple expedient cutting some strips thin plastic credit cards about right width fins desired Strips about inch long t-in wide good glue stack alternating edges about V16 lower Thicker strips doubled strips can used between fin pieces level side strips effect have made own file such Gene uses different spacings between fins different fin widths Some practice getting just right depth impression foil using bigger sizes necessary foil cheap get grooves little too deep can pull little flatter after painting sanding theyll wrap around dummy cylinder easily Finally planned pil grimage Southern California Flightmasters Annual September should advised event has put off until December 56 1987 Events will include Rubber AMA Scale Gas AMA Scale Peanut Scale Jumbo Scale Multi-Engine Scale FF Jet Scale will banquet Saturday night following Scale judging flying set new field near March AFB Sunday Drop SASE details Until next time keep using wooden props bend yer crankshaft crash Bill Warner 423-C San Vicente Blvd Santa Monica CA 90402 Ex-Cels/Dunlop Continued page 79 Remove fuselage board fit glue carbon fiber X bulkheads part guaranteed try patience hang Now punch out -in-dia discs carbon fiber mat Lightly spray side 3M 77 contact glue before glue dry fold around joints Continued page 174 172 Model Aviation oldr perfectly proportionecz modeling Curtiss Robin 049 Engines -Channel R/C 41 Wingspan Electric Power Optional 82295 0 rO3 Very ten full soale aircraft ideally suited model flight appealing old Curtiss Robin born spruce lines age beaatrfally proportioned rubber electric glow engines Easy fan build trainer-like performance Flylne Models Catalog hOe Phone 17031 273-9593 INE MODELS INC PO Box 2138 FaIrfax VirgInIa 22031 USA Folding INTERCEPTOR Ready Fly $695 U-build Kit $495 Note Please add $3 P & H lst3 models. Add 10 % price foe additional modal AmedtAIUA~P AIRCRAFT COM PAN P0 Box 68132 Portland OR 97268 NOWA 30% Size VA ILA BLE Standoff Scale Extra 230 Kits199 new scaleetyle cowl plus $14 shipping 87 Wingspan 150 sq Wing Area Power 038 G38 ST2SOO ST3000 Also Avallahiet 1/3 Scale Kit $19995 plus $14 shipping 1/4 Scale Kit $16995 pius $8 shipping cash MO -VISA Mc ceilified check RIC EX1R4S 712-943-4102 RRI Box 283 Sergeant Bluff IA 51054 diagonals come together Hit pene trating CyA Install A2 ply timer plate blind nuts timer Dont forget install whatever dethermalizer DT hardware auto con trol setups going use proper phase construction Accurately cut pylon slot top deck remove ties bulk heads Note slot made long can made longer adjust center-ofgravity positioning Install cheeks carve shape Laminate add blind nuts install firewall Install stab platform incidence block VTO vertical takeoft peg Laminate build pylon wing platform inset carbon fiber strips both pylon platform flush makes neater job Fit pylon fuselage making sure angle attack correct Covering can use covering ma terial desire worries about structural rigidity lightest strongest rigid construction ever lightest flexible ironon plastics acceptable use Micafilm light strong difficult handle Heres method rear fuselage stab fin wing tips use clear lightestweight Micafilm main wing pan els covered stronger heavier white film Use 3M 77 contact spray Balsarite thinned 60% glue 40% thin ner Put two coats thinned Balsarite coat 3M 77 spray surfaces will contact covering except carbon fiber cap strips Cover bottom first Securely adhere cover wing outline Shrink cover gently low heat Trim outline go over glue contact line inside carbon fiber rods penetrating CyA too much no accelerator Cover top using -in-minimum overlaps Use 3M 77 spray two coats thinned Balsarite overlaps Shrink top gently low heat Now hit edges overlaps penetrating CyAand again no accelerator Shrink completely high heat top bottom Check remove undesired warps Now run iron low heat over surface contacts covering ribs sparsbut carbon fiber cap strips way to slowly run iron over small contact area rub firmly finger until cools set Dont burn fingers After completing step go over entire surface high heat check warps locks covering up tight everywhere easier patch outline wing stab fluorescent orange paint its exceptional visibility Clean area painted dope thinner better adhesion After orange paint sprayed apply coat Super Poxy over Center-of-gravity CG Before finishing front end assemble parts hard ware modeland means thing safe side add about two grams weight rear Now shift pylon forward backward case may indicated CGabout 66% 69% model becomes unstable Mter disassembly glue pylon position Follow own favorite time-proven method finish front end use light weight fiberglass tissue nitrate dope Super Poxy Add decals AMA number nameplate etc assemble Make sure wing exactly 900 key Note puzzling power patterns high-speed models can tributed wing perfectly lined up especially true very hot model Recheck CG Hying Check out systems ground engine running use pacifier fuel system pressure pinch-off fuel cutoff very close prox imity pinch-off venturi provides very quick positive shutoff no danger leaning out blowing plug As result plugs last longer can consistently run higher nitro could old flood-off system first flights 40% nitro 3- 3-second run quick DT four five seconds use rudder tab adjust incidence block control power pattern ideal pattern just about vertical slight twist right looks good gradually increase engine run about second time adjust Whenthe model can hold power pattern seven seconds longer test adjust variable incidence tail VIT glide use stab tilt glide circle seven-second engine run 15-to 20-second glide DT should keep model out trouble Once glide has adjusted increase fuel 50% nitro start over pattern 3-to 3-second engine run adjust etc time nitro percent fuel increased now have model super-light superstrong very competitive Handle TLC see flyoffs Sources carbon fiber material 1 Bob Violett 1373 Citrus Rd Winter Springs FL 32708 050-dia rod mat rope laminates 2 Twinn-K Inc PO Box 31228 Indian apolis IN 46231 070-dia rod laminates 3 Jim Bradley 1337 Pine Sap Ct Orlando FL 32817 060-dia rod mat laminates 4 Aerospace Composite Products PO Box 16621 Irvine CA 92714 050- 060- 070dia rods mat rope laminates Indoor Champs/Linstrum Continued page 82 built magnificent 1909 Aerodrome Silver Dart mentioned earlier first Canadian-designed aircraft fly canard pusher configuration model reminiscent Wright flyer Jeurgen MAAC member protege Scale expert Ken Groves mechanical engineering student University Waterloo Toronto Jack Humphries sug gested build researched model finding information Hammonds Sport Era covers pioneering types modeler since 1980 Jeurgen devoted over month building-time gem Complete wire bracing controls museum qualityyet has flight times over 30 sec Another up-and-coming Scale flier 24year-old Kevin Smith Ft Lauderdale FL labored long night Continued page 176 174 Model Aviation
Edition: Model Aviation - 1987/10
Page Numbers: 76, 77, 78, 79, 172, 174
Top The family portrait Theyve successful too capturing wins 1/2A A-B C-D classes Free Flight Left author prepares fire up winning flight Class event 1986 Nats Lake Charles Right get moat out short engine runs allowed imperative get weight low possible translates carbon fiber because little else market can match its strength weight ratio 76 Model Aviation Its always type construction plus type material used determined strength given structure both sophisticated model have expect superior results THE PUN its name no idle boast Ex-Cels high achiever indeed stateof-the-art model capable meeting challenge new Category III flyoff rules Although its named series Above main wing panel pinned position addition carbon fiber CF cap strips Above right wing tip biocked up warped position 1/16-in washout giuing CF caps strips Note easy-does-it jig instaliing poiyhedrai rib correct angie Right front end sports very iight Tomy timer trips fuei pinch off unit iocated ciose venturi troubie-free piumbing very attractive Magnaiite iogo avaiiabie Bob Vioiett modeis carbon fiber X-cells glued together form light strong rigid structure like implied salute performs too design am indebted Bob Bill Hunter well number others ideas have used elaborated upon Parts finished Ex-Cels re semble versions couldnt have done However good second look will show Ex-Cels has undergone evolutionary stages Using very unorthodox construction methods materials experimented until satis fied Id made necessary changes design parameters establish near-opti mum performance Fin area increased control wandering tendency power variable incidence tail plane added optimum glide adjustment airfoil changed 9% wing area increased wing taper improved overall drag re duced still maintaining actual lift characteristics wing changes along ultra-light construction have enhanced glide Because reduced drag lighter weight model altitude gained power has improved ultra-light tail feathers have made feasible lengthen tail moment nose has shortened adding stability power wing built no warps main panels 6in washout tips reduces drag Because reduced drag lighter weight mod el altitude gained power has improved 00 downthrust 10 left thrust model neutral easy trim designed increase acceleration altitude obtainable four-second engine run better chances making 2-minute max Construction say least construc tion very unusual X-frame adds tremendous rigidity judicious use carbon fiber materials provides light ness carbon fiber rod easy cut handle has no slivers use elec tricians combination stripper/cutter tool just put 4-40 bolt cutter hole shears carbon fiber off cleanly Carbon fiber sands files readily 007-in laminate unidirectional very strong dimensionally stable lengthwise very easily split across grain well easiest way cut snip desired width strip length needed rub fingers along edges because plywood can pick up slivers Cyanoacrylate CyA glues work fine epoxy heavier also good Since CyA attracts absorbs fuel-oil mix use make sure dont use around firewall fuel tank Use epoxy wherever glue joint could exposed fuel Wing Use two straightedges over plans guides leading edge LE trailing edge TE make sure straight use in alumi num strips builder supply Drill small holes strips small brads nail building board Using pins angle pin LE TE against straightedges Position bottom spar hold place crossed pins weights Glue ribs place making sure dihedral polyhedral ribs Left As done wing center section stab pinned position instaiiation CF cap strips Right Once giue cures CF strips top stabiiizer fiipped over squared up support biocks CF cap strips added bottom October 1987 77 correct respective angles Fit glue webbing carbon fiber cap strips place grain webbing parallel bottom Leave top webbing little heavy sanded flush ribs Note method carbon fiber cap strips will slightly above surface ribs can inset flush wish have done both ways have found insetting lot work little compensating ad vantage other neatness Careftilly sand tops webbing flush ribs mark tops rib5 very soft charcoal pencil able tell sandpaper has cut down ribs Cut slots spar turbulator spars webbing glue place Keeping carbon fiber cap strips centered approximately glue place top webbing Note Make sure panel perfectly flat blocked up warp want Once cap strips glued webbing impossible change panel structure Turn panel over block up LE TE panel either flat warp want Glue bottom carbon fiber cap strips place Now run bead fillet slow-set CyA along webbing cap strips hit accelerator very important step dont eliminate use fillet both sides webbing top bottom wing side stab Fit glue main spar webbing Verti cal grain OK necessary Complete wing panels fashion Before joining panels carefully cut slot dihedral polyhedral ribs between main spars plywood brace/webbing Line up block up main wing panel its matching tip panel Carefully fit plywood brace/webbing between main spars until nice easy fitno binding anywhere will have remove replace panel panels lined up blocked up spot-glue brace/webbing main panel Now can slide panels apart apply glue very slow-set CyA works slide back together allow set lined-up blocked-up position Assem ble entire wing fashion Add LE TE dihedral poly hedral braces shown built up carbon fiber tow carbon fiber rope epoxy find Hobby Poxy #2 works very well wets tow better has longer working life also longer curing tune Cut slots braces nothing fussy cover slots bottom wing heavy masking tape Put light layer epoxy bottom slot K K 133~3333 333s3I 3- 3 rr4h1 53 3-33333333333 33-33 33333 1 right tape Now take small bundle carbon fiber tow approximately V16-in diameter spread evenly bot tom slot Add another layer epoxy layer tow until slot filled Build top up little sanding after cured braces much stronger plywood Glue fiberglass reinforcements shown gussets centerline Cut Above DT ViT setup Note gussets construction particulars arrangement ultra-light well suited models short nose moment Left retaining cable atab preventa DTing up past approximately 45 Set DT fuse short flights trimming 78 Model Aviation 7 fuselage assembled carbon fiber rod Warren-truss type construction lightweight strong super rigid front end 01 tuselage wltn ins ouncneads place Thetis bulkheads will removed after slot cut top deck CF rod best cut wire strippers shown Full-Size Plans Available. See Page 188 EPT $rQE ____________________________I G,7 5D 4seC S 45 3/4-in squares carbon fiber mat spray side lightly 3M 77 contact glue Before glue dry wrap squares around LE TE ribs Squeeze together gently tear apart hit penetrating CyA method makes very strong joint despite mini mal glue wood area now have wing very light very strong rigid enough lightest flexible iron-on plastics Stab Fin stab construction same wingjust keep light As wing stab construction making fins also involves unconven tional methods Glue carbon fiber rods gussets together outline three sides no base Block up outline correct height glue base ribs webbing place Sand tapered symmetrical shape Add carbon fiber cap strips both sides webbing outline same blocks Fuselage Make sides first Set up straightedges using same method wing pin down longerons Fit glue verticals diagonals Add front side balsa panels sure make right left side right side left side diagonals also different Fit glue front carbon fiber longeron doublers Without changing straightedges stand sides up top edges down Fit crosspieces make top bottom pieces exactly same length glue both go along An alternative method finish top first turn over finish bottom use blocks cold rolled steel 1 x help keep everything square Add deck fin Fit glue diagonals go Fit glue top front deck pylon slot Laminate fit front bulitheads Make sure will right height bottom deck before gluing place Par tially cut pylon slot center bulkhead different Leave small ties near top bottom removed later before gluing place Fit glue bottom deck Continued page 172 October 1987 79 45 CCSCSCSSC bare-bones struciurs snows ins ui construction X-oeII structure provides Biock up perimeter fin Instali cap strips place secure smaii weight 4 gotta borrow glow borrow 4 besi OPS GLOW PLUGS Are Available Local Hobby Shop Parts People Comfeeto% %uo44 PO Box 26247 Orleans LA 70186 0-535-2568 Whitehead pre-Wright flight controversy heating up abetted continuing efforts dedicated group aero-historians crafts men up Fairfield CT Gustave Whitehead may have beaten Wil Orv air couple years folks have built replica No 21 Whitehead machine first flew sum mer last year will probably have further test flown time reading Flights up 330 ft length altitudes up five feet have far proven craft airworthy controllable using throttles No 21 two props remember Testing will enter new phase Whitehead engines can replicated installed replace present ultralight-type engines interesting sidelight replicas flights has still-air takeoff capabilities ship did take off fly still air will recall original Wright flier capable taking off still air under its own power required 27-mph head wind Kittyhawk catapult Dayton Whitehead two 10-horsepower engines opposed Wrights single 12-horsepower also another engine connected front wheels get up takeoff speed Remember horsepower ratings back days gave low-rpm torquea fact dis covered replica builders film Magnificent Men Flying Machines problems getting air modern high-revving engines double horsepower originals Bill ODwyer almost single-handedly kept Whitehead inquiry going over past 25 years says should watch 60 Minutes October Americans will get exposure Whitehead flights first time Continuing subject dummy engines interesting approach subject suggested Gene Pierre Princeton NJ manufac tures nifty fake fins wrap around partial cylinders smoothing piece aluminum foil flat clean surface using edge flat rubber eraser next places foil dull-sideup over file has clean undamaged parallel teeth uses flat single-cut file about inch wide has about nine inches toothed area rubs foil end eraser direction files tooth ridges After removing foil file Gene paints foil dull black Floquil model railroad paint allows itto dry lightly sands direction ridges may require two coats idea clean off just high parts leave black paint grooves cuts strips finished product 900 lines about V-in wide glues balsa dummy cylinders using medium CyA glue sample sent quite striking may just right next Peanut project Applications planes larger Peanuts can done simple expedient cutting some strips thin plastic credit cards about right width fins desired Strips about inch long t-in wide good glue stack alternating edges about V16 lower Thicker strips doubled strips can used between fin pieces level side strips effect have made own file such Gene uses different spacings between fins different fin widths Some practice getting just right depth impression foil using bigger sizes necessary foil cheap get grooves little too deep can pull little flatter after painting sanding theyll wrap around dummy cylinder easily Finally planned pil grimage Southern California Flightmasters Annual September should advised event has put off until December 56 1987 Events will include Rubber AMA Scale Gas AMA Scale Peanut Scale Jumbo Scale Multi-Engine Scale FF Jet Scale will banquet Saturday night following Scale judging flying set new field near March AFB Sunday Drop SASE details Until next time keep using wooden props bend yer crankshaft crash Bill Warner 423-C San Vicente Blvd Santa Monica CA 90402 Ex-Cels/Dunlop Continued page 79 Remove fuselage board fit glue carbon fiber X bulkheads part guaranteed try patience hang Now punch out -in-dia discs carbon fiber mat Lightly spray side 3M 77 contact glue before glue dry fold around joints Continued page 174 172 Model Aviation oldr perfectly proportionecz modeling Curtiss Robin 049 Engines -Channel R/C 41 Wingspan Electric Power Optional 82295 0 rO3 Very ten full soale aircraft ideally suited model flight appealing old Curtiss Robin born spruce lines age beaatrfally proportioned rubber electric glow engines Easy fan build trainer-like performance Flylne Models Catalog hOe Phone 17031 273-9593 INE MODELS INC PO Box 2138 FaIrfax VirgInIa 22031 USA Folding INTERCEPTOR Ready Fly $695 U-build Kit $495 Note Please add $3 P & H lst3 models. Add 10 % price foe additional modal AmedtAIUA~P AIRCRAFT COM PAN P0 Box 68132 Portland OR 97268 NOWA 30% Size VA ILA BLE Standoff Scale Extra 230 Kits199 new scaleetyle cowl plus $14 shipping 87 Wingspan 150 sq Wing Area Power 038 G38 ST2SOO ST3000 Also Avallahiet 1/3 Scale Kit $19995 plus $14 shipping 1/4 Scale Kit $16995 pius $8 shipping cash MO -VISA Mc ceilified check RIC EX1R4S 712-943-4102 RRI Box 283 Sergeant Bluff IA 51054 diagonals come together Hit pene trating CyA Install A2 ply timer plate blind nuts timer Dont forget install whatever dethermalizer DT hardware auto con trol setups going use proper phase construction Accurately cut pylon slot top deck remove ties bulk heads Note slot made long can made longer adjust center-ofgravity positioning Install cheeks carve shape Laminate add blind nuts install firewall Install stab platform incidence block VTO vertical takeoft peg Laminate build pylon wing platform inset carbon fiber strips both pylon platform flush makes neater job Fit pylon fuselage making sure angle attack correct Covering can use covering ma terial desire worries about structural rigidity lightest strongest rigid construction ever lightest flexible ironon plastics acceptable use Micafilm light strong difficult handle Heres method rear fuselage stab fin wing tips use clear lightestweight Micafilm main wing pan els covered stronger heavier white film Use 3M 77 contact spray Balsarite thinned 60% glue 40% thin ner Put two coats thinned Balsarite coat 3M 77 spray surfaces will contact covering except carbon fiber cap strips Cover bottom first Securely adhere cover wing outline Shrink cover gently low heat Trim outline go over glue contact line inside carbon fiber rods penetrating CyA too much no accelerator Cover top using -in-minimum overlaps Use 3M 77 spray two coats thinned Balsarite overlaps Shrink top gently low heat Now hit edges overlaps penetrating CyAand again no accelerator Shrink completely high heat top bottom Check remove undesired warps Now run iron low heat over surface contacts covering ribs sparsbut carbon fiber cap strips way to slowly run iron over small contact area rub firmly finger until cools set Dont burn fingers After completing step go over entire surface high heat check warps locks covering up tight everywhere easier patch outline wing stab fluorescent orange paint its exceptional visibility Clean area painted dope thinner better adhesion After orange paint sprayed apply coat Super Poxy over Center-of-gravity CG Before finishing front end assemble parts hard ware modeland means thing safe side add about two grams weight rear Now shift pylon forward backward case may indicated CGabout 66% 69% model becomes unstable Mter disassembly glue pylon position Follow own favorite time-proven method finish front end use light weight fiberglass tissue nitrate dope Super Poxy Add decals AMA number nameplate etc assemble Make sure wing exactly 900 key Note puzzling power patterns high-speed models can tributed wing perfectly lined up especially true very hot model Recheck CG Hying Check out systems ground engine running use pacifier fuel system pressure pinch-off fuel cutoff very close prox imity pinch-off venturi provides very quick positive shutoff no danger leaning out blowing plug As result plugs last longer can consistently run higher nitro could old flood-off system first flights 40% nitro 3- 3-second run quick DT four five seconds use rudder tab adjust incidence block control power pattern ideal pattern just about vertical slight twist right looks good gradually increase engine run about second time adjust Whenthe model can hold power pattern seven seconds longer test adjust variable incidence tail VIT glide use stab tilt glide circle seven-second engine run 15-to 20-second glide DT should keep model out trouble Once glide has adjusted increase fuel 50% nitro start over pattern 3-to 3-second engine run adjust etc time nitro percent fuel increased now have model super-light superstrong very competitive Handle TLC see flyoffs Sources carbon fiber material 1 Bob Violett 1373 Citrus Rd Winter Springs FL 32708 050-dia rod mat rope laminates 2 Twinn-K Inc PO Box 31228 Indian apolis IN 46231 070-dia rod laminates 3 Jim Bradley 1337 Pine Sap Ct Orlando FL 32817 060-dia rod mat laminates 4 Aerospace Composite Products PO Box 16621 Irvine CA 92714 050- 060- 070dia rods mat rope laminates Indoor Champs/Linstrum Continued page 82 built magnificent 1909 Aerodrome Silver Dart mentioned earlier first Canadian-designed aircraft fly canard pusher configuration model reminiscent Wright flyer Jeurgen MAAC member protege Scale expert Ken Groves mechanical engineering student University Waterloo Toronto Jack Humphries sug gested build researched model finding information Hammonds Sport Era covers pioneering types modeler since 1980 Jeurgen devoted over month building-time gem Complete wire bracing controls museum qualityyet has flight times over 30 sec Another up-and-coming Scale flier 24year-old Kevin Smith Ft Lauderdale FL labored long night Continued page 176 174 Model Aviation
