MOST CLUBS have least expert building foam wings Paducah Aero modelers Paducah KY have Dave Paess ler makes beautiful foam wings RC models nobody has experience building foam wings CL aircraft article intended supply basic technology needed build CL Precision Aerobatics foam wing pro cedure two three times difficult foam wing RC uses Choice particular airfoil will dealt assumes have set plans airfoil already laid out Lets get right begin study Fig 1 names parts will foam-core wings alike arent really author provides some good how-to formation about foam-core wings Control Line Precision Aero batics models UT Michael Jennings discussed first step redraw root rib Youll need legal-sized 8 x 14 pad ruled paper usually yellow Draw centerline perpendicular lines pad Draw centerline through root rib plans Tape ruled paper over plans centerlines aligned make short dashed lines plan rib intersects lines ruled paper upper half rib see Photo 1 Measure centerline intersected ruled line use measure ment locate lower half rib technique will assure symmetrical airfoil Photo 2 Connect dashed lines together smooth curve Using same procedure make layout tip rib stage have outer profile both ribs leading trailing edges -in balsa indicate balsa rib profiles Locate bellcrank centerline root rib drawing Find lead-out center line center position tip rib drawing two centerlines will de termine center front foam spar spar 0300 wide 0150 side centerline parallel either leading trailing edge aft foam spar should positioned halfway between bellcrank centerline trailing edge spar will parallel trailing edge 0300 wide airfoil foam support 0200 wide Lay out using same techniques laying out airfoil connect odel Aviation Authorwith completed foamcorewing perthisarticlefora imitation PrecislonAsrobatlcs model Its lIghtweight straight once have setup fasterto build framework wing Investment will about SlO materials 10 manhours first ALL dashed lines together Three cavities defined airfoil foam support leading edge front foam spar aft foam spar trailing edge should radius least oil foam support inner line turns foam spars m radius should both root rib tip rib stations See Photo 4 Make two copies rib drawing Cut out copy both root tip ribs airfoil shape cut out just rib cavities both root tip ribs other copy root tip templates can Masonite soft aluminum made cutouts source soft aluminum purpose aluminum siding used homes usually painted side kind aluminum can cut scissors Sanford Sharpie extra fine point marker about $1 office equip ment stores will mark Draw centerline aluminum Tape root rib cavity cutout aluminum centerlines aligned Draw around cutout edge same tip rib cavity cutout same process used making templates airfoil root tip templates must numbered along edge shown Photo 5 reference uniformly cutting foam Note numbers two patterns mirror images templates back back numbers will match up Cut out four aluminum templates lightly sand edges get smooth Getting smooth edges airfoil shape especially important edges rough nichrome cutting wire will slide smoothly first try doesnt produce templates smooth edges dis card make another set Foam used wings CL Precision Aerobatics models should have density pound per cubic foot piece shown pictures 4 thick Cut foam block inboard outboard wing April 1987 71 0 halves correct length tip root faces should perpendicular trailing edge face general procedure cut rib cavities first cut airfoil shape Tape rib cavity templates root tip foam block trace around felt-tip marker Youll have get nichrome cutting wire through length solid foam block An easy way through hole made drop wire jig constructed 3-ft length 2 x 4 wood three eye screws length -in piano wire Photo 6 shows jig construction idea heat end piano wiie blowtorch drop through length foam block three rib cavity locations suc cessfully everything must carefully aligned drop wire jig foam block must vertical check 3ft level Use drop wire first trailing edge center cavities hole through leading edge cavity last parallel leading edge wire should enter tip about ard front foam spar shown Photo 7 Tape pin cavity templates foam block Photo 8 must se curely attached prevent movement cutting Disassemble hot-wire cutter fish nichrome wire through holes made drop wire Reassemble cutter hold insulated part turn power person should end cutter guide hot wire properly idea person guide wire same relative position templates reason templates num bered see cutting operation progress Photo 9 easier generally person root airfoil end call out numbers aid person tip airfoil end maintaining same relative position may take couple tries get good coordination Turn off power after cavity has cut free let nichrome wire cool down careful burn yourrelfl Disassemble cutter wire repeatthis 72 Model Aviation process other two cavities finished remove cavity templates leave cavity cores place Tape pin airfoil templates place again see Photo 8 Careful align ment templates necessary assure airfoil foam support thickness will 0200 Cutting airfoil shape done numbers same way cavities cutting complete remove templates slip out cavity cores through root end course Once have finished examining masterpiece carefully slip cavity cores back place will flimsy Now comes installation ply wood spar cavity cores must place felt-tip marker trace front foam spar exterior surface airfoil will produce two parallel lines 0300 apart root tip both sides foam core -in plywood spar will go center 0300 lines length 8 m wing panel Draw lines ply spar within foam spar lines top bottom shown Photo 10 Cut slot -in ply spar hacksaw blade have taped end holding purposes carefullyjust 8 long Check slot right place both sides work Once cut ply spar finished measure airfoil thickness root 8 root dimensions hand can lay out spar cut two Lite Ply Make bellcrank cutouts lightening holes spar Photo 11 spar must fit snugly core falls through excess epoxy will needed gluing finished spar must flush foam core balsa skin can applied smoothiy spar properly sized epoxy place inboard foam core spar must inset allow room bellcrank bolt Epoxy leading trailing edges Cnntinud nn nno 167 April 1987 73 long-term effects will benefit fliers bring out worst everyone now its really worth go after big prizes may some new rules FAI Combat no sure what picture Greg Hills to-the-rules plane included viewing enjoyment model features Nemesisstyle construction using late-model Rossi power nicest features type model degree strength can built ultra-strong motor mounts used Rush Rudner can used well extra reinforc ing leading edge give opposition good whack 16-ounce models used would possible build really strong model since engines make up about four five ounces weight flying stresses arent high Fast model Could new style bump-and-run will develop FAI lot touch-the-ground-and-go before use remote needle assembly seems settle down setting engine besides getting needle far away prop Most people use OS 10 needle assembly either K&B Fox jet metal nylon bolt opposite-side hole Ive noticed latest trend leave hole openso model crashes quits some reason fuel will shoot out hole toward ground flood engine engine running velocity incoming air doesnt allow fuel spray out bottom side couple things arent exactly Combat items still worthy mention used got some sunglasses couple bucks besides looking cool killed some glare Now some really high-tech items market marvelous job filtering out bad rays Im sure theyd lot good pilots trying pick out opponents model against sky $30-$80 per pair would too expensive us evaluate enough make kind decision someone has experience variety glasses please write share information rest us Paul Smith has using audio tape record matches calls start flying style cuts kills etc course would spaced over tape happened sent transcript some matches held Hungary summer its possible reconstruct what going happen have small tape player might take along next meet try calling matches play back home chart what happened listen watch clock Its actually possibility instantreplay device could used contests Ive seen Speed guys use recorder could clock individual laps speed Charlie Johnson 3716 Ingraham St San Diego CA 92109 CL Foam Wings/Jennings Continued page 73 cores leading edge n strip balsa trailing edge also balsa ark centerline -in side trailing edge locates hinge line flaps Locate cut hinge slot trailing edge strips ATRPTN p-STAGE PRESSURE GUAGE MORE GOODIES CANOPY TRACK AIRPIN PRESS GUAGE CUSGUM AIR CYLINDERS PROPHUT/SPIRHER ATTACH EXT PROPSUES FOR -lO FI4U etc AIR OPERATED LATCH AThAS SOce ESGIRES STRONG OLD TINEN KITS SEND SASE FOR INFO DEAlER INQUIRES INVITED PHONE3O 731A1 1411 ICYLINDERS ROBINA IRE P0 B0X6766 LAKE WORTH FLORIDA 33466-0766 April1987 167 GEAR I4ECHANICS FOR NIGGlES CL-2 LATCH FOR COWL HATCH CANOPY & WINO pp p p1h g p BENTOM BROWN JH- CAMPHLLL COMET COVERITE COX DUBRO EASY BUILT MODELS ENYA FAF FLYLINE FOX GOLDBERG GOLDEN AGE REPRO GENE DUBOIS GUILLOW- K&B K&S L R MRC OS MAX PACTRA- PECK-POLYMER PERFECT R N MODELS SEAGLEN SIG STERLING SULLIVAN SUPER TIGRE TAFFINDER TELCO TOP FLITE- TREXLER WILLIAMS & OTHERS ESTES MODEL ROCKETS Send 1100 Csh Check Stanspa oar 44 page tabloid nice DISCOUNT Catalog 900 illustrations over 700 Kits choose MAILORDER PHONEORDER IN STORE PENN VALLEY HOllY CENTER 87 WMain St Lansdalsla19446 Problems lems Splitting thin ribs pinning Keeping ribs square vertical straight Strong glue joints Stop Dont ruin new airplane wing tail-2/ What Need Are NEW Joint Points come 5 slot sizes 1/16 3/32 1/8 3/16 1/4 2 Makes perfect strong joint Needs no pins Distributes point loading compression tension torque Ask Favorite Hobby Dealer forJOIflt Points Packagel2pcsea $119 Su-Pr-Line product AI-Tec Products Inc Sidney Ohio 5 Glue leading trailing edge strips thinly-spread epoxy Hold strips place tape epoxy sets Sand leading trailing edges correct shape must smooth transition foam core trailing edge balsa skin will overlap aid sanding balsa sanding foam tape piece lightweight cardboard such notebook divider over foam butted against balsa blocksand Photo 12 Probably will have replace cardboard several times before finished balsa smooth cardboard re -move cardboard carefully sand until balsa smooth foam balsa skin overlap leading edge balsa leading edge should sanded similar fashion An alternate method glue sand leading edge balsa after balsa skin has glued Preparatory skinning wing blocksand foam core lightly want smooth ridges Dont go overboard foam thin fragile Vacuum sanded foam core care skin will /16 sheet contest balsa Edge-glue enough sheets together get width necessary cover side Mix enough 45-mm epoxy cover two skins Apply epoxy skin use playing card spread remove excess just right balsa skin will damp epoxy Lightly coat trailing edge leading edge overlap plywood spar edge excess epoxy will add weight provide strength skins applied cavity cores place added rigidity Starting leading edge roll skin over core would same using contact cement instead epoxy same skin other side Place subassembly back outer core saddles sandwiched together add weights top outer core saddies compress everything epoxy curing Make bellcrank assembly lead-outs Bush lead-outs 6 brass tubing through bellcrank Slip leadout through 1-in length tubing Slide tubing through bellcrank bend tubing smooth radius Make leadout cable connections per AMA rule book see Photo 13 Assemble bellcrank pushrod must secured bellcrank way interfere movement Notch inboard wing bellcrank support pushrod exit pushrod should installed bends between flap horn bellcrank might require larger exit notch normal Epoxy bellcrank assembly inboard wing Make sure operation smooth before going further Both wing halves now ready epoxy together outer core saddles provide support alignment both inboard edges trim away excess balsa skin foam cores should square sanded Remove cavity cores Lightly coat foam cores balsa skin inboard edges 45-mm epoxy Position two edges together core saddies trailing edges must straight alignment Photo 14 Allow epoxy set Cut two x 1-in plywood bellcrank supports Drill through centers epoxy wing skin will give bellcmank area enough strength 40-lb pull tests wing butt joint must reinforced 1-in strips fiberglass Lay down fiberglass brush epoxy through Remove excess epoxy playing card keep weight down wing condition described should now weighed used competitive Precision Aerobatics aircraft should 8 oz wing too heavy think uses other com petitions likely reason- tooheavy wing use ofA6 balsa other lightweight contest variety Building foam-core wing CL Pre cision Aerobatics beyond capa bilities average modeler com pleted wing will use about $10 worth materials take about 10 manhours time Making templates takes about half time making additional wings same design can done about five hours foam-core wing general easier faster always straighter built-up wing Installing wing tips flaps part article thanks Bob Vogel good friend photographic hobbyist pictures article Fokker/M ichaels Continued page 83 wing covered same man ner Use piece MonoKote starting attaching top trailing edge wrapping around rear wing across bottom attaching leading edge material attached top surface handy MonoKote can cover wing tips along rest wing prefer cover tips first rest wing piece Glue three pennies tip weight right tip bottom wing tail surfaces made /it-in sheet balsa easy assemble rudder made three pieces wood grain running directions shown plans Building rudder way makes stronger made piece elevators joined piece /16-in music wire attached stab strip MonoKote ironed across top gap serve hinge sure gap between two pieces wide enough allow elevator deflect downwards well upwards 168 Model Aviation
Edition: Model Aviation - 1987/04
Page Numbers: 70, 71, 72, 73, 167, 168
MOST CLUBS have least expert building foam wings Paducah Aero modelers Paducah KY have Dave Paess ler makes beautiful foam wings RC models nobody has experience building foam wings CL aircraft article intended supply basic technology needed build CL Precision Aerobatics foam wing pro cedure two three times difficult foam wing RC uses Choice particular airfoil will dealt assumes have set plans airfoil already laid out Lets get right begin study Fig 1 names parts will foam-core wings alike arent really author provides some good how-to formation about foam-core wings Control Line Precision Aero batics models UT Michael Jennings discussed first step redraw root rib Youll need legal-sized 8 x 14 pad ruled paper usually yellow Draw centerline perpendicular lines pad Draw centerline through root rib plans Tape ruled paper over plans centerlines aligned make short dashed lines plan rib intersects lines ruled paper upper half rib see Photo 1 Measure centerline intersected ruled line use measure ment locate lower half rib technique will assure symmetrical airfoil Photo 2 Connect dashed lines together smooth curve Using same procedure make layout tip rib stage have outer profile both ribs leading trailing edges -in balsa indicate balsa rib profiles Locate bellcrank centerline root rib drawing Find lead-out center line center position tip rib drawing two centerlines will de termine center front foam spar spar 0300 wide 0150 side centerline parallel either leading trailing edge aft foam spar should positioned halfway between bellcrank centerline trailing edge spar will parallel trailing edge 0300 wide airfoil foam support 0200 wide Lay out using same techniques laying out airfoil connect odel Aviation Authorwith completed foamcorewing perthisarticlefora imitation PrecislonAsrobatlcs model Its lIghtweight straight once have setup fasterto build framework wing Investment will about SlO materials 10 manhours first ALL dashed lines together Three cavities defined airfoil foam support leading edge front foam spar aft foam spar trailing edge should radius least oil foam support inner line turns foam spars m radius should both root rib tip rib stations See Photo 4 Make two copies rib drawing Cut out copy both root tip ribs airfoil shape cut out just rib cavities both root tip ribs other copy root tip templates can Masonite soft aluminum made cutouts source soft aluminum purpose aluminum siding used homes usually painted side kind aluminum can cut scissors Sanford Sharpie extra fine point marker about $1 office equip ment stores will mark Draw centerline aluminum Tape root rib cavity cutout aluminum centerlines aligned Draw around cutout edge same tip rib cavity cutout same process used making templates airfoil root tip templates must numbered along edge shown Photo 5 reference uniformly cutting foam Note numbers two patterns mirror images templates back back numbers will match up Cut out four aluminum templates lightly sand edges get smooth Getting smooth edges airfoil shape especially important edges rough nichrome cutting wire will slide smoothly first try doesnt produce templates smooth edges dis card make another set Foam used wings CL Precision Aerobatics models should have density pound per cubic foot piece shown pictures 4 thick Cut foam block inboard outboard wing April 1987 71 0 halves correct length tip root faces should perpendicular trailing edge face general procedure cut rib cavities first cut airfoil shape Tape rib cavity templates root tip foam block trace around felt-tip marker Youll have get nichrome cutting wire through length solid foam block An easy way through hole made drop wire jig constructed 3-ft length 2 x 4 wood three eye screws length -in piano wire Photo 6 shows jig construction idea heat end piano wiie blowtorch drop through length foam block three rib cavity locations suc cessfully everything must carefully aligned drop wire jig foam block must vertical check 3ft level Use drop wire first trailing edge center cavities hole through leading edge cavity last parallel leading edge wire should enter tip about ard front foam spar shown Photo 7 Tape pin cavity templates foam block Photo 8 must se curely attached prevent movement cutting Disassemble hot-wire cutter fish nichrome wire through holes made drop wire Reassemble cutter hold insulated part turn power person should end cutter guide hot wire properly idea person guide wire same relative position templates reason templates num bered see cutting operation progress Photo 9 easier generally person root airfoil end call out numbers aid person tip airfoil end maintaining same relative position may take couple tries get good coordination Turn off power after cavity has cut free let nichrome wire cool down careful burn yourrelfl Disassemble cutter wire repeatthis 72 Model Aviation process other two cavities finished remove cavity templates leave cavity cores place Tape pin airfoil templates place again see Photo 8 Careful align ment templates necessary assure airfoil foam support thickness will 0200 Cutting airfoil shape done numbers same way cavities cutting complete remove templates slip out cavity cores through root end course Once have finished examining masterpiece carefully slip cavity cores back place will flimsy Now comes installation ply wood spar cavity cores must place felt-tip marker trace front foam spar exterior surface airfoil will produce two parallel lines 0300 apart root tip both sides foam core -in plywood spar will go center 0300 lines length 8 m wing panel Draw lines ply spar within foam spar lines top bottom shown Photo 10 Cut slot -in ply spar hacksaw blade have taped end holding purposes carefullyjust 8 long Check slot right place both sides work Once cut ply spar finished measure airfoil thickness root 8 root dimensions hand can lay out spar cut two Lite Ply Make bellcrank cutouts lightening holes spar Photo 11 spar must fit snugly core falls through excess epoxy will needed gluing finished spar must flush foam core balsa skin can applied smoothiy spar properly sized epoxy place inboard foam core spar must inset allow room bellcrank bolt Epoxy leading trailing edges Cnntinud nn nno 167 April 1987 73 long-term effects will benefit fliers bring out worst everyone now its really worth go after big prizes may some new rules FAI Combat no sure what picture Greg Hills to-the-rules plane included viewing enjoyment model features Nemesisstyle construction using late-model Rossi power nicest features type model degree strength can built ultra-strong motor mounts used Rush Rudner can used well extra reinforc ing leading edge give opposition good whack 16-ounce models used would possible build really strong model since engines make up about four five ounces weight flying stresses arent high Fast model Could new style bump-and-run will develop FAI lot touch-the-ground-and-go before use remote needle assembly seems settle down setting engine besides getting needle far away prop Most people use OS 10 needle assembly either K&B Fox jet metal nylon bolt opposite-side hole Ive noticed latest trend leave hole openso model crashes quits some reason fuel will shoot out hole toward ground flood engine engine running velocity incoming air doesnt allow fuel spray out bottom side couple things arent exactly Combat items still worthy mention used got some sunglasses couple bucks besides looking cool killed some glare Now some really high-tech items market marvelous job filtering out bad rays Im sure theyd lot good pilots trying pick out opponents model against sky $30-$80 per pair would too expensive us evaluate enough make kind decision someone has experience variety glasses please write share information rest us Paul Smith has using audio tape record matches calls start flying style cuts kills etc course would spaced over tape happened sent transcript some matches held Hungary summer its possible reconstruct what going happen have small tape player might take along next meet try calling matches play back home chart what happened listen watch clock Its actually possibility instantreplay device could used contests Ive seen Speed guys use recorder could clock individual laps speed Charlie Johnson 3716 Ingraham St San Diego CA 92109 CL Foam Wings/Jennings Continued page 73 cores leading edge n strip balsa trailing edge also balsa ark centerline -in side trailing edge locates hinge line flaps Locate cut hinge slot trailing edge strips ATRPTN p-STAGE PRESSURE GUAGE MORE GOODIES CANOPY TRACK AIRPIN PRESS GUAGE CUSGUM AIR CYLINDERS PROPHUT/SPIRHER ATTACH EXT PROPSUES FOR -lO FI4U etc AIR OPERATED LATCH AThAS SOce ESGIRES STRONG OLD TINEN KITS SEND SASE FOR INFO DEAlER INQUIRES INVITED PHONE3O 731A1 1411 ICYLINDERS ROBINA IRE P0 B0X6766 LAKE WORTH FLORIDA 33466-0766 April1987 167 GEAR I4ECHANICS FOR NIGGlES CL-2 LATCH FOR COWL HATCH CANOPY & WINO pp p p1h g p BENTOM BROWN JH- CAMPHLLL COMET COVERITE COX DUBRO EASY BUILT MODELS ENYA FAF FLYLINE FOX GOLDBERG GOLDEN AGE REPRO GENE DUBOIS GUILLOW- K&B K&S L R MRC OS MAX PACTRA- PECK-POLYMER PERFECT R N MODELS SEAGLEN SIG STERLING SULLIVAN SUPER TIGRE TAFFINDER TELCO TOP FLITE- TREXLER WILLIAMS & OTHERS ESTES MODEL ROCKETS Send 1100 Csh Check Stanspa oar 44 page tabloid nice DISCOUNT Catalog 900 illustrations over 700 Kits choose MAILORDER PHONEORDER IN STORE PENN VALLEY HOllY CENTER 87 WMain St Lansdalsla19446 Problems lems Splitting thin ribs pinning Keeping ribs square vertical straight Strong glue joints Stop Dont ruin new airplane wing tail-2/ What Need Are NEW Joint Points come 5 slot sizes 1/16 3/32 1/8 3/16 1/4 2 Makes perfect strong joint Needs no pins Distributes point loading compression tension torque Ask Favorite Hobby Dealer forJOIflt Points Packagel2pcsea $119 Su-Pr-Line product AI-Tec Products Inc Sidney Ohio 5 Glue leading trailing edge strips thinly-spread epoxy Hold strips place tape epoxy sets Sand leading trailing edges correct shape must smooth transition foam core trailing edge balsa skin will overlap aid sanding balsa sanding foam tape piece lightweight cardboard such notebook divider over foam butted against balsa blocksand Photo 12 Probably will have replace cardboard several times before finished balsa smooth cardboard re -move cardboard carefully sand until balsa smooth foam balsa skin overlap leading edge balsa leading edge should sanded similar fashion An alternate method glue sand leading edge balsa after balsa skin has glued Preparatory skinning wing blocksand foam core lightly want smooth ridges Dont go overboard foam thin fragile Vacuum sanded foam core care skin will /16 sheet contest balsa Edge-glue enough sheets together get width necessary cover side Mix enough 45-mm epoxy cover two skins Apply epoxy skin use playing card spread remove excess just right balsa skin will damp epoxy Lightly coat trailing edge leading edge overlap plywood spar edge excess epoxy will add weight provide strength skins applied cavity cores place added rigidity Starting leading edge roll skin over core would same using contact cement instead epoxy same skin other side Place subassembly back outer core saddles sandwiched together add weights top outer core saddies compress everything epoxy curing Make bellcrank assembly lead-outs Bush lead-outs 6 brass tubing through bellcrank Slip leadout through 1-in length tubing Slide tubing through bellcrank bend tubing smooth radius Make leadout cable connections per AMA rule book see Photo 13 Assemble bellcrank pushrod must secured bellcrank way interfere movement Notch inboard wing bellcrank support pushrod exit pushrod should installed bends between flap horn bellcrank might require larger exit notch normal Epoxy bellcrank assembly inboard wing Make sure operation smooth before going further Both wing halves now ready epoxy together outer core saddles provide support alignment both inboard edges trim away excess balsa skin foam cores should square sanded Remove cavity cores Lightly coat foam cores balsa skin inboard edges 45-mm epoxy Position two edges together core saddies trailing edges must straight alignment Photo 14 Allow epoxy set Cut two x 1-in plywood bellcrank supports Drill through centers epoxy wing skin will give bellcmank area enough strength 40-lb pull tests wing butt joint must reinforced 1-in strips fiberglass Lay down fiberglass brush epoxy through Remove excess epoxy playing card keep weight down wing condition described should now weighed used competitive Precision Aerobatics aircraft should 8 oz wing too heavy think uses other com petitions likely reason- tooheavy wing use ofA6 balsa other lightweight contest variety Building foam-core wing CL Pre cision Aerobatics beyond capa bilities average modeler com pleted wing will use about $10 worth materials take about 10 manhours time Making templates takes about half time making additional wings same design can done about five hours foam-core wing general easier faster always straighter built-up wing Installing wing tips flaps part article thanks Bob Vogel good friend photographic hobbyist pictures article Fokker/M ichaels Continued page 83 wing covered same man ner Use piece MonoKote starting attaching top trailing edge wrapping around rear wing across bottom attaching leading edge material attached top surface handy MonoKote can cover wing tips along rest wing prefer cover tips first rest wing piece Glue three pennies tip weight right tip bottom wing tail surfaces made /it-in sheet balsa easy assemble rudder made three pieces wood grain running directions shown plans Building rudder way makes stronger made piece elevators joined piece /16-in music wire attached stab strip MonoKote ironed across top gap serve hinge sure gap between two pieces wide enough allow elevator deflect downwards well upwards 168 Model Aviation
Edition: Model Aviation - 1987/04
Page Numbers: 70, 71, 72, 73, 167, 168
MOST CLUBS have least expert building foam wings Paducah Aero modelers Paducah KY have Dave Paess ler makes beautiful foam wings RC models nobody has experience building foam wings CL aircraft article intended supply basic technology needed build CL Precision Aerobatics foam wing pro cedure two three times difficult foam wing RC uses Choice particular airfoil will dealt assumes have set plans airfoil already laid out Lets get right begin study Fig 1 names parts will foam-core wings alike arent really author provides some good how-to formation about foam-core wings Control Line Precision Aero batics models UT Michael Jennings discussed first step redraw root rib Youll need legal-sized 8 x 14 pad ruled paper usually yellow Draw centerline perpendicular lines pad Draw centerline through root rib plans Tape ruled paper over plans centerlines aligned make short dashed lines plan rib intersects lines ruled paper upper half rib see Photo 1 Measure centerline intersected ruled line use measure ment locate lower half rib technique will assure symmetrical airfoil Photo 2 Connect dashed lines together smooth curve Using same procedure make layout tip rib stage have outer profile both ribs leading trailing edges -in balsa indicate balsa rib profiles Locate bellcrank centerline root rib drawing Find lead-out center line center position tip rib drawing two centerlines will de termine center front foam spar spar 0300 wide 0150 side centerline parallel either leading trailing edge aft foam spar should positioned halfway between bellcrank centerline trailing edge spar will parallel trailing edge 0300 wide airfoil foam support 0200 wide Lay out using same techniques laying out airfoil connect odel Aviation Authorwith completed foamcorewing perthisarticlefora imitation PrecislonAsrobatlcs model Its lIghtweight straight once have setup fasterto build framework wing Investment will about SlO materials 10 manhours first ALL dashed lines together Three cavities defined airfoil foam support leading edge front foam spar aft foam spar trailing edge should radius least oil foam support inner line turns foam spars m radius should both root rib tip rib stations See Photo 4 Make two copies rib drawing Cut out copy both root tip ribs airfoil shape cut out just rib cavities both root tip ribs other copy root tip templates can Masonite soft aluminum made cutouts source soft aluminum purpose aluminum siding used homes usually painted side kind aluminum can cut scissors Sanford Sharpie extra fine point marker about $1 office equip ment stores will mark Draw centerline aluminum Tape root rib cavity cutout aluminum centerlines aligned Draw around cutout edge same tip rib cavity cutout same process used making templates airfoil root tip templates must numbered along edge shown Photo 5 reference uniformly cutting foam Note numbers two patterns mirror images templates back back numbers will match up Cut out four aluminum templates lightly sand edges get smooth Getting smooth edges airfoil shape especially important edges rough nichrome cutting wire will slide smoothly first try doesnt produce templates smooth edges dis card make another set Foam used wings CL Precision Aerobatics models should have density pound per cubic foot piece shown pictures 4 thick Cut foam block inboard outboard wing April 1987 71 0 halves correct length tip root faces should perpendicular trailing edge face general procedure cut rib cavities first cut airfoil shape Tape rib cavity templates root tip foam block trace around felt-tip marker Youll have get nichrome cutting wire through length solid foam block An easy way through hole made drop wire jig constructed 3-ft length 2 x 4 wood three eye screws length -in piano wire Photo 6 shows jig construction idea heat end piano wiie blowtorch drop through length foam block three rib cavity locations suc cessfully everything must carefully aligned drop wire jig foam block must vertical check 3ft level Use drop wire first trailing edge center cavities hole through leading edge cavity last parallel leading edge wire should enter tip about ard front foam spar shown Photo 7 Tape pin cavity templates foam block Photo 8 must se curely attached prevent movement cutting Disassemble hot-wire cutter fish nichrome wire through holes made drop wire Reassemble cutter hold insulated part turn power person should end cutter guide hot wire properly idea person guide wire same relative position templates reason templates num bered see cutting operation progress Photo 9 easier generally person root airfoil end call out numbers aid person tip airfoil end maintaining same relative position may take couple tries get good coordination Turn off power after cavity has cut free let nichrome wire cool down careful burn yourrelfl Disassemble cutter wire repeatthis 72 Model Aviation process other two cavities finished remove cavity templates leave cavity cores place Tape pin airfoil templates place again see Photo 8 Careful align ment templates necessary assure airfoil foam support thickness will 0200 Cutting airfoil shape done numbers same way cavities cutting complete remove templates slip out cavity cores through root end course Once have finished examining masterpiece carefully slip cavity cores back place will flimsy Now comes installation ply wood spar cavity cores must place felt-tip marker trace front foam spar exterior surface airfoil will produce two parallel lines 0300 apart root tip both sides foam core -in plywood spar will go center 0300 lines length 8 m wing panel Draw lines ply spar within foam spar lines top bottom shown Photo 10 Cut slot -in ply spar hacksaw blade have taped end holding purposes carefullyjust 8 long Check slot right place both sides work Once cut ply spar finished measure airfoil thickness root 8 root dimensions hand can lay out spar cut two Lite Ply Make bellcrank cutouts lightening holes spar Photo 11 spar must fit snugly core falls through excess epoxy will needed gluing finished spar must flush foam core balsa skin can applied smoothiy spar properly sized epoxy place inboard foam core spar must inset allow room bellcrank bolt Epoxy leading trailing edges Cnntinud nn nno 167 April 1987 73 long-term effects will benefit fliers bring out worst everyone now its really worth go after big prizes may some new rules FAI Combat no sure what picture Greg Hills to-the-rules plane included viewing enjoyment model features Nemesisstyle construction using late-model Rossi power nicest features type model degree strength can built ultra-strong motor mounts used Rush Rudner can used well extra reinforc ing leading edge give opposition good whack 16-ounce models used would possible build really strong model since engines make up about four five ounces weight flying stresses arent high Fast model Could new style bump-and-run will develop FAI lot touch-the-ground-and-go before use remote needle assembly seems settle down setting engine besides getting needle far away prop Most people use OS 10 needle assembly either K&B Fox jet metal nylon bolt opposite-side hole Ive noticed latest trend leave hole openso model crashes quits some reason fuel will shoot out hole toward ground flood engine engine running velocity incoming air doesnt allow fuel spray out bottom side couple things arent exactly Combat items still worthy mention used got some sunglasses couple bucks besides looking cool killed some glare Now some really high-tech items market marvelous job filtering out bad rays Im sure theyd lot good pilots trying pick out opponents model against sky $30-$80 per pair would too expensive us evaluate enough make kind decision someone has experience variety glasses please write share information rest us Paul Smith has using audio tape record matches calls start flying style cuts kills etc course would spaced over tape happened sent transcript some matches held Hungary summer its possible reconstruct what going happen have small tape player might take along next meet try calling matches play back home chart what happened listen watch clock Its actually possibility instantreplay device could used contests Ive seen Speed guys use recorder could clock individual laps speed Charlie Johnson 3716 Ingraham St San Diego CA 92109 CL Foam Wings/Jennings Continued page 73 cores leading edge n strip balsa trailing edge also balsa ark centerline -in side trailing edge locates hinge line flaps Locate cut hinge slot trailing edge strips ATRPTN p-STAGE PRESSURE GUAGE MORE GOODIES CANOPY TRACK AIRPIN PRESS GUAGE CUSGUM AIR CYLINDERS PROPHUT/SPIRHER ATTACH EXT PROPSUES FOR -lO FI4U etc AIR OPERATED LATCH AThAS SOce ESGIRES STRONG OLD TINEN KITS SEND SASE FOR INFO DEAlER INQUIRES INVITED PHONE3O 731A1 1411 ICYLINDERS ROBINA IRE P0 B0X6766 LAKE WORTH FLORIDA 33466-0766 April1987 167 GEAR I4ECHANICS FOR NIGGlES CL-2 LATCH FOR COWL HATCH CANOPY & WINO pp p p1h g p BENTOM BROWN JH- CAMPHLLL COMET COVERITE COX DUBRO EASY BUILT MODELS ENYA FAF FLYLINE FOX GOLDBERG GOLDEN AGE REPRO GENE DUBOIS GUILLOW- K&B K&S L R MRC OS MAX PACTRA- PECK-POLYMER PERFECT R N MODELS SEAGLEN SIG STERLING SULLIVAN SUPER TIGRE TAFFINDER TELCO TOP FLITE- TREXLER WILLIAMS & OTHERS ESTES MODEL ROCKETS Send 1100 Csh Check Stanspa oar 44 page tabloid nice DISCOUNT Catalog 900 illustrations over 700 Kits choose MAILORDER PHONEORDER IN STORE PENN VALLEY HOllY CENTER 87 WMain St Lansdalsla19446 Problems lems Splitting thin ribs pinning Keeping ribs square vertical straight Strong glue joints Stop Dont ruin new airplane wing tail-2/ What Need Are NEW Joint Points come 5 slot sizes 1/16 3/32 1/8 3/16 1/4 2 Makes perfect strong joint Needs no pins Distributes point loading compression tension torque Ask Favorite Hobby Dealer forJOIflt Points Packagel2pcsea $119 Su-Pr-Line product AI-Tec Products Inc Sidney Ohio 5 Glue leading trailing edge strips thinly-spread epoxy Hold strips place tape epoxy sets Sand leading trailing edges correct shape must smooth transition foam core trailing edge balsa skin will overlap aid sanding balsa sanding foam tape piece lightweight cardboard such notebook divider over foam butted against balsa blocksand Photo 12 Probably will have replace cardboard several times before finished balsa smooth cardboard re -move cardboard carefully sand until balsa smooth foam balsa skin overlap leading edge balsa leading edge should sanded similar fashion An alternate method glue sand leading edge balsa after balsa skin has glued Preparatory skinning wing blocksand foam core lightly want smooth ridges Dont go overboard foam thin fragile Vacuum sanded foam core care skin will /16 sheet contest balsa Edge-glue enough sheets together get width necessary cover side Mix enough 45-mm epoxy cover two skins Apply epoxy skin use playing card spread remove excess just right balsa skin will damp epoxy Lightly coat trailing edge leading edge overlap plywood spar edge excess epoxy will add weight provide strength skins applied cavity cores place added rigidity Starting leading edge roll skin over core would same using contact cement instead epoxy same skin other side Place subassembly back outer core saddles sandwiched together add weights top outer core saddies compress everything epoxy curing Make bellcrank assembly lead-outs Bush lead-outs 6 brass tubing through bellcrank Slip leadout through 1-in length tubing Slide tubing through bellcrank bend tubing smooth radius Make leadout cable connections per AMA rule book see Photo 13 Assemble bellcrank pushrod must secured bellcrank way interfere movement Notch inboard wing bellcrank support pushrod exit pushrod should installed bends between flap horn bellcrank might require larger exit notch normal Epoxy bellcrank assembly inboard wing Make sure operation smooth before going further Both wing halves now ready epoxy together outer core saddles provide support alignment both inboard edges trim away excess balsa skin foam cores should square sanded Remove cavity cores Lightly coat foam cores balsa skin inboard edges 45-mm epoxy Position two edges together core saddies trailing edges must straight alignment Photo 14 Allow epoxy set Cut two x 1-in plywood bellcrank supports Drill through centers epoxy wing skin will give bellcmank area enough strength 40-lb pull tests wing butt joint must reinforced 1-in strips fiberglass Lay down fiberglass brush epoxy through Remove excess epoxy playing card keep weight down wing condition described should now weighed used competitive Precision Aerobatics aircraft should 8 oz wing too heavy think uses other com petitions likely reason- tooheavy wing use ofA6 balsa other lightweight contest variety Building foam-core wing CL Pre cision Aerobatics beyond capa bilities average modeler com pleted wing will use about $10 worth materials take about 10 manhours time Making templates takes about half time making additional wings same design can done about five hours foam-core wing general easier faster always straighter built-up wing Installing wing tips flaps part article thanks Bob Vogel good friend photographic hobbyist pictures article Fokker/M ichaels Continued page 83 wing covered same man ner Use piece MonoKote starting attaching top trailing edge wrapping around rear wing across bottom attaching leading edge material attached top surface handy MonoKote can cover wing tips along rest wing prefer cover tips first rest wing piece Glue three pennies tip weight right tip bottom wing tail surfaces made /it-in sheet balsa easy assemble rudder made three pieces wood grain running directions shown plans Building rudder way makes stronger made piece elevators joined piece /16-in music wire attached stab strip MonoKote ironed across top gap serve hinge sure gap between two pieces wide enough allow elevator deflect downwards well upwards 168 Model Aviation
Edition: Model Aviation - 1987/04
Page Numbers: 70, 71, 72, 73, 167, 168
MOST CLUBS have least expert building foam wings Paducah Aero modelers Paducah KY have Dave Paess ler makes beautiful foam wings RC models nobody has experience building foam wings CL aircraft article intended supply basic technology needed build CL Precision Aerobatics foam wing pro cedure two three times difficult foam wing RC uses Choice particular airfoil will dealt assumes have set plans airfoil already laid out Lets get right begin study Fig 1 names parts will foam-core wings alike arent really author provides some good how-to formation about foam-core wings Control Line Precision Aero batics models UT Michael Jennings discussed first step redraw root rib Youll need legal-sized 8 x 14 pad ruled paper usually yellow Draw centerline perpendicular lines pad Draw centerline through root rib plans Tape ruled paper over plans centerlines aligned make short dashed lines plan rib intersects lines ruled paper upper half rib see Photo 1 Measure centerline intersected ruled line use measure ment locate lower half rib technique will assure symmetrical airfoil Photo 2 Connect dashed lines together smooth curve Using same procedure make layout tip rib stage have outer profile both ribs leading trailing edges -in balsa indicate balsa rib profiles Locate bellcrank centerline root rib drawing Find lead-out center line center position tip rib drawing two centerlines will de termine center front foam spar spar 0300 wide 0150 side centerline parallel either leading trailing edge aft foam spar should positioned halfway between bellcrank centerline trailing edge spar will parallel trailing edge 0300 wide airfoil foam support 0200 wide Lay out using same techniques laying out airfoil connect odel Aviation Authorwith completed foamcorewing perthisarticlefora imitation PrecislonAsrobatlcs model Its lIghtweight straight once have setup fasterto build framework wing Investment will about SlO materials 10 manhours first ALL dashed lines together Three cavities defined airfoil foam support leading edge front foam spar aft foam spar trailing edge should radius least oil foam support inner line turns foam spars m radius should both root rib tip rib stations See Photo 4 Make two copies rib drawing Cut out copy both root tip ribs airfoil shape cut out just rib cavities both root tip ribs other copy root tip templates can Masonite soft aluminum made cutouts source soft aluminum purpose aluminum siding used homes usually painted side kind aluminum can cut scissors Sanford Sharpie extra fine point marker about $1 office equip ment stores will mark Draw centerline aluminum Tape root rib cavity cutout aluminum centerlines aligned Draw around cutout edge same tip rib cavity cutout same process used making templates airfoil root tip templates must numbered along edge shown Photo 5 reference uniformly cutting foam Note numbers two patterns mirror images templates back back numbers will match up Cut out four aluminum templates lightly sand edges get smooth Getting smooth edges airfoil shape especially important edges rough nichrome cutting wire will slide smoothly first try doesnt produce templates smooth edges dis card make another set Foam used wings CL Precision Aerobatics models should have density pound per cubic foot piece shown pictures 4 thick Cut foam block inboard outboard wing April 1987 71 0 halves correct length tip root faces should perpendicular trailing edge face general procedure cut rib cavities first cut airfoil shape Tape rib cavity templates root tip foam block trace around felt-tip marker Youll have get nichrome cutting wire through length solid foam block An easy way through hole made drop wire jig constructed 3-ft length 2 x 4 wood three eye screws length -in piano wire Photo 6 shows jig construction idea heat end piano wiie blowtorch drop through length foam block three rib cavity locations suc cessfully everything must carefully aligned drop wire jig foam block must vertical check 3ft level Use drop wire first trailing edge center cavities hole through leading edge cavity last parallel leading edge wire should enter tip about ard front foam spar shown Photo 7 Tape pin cavity templates foam block Photo 8 must se curely attached prevent movement cutting Disassemble hot-wire cutter fish nichrome wire through holes made drop wire Reassemble cutter hold insulated part turn power person should end cutter guide hot wire properly idea person guide wire same relative position templates reason templates num bered see cutting operation progress Photo 9 easier generally person root airfoil end call out numbers aid person tip airfoil end maintaining same relative position may take couple tries get good coordination Turn off power after cavity has cut free let nichrome wire cool down careful burn yourrelfl Disassemble cutter wire repeatthis 72 Model Aviation process other two cavities finished remove cavity templates leave cavity cores place Tape pin airfoil templates place again see Photo 8 Careful align ment templates necessary assure airfoil foam support thickness will 0200 Cutting airfoil shape done numbers same way cavities cutting complete remove templates slip out cavity cores through root end course Once have finished examining masterpiece carefully slip cavity cores back place will flimsy Now comes installation ply wood spar cavity cores must place felt-tip marker trace front foam spar exterior surface airfoil will produce two parallel lines 0300 apart root tip both sides foam core -in plywood spar will go center 0300 lines length 8 m wing panel Draw lines ply spar within foam spar lines top bottom shown Photo 10 Cut slot -in ply spar hacksaw blade have taped end holding purposes carefullyjust 8 long Check slot right place both sides work Once cut ply spar finished measure airfoil thickness root 8 root dimensions hand can lay out spar cut two Lite Ply Make bellcrank cutouts lightening holes spar Photo 11 spar must fit snugly core falls through excess epoxy will needed gluing finished spar must flush foam core balsa skin can applied smoothiy spar properly sized epoxy place inboard foam core spar must inset allow room bellcrank bolt Epoxy leading trailing edges Cnntinud nn nno 167 April 1987 73 long-term effects will benefit fliers bring out worst everyone now its really worth go after big prizes may some new rules FAI Combat no sure what picture Greg Hills to-the-rules plane included viewing enjoyment model features Nemesisstyle construction using late-model Rossi power nicest features type model degree strength can built ultra-strong motor mounts used Rush Rudner can used well extra reinforc ing leading edge give opposition good whack 16-ounce models used would possible build really strong model since engines make up about four five ounces weight flying stresses arent high Fast model Could new style bump-and-run will develop FAI lot touch-the-ground-and-go before use remote needle assembly seems settle down setting engine besides getting needle far away prop Most people use OS 10 needle assembly either K&B Fox jet metal nylon bolt opposite-side hole Ive noticed latest trend leave hole openso model crashes quits some reason fuel will shoot out hole toward ground flood engine engine running velocity incoming air doesnt allow fuel spray out bottom side couple things arent exactly Combat items still worthy mention used got some sunglasses couple bucks besides looking cool killed some glare Now some really high-tech items market marvelous job filtering out bad rays Im sure theyd lot good pilots trying pick out opponents model against sky $30-$80 per pair would too expensive us evaluate enough make kind decision someone has experience variety glasses please write share information rest us Paul Smith has using audio tape record matches calls start flying style cuts kills etc course would spaced over tape happened sent transcript some matches held Hungary summer its possible reconstruct what going happen have small tape player might take along next meet try calling matches play back home chart what happened listen watch clock Its actually possibility instantreplay device could used contests Ive seen Speed guys use recorder could clock individual laps speed Charlie Johnson 3716 Ingraham St San Diego CA 92109 CL Foam Wings/Jennings Continued page 73 cores leading edge n strip balsa trailing edge also balsa ark centerline -in side trailing edge locates hinge line flaps Locate cut hinge slot trailing edge strips ATRPTN p-STAGE PRESSURE GUAGE MORE GOODIES CANOPY TRACK AIRPIN PRESS GUAGE CUSGUM AIR CYLINDERS PROPHUT/SPIRHER ATTACH EXT PROPSUES FOR -lO FI4U etc AIR OPERATED LATCH AThAS SOce ESGIRES STRONG OLD TINEN KITS SEND SASE FOR INFO DEAlER INQUIRES INVITED PHONE3O 731A1 1411 ICYLINDERS ROBINA IRE P0 B0X6766 LAKE WORTH FLORIDA 33466-0766 April1987 167 GEAR I4ECHANICS FOR NIGGlES CL-2 LATCH FOR COWL HATCH CANOPY & WINO pp p p1h g p BENTOM BROWN JH- CAMPHLLL COMET COVERITE COX DUBRO EASY BUILT MODELS ENYA FAF FLYLINE FOX GOLDBERG GOLDEN AGE REPRO GENE DUBOIS GUILLOW- K&B K&S L R MRC OS MAX PACTRA- PECK-POLYMER PERFECT R N MODELS SEAGLEN SIG STERLING SULLIVAN SUPER TIGRE TAFFINDER TELCO TOP FLITE- TREXLER WILLIAMS & OTHERS ESTES MODEL ROCKETS Send 1100 Csh Check Stanspa oar 44 page tabloid nice DISCOUNT Catalog 900 illustrations over 700 Kits choose MAILORDER PHONEORDER IN STORE PENN VALLEY HOllY CENTER 87 WMain St Lansdalsla19446 Problems lems Splitting thin ribs pinning Keeping ribs square vertical straight Strong glue joints Stop Dont ruin new airplane wing tail-2/ What Need Are NEW Joint Points come 5 slot sizes 1/16 3/32 1/8 3/16 1/4 2 Makes perfect strong joint Needs no pins Distributes point loading compression tension torque Ask Favorite Hobby Dealer forJOIflt Points Packagel2pcsea $119 Su-Pr-Line product AI-Tec Products Inc Sidney Ohio 5 Glue leading trailing edge strips thinly-spread epoxy Hold strips place tape epoxy sets Sand leading trailing edges correct shape must smooth transition foam core trailing edge balsa skin will overlap aid sanding balsa sanding foam tape piece lightweight cardboard such notebook divider over foam butted against balsa blocksand Photo 12 Probably will have replace cardboard several times before finished balsa smooth cardboard re -move cardboard carefully sand until balsa smooth foam balsa skin overlap leading edge balsa leading edge should sanded similar fashion An alternate method glue sand leading edge balsa after balsa skin has glued Preparatory skinning wing blocksand foam core lightly want smooth ridges Dont go overboard foam thin fragile Vacuum sanded foam core care skin will /16 sheet contest balsa Edge-glue enough sheets together get width necessary cover side Mix enough 45-mm epoxy cover two skins Apply epoxy skin use playing card spread remove excess just right balsa skin will damp epoxy Lightly coat trailing edge leading edge overlap plywood spar edge excess epoxy will add weight provide strength skins applied cavity cores place added rigidity Starting leading edge roll skin over core would same using contact cement instead epoxy same skin other side Place subassembly back outer core saddles sandwiched together add weights top outer core saddies compress everything epoxy curing Make bellcrank assembly lead-outs Bush lead-outs 6 brass tubing through bellcrank Slip leadout through 1-in length tubing Slide tubing through bellcrank bend tubing smooth radius Make leadout cable connections per AMA rule book see Photo 13 Assemble bellcrank pushrod must secured bellcrank way interfere movement Notch inboard wing bellcrank support pushrod exit pushrod should installed bends between flap horn bellcrank might require larger exit notch normal Epoxy bellcrank assembly inboard wing Make sure operation smooth before going further Both wing halves now ready epoxy together outer core saddles provide support alignment both inboard edges trim away excess balsa skin foam cores should square sanded Remove cavity cores Lightly coat foam cores balsa skin inboard edges 45-mm epoxy Position two edges together core saddies trailing edges must straight alignment Photo 14 Allow epoxy set Cut two x 1-in plywood bellcrank supports Drill through centers epoxy wing skin will give bellcmank area enough strength 40-lb pull tests wing butt joint must reinforced 1-in strips fiberglass Lay down fiberglass brush epoxy through Remove excess epoxy playing card keep weight down wing condition described should now weighed used competitive Precision Aerobatics aircraft should 8 oz wing too heavy think uses other com petitions likely reason- tooheavy wing use ofA6 balsa other lightweight contest variety Building foam-core wing CL Pre cision Aerobatics beyond capa bilities average modeler com pleted wing will use about $10 worth materials take about 10 manhours time Making templates takes about half time making additional wings same design can done about five hours foam-core wing general easier faster always straighter built-up wing Installing wing tips flaps part article thanks Bob Vogel good friend photographic hobbyist pictures article Fokker/M ichaels Continued page 83 wing covered same man ner Use piece MonoKote starting attaching top trailing edge wrapping around rear wing across bottom attaching leading edge material attached top surface handy MonoKote can cover wing tips along rest wing prefer cover tips first rest wing piece Glue three pennies tip weight right tip bottom wing tail surfaces made /it-in sheet balsa easy assemble rudder made three pieces wood grain running directions shown plans Building rudder way makes stronger made piece elevators joined piece /16-in music wire attached stab strip MonoKote ironed across top gap serve hinge sure gap between two pieces wide enough allow elevator deflect downwards well upwards 168 Model Aviation
Edition: Model Aviation - 1987/04
Page Numbers: 70, 71, 72, 73, 167, 168
MOST CLUBS have least expert building foam wings Paducah Aero modelers Paducah KY have Dave Paess ler makes beautiful foam wings RC models nobody has experience building foam wings CL aircraft article intended supply basic technology needed build CL Precision Aerobatics foam wing pro cedure two three times difficult foam wing RC uses Choice particular airfoil will dealt assumes have set plans airfoil already laid out Lets get right begin study Fig 1 names parts will foam-core wings alike arent really author provides some good how-to formation about foam-core wings Control Line Precision Aero batics models UT Michael Jennings discussed first step redraw root rib Youll need legal-sized 8 x 14 pad ruled paper usually yellow Draw centerline perpendicular lines pad Draw centerline through root rib plans Tape ruled paper over plans centerlines aligned make short dashed lines plan rib intersects lines ruled paper upper half rib see Photo 1 Measure centerline intersected ruled line use measure ment locate lower half rib technique will assure symmetrical airfoil Photo 2 Connect dashed lines together smooth curve Using same procedure make layout tip rib stage have outer profile both ribs leading trailing edges -in balsa indicate balsa rib profiles Locate bellcrank centerline root rib drawing Find lead-out center line center position tip rib drawing two centerlines will de termine center front foam spar spar 0300 wide 0150 side centerline parallel either leading trailing edge aft foam spar should positioned halfway between bellcrank centerline trailing edge spar will parallel trailing edge 0300 wide airfoil foam support 0200 wide Lay out using same techniques laying out airfoil connect odel Aviation Authorwith completed foamcorewing perthisarticlefora imitation PrecislonAsrobatlcs model Its lIghtweight straight once have setup fasterto build framework wing Investment will about SlO materials 10 manhours first ALL dashed lines together Three cavities defined airfoil foam support leading edge front foam spar aft foam spar trailing edge should radius least oil foam support inner line turns foam spars m radius should both root rib tip rib stations See Photo 4 Make two copies rib drawing Cut out copy both root tip ribs airfoil shape cut out just rib cavities both root tip ribs other copy root tip templates can Masonite soft aluminum made cutouts source soft aluminum purpose aluminum siding used homes usually painted side kind aluminum can cut scissors Sanford Sharpie extra fine point marker about $1 office equip ment stores will mark Draw centerline aluminum Tape root rib cavity cutout aluminum centerlines aligned Draw around cutout edge same tip rib cavity cutout same process used making templates airfoil root tip templates must numbered along edge shown Photo 5 reference uniformly cutting foam Note numbers two patterns mirror images templates back back numbers will match up Cut out four aluminum templates lightly sand edges get smooth Getting smooth edges airfoil shape especially important edges rough nichrome cutting wire will slide smoothly first try doesnt produce templates smooth edges dis card make another set Foam used wings CL Precision Aerobatics models should have density pound per cubic foot piece shown pictures 4 thick Cut foam block inboard outboard wing April 1987 71 0 halves correct length tip root faces should perpendicular trailing edge face general procedure cut rib cavities first cut airfoil shape Tape rib cavity templates root tip foam block trace around felt-tip marker Youll have get nichrome cutting wire through length solid foam block An easy way through hole made drop wire jig constructed 3-ft length 2 x 4 wood three eye screws length -in piano wire Photo 6 shows jig construction idea heat end piano wiie blowtorch drop through length foam block three rib cavity locations suc cessfully everything must carefully aligned drop wire jig foam block must vertical check 3ft level Use drop wire first trailing edge center cavities hole through leading edge cavity last parallel leading edge wire should enter tip about ard front foam spar shown Photo 7 Tape pin cavity templates foam block Photo 8 must se curely attached prevent movement cutting Disassemble hot-wire cutter fish nichrome wire through holes made drop wire Reassemble cutter hold insulated part turn power person should end cutter guide hot wire properly idea person guide wire same relative position templates reason templates num bered see cutting operation progress Photo 9 easier generally person root airfoil end call out numbers aid person tip airfoil end maintaining same relative position may take couple tries get good coordination Turn off power after cavity has cut free let nichrome wire cool down careful burn yourrelfl Disassemble cutter wire repeatthis 72 Model Aviation process other two cavities finished remove cavity templates leave cavity cores place Tape pin airfoil templates place again see Photo 8 Careful align ment templates necessary assure airfoil foam support thickness will 0200 Cutting airfoil shape done numbers same way cavities cutting complete remove templates slip out cavity cores through root end course Once have finished examining masterpiece carefully slip cavity cores back place will flimsy Now comes installation ply wood spar cavity cores must place felt-tip marker trace front foam spar exterior surface airfoil will produce two parallel lines 0300 apart root tip both sides foam core -in plywood spar will go center 0300 lines length 8 m wing panel Draw lines ply spar within foam spar lines top bottom shown Photo 10 Cut slot -in ply spar hacksaw blade have taped end holding purposes carefullyjust 8 long Check slot right place both sides work Once cut ply spar finished measure airfoil thickness root 8 root dimensions hand can lay out spar cut two Lite Ply Make bellcrank cutouts lightening holes spar Photo 11 spar must fit snugly core falls through excess epoxy will needed gluing finished spar must flush foam core balsa skin can applied smoothiy spar properly sized epoxy place inboard foam core spar must inset allow room bellcrank bolt Epoxy leading trailing edges Cnntinud nn nno 167 April 1987 73 long-term effects will benefit fliers bring out worst everyone now its really worth go after big prizes may some new rules FAI Combat no sure what picture Greg Hills to-the-rules plane included viewing enjoyment model features Nemesisstyle construction using late-model Rossi power nicest features type model degree strength can built ultra-strong motor mounts used Rush Rudner can used well extra reinforc ing leading edge give opposition good whack 16-ounce models used would possible build really strong model since engines make up about four five ounces weight flying stresses arent high Fast model Could new style bump-and-run will develop FAI lot touch-the-ground-and-go before use remote needle assembly seems settle down setting engine besides getting needle far away prop Most people use OS 10 needle assembly either K&B Fox jet metal nylon bolt opposite-side hole Ive noticed latest trend leave hole openso model crashes quits some reason fuel will shoot out hole toward ground flood engine engine running velocity incoming air doesnt allow fuel spray out bottom side couple things arent exactly Combat items still worthy mention used got some sunglasses couple bucks besides looking cool killed some glare Now some really high-tech items market marvelous job filtering out bad rays Im sure theyd lot good pilots trying pick out opponents model against sky $30-$80 per pair would too expensive us evaluate enough make kind decision someone has experience variety glasses please write share information rest us Paul Smith has using audio tape record matches calls start flying style cuts kills etc course would spaced over tape happened sent transcript some matches held Hungary summer its possible reconstruct what going happen have small tape player might take along next meet try calling matches play back home chart what happened listen watch clock Its actually possibility instantreplay device could used contests Ive seen Speed guys use recorder could clock individual laps speed Charlie Johnson 3716 Ingraham St San Diego CA 92109 CL Foam Wings/Jennings Continued page 73 cores leading edge n strip balsa trailing edge also balsa ark centerline -in side trailing edge locates hinge line flaps Locate cut hinge slot trailing edge strips ATRPTN p-STAGE PRESSURE GUAGE MORE GOODIES CANOPY TRACK AIRPIN PRESS GUAGE CUSGUM AIR CYLINDERS PROPHUT/SPIRHER ATTACH EXT PROPSUES FOR -lO FI4U etc AIR OPERATED LATCH AThAS SOce ESGIRES STRONG OLD TINEN KITS SEND SASE FOR INFO DEAlER INQUIRES INVITED PHONE3O 731A1 1411 ICYLINDERS ROBINA IRE P0 B0X6766 LAKE WORTH FLORIDA 33466-0766 April1987 167 GEAR I4ECHANICS FOR NIGGlES CL-2 LATCH FOR COWL HATCH CANOPY & WINO pp p p1h g p BENTOM BROWN JH- CAMPHLLL COMET COVERITE COX DUBRO EASY BUILT MODELS ENYA FAF FLYLINE FOX GOLDBERG GOLDEN AGE REPRO GENE DUBOIS GUILLOW- K&B K&S L R MRC OS MAX PACTRA- PECK-POLYMER PERFECT R N MODELS SEAGLEN SIG STERLING SULLIVAN SUPER TIGRE TAFFINDER TELCO TOP FLITE- TREXLER WILLIAMS & OTHERS ESTES MODEL ROCKETS Send 1100 Csh Check Stanspa oar 44 page tabloid nice DISCOUNT Catalog 900 illustrations over 700 Kits choose MAILORDER PHONEORDER IN STORE PENN VALLEY HOllY CENTER 87 WMain St Lansdalsla19446 Problems lems Splitting thin ribs pinning Keeping ribs square vertical straight Strong glue joints Stop Dont ruin new airplane wing tail-2/ What Need Are NEW Joint Points come 5 slot sizes 1/16 3/32 1/8 3/16 1/4 2 Makes perfect strong joint Needs no pins Distributes point loading compression tension torque Ask Favorite Hobby Dealer forJOIflt Points Packagel2pcsea $119 Su-Pr-Line product AI-Tec Products Inc Sidney Ohio 5 Glue leading trailing edge strips thinly-spread epoxy Hold strips place tape epoxy sets Sand leading trailing edges correct shape must smooth transition foam core trailing edge balsa skin will overlap aid sanding balsa sanding foam tape piece lightweight cardboard such notebook divider over foam butted against balsa blocksand Photo 12 Probably will have replace cardboard several times before finished balsa smooth cardboard re -move cardboard carefully sand until balsa smooth foam balsa skin overlap leading edge balsa leading edge should sanded similar fashion An alternate method glue sand leading edge balsa after balsa skin has glued Preparatory skinning wing blocksand foam core lightly want smooth ridges Dont go overboard foam thin fragile Vacuum sanded foam core care skin will /16 sheet contest balsa Edge-glue enough sheets together get width necessary cover side Mix enough 45-mm epoxy cover two skins Apply epoxy skin use playing card spread remove excess just right balsa skin will damp epoxy Lightly coat trailing edge leading edge overlap plywood spar edge excess epoxy will add weight provide strength skins applied cavity cores place added rigidity Starting leading edge roll skin over core would same using contact cement instead epoxy same skin other side Place subassembly back outer core saddles sandwiched together add weights top outer core saddies compress everything epoxy curing Make bellcrank assembly lead-outs Bush lead-outs 6 brass tubing through bellcrank Slip leadout through 1-in length tubing Slide tubing through bellcrank bend tubing smooth radius Make leadout cable connections per AMA rule book see Photo 13 Assemble bellcrank pushrod must secured bellcrank way interfere movement Notch inboard wing bellcrank support pushrod exit pushrod should installed bends between flap horn bellcrank might require larger exit notch normal Epoxy bellcrank assembly inboard wing Make sure operation smooth before going further Both wing halves now ready epoxy together outer core saddles provide support alignment both inboard edges trim away excess balsa skin foam cores should square sanded Remove cavity cores Lightly coat foam cores balsa skin inboard edges 45-mm epoxy Position two edges together core saddies trailing edges must straight alignment Photo 14 Allow epoxy set Cut two x 1-in plywood bellcrank supports Drill through centers epoxy wing skin will give bellcmank area enough strength 40-lb pull tests wing butt joint must reinforced 1-in strips fiberglass Lay down fiberglass brush epoxy through Remove excess epoxy playing card keep weight down wing condition described should now weighed used competitive Precision Aerobatics aircraft should 8 oz wing too heavy think uses other com petitions likely reason- tooheavy wing use ofA6 balsa other lightweight contest variety Building foam-core wing CL Pre cision Aerobatics beyond capa bilities average modeler com pleted wing will use about $10 worth materials take about 10 manhours time Making templates takes about half time making additional wings same design can done about five hours foam-core wing general easier faster always straighter built-up wing Installing wing tips flaps part article thanks Bob Vogel good friend photographic hobbyist pictures article Fokker/M ichaels Continued page 83 wing covered same man ner Use piece MonoKote starting attaching top trailing edge wrapping around rear wing across bottom attaching leading edge material attached top surface handy MonoKote can cover wing tips along rest wing prefer cover tips first rest wing piece Glue three pennies tip weight right tip bottom wing tail surfaces made /it-in sheet balsa easy assemble rudder made three pieces wood grain running directions shown plans Building rudder way makes stronger made piece elevators joined piece /16-in music wire attached stab strip MonoKote ironed across top gap serve hinge sure gap between two pieces wide enough allow elevator deflect downwards well upwards 168 Model Aviation
Edition: Model Aviation - 1987/04
Page Numbers: 70, 71, 72, 73, 167, 168
MOST CLUBS have least expert building foam wings Paducah Aero modelers Paducah KY have Dave Paess ler makes beautiful foam wings RC models nobody has experience building foam wings CL aircraft article intended supply basic technology needed build CL Precision Aerobatics foam wing pro cedure two three times difficult foam wing RC uses Choice particular airfoil will dealt assumes have set plans airfoil already laid out Lets get right begin study Fig 1 names parts will foam-core wings alike arent really author provides some good how-to formation about foam-core wings Control Line Precision Aero batics models UT Michael Jennings discussed first step redraw root rib Youll need legal-sized 8 x 14 pad ruled paper usually yellow Draw centerline perpendicular lines pad Draw centerline through root rib plans Tape ruled paper over plans centerlines aligned make short dashed lines plan rib intersects lines ruled paper upper half rib see Photo 1 Measure centerline intersected ruled line use measure ment locate lower half rib technique will assure symmetrical airfoil Photo 2 Connect dashed lines together smooth curve Using same procedure make layout tip rib stage have outer profile both ribs leading trailing edges -in balsa indicate balsa rib profiles Locate bellcrank centerline root rib drawing Find lead-out center line center position tip rib drawing two centerlines will de termine center front foam spar spar 0300 wide 0150 side centerline parallel either leading trailing edge aft foam spar should positioned halfway between bellcrank centerline trailing edge spar will parallel trailing edge 0300 wide airfoil foam support 0200 wide Lay out using same techniques laying out airfoil connect odel Aviation Authorwith completed foamcorewing perthisarticlefora imitation PrecislonAsrobatlcs model Its lIghtweight straight once have setup fasterto build framework wing Investment will about SlO materials 10 manhours first ALL dashed lines together Three cavities defined airfoil foam support leading edge front foam spar aft foam spar trailing edge should radius least oil foam support inner line turns foam spars m radius should both root rib tip rib stations See Photo 4 Make two copies rib drawing Cut out copy both root tip ribs airfoil shape cut out just rib cavities both root tip ribs other copy root tip templates can Masonite soft aluminum made cutouts source soft aluminum purpose aluminum siding used homes usually painted side kind aluminum can cut scissors Sanford Sharpie extra fine point marker about $1 office equip ment stores will mark Draw centerline aluminum Tape root rib cavity cutout aluminum centerlines aligned Draw around cutout edge same tip rib cavity cutout same process used making templates airfoil root tip templates must numbered along edge shown Photo 5 reference uniformly cutting foam Note numbers two patterns mirror images templates back back numbers will match up Cut out four aluminum templates lightly sand edges get smooth Getting smooth edges airfoil shape especially important edges rough nichrome cutting wire will slide smoothly first try doesnt produce templates smooth edges dis card make another set Foam used wings CL Precision Aerobatics models should have density pound per cubic foot piece shown pictures 4 thick Cut foam block inboard outboard wing April 1987 71 0 halves correct length tip root faces should perpendicular trailing edge face general procedure cut rib cavities first cut airfoil shape Tape rib cavity templates root tip foam block trace around felt-tip marker Youll have get nichrome cutting wire through length solid foam block An easy way through hole made drop wire jig constructed 3-ft length 2 x 4 wood three eye screws length -in piano wire Photo 6 shows jig construction idea heat end piano wiie blowtorch drop through length foam block three rib cavity locations suc cessfully everything must carefully aligned drop wire jig foam block must vertical check 3ft level Use drop wire first trailing edge center cavities hole through leading edge cavity last parallel leading edge wire should enter tip about ard front foam spar shown Photo 7 Tape pin cavity templates foam block Photo 8 must se curely attached prevent movement cutting Disassemble hot-wire cutter fish nichrome wire through holes made drop wire Reassemble cutter hold insulated part turn power person should end cutter guide hot wire properly idea person guide wire same relative position templates reason templates num bered see cutting operation progress Photo 9 easier generally person root airfoil end call out numbers aid person tip airfoil end maintaining same relative position may take couple tries get good coordination Turn off power after cavity has cut free let nichrome wire cool down careful burn yourrelfl Disassemble cutter wire repeatthis 72 Model Aviation process other two cavities finished remove cavity templates leave cavity cores place Tape pin airfoil templates place again see Photo 8 Careful align ment templates necessary assure airfoil foam support thickness will 0200 Cutting airfoil shape done numbers same way cavities cutting complete remove templates slip out cavity cores through root end course Once have finished examining masterpiece carefully slip cavity cores back place will flimsy Now comes installation ply wood spar cavity cores must place felt-tip marker trace front foam spar exterior surface airfoil will produce two parallel lines 0300 apart root tip both sides foam core -in plywood spar will go center 0300 lines length 8 m wing panel Draw lines ply spar within foam spar lines top bottom shown Photo 10 Cut slot -in ply spar hacksaw blade have taped end holding purposes carefullyjust 8 long Check slot right place both sides work Once cut ply spar finished measure airfoil thickness root 8 root dimensions hand can lay out spar cut two Lite Ply Make bellcrank cutouts lightening holes spar Photo 11 spar must fit snugly core falls through excess epoxy will needed gluing finished spar must flush foam core balsa skin can applied smoothiy spar properly sized epoxy place inboard foam core spar must inset allow room bellcrank bolt Epoxy leading trailing edges Cnntinud nn nno 167 April 1987 73 long-term effects will benefit fliers bring out worst everyone now its really worth go after big prizes may some new rules FAI Combat no sure what picture Greg Hills to-the-rules plane included viewing enjoyment model features Nemesisstyle construction using late-model Rossi power nicest features type model degree strength can built ultra-strong motor mounts used Rush Rudner can used well extra reinforc ing leading edge give opposition good whack 16-ounce models used would possible build really strong model since engines make up about four five ounces weight flying stresses arent high Fast model Could new style bump-and-run will develop FAI lot touch-the-ground-and-go before use remote needle assembly seems settle down setting engine besides getting needle far away prop Most people use OS 10 needle assembly either K&B Fox jet metal nylon bolt opposite-side hole Ive noticed latest trend leave hole openso model crashes quits some reason fuel will shoot out hole toward ground flood engine engine running velocity incoming air doesnt allow fuel spray out bottom side couple things arent exactly Combat items still worthy mention used got some sunglasses couple bucks besides looking cool killed some glare Now some really high-tech items market marvelous job filtering out bad rays Im sure theyd lot good pilots trying pick out opponents model against sky $30-$80 per pair would too expensive us evaluate enough make kind decision someone has experience variety glasses please write share information rest us Paul Smith has using audio tape record matches calls start flying style cuts kills etc course would spaced over tape happened sent transcript some matches held Hungary summer its possible reconstruct what going happen have small tape player might take along next meet try calling matches play back home chart what happened listen watch clock Its actually possibility instantreplay device could used contests Ive seen Speed guys use recorder could clock individual laps speed Charlie Johnson 3716 Ingraham St San Diego CA 92109 CL Foam Wings/Jennings Continued page 73 cores leading edge n strip balsa trailing edge also balsa ark centerline -in side trailing edge locates hinge line flaps Locate cut hinge slot trailing edge strips ATRPTN p-STAGE PRESSURE GUAGE MORE GOODIES CANOPY TRACK AIRPIN PRESS GUAGE CUSGUM AIR CYLINDERS PROPHUT/SPIRHER ATTACH EXT PROPSUES FOR -lO FI4U etc AIR OPERATED LATCH AThAS SOce ESGIRES STRONG OLD TINEN KITS SEND SASE FOR INFO DEAlER INQUIRES INVITED PHONE3O 731A1 1411 ICYLINDERS ROBINA IRE P0 B0X6766 LAKE WORTH FLORIDA 33466-0766 April1987 167 GEAR I4ECHANICS FOR NIGGlES CL-2 LATCH FOR COWL HATCH CANOPY & WINO pp p p1h g p BENTOM BROWN JH- CAMPHLLL COMET COVERITE COX DUBRO EASY BUILT MODELS ENYA FAF FLYLINE FOX GOLDBERG GOLDEN AGE REPRO GENE DUBOIS GUILLOW- K&B K&S L R MRC OS MAX PACTRA- PECK-POLYMER PERFECT R N MODELS SEAGLEN SIG STERLING SULLIVAN SUPER TIGRE TAFFINDER TELCO TOP FLITE- TREXLER WILLIAMS & OTHERS ESTES MODEL ROCKETS Send 1100 Csh Check Stanspa oar 44 page tabloid nice DISCOUNT Catalog 900 illustrations over 700 Kits choose MAILORDER PHONEORDER IN STORE PENN VALLEY HOllY CENTER 87 WMain St Lansdalsla19446 Problems lems Splitting thin ribs pinning Keeping ribs square vertical straight Strong glue joints Stop Dont ruin new airplane wing tail-2/ What Need Are NEW Joint Points come 5 slot sizes 1/16 3/32 1/8 3/16 1/4 2 Makes perfect strong joint Needs no pins Distributes point loading compression tension torque Ask Favorite Hobby Dealer forJOIflt Points Packagel2pcsea $119 Su-Pr-Line product AI-Tec Products Inc Sidney Ohio 5 Glue leading trailing edge strips thinly-spread epoxy Hold strips place tape epoxy sets Sand leading trailing edges correct shape must smooth transition foam core trailing edge balsa skin will overlap aid sanding balsa sanding foam tape piece lightweight cardboard such notebook divider over foam butted against balsa blocksand Photo 12 Probably will have replace cardboard several times before finished balsa smooth cardboard re -move cardboard carefully sand until balsa smooth foam balsa skin overlap leading edge balsa leading edge should sanded similar fashion An alternate method glue sand leading edge balsa after balsa skin has glued Preparatory skinning wing blocksand foam core lightly want smooth ridges Dont go overboard foam thin fragile Vacuum sanded foam core care skin will /16 sheet contest balsa Edge-glue enough sheets together get width necessary cover side Mix enough 45-mm epoxy cover two skins Apply epoxy skin use playing card spread remove excess just right balsa skin will damp epoxy Lightly coat trailing edge leading edge overlap plywood spar edge excess epoxy will add weight provide strength skins applied cavity cores place added rigidity Starting leading edge roll skin over core would same using contact cement instead epoxy same skin other side Place subassembly back outer core saddles sandwiched together add weights top outer core saddies compress everything epoxy curing Make bellcrank assembly lead-outs Bush lead-outs 6 brass tubing through bellcrank Slip leadout through 1-in length tubing Slide tubing through bellcrank bend tubing smooth radius Make leadout cable connections per AMA rule book see Photo 13 Assemble bellcrank pushrod must secured bellcrank way interfere movement Notch inboard wing bellcrank support pushrod exit pushrod should installed bends between flap horn bellcrank might require larger exit notch normal Epoxy bellcrank assembly inboard wing Make sure operation smooth before going further Both wing halves now ready epoxy together outer core saddles provide support alignment both inboard edges trim away excess balsa skin foam cores should square sanded Remove cavity cores Lightly coat foam cores balsa skin inboard edges 45-mm epoxy Position two edges together core saddies trailing edges must straight alignment Photo 14 Allow epoxy set Cut two x 1-in plywood bellcrank supports Drill through centers epoxy wing skin will give bellcmank area enough strength 40-lb pull tests wing butt joint must reinforced 1-in strips fiberglass Lay down fiberglass brush epoxy through Remove excess epoxy playing card keep weight down wing condition described should now weighed used competitive Precision Aerobatics aircraft should 8 oz wing too heavy think uses other com petitions likely reason- tooheavy wing use ofA6 balsa other lightweight contest variety Building foam-core wing CL Pre cision Aerobatics beyond capa bilities average modeler com pleted wing will use about $10 worth materials take about 10 manhours time Making templates takes about half time making additional wings same design can done about five hours foam-core wing general easier faster always straighter built-up wing Installing wing tips flaps part article thanks Bob Vogel good friend photographic hobbyist pictures article Fokker/M ichaels Continued page 83 wing covered same man ner Use piece MonoKote starting attaching top trailing edge wrapping around rear wing across bottom attaching leading edge material attached top surface handy MonoKote can cover wing tips along rest wing prefer cover tips first rest wing piece Glue three pennies tip weight right tip bottom wing tail surfaces made /it-in sheet balsa easy assemble rudder made three pieces wood grain running directions shown plans Building rudder way makes stronger made piece elevators joined piece /16-in music wire attached stab strip MonoKote ironed across top gap serve hinge sure gap between two pieces wide enough allow elevator deflect downwards well upwards 168 Model Aviation