You Broke It!

You 89OK Think broken bird may beyond hope author found bent battered RC ship flying fields trash can model surgery techniques made whole strong again Per haps should look again fixing yours U Fred Berman Top picture 40-size Super Sportster ready fly again thanks authors convic tion model airplanes built repairable materials airplane formerly longed Joe Fife US Air captain also superb model painter repaired sur faces made blend original palntwork slight mismatch repaired area would noticed Scale judge Above Sportater looked rescued flying field trash can secret successful repair job pick up pieces CHEER UP Youre excellent company can does happen best us rational reasons otherwise Professed causes crashes could provide ample fuel hot-stove league least en tire winter Unlike Humpty-Dumpty however model airplanes constructed repar able materials So instead mourning dear departed lets borrow expression used TVs Betty Furness some 30 years ago look way save Al right alright spelled weigh difference talking about airplane talking about wash ing machine Believe such thing typical wreck Nearly always tail sec tion hapless unkit survives Usu ally fuselage breaks apart its weakest pointthe wing saddle As wing self half probably scrunched broken away other gener ally suffers little damage Depending angle impact nose may may have suffered crushing blow sixty-four-dollar question now comes worth fixing have senti 38 Model Aviation Len I ne porisiers iuseage oeing reassemoiea using ot original pieces possible fit ]igsaw puzzle back together Concrete gussets use carbon fiber discussed some detail text Right fuselage restored piece again New turtledeck stringers installed new wood added necessary butt joints strengthened carbon fiber inserts mental attachment balsa babies loathe see permanently dispatched Besides absolutely no purer joy watch ones flying minia ture marvel rise splinters take ozone extended lease life Does clue likely answer Following too familiar en counters model immovable object first recommendation pick up pieces Yes scrap can find Theres analogy jigsaw puzzle Its utterly amazing well matching sec tions can reassembled process closely examine break remove loose splinters could obstruct rejoining slide seg ments tightly together Make certain reassembled surface flat otherwise properly aligned apply thin CyA cyanoacrylate glue smoke clears piece will strong orig inal part Both cross-grain parallelgrain fractures may treated way Now well examine typical case its particularsmy bashed 40-size Super Sportster fuselage no compelling reason repaired first Damage assessment cracked half wing saddle broken five pieces turtledeck stringers broken wing mounting lugs associated bulkhead sep arated nose fuel tank compart ment well tail section intact owner basket case scrounged out trash barrel after its owner US Air Captain Joe Fife stripped control electronics out Joe much chagrin superb model painter Stripping away epoxy paint automotive primer expose dam aged wood proved tedious task Thus second recommendation expect have accidents use iron-on film covering rather paint comes off much easily event process clear reconstruction zone extrane ous materials next step work jigsaw puz zle five little broken pieces fuse lage soon became big piece care ful placement able rejoin fuse lage front back portions Yes know break areas need strengthened Thats coming least now struc ture again piece fracture area particular case too badly smashed sort procedure external stringers may glued place temporar ily hold everything together fill patches may added later Try get fuselage straight possible piece string stretched taut makes good alignment tool Use CyA cases Its mar velous stuff Butt joints inherently weaker lap joints Heres simple weightless bulkless way buttress butt joints make strongest part model Take No 13 X-Acto saw blade depending size fracture vein saw slits across reglued butt joint making about inch long Push properly sized pieces car bon fiber flush slits set CyA Any protruding carbon fiber can trimmed knife chisel proce dure has proved successful main spars wing leading edges skin re pairs inside fracture can backed up overlays carbon fiber 1/ ply /l6 hard balsa carbon fiber well balsa proper grain orientation important Both materials have ex cellent tensile strength parallel grain Let grain bridge frac ture Still have hole gap depression No problem Two repair methods disposal 1 insert 2 balsa concrete Theres no mystery about insert appli cation Carefully cut out bad material some regular repeatable shape triangle rectangle etc fabricate matching piece new wood Install set CyA October 1990 39 Left The left side fuselage showing concrete used badly frayed area new wood nothing left original Right new %-in ply servo platform installed new IA-in-sq balsa rails authors particular control system Left The concrete plant filler consists balsa dust filings compressed area repaired hardened soaking thin CyA must faired carefully preferably files much harder surrounding material Careless sanding will hog softer wood Right typical wing trailing edge repair insert new wood aileron hinge ripped out Left The jigsaw puzzle badly shattered wing being solved photo graphically illustrates importance retrieving pos sible piece broken bird its crash site Right bottom half same wing showing landing gear its supports completely ripped out Also note trailing edge shattered taking inner part aileron its control linkage may wondering does Encyclopedia Britannica define balsa con crete doesnt Thats classified informa tion G-2 tells us however formula nothing complex balsa dust and/or filings hardened thin CyA once theyre pressed place pro cedure works like magic Need fillet gusset kind void stuffer Take pinch dust/filings apply defi cient area Compress tightly using steel scale piece doweling whatever shape suits repair need Drop bit thin CyA keep nose out smoke Instantaneously have weightless bond Secret agents tell some imita tors use similar method substituting bak ing soda balsa dust would want half-baked joint Finishing concreteblending isrequires file Dont use sanding block hardened mix far sub stantial surrounding balsa smoothing shaping needs done care fully avoid hogging softer wood photos show some alchemy foisted subject Super Sportster Turtledeck stringer replacement rou tine rear terminus wing saddle needed new wood wing holddown lugs torn away also rou tine operation lug fastening area reinforced short pieces spruce trian gle stock cut out installed new A-in ply inertial guidance platform suit ing particular servos Such platform adds considerable rigidity wing sad dle dont know what original builder used fuselage disembow eled inherited restate fonnula Rejoin matching pieces Reattach broken sections ever weakly being critical alignment Reinforce later cutting out renewing severely damaged structural members Avoid addition weight during re pair process much possible past have taken some rather radi cal repair measures instance last year Aurora broke its back obvious re medial step graft tail back onto fuselage foresection using methods de scribed earlier However alignment turned out slightly askew because portion break didnt close back up completely remedy make vertical cut halfway through fuselage crooked side coping saw bend fuselage close gap thus bringing back alignment twice achieve correct alignment Once gap closed bandaged glass cloth medium CyA covered finger plastic wrap spread CyA through cloth After curingabout 15 minutesthe glass sur face filed sanded smooth Just record repair made 150 flights 23 glow plugs 81/2 gallons fuel ago Obviously Auroras recovery surgery complete its appetite glow plugs undiminished broken wing Sportster proved bit challenge because fuss ier damage left landing gear block ripped out crash taking two ribs piece lead ing edge part main spar unity wing halves literally bro ken Also left aileron shed about third its lengththe section course engaged torque rod Fortunately able retrieve missing piece strategy repairing wing same fuselage Attach main pieces separated best can make sure proper alignment re inforce repair bit little bit glued temporary splice plates across some broken joints plates can easily filed off after major repair com pleted Internal joint strengtheners ap 40 Model Aviation Left New nose ribs being Installed stiff paper cardboard pattern can made establish shape new rib pieces necessary Right Substructure repairs being made landing gear area Note new piece spliced effectively repair broken lower spar Len The grafted aileron reinstalled new hinges repaired trailing edge Though visible torque rod also place Right landing gear channel has replaced new wood inserts added arrows point concrete filler surrounding areas plied simply lapping carbon fiber thin ply balsa look some pho tos shows neatly breaks can fit ted together againa leading edge broken two places main spar mutilated trailing edge amputated precautionary tip kits such MK Aurora come fully shaped sanded ribs detailed plans Ive found wise make dupli cate outline sketches rib before building file possible future re ference expedient has served well though go flight fully confident shall never crash least no often anyone else no drawings Sportster no problem come up pattern ersatz rib noses needed shape up wing little try-and-cutting piece light cardboard did trick lap-jointed repair piece past broken end rib stubble thus displacing nose rib side ways thickness rib Y32 sort asymmetry hurts nothing sures strong repair cardboard pattern also served helping generate ply stiffeners supporting landing gear rails broken main spar prepared first cutting away shredded material form square cut new insert piece matched installed along carbon fiber ply method described earlier addi tional strength like shear web truss-type stiffening between upper lower spars Since original wing took opportu nity augment design accordingly similar insert restored integrity trailing edge Cutting new hinge slot epoxying torque rod knee allowed reattachment broken aileron seg ment fracture face butted beautifully insurance added carbon fiber splint Resheeting scalped wing cover step too simple warrant honorable mention excepting say used medium CyA Surface covering repair beautiful paint job undamaged part mod el plus daunting task having re move hunting new solution found film covering closely approximat ing original orange paint plane match isnt perfect distance four feet difference shading indistin guishable painted white accent stripes star star-burst decora tions precisely re-created using Mono Kote True Scale judge eyeballing model inches face would find fault nonhomogenous covering repair meth od difference covering two wings inconspicuous enough out flying field fellow modelers told after incorporated partial subversion before mis match color hue patched fuselace equally minute Conclusion Colored iron-on film will peacefully coexist painted surfaces Postoperative flight tests flawless Though original undamaged painted wing half considerably heavier film-covered repaired half didnt create problems flight rigorous shakedown test complete spins snap rolls confirmed integrity re pair well models indifference slight imbalance about nose tail axis Like cats model airplanes have life no should know better ultraexperienced author Just recently able brighten day new club member An obliging test pi lot giving novices plane its first flight misfortune meeting up 31M third order intermodulation devil taking off power dive altitude six feet created expected Continued page 153 October 1990 41 Radio Technique/Myers Continued page 36 Teaser 5 Can AM transmitters fly FM re ceivers vice versa several readers RC systems advertised being AM encode information switching On/Off hence radi ated power changes frequency 72xxx MHz 0 MHz FM systems shift between two frequencies about 5 kHz apart ie 72xxx 72xx5 MHz FM shift harder detect might expect Therefore likely FM receiver will controlled AM trans mitter AM receiver will con trolled FM transmitter Having said can now tell last receiver tested narrow-band AM re ceiver ground range 50 paces AM synthesizer 50 paces FM syn thesizer Kraft multifrequency transmitter Nature AM Lightning strikes corona around high-voltage transmission lines arc weld ers plastic bag sealers ignition systems gas oline engines clattering metal-to-metal parts produce AM-type signals George Steiner tests receivers AM FM sensitivity both on-channel off-channel data shows FM RC receivers actually sensitive off-channel AM transmitters off-channel FM transmitters reason power sidebands narrow-band AM transmitter sidebands narrow-band FM transmitter Whether AM transmitter will/wont fly FM receiver vice versa depends encod ing decoding methods case PCM pulse-code modulationEd receiver onchannel transmissions will put receiver its fail-safe mode because code will wrong case PWM pulse-width modula tionEd receivers may/may con trolled other kind transmitter de pending decoder works whether frame times pulse positions num ber channels match Airtronics 92xxx FM receiver instance completely immune AM transmitters tests Broke It/Berman Continued page 41 balsa mess Examining disaster fig uring quite typical advised new member plane can saved As instructed patiently picked up pieces Just week later jubilantly back field ready next check flight completely recov ered extensively damaged airplane As Navy Captain James Lawrence pleaded after being mortally wounded Boston Har bor 1813 Dont give up ship likely can live fly another lay little patience bottle CyA RC Soaring/Blakeslee Continued page 45 -scale plans workmanship Glider absolutely flawless detail Id have say finest Scale Glider Ive ever seen compared Erics Grunau Baby Baby Bowlus both flew last year Unfortu nately Kranich also too light try Fridayplus fact Eric zero flights Better save another day museum Friday night winc-tasting hors doeuvres social sponsored Charlie Morey editor/publisher Slope Soaring News very nice time talking Gliders al though large crowd made things bit snug must say Washington State vintages very tasty lot interest watching videos shot during day Saturday dawned nary ripple Co lumbia Most pilots hung around hotel waiting word slope would used Eagle Kiona Butte up Benton City mid morning nobody could stand waiting longer everybody took off slope other started Eagle met convoy coming down hill word Kiona later heard some guys stayed Eagle flew us ing winches Kiona big hill has advantage graveled road way up Eagle terribly dusty doesnt have big landing area Eagle breeze very light north however some thermals coming through Bill Liscomb DG 202 specked out arrived about noon what little wind stopped altogether few planes air slope lift petered out pilots tried trick book get high enough land near top hill No luck kept getting smaller smaller finally landed bottom looking like specks landed damage heard later Everyone took advantage lull talk about flying look over others lat est projects special guest speaker Saturday eve ning banquet Michael Selig Michael talked showed slides about Princeton wind tun nel tests John Donovan David Fraser performed August 1986 through Jan uary 1989 results published Herk Stokely Soartech 8 Airfoils Low Speeds course everyone edge seat waiting Seligs Seven Special Se crets designing cant-miss contestwinning Glider Michael obliged going through detailed explanations what feels important points Glider design quick summary 1 Pick good airfoil type flying Glider intended stick Minor vari ations can tried get used 2 wing pylon like Rich Spicers Syn ergy III efficient cut Out fit fuselage 3 Use fully sheeted wings because airfoil truer 4 wing tips half-crescent shape top surface shaped sharp edge like trail ing edge best 5 A small outer wing panel tipped up about 250 good like Falcon 880 6 Use straight trailing edge should also sharp 7 Use springy wing joiner idea joiner act like shock absorber wind gusts have less effect plane will easier fly Thanks Michael great presentation Following Michaels talk huge drawing door prizes Everybody got something Hobby Dynamics donated three JR Max radios Beemer R/C West Multiplex radio Im sure attendees appreciated receiving door Learn pros Top Flite details clear easy-to-follow full-color close up action Wings Fuselage Trims Color-on-color Designs Hinging Basic through advanced heat gun iron usage techniques tape approximately 1 hour MONOKOIIa Basics Wings Tail Sections Fuselages Hinging Color Schemes Trimming MONOXOTE II Advanced Color Schemes Designs Wing Tips Multi-Color Combos MORE MONOKOII 1W Airframe Prep Advanced Wing Tips Hinging Color-on-Color Graphics Painting MORE MONOKO1E Iv Wing Tips Canopy Covering Advanced Graphics Striping Car Bodies MORE MONOKOTE V Detailing Chrome Scale Tips Concave Surfaces Fragile Wing Tips MORE GREAT FOR CLUB MEETINGS RENT OR BUY $3995 $20 Refund per tape Rentals returned undamaged within 30 days Please specify 111111 IV orVwith order SPECIAL PURCHASE ONLY COMBO OFFER Combination 2-hour long tapes Specify & II Ill & IV Only $65 Save $1490 Sorry no rentals available Combo tapes Send check MO Name Full Address choice VHS BETA format TOP FLITE MODEI$ INC Monokote Video Course 2635 S Wabash Ave Chicago IL 60616 October 1990 153

You 89OK Think broken bird may beyond hope author found bent battered RC ship flying fields trash can model surgery techniques made whole strong again Per haps should look again fixing yours U Fred Berman Top picture 40-size Super Sportster ready fly again thanks authors convic tion model airplanes built repairable materials airplane formerly longed Joe Fife US Air captain also superb model painter repaired sur faces made blend original palntwork slight mismatch repaired area would noticed Scale judge Above Sportater looked rescued flying field trash can secret successful repair job pick up pieces CHEER UP Youre excellent company can does happen best us rational reasons otherwise Professed causes crashes could provide ample fuel hot-stove league least en tire winter Unlike Humpty-Dumpty however model airplanes constructed repar able materials So instead mourning dear departed lets borrow expression used TVs Betty Furness some 30 years ago look way save Al right alright spelled weigh difference talking about airplane talking about wash ing machine Believe such thing typical wreck Nearly always tail sec tion hapless unkit survives Usu ally fuselage breaks apart its weakest pointthe wing saddle As wing self half probably scrunched broken away other gener ally suffers little damage Depending angle impact nose may may have suffered crushing blow sixty-four-dollar question now comes worth fixing have senti 38 Model Aviation Len I ne porisiers iuseage oeing reassemoiea using ot original pieces possible fit ]igsaw puzzle back together Concrete gussets use carbon fiber discussed some detail text Right fuselage restored piece again New turtledeck stringers installed new wood added necessary butt joints strengthened carbon fiber inserts mental attachment balsa babies loathe see permanently dispatched Besides absolutely no purer joy watch ones flying minia ture marvel rise splinters take ozone extended lease life Does clue likely answer Following too familiar en counters model immovable object first recommendation pick up pieces Yes scrap can find Theres analogy jigsaw puzzle Its utterly amazing well matching sec tions can reassembled process closely examine break remove loose splinters could obstruct rejoining slide seg ments tightly together Make certain reassembled surface flat otherwise properly aligned apply thin CyA cyanoacrylate glue smoke clears piece will strong orig inal part Both cross-grain parallelgrain fractures may treated way Now well examine typical case its particularsmy bashed 40-size Super Sportster fuselage no compelling reason repaired first Damage assessment cracked half wing saddle broken five pieces turtledeck stringers broken wing mounting lugs associated bulkhead sep arated nose fuel tank compart ment well tail section intact owner basket case scrounged out trash barrel after its owner US Air Captain Joe Fife stripped control electronics out Joe much chagrin superb model painter Stripping away epoxy paint automotive primer expose dam aged wood proved tedious task Thus second recommendation expect have accidents use iron-on film covering rather paint comes off much easily event process clear reconstruction zone extrane ous materials next step work jigsaw puz zle five little broken pieces fuse lage soon became big piece care ful placement able rejoin fuse lage front back portions Yes know break areas need strengthened Thats coming least now struc ture again piece fracture area particular case too badly smashed sort procedure external stringers may glued place temporar ily hold everything together fill patches may added later Try get fuselage straight possible piece string stretched taut makes good alignment tool Use CyA cases Its mar velous stuff Butt joints inherently weaker lap joints Heres simple weightless bulkless way buttress butt joints make strongest part model Take No 13 X-Acto saw blade depending size fracture vein saw slits across reglued butt joint making about inch long Push properly sized pieces car bon fiber flush slits set CyA Any protruding carbon fiber can trimmed knife chisel proce dure has proved successful main spars wing leading edges skin re pairs inside fracture can backed up overlays carbon fiber 1/ ply /l6 hard balsa carbon fiber well balsa proper grain orientation important Both materials have ex cellent tensile strength parallel grain Let grain bridge frac ture Still have hole gap depression No problem Two repair methods disposal 1 insert 2 balsa concrete Theres no mystery about insert appli cation Carefully cut out bad material some regular repeatable shape triangle rectangle etc fabricate matching piece new wood Install set CyA October 1990 39 Left The left side fuselage showing concrete used badly frayed area new wood nothing left original Right new %-in ply servo platform installed new IA-in-sq balsa rails authors particular control system Left The concrete plant filler consists balsa dust filings compressed area repaired hardened soaking thin CyA must faired carefully preferably files much harder surrounding material Careless sanding will hog softer wood Right typical wing trailing edge repair insert new wood aileron hinge ripped out Left The jigsaw puzzle badly shattered wing being solved photo graphically illustrates importance retrieving pos sible piece broken bird its crash site Right bottom half same wing showing landing gear its supports completely ripped out Also note trailing edge shattered taking inner part aileron its control linkage may wondering does Encyclopedia Britannica define balsa con crete doesnt Thats classified informa tion G-2 tells us however formula nothing complex balsa dust and/or filings hardened thin CyA once theyre pressed place pro cedure works like magic Need fillet gusset kind void stuffer Take pinch dust/filings apply defi cient area Compress tightly using steel scale piece doweling whatever shape suits repair need Drop bit thin CyA keep nose out smoke Instantaneously have weightless bond Secret agents tell some imita tors use similar method substituting bak ing soda balsa dust would want half-baked joint Finishing concreteblending isrequires file Dont use sanding block hardened mix far sub stantial surrounding balsa smoothing shaping needs done care fully avoid hogging softer wood photos show some alchemy foisted subject Super Sportster Turtledeck stringer replacement rou tine rear terminus wing saddle needed new wood wing holddown lugs torn away also rou tine operation lug fastening area reinforced short pieces spruce trian gle stock cut out installed new A-in ply inertial guidance platform suit ing particular servos Such platform adds considerable rigidity wing sad dle dont know what original builder used fuselage disembow eled inherited restate fonnula Rejoin matching pieces Reattach broken sections ever weakly being critical alignment Reinforce later cutting out renewing severely damaged structural members Avoid addition weight during re pair process much possible past have taken some rather radi cal repair measures instance last year Aurora broke its back obvious re medial step graft tail back onto fuselage foresection using methods de scribed earlier However alignment turned out slightly askew because portion break didnt close back up completely remedy make vertical cut halfway through fuselage crooked side coping saw bend fuselage close gap thus bringing back alignment twice achieve correct alignment Once gap closed bandaged glass cloth medium CyA covered finger plastic wrap spread CyA through cloth After curingabout 15 minutesthe glass sur face filed sanded smooth Just record repair made 150 flights 23 glow plugs 81/2 gallons fuel ago Obviously Auroras recovery surgery complete its appetite glow plugs undiminished broken wing Sportster proved bit challenge because fuss ier damage left landing gear block ripped out crash taking two ribs piece lead ing edge part main spar unity wing halves literally bro ken Also left aileron shed about third its lengththe section course engaged torque rod Fortunately able retrieve missing piece strategy repairing wing same fuselage Attach main pieces separated best can make sure proper alignment re inforce repair bit little bit glued temporary splice plates across some broken joints plates can easily filed off after major repair com pleted Internal joint strengtheners ap 40 Model Aviation Left New nose ribs being Installed stiff paper cardboard pattern can made establish shape new rib pieces necessary Right Substructure repairs being made landing gear area Note new piece spliced effectively repair broken lower spar Len The grafted aileron reinstalled new hinges repaired trailing edge Though visible torque rod also place Right landing gear channel has replaced new wood inserts added arrows point concrete filler surrounding areas plied simply lapping carbon fiber thin ply balsa look some pho tos shows neatly breaks can fit ted together againa leading edge broken two places main spar mutilated trailing edge amputated precautionary tip kits such MK Aurora come fully shaped sanded ribs detailed plans Ive found wise make dupli cate outline sketches rib before building file possible future re ference expedient has served well though go flight fully confident shall never crash least no often anyone else no drawings Sportster no problem come up pattern ersatz rib noses needed shape up wing little try-and-cutting piece light cardboard did trick lap-jointed repair piece past broken end rib stubble thus displacing nose rib side ways thickness rib Y32 sort asymmetry hurts nothing sures strong repair cardboard pattern also served helping generate ply stiffeners supporting landing gear rails broken main spar prepared first cutting away shredded material form square cut new insert piece matched installed along carbon fiber ply method described earlier addi tional strength like shear web truss-type stiffening between upper lower spars Since original wing took opportu nity augment design accordingly similar insert restored integrity trailing edge Cutting new hinge slot epoxying torque rod knee allowed reattachment broken aileron seg ment fracture face butted beautifully insurance added carbon fiber splint Resheeting scalped wing cover step too simple warrant honorable mention excepting say used medium CyA Surface covering repair beautiful paint job undamaged part mod el plus daunting task having re move hunting new solution found film covering closely approximat ing original orange paint plane match isnt perfect distance four feet difference shading indistin guishable painted white accent stripes star star-burst decora tions precisely re-created using Mono Kote True Scale judge eyeballing model inches face would find fault nonhomogenous covering repair meth od difference covering two wings inconspicuous enough out flying field fellow modelers told after incorporated partial subversion before mis match color hue patched fuselace equally minute Conclusion Colored iron-on film will peacefully coexist painted surfaces Postoperative flight tests flawless Though original undamaged painted wing half considerably heavier film-covered repaired half didnt create problems flight rigorous shakedown test complete spins snap rolls confirmed integrity re pair well models indifference slight imbalance about nose tail axis Like cats model airplanes have life no should know better ultraexperienced author Just recently able brighten day new club member An obliging test pi lot giving novices plane its first flight misfortune meeting up 31M third order intermodulation devil taking off power dive altitude six feet created expected Continued page 153 October 1990 41 Radio Technique/Myers Continued page 36 Teaser 5 Can AM transmitters fly FM re ceivers vice versa several readers RC systems advertised being AM encode information switching On/Off hence radi ated power changes frequency 72xxx MHz 0 MHz FM systems shift between two frequencies about 5 kHz apart ie 72xxx 72xx5 MHz FM shift harder detect might expect Therefore likely FM receiver will controlled AM trans mitter AM receiver will con trolled FM transmitter Having said can now tell last receiver tested narrow-band AM re ceiver ground range 50 paces AM synthesizer 50 paces FM syn thesizer Kraft multifrequency transmitter Nature AM Lightning strikes corona around high-voltage transmission lines arc weld ers plastic bag sealers ignition systems gas oline engines clattering metal-to-metal parts produce AM-type signals George Steiner tests receivers AM FM sensitivity both on-channel off-channel data shows FM RC receivers actually sensitive off-channel AM transmitters off-channel FM transmitters reason power sidebands narrow-band AM transmitter sidebands narrow-band FM transmitter Whether AM transmitter will/wont fly FM receiver vice versa depends encod ing decoding methods case PCM pulse-code modulationEd receiver onchannel transmissions will put receiver its fail-safe mode because code will wrong case PWM pulse-width modula tionEd receivers may/may con trolled other kind transmitter de pending decoder works whether frame times pulse positions num ber channels match Airtronics 92xxx FM receiver instance completely immune AM transmitters tests Broke It/Berman Continued page 41 balsa mess Examining disaster fig uring quite typical advised new member plane can saved As instructed patiently picked up pieces Just week later jubilantly back field ready next check flight completely recov ered extensively damaged airplane As Navy Captain James Lawrence pleaded after being mortally wounded Boston Har bor 1813 Dont give up ship likely can live fly another lay little patience bottle CyA RC Soaring/Blakeslee Continued page 45 -scale plans workmanship Glider absolutely flawless detail Id have say finest Scale Glider Ive ever seen compared Erics Grunau Baby Baby Bowlus both flew last year Unfortu nately Kranich also too light try Fridayplus fact Eric zero flights Better save another day museum Friday night winc-tasting hors doeuvres social sponsored Charlie Morey editor/publisher Slope Soaring News very nice time talking Gliders al though large crowd made things bit snug must say Washington State vintages very tasty lot interest watching videos shot during day Saturday dawned nary ripple Co lumbia Most pilots hung around hotel waiting word slope would used Eagle Kiona Butte up Benton City mid morning nobody could stand waiting longer everybody took off slope other started Eagle met convoy coming down hill word Kiona later heard some guys stayed Eagle flew us ing winches Kiona big hill has advantage graveled road way up Eagle terribly dusty doesnt have big landing area Eagle breeze very light north however some thermals coming through Bill Liscomb DG 202 specked out arrived about noon what little wind stopped altogether few planes air slope lift petered out pilots tried trick book get high enough land near top hill No luck kept getting smaller smaller finally landed bottom looking like specks landed damage heard later Everyone took advantage lull talk about flying look over others lat est projects special guest speaker Saturday eve ning banquet Michael Selig Michael talked showed slides about Princeton wind tun nel tests John Donovan David Fraser performed August 1986 through Jan uary 1989 results published Herk Stokely Soartech 8 Airfoils Low Speeds course everyone edge seat waiting Seligs Seven Special Se crets designing cant-miss contestwinning Glider Michael obliged going through detailed explanations what feels important points Glider design quick summary 1 Pick good airfoil type flying Glider intended stick Minor vari ations can tried get used 2 wing pylon like Rich Spicers Syn ergy III efficient cut Out fit fuselage 3 Use fully sheeted wings because airfoil truer 4 wing tips half-crescent shape top surface shaped sharp edge like trail ing edge best 5 A small outer wing panel tipped up about 250 good like Falcon 880 6 Use straight trailing edge should also sharp 7 Use springy wing joiner idea joiner act like shock absorber wind gusts have less effect plane will easier fly Thanks Michael great presentation Following Michaels talk huge drawing door prizes Everybody got something Hobby Dynamics donated three JR Max radios Beemer R/C West Multiplex radio Im sure attendees appreciated receiving door Learn pros Top Flite details clear easy-to-follow full-color close up action Wings Fuselage Trims Color-on-color Designs Hinging Basic through advanced heat gun iron usage techniques tape approximately 1 hour MONOKOIIa Basics Wings Tail Sections Fuselages Hinging Color Schemes Trimming MONOXOTE II Advanced Color Schemes Designs Wing Tips Multi-Color Combos MORE MONOKOII 1W Airframe Prep Advanced Wing Tips Hinging Color-on-Color Graphics Painting MORE MONOKO1E Iv Wing Tips Canopy Covering Advanced Graphics Striping Car Bodies MORE MONOKOTE V Detailing Chrome Scale Tips Concave Surfaces Fragile Wing Tips MORE GREAT FOR CLUB MEETINGS RENT OR BUY $3995 $20 Refund per tape Rentals returned undamaged within 30 days Please specify 111111 IV orVwith order SPECIAL PURCHASE ONLY COMBO OFFER Combination 2-hour long tapes Specify & II Ill & IV Only $65 Save $1490 Sorry no rentals available Combo tapes Send check MO Name Full Address choice VHS BETA format TOP FLITE MODEI$ INC Monokote Video Course 2635 S Wabash Ave Chicago IL 60616 October 1990 153