FFWC Technical: F1A Glider

FFWC TECHNICA EMartyn Cowley FlA Glider CHINESE CHAMPIONS models flown winning pair Yue Liang Kai Sun may have looked like tradition ally-constructed gliders beneath surface Chinese have made consider able use carbon fiber structural rein forcement main spar has pre-cured unidirectional caps typically 012 thick top 006 beneath wood used actually tung Chinese equivalent balsa being little denser used thinner sizes compensate covering bamboo paper has long fibers make stronger regular tissue applied dry doped ever being water-shrunk avoid warps airfoil used modified Rabic appears almost identical So kolov has thread turbulator 9% calm conditions Livno Chinese using timer-operated variable-inci dence tails give additional 20 inci dence during circle towwhich activated immediately upon release new World Champion Yue Liang using revolutionary type circle tow hook fitted impulse latch truly original mechanism makes accidental un latching due high wind gusts quite impossible offers first major im provement since original Russian hook Chinese hooks have incorporated mass pendulums years Now Liang has developed concept blocking opening latch roller moved inertia small pendulum triggered sudden upward accelera tion model instant zoom launch release ingenious highly effective Advances wing construction Without doubt area greatest progress F lA glider seen Livno widespread use innovative composite construction deed year trend encompassed three classes making 1985 Composite Champs Use carbon Kevlar fiberglass lightweight rigid foam plas tics allowing greater design4reedomThe benefits greater strengthid stilThess often reduction weight As werent enough quite often significant reduction building time say nothing increased accuracy repro ducibiity molds used Russian Kevlar D-box wings Trend-set ters Nordic over decade Russian glider fliers again pushing forward frontiers model design huge high aspect ratio wings utilizing Kevlar D-box construction Victor Isaenko famous sliding-plate tow hookand 1975 Champ Victor Tchop models 87-in 97-in span flew throughout event Isaenkos 97-in-span model has root chord 59 straight taper tip 39 airfoil 65% thick yet wing torsionally very stiff 63 oz extremely light such long wing Such model simply could built remain rigid enough fast zoom launches through out turbulent midday conditions resort such materials Using con struction technique already ex perimenting similar wings using airfoils less 4% thickness Wait until see zoom launch glide nextgeneration models D-box leading edge structure con sists two laminations 35 oz/sq yd Kevlar 450 resulting thickness 010 no balsa sheeting beneath Kevlar cleverly laid up wet epoxy inside V-shaped mold inLeft look Inside fuselage Ailard van Wallenes models reveals neat installation increasIngly-popular electronic timers Right prototype electronic timer wIth radio locator beacon Jim Bradley could become commercIally-avaIlable later thIs year 56 Model Aviation Shown both latched unlatched positions Vue Liangs unique Impulse-latched circle tow hook will accidently release wInd think instrumen tal first-place finish 1985 FF World Championships photos author Few can disagree modelers TiES other lands leading way high ech Free Flight innovations re corporates leading edge radius 040 After initial curing Keviar V flexible enough accommodate upper lower surface camber glued around ribs front spar con tinuous piece conjunction carbon fiber caps spars individual rib Russians have developed port last years World Champion ships gives look some things have put front maintain airfoil making construction much simpler quicker Allard makes molds 2 lb/cu ft Styrofoam 2 thick hot-wire cuts produce upper lower surface molds glass cloth wetted Left Portable chart recorder plots temperature wind speed twin sensors allow prediction thermal activity Its hard argue Its necessary belongs new Wakefield World Champion Reiner Hofasas Right engineering masterpiece Russias AieksandrAndrukov has cam-operated variable-pitch prop fully-feathered delayed prop release maximize javelin-type launch remarkably elegant structure may yet join hook standard equipment Nordic flier Ribless sandwich-skin wings years Dutch particular have favored sheeted-wing gliders similar Power mod el construction Now Aliard van Wallene among have brought approach up date using composites mold upper lower surface skins lock appropriate camber skin sandwich typically 75 oz/sq yd lightweight glass cloth both sides expanded-foam coreof about 070-in thick ness So rigid sandwich skins internal ribs no longer required thinned epoxy laid 450 side thin 2 lb/cu ft core whole sandwich placed between two flexible PVC plastic sheets approx 015 thick clamped tightly between cambered molds cure together n-thick rubber pressure pad Meanwhile spar assembled separately carbon caps glued full-depth balsa web wrapped Kevlar roving outer-surface parts of upper lower molds later reused clamp molded sand wich skins together spar positioned inside final gluing What results very rigid set wings can typically weigh 52 56 oz 80-in-span model Others using new construction methods Left Selig timer-activated prop start mechanism New Zealander Rob Peters model istypical trend towards launch-delay systems Right Exquisite craftsmanship Eugeny Gorbans models streamlined timer mounts slim pylons aluminum tube fuselages July1986 57 Chinese version DPR prop hub Wenyi Zhangs modei has same features Russianswith similar climb rate Left Removing streamlined cowl reveals Russian OM N-25 PlC engine used new World Champ Nikolay Nakonechny Right Tail end Nikolays model has high stab mountto provide room positive incidence movement forthe bunting power/gildetransition included Belgian Leo Reynders solid foam cores 2 lb/cu ft hot-wire cut airfoil profile spars carbon flu-depth ply webs whole wing skinned 2 oz/sq yd glass cloth laid up similar molding tech nique 905-in-span wings flawless finish total weight 78 oz Others like Czech flier Ivan Hoijesi still use thin balsa sheet covering first laminate flat glass table outer surface lightweight glass cloth produce hard shiny finish prior attaching sheeting wing FiB Wakefield Rubber Reiner Hofsass Espada design can traced back 1965 Reiner first built high aspect ratio solid balsa wing A-i Glider inspired work fellow countrymen Schmidt Puttner Laszlo milestone Nordic design SPL 1966 tried similar wing Wakefield immediately found dra matic improvements both climb speed glide performance Later experiments water tunnel using potassium per manganate dye helped validate benefits terraced 3-D turbulators very small chord dictated planform operates very low Reynolds number about 20000 new publi cation titled Profilpolaren fur den Modell flug-Band 2 Dieter Althaus Stuttgart Aerodynamic Institute details tests Reiners airfoils together Bob White Thomas Koster Bene dek B 7406f B 6456f cost about $25 good model shops two models flown Reiner practically identical earlier plans already published 1982 NFFS Symposium Report except minor details such flat-bottom stab triangular fin airfoil fin offset give right turn unusual trailing edge angle works like op posite rudder prevents turn tightening strong lift also uses flatbottom-airfoil propeller finds less critical motors various power still produces thrust until end run prop diameter 252 Model 236 Model B used last two rounds Both have helical pitch 295 Reiner used 14 strands ofA-in-flat 1982 Pirelli morning flyoffs motor run about 38 sec chose FM Model Supply rubber during heat day Until 1985 Champs Livno Reiners Espada become widely known design flown Lothar Doing win outstanding double World Champs vic tories 1981 1983 Now have added further remarkable double plac ing 1st 2nd 1985 last word incredible performance must go Reiner modestly said .. La thars last flight showed performance Espada because flew same air other two competitors Far East model outperformed both Thermal detectors winning story 58 Model Aviation Denmarks triple champ Thomas Koster incredible all-composite-molded Excalibur has sandwich-shell ribless construction See text details Custom-built engine Onutrienko Muhin Nakonechny Note coil spring prop brake however model develop ment year Lothar further im proved system helps locate ther mals displaying rising temperature falling wind speed measured bath launch point 50 yards upwind chart recorder latest equipment trans mits information upwind radio link bonus also collected information Reiners unit would injustice both fliers suggest such system infallible skill takes interpret such information changing conditions very essence Free Flight However writing wall serious Wakefield competi tor Champs since 1979 has won system preceding two won North Korea also relied heavily thermal information relayed upwind Seriously fly Wakefield best advice invest similar unit start practicing soon possible just might have much fun Reiner Lothar Andrnkovs variable-pitch DPR mech anism genius behind Russias new young Wakefield team Aleksandr An drukov particular has taken fresh new look maximizing energy stored inthe rubber using delayed prop release DPR combined energetic javelin launch achieve highest possible climb altitude Aleks original DPR publi cized first March 1982 Aeromodeller magazine following debut World Champs Alek went become Euro pean Champion both 1982 1984 now four years later copy ing lead has refined mechanism incorporate cam-operated variable pitch model launched very hard near vertically prop blades open full diameter yet turning delayed clockwork timer blades feathered pitch minimize drag After about 08 sec delay model already some 20 ft altitude prop starts latest mechanism pitch immediately increased 30 above design During next 3 sec prop progressively reduces pitch design further 3O reduction throughout remaining power run around 38 42 sec total timer also operates other model functions auto-rudder moves right variable-incidence tail increases 10 after about 4 sec finally right wing held ng climb returns zero propeller folds glide Initially high torque fully-wound motor advances prop pitch cam half turn against resistance strong coil spring inside front spinner As rubber torque drops during flight spring returns cam actual prop pitch controlled miniature roller bearing lever follows shape cam system now permits pitch selected time during motor run simply modiIing shape cam mechanism also incorporates ratchet allows additional hand turns added fully-wound motor prevent torque dropping waiting lift Surprisingly whole nose block unit weighs just 18 oz newer version less 16 oz Alek has definitely achieved ultimate engineering solution concedes much simpler plain-bearing design would offer similar benefits Already others Livno own versions fliers China Holland Israel Switzer land West Germany New Zealand among growing number using DPR Wakefields Weayi Zhangs cam-operated variableincidence wing distinctive models Chinas Wenyi Zhang equipped ver tical tip fins dominated last flyoffs thanks aggressive tactic typically being first max round Apart being first non-Russian fly full Andrukov DPRVP mechanism Wenyis models featured unusual vari able-incidence wing Because airspeed Wakefield varies considerably throughout its flight optimum angle attack wing glide must reduced launch prevent looping problem doing incidence fuselage axis relative air flow will also effectively changed Wenyi believes can con tribute significant drag unless fuselageto-wing angle varied accordingly main tain optimum low-drag confignration fuselage times Wenyi points out can never achieved using VIT movement argnes instead fuselage-towing angle must changed uses low pylon angle 0 10 during first initial climb after launch increasing 30 40 remaining power cruise slower glide stabil izer remains fixed about uselage outstanding performances 5th Australia 4th Yugoslavia certainly lend credibility approach New rubber could hardly fundamental crisis facing Wakefield fliers today shortage motive force itselfrubber Pirelli now out production forever US suppliers Ed Dolby FAI Model Supply George Schroedter Champion Models available sources Some countries literally no rubber teams Czechs Hungarians East Ger mans Cubans entering event real hope right now appears rest Ginlio Gastaldo Italy has busy tracking down original Pirelli formulas manufacturing techniques actually involved its production batch 1 x 3mm rubber designated AG-85 produced last year Hollands Anzelmo Zen tested before Champs chose use AG-85 rubber has characteristic ribbing Pirelli surface texture may help trap lubricant good news after six months rubber continues improve age later year will also become available 1 x 6mm final note Curt Stevens Model Research Laboratories has just announced intention explore market Continued page 139 July1986 59 Nose detail Kostors model shows tightly-cowled engine exhaust ducted top wing pylon Fuselage molded pre-preg carbon fiber Right Latest development Ken Phair use Gurney flap just visible TE single-blade prop Claims greater thrust TG Mfg 857 HIgh Mountain Rd North JaIqdon NI 07508 27-3841 money race champion ship fees nearly $1000 prizes awaited best pilots weather great Five rounds later Mr Chuck Eads Roseburg OR won Championships 20 points Mr Jim Trump won second place David Denison won third place Only sec ond divided Jims Davids average times five races Standard class won David Schrum Leo Baker second Glen Miller third done yet cause Championship won using pilots two best wins circuit races added Championship race 1986 OMPRA winner still Chuck Eads second place still Jim Trump Third place went Buddy Schwesinger barely beat David Denison Standard class saw Glen Miller first David Schrum second Leo Baker third Presentations made Chuck Eads could race Washington next day headed good dinner R R cama raderie would win Super Sport race next year Yes around simple umntimidating easy-to-fly Sig Super Sport out grass comes flashing Pylon heats great Sig Super Sport What about area Putting Pylon Race easy good way local club make some extra money will write future article Send pictures results contest will see what can get column See next month Bill Hager 706 Glen Haven Dr Conroe TX 77385 RC Helicopters/Jolly Continued page 51 paint Make sure interior fuselage protected dust like either mask off openings inside fill inside newspaper Now time prime model like use K&B Superpoxy primer use whatever have good experience possible spray primer possible brush primer fact may advisable fin tailpiane first coat careful weight will build up rapidly After primer dry sand again 240 wet-or-dry like sand wet cuts faster keeps dust water pail did good job hunting down repairing imperfections two sprayed coats usually enough give good cover Im running space problems now think Ill leave project point until next month Its bad idea let freshiy primered model age little before painting anyway months photos come us way Hugh Stanley Council Bluffs IA Stans club Skyhawks year put Heli copter expo Buds Hobbies dis cussion Ive Stan gather well-rounded-out group fliers Apparently really go Scale think thats great look forward flying summer fly chib have just finished new model dontyou send few pictures Id really like use column just think best chance get face Model Aviation BCNU Addresses Scale Model Research 418 East Oceanfront Newport Beach CA 92661 Repla-Tech International Inc 48500 McKen zie Highway Vida OR 97488 Larry Jolly 5501 W Como Santa Ana CA 92703 FFWC/Cowley Continued page 59 contemplating megabucks investmentif ongoing tests appear fruitftil end year well know way other FiC Power Nikolay Nakonechnys HH-23 pre requisite consistency rigors associated actually winning World Championships often exclude ultimate model What remarkable about current Russian Power models therefore now combine ex tremes both construction flight per formance high degree reliability new generation Russian model born 1980s wings constructed sheet covering balsa skinned Continued page 146 GOLDENERAPLANES 1 0 N E i 1 BUDS STAINLESS STEEL AMPHIBIAN BIPLANE 1035 SCALE 65 Vt PULL SIZE PLANS 408 5 CHANNEL OPERATION-POWER Os PSI2O 4C WT 3 LBS PER sa FT DETAILED PLANS ZO LEWIS PANCOAST BOX EER PAR N 0401061 PH 509- 276-5855 July1986 139 w New 3.d e1 SacblDobuarLIgbf eat welahi awedpf 31 -$32500 34- $38000 37 $40000 42 $42000 Includes Ship & Hand Engines Complete Nothing Extra Buy 11581015515 Laserarnie D iA Reg $24995wdwwhM-$27995 *7SIb4gSItNP 41w Features $uAlevabed frem newest German engines net Irma rttfO-ceupIelsaftee4GqQ pert Mutfler Mount ting Salts manTup mNOk Carburetor UnlwgCOIIunhlemICH Elincuonlaal IgnItion Pa* ty wlbh 5 Dolt Hub 83Wlstor 89k PIgs arranty FmityPtoauttiWpl*s CONTIOLIII TREKS PROFILE0COMBA 70RA T WIDE & NARROW WEDGE - 6 oz Capacities UKIFLOW & STIIDD Custom DianA Fil Ingredients deEared brnchure5OC sEamps/cheCk oni CAROLINA-TAFFIN DER 8345 Delhi Road charleston Hgts. sc 29418 803-563-7169

FFWC TECHNICA EMartyn Cowley FlA Glider CHINESE CHAMPIONS models flown winning pair Yue Liang Kai Sun may have looked like tradition ally-constructed gliders beneath surface Chinese have made consider able use carbon fiber structural rein forcement main spar has pre-cured unidirectional caps typically 012 thick top 006 beneath wood used actually tung Chinese equivalent balsa being little denser used thinner sizes compensate covering bamboo paper has long fibers make stronger regular tissue applied dry doped ever being water-shrunk avoid warps airfoil used modified Rabic appears almost identical So kolov has thread turbulator 9% calm conditions Livno Chinese using timer-operated variable-inci dence tails give additional 20 inci dence during circle towwhich activated immediately upon release new World Champion Yue Liang using revolutionary type circle tow hook fitted impulse latch truly original mechanism makes accidental un latching due high wind gusts quite impossible offers first major im provement since original Russian hook Chinese hooks have incorporated mass pendulums years Now Liang has developed concept blocking opening latch roller moved inertia small pendulum triggered sudden upward accelera tion model instant zoom launch release ingenious highly effective Advances wing construction Without doubt area greatest progress F lA glider seen Livno widespread use innovative composite construction deed year trend encompassed three classes making 1985 Composite Champs Use carbon Kevlar fiberglass lightweight rigid foam plas tics allowing greater design4reedomThe benefits greater strengthid stilThess often reduction weight As werent enough quite often significant reduction building time say nothing increased accuracy repro ducibiity molds used Russian Kevlar D-box wings Trend-set ters Nordic over decade Russian glider fliers again pushing forward frontiers model design huge high aspect ratio wings utilizing Kevlar D-box construction Victor Isaenko famous sliding-plate tow hookand 1975 Champ Victor Tchop models 87-in 97-in span flew throughout event Isaenkos 97-in-span model has root chord 59 straight taper tip 39 airfoil 65% thick yet wing torsionally very stiff 63 oz extremely light such long wing Such model simply could built remain rigid enough fast zoom launches through out turbulent midday conditions resort such materials Using con struction technique already ex perimenting similar wings using airfoils less 4% thickness Wait until see zoom launch glide nextgeneration models D-box leading edge structure con sists two laminations 35 oz/sq yd Kevlar 450 resulting thickness 010 no balsa sheeting beneath Kevlar cleverly laid up wet epoxy inside V-shaped mold inLeft look Inside fuselage Ailard van Wallenes models reveals neat installation increasIngly-popular electronic timers Right prototype electronic timer wIth radio locator beacon Jim Bradley could become commercIally-avaIlable later thIs year 56 Model Aviation Shown both latched unlatched positions Vue Liangs unique Impulse-latched circle tow hook will accidently release wInd think instrumen tal first-place finish 1985 FF World Championships photos author Few can disagree modelers TiES other lands leading way high ech Free Flight innovations re corporates leading edge radius 040 After initial curing Keviar V flexible enough accommodate upper lower surface camber glued around ribs front spar con tinuous piece conjunction carbon fiber caps spars individual rib Russians have developed port last years World Champion ships gives look some things have put front maintain airfoil making construction much simpler quicker Allard makes molds 2 lb/cu ft Styrofoam 2 thick hot-wire cuts produce upper lower surface molds glass cloth wetted Left Portable chart recorder plots temperature wind speed twin sensors allow prediction thermal activity Its hard argue Its necessary belongs new Wakefield World Champion Reiner Hofasas Right engineering masterpiece Russias AieksandrAndrukov has cam-operated variable-pitch prop fully-feathered delayed prop release maximize javelin-type launch remarkably elegant structure may yet join hook standard equipment Nordic flier Ribless sandwich-skin wings years Dutch particular have favored sheeted-wing gliders similar Power mod el construction Now Aliard van Wallene among have brought approach up date using composites mold upper lower surface skins lock appropriate camber skin sandwich typically 75 oz/sq yd lightweight glass cloth both sides expanded-foam coreof about 070-in thick ness So rigid sandwich skins internal ribs no longer required thinned epoxy laid 450 side thin 2 lb/cu ft core whole sandwich placed between two flexible PVC plastic sheets approx 015 thick clamped tightly between cambered molds cure together n-thick rubber pressure pad Meanwhile spar assembled separately carbon caps glued full-depth balsa web wrapped Kevlar roving outer-surface parts of upper lower molds later reused clamp molded sand wich skins together spar positioned inside final gluing What results very rigid set wings can typically weigh 52 56 oz 80-in-span model Others using new construction methods Left Selig timer-activated prop start mechanism New Zealander Rob Peters model istypical trend towards launch-delay systems Right Exquisite craftsmanship Eugeny Gorbans models streamlined timer mounts slim pylons aluminum tube fuselages July1986 57 Chinese version DPR prop hub Wenyi Zhangs modei has same features Russianswith similar climb rate Left Removing streamlined cowl reveals Russian OM N-25 PlC engine used new World Champ Nikolay Nakonechny Right Tail end Nikolays model has high stab mountto provide room positive incidence movement forthe bunting power/gildetransition included Belgian Leo Reynders solid foam cores 2 lb/cu ft hot-wire cut airfoil profile spars carbon flu-depth ply webs whole wing skinned 2 oz/sq yd glass cloth laid up similar molding tech nique 905-in-span wings flawless finish total weight 78 oz Others like Czech flier Ivan Hoijesi still use thin balsa sheet covering first laminate flat glass table outer surface lightweight glass cloth produce hard shiny finish prior attaching sheeting wing FiB Wakefield Rubber Reiner Hofsass Espada design can traced back 1965 Reiner first built high aspect ratio solid balsa wing A-i Glider inspired work fellow countrymen Schmidt Puttner Laszlo milestone Nordic design SPL 1966 tried similar wing Wakefield immediately found dra matic improvements both climb speed glide performance Later experiments water tunnel using potassium per manganate dye helped validate benefits terraced 3-D turbulators very small chord dictated planform operates very low Reynolds number about 20000 new publi cation titled Profilpolaren fur den Modell flug-Band 2 Dieter Althaus Stuttgart Aerodynamic Institute details tests Reiners airfoils together Bob White Thomas Koster Bene dek B 7406f B 6456f cost about $25 good model shops two models flown Reiner practically identical earlier plans already published 1982 NFFS Symposium Report except minor details such flat-bottom stab triangular fin airfoil fin offset give right turn unusual trailing edge angle works like op posite rudder prevents turn tightening strong lift also uses flatbottom-airfoil propeller finds less critical motors various power still produces thrust until end run prop diameter 252 Model 236 Model B used last two rounds Both have helical pitch 295 Reiner used 14 strands ofA-in-flat 1982 Pirelli morning flyoffs motor run about 38 sec chose FM Model Supply rubber during heat day Until 1985 Champs Livno Reiners Espada become widely known design flown Lothar Doing win outstanding double World Champs vic tories 1981 1983 Now have added further remarkable double plac ing 1st 2nd 1985 last word incredible performance must go Reiner modestly said .. La thars last flight showed performance Espada because flew same air other two competitors Far East model outperformed both Thermal detectors winning story 58 Model Aviation Denmarks triple champ Thomas Koster incredible all-composite-molded Excalibur has sandwich-shell ribless construction See text details Custom-built engine Onutrienko Muhin Nakonechny Note coil spring prop brake however model develop ment year Lothar further im proved system helps locate ther mals displaying rising temperature falling wind speed measured bath launch point 50 yards upwind chart recorder latest equipment trans mits information upwind radio link bonus also collected information Reiners unit would injustice both fliers suggest such system infallible skill takes interpret such information changing conditions very essence Free Flight However writing wall serious Wakefield competi tor Champs since 1979 has won system preceding two won North Korea also relied heavily thermal information relayed upwind Seriously fly Wakefield best advice invest similar unit start practicing soon possible just might have much fun Reiner Lothar Andrnkovs variable-pitch DPR mech anism genius behind Russias new young Wakefield team Aleksandr An drukov particular has taken fresh new look maximizing energy stored inthe rubber using delayed prop release DPR combined energetic javelin launch achieve highest possible climb altitude Aleks original DPR publi cized first March 1982 Aeromodeller magazine following debut World Champs Alek went become Euro pean Champion both 1982 1984 now four years later copy ing lead has refined mechanism incorporate cam-operated variable pitch model launched very hard near vertically prop blades open full diameter yet turning delayed clockwork timer blades feathered pitch minimize drag After about 08 sec delay model already some 20 ft altitude prop starts latest mechanism pitch immediately increased 30 above design During next 3 sec prop progressively reduces pitch design further 3O reduction throughout remaining power run around 38 42 sec total timer also operates other model functions auto-rudder moves right variable-incidence tail increases 10 after about 4 sec finally right wing held ng climb returns zero propeller folds glide Initially high torque fully-wound motor advances prop pitch cam half turn against resistance strong coil spring inside front spinner As rubber torque drops during flight spring returns cam actual prop pitch controlled miniature roller bearing lever follows shape cam system now permits pitch selected time during motor run simply modiIing shape cam mechanism also incorporates ratchet allows additional hand turns added fully-wound motor prevent torque dropping waiting lift Surprisingly whole nose block unit weighs just 18 oz newer version less 16 oz Alek has definitely achieved ultimate engineering solution concedes much simpler plain-bearing design would offer similar benefits Already others Livno own versions fliers China Holland Israel Switzer land West Germany New Zealand among growing number using DPR Wakefields Weayi Zhangs cam-operated variableincidence wing distinctive models Chinas Wenyi Zhang equipped ver tical tip fins dominated last flyoffs thanks aggressive tactic typically being first max round Apart being first non-Russian fly full Andrukov DPRVP mechanism Wenyis models featured unusual vari able-incidence wing Because airspeed Wakefield varies considerably throughout its flight optimum angle attack wing glide must reduced launch prevent looping problem doing incidence fuselage axis relative air flow will also effectively changed Wenyi believes can con tribute significant drag unless fuselageto-wing angle varied accordingly main tain optimum low-drag confignration fuselage times Wenyi points out can never achieved using VIT movement argnes instead fuselage-towing angle must changed uses low pylon angle 0 10 during first initial climb after launch increasing 30 40 remaining power cruise slower glide stabil izer remains fixed about uselage outstanding performances 5th Australia 4th Yugoslavia certainly lend credibility approach New rubber could hardly fundamental crisis facing Wakefield fliers today shortage motive force itselfrubber Pirelli now out production forever US suppliers Ed Dolby FAI Model Supply George Schroedter Champion Models available sources Some countries literally no rubber teams Czechs Hungarians East Ger mans Cubans entering event real hope right now appears rest Ginlio Gastaldo Italy has busy tracking down original Pirelli formulas manufacturing techniques actually involved its production batch 1 x 3mm rubber designated AG-85 produced last year Hollands Anzelmo Zen tested before Champs chose use AG-85 rubber has characteristic ribbing Pirelli surface texture may help trap lubricant good news after six months rubber continues improve age later year will also become available 1 x 6mm final note Curt Stevens Model Research Laboratories has just announced intention explore market Continued page 139 July1986 59 Nose detail Kostors model shows tightly-cowled engine exhaust ducted top wing pylon Fuselage molded pre-preg carbon fiber Right Latest development Ken Phair use Gurney flap just visible TE single-blade prop Claims greater thrust TG Mfg 857 HIgh Mountain Rd North JaIqdon NI 07508 27-3841 money race champion ship fees nearly $1000 prizes awaited best pilots weather great Five rounds later Mr Chuck Eads Roseburg OR won Championships 20 points Mr Jim Trump won second place David Denison won third place Only sec ond divided Jims Davids average times five races Standard class won David Schrum Leo Baker second Glen Miller third done yet cause Championship won using pilots two best wins circuit races added Championship race 1986 OMPRA winner still Chuck Eads second place still Jim Trump Third place went Buddy Schwesinger barely beat David Denison Standard class saw Glen Miller first David Schrum second Leo Baker third Presentations made Chuck Eads could race Washington next day headed good dinner R R cama raderie would win Super Sport race next year Yes around simple umntimidating easy-to-fly Sig Super Sport out grass comes flashing Pylon heats great Sig Super Sport What about area Putting Pylon Race easy good way local club make some extra money will write future article Send pictures results contest will see what can get column See next month Bill Hager 706 Glen Haven Dr Conroe TX 77385 RC Helicopters/Jolly Continued page 51 paint Make sure interior fuselage protected dust like either mask off openings inside fill inside newspaper Now time prime model like use K&B Superpoxy primer use whatever have good experience possible spray primer possible brush primer fact may advisable fin tailpiane first coat careful weight will build up rapidly After primer dry sand again 240 wet-or-dry like sand wet cuts faster keeps dust water pail did good job hunting down repairing imperfections two sprayed coats usually enough give good cover Im running space problems now think Ill leave project point until next month Its bad idea let freshiy primered model age little before painting anyway months photos come us way Hugh Stanley Council Bluffs IA Stans club Skyhawks year put Heli copter expo Buds Hobbies dis cussion Ive Stan gather well-rounded-out group fliers Apparently really go Scale think thats great look forward flying summer fly chib have just finished new model dontyou send few pictures Id really like use column just think best chance get face Model Aviation BCNU Addresses Scale Model Research 418 East Oceanfront Newport Beach CA 92661 Repla-Tech International Inc 48500 McKen zie Highway Vida OR 97488 Larry Jolly 5501 W Como Santa Ana CA 92703 FFWC/Cowley Continued page 59 contemplating megabucks investmentif ongoing tests appear fruitftil end year well know way other FiC Power Nikolay Nakonechnys HH-23 pre requisite consistency rigors associated actually winning World Championships often exclude ultimate model What remarkable about current Russian Power models therefore now combine ex tremes both construction flight per formance high degree reliability new generation Russian model born 1980s wings constructed sheet covering balsa skinned Continued page 146 GOLDENERAPLANES 1 0 N E i 1 BUDS STAINLESS STEEL AMPHIBIAN BIPLANE 1035 SCALE 65 Vt PULL SIZE PLANS 408 5 CHANNEL OPERATION-POWER Os PSI2O 4C WT 3 LBS PER sa FT DETAILED PLANS ZO LEWIS PANCOAST BOX EER PAR N 0401061 PH 509- 276-5855 July1986 139 w New 3.d e1 SacblDobuarLIgbf eat welahi awedpf 31 -$32500 34- $38000 37 $40000 42 $42000 Includes Ship & Hand Engines Complete Nothing Extra Buy 11581015515 Laserarnie D iA Reg $24995wdwwhM-$27995 *7SIb4gSItNP 41w Features $uAlevabed frem newest German engines net Irma rttfO-ceupIelsaftee4GqQ pert Mutfler Mount ting Salts manTup mNOk Carburetor UnlwgCOIIunhlemICH Elincuonlaal IgnItion Pa* ty wlbh 5 Dolt Hub 83Wlstor 89k PIgs arranty FmityPtoauttiWpl*s CONTIOLIII TREKS PROFILE0COMBA 70RA T WIDE & NARROW WEDGE - 6 oz Capacities UKIFLOW & STIIDD Custom DianA Fil Ingredients deEared brnchure5OC sEamps/cheCk oni CAROLINA-TAFFIN DER 8345 Delhi Road charleston Hgts. sc 29418 803-563-7169