56 Model Aviation EMBRYO ENDURANCE fun laidback event appeals ages beginner expert alike Much like Bostonian other popular fun event Embryo has re cently gained renewed following due large part its promotion both NFFS Flying Aces Club event originated West Coast back mid-Sixties rules listed below some slight changes rules still use today 1 The event rubber-powered models 50 sq wing area monoplanes 70 sq biplanes Stabilizer area exceed 50% wing area 2 Fuselage volume enclose space 125 x 150 x 3 larger 3 The wing tail built up covered both sides Japanese tissue equivalent 4 The model must ROG off card table top unassisted three-point rest 5 Landing gear legs must conven tional configuration have 34-in -dia wheels larger Example Two wheels landing gear prohibited etc 6 No folding feathering props de Top picture Embry-omatic ready fly model took first place Embryo Sr achieving two maxes third flight 98 sec 1989 NFFS US Outdoor Campion ships bad brand-new still roughly trimmed airplane its first contest present tis model tweaked point maxes almost flight Above Top view Embry-omatic showing exhaust pipes wheel pants open cockpit windscreen headrest earn bonus points under FAC Flying Aces Club Embryo rules Left The author right winds brother Matt hoids model 25 1/8-in tan rubber Embry-omatic its best author strongly advises installing dethermalizer model because its high performance capability Right Shes off push Note card table ROG required Embryo rules model quite powerful zooms up quickly Brother Matt critiquing launch thermalizers allowed 7 Unlimited attempts make three official rise-off-table flights allowed twominute max 8 highest flight total plus bonus points wins Flyoffs staged break ties addition rules Flying Aces Club has devised bonus system Em bryo Five seconds added raised cabin windscreen open cockpit headrest three seconds threedimensional wheel pants second three-dimensional exhaust pipes bonus seconds maximum nine added three-flight total final score Embry-omatic blends both ends spectrum model looks great also superb flier properly built trimmed itll amaze its big mod el flight characteristics airplane climbs off table easily shoots up ver tically like rocket several seconds After motor run well over minute Embry-omatic reaches altitude several hundred feet nearly max before starts its glide little treatise models per formance hasnt steered toward workshop dont know what will youre beginner dont let description airplanes performance daunt As quick glance plan will show Embry-omatic very simple straight forward construction just easy fly Almost anyone can build model achieve excellent results Go Construction Before begin building sure have proper materials wood espe cially must top quality Champion Model Products Old Timer Model Sup ply addresses end article sell firstrate wood type model Embry-omatic uses medium lightweight 46-sq balsa fuselage structure dium hard balsa wing stabi lizer leading trailing edges light A, /32 sheet balsa everywhere else Dont make model light sacrifice strength needs robust withstand rigors wind other outdoor fly ing hazards Now lets get building Fuselage Build two identical sides using favorite method resin glue such Titebond recommended its lasting strength fuselage sides drying make wing stabilizer rib templates 44 ply Cut out ribs lightweight balsa time fuselage sides will dry Because its curved profile fuse lage must completed off board Cut top bottom crosspieces using top view plan guide Install parts one doing best keep fuselage aligned Medium Hot Stuff another CyA cyanoacrylate glue should used during operation because its quick adhesion Take time itll come out right Once fuselage structure completed bend landing gear 42 music wire install balsa crosspiece per plan Again use CyA glue oper ation Make tight-fitting nose block hard balsa Thoroughly sand entire fuselage remove imperfections set aside covering later Wing leading trailing edges must fairly hard very straight high-quality wood should used Cover plans waxed paper plastic wrap pin down leading trailing edges over plan Position glue rib making sure its straight snug glue drying stabilizer may built same manner except spar may added struc ture still pinned plan Once ribs dry wing ready August 1990 57 author hand launching Embry-omatic during sequence low-power test flights adjust trim Its important have bright contrasting color scheme airplane gets very small reaches its max altitude good prop heart Embryo model Pictured Peck 7-in prop mounted its nose block its excellent choice Embryos very simple beginners Note reverse S-hooks essential preventing rubber climbing hook Full-Size Plans Available. Page 196 SOFT BALSA TIPS iF II III rLE 3/32 SQ rn 1/16 SQ SPARS DIHEDRAL 1/2 UNDER EACH TIP PANEL STAB RIB-6 FROM 1/32 3 FROM I/is 1/16 GUSSETS STIFF 1/16 SQK 2-1/16 50--- ___ 1/16 DOWELS FOR HARD BALSARUBBER BANDS NOSEBLOCK REVERSE S HOOK OPTIONAL PECK 7 PROP 1/20 1/16 50 LE AND TE -7 5/32 BALSA SHIM SOFT 1/16 SQ1 CROSSPIECES -J I/16x 1/32 1/16 SIDES MOTOR 25 LP I/B 2 LAMS 1/32 3/4 DIA BRAIDED t 1/16 x 3/16 WING RIBS MAKE II 1/32 SHI MAKE 2 OF EACH ALL 1/32 SHT 2 CROSS-GRAIN SQ STOP 1/16 1/32 SHT- SOFT/ 1/32 DIA BALSALG WIRE~ORTHO I/I6SHT BANDS 1/16 SHT040 50 BASS LCUT WINDSHIELD FROM BATTERY PACKAGE3/16 PECK FUSE ALL DIMENSIONS IN INCHES PROTOTYPE WT 15 GRAMS SCALE IN HE 0 234 56 MODEL AVIATION EMBRY-OMAT IC EMBRYO ENDURANCE MODEL DESIGNED DRAWN AND INKED BY-42d"L 27 JANUARY 1990 finishing setting dihedral First cut off wing tip proper lo cation remove plan Give panels light sanding create nice bevel leading trailing edge joints Block up tip proper angle per plan carefully glue Tite bond Allow hour drying remove work surface Install two spars gussets Sand lightly re move imperfections set aside fins last items built before model can covered Use very light A6 balsa Titebond glue may also want build small subrudder point omitted prototype plan add near future will sist model making smoother take off probably improve appearance Covering As rubber-powered models Japanese tissue material choice whove never used material its light strong easy work fine quality covering money Peck Micro-X Champion Old Timer carry several colors about 75 cents sheet Nitrate dope best adhering tis sue airframe Cover simple pieces first starting fuselage fins moving stabilizer wings gain experience airfoiled sides wing stab toughest cover flawlessly Take time surfaces work carefully Remember Continued page 186 58 Model Aviation Left stabilizer its dethermalized position tall pops up 600 angle using carpet thread reatrictor stab rear mount 1Aa ply Note all-important found label attached under stab Right tail Its flight position Its held down small dental bands prototype required small up-elevator trim shim just visible under trailing edge sure tail straight level before flying measuring sound its totalityis better realistic method measuring noise As saw above means increase rpm must reduce dB Conversely lower rpm dB can higher much higher lower find Out went back chart calcu lated effect both raising lowering rpm 6000 keeping distance ac ceptability constant case resulting change 6 dB means 1000 rpm 1 dB roughly equal ability irritate Therefore have determined field limit 90 dB 12000 rpm pilot wants fly 18000 rpm must drop 6 dB 84 dB other hand hes turning 6000 rpm gets 6 dB bonus can fly 96 dB still have same level noise simplii calculations can add dB rpm thousands together use answer field limit instance 90 dB 12000 rpm would equal 102 Any dB rpm combination adding up number less would acceptable Using criterion a~m plishes two things gives club much better noise control allows fliers use field having conform unreasonable dB level especially important anyone has low-frequency plane large two- fourstroke engine Four-stroke engines have ad vantage audio frequency onehalf rpm Thus using method four-strokes must remember calculate one-half measured rpm frequently case dB higher engines sound quieter twostrokes Gopher Canyon site set noise limit NF 96 dB plus rpm/bOO twostroke rpm/2000 four-stroke engines determined proximity neighbor about 1000 ft overfly area rural setting meet standard club set out vent new mufflers response mem bers terrific numbers designs varied inventors lot fun Den nis Caudle wrote program com puter assist designing tuned mufflers Ive found meeting noise levels use simple additional internal chambers soundabsorbing coatings Lowering rpm too essen tial surprise seem having success two-stroke engines fourstrokers As writing city council has voted unanimously give us full use field Th testing continues however Gopher Canyos has become headquarters studying sounc San Diego County latest experiments spectral analyzer have yielded some inter esting results Most clubs fly sites situated 4000 ft residential areas limit 90 dB 9 ft recommended AMA reasonable standard However urbanizatior continues residential growth closes ir around more flying fields welJ need accurate knowledge about levels 01 noise creating Measuring total sound output rather merely dB levels positive step controlling noise before causes loss flying site References Ernest J McCormick Hwnan Factors Engi neering 3rd ed New York McGraw-Hill Book Co 1970 pp 525-528 2 ISO Technical Committee 43 Acoustics Rat ing Noise Respect Hearing Conversation Speech Communication Annoyance Secretariat-189 August 1961 GF Abbott Flying Field Layout Meet Noise Criteria Model Aviation Nov 1987 pp 24-35 Editor grateful George F Abbott checking manuscript Gopher Canyon article offering several suggestions incorporated Embry-omatic/De Loach Continued page 58 grain tissue must run lengthwise structure being covered parts covered its time shrink tissue tight moistening Again start fuselage Thoroughly moisten covering water alcohol Dont worry about getting too wet structure wont warp Set fuse lage aside dry wing empennage another matter Shrinking tissue structures must done very carefully since will warp quite easily have airbrush mist surfaces lightly tiny amount water alcohol Without airbrush task little dif ficult case best lightly sprink ling fingertips warps occur can steamed Out over teakettle before Continued page 190 186 Model Aviation Fly Mc Daniel Power New Solid State On-Board Glow-Plug Drivers Now can drive 1 2 glow plugs efficiently automatically new McDaniel On-Board Glow-Plug Drivers engine 2 4 stroke glow has 1 2 cylinders Model 471 472 On-Board Glow-Plug Driver will ease jobs starting maintaining idle during taxiing power down flight maneuvers FEATURES INCLUDE Servo Reversing Optically Coupled Circuitry No RFI Automatic Shutdown Via TX RX Connector Plug Battery Pack Remote Glow Plug Indicator Panels Available Separately Battery Pack AC Charger NOT Included Available Separately See Year Local Hobby Dealer Contact McDaniel R/C IncVisa MC accepted 1654 Crofton Blvd Suite 4 Crofton MD 21114 e 301721-6303 301721-6306 II V flULUUI Made ot White Laminating Epoxy & Fiberglass Strong Lightweight No Pin Holes tle e Construction dor Available black red white sizes 1$325 2375 21/4425 2V2475 Spinners new Master Airscrew spinner series features aluminum backplate true running cones made engineering grade nylon strength resist starter burn spinners easily mounted two screws custom fit Master Airscrew propellers black red white See Hobby Dealer MASTER AIRSCREW propellers accessories WINDSOR PROPELLER CO 3219 Monier Circle Rancho Cordova CA 95742 Embry-omatic/De Loach Continued page 186 dope applied Once tissue properly shrunk warps removed surfaces can doped 50/50 mixture dope thinner well plasticized castor oil TCP tri-creosol phosphate four drops per ounce dope/thinner Assembly Glue %2 balsa shim under wing leading edge correct incidence shown plan Youll notice wing rubberbanded #10 rubberbands place rather glued may glue prefer popoff wing surely does help inevitable rough landings DT dethermalizer also optional al though strongly recommend installing Dont let models small size its Embryo status fool underestimating its perform ance potentialand consequent need dether malizer Like gutsy flier model will fol low wherever good thermal leadsin other words 005 out-of-sight Another reason dethermalizer enables adjust decalage small shims under trailing edge stabilizer rest case Before rigging stabilizer fuselage rudders subrudder youre building must glued place Embellishing model wheel pants make sure wheels rotate freely inside cock pit details windscreen headrest exhaust pipes made aluminum tubing CyAd place greatly improves appearance ex haust pipes shown plans exact placement unimportant As described ear lier detailing model will also earn bonus points Bend shaft seven-inch Peck gray plastic prop using reverse S-hook made /32 music wire Flying Its best start motor youll probably end up Use 25-in loop %-in rubber noted plan model built light should have motor should give excellent results Install motor balance model CG center-of-gravity location marked plan Add clay nose until balance achieved Test glide model over soft grass during calm early morning evening Adjust sta bilizer shims until airplane settles nsce floating glide Induce gentle right left glide turn adjusting rudder accordingly well wind about hundred turns first powered flight Gradually work way up more turns mak ing adjustments necessary Youll probably have put little downthrust did power builds up Also youll need shim little right left thrust model will circle un der power Try both right left thrust will work better other model haves differently Once again try everything see what works best model excitement really begins once model balanced trimmed flying correctly Now its time see just Embry-omatically airplane performsand believe perform word new FAI Model Supply tan rubber Im able crank 2500 turns yielding motor run easily minute half kind power dont forget light DT fuse Any questions about Embry-omatic may addressed author 3428 Bryn Mawr Dal las TX 75225 Suppliers Peck-Polymers PO Box 2498 La Mesa CA 92041 tissue props glue Old Timer Model Supply PO Box 7334 Van Nuys CA 91409 tissue wood wire props Champion Model Products 880 Carmen Court La Verne CA 91750 wood tissue DT fuse thodonix bands rubber lube FAI Model Supply PO Box 3957 Torrance CA 90510 rubber Bob Wilder 2010 Boston Irving TX 75061 201 winder Join NFFS today Penaud/Hannan Continued page 68 gan own first constructions Alleghany 1887 Langley did learn Pnaud 1872 1 Aeronaure article adopted Pnaud concepts some own aerodrome models Langleys planophore-type designs identi fled Aerodrome No 11 illustrated both drawing photograph Memoir Curiously Langley seems have employec twisted rubber power earliest models Perhaps may have learned some Francois Dandrieux butterflies widely marketed early 1879 would poetic justice indeed since butter flies commercial adaptations P6nauds Helicopters Two examples Dandricux models Smithsonian collection years Might Langley have brought Although constructed nearly 40 rubberpowered models before 1893 experimented wide variety configurations Langley achieved limited success can share frustration recalled wings general flat some cases curved rubber usually wound about 100 turns trou ble continually arose its kinldng une qual unwinding often caused erratic flights Langley also encountered frequent breakages After reading Pnauds 13-second duration planophore flight candidly wrote have never obtained good result rubber motor added longest flights obtainable did exceed six eight sec onds time nor 80 100 feet distance brief owing spas modic action rubber other causes ir regular extremely difficult obtain imperfect results actually de duced what would certainly appear have retrogressive move Langley turned during 1895 models powered rubber tension surprisingly gave poor results com plex weighty mechanisms models still exist Smithsonian collection Langley also considered rejected power plants employing gunpowder hot water com pressed air electricity carbon dioxide before achieving some success steam fi nally gasoline 1896 steam-powered Aero drome identified No 5 suggests revised numbering system unrelated rubber-driven model series Langley planophore type During 1920s Paul Garber now historian emeritus Ramsey Fellow National Air Space Museum touring Langleys long-dormant shop building Smithsonian Institution Among paraphernalia old model planophore configuration Garber asked es BLIILD*CD*MODELS* am sOll making wsId famous histonic inc modet plans aailable Foim 1/32 5/C C/L F/F ubben stetjo Ill tlnem anymt,e145t plans Real choiCe items Ask old time model 0500 ohotolanhle youaelt long, send Si * fo te CleoolandSesignd piotoojal catalog booklet bannially illustated pioe list St Foeign odd St Al MaiL Non I, Sam day seeioe hOot no dealoo enteR museums [Edund 7 Panku,d4ticlicn Bnl -innd CLEVELAND MODEL & SUPPLY 7B Dotnoit Cloteland OH 44102V-* TOURNAMENT CHAMPIONS Finals Las Vegas NVNov 9-11 Special Discounted Airfare Call Irene Gerny CONTEMPORARY TRAVEL 800-3360033 Outside NYS 516-360-3663 NYS 190 Model Aviation Leader Small Airfoil Technology
Edition: Model Aviation - 1990/08
Page Numbers: 56, 57, 58, 186, 190
56 Model Aviation EMBRYO ENDURANCE fun laidback event appeals ages beginner expert alike Much like Bostonian other popular fun event Embryo has re cently gained renewed following due large part its promotion both NFFS Flying Aces Club event originated West Coast back mid-Sixties rules listed below some slight changes rules still use today 1 The event rubber-powered models 50 sq wing area monoplanes 70 sq biplanes Stabilizer area exceed 50% wing area 2 Fuselage volume enclose space 125 x 150 x 3 larger 3 The wing tail built up covered both sides Japanese tissue equivalent 4 The model must ROG off card table top unassisted three-point rest 5 Landing gear legs must conven tional configuration have 34-in -dia wheels larger Example Two wheels landing gear prohibited etc 6 No folding feathering props de Top picture Embry-omatic ready fly model took first place Embryo Sr achieving two maxes third flight 98 sec 1989 NFFS US Outdoor Campion ships bad brand-new still roughly trimmed airplane its first contest present tis model tweaked point maxes almost flight Above Top view Embry-omatic showing exhaust pipes wheel pants open cockpit windscreen headrest earn bonus points under FAC Flying Aces Club Embryo rules Left The author right winds brother Matt hoids model 25 1/8-in tan rubber Embry-omatic its best author strongly advises installing dethermalizer model because its high performance capability Right Shes off push Note card table ROG required Embryo rules model quite powerful zooms up quickly Brother Matt critiquing launch thermalizers allowed 7 Unlimited attempts make three official rise-off-table flights allowed twominute max 8 highest flight total plus bonus points wins Flyoffs staged break ties addition rules Flying Aces Club has devised bonus system Em bryo Five seconds added raised cabin windscreen open cockpit headrest three seconds threedimensional wheel pants second three-dimensional exhaust pipes bonus seconds maximum nine added three-flight total final score Embry-omatic blends both ends spectrum model looks great also superb flier properly built trimmed itll amaze its big mod el flight characteristics airplane climbs off table easily shoots up ver tically like rocket several seconds After motor run well over minute Embry-omatic reaches altitude several hundred feet nearly max before starts its glide little treatise models per formance hasnt steered toward workshop dont know what will youre beginner dont let description airplanes performance daunt As quick glance plan will show Embry-omatic very simple straight forward construction just easy fly Almost anyone can build model achieve excellent results Go Construction Before begin building sure have proper materials wood espe cially must top quality Champion Model Products Old Timer Model Sup ply addresses end article sell firstrate wood type model Embry-omatic uses medium lightweight 46-sq balsa fuselage structure dium hard balsa wing stabi lizer leading trailing edges light A, /32 sheet balsa everywhere else Dont make model light sacrifice strength needs robust withstand rigors wind other outdoor fly ing hazards Now lets get building Fuselage Build two identical sides using favorite method resin glue such Titebond recommended its lasting strength fuselage sides drying make wing stabilizer rib templates 44 ply Cut out ribs lightweight balsa time fuselage sides will dry Because its curved profile fuse lage must completed off board Cut top bottom crosspieces using top view plan guide Install parts one doing best keep fuselage aligned Medium Hot Stuff another CyA cyanoacrylate glue should used during operation because its quick adhesion Take time itll come out right Once fuselage structure completed bend landing gear 42 music wire install balsa crosspiece per plan Again use CyA glue oper ation Make tight-fitting nose block hard balsa Thoroughly sand entire fuselage remove imperfections set aside covering later Wing leading trailing edges must fairly hard very straight high-quality wood should used Cover plans waxed paper plastic wrap pin down leading trailing edges over plan Position glue rib making sure its straight snug glue drying stabilizer may built same manner except spar may added struc ture still pinned plan Once ribs dry wing ready August 1990 57 author hand launching Embry-omatic during sequence low-power test flights adjust trim Its important have bright contrasting color scheme airplane gets very small reaches its max altitude good prop heart Embryo model Pictured Peck 7-in prop mounted its nose block its excellent choice Embryos very simple beginners Note reverse S-hooks essential preventing rubber climbing hook Full-Size Plans Available. Page 196 SOFT BALSA TIPS iF II III rLE 3/32 SQ rn 1/16 SQ SPARS DIHEDRAL 1/2 UNDER EACH TIP PANEL STAB RIB-6 FROM 1/32 3 FROM I/is 1/16 GUSSETS STIFF 1/16 SQK 2-1/16 50--- ___ 1/16 DOWELS FOR HARD BALSARUBBER BANDS NOSEBLOCK REVERSE S HOOK OPTIONAL PECK 7 PROP 1/20 1/16 50 LE AND TE -7 5/32 BALSA SHIM SOFT 1/16 SQ1 CROSSPIECES -J I/16x 1/32 1/16 SIDES MOTOR 25 LP I/B 2 LAMS 1/32 3/4 DIA BRAIDED t 1/16 x 3/16 WING RIBS MAKE II 1/32 SHI MAKE 2 OF EACH ALL 1/32 SHT 2 CROSS-GRAIN SQ STOP 1/16 1/32 SHT- SOFT/ 1/32 DIA BALSALG WIRE~ORTHO I/I6SHT BANDS 1/16 SHT040 50 BASS LCUT WINDSHIELD FROM BATTERY PACKAGE3/16 PECK FUSE ALL DIMENSIONS IN INCHES PROTOTYPE WT 15 GRAMS SCALE IN HE 0 234 56 MODEL AVIATION EMBRY-OMAT IC EMBRYO ENDURANCE MODEL DESIGNED DRAWN AND INKED BY-42d"L 27 JANUARY 1990 finishing setting dihedral First cut off wing tip proper lo cation remove plan Give panels light sanding create nice bevel leading trailing edge joints Block up tip proper angle per plan carefully glue Tite bond Allow hour drying remove work surface Install two spars gussets Sand lightly re move imperfections set aside fins last items built before model can covered Use very light A6 balsa Titebond glue may also want build small subrudder point omitted prototype plan add near future will sist model making smoother take off probably improve appearance Covering As rubber-powered models Japanese tissue material choice whove never used material its light strong easy work fine quality covering money Peck Micro-X Champion Old Timer carry several colors about 75 cents sheet Nitrate dope best adhering tis sue airframe Cover simple pieces first starting fuselage fins moving stabilizer wings gain experience airfoiled sides wing stab toughest cover flawlessly Take time surfaces work carefully Remember Continued page 186 58 Model Aviation Left stabilizer its dethermalized position tall pops up 600 angle using carpet thread reatrictor stab rear mount 1Aa ply Note all-important found label attached under stab Right tail Its flight position Its held down small dental bands prototype required small up-elevator trim shim just visible under trailing edge sure tail straight level before flying measuring sound its totalityis better realistic method measuring noise As saw above means increase rpm must reduce dB Conversely lower rpm dB can higher much higher lower find Out went back chart calcu lated effect both raising lowering rpm 6000 keeping distance ac ceptability constant case resulting change 6 dB means 1000 rpm 1 dB roughly equal ability irritate Therefore have determined field limit 90 dB 12000 rpm pilot wants fly 18000 rpm must drop 6 dB 84 dB other hand hes turning 6000 rpm gets 6 dB bonus can fly 96 dB still have same level noise simplii calculations can add dB rpm thousands together use answer field limit instance 90 dB 12000 rpm would equal 102 Any dB rpm combination adding up number less would acceptable Using criterion a~m plishes two things gives club much better noise control allows fliers use field having conform unreasonable dB level especially important anyone has low-frequency plane large two- fourstroke engine Four-stroke engines have ad vantage audio frequency onehalf rpm Thus using method four-strokes must remember calculate one-half measured rpm frequently case dB higher engines sound quieter twostrokes Gopher Canyon site set noise limit NF 96 dB plus rpm/bOO twostroke rpm/2000 four-stroke engines determined proximity neighbor about 1000 ft overfly area rural setting meet standard club set out vent new mufflers response mem bers terrific numbers designs varied inventors lot fun Den nis Caudle wrote program com puter assist designing tuned mufflers Ive found meeting noise levels use simple additional internal chambers soundabsorbing coatings Lowering rpm too essen tial surprise seem having success two-stroke engines fourstrokers As writing city council has voted unanimously give us full use field Th testing continues however Gopher Canyos has become headquarters studying sounc San Diego County latest experiments spectral analyzer have yielded some inter esting results Most clubs fly sites situated 4000 ft residential areas limit 90 dB 9 ft recommended AMA reasonable standard However urbanizatior continues residential growth closes ir around more flying fields welJ need accurate knowledge about levels 01 noise creating Measuring total sound output rather merely dB levels positive step controlling noise before causes loss flying site References Ernest J McCormick Hwnan Factors Engi neering 3rd ed New York McGraw-Hill Book Co 1970 pp 525-528 2 ISO Technical Committee 43 Acoustics Rat ing Noise Respect Hearing Conversation Speech Communication Annoyance Secretariat-189 August 1961 GF Abbott Flying Field Layout Meet Noise Criteria Model Aviation Nov 1987 pp 24-35 Editor grateful George F Abbott checking manuscript Gopher Canyon article offering several suggestions incorporated Embry-omatic/De Loach Continued page 58 grain tissue must run lengthwise structure being covered parts covered its time shrink tissue tight moistening Again start fuselage Thoroughly moisten covering water alcohol Dont worry about getting too wet structure wont warp Set fuse lage aside dry wing empennage another matter Shrinking tissue structures must done very carefully since will warp quite easily have airbrush mist surfaces lightly tiny amount water alcohol Without airbrush task little dif ficult case best lightly sprink ling fingertips warps occur can steamed Out over teakettle before Continued page 190 186 Model Aviation Fly Mc Daniel Power New Solid State On-Board Glow-Plug Drivers Now can drive 1 2 glow plugs efficiently automatically new McDaniel On-Board Glow-Plug Drivers engine 2 4 stroke glow has 1 2 cylinders Model 471 472 On-Board Glow-Plug Driver will ease jobs starting maintaining idle during taxiing power down flight maneuvers FEATURES INCLUDE Servo Reversing Optically Coupled Circuitry No RFI Automatic Shutdown Via TX RX Connector Plug Battery Pack Remote Glow Plug Indicator Panels Available Separately Battery Pack AC Charger NOT Included Available Separately See Year Local Hobby Dealer Contact McDaniel R/C IncVisa MC accepted 1654 Crofton Blvd Suite 4 Crofton MD 21114 e 301721-6303 301721-6306 II V flULUUI Made ot White Laminating Epoxy & Fiberglass Strong Lightweight No Pin Holes tle e Construction dor Available black red white sizes 1$325 2375 21/4425 2V2475 Spinners new Master Airscrew spinner series features aluminum backplate true running cones made engineering grade nylon strength resist starter burn spinners easily mounted two screws custom fit Master Airscrew propellers black red white See Hobby Dealer MASTER AIRSCREW propellers accessories WINDSOR PROPELLER CO 3219 Monier Circle Rancho Cordova CA 95742 Embry-omatic/De Loach Continued page 186 dope applied Once tissue properly shrunk warps removed surfaces can doped 50/50 mixture dope thinner well plasticized castor oil TCP tri-creosol phosphate four drops per ounce dope/thinner Assembly Glue %2 balsa shim under wing leading edge correct incidence shown plan Youll notice wing rubberbanded #10 rubberbands place rather glued may glue prefer popoff wing surely does help inevitable rough landings DT dethermalizer also optional al though strongly recommend installing Dont let models small size its Embryo status fool underestimating its perform ance potentialand consequent need dether malizer Like gutsy flier model will fol low wherever good thermal leadsin other words 005 out-of-sight Another reason dethermalizer enables adjust decalage small shims under trailing edge stabilizer rest case Before rigging stabilizer fuselage rudders subrudder youre building must glued place Embellishing model wheel pants make sure wheels rotate freely inside cock pit details windscreen headrest exhaust pipes made aluminum tubing CyAd place greatly improves appearance ex haust pipes shown plans exact placement unimportant As described ear lier detailing model will also earn bonus points Bend shaft seven-inch Peck gray plastic prop using reverse S-hook made /32 music wire Flying Its best start motor youll probably end up Use 25-in loop %-in rubber noted plan model built light should have motor should give excellent results Install motor balance model CG center-of-gravity location marked plan Add clay nose until balance achieved Test glide model over soft grass during calm early morning evening Adjust sta bilizer shims until airplane settles nsce floating glide Induce gentle right left glide turn adjusting rudder accordingly well wind about hundred turns first powered flight Gradually work way up more turns mak ing adjustments necessary Youll probably have put little downthrust did power builds up Also youll need shim little right left thrust model will circle un der power Try both right left thrust will work better other model haves differently Once again try everything see what works best model excitement really begins once model balanced trimmed flying correctly Now its time see just Embry-omatically airplane performsand believe perform word new FAI Model Supply tan rubber Im able crank 2500 turns yielding motor run easily minute half kind power dont forget light DT fuse Any questions about Embry-omatic may addressed author 3428 Bryn Mawr Dal las TX 75225 Suppliers Peck-Polymers PO Box 2498 La Mesa CA 92041 tissue props glue Old Timer Model Supply PO Box 7334 Van Nuys CA 91409 tissue wood wire props Champion Model Products 880 Carmen Court La Verne CA 91750 wood tissue DT fuse thodonix bands rubber lube FAI Model Supply PO Box 3957 Torrance CA 90510 rubber Bob Wilder 2010 Boston Irving TX 75061 201 winder Join NFFS today Penaud/Hannan Continued page 68 gan own first constructions Alleghany 1887 Langley did learn Pnaud 1872 1 Aeronaure article adopted Pnaud concepts some own aerodrome models Langleys planophore-type designs identi fled Aerodrome No 11 illustrated both drawing photograph Memoir Curiously Langley seems have employec twisted rubber power earliest models Perhaps may have learned some Francois Dandrieux butterflies widely marketed early 1879 would poetic justice indeed since butter flies commercial adaptations P6nauds Helicopters Two examples Dandricux models Smithsonian collection years Might Langley have brought Although constructed nearly 40 rubberpowered models before 1893 experimented wide variety configurations Langley achieved limited success can share frustration recalled wings general flat some cases curved rubber usually wound about 100 turns trou ble continually arose its kinldng une qual unwinding often caused erratic flights Langley also encountered frequent breakages After reading Pnauds 13-second duration planophore flight candidly wrote have never obtained good result rubber motor added longest flights obtainable did exceed six eight sec onds time nor 80 100 feet distance brief owing spas modic action rubber other causes ir regular extremely difficult obtain imperfect results actually de duced what would certainly appear have retrogressive move Langley turned during 1895 models powered rubber tension surprisingly gave poor results com plex weighty mechanisms models still exist Smithsonian collection Langley also considered rejected power plants employing gunpowder hot water com pressed air electricity carbon dioxide before achieving some success steam fi nally gasoline 1896 steam-powered Aero drome identified No 5 suggests revised numbering system unrelated rubber-driven model series Langley planophore type During 1920s Paul Garber now historian emeritus Ramsey Fellow National Air Space Museum touring Langleys long-dormant shop building Smithsonian Institution Among paraphernalia old model planophore configuration Garber asked es BLIILD*CD*MODELS* am sOll making wsId famous histonic inc modet plans aailable Foim 1/32 5/C C/L F/F ubben stetjo Ill tlnem anymt,e145t plans Real choiCe items Ask old time model 0500 ohotolanhle youaelt long, send Si * fo te CleoolandSesignd piotoojal catalog booklet bannially illustated pioe list St Foeign odd St Al MaiL Non I, Sam day seeioe hOot no dealoo enteR museums [Edund 7 Panku,d4ticlicn Bnl -innd CLEVELAND MODEL & SUPPLY 7B Dotnoit Cloteland OH 44102V-* TOURNAMENT CHAMPIONS Finals Las Vegas NVNov 9-11 Special Discounted Airfare Call Irene Gerny CONTEMPORARY TRAVEL 800-3360033 Outside NYS 516-360-3663 NYS 190 Model Aviation Leader Small Airfoil Technology
Edition: Model Aviation - 1990/08
Page Numbers: 56, 57, 58, 186, 190
56 Model Aviation EMBRYO ENDURANCE fun laidback event appeals ages beginner expert alike Much like Bostonian other popular fun event Embryo has re cently gained renewed following due large part its promotion both NFFS Flying Aces Club event originated West Coast back mid-Sixties rules listed below some slight changes rules still use today 1 The event rubber-powered models 50 sq wing area monoplanes 70 sq biplanes Stabilizer area exceed 50% wing area 2 Fuselage volume enclose space 125 x 150 x 3 larger 3 The wing tail built up covered both sides Japanese tissue equivalent 4 The model must ROG off card table top unassisted three-point rest 5 Landing gear legs must conven tional configuration have 34-in -dia wheels larger Example Two wheels landing gear prohibited etc 6 No folding feathering props de Top picture Embry-omatic ready fly model took first place Embryo Sr achieving two maxes third flight 98 sec 1989 NFFS US Outdoor Campion ships bad brand-new still roughly trimmed airplane its first contest present tis model tweaked point maxes almost flight Above Top view Embry-omatic showing exhaust pipes wheel pants open cockpit windscreen headrest earn bonus points under FAC Flying Aces Club Embryo rules Left The author right winds brother Matt hoids model 25 1/8-in tan rubber Embry-omatic its best author strongly advises installing dethermalizer model because its high performance capability Right Shes off push Note card table ROG required Embryo rules model quite powerful zooms up quickly Brother Matt critiquing launch thermalizers allowed 7 Unlimited attempts make three official rise-off-table flights allowed twominute max 8 highest flight total plus bonus points wins Flyoffs staged break ties addition rules Flying Aces Club has devised bonus system Em bryo Five seconds added raised cabin windscreen open cockpit headrest three seconds threedimensional wheel pants second three-dimensional exhaust pipes bonus seconds maximum nine added three-flight total final score Embry-omatic blends both ends spectrum model looks great also superb flier properly built trimmed itll amaze its big mod el flight characteristics airplane climbs off table easily shoots up ver tically like rocket several seconds After motor run well over minute Embry-omatic reaches altitude several hundred feet nearly max before starts its glide little treatise models per formance hasnt steered toward workshop dont know what will youre beginner dont let description airplanes performance daunt As quick glance plan will show Embry-omatic very simple straight forward construction just easy fly Almost anyone can build model achieve excellent results Go Construction Before begin building sure have proper materials wood espe cially must top quality Champion Model Products Old Timer Model Sup ply addresses end article sell firstrate wood type model Embry-omatic uses medium lightweight 46-sq balsa fuselage structure dium hard balsa wing stabi lizer leading trailing edges light A, /32 sheet balsa everywhere else Dont make model light sacrifice strength needs robust withstand rigors wind other outdoor fly ing hazards Now lets get building Fuselage Build two identical sides using favorite method resin glue such Titebond recommended its lasting strength fuselage sides drying make wing stabilizer rib templates 44 ply Cut out ribs lightweight balsa time fuselage sides will dry Because its curved profile fuse lage must completed off board Cut top bottom crosspieces using top view plan guide Install parts one doing best keep fuselage aligned Medium Hot Stuff another CyA cyanoacrylate glue should used during operation because its quick adhesion Take time itll come out right Once fuselage structure completed bend landing gear 42 music wire install balsa crosspiece per plan Again use CyA glue oper ation Make tight-fitting nose block hard balsa Thoroughly sand entire fuselage remove imperfections set aside covering later Wing leading trailing edges must fairly hard very straight high-quality wood should used Cover plans waxed paper plastic wrap pin down leading trailing edges over plan Position glue rib making sure its straight snug glue drying stabilizer may built same manner except spar may added struc ture still pinned plan Once ribs dry wing ready August 1990 57 author hand launching Embry-omatic during sequence low-power test flights adjust trim Its important have bright contrasting color scheme airplane gets very small reaches its max altitude good prop heart Embryo model Pictured Peck 7-in prop mounted its nose block its excellent choice Embryos very simple beginners Note reverse S-hooks essential preventing rubber climbing hook Full-Size Plans Available. Page 196 SOFT BALSA TIPS iF II III rLE 3/32 SQ rn 1/16 SQ SPARS DIHEDRAL 1/2 UNDER EACH TIP PANEL STAB RIB-6 FROM 1/32 3 FROM I/is 1/16 GUSSETS STIFF 1/16 SQK 2-1/16 50--- ___ 1/16 DOWELS FOR HARD BALSARUBBER BANDS NOSEBLOCK REVERSE S HOOK OPTIONAL PECK 7 PROP 1/20 1/16 50 LE AND TE -7 5/32 BALSA SHIM SOFT 1/16 SQ1 CROSSPIECES -J I/16x 1/32 1/16 SIDES MOTOR 25 LP I/B 2 LAMS 1/32 3/4 DIA BRAIDED t 1/16 x 3/16 WING RIBS MAKE II 1/32 SHI MAKE 2 OF EACH ALL 1/32 SHT 2 CROSS-GRAIN SQ STOP 1/16 1/32 SHT- SOFT/ 1/32 DIA BALSALG WIRE~ORTHO I/I6SHT BANDS 1/16 SHT040 50 BASS LCUT WINDSHIELD FROM BATTERY PACKAGE3/16 PECK FUSE ALL DIMENSIONS IN INCHES PROTOTYPE WT 15 GRAMS SCALE IN HE 0 234 56 MODEL AVIATION EMBRY-OMAT IC EMBRYO ENDURANCE MODEL DESIGNED DRAWN AND INKED BY-42d"L 27 JANUARY 1990 finishing setting dihedral First cut off wing tip proper lo cation remove plan Give panels light sanding create nice bevel leading trailing edge joints Block up tip proper angle per plan carefully glue Tite bond Allow hour drying remove work surface Install two spars gussets Sand lightly re move imperfections set aside fins last items built before model can covered Use very light A6 balsa Titebond glue may also want build small subrudder point omitted prototype plan add near future will sist model making smoother take off probably improve appearance Covering As rubber-powered models Japanese tissue material choice whove never used material its light strong easy work fine quality covering money Peck Micro-X Champion Old Timer carry several colors about 75 cents sheet Nitrate dope best adhering tis sue airframe Cover simple pieces first starting fuselage fins moving stabilizer wings gain experience airfoiled sides wing stab toughest cover flawlessly Take time surfaces work carefully Remember Continued page 186 58 Model Aviation Left stabilizer its dethermalized position tall pops up 600 angle using carpet thread reatrictor stab rear mount 1Aa ply Note all-important found label attached under stab Right tail Its flight position Its held down small dental bands prototype required small up-elevator trim shim just visible under trailing edge sure tail straight level before flying measuring sound its totalityis better realistic method measuring noise As saw above means increase rpm must reduce dB Conversely lower rpm dB can higher much higher lower find Out went back chart calcu lated effect both raising lowering rpm 6000 keeping distance ac ceptability constant case resulting change 6 dB means 1000 rpm 1 dB roughly equal ability irritate Therefore have determined field limit 90 dB 12000 rpm pilot wants fly 18000 rpm must drop 6 dB 84 dB other hand hes turning 6000 rpm gets 6 dB bonus can fly 96 dB still have same level noise simplii calculations can add dB rpm thousands together use answer field limit instance 90 dB 12000 rpm would equal 102 Any dB rpm combination adding up number less would acceptable Using criterion a~m plishes two things gives club much better noise control allows fliers use field having conform unreasonable dB level especially important anyone has low-frequency plane large two- fourstroke engine Four-stroke engines have ad vantage audio frequency onehalf rpm Thus using method four-strokes must remember calculate one-half measured rpm frequently case dB higher engines sound quieter twostrokes Gopher Canyon site set noise limit NF 96 dB plus rpm/bOO twostroke rpm/2000 four-stroke engines determined proximity neighbor about 1000 ft overfly area rural setting meet standard club set out vent new mufflers response mem bers terrific numbers designs varied inventors lot fun Den nis Caudle wrote program com puter assist designing tuned mufflers Ive found meeting noise levels use simple additional internal chambers soundabsorbing coatings Lowering rpm too essen tial surprise seem having success two-stroke engines fourstrokers As writing city council has voted unanimously give us full use field Th testing continues however Gopher Canyos has become headquarters studying sounc San Diego County latest experiments spectral analyzer have yielded some inter esting results Most clubs fly sites situated 4000 ft residential areas limit 90 dB 9 ft recommended AMA reasonable standard However urbanizatior continues residential growth closes ir around more flying fields welJ need accurate knowledge about levels 01 noise creating Measuring total sound output rather merely dB levels positive step controlling noise before causes loss flying site References Ernest J McCormick Hwnan Factors Engi neering 3rd ed New York McGraw-Hill Book Co 1970 pp 525-528 2 ISO Technical Committee 43 Acoustics Rat ing Noise Respect Hearing Conversation Speech Communication Annoyance Secretariat-189 August 1961 GF Abbott Flying Field Layout Meet Noise Criteria Model Aviation Nov 1987 pp 24-35 Editor grateful George F Abbott checking manuscript Gopher Canyon article offering several suggestions incorporated Embry-omatic/De Loach Continued page 58 grain tissue must run lengthwise structure being covered parts covered its time shrink tissue tight moistening Again start fuselage Thoroughly moisten covering water alcohol Dont worry about getting too wet structure wont warp Set fuse lage aside dry wing empennage another matter Shrinking tissue structures must done very carefully since will warp quite easily have airbrush mist surfaces lightly tiny amount water alcohol Without airbrush task little dif ficult case best lightly sprink ling fingertips warps occur can steamed Out over teakettle before Continued page 190 186 Model Aviation Fly Mc Daniel Power New Solid State On-Board Glow-Plug Drivers Now can drive 1 2 glow plugs efficiently automatically new McDaniel On-Board Glow-Plug Drivers engine 2 4 stroke glow has 1 2 cylinders Model 471 472 On-Board Glow-Plug Driver will ease jobs starting maintaining idle during taxiing power down flight maneuvers FEATURES INCLUDE Servo Reversing Optically Coupled Circuitry No RFI Automatic Shutdown Via TX RX Connector Plug Battery Pack Remote Glow Plug Indicator Panels Available Separately Battery Pack AC Charger NOT Included Available Separately See Year Local Hobby Dealer Contact McDaniel R/C IncVisa MC accepted 1654 Crofton Blvd Suite 4 Crofton MD 21114 e 301721-6303 301721-6306 II V flULUUI Made ot White Laminating Epoxy & Fiberglass Strong Lightweight No Pin Holes tle e Construction dor Available black red white sizes 1$325 2375 21/4425 2V2475 Spinners new Master Airscrew spinner series features aluminum backplate true running cones made engineering grade nylon strength resist starter burn spinners easily mounted two screws custom fit Master Airscrew propellers black red white See Hobby Dealer MASTER AIRSCREW propellers accessories WINDSOR PROPELLER CO 3219 Monier Circle Rancho Cordova CA 95742 Embry-omatic/De Loach Continued page 186 dope applied Once tissue properly shrunk warps removed surfaces can doped 50/50 mixture dope thinner well plasticized castor oil TCP tri-creosol phosphate four drops per ounce dope/thinner Assembly Glue %2 balsa shim under wing leading edge correct incidence shown plan Youll notice wing rubberbanded #10 rubberbands place rather glued may glue prefer popoff wing surely does help inevitable rough landings DT dethermalizer also optional al though strongly recommend installing Dont let models small size its Embryo status fool underestimating its perform ance potentialand consequent need dether malizer Like gutsy flier model will fol low wherever good thermal leadsin other words 005 out-of-sight Another reason dethermalizer enables adjust decalage small shims under trailing edge stabilizer rest case Before rigging stabilizer fuselage rudders subrudder youre building must glued place Embellishing model wheel pants make sure wheels rotate freely inside cock pit details windscreen headrest exhaust pipes made aluminum tubing CyAd place greatly improves appearance ex haust pipes shown plans exact placement unimportant As described ear lier detailing model will also earn bonus points Bend shaft seven-inch Peck gray plastic prop using reverse S-hook made /32 music wire Flying Its best start motor youll probably end up Use 25-in loop %-in rubber noted plan model built light should have motor should give excellent results Install motor balance model CG center-of-gravity location marked plan Add clay nose until balance achieved Test glide model over soft grass during calm early morning evening Adjust sta bilizer shims until airplane settles nsce floating glide Induce gentle right left glide turn adjusting rudder accordingly well wind about hundred turns first powered flight Gradually work way up more turns mak ing adjustments necessary Youll probably have put little downthrust did power builds up Also youll need shim little right left thrust model will circle un der power Try both right left thrust will work better other model haves differently Once again try everything see what works best model excitement really begins once model balanced trimmed flying correctly Now its time see just Embry-omatically airplane performsand believe perform word new FAI Model Supply tan rubber Im able crank 2500 turns yielding motor run easily minute half kind power dont forget light DT fuse Any questions about Embry-omatic may addressed author 3428 Bryn Mawr Dal las TX 75225 Suppliers Peck-Polymers PO Box 2498 La Mesa CA 92041 tissue props glue Old Timer Model Supply PO Box 7334 Van Nuys CA 91409 tissue wood wire props Champion Model Products 880 Carmen Court La Verne CA 91750 wood tissue DT fuse thodonix bands rubber lube FAI Model Supply PO Box 3957 Torrance CA 90510 rubber Bob Wilder 2010 Boston Irving TX 75061 201 winder Join NFFS today Penaud/Hannan Continued page 68 gan own first constructions Alleghany 1887 Langley did learn Pnaud 1872 1 Aeronaure article adopted Pnaud concepts some own aerodrome models Langleys planophore-type designs identi fled Aerodrome No 11 illustrated both drawing photograph Memoir Curiously Langley seems have employec twisted rubber power earliest models Perhaps may have learned some Francois Dandrieux butterflies widely marketed early 1879 would poetic justice indeed since butter flies commercial adaptations P6nauds Helicopters Two examples Dandricux models Smithsonian collection years Might Langley have brought Although constructed nearly 40 rubberpowered models before 1893 experimented wide variety configurations Langley achieved limited success can share frustration recalled wings general flat some cases curved rubber usually wound about 100 turns trou ble continually arose its kinldng une qual unwinding often caused erratic flights Langley also encountered frequent breakages After reading Pnauds 13-second duration planophore flight candidly wrote have never obtained good result rubber motor added longest flights obtainable did exceed six eight sec onds time nor 80 100 feet distance brief owing spas modic action rubber other causes ir regular extremely difficult obtain imperfect results actually de duced what would certainly appear have retrogressive move Langley turned during 1895 models powered rubber tension surprisingly gave poor results com plex weighty mechanisms models still exist Smithsonian collection Langley also considered rejected power plants employing gunpowder hot water com pressed air electricity carbon dioxide before achieving some success steam fi nally gasoline 1896 steam-powered Aero drome identified No 5 suggests revised numbering system unrelated rubber-driven model series Langley planophore type During 1920s Paul Garber now historian emeritus Ramsey Fellow National Air Space Museum touring Langleys long-dormant shop building Smithsonian Institution Among paraphernalia old model planophore configuration Garber asked es BLIILD*CD*MODELS* am sOll making wsId famous histonic inc modet plans aailable Foim 1/32 5/C C/L F/F ubben stetjo Ill tlnem anymt,e145t plans Real choiCe items Ask old time model 0500 ohotolanhle youaelt long, send Si * fo te CleoolandSesignd piotoojal catalog booklet bannially illustated pioe list St Foeign odd St Al MaiL Non I, Sam day seeioe hOot no dealoo enteR museums [Edund 7 Panku,d4ticlicn Bnl -innd CLEVELAND MODEL & SUPPLY 7B Dotnoit Cloteland OH 44102V-* TOURNAMENT CHAMPIONS Finals Las Vegas NVNov 9-11 Special Discounted Airfare Call Irene Gerny CONTEMPORARY TRAVEL 800-3360033 Outside NYS 516-360-3663 NYS 190 Model Aviation Leader Small Airfoil Technology
Edition: Model Aviation - 1990/08
Page Numbers: 56, 57, 58, 186, 190
56 Model Aviation EMBRYO ENDURANCE fun laidback event appeals ages beginner expert alike Much like Bostonian other popular fun event Embryo has re cently gained renewed following due large part its promotion both NFFS Flying Aces Club event originated West Coast back mid-Sixties rules listed below some slight changes rules still use today 1 The event rubber-powered models 50 sq wing area monoplanes 70 sq biplanes Stabilizer area exceed 50% wing area 2 Fuselage volume enclose space 125 x 150 x 3 larger 3 The wing tail built up covered both sides Japanese tissue equivalent 4 The model must ROG off card table top unassisted three-point rest 5 Landing gear legs must conven tional configuration have 34-in -dia wheels larger Example Two wheels landing gear prohibited etc 6 No folding feathering props de Top picture Embry-omatic ready fly model took first place Embryo Sr achieving two maxes third flight 98 sec 1989 NFFS US Outdoor Campion ships bad brand-new still roughly trimmed airplane its first contest present tis model tweaked point maxes almost flight Above Top view Embry-omatic showing exhaust pipes wheel pants open cockpit windscreen headrest earn bonus points under FAC Flying Aces Club Embryo rules Left The author right winds brother Matt hoids model 25 1/8-in tan rubber Embry-omatic its best author strongly advises installing dethermalizer model because its high performance capability Right Shes off push Note card table ROG required Embryo rules model quite powerful zooms up quickly Brother Matt critiquing launch thermalizers allowed 7 Unlimited attempts make three official rise-off-table flights allowed twominute max 8 highest flight total plus bonus points wins Flyoffs staged break ties addition rules Flying Aces Club has devised bonus system Em bryo Five seconds added raised cabin windscreen open cockpit headrest three seconds threedimensional wheel pants second three-dimensional exhaust pipes bonus seconds maximum nine added three-flight total final score Embry-omatic blends both ends spectrum model looks great also superb flier properly built trimmed itll amaze its big mod el flight characteristics airplane climbs off table easily shoots up ver tically like rocket several seconds After motor run well over minute Embry-omatic reaches altitude several hundred feet nearly max before starts its glide little treatise models per formance hasnt steered toward workshop dont know what will youre beginner dont let description airplanes performance daunt As quick glance plan will show Embry-omatic very simple straight forward construction just easy fly Almost anyone can build model achieve excellent results Go Construction Before begin building sure have proper materials wood espe cially must top quality Champion Model Products Old Timer Model Sup ply addresses end article sell firstrate wood type model Embry-omatic uses medium lightweight 46-sq balsa fuselage structure dium hard balsa wing stabi lizer leading trailing edges light A, /32 sheet balsa everywhere else Dont make model light sacrifice strength needs robust withstand rigors wind other outdoor fly ing hazards Now lets get building Fuselage Build two identical sides using favorite method resin glue such Titebond recommended its lasting strength fuselage sides drying make wing stabilizer rib templates 44 ply Cut out ribs lightweight balsa time fuselage sides will dry Because its curved profile fuse lage must completed off board Cut top bottom crosspieces using top view plan guide Install parts one doing best keep fuselage aligned Medium Hot Stuff another CyA cyanoacrylate glue should used during operation because its quick adhesion Take time itll come out right Once fuselage structure completed bend landing gear 42 music wire install balsa crosspiece per plan Again use CyA glue oper ation Make tight-fitting nose block hard balsa Thoroughly sand entire fuselage remove imperfections set aside covering later Wing leading trailing edges must fairly hard very straight high-quality wood should used Cover plans waxed paper plastic wrap pin down leading trailing edges over plan Position glue rib making sure its straight snug glue drying stabilizer may built same manner except spar may added struc ture still pinned plan Once ribs dry wing ready August 1990 57 author hand launching Embry-omatic during sequence low-power test flights adjust trim Its important have bright contrasting color scheme airplane gets very small reaches its max altitude good prop heart Embryo model Pictured Peck 7-in prop mounted its nose block its excellent choice Embryos very simple beginners Note reverse S-hooks essential preventing rubber climbing hook Full-Size Plans Available. Page 196 SOFT BALSA TIPS iF II III rLE 3/32 SQ rn 1/16 SQ SPARS DIHEDRAL 1/2 UNDER EACH TIP PANEL STAB RIB-6 FROM 1/32 3 FROM I/is 1/16 GUSSETS STIFF 1/16 SQK 2-1/16 50--- ___ 1/16 DOWELS FOR HARD BALSARUBBER BANDS NOSEBLOCK REVERSE S HOOK OPTIONAL PECK 7 PROP 1/20 1/16 50 LE AND TE -7 5/32 BALSA SHIM SOFT 1/16 SQ1 CROSSPIECES -J I/16x 1/32 1/16 SIDES MOTOR 25 LP I/B 2 LAMS 1/32 3/4 DIA BRAIDED t 1/16 x 3/16 WING RIBS MAKE II 1/32 SHI MAKE 2 OF EACH ALL 1/32 SHT 2 CROSS-GRAIN SQ STOP 1/16 1/32 SHT- SOFT/ 1/32 DIA BALSALG WIRE~ORTHO I/I6SHT BANDS 1/16 SHT040 50 BASS LCUT WINDSHIELD FROM BATTERY PACKAGE3/16 PECK FUSE ALL DIMENSIONS IN INCHES PROTOTYPE WT 15 GRAMS SCALE IN HE 0 234 56 MODEL AVIATION EMBRY-OMAT IC EMBRYO ENDURANCE MODEL DESIGNED DRAWN AND INKED BY-42d"L 27 JANUARY 1990 finishing setting dihedral First cut off wing tip proper lo cation remove plan Give panels light sanding create nice bevel leading trailing edge joints Block up tip proper angle per plan carefully glue Tite bond Allow hour drying remove work surface Install two spars gussets Sand lightly re move imperfections set aside fins last items built before model can covered Use very light A6 balsa Titebond glue may also want build small subrudder point omitted prototype plan add near future will sist model making smoother take off probably improve appearance Covering As rubber-powered models Japanese tissue material choice whove never used material its light strong easy work fine quality covering money Peck Micro-X Champion Old Timer carry several colors about 75 cents sheet Nitrate dope best adhering tis sue airframe Cover simple pieces first starting fuselage fins moving stabilizer wings gain experience airfoiled sides wing stab toughest cover flawlessly Take time surfaces work carefully Remember Continued page 186 58 Model Aviation Left stabilizer its dethermalized position tall pops up 600 angle using carpet thread reatrictor stab rear mount 1Aa ply Note all-important found label attached under stab Right tail Its flight position Its held down small dental bands prototype required small up-elevator trim shim just visible under trailing edge sure tail straight level before flying measuring sound its totalityis better realistic method measuring noise As saw above means increase rpm must reduce dB Conversely lower rpm dB can higher much higher lower find Out went back chart calcu lated effect both raising lowering rpm 6000 keeping distance ac ceptability constant case resulting change 6 dB means 1000 rpm 1 dB roughly equal ability irritate Therefore have determined field limit 90 dB 12000 rpm pilot wants fly 18000 rpm must drop 6 dB 84 dB other hand hes turning 6000 rpm gets 6 dB bonus can fly 96 dB still have same level noise simplii calculations can add dB rpm thousands together use answer field limit instance 90 dB 12000 rpm would equal 102 Any dB rpm combination adding up number less would acceptable Using criterion a~m plishes two things gives club much better noise control allows fliers use field having conform unreasonable dB level especially important anyone has low-frequency plane large two- fourstroke engine Four-stroke engines have ad vantage audio frequency onehalf rpm Thus using method four-strokes must remember calculate one-half measured rpm frequently case dB higher engines sound quieter twostrokes Gopher Canyon site set noise limit NF 96 dB plus rpm/bOO twostroke rpm/2000 four-stroke engines determined proximity neighbor about 1000 ft overfly area rural setting meet standard club set out vent new mufflers response mem bers terrific numbers designs varied inventors lot fun Den nis Caudle wrote program com puter assist designing tuned mufflers Ive found meeting noise levels use simple additional internal chambers soundabsorbing coatings Lowering rpm too essen tial surprise seem having success two-stroke engines fourstrokers As writing city council has voted unanimously give us full use field Th testing continues however Gopher Canyos has become headquarters studying sounc San Diego County latest experiments spectral analyzer have yielded some inter esting results Most clubs fly sites situated 4000 ft residential areas limit 90 dB 9 ft recommended AMA reasonable standard However urbanizatior continues residential growth closes ir around more flying fields welJ need accurate knowledge about levels 01 noise creating Measuring total sound output rather merely dB levels positive step controlling noise before causes loss flying site References Ernest J McCormick Hwnan Factors Engi neering 3rd ed New York McGraw-Hill Book Co 1970 pp 525-528 2 ISO Technical Committee 43 Acoustics Rat ing Noise Respect Hearing Conversation Speech Communication Annoyance Secretariat-189 August 1961 GF Abbott Flying Field Layout Meet Noise Criteria Model Aviation Nov 1987 pp 24-35 Editor grateful George F Abbott checking manuscript Gopher Canyon article offering several suggestions incorporated Embry-omatic/De Loach Continued page 58 grain tissue must run lengthwise structure being covered parts covered its time shrink tissue tight moistening Again start fuselage Thoroughly moisten covering water alcohol Dont worry about getting too wet structure wont warp Set fuse lage aside dry wing empennage another matter Shrinking tissue structures must done very carefully since will warp quite easily have airbrush mist surfaces lightly tiny amount water alcohol Without airbrush task little dif ficult case best lightly sprink ling fingertips warps occur can steamed Out over teakettle before Continued page 190 186 Model Aviation Fly Mc Daniel Power New Solid State On-Board Glow-Plug Drivers Now can drive 1 2 glow plugs efficiently automatically new McDaniel On-Board Glow-Plug Drivers engine 2 4 stroke glow has 1 2 cylinders Model 471 472 On-Board Glow-Plug Driver will ease jobs starting maintaining idle during taxiing power down flight maneuvers FEATURES INCLUDE Servo Reversing Optically Coupled Circuitry No RFI Automatic Shutdown Via TX RX Connector Plug Battery Pack Remote Glow Plug Indicator Panels Available Separately Battery Pack AC Charger NOT Included Available Separately See Year Local Hobby Dealer Contact McDaniel R/C IncVisa MC accepted 1654 Crofton Blvd Suite 4 Crofton MD 21114 e 301721-6303 301721-6306 II V flULUUI Made ot White Laminating Epoxy & Fiberglass Strong Lightweight No Pin Holes tle e Construction dor Available black red white sizes 1$325 2375 21/4425 2V2475 Spinners new Master Airscrew spinner series features aluminum backplate true running cones made engineering grade nylon strength resist starter burn spinners easily mounted two screws custom fit Master Airscrew propellers black red white See Hobby Dealer MASTER AIRSCREW propellers accessories WINDSOR PROPELLER CO 3219 Monier Circle Rancho Cordova CA 95742 Embry-omatic/De Loach Continued page 186 dope applied Once tissue properly shrunk warps removed surfaces can doped 50/50 mixture dope thinner well plasticized castor oil TCP tri-creosol phosphate four drops per ounce dope/thinner Assembly Glue %2 balsa shim under wing leading edge correct incidence shown plan Youll notice wing rubberbanded #10 rubberbands place rather glued may glue prefer popoff wing surely does help inevitable rough landings DT dethermalizer also optional al though strongly recommend installing Dont let models small size its Embryo status fool underestimating its perform ance potentialand consequent need dether malizer Like gutsy flier model will fol low wherever good thermal leadsin other words 005 out-of-sight Another reason dethermalizer enables adjust decalage small shims under trailing edge stabilizer rest case Before rigging stabilizer fuselage rudders subrudder youre building must glued place Embellishing model wheel pants make sure wheels rotate freely inside cock pit details windscreen headrest exhaust pipes made aluminum tubing CyAd place greatly improves appearance ex haust pipes shown plans exact placement unimportant As described ear lier detailing model will also earn bonus points Bend shaft seven-inch Peck gray plastic prop using reverse S-hook made /32 music wire Flying Its best start motor youll probably end up Use 25-in loop %-in rubber noted plan model built light should have motor should give excellent results Install motor balance model CG center-of-gravity location marked plan Add clay nose until balance achieved Test glide model over soft grass during calm early morning evening Adjust sta bilizer shims until airplane settles nsce floating glide Induce gentle right left glide turn adjusting rudder accordingly well wind about hundred turns first powered flight Gradually work way up more turns mak ing adjustments necessary Youll probably have put little downthrust did power builds up Also youll need shim little right left thrust model will circle un der power Try both right left thrust will work better other model haves differently Once again try everything see what works best model excitement really begins once model balanced trimmed flying correctly Now its time see just Embry-omatically airplane performsand believe perform word new FAI Model Supply tan rubber Im able crank 2500 turns yielding motor run easily minute half kind power dont forget light DT fuse Any questions about Embry-omatic may addressed author 3428 Bryn Mawr Dal las TX 75225 Suppliers Peck-Polymers PO Box 2498 La Mesa CA 92041 tissue props glue Old Timer Model Supply PO Box 7334 Van Nuys CA 91409 tissue wood wire props Champion Model Products 880 Carmen Court La Verne CA 91750 wood tissue DT fuse thodonix bands rubber lube FAI Model Supply PO Box 3957 Torrance CA 90510 rubber Bob Wilder 2010 Boston Irving TX 75061 201 winder Join NFFS today Penaud/Hannan Continued page 68 gan own first constructions Alleghany 1887 Langley did learn Pnaud 1872 1 Aeronaure article adopted Pnaud concepts some own aerodrome models Langleys planophore-type designs identi fled Aerodrome No 11 illustrated both drawing photograph Memoir Curiously Langley seems have employec twisted rubber power earliest models Perhaps may have learned some Francois Dandrieux butterflies widely marketed early 1879 would poetic justice indeed since butter flies commercial adaptations P6nauds Helicopters Two examples Dandricux models Smithsonian collection years Might Langley have brought Although constructed nearly 40 rubberpowered models before 1893 experimented wide variety configurations Langley achieved limited success can share frustration recalled wings general flat some cases curved rubber usually wound about 100 turns trou ble continually arose its kinldng une qual unwinding often caused erratic flights Langley also encountered frequent breakages After reading Pnauds 13-second duration planophore flight candidly wrote have never obtained good result rubber motor added longest flights obtainable did exceed six eight sec onds time nor 80 100 feet distance brief owing spas modic action rubber other causes ir regular extremely difficult obtain imperfect results actually de duced what would certainly appear have retrogressive move Langley turned during 1895 models powered rubber tension surprisingly gave poor results com plex weighty mechanisms models still exist Smithsonian collection Langley also considered rejected power plants employing gunpowder hot water com pressed air electricity carbon dioxide before achieving some success steam fi nally gasoline 1896 steam-powered Aero drome identified No 5 suggests revised numbering system unrelated rubber-driven model series Langley planophore type During 1920s Paul Garber now historian emeritus Ramsey Fellow National Air Space Museum touring Langleys long-dormant shop building Smithsonian Institution Among paraphernalia old model planophore configuration Garber asked es BLIILD*CD*MODELS* am sOll making wsId famous histonic inc modet plans aailable Foim 1/32 5/C C/L F/F ubben stetjo Ill tlnem anymt,e145t plans Real choiCe items Ask old time model 0500 ohotolanhle youaelt long, send Si * fo te CleoolandSesignd piotoojal catalog booklet bannially illustated pioe list St Foeign odd St Al MaiL Non I, Sam day seeioe hOot no dealoo enteR museums [Edund 7 Panku,d4ticlicn Bnl -innd CLEVELAND MODEL & SUPPLY 7B Dotnoit Cloteland OH 44102V-* TOURNAMENT CHAMPIONS Finals Las Vegas NVNov 9-11 Special Discounted Airfare Call Irene Gerny CONTEMPORARY TRAVEL 800-3360033 Outside NYS 516-360-3663 NYS 190 Model Aviation Leader Small Airfoil Technology
Edition: Model Aviation - 1990/08
Page Numbers: 56, 57, 58, 186, 190
56 Model Aviation EMBRYO ENDURANCE fun laidback event appeals ages beginner expert alike Much like Bostonian other popular fun event Embryo has re cently gained renewed following due large part its promotion both NFFS Flying Aces Club event originated West Coast back mid-Sixties rules listed below some slight changes rules still use today 1 The event rubber-powered models 50 sq wing area monoplanes 70 sq biplanes Stabilizer area exceed 50% wing area 2 Fuselage volume enclose space 125 x 150 x 3 larger 3 The wing tail built up covered both sides Japanese tissue equivalent 4 The model must ROG off card table top unassisted three-point rest 5 Landing gear legs must conven tional configuration have 34-in -dia wheels larger Example Two wheels landing gear prohibited etc 6 No folding feathering props de Top picture Embry-omatic ready fly model took first place Embryo Sr achieving two maxes third flight 98 sec 1989 NFFS US Outdoor Campion ships bad brand-new still roughly trimmed airplane its first contest present tis model tweaked point maxes almost flight Above Top view Embry-omatic showing exhaust pipes wheel pants open cockpit windscreen headrest earn bonus points under FAC Flying Aces Club Embryo rules Left The author right winds brother Matt hoids model 25 1/8-in tan rubber Embry-omatic its best author strongly advises installing dethermalizer model because its high performance capability Right Shes off push Note card table ROG required Embryo rules model quite powerful zooms up quickly Brother Matt critiquing launch thermalizers allowed 7 Unlimited attempts make three official rise-off-table flights allowed twominute max 8 highest flight total plus bonus points wins Flyoffs staged break ties addition rules Flying Aces Club has devised bonus system Em bryo Five seconds added raised cabin windscreen open cockpit headrest three seconds threedimensional wheel pants second three-dimensional exhaust pipes bonus seconds maximum nine added three-flight total final score Embry-omatic blends both ends spectrum model looks great also superb flier properly built trimmed itll amaze its big mod el flight characteristics airplane climbs off table easily shoots up ver tically like rocket several seconds After motor run well over minute Embry-omatic reaches altitude several hundred feet nearly max before starts its glide little treatise models per formance hasnt steered toward workshop dont know what will youre beginner dont let description airplanes performance daunt As quick glance plan will show Embry-omatic very simple straight forward construction just easy fly Almost anyone can build model achieve excellent results Go Construction Before begin building sure have proper materials wood espe cially must top quality Champion Model Products Old Timer Model Sup ply addresses end article sell firstrate wood type model Embry-omatic uses medium lightweight 46-sq balsa fuselage structure dium hard balsa wing stabi lizer leading trailing edges light A, /32 sheet balsa everywhere else Dont make model light sacrifice strength needs robust withstand rigors wind other outdoor fly ing hazards Now lets get building Fuselage Build two identical sides using favorite method resin glue such Titebond recommended its lasting strength fuselage sides drying make wing stabilizer rib templates 44 ply Cut out ribs lightweight balsa time fuselage sides will dry Because its curved profile fuse lage must completed off board Cut top bottom crosspieces using top view plan guide Install parts one doing best keep fuselage aligned Medium Hot Stuff another CyA cyanoacrylate glue should used during operation because its quick adhesion Take time itll come out right Once fuselage structure completed bend landing gear 42 music wire install balsa crosspiece per plan Again use CyA glue oper ation Make tight-fitting nose block hard balsa Thoroughly sand entire fuselage remove imperfections set aside covering later Wing leading trailing edges must fairly hard very straight high-quality wood should used Cover plans waxed paper plastic wrap pin down leading trailing edges over plan Position glue rib making sure its straight snug glue drying stabilizer may built same manner except spar may added struc ture still pinned plan Once ribs dry wing ready August 1990 57 author hand launching Embry-omatic during sequence low-power test flights adjust trim Its important have bright contrasting color scheme airplane gets very small reaches its max altitude good prop heart Embryo model Pictured Peck 7-in prop mounted its nose block its excellent choice Embryos very simple beginners Note reverse S-hooks essential preventing rubber climbing hook Full-Size Plans Available. Page 196 SOFT BALSA TIPS iF II III rLE 3/32 SQ rn 1/16 SQ SPARS DIHEDRAL 1/2 UNDER EACH TIP PANEL STAB RIB-6 FROM 1/32 3 FROM I/is 1/16 GUSSETS STIFF 1/16 SQK 2-1/16 50--- ___ 1/16 DOWELS FOR HARD BALSARUBBER BANDS NOSEBLOCK REVERSE S HOOK OPTIONAL PECK 7 PROP 1/20 1/16 50 LE AND TE -7 5/32 BALSA SHIM SOFT 1/16 SQ1 CROSSPIECES -J I/16x 1/32 1/16 SIDES MOTOR 25 LP I/B 2 LAMS 1/32 3/4 DIA BRAIDED t 1/16 x 3/16 WING RIBS MAKE II 1/32 SHI MAKE 2 OF EACH ALL 1/32 SHT 2 CROSS-GRAIN SQ STOP 1/16 1/32 SHT- SOFT/ 1/32 DIA BALSALG WIRE~ORTHO I/I6SHT BANDS 1/16 SHT040 50 BASS LCUT WINDSHIELD FROM BATTERY PACKAGE3/16 PECK FUSE ALL DIMENSIONS IN INCHES PROTOTYPE WT 15 GRAMS SCALE IN HE 0 234 56 MODEL AVIATION EMBRY-OMAT IC EMBRYO ENDURANCE MODEL DESIGNED DRAWN AND INKED BY-42d"L 27 JANUARY 1990 finishing setting dihedral First cut off wing tip proper lo cation remove plan Give panels light sanding create nice bevel leading trailing edge joints Block up tip proper angle per plan carefully glue Tite bond Allow hour drying remove work surface Install two spars gussets Sand lightly re move imperfections set aside fins last items built before model can covered Use very light A6 balsa Titebond glue may also want build small subrudder point omitted prototype plan add near future will sist model making smoother take off probably improve appearance Covering As rubber-powered models Japanese tissue material choice whove never used material its light strong easy work fine quality covering money Peck Micro-X Champion Old Timer carry several colors about 75 cents sheet Nitrate dope best adhering tis sue airframe Cover simple pieces first starting fuselage fins moving stabilizer wings gain experience airfoiled sides wing stab toughest cover flawlessly Take time surfaces work carefully Remember Continued page 186 58 Model Aviation Left stabilizer its dethermalized position tall pops up 600 angle using carpet thread reatrictor stab rear mount 1Aa ply Note all-important found label attached under stab Right tail Its flight position Its held down small dental bands prototype required small up-elevator trim shim just visible under trailing edge sure tail straight level before flying measuring sound its totalityis better realistic method measuring noise As saw above means increase rpm must reduce dB Conversely lower rpm dB can higher much higher lower find Out went back chart calcu lated effect both raising lowering rpm 6000 keeping distance ac ceptability constant case resulting change 6 dB means 1000 rpm 1 dB roughly equal ability irritate Therefore have determined field limit 90 dB 12000 rpm pilot wants fly 18000 rpm must drop 6 dB 84 dB other hand hes turning 6000 rpm gets 6 dB bonus can fly 96 dB still have same level noise simplii calculations can add dB rpm thousands together use answer field limit instance 90 dB 12000 rpm would equal 102 Any dB rpm combination adding up number less would acceptable Using criterion a~m plishes two things gives club much better noise control allows fliers use field having conform unreasonable dB level especially important anyone has low-frequency plane large two- fourstroke engine Four-stroke engines have ad vantage audio frequency onehalf rpm Thus using method four-strokes must remember calculate one-half measured rpm frequently case dB higher engines sound quieter twostrokes Gopher Canyon site set noise limit NF 96 dB plus rpm/bOO twostroke rpm/2000 four-stroke engines determined proximity neighbor about 1000 ft overfly area rural setting meet standard club set out vent new mufflers response mem bers terrific numbers designs varied inventors lot fun Den nis Caudle wrote program com puter assist designing tuned mufflers Ive found meeting noise levels use simple additional internal chambers soundabsorbing coatings Lowering rpm too essen tial surprise seem having success two-stroke engines fourstrokers As writing city council has voted unanimously give us full use field Th testing continues however Gopher Canyos has become headquarters studying sounc San Diego County latest experiments spectral analyzer have yielded some inter esting results Most clubs fly sites situated 4000 ft residential areas limit 90 dB 9 ft recommended AMA reasonable standard However urbanizatior continues residential growth closes ir around more flying fields welJ need accurate knowledge about levels 01 noise creating Measuring total sound output rather merely dB levels positive step controlling noise before causes loss flying site References Ernest J McCormick Hwnan Factors Engi neering 3rd ed New York McGraw-Hill Book Co 1970 pp 525-528 2 ISO Technical Committee 43 Acoustics Rat ing Noise Respect Hearing Conversation Speech Communication Annoyance Secretariat-189 August 1961 GF Abbott Flying Field Layout Meet Noise Criteria Model Aviation Nov 1987 pp 24-35 Editor grateful George F Abbott checking manuscript Gopher Canyon article offering several suggestions incorporated Embry-omatic/De Loach Continued page 58 grain tissue must run lengthwise structure being covered parts covered its time shrink tissue tight moistening Again start fuselage Thoroughly moisten covering water alcohol Dont worry about getting too wet structure wont warp Set fuse lage aside dry wing empennage another matter Shrinking tissue structures must done very carefully since will warp quite easily have airbrush mist surfaces lightly tiny amount water alcohol Without airbrush task little dif ficult case best lightly sprink ling fingertips warps occur can steamed Out over teakettle before Continued page 190 186 Model Aviation Fly Mc Daniel Power New Solid State On-Board Glow-Plug Drivers Now can drive 1 2 glow plugs efficiently automatically new McDaniel On-Board Glow-Plug Drivers engine 2 4 stroke glow has 1 2 cylinders Model 471 472 On-Board Glow-Plug Driver will ease jobs starting maintaining idle during taxiing power down flight maneuvers FEATURES INCLUDE Servo Reversing Optically Coupled Circuitry No RFI Automatic Shutdown Via TX RX Connector Plug Battery Pack Remote Glow Plug Indicator Panels Available Separately Battery Pack AC Charger NOT Included Available Separately See Year Local Hobby Dealer Contact McDaniel R/C IncVisa MC accepted 1654 Crofton Blvd Suite 4 Crofton MD 21114 e 301721-6303 301721-6306 II V flULUUI Made ot White Laminating Epoxy & Fiberglass Strong Lightweight No Pin Holes tle e Construction dor Available black red white sizes 1$325 2375 21/4425 2V2475 Spinners new Master Airscrew spinner series features aluminum backplate true running cones made engineering grade nylon strength resist starter burn spinners easily mounted two screws custom fit Master Airscrew propellers black red white See Hobby Dealer MASTER AIRSCREW propellers accessories WINDSOR PROPELLER CO 3219 Monier Circle Rancho Cordova CA 95742 Embry-omatic/De Loach Continued page 186 dope applied Once tissue properly shrunk warps removed surfaces can doped 50/50 mixture dope thinner well plasticized castor oil TCP tri-creosol phosphate four drops per ounce dope/thinner Assembly Glue %2 balsa shim under wing leading edge correct incidence shown plan Youll notice wing rubberbanded #10 rubberbands place rather glued may glue prefer popoff wing surely does help inevitable rough landings DT dethermalizer also optional al though strongly recommend installing Dont let models small size its Embryo status fool underestimating its perform ance potentialand consequent need dether malizer Like gutsy flier model will fol low wherever good thermal leadsin other words 005 out-of-sight Another reason dethermalizer enables adjust decalage small shims under trailing edge stabilizer rest case Before rigging stabilizer fuselage rudders subrudder youre building must glued place Embellishing model wheel pants make sure wheels rotate freely inside cock pit details windscreen headrest exhaust pipes made aluminum tubing CyAd place greatly improves appearance ex haust pipes shown plans exact placement unimportant As described ear lier detailing model will also earn bonus points Bend shaft seven-inch Peck gray plastic prop using reverse S-hook made /32 music wire Flying Its best start motor youll probably end up Use 25-in loop %-in rubber noted plan model built light should have motor should give excellent results Install motor balance model CG center-of-gravity location marked plan Add clay nose until balance achieved Test glide model over soft grass during calm early morning evening Adjust sta bilizer shims until airplane settles nsce floating glide Induce gentle right left glide turn adjusting rudder accordingly well wind about hundred turns first powered flight Gradually work way up more turns mak ing adjustments necessary Youll probably have put little downthrust did power builds up Also youll need shim little right left thrust model will circle un der power Try both right left thrust will work better other model haves differently Once again try everything see what works best model excitement really begins once model balanced trimmed flying correctly Now its time see just Embry-omatically airplane performsand believe perform word new FAI Model Supply tan rubber Im able crank 2500 turns yielding motor run easily minute half kind power dont forget light DT fuse Any questions about Embry-omatic may addressed author 3428 Bryn Mawr Dal las TX 75225 Suppliers Peck-Polymers PO Box 2498 La Mesa CA 92041 tissue props glue Old Timer Model Supply PO Box 7334 Van Nuys CA 91409 tissue wood wire props Champion Model Products 880 Carmen Court La Verne CA 91750 wood tissue DT fuse thodonix bands rubber lube FAI Model Supply PO Box 3957 Torrance CA 90510 rubber Bob Wilder 2010 Boston Irving TX 75061 201 winder Join NFFS today Penaud/Hannan Continued page 68 gan own first constructions Alleghany 1887 Langley did learn Pnaud 1872 1 Aeronaure article adopted Pnaud concepts some own aerodrome models Langleys planophore-type designs identi fled Aerodrome No 11 illustrated both drawing photograph Memoir Curiously Langley seems have employec twisted rubber power earliest models Perhaps may have learned some Francois Dandrieux butterflies widely marketed early 1879 would poetic justice indeed since butter flies commercial adaptations P6nauds Helicopters Two examples Dandricux models Smithsonian collection years Might Langley have brought Although constructed nearly 40 rubberpowered models before 1893 experimented wide variety configurations Langley achieved limited success can share frustration recalled wings general flat some cases curved rubber usually wound about 100 turns trou ble continually arose its kinldng une qual unwinding often caused erratic flights Langley also encountered frequent breakages After reading Pnauds 13-second duration planophore flight candidly wrote have never obtained good result rubber motor added longest flights obtainable did exceed six eight sec onds time nor 80 100 feet distance brief owing spas modic action rubber other causes ir regular extremely difficult obtain imperfect results actually de duced what would certainly appear have retrogressive move Langley turned during 1895 models powered rubber tension surprisingly gave poor results com plex weighty mechanisms models still exist Smithsonian collection Langley also considered rejected power plants employing gunpowder hot water com pressed air electricity carbon dioxide before achieving some success steam fi nally gasoline 1896 steam-powered Aero drome identified No 5 suggests revised numbering system unrelated rubber-driven model series Langley planophore type During 1920s Paul Garber now historian emeritus Ramsey Fellow National Air Space Museum touring Langleys long-dormant shop building Smithsonian Institution Among paraphernalia old model planophore configuration Garber asked es BLIILD*CD*MODELS* am sOll making wsId famous histonic inc modet plans aailable Foim 1/32 5/C C/L F/F ubben stetjo Ill tlnem anymt,e145t plans Real choiCe items Ask old time model 0500 ohotolanhle youaelt long, send Si * fo te CleoolandSesignd piotoojal catalog booklet bannially illustated pioe list St Foeign odd St Al MaiL Non I, Sam day seeioe hOot no dealoo enteR museums [Edund 7 Panku,d4ticlicn Bnl -innd CLEVELAND MODEL & SUPPLY 7B Dotnoit Cloteland OH 44102V-* TOURNAMENT CHAMPIONS Finals Las Vegas NVNov 9-11 Special Discounted Airfare Call Irene Gerny CONTEMPORARY TRAVEL 800-3360033 Outside NYS 516-360-3663 NYS 190 Model Aviation Leader Small Airfoil Technology