Free Flight UNOFFICIAL EVENTS Hey lets have contest for. starts out next thing know new free-flight event born Some die aborn ing early infancy some go hiber nation long periods enjoy occasional rebirth few grow mature official events growth official status often goal such event provides pleasure satisfaction occasion has served purpose An event enjoyed some popularity within Oakland Cloud Dusters fifties becomes re-born five-year intervals Half-A FAT event Engine displacement limited maximum 051 Cu Cox Racing Fuel equivalent permitted since stock Tee Dee engines dont run well itraight FAT fuel 10-sec engine run permitted max~ 3 min weight area rules FAT-Power apply 049powered model translates all-up weight 850 oz maximum wing area mere 186 sq Thats ounce two AMA-rule Half-A model scarcely half wing area specifications like its thrill minute Half-A FAT event often flown company Coupe dHiver rubberpower A/l towline glider events rounds out program small-size ver sions three models flown FAT world championship competition Some models class simply scaled-down FAT Power models others Duration specially designed class tend ing toward longish tail booms supersimple construction few models simply weighted AMA-class models satisfy wing loading requirements 300 sq model must weigh 137 oz doesnt tend promote flashy per formance Nevertheless such model quietly won event recently flashier models thrilling specta tors bottom scale size apparent level sophistication per70 m m \ Pp *~iLcixq C.-diludmi #p Wood ~pras rndkd j ribs1 aHqIC boom riby Fa/aceI 4ujre 5 sMUj7Jfr rmoamt hi mapqu din r f Egd view mc*ky Ciaivnce Matlie SAN OIEO OQNtCAS Bob Meuser haps top terms fun per buck Baby ROG showed PeckPolymers kit version December issue official AMA event such modelsClass ROG Stickand record stands unbelievable 21 mm 520 sec result super-human effort Joe Foster Joe Bilgri two decades ago keep event fun category various clubs have estab lished own rules latest A-6 class invented San Diego Orbiteers stands historical Class indoor events wing area limited 30 sq 6 refers maximum prop diameter maxi mum motorstick length Wood strips must least 1/16 sq sheetwood 1/32 thjck gentlemens agreement stock 1/16 sq wood used special strips cut lightweight sheet Condenser paper allowed must rather heavy variety furnished club plastic prop may used no sanding permitted Balsa props OK too blades must flat 1/32 wire specified allowing use 1 / 16 tubing nose bearing solid motorstick specified sufficiently strong support motor size must about 1/8 3/16 models fly rubber 0040 0060 in width batch domestic rubber stripped purpose club mem ber Narrow rubber sizes condenser paper can obtained Micro-X PO Box 1063 Lorain Ohio 44055 Models hand-launched A-6 one-design event can play around tail size wing aspect ratio outline shapes etc Designs tend toward moderate aspect ratios rec tangular outlines High aspect ratios might better aerodynamically because spar-size restriction high-aspectratio wing will weigh longish tail boom might enhance stability per formance would increase weight dozen entered first contest Most models flew 2 mm best 3 mm 24 sec models turn 6 8 ft circles can buzz around small gyms quite handily Rubber-Power Speed contests popular thirties speeds up 90 mph claimed short courses difficulty accurately timing throws shadow doubt over such claims however An unofficial speed event has held Nats three years under sponsorship National Free-Flight Society event also flown under NFFS rules Illinois 34 Model Aviation MAC and under other rules Flightmasters Southern California NFFS rules specify maximum lengtb span 36 Models must take off table top course length 200 ft andmodels must fly between goalposts set 200 feet apart finish line Twin-motor designstwin pushers twin tractors pusher-tractorssolve prop torque problem date have successful best speeds low 50s have made Jack Mc Cracken Jim Lewis Chris Matsuno using simple models conventional con figuration Torque real problem solved proper design adjust ment dozens other unofficial events being flown have re cently flown various clubs Well get by-n-by club has such events Id like hear about can tell others Chanceys Pantera Don Chancey along Bob Isaacson Jim Walters represented US towline glider event World Champs Bulgaria last year Dons latest finest comprising what learned World Champs what has day about Pantera basically same model flew World Champs See page 44Editor important differences wing structure has completely changed order eliminate flutter now basically same used Russians Isaenko Tchop Wings employing structural design can built light 120 grams Rusians still amply stiff survive zo6m launches two center panels wing horizon tal Prior World Champs used di hedral belween center panels circle towing seems unnecessary changed dihedral Hyperion V flat center dihedral just cant tell much difference An attractive feature wing wires go straight through fuselage have epoxied place packing wing wires removed making smaller model box fuselage similar construction Ektenkovs model very much Rus sian influenced Towing tips description Rus sian tow hook towline gliders appeared January issue tended show basic functions device foundation discussion Elton Drews Max-Aid unit reader could see similarities dif ferences between two systems Don Chancey supplies following informa tion technique using Russian system Ill try explain system ex plained US team Russians basically way saw fly similar way members US team flew towline large diameter about 50 lb test monofilament Nylon Com pared braided Dacron line used standard monofilament line doesnt snag weeds easily easy hands stretchy help windy thermal conditions See October issue Jim Walters discus sion use monofilament line start circle tow pull model top line let go slightly ahead As take few handfuls line pull nose down slightly quickly let go line model stalls picks up speed turns quickly because auto-rudder action instead simply let line go slack gradually model comes overhead model will slow starting its turn will drift quite ways downwind process As model turns back wind take up slack repeat process desire launch model first let drift far enough downwind 43 22 FLAT 3/16 5Q 1/4 WASH-OUT 1/20 SHEET02 X 02 TUE BULATORS 30% -77rT SPRUCE CENTER"~ SPRUCEBALSA TIPS BALSA B 6356 h line tight model comes out turn point run like crazy model will tow straight top line line tightened model will veer slightly glide-turn direction virtue zoom-launch action tow hook giving slight rudder continued page 80 20 459 2 r iii574 - 1/16 X 1/S SPRUCE VERY HARD BALSA T E 1/16 RIBS 1/32 -RIBS zzzzzz i/32 WEB X% 1/16 SPAR EKHTENKOV [ TYPE BOOM 51EL1021-CZECH HOOK 7 LBS TENSION V WING STAB TOTAL 452473 7175 524225 BALSA 2133] PROJ SPAN -3275 FRONT VIEW Pantera A/2 BY DON CHANCEY 1975 U IA TEAM MEMBER March 1976 35 Bud mdc hold regwur ad Road 1 D model rlalf-A built according PAl rule. comparIson isa Interesting iii I I I I lU1NiIiII\I.i\J.I%I/i IIEI 1auwaece4 6th Annual &wAT L4 #4 2 Pre-Season Radio System Check-up pcs December 15 1975April 301976 FULL TIME TECHNICIANS FACTORY TRAINED FINEST TEST EQUIPMENT NEW MODERN SHOP ONLY GENUINE FACTORY PARTS SFACTION GUARANTEED PRE-SEASON SPECIAL ONLY $2695 plus poslaqe Perform Transmitter Battery Load Check Perform Transmitter Crystal Frequency Count Perform Receiver Battery Load Check Check Battery Charging Circuit Tune Transmitter R F Check Receiver Sensitivity & Adjust Align Receiver RF IF Stages Check Receiver Logic Align Transmitter Encoder Check Servo Stalled Motor Current Repair parts additional Check Servo Mechanics Adjust Servo Centering Perform System Servo Noise Check Shock Test Complete Airborne System Range Check System System Flight Test Necessary Oe Kraft Great Lakes Inc 6787 Wales Ave PO Box 2182 North CantonOhio 11720 t Jack Yarger 216 199-8310 #er~ BankAmericard Master Charge Welcome SAVE MONEY TROPHIES OR TROPHY PARTS STOCK CUSTOM engraving figures walnut marble cups hardware etc REQUEST PRICES TOM SUTOR TROPHIES Rt 2 Box X438A Avon Park FIa 33825 813 453-3470 7 U PLANS FOR GAS MODELERS PATTERNS 42 Seeing P-24A$14 -SeSee,Cie 45 Boeing F4B-3 P12 $9 36 Fokken Tnipe SRi $7 47 Con Henk POE $15 - 30 Col B Sped XIII $10 47 Gehennk F11C2 $15 39 Col B Nieperl 7 $9 47 CoOC Beildine $11 Sopenilh Pp Gledielo 42 292 Sco4 Bee B$949SI Ileydel P017$10 FBI 2B&C $11 50 Peljh Fl PO$10 DIII Scool $9 92 Slineon OW SR7 $10 5Mo0nMBl$14 4Se $14 ipe 791$11 57 Co01EFeleen $15 BonbenS0 $12 $14 MeI, MB]$20 97 Lind Leek Syine $12 54 Sopen Spilfne$13MANY MANY MORE 4AM 5999 54 925 $20 25e te $25 50 HedenEenbe $16 71 DeogeeDC$$25 * 5OEIeWdeeeP5 $ 77EeE 7GPe522 5Ee$J7GPe$19 ESegge C 7$ $12 5G W 4 F4F 3$1549 P ne ng PA 5$ 5JonIeee U88$0soce seDAl $2 50CWohooeIeP4O$15RE SURE TO ADD2O 4 479 M Mo qon $12FOR HANDLING E INS FF Duration/Meuser continued paqe 35 deflection veering starts model about two-thirds way top desired moment give extra hard pull let slack line model will veer sharply climb its glide circle Dons description implies un latching two-ring keeper release tow ring take place simul taneously implies tow hook slopes downward tow hook slopes upward rear does the upper-left photo page 43 Janu ary issue ring wont come ofT hook until line allowed go slack usually accomplished jumping wildly air Some fliers have reported occasional difficulty getting line release hook Apparently Russians have licked problem premature unlatching ring keeper variation Russians have tried employs aileron goes action starting few seconds after model launched part Seelig timer normally used engine timing used actuate aileron dethermalizer part timer used its normal fashion timer started unlatching line keeper according Russian publication seems clear rather confident unlatching wont occur prema turely Don continues flying thermals use fact line securely attached lift encountered dont simply pull model top let off Tow top let model circle lift until absolutely sure making three five turns necessary sure have good lift zoom-launch Russians zoom launch flight just calm-air flights think lift downwind crosswind ge model over head out front get turned right direction run fast can toward thermal taking line hand-over-hand go As long keep tension line autorudder will keep model going straight Russians did lot flying very calm air change Dacron towlineone wont stretch stiffer line hook tension re quired unlatching will have decreased calm-air flying address 4200 Gregory St Oak land CA 94619 80 Model Aviation KRAFT r IeTEJEIEIEIVIRIS QUICKEST MAIL SERVIcE
Edition: Model Aviation - 1976/03
Page Numbers: 34, 35, 80
Free Flight UNOFFICIAL EVENTS Hey lets have contest for. starts out next thing know new free-flight event born Some die aborn ing early infancy some go hiber nation long periods enjoy occasional rebirth few grow mature official events growth official status often goal such event provides pleasure satisfaction occasion has served purpose An event enjoyed some popularity within Oakland Cloud Dusters fifties becomes re-born five-year intervals Half-A FAT event Engine displacement limited maximum 051 Cu Cox Racing Fuel equivalent permitted since stock Tee Dee engines dont run well itraight FAT fuel 10-sec engine run permitted max~ 3 min weight area rules FAT-Power apply 049powered model translates all-up weight 850 oz maximum wing area mere 186 sq Thats ounce two AMA-rule Half-A model scarcely half wing area specifications like its thrill minute Half-A FAT event often flown company Coupe dHiver rubberpower A/l towline glider events rounds out program small-size ver sions three models flown FAT world championship competition Some models class simply scaled-down FAT Power models others Duration specially designed class tend ing toward longish tail booms supersimple construction few models simply weighted AMA-class models satisfy wing loading requirements 300 sq model must weigh 137 oz doesnt tend promote flashy per formance Nevertheless such model quietly won event recently flashier models thrilling specta tors bottom scale size apparent level sophistication per70 m m \ Pp *~iLcixq C.-diludmi #p Wood ~pras rndkd j ribs1 aHqIC boom riby Fa/aceI 4ujre 5 sMUj7Jfr rmoamt hi mapqu din r f Egd view mc*ky Ciaivnce Matlie SAN OIEO OQNtCAS Bob Meuser haps top terms fun per buck Baby ROG showed PeckPolymers kit version December issue official AMA event such modelsClass ROG Stickand record stands unbelievable 21 mm 520 sec result super-human effort Joe Foster Joe Bilgri two decades ago keep event fun category various clubs have estab lished own rules latest A-6 class invented San Diego Orbiteers stands historical Class indoor events wing area limited 30 sq 6 refers maximum prop diameter maxi mum motorstick length Wood strips must least 1/16 sq sheetwood 1/32 thjck gentlemens agreement stock 1/16 sq wood used special strips cut lightweight sheet Condenser paper allowed must rather heavy variety furnished club plastic prop may used no sanding permitted Balsa props OK too blades must flat 1/32 wire specified allowing use 1 / 16 tubing nose bearing solid motorstick specified sufficiently strong support motor size must about 1/8 3/16 models fly rubber 0040 0060 in width batch domestic rubber stripped purpose club mem ber Narrow rubber sizes condenser paper can obtained Micro-X PO Box 1063 Lorain Ohio 44055 Models hand-launched A-6 one-design event can play around tail size wing aspect ratio outline shapes etc Designs tend toward moderate aspect ratios rec tangular outlines High aspect ratios might better aerodynamically because spar-size restriction high-aspectratio wing will weigh longish tail boom might enhance stability per formance would increase weight dozen entered first contest Most models flew 2 mm best 3 mm 24 sec models turn 6 8 ft circles can buzz around small gyms quite handily Rubber-Power Speed contests popular thirties speeds up 90 mph claimed short courses difficulty accurately timing throws shadow doubt over such claims however An unofficial speed event has held Nats three years under sponsorship National Free-Flight Society event also flown under NFFS rules Illinois 34 Model Aviation MAC and under other rules Flightmasters Southern California NFFS rules specify maximum lengtb span 36 Models must take off table top course length 200 ft andmodels must fly between goalposts set 200 feet apart finish line Twin-motor designstwin pushers twin tractors pusher-tractorssolve prop torque problem date have successful best speeds low 50s have made Jack Mc Cracken Jim Lewis Chris Matsuno using simple models conventional con figuration Torque real problem solved proper design adjust ment dozens other unofficial events being flown have re cently flown various clubs Well get by-n-by club has such events Id like hear about can tell others Chanceys Pantera Don Chancey along Bob Isaacson Jim Walters represented US towline glider event World Champs Bulgaria last year Dons latest finest comprising what learned World Champs what has day about Pantera basically same model flew World Champs See page 44Editor important differences wing structure has completely changed order eliminate flutter now basically same used Russians Isaenko Tchop Wings employing structural design can built light 120 grams Rusians still amply stiff survive zo6m launches two center panels wing horizon tal Prior World Champs used di hedral belween center panels circle towing seems unnecessary changed dihedral Hyperion V flat center dihedral just cant tell much difference An attractive feature wing wires go straight through fuselage have epoxied place packing wing wires removed making smaller model box fuselage similar construction Ektenkovs model very much Rus sian influenced Towing tips description Rus sian tow hook towline gliders appeared January issue tended show basic functions device foundation discussion Elton Drews Max-Aid unit reader could see similarities dif ferences between two systems Don Chancey supplies following informa tion technique using Russian system Ill try explain system ex plained US team Russians basically way saw fly similar way members US team flew towline large diameter about 50 lb test monofilament Nylon Com pared braided Dacron line used standard monofilament line doesnt snag weeds easily easy hands stretchy help windy thermal conditions See October issue Jim Walters discus sion use monofilament line start circle tow pull model top line let go slightly ahead As take few handfuls line pull nose down slightly quickly let go line model stalls picks up speed turns quickly because auto-rudder action instead simply let line go slack gradually model comes overhead model will slow starting its turn will drift quite ways downwind process As model turns back wind take up slack repeat process desire launch model first let drift far enough downwind 43 22 FLAT 3/16 5Q 1/4 WASH-OUT 1/20 SHEET02 X 02 TUE BULATORS 30% -77rT SPRUCE CENTER"~ SPRUCEBALSA TIPS BALSA B 6356 h line tight model comes out turn point run like crazy model will tow straight top line line tightened model will veer slightly glide-turn direction virtue zoom-launch action tow hook giving slight rudder continued page 80 20 459 2 r iii574 - 1/16 X 1/S SPRUCE VERY HARD BALSA T E 1/16 RIBS 1/32 -RIBS zzzzzz i/32 WEB X% 1/16 SPAR EKHTENKOV [ TYPE BOOM 51EL1021-CZECH HOOK 7 LBS TENSION V WING STAB TOTAL 452473 7175 524225 BALSA 2133] PROJ SPAN -3275 FRONT VIEW Pantera A/2 BY DON CHANCEY 1975 U IA TEAM MEMBER March 1976 35 Bud mdc hold regwur ad Road 1 D model rlalf-A built according PAl rule. comparIson isa Interesting iii I I I I lU1NiIiII\I.i\J.I%I/i IIEI 1auwaece4 6th Annual &wAT L4 #4 2 Pre-Season Radio System Check-up pcs December 15 1975April 301976 FULL TIME TECHNICIANS FACTORY TRAINED FINEST TEST EQUIPMENT NEW MODERN SHOP ONLY GENUINE FACTORY PARTS SFACTION GUARANTEED PRE-SEASON SPECIAL ONLY $2695 plus poslaqe Perform Transmitter Battery Load Check Perform Transmitter Crystal Frequency Count Perform Receiver Battery Load Check Check Battery Charging Circuit Tune Transmitter R F Check Receiver Sensitivity & Adjust Align Receiver RF IF Stages Check Receiver Logic Align Transmitter Encoder Check Servo Stalled Motor Current Repair parts additional Check Servo Mechanics Adjust Servo Centering Perform System Servo Noise Check Shock Test Complete Airborne System Range Check System System Flight Test Necessary Oe Kraft Great Lakes Inc 6787 Wales Ave PO Box 2182 North CantonOhio 11720 t Jack Yarger 216 199-8310 #er~ BankAmericard Master Charge Welcome SAVE MONEY TROPHIES OR TROPHY PARTS STOCK CUSTOM engraving figures walnut marble cups hardware etc REQUEST PRICES TOM SUTOR TROPHIES Rt 2 Box X438A Avon Park FIa 33825 813 453-3470 7 U PLANS FOR GAS MODELERS PATTERNS 42 Seeing P-24A$14 -SeSee,Cie 45 Boeing F4B-3 P12 $9 36 Fokken Tnipe SRi $7 47 Con Henk POE $15 - 30 Col B Sped XIII $10 47 Gehennk F11C2 $15 39 Col B Nieperl 7 $9 47 CoOC Beildine $11 Sopenilh Pp Gledielo 42 292 Sco4 Bee B$949SI Ileydel P017$10 FBI 2B&C $11 50 Peljh Fl PO$10 DIII Scool $9 92 Slineon OW SR7 $10 5Mo0nMBl$14 4Se $14 ipe 791$11 57 Co01EFeleen $15 BonbenS0 $12 $14 MeI, MB]$20 97 Lind Leek Syine $12 54 Sopen Spilfne$13MANY MANY MORE 4AM 5999 54 925 $20 25e te $25 50 HedenEenbe $16 71 DeogeeDC$$25 * 5OEIeWdeeeP5 $ 77EeE 7GPe522 5Ee$J7GPe$19 ESegge C 7$ $12 5G W 4 F4F 3$1549 P ne ng PA 5$ 5JonIeee U88$0soce seDAl $2 50CWohooeIeP4O$15RE SURE TO ADD2O 4 479 M Mo qon $12FOR HANDLING E INS FF Duration/Meuser continued paqe 35 deflection veering starts model about two-thirds way top desired moment give extra hard pull let slack line model will veer sharply climb its glide circle Dons description implies un latching two-ring keeper release tow ring take place simul taneously implies tow hook slopes downward tow hook slopes upward rear does the upper-left photo page 43 Janu ary issue ring wont come ofT hook until line allowed go slack usually accomplished jumping wildly air Some fliers have reported occasional difficulty getting line release hook Apparently Russians have licked problem premature unlatching ring keeper variation Russians have tried employs aileron goes action starting few seconds after model launched part Seelig timer normally used engine timing used actuate aileron dethermalizer part timer used its normal fashion timer started unlatching line keeper according Russian publication seems clear rather confident unlatching wont occur prema turely Don continues flying thermals use fact line securely attached lift encountered dont simply pull model top let off Tow top let model circle lift until absolutely sure making three five turns necessary sure have good lift zoom-launch Russians zoom launch flight just calm-air flights think lift downwind crosswind ge model over head out front get turned right direction run fast can toward thermal taking line hand-over-hand go As long keep tension line autorudder will keep model going straight Russians did lot flying very calm air change Dacron towlineone wont stretch stiffer line hook tension re quired unlatching will have decreased calm-air flying address 4200 Gregory St Oak land CA 94619 80 Model Aviation KRAFT r IeTEJEIEIEIVIRIS QUICKEST MAIL SERVIcE
Edition: Model Aviation - 1976/03
Page Numbers: 34, 35, 80
Free Flight UNOFFICIAL EVENTS Hey lets have contest for. starts out next thing know new free-flight event born Some die aborn ing early infancy some go hiber nation long periods enjoy occasional rebirth few grow mature official events growth official status often goal such event provides pleasure satisfaction occasion has served purpose An event enjoyed some popularity within Oakland Cloud Dusters fifties becomes re-born five-year intervals Half-A FAT event Engine displacement limited maximum 051 Cu Cox Racing Fuel equivalent permitted since stock Tee Dee engines dont run well itraight FAT fuel 10-sec engine run permitted max~ 3 min weight area rules FAT-Power apply 049powered model translates all-up weight 850 oz maximum wing area mere 186 sq Thats ounce two AMA-rule Half-A model scarcely half wing area specifications like its thrill minute Half-A FAT event often flown company Coupe dHiver rubberpower A/l towline glider events rounds out program small-size ver sions three models flown FAT world championship competition Some models class simply scaled-down FAT Power models others Duration specially designed class tend ing toward longish tail booms supersimple construction few models simply weighted AMA-class models satisfy wing loading requirements 300 sq model must weigh 137 oz doesnt tend promote flashy per formance Nevertheless such model quietly won event recently flashier models thrilling specta tors bottom scale size apparent level sophistication per70 m m \ Pp *~iLcixq C.-diludmi #p Wood ~pras rndkd j ribs1 aHqIC boom riby Fa/aceI 4ujre 5 sMUj7Jfr rmoamt hi mapqu din r f Egd view mc*ky Ciaivnce Matlie SAN OIEO OQNtCAS Bob Meuser haps top terms fun per buck Baby ROG showed PeckPolymers kit version December issue official AMA event such modelsClass ROG Stickand record stands unbelievable 21 mm 520 sec result super-human effort Joe Foster Joe Bilgri two decades ago keep event fun category various clubs have estab lished own rules latest A-6 class invented San Diego Orbiteers stands historical Class indoor events wing area limited 30 sq 6 refers maximum prop diameter maxi mum motorstick length Wood strips must least 1/16 sq sheetwood 1/32 thjck gentlemens agreement stock 1/16 sq wood used special strips cut lightweight sheet Condenser paper allowed must rather heavy variety furnished club plastic prop may used no sanding permitted Balsa props OK too blades must flat 1/32 wire specified allowing use 1 / 16 tubing nose bearing solid motorstick specified sufficiently strong support motor size must about 1/8 3/16 models fly rubber 0040 0060 in width batch domestic rubber stripped purpose club mem ber Narrow rubber sizes condenser paper can obtained Micro-X PO Box 1063 Lorain Ohio 44055 Models hand-launched A-6 one-design event can play around tail size wing aspect ratio outline shapes etc Designs tend toward moderate aspect ratios rec tangular outlines High aspect ratios might better aerodynamically because spar-size restriction high-aspectratio wing will weigh longish tail boom might enhance stability per formance would increase weight dozen entered first contest Most models flew 2 mm best 3 mm 24 sec models turn 6 8 ft circles can buzz around small gyms quite handily Rubber-Power Speed contests popular thirties speeds up 90 mph claimed short courses difficulty accurately timing throws shadow doubt over such claims however An unofficial speed event has held Nats three years under sponsorship National Free-Flight Society event also flown under NFFS rules Illinois 34 Model Aviation MAC and under other rules Flightmasters Southern California NFFS rules specify maximum lengtb span 36 Models must take off table top course length 200 ft andmodels must fly between goalposts set 200 feet apart finish line Twin-motor designstwin pushers twin tractors pusher-tractorssolve prop torque problem date have successful best speeds low 50s have made Jack Mc Cracken Jim Lewis Chris Matsuno using simple models conventional con figuration Torque real problem solved proper design adjust ment dozens other unofficial events being flown have re cently flown various clubs Well get by-n-by club has such events Id like hear about can tell others Chanceys Pantera Don Chancey along Bob Isaacson Jim Walters represented US towline glider event World Champs Bulgaria last year Dons latest finest comprising what learned World Champs what has day about Pantera basically same model flew World Champs See page 44Editor important differences wing structure has completely changed order eliminate flutter now basically same used Russians Isaenko Tchop Wings employing structural design can built light 120 grams Rusians still amply stiff survive zo6m launches two center panels wing horizon tal Prior World Champs used di hedral belween center panels circle towing seems unnecessary changed dihedral Hyperion V flat center dihedral just cant tell much difference An attractive feature wing wires go straight through fuselage have epoxied place packing wing wires removed making smaller model box fuselage similar construction Ektenkovs model very much Rus sian influenced Towing tips description Rus sian tow hook towline gliders appeared January issue tended show basic functions device foundation discussion Elton Drews Max-Aid unit reader could see similarities dif ferences between two systems Don Chancey supplies following informa tion technique using Russian system Ill try explain system ex plained US team Russians basically way saw fly similar way members US team flew towline large diameter about 50 lb test monofilament Nylon Com pared braided Dacron line used standard monofilament line doesnt snag weeds easily easy hands stretchy help windy thermal conditions See October issue Jim Walters discus sion use monofilament line start circle tow pull model top line let go slightly ahead As take few handfuls line pull nose down slightly quickly let go line model stalls picks up speed turns quickly because auto-rudder action instead simply let line go slack gradually model comes overhead model will slow starting its turn will drift quite ways downwind process As model turns back wind take up slack repeat process desire launch model first let drift far enough downwind 43 22 FLAT 3/16 5Q 1/4 WASH-OUT 1/20 SHEET02 X 02 TUE BULATORS 30% -77rT SPRUCE CENTER"~ SPRUCEBALSA TIPS BALSA B 6356 h line tight model comes out turn point run like crazy model will tow straight top line line tightened model will veer slightly glide-turn direction virtue zoom-launch action tow hook giving slight rudder continued page 80 20 459 2 r iii574 - 1/16 X 1/S SPRUCE VERY HARD BALSA T E 1/16 RIBS 1/32 -RIBS zzzzzz i/32 WEB X% 1/16 SPAR EKHTENKOV [ TYPE BOOM 51EL1021-CZECH HOOK 7 LBS TENSION V WING STAB TOTAL 452473 7175 524225 BALSA 2133] PROJ SPAN -3275 FRONT VIEW Pantera A/2 BY DON CHANCEY 1975 U IA TEAM MEMBER March 1976 35 Bud mdc hold regwur ad Road 1 D model rlalf-A built according PAl rule. comparIson isa Interesting iii I I I I lU1NiIiII\I.i\J.I%I/i IIEI 1auwaece4 6th Annual &wAT L4 #4 2 Pre-Season Radio System Check-up pcs December 15 1975April 301976 FULL TIME TECHNICIANS FACTORY TRAINED FINEST TEST EQUIPMENT NEW MODERN SHOP ONLY GENUINE FACTORY PARTS SFACTION GUARANTEED PRE-SEASON SPECIAL ONLY $2695 plus poslaqe Perform Transmitter Battery Load Check Perform Transmitter Crystal Frequency Count Perform Receiver Battery Load Check Check Battery Charging Circuit Tune Transmitter R F Check Receiver Sensitivity & Adjust Align Receiver RF IF Stages Check Receiver Logic Align Transmitter Encoder Check Servo Stalled Motor Current Repair parts additional Check Servo Mechanics Adjust Servo Centering Perform System Servo Noise Check Shock Test Complete Airborne System Range Check System System Flight Test Necessary Oe Kraft Great Lakes Inc 6787 Wales Ave PO Box 2182 North CantonOhio 11720 t Jack Yarger 216 199-8310 #er~ BankAmericard Master Charge Welcome SAVE MONEY TROPHIES OR TROPHY PARTS STOCK CUSTOM engraving figures walnut marble cups hardware etc REQUEST PRICES TOM SUTOR TROPHIES Rt 2 Box X438A Avon Park FIa 33825 813 453-3470 7 U PLANS FOR GAS MODELERS PATTERNS 42 Seeing P-24A$14 -SeSee,Cie 45 Boeing F4B-3 P12 $9 36 Fokken Tnipe SRi $7 47 Con Henk POE $15 - 30 Col B Sped XIII $10 47 Gehennk F11C2 $15 39 Col B Nieperl 7 $9 47 CoOC Beildine $11 Sopenilh Pp Gledielo 42 292 Sco4 Bee B$949SI Ileydel P017$10 FBI 2B&C $11 50 Peljh Fl PO$10 DIII Scool $9 92 Slineon OW SR7 $10 5Mo0nMBl$14 4Se $14 ipe 791$11 57 Co01EFeleen $15 BonbenS0 $12 $14 MeI, MB]$20 97 Lind Leek Syine $12 54 Sopen Spilfne$13MANY MANY MORE 4AM 5999 54 925 $20 25e te $25 50 HedenEenbe $16 71 DeogeeDC$$25 * 5OEIeWdeeeP5 $ 77EeE 7GPe522 5Ee$J7GPe$19 ESegge C 7$ $12 5G W 4 F4F 3$1549 P ne ng PA 5$ 5JonIeee U88$0soce seDAl $2 50CWohooeIeP4O$15RE SURE TO ADD2O 4 479 M Mo qon $12FOR HANDLING E INS FF Duration/Meuser continued paqe 35 deflection veering starts model about two-thirds way top desired moment give extra hard pull let slack line model will veer sharply climb its glide circle Dons description implies un latching two-ring keeper release tow ring take place simul taneously implies tow hook slopes downward tow hook slopes upward rear does the upper-left photo page 43 Janu ary issue ring wont come ofT hook until line allowed go slack usually accomplished jumping wildly air Some fliers have reported occasional difficulty getting line release hook Apparently Russians have licked problem premature unlatching ring keeper variation Russians have tried employs aileron goes action starting few seconds after model launched part Seelig timer normally used engine timing used actuate aileron dethermalizer part timer used its normal fashion timer started unlatching line keeper according Russian publication seems clear rather confident unlatching wont occur prema turely Don continues flying thermals use fact line securely attached lift encountered dont simply pull model top let off Tow top let model circle lift until absolutely sure making three five turns necessary sure have good lift zoom-launch Russians zoom launch flight just calm-air flights think lift downwind crosswind ge model over head out front get turned right direction run fast can toward thermal taking line hand-over-hand go As long keep tension line autorudder will keep model going straight Russians did lot flying very calm air change Dacron towlineone wont stretch stiffer line hook tension re quired unlatching will have decreased calm-air flying address 4200 Gregory St Oak land CA 94619 80 Model Aviation KRAFT r IeTEJEIEIEIVIRIS QUICKEST MAIL SERVIcE