Fee Flight Duration Bob Meuser TRIPPER STRIPS Moe Whittemore writing CIA Informer thats Central Indiana Aeromodellers folks presents some interesting results tests tripper strips applied Indoor Hand-Launch Glider Trippers de scribed Bruce Carmichaels paper 1978 NFFS Symposium report recall Hank Cole using several decades ago Moes trippers look like trippers 35 percent chord width 012 015 high centers five strips located following dis tances leading edge expressed percentage chord 285 418 538 653 778 Moe made test glides glider trippers obtaining following results averaged over13 flights Without TrippersTrippers Sink rate ft/sec 119 109 Glide speed ft/sec 856 962 Glide slope1 70951 8595 Lift coefficient 0896 0789 nutshell trippers make glide faster flatter reduce sinking rate Moe says addition trippers increased launch altitude Vi higher glide speed B 1049 25095 4129 55142 7134 85102 95063 should result better penetration Out door model ability cope turbulence make rib template big deal made Terrific Comeback 1963 after quarter-century absence model aviation started Square areas Department Ribs tried cardboard scratch off list polysty rene sheet thats two plywoodmod-av style 1/32 1/16 barely OK model perhapsbut get chewed up razor blades easily material isnt easy work fairly expensive Brass OK hard can solder helps well Ckristian Sckwartzbadis Wakefield Prop C 30 45 61 71 72 57 33 DE 5804 5411 4526 3647 2665 2267 2760 come later Aluminum course Hard like 2024-T6 can get cant softer stuff makes Use sharp tin snips new-ish fine-tooth file cuts quickly accurately scribed line Soft aluminum clogs files oiling file lightly first helps standard file cleaner essential process case End Problem Ive actually known guys draw around template onto balsa sheet using ball-point pen manufacturing own printwood cut lines freehand razor X-Acto knife has dumbest way world cut ribs discard out-of-hand - the best possible reasons Im prejudiced Youre supposed Cut around template End Problem Two next problem prevent template o b% F FGdeg 095710 150567 193450 213355 210286 167235 101208 Non-slip rib templates Template itself metal Bob likes aluminum pins steel Bud Romak uses method left Bob the right Pick favorite slithering around sheet-wood cutting tried two-faced stickum tape stuck either too well too poorly either disaster Coarse sandpaper strips glued template does fair job far ideal Recently Bud Romak pulled out bunch templates illustrate some airfoil sections using template two three common pins pushed through holes drilled purpose epoxied place Someone remarked seemed like snazzy idea Bud retorted though everybody did way way turns out system latched onto after trying others following Terrific Comeback described first columns inAmerican ire raft Modeler about decade ago Buds system bit better tiny bit work bends pins first resulting lots glue area leave straight epoxy place snip off hojes left pins make easy stack ribs final sanding youre stinker uniformity End Problem Three Ervs again Messing around FAI Indoor model specs Hell really catch old diehards reigning World Indoor Champ Erv Rodemsky has come up 52 Model Aviation Larry Kruaes rgo moOeIIaCKIng urateenjoys inc uuious aissincsion OT naving won ruora Mats 4th place awards other model living dead L Kruse photo --- 2 ogies having left out chart values last month Props kaft winners past perhaps wed best pay attention Erv points Out rules simple FAI Indoor first became World Championship event nearly quarter-century ago Span limited 90cm 354 no minimum weight rule shipping such large models difficult few interested few World Champs cancelled Against strong US opposition span reduced present 65cm 276 limit ease trans portation problem Later minimum weight limit gram model rubber added ensure greater durability make easier participants countries ultra-light balsa simply available Participation increased Ten years development under rules however has seen changes trend has toward wide chords large overall lengths larger props greater weight rubber result models spend lot time banging rafters again quite fragile resulting models hanging up being destroyed longer length results same old shipping problems Erv points out recent teamselection Finals virtually world-class modeler blew least model Cezar Banks destroyed six Romak six Harlan three Cailliau three Erv thinks something should done make models rugged climb high make easier carry proposes following 1 maximum wing span 60 cm 236 2 maximum overall length excluding prop 60 cm 3 minimum weight excluding rubber 1 gram 4 projected area wings tail 1200 sq cm 186 sq 5 maximum motor weight 05 gram 6 geared motors mechanisms change prop pitch Bob really appreciates Windsor Propeller Co balsa stripper thoughts column angies flying surfaces flight prohibited points out could hand-carried aboard configuration changes must aeroelastic airliners limit least airline 9 x Such model would fit two-foot box Erv Continued page 122 - -r77\ I /I Q_ ffijz~j / HiiJIi Heres structure Wake-Up Wakefield-class model being kitted Champion Model Products 880 Carmen Court LaVerne CA91 750 Its first Wakefield kit US maybe quarter-century Price high its performance Read about column LiII February 1982 53 DOD Meuser lives ir .u .y received NFFS Modelof YearAwardforhis achievement ~mm. nw Bob knows secrets. Simplexs rubb-,orwinder isuiu,-iiu except standard hand-drill gears also uses ball thrust-bearing Assembled screws snap-rihgs can field-stripped very easily cleaning Jim Crocket sells drill/winder Bob has description column R/CIITMI- P7-F TIGERCAT Send 500 aiRIOg 216 499-5323 RC Kits Mfg UOH 44721 fiOzrfliddO PROPELLERS Made P0 yeste bo color Go GRISH No 1 propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 53each 545354Mc 6364Mc 747678Mc 848688c 949697 98104106Mc 114116118SI 124125126SuB 2 Blade Pusher 5/ 3 544 6364USc 86Mc 96106Si 3 Blade Tractor 53 6364 flOe 3 Blade Pusher 63Mc Metallic Aluminum Color Tractor 717651 8688S1Z 96 1061045130 P,sher06sim GRISH LARGE WOOD PROPELLERS HARDWOOD too hardr minimizes costly plane engine damage True pitch airfoil fully finished balanced ready coating 318 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 2O 8 27 10 24 13 NEWSIZE IN B&1OPITCH 26 $16 inBROS Ouuwru ST JOHN INDIANA 46373 avoid pitch-up seems pronounced Heliboy less Revolution 60 Rigid Rotor flybarless Helicopter flew few years back pitch-up charac teristic rigid rotor heads believe need bit nose weight well other comment regarding SX tail rotor assembly should made Because tail drive flex cable certain tighten set screws cable firmly would recommend Blue Loctite secure set screws since may loosen due give flex shaft have made two successful landings tail rotor its sure easier landing everything work ing As Helicopters checking nuts bolts will pay otT reliability Overall am impressed bit practice may enter upcoming contest now Im enjoying playing tag trees local flying site As Watson sensor apologize now must either re-install SX another machine give attention following instructions Remember size part rolls off workbench always inversely proportional depth shag rug See next month Dave Chesney Rt 9 Box 621A Greensboro NC 27409 FF Duration/Meuser Continued page 53 14 x22 Erv nobody checks limited rubber weight reduces flight time altitude both reducing chances hang-up wing-plus-tail area limit presents processing hassle perhaps simple maximum-chord limit something take care biplanes tandems would serve purpose well processing easier Erv has thought out pretty well plans build some models specs see works out thing seems certain rules will changed probably directions Erv has proposed simply matter time seems far better give serious attention Ervs proposal time comes well-considered rules become adopted rather some other countrys perhaps less-desirable rules last time said something like respect FAI Outdoor rules got accused everything senility consorting enemy hope dont have go around passing out told cards Editors note long letter En Rodemsky subject published January issue MAsee Competition News pp 95 96 also tells send comments RMcM NFFS lives keeps dying operating table getting revived seems During 1981 112 pages Free Flight NFFS Digest got sent printer about par good year although quite got published because slow start beginning year Most issues have pretty decent although have few glitches like getting Nats Unofficial Events announcements issue came out two weeks after Nats keepingthe list ofNFFS officers up-todate printing out-of-date membership fees Membership-plus-subscription fees increased late 1981 follows hope its right time US residents age 19 over non-US residents age 1 year $1500 2 years $2650 122 Model Aviation MAXI-ACRO TRAINER W SCALE ACRO TRAINER 60 SIZE ACRO TRAINER 40 SIZE SUPER HUNTER 60 SIZE DUCTED FAN F-106 DELTA DARTj 3 RIGHT HAND TRACTOR 3-FUNCTION ACCUETACH LCD Tachometer w dual scale capability lOX bOX @ Digital Voltmeter load /5 && checking/cycling TX/RX battery combosACcU-1ACMI torquick- harging operation 79 prepaid NorSend check money order C no C 0 D s alq~ Calif residents AVIONKSS add 6% t ax P0 Box 70956 Sunnyvale CA 94086 $ FORMULA 1 HIGH PERFORMANCE PROPELLERS D 1W AIRSCREW EACH PROPELLER HAND BALANCED Herd Eastern Maple4 Accurate airfoil pitch SssX6SR assX7IA ~eC Additional propellers available uoxe CUSTOM DESIGN UPON REQUEST DIRECT SALES ONLYeraa CostaR itaoaIoR 5R34 CRYSTAL COURT RSD FOR COD oAs SANTA ROSA S4RA CA RES ADO R% TAR CROiiE iTO7i 52RRRR4
Edition: Model Aviation - 1982/02
Page Numbers: 52, 53, 122
Fee Flight Duration Bob Meuser TRIPPER STRIPS Moe Whittemore writing CIA Informer thats Central Indiana Aeromodellers folks presents some interesting results tests tripper strips applied Indoor Hand-Launch Glider Trippers de scribed Bruce Carmichaels paper 1978 NFFS Symposium report recall Hank Cole using several decades ago Moes trippers look like trippers 35 percent chord width 012 015 high centers five strips located following dis tances leading edge expressed percentage chord 285 418 538 653 778 Moe made test glides glider trippers obtaining following results averaged over13 flights Without TrippersTrippers Sink rate ft/sec 119 109 Glide speed ft/sec 856 962 Glide slope1 70951 8595 Lift coefficient 0896 0789 nutshell trippers make glide faster flatter reduce sinking rate Moe says addition trippers increased launch altitude Vi higher glide speed B 1049 25095 4129 55142 7134 85102 95063 should result better penetration Out door model ability cope turbulence make rib template big deal made Terrific Comeback 1963 after quarter-century absence model aviation started Square areas Department Ribs tried cardboard scratch off list polysty rene sheet thats two plywoodmod-av style 1/32 1/16 barely OK model perhapsbut get chewed up razor blades easily material isnt easy work fairly expensive Brass OK hard can solder helps well Ckristian Sckwartzbadis Wakefield Prop C 30 45 61 71 72 57 33 DE 5804 5411 4526 3647 2665 2267 2760 come later Aluminum course Hard like 2024-T6 can get cant softer stuff makes Use sharp tin snips new-ish fine-tooth file cuts quickly accurately scribed line Soft aluminum clogs files oiling file lightly first helps standard file cleaner essential process case End Problem Ive actually known guys draw around template onto balsa sheet using ball-point pen manufacturing own printwood cut lines freehand razor X-Acto knife has dumbest way world cut ribs discard out-of-hand - the best possible reasons Im prejudiced Youre supposed Cut around template End Problem Two next problem prevent template o b% F FGdeg 095710 150567 193450 213355 210286 167235 101208 Non-slip rib templates Template itself metal Bob likes aluminum pins steel Bud Romak uses method left Bob the right Pick favorite slithering around sheet-wood cutting tried two-faced stickum tape stuck either too well too poorly either disaster Coarse sandpaper strips glued template does fair job far ideal Recently Bud Romak pulled out bunch templates illustrate some airfoil sections using template two three common pins pushed through holes drilled purpose epoxied place Someone remarked seemed like snazzy idea Bud retorted though everybody did way way turns out system latched onto after trying others following Terrific Comeback described first columns inAmerican ire raft Modeler about decade ago Buds system bit better tiny bit work bends pins first resulting lots glue area leave straight epoxy place snip off hojes left pins make easy stack ribs final sanding youre stinker uniformity End Problem Three Ervs again Messing around FAI Indoor model specs Hell really catch old diehards reigning World Indoor Champ Erv Rodemsky has come up 52 Model Aviation Larry Kruaes rgo moOeIIaCKIng urateenjoys inc uuious aissincsion OT naving won ruora Mats 4th place awards other model living dead L Kruse photo --- 2 ogies having left out chart values last month Props kaft winners past perhaps wed best pay attention Erv points Out rules simple FAI Indoor first became World Championship event nearly quarter-century ago Span limited 90cm 354 no minimum weight rule shipping such large models difficult few interested few World Champs cancelled Against strong US opposition span reduced present 65cm 276 limit ease trans portation problem Later minimum weight limit gram model rubber added ensure greater durability make easier participants countries ultra-light balsa simply available Participation increased Ten years development under rules however has seen changes trend has toward wide chords large overall lengths larger props greater weight rubber result models spend lot time banging rafters again quite fragile resulting models hanging up being destroyed longer length results same old shipping problems Erv points out recent teamselection Finals virtually world-class modeler blew least model Cezar Banks destroyed six Romak six Harlan three Cailliau three Erv thinks something should done make models rugged climb high make easier carry proposes following 1 maximum wing span 60 cm 236 2 maximum overall length excluding prop 60 cm 3 minimum weight excluding rubber 1 gram 4 projected area wings tail 1200 sq cm 186 sq 5 maximum motor weight 05 gram 6 geared motors mechanisms change prop pitch Bob really appreciates Windsor Propeller Co balsa stripper thoughts column angies flying surfaces flight prohibited points out could hand-carried aboard configuration changes must aeroelastic airliners limit least airline 9 x Such model would fit two-foot box Erv Continued page 122 - -r77\ I /I Q_ ffijz~j / HiiJIi Heres structure Wake-Up Wakefield-class model being kitted Champion Model Products 880 Carmen Court LaVerne CA91 750 Its first Wakefield kit US maybe quarter-century Price high its performance Read about column LiII February 1982 53 DOD Meuser lives ir .u .y received NFFS Modelof YearAwardforhis achievement ~mm. nw Bob knows secrets. Simplexs rubb-,orwinder isuiu,-iiu except standard hand-drill gears also uses ball thrust-bearing Assembled screws snap-rihgs can field-stripped very easily cleaning Jim Crocket sells drill/winder Bob has description column R/CIITMI- P7-F TIGERCAT Send 500 aiRIOg 216 499-5323 RC Kits Mfg UOH 44721 fiOzrfliddO PROPELLERS Made P0 yeste bo color Go GRISH No 1 propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 53each 545354Mc 6364Mc 747678Mc 848688c 949697 98104106Mc 114116118SI 124125126SuB 2 Blade Pusher 5/ 3 544 6364USc 86Mc 96106Si 3 Blade Tractor 53 6364 flOe 3 Blade Pusher 63Mc Metallic Aluminum Color Tractor 717651 8688S1Z 96 1061045130 P,sher06sim GRISH LARGE WOOD PROPELLERS HARDWOOD too hardr minimizes costly plane engine damage True pitch airfoil fully finished balanced ready coating 318 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 2O 8 27 10 24 13 NEWSIZE IN B&1OPITCH 26 $16 inBROS Ouuwru ST JOHN INDIANA 46373 avoid pitch-up seems pronounced Heliboy less Revolution 60 Rigid Rotor flybarless Helicopter flew few years back pitch-up charac teristic rigid rotor heads believe need bit nose weight well other comment regarding SX tail rotor assembly should made Because tail drive flex cable certain tighten set screws cable firmly would recommend Blue Loctite secure set screws since may loosen due give flex shaft have made two successful landings tail rotor its sure easier landing everything work ing As Helicopters checking nuts bolts will pay otT reliability Overall am impressed bit practice may enter upcoming contest now Im enjoying playing tag trees local flying site As Watson sensor apologize now must either re-install SX another machine give attention following instructions Remember size part rolls off workbench always inversely proportional depth shag rug See next month Dave Chesney Rt 9 Box 621A Greensboro NC 27409 FF Duration/Meuser Continued page 53 14 x22 Erv nobody checks limited rubber weight reduces flight time altitude both reducing chances hang-up wing-plus-tail area limit presents processing hassle perhaps simple maximum-chord limit something take care biplanes tandems would serve purpose well processing easier Erv has thought out pretty well plans build some models specs see works out thing seems certain rules will changed probably directions Erv has proposed simply matter time seems far better give serious attention Ervs proposal time comes well-considered rules become adopted rather some other countrys perhaps less-desirable rules last time said something like respect FAI Outdoor rules got accused everything senility consorting enemy hope dont have go around passing out told cards Editors note long letter En Rodemsky subject published January issue MAsee Competition News pp 95 96 also tells send comments RMcM NFFS lives keeps dying operating table getting revived seems During 1981 112 pages Free Flight NFFS Digest got sent printer about par good year although quite got published because slow start beginning year Most issues have pretty decent although have few glitches like getting Nats Unofficial Events announcements issue came out two weeks after Nats keepingthe list ofNFFS officers up-todate printing out-of-date membership fees Membership-plus-subscription fees increased late 1981 follows hope its right time US residents age 19 over non-US residents age 1 year $1500 2 years $2650 122 Model Aviation MAXI-ACRO TRAINER W SCALE ACRO TRAINER 60 SIZE ACRO TRAINER 40 SIZE SUPER HUNTER 60 SIZE DUCTED FAN F-106 DELTA DARTj 3 RIGHT HAND TRACTOR 3-FUNCTION ACCUETACH LCD Tachometer w dual scale capability lOX bOX @ Digital Voltmeter load /5 && checking/cycling TX/RX battery combosACcU-1ACMI torquick- harging operation 79 prepaid NorSend check money order C no C 0 D s alq~ Calif residents AVIONKSS add 6% t ax P0 Box 70956 Sunnyvale CA 94086 $ FORMULA 1 HIGH PERFORMANCE PROPELLERS D 1W AIRSCREW EACH PROPELLER HAND BALANCED Herd Eastern Maple4 Accurate airfoil pitch SssX6SR assX7IA ~eC Additional propellers available uoxe CUSTOM DESIGN UPON REQUEST DIRECT SALES ONLYeraa CostaR itaoaIoR 5R34 CRYSTAL COURT RSD FOR COD oAs SANTA ROSA S4RA CA RES ADO R% TAR CROiiE iTO7i 52RRRR4
Edition: Model Aviation - 1982/02
Page Numbers: 52, 53, 122
Fee Flight Duration Bob Meuser TRIPPER STRIPS Moe Whittemore writing CIA Informer thats Central Indiana Aeromodellers folks presents some interesting results tests tripper strips applied Indoor Hand-Launch Glider Trippers de scribed Bruce Carmichaels paper 1978 NFFS Symposium report recall Hank Cole using several decades ago Moes trippers look like trippers 35 percent chord width 012 015 high centers five strips located following dis tances leading edge expressed percentage chord 285 418 538 653 778 Moe made test glides glider trippers obtaining following results averaged over13 flights Without TrippersTrippers Sink rate ft/sec 119 109 Glide speed ft/sec 856 962 Glide slope1 70951 8595 Lift coefficient 0896 0789 nutshell trippers make glide faster flatter reduce sinking rate Moe says addition trippers increased launch altitude Vi higher glide speed B 1049 25095 4129 55142 7134 85102 95063 should result better penetration Out door model ability cope turbulence make rib template big deal made Terrific Comeback 1963 after quarter-century absence model aviation started Square areas Department Ribs tried cardboard scratch off list polysty rene sheet thats two plywoodmod-av style 1/32 1/16 barely OK model perhapsbut get chewed up razor blades easily material isnt easy work fairly expensive Brass OK hard can solder helps well Ckristian Sckwartzbadis Wakefield Prop C 30 45 61 71 72 57 33 DE 5804 5411 4526 3647 2665 2267 2760 come later Aluminum course Hard like 2024-T6 can get cant softer stuff makes Use sharp tin snips new-ish fine-tooth file cuts quickly accurately scribed line Soft aluminum clogs files oiling file lightly first helps standard file cleaner essential process case End Problem Ive actually known guys draw around template onto balsa sheet using ball-point pen manufacturing own printwood cut lines freehand razor X-Acto knife has dumbest way world cut ribs discard out-of-hand - the best possible reasons Im prejudiced Youre supposed Cut around template End Problem Two next problem prevent template o b% F FGdeg 095710 150567 193450 213355 210286 167235 101208 Non-slip rib templates Template itself metal Bob likes aluminum pins steel Bud Romak uses method left Bob the right Pick favorite slithering around sheet-wood cutting tried two-faced stickum tape stuck either too well too poorly either disaster Coarse sandpaper strips glued template does fair job far ideal Recently Bud Romak pulled out bunch templates illustrate some airfoil sections using template two three common pins pushed through holes drilled purpose epoxied place Someone remarked seemed like snazzy idea Bud retorted though everybody did way way turns out system latched onto after trying others following Terrific Comeback described first columns inAmerican ire raft Modeler about decade ago Buds system bit better tiny bit work bends pins first resulting lots glue area leave straight epoxy place snip off hojes left pins make easy stack ribs final sanding youre stinker uniformity End Problem Three Ervs again Messing around FAI Indoor model specs Hell really catch old diehards reigning World Indoor Champ Erv Rodemsky has come up 52 Model Aviation Larry Kruaes rgo moOeIIaCKIng urateenjoys inc uuious aissincsion OT naving won ruora Mats 4th place awards other model living dead L Kruse photo --- 2 ogies having left out chart values last month Props kaft winners past perhaps wed best pay attention Erv points Out rules simple FAI Indoor first became World Championship event nearly quarter-century ago Span limited 90cm 354 no minimum weight rule shipping such large models difficult few interested few World Champs cancelled Against strong US opposition span reduced present 65cm 276 limit ease trans portation problem Later minimum weight limit gram model rubber added ensure greater durability make easier participants countries ultra-light balsa simply available Participation increased Ten years development under rules however has seen changes trend has toward wide chords large overall lengths larger props greater weight rubber result models spend lot time banging rafters again quite fragile resulting models hanging up being destroyed longer length results same old shipping problems Erv points out recent teamselection Finals virtually world-class modeler blew least model Cezar Banks destroyed six Romak six Harlan three Cailliau three Erv thinks something should done make models rugged climb high make easier carry proposes following 1 maximum wing span 60 cm 236 2 maximum overall length excluding prop 60 cm 3 minimum weight excluding rubber 1 gram 4 projected area wings tail 1200 sq cm 186 sq 5 maximum motor weight 05 gram 6 geared motors mechanisms change prop pitch Bob really appreciates Windsor Propeller Co balsa stripper thoughts column angies flying surfaces flight prohibited points out could hand-carried aboard configuration changes must aeroelastic airliners limit least airline 9 x Such model would fit two-foot box Erv Continued page 122 - -r77\ I /I Q_ ffijz~j / HiiJIi Heres structure Wake-Up Wakefield-class model being kitted Champion Model Products 880 Carmen Court LaVerne CA91 750 Its first Wakefield kit US maybe quarter-century Price high its performance Read about column LiII February 1982 53 DOD Meuser lives ir .u .y received NFFS Modelof YearAwardforhis achievement ~mm. nw Bob knows secrets. Simplexs rubb-,orwinder isuiu,-iiu except standard hand-drill gears also uses ball thrust-bearing Assembled screws snap-rihgs can field-stripped very easily cleaning Jim Crocket sells drill/winder Bob has description column R/CIITMI- P7-F TIGERCAT Send 500 aiRIOg 216 499-5323 RC Kits Mfg UOH 44721 fiOzrfliddO PROPELLERS Made P0 yeste bo color Go GRISH No 1 propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 53each 545354Mc 6364Mc 747678Mc 848688c 949697 98104106Mc 114116118SI 124125126SuB 2 Blade Pusher 5/ 3 544 6364USc 86Mc 96106Si 3 Blade Tractor 53 6364 flOe 3 Blade Pusher 63Mc Metallic Aluminum Color Tractor 717651 8688S1Z 96 1061045130 P,sher06sim GRISH LARGE WOOD PROPELLERS HARDWOOD too hardr minimizes costly plane engine damage True pitch airfoil fully finished balanced ready coating 318 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 2O 8 27 10 24 13 NEWSIZE IN B&1OPITCH 26 $16 inBROS Ouuwru ST JOHN INDIANA 46373 avoid pitch-up seems pronounced Heliboy less Revolution 60 Rigid Rotor flybarless Helicopter flew few years back pitch-up charac teristic rigid rotor heads believe need bit nose weight well other comment regarding SX tail rotor assembly should made Because tail drive flex cable certain tighten set screws cable firmly would recommend Blue Loctite secure set screws since may loosen due give flex shaft have made two successful landings tail rotor its sure easier landing everything work ing As Helicopters checking nuts bolts will pay otT reliability Overall am impressed bit practice may enter upcoming contest now Im enjoying playing tag trees local flying site As Watson sensor apologize now must either re-install SX another machine give attention following instructions Remember size part rolls off workbench always inversely proportional depth shag rug See next month Dave Chesney Rt 9 Box 621A Greensboro NC 27409 FF Duration/Meuser Continued page 53 14 x22 Erv nobody checks limited rubber weight reduces flight time altitude both reducing chances hang-up wing-plus-tail area limit presents processing hassle perhaps simple maximum-chord limit something take care biplanes tandems would serve purpose well processing easier Erv has thought out pretty well plans build some models specs see works out thing seems certain rules will changed probably directions Erv has proposed simply matter time seems far better give serious attention Ervs proposal time comes well-considered rules become adopted rather some other countrys perhaps less-desirable rules last time said something like respect FAI Outdoor rules got accused everything senility consorting enemy hope dont have go around passing out told cards Editors note long letter En Rodemsky subject published January issue MAsee Competition News pp 95 96 also tells send comments RMcM NFFS lives keeps dying operating table getting revived seems During 1981 112 pages Free Flight NFFS Digest got sent printer about par good year although quite got published because slow start beginning year Most issues have pretty decent although have few glitches like getting Nats Unofficial Events announcements issue came out two weeks after Nats keepingthe list ofNFFS officers up-todate printing out-of-date membership fees Membership-plus-subscription fees increased late 1981 follows hope its right time US residents age 19 over non-US residents age 1 year $1500 2 years $2650 122 Model Aviation MAXI-ACRO TRAINER W SCALE ACRO TRAINER 60 SIZE ACRO TRAINER 40 SIZE SUPER HUNTER 60 SIZE DUCTED FAN F-106 DELTA DARTj 3 RIGHT HAND TRACTOR 3-FUNCTION ACCUETACH LCD Tachometer w dual scale capability lOX bOX @ Digital Voltmeter load /5 && checking/cycling TX/RX battery combosACcU-1ACMI torquick- harging operation 79 prepaid NorSend check money order C no C 0 D s alq~ Calif residents AVIONKSS add 6% t ax P0 Box 70956 Sunnyvale CA 94086 $ FORMULA 1 HIGH PERFORMANCE PROPELLERS D 1W AIRSCREW EACH PROPELLER HAND BALANCED Herd Eastern Maple4 Accurate airfoil pitch SssX6SR assX7IA ~eC Additional propellers available uoxe CUSTOM DESIGN UPON REQUEST DIRECT SALES ONLYeraa CostaR itaoaIoR 5R34 CRYSTAL COURT RSD FOR COD oAs SANTA ROSA S4RA CA RES ADO R% TAR CROiiE iTO7i 52RRRR4