Duralion Meuser WINGLETS IN YOUR FUTURE Winglets small nearly vertical winglike surfaces mounted tips wing Recent NASA tests have shown propT#pica/ q,9Iet section Wing/ct i dug Upper-4 Loive root -7 Lo*wr 4 -ii 38 erly designed winglets reduced induced drag about 20% increased wing lift-drag ratio about 9% aircraft tested 14IcK C 65C ZC 5Zl /50 surface -F--- 4 geipw surface tip plates employed Garamis Strato Streak decades ago well known fact such tip plates patented Lancaster 1897 Arent winglets same thing long shot Tip plates characteristically low-aspect-ratio surfaces set parallel aircraft center line inhibit spillage air bottom wing fuzz up tip vortices reduce induced drag own frictional drag usually compen sates decrease induced drag difference between tip plates winglets innovative contribution NASAs Richard Whitcomb state art winglets efficient high-aspectratio surfaces carefully designed placed set angle incidence con trived produce best result cam bered proper airfoil section doubt winglets will have much im pact free-flight model aviation competition classes say winglets will appear World Champs-winning FAI Power model days often features survive indeed become fashionablenot cause superiority merely lack clear-cut inferiority span-limited eventsPayload Cargo FAI-Indoor Pennyplane Novice Pennyplanewinglets might indeed prove useful other events simplest way reduce induced drag increase span Further remember winglets lifting surfaces set incidence angle class climb near ly vertical speed under power much greater glide speed induced dragdrag resulting lift during climbis negligible anyhow winglets under such conditions can add drag understand winglets work re duce induced drag must first under stand what induced drag about .-"textbooks dont help much often fail distinguish between physical phe nomena mathematically convenient artifices best difficult subject So fasten seatbelts hang dear life go wing produces lift pressure / lower surface exceeds upper surface high-pressure air under wing tends move outward around N.the tips low-pressure region above wing results wing-tip vortices shown sketches Notice airflow downward region between vortices precisely wing happens vortices induce generally downward flow over wing drag effect produces -called induced drag effect wing flying through downward-sloping airflow field fly ing uphill lift forcethe force per pendicular airflowslopes back wards has component parallel flight path drag component drag resulting lift termed induced drag NASA winglets may cure-all free-flight models have spectacular success Varieze pg 20 Feb 1976 MA cruises 30% power62-hp Volkswagen engineat 135 mph 186 75% carries two people 1000 miles 70 miles per gallon 1 K~// / 1 / / / $1 /7% 2eor /\ \/\ \ j I N Fop vew What noteworthy about Whitcomb wingletshe man devised coke bottle fuselage vital breaking through so-called sound barrieris very great reduction induced drag diagram representation induced air flow about normal wing 2 42 Model Aviation Anything makes tip vortex less intensesuch increasing spanor spreads out diffusing over larger volume air tends decrease duced drag biplane has less induced drag monoplane having same span lift example because splits tip vortex half flow above wing inward winglet arranged above wing tip such way push air outward has desired effect Now comes neat trick upper winglets actually toed out washed out might think would push air wrong direc tion winglet flying flow field canted inward greater angle angle incidence winglet So winglet still produces lift further since lift directed per pendicular local air flow winglet lift contributes thrust component Pretty snazzy eh appears proper design winglets pretty tricky affair cant expect glue set old Sweepette wings tips ten-year-old Starduster 600 arbitrary angle achieve desired result Thats obvious darn might worth try NASAs results summarized following report NASA TN D-8260 Design Approach Selected WindTunnel Results High Subsonic Speeds Wing-Tip Mounted Winglets Richard T Whitcomb Langley Research Center report sale public National Technical Information Service Springfield Virginia 22161 $375 Id like thank Hewitt Phillips NASA explaining sure hope got straight National Free Flight Society 1977 Model Year Awards International Classes FAI Wakefield Nordic A-2 Engine Power Coupe DHiver Walt Ghio Bob Isaacson Larry Conover Georges Matherat France Flux Wishbone Lucky Lindy Les Trumeaux AMA Power Small l/2A Large B C Indoor Stick FAI Stick Jim Clem Jim Clem Bob Hanford Indoor Rubber Power Dick Kowalski Bud Romak Rubber-powered Speed A-i Nordic Special Class Jim Lewis Mike Fedor Okie Bird Scrambler Super Star Grand Gram Quail Lil Hooker selection committee included Ed Carroll FAI Tony Italiano AMA Gas Jim Richmond Indoor Charlie Sotich Special Clarence Mather Chairman eighth consecutive year Model Year awards Drawings photos articles about models will appear National Free Flight Society Symposium Report will available Nats mail order NFFS Customarily awardees display describe models NFFS Symposium held Nats Kowalskis model described December 1976 issue column Romaks February 1977 issue Jim Lewis Quail appeared May 1976 issue Clems Scrambler 1976 issue August1977 43 Continued page 87 Jones Balsa Stripper cutting sheet stock strips now equipped both inch metric scales scales can retrofitted earlier model handy stripper Bob finds hot-melt glue gun great tool have handy zapping dihedral jigs such Glue slugs lower left Georgias Harry Grogan Class C Witch Doctor 800 snapped Dave Linstrum recent KOI Popular model Sig kit Note extra bracing Covering Monokote two readers sent lengthy reports eight pages long said bum blebee cannot fly Anyway incredible may seem record stands what worth Austrian representa tive World Championship South Africa Karl Wasner witness flight Although acting official gave lengthy description scribe record-breaking flight attempts before electronic timers used runs respect spent time much effort offering criticism may reminded column does serve sounding board ideas opinions However in-depth study records dispute same should directed AMA HQ US aeromodeling representa tive FAI transmissionwhich did case Sitar record Dan Pruss Rt 2 Box 490 Plainfield IL 60544 FF Duration/Meuser continued page 43 Ruff Stuff Thats trade name some rather special sandpaper put out Ap plied Design Corporation marketed through Sig Basically plain old Nor ton Garnet Finishing Paper Whats special about backing back coating no-lickum stickumself adhesive coating preferprotected peel-off paper covering Cut oversize peel off peel-off backing stick object choice trim edges object choice might dowel proper size fillets favorite scale model gently arched stick putting undercamber Wake field prop flat surface large enough accept full-size sheet latter will handier might think example sanding down indoor glider wing sandpaper-coated surface pre vents wing slipping around sanding second sand paper-covered sheet balsa too will come handy truing up end rib wing panel just prior making dihedral joint modeling applica tions better have sandpaper nailed down move model part back forth over usual method holding part sloshing sandpaper back forth Try see sheets standard 9 X 1 size Sigs price package 36 sheets12 medium bOA 12 fine 180A 12 super-fine 280Ais $14 about 30% would pay plain garnet paper Perhaps dealer will sell sheet ask him nicely Jones Balsa Stripper Revisited last Julys issue mentioned nifty balsa stripper available Jim Jones $1080 postpaid 36631 Ledgestone Mt Clem pcfm Industries Inc 7060 HOLLYWOOD BLVD LOS ANGELES CA 90028 ens MI 48043 newer ones cali brated increments 005 inches 01 mm Thats right both inch metric calibrations provided already have earlier non-calibrated models Jim will send stick-on scale return stamped selfaddressed envelope have difficulty finding double-edge razor blades will snap properly provide sharp cutting point send another $5 Jim hundred postpaid can shave like Jim says doesnt mind Glue Gun Home craftsmen come two varieties true craftsman does better job professionals al though takes him three times long b tool freak owns tool known man doesnt know use wouldnt have anything use did know Im too humble classify myself seem have quite collection goofy tools come two varieties couldnt see could live owning never used after bought b thought would never have use bought anyhow now use almost daily seven-dollar hot-melt glue gun latter Mine Thermogrip manufactured USM Corporation August1977 87 iH CAYmAf/m/ TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Aura I 50191 HOT FUEL PROOF DOPE EXCLUSIVE LOWHEAT AWARD WINNINGCOVERING FOR GlUMFilm HIGLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel proof lightweight MORE wiMriO 0$ safle power YELLOW G0 ~ee e6 ELL G~ 9e~e cp$e edoo 405e do. O150 S S 854 8-6 68 96 106 104550 MetallicMi. er 5550 IflY ACE 17/ SPAN STOCK NO PP 15 KIT $425 0 WILNT SCALE ASK FOR OUR KITS AND ACCESSORIES AT YOUR LOCAL DIALER IF NOT AVAILARLE AT TOUR DEALER ORDER DIRECT ADD AGE POSTAGE BlOWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CNAEGEE AND 5 SIZES OF TANKS EROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS YMRRE B adr T acto 5354e h a-25354304 Bade6364354 Pusher747678504 SIeach848888654 53 5W4949-69798 6364 10-4106854 8-685411-4 116 1181 96506l RC 124 3 BIaEIR TracSr125 126 E 5 5354 6-364 504 ORISH 3BIade PusherBROS 6-3 504 57 JOHN INDIANA 46373 WALNUT SCALE KITS RARY ACE .. $425 PEANUT SCALE KITS PIPER J3 CUR$329 PIETENPOS$329 MILES 9 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR.. $349 ANDREASON$349 GIPSY MOTN $349 GANAGOBIE$349 SPORT MODEL KITS ONE NITE 2H$475 ONE NITE 18$349 STONGLESS WONDER$249 PECK ROG$139 KITS 0 PLANS 0 ACCESEORIRE REAL JAPANESE TISSUE-PROPS COMPLETE CATALOG 504 MANY HARD TO FIND ITEMS PO BOX 24W -AMALA MESA CAUF 92041 iwwgyIeersPHONE 17141 4694675 1 442-4636 Several brands available work about same Plug cord wall wait two minutes grasp gun pistol grip push cylinder glue head application little pressure thumb glue squirts out nozzle glue simply thermo-plas tic material cools hardens allows about 15 seconds position parts gluing press together about minute have bond strong wood itself can also used join metal leather rub ber plastics rigid foam materials could probably build whole airplane using would weigh ton have used mostly zapping gether dihedral jigs jig drilling holes proper angle blade folding prop partition across model box goodie hold wing fuselage scale model glued struts place such imagine Ill find use models themselvesperhaps securing firewall place think could used things pres ently use epoxy much fuss mess having wait interminable five minutes Try avoid getting hot glue fingers smarts Heat-Shrink Tubing plastic tub ing available electronics supply sources Upon application heat shrinks less half its original di ameter wall thickens same pro portion length remains same smallest size have seen starts out life l/16 id 00035e wall heated shrinks id bit under O020e making nice sliding fit over 15-mil wire makes neat hub reinforce ments wheels used light indoor models Shrunk over prop shaft rear hook Pennyplane similar model made 20-mil larger wire helps prevent thin wire cutting rubber adds negligible weight Want piece tubing having precise inside diameter substitute miserable rolled-tissue tubes used door models some part scale model Shrink tubing over piece music wire shank twist drill thin wall start smallest size tubing will just fit over mandrel thicker wall use larger tubing still thicker wall shrink several pieces over other tubing available wide variety colors diameters wall thicknesses hardnesses electronics hobby stores Bob Meuser 4200 Gregory St Oak land CA 94619 FF Indoor/Tenny continued page 44 indoors Almost nothing happened long time Eds first model built heavy purpose over 7 oz man aged 3408 blimp hangar Lake hurst really wasnt indoor model wasnt what Ed after small groups around country tried Miami Indoor Aircraft Model Assoc MIAMA based Miami Florida course began regular sessions ex perience led rules Airframe weight Less rubber4 grams minimum Overall length Measured front prop bearing aft20e maximum Fuselage Must support enclose single rubber motor no motor sticks b Must include exceed box 2/2 X 4 X 2 no diamond shapes c Must have windshield 2 sq minimum area window side sq minimum area covered cellophane similar material Prop Solid wood direct drive fixed pitch Wing Unbraced monoplane 4 maximum chord 20 projected span Landing gear Rigid fixed least two wheels 1 minimum diameter Flying flights ROG unlimited tempts record 5 flights Flights less 20 seconds attempts Best flight counts Covering Except windshield windowspaper covering No film microlite Using above rules MIAMA sponsored two major contests 1976 will repeat 1977 NIMAS Inter national Record Trials held Atrium Northwood Institute five contestants flew Manhattan Formula models Bucky Servaites winning 4528 Nats Dan Domina proxy-flew John Triolos Manhattan winning time 8097 two meets break ice terest began grow considerable cor respondence has exchanged regarding future event possible new rules meantime same rules will used 1977 predictions being made about some Manhattan For88 Model Aviation FL Wit RUDDER UR KITS S SSORIES MR MODELER manufacture special ized accessories make R/C modeling easier never out stock items manufacture Seeyour deal er send first class stamp catalog sheets listing over 70 items complete pictures prices OVER 12 YEARS SERVICE
Edition: Model Aviation - 1977/08
Page Numbers: 42, 43, 87, 88
Edition: Model Aviation - 1977/08
Page Numbers: 42, 43, 87, 88
Duralion Meuser WINGLETS IN YOUR FUTURE Winglets small nearly vertical winglike surfaces mounted tips wing Recent NASA tests have shown propT#pica/ q,9Iet section Wing/ct i dug Upper-4 Loive root -7 Lo*wr 4 -ii 38 erly designed winglets reduced induced drag about 20% increased wing lift-drag ratio about 9% aircraft tested 14IcK C 65C ZC 5Zl /50 surface -F--- 4 geipw surface tip plates employed Garamis Strato Streak decades ago well known fact such tip plates patented Lancaster 1897 Arent winglets same thing long shot Tip plates characteristically low-aspect-ratio surfaces set parallel aircraft center line inhibit spillage air bottom wing fuzz up tip vortices reduce induced drag own frictional drag usually compen sates decrease induced drag difference between tip plates winglets innovative contribution NASAs Richard Whitcomb state art winglets efficient high-aspectratio surfaces carefully designed placed set angle incidence con trived produce best result cam bered proper airfoil section doubt winglets will have much im pact free-flight model aviation competition classes say winglets will appear World Champs-winning FAI Power model days often features survive indeed become fashionablenot cause superiority merely lack clear-cut inferiority span-limited eventsPayload Cargo FAI-Indoor Pennyplane Novice Pennyplanewinglets might indeed prove useful other events simplest way reduce induced drag increase span Further remember winglets lifting surfaces set incidence angle class climb near ly vertical speed under power much greater glide speed induced dragdrag resulting lift during climbis negligible anyhow winglets under such conditions can add drag understand winglets work re duce induced drag must first under stand what induced drag about .-"textbooks dont help much often fail distinguish between physical phe nomena mathematically convenient artifices best difficult subject So fasten seatbelts hang dear life go wing produces lift pressure / lower surface exceeds upper surface high-pressure air under wing tends move outward around N.the tips low-pressure region above wing results wing-tip vortices shown sketches Notice airflow downward region between vortices precisely wing happens vortices induce generally downward flow over wing drag effect produces -called induced drag effect wing flying through downward-sloping airflow field fly ing uphill lift forcethe force per pendicular airflowslopes back wards has component parallel flight path drag component drag resulting lift termed induced drag NASA winglets may cure-all free-flight models have spectacular success Varieze pg 20 Feb 1976 MA cruises 30% power62-hp Volkswagen engineat 135 mph 186 75% carries two people 1000 miles 70 miles per gallon 1 K~// / 1 / / / $1 /7% 2eor /\ \/\ \ j I N Fop vew What noteworthy about Whitcomb wingletshe man devised coke bottle fuselage vital breaking through so-called sound barrieris very great reduction induced drag diagram representation induced air flow about normal wing 2 42 Model Aviation Anything makes tip vortex less intensesuch increasing spanor spreads out diffusing over larger volume air tends decrease duced drag biplane has less induced drag monoplane having same span lift example because splits tip vortex half flow above wing inward winglet arranged above wing tip such way push air outward has desired effect Now comes neat trick upper winglets actually toed out washed out might think would push air wrong direc tion winglet flying flow field canted inward greater angle angle incidence winglet So winglet still produces lift further since lift directed per pendicular local air flow winglet lift contributes thrust component Pretty snazzy eh appears proper design winglets pretty tricky affair cant expect glue set old Sweepette wings tips ten-year-old Starduster 600 arbitrary angle achieve desired result Thats obvious darn might worth try NASAs results summarized following report NASA TN D-8260 Design Approach Selected WindTunnel Results High Subsonic Speeds Wing-Tip Mounted Winglets Richard T Whitcomb Langley Research Center report sale public National Technical Information Service Springfield Virginia 22161 $375 Id like thank Hewitt Phillips NASA explaining sure hope got straight National Free Flight Society 1977 Model Year Awards International Classes FAI Wakefield Nordic A-2 Engine Power Coupe DHiver Walt Ghio Bob Isaacson Larry Conover Georges Matherat France Flux Wishbone Lucky Lindy Les Trumeaux AMA Power Small l/2A Large B C Indoor Stick FAI Stick Jim Clem Jim Clem Bob Hanford Indoor Rubber Power Dick Kowalski Bud Romak Rubber-powered Speed A-i Nordic Special Class Jim Lewis Mike Fedor Okie Bird Scrambler Super Star Grand Gram Quail Lil Hooker selection committee included Ed Carroll FAI Tony Italiano AMA Gas Jim Richmond Indoor Charlie Sotich Special Clarence Mather Chairman eighth consecutive year Model Year awards Drawings photos articles about models will appear National Free Flight Society Symposium Report will available Nats mail order NFFS Customarily awardees display describe models NFFS Symposium held Nats Kowalskis model described December 1976 issue column Romaks February 1977 issue Jim Lewis Quail appeared May 1976 issue Clems Scrambler 1976 issue August1977 43 Continued page 87 Jones Balsa Stripper cutting sheet stock strips now equipped both inch metric scales scales can retrofitted earlier model handy stripper Bob finds hot-melt glue gun great tool have handy zapping dihedral jigs such Glue slugs lower left Georgias Harry Grogan Class C Witch Doctor 800 snapped Dave Linstrum recent KOI Popular model Sig kit Note extra bracing Covering Monokote two readers sent lengthy reports eight pages long said bum blebee cannot fly Anyway incredible may seem record stands what worth Austrian representa tive World Championship South Africa Karl Wasner witness flight Although acting official gave lengthy description scribe record-breaking flight attempts before electronic timers used runs respect spent time much effort offering criticism may reminded column does serve sounding board ideas opinions However in-depth study records dispute same should directed AMA HQ US aeromodeling representa tive FAI transmissionwhich did case Sitar record Dan Pruss Rt 2 Box 490 Plainfield IL 60544 FF Duration/Meuser continued page 43 Ruff Stuff Thats trade name some rather special sandpaper put out Ap plied Design Corporation marketed through Sig Basically plain old Nor ton Garnet Finishing Paper Whats special about backing back coating no-lickum stickumself adhesive coating preferprotected peel-off paper covering Cut oversize peel off peel-off backing stick object choice trim edges object choice might dowel proper size fillets favorite scale model gently arched stick putting undercamber Wake field prop flat surface large enough accept full-size sheet latter will handier might think example sanding down indoor glider wing sandpaper-coated surface pre vents wing slipping around sanding second sand paper-covered sheet balsa too will come handy truing up end rib wing panel just prior making dihedral joint modeling applica tions better have sandpaper nailed down move model part back forth over usual method holding part sloshing sandpaper back forth Try see sheets standard 9 X 1 size Sigs price package 36 sheets12 medium bOA 12 fine 180A 12 super-fine 280Ais $14 about 30% would pay plain garnet paper Perhaps dealer will sell sheet ask him nicely Jones Balsa Stripper Revisited last Julys issue mentioned nifty balsa stripper available Jim Jones $1080 postpaid 36631 Ledgestone Mt Clem pcfm Industries Inc 7060 HOLLYWOOD BLVD LOS ANGELES CA 90028 ens MI 48043 newer ones cali brated increments 005 inches 01 mm Thats right both inch metric calibrations provided already have earlier non-calibrated models Jim will send stick-on scale return stamped selfaddressed envelope have difficulty finding double-edge razor blades will snap properly provide sharp cutting point send another $5 Jim hundred postpaid can shave like Jim says doesnt mind Glue Gun Home craftsmen come two varieties true craftsman does better job professionals al though takes him three times long b tool freak owns tool known man doesnt know use wouldnt have anything use did know Im too humble classify myself seem have quite collection goofy tools come two varieties couldnt see could live owning never used after bought b thought would never have use bought anyhow now use almost daily seven-dollar hot-melt glue gun latter Mine Thermogrip manufactured USM Corporation August1977 87 iH CAYmAf/m/ TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Aura I 50191 HOT FUEL PROOF DOPE EXCLUSIVE LOWHEAT AWARD WINNINGCOVERING FOR GlUMFilm HIGLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel proof lightweight MORE wiMriO 0$ safle power YELLOW G0 ~ee e6 ELL G~ 9e~e cp$e edoo 405e do. O150 S S 854 8-6 68 96 106 104550 MetallicMi. er 5550 IflY ACE 17/ SPAN STOCK NO PP 15 KIT $425 0 WILNT SCALE ASK FOR OUR KITS AND ACCESSORIES AT YOUR LOCAL DIALER IF NOT AVAILARLE AT TOUR DEALER ORDER DIRECT ADD AGE POSTAGE BlOWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CNAEGEE AND 5 SIZES OF TANKS EROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS YMRRE B adr T acto 5354e h a-25354304 Bade6364354 Pusher747678504 SIeach848888654 53 5W4949-69798 6364 10-4106854 8-685411-4 116 1181 96506l RC 124 3 BIaEIR TracSr125 126 E 5 5354 6-364 504 ORISH 3BIade PusherBROS 6-3 504 57 JOHN INDIANA 46373 WALNUT SCALE KITS RARY ACE .. $425 PEANUT SCALE KITS PIPER J3 CUR$329 PIETENPOS$329 MILES 9 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR.. $349 ANDREASON$349 GIPSY MOTN $349 GANAGOBIE$349 SPORT MODEL KITS ONE NITE 2H$475 ONE NITE 18$349 STONGLESS WONDER$249 PECK ROG$139 KITS 0 PLANS 0 ACCESEORIRE REAL JAPANESE TISSUE-PROPS COMPLETE CATALOG 504 MANY HARD TO FIND ITEMS PO BOX 24W -AMALA MESA CAUF 92041 iwwgyIeersPHONE 17141 4694675 1 442-4636 Several brands available work about same Plug cord wall wait two minutes grasp gun pistol grip push cylinder glue head application little pressure thumb glue squirts out nozzle glue simply thermo-plas tic material cools hardens allows about 15 seconds position parts gluing press together about minute have bond strong wood itself can also used join metal leather rub ber plastics rigid foam materials could probably build whole airplane using would weigh ton have used mostly zapping gether dihedral jigs jig drilling holes proper angle blade folding prop partition across model box goodie hold wing fuselage scale model glued struts place such imagine Ill find use models themselvesperhaps securing firewall place think could used things pres ently use epoxy much fuss mess having wait interminable five minutes Try avoid getting hot glue fingers smarts Heat-Shrink Tubing plastic tub ing available electronics supply sources Upon application heat shrinks less half its original di ameter wall thickens same pro portion length remains same smallest size have seen starts out life l/16 id 00035e wall heated shrinks id bit under O020e making nice sliding fit over 15-mil wire makes neat hub reinforce ments wheels used light indoor models Shrunk over prop shaft rear hook Pennyplane similar model made 20-mil larger wire helps prevent thin wire cutting rubber adds negligible weight Want piece tubing having precise inside diameter substitute miserable rolled-tissue tubes used door models some part scale model Shrink tubing over piece music wire shank twist drill thin wall start smallest size tubing will just fit over mandrel thicker wall use larger tubing still thicker wall shrink several pieces over other tubing available wide variety colors diameters wall thicknesses hardnesses electronics hobby stores Bob Meuser 4200 Gregory St Oak land CA 94619 FF Indoor/Tenny continued page 44 indoors Almost nothing happened long time Eds first model built heavy purpose over 7 oz man aged 3408 blimp hangar Lake hurst really wasnt indoor model wasnt what Ed after small groups around country tried Miami Indoor Aircraft Model Assoc MIAMA based Miami Florida course began regular sessions ex perience led rules Airframe weight Less rubber4 grams minimum Overall length Measured front prop bearing aft20e maximum Fuselage Must support enclose single rubber motor no motor sticks b Must include exceed box 2/2 X 4 X 2 no diamond shapes c Must have windshield 2 sq minimum area window side sq minimum area covered cellophane similar material Prop Solid wood direct drive fixed pitch Wing Unbraced monoplane 4 maximum chord 20 projected span Landing gear Rigid fixed least two wheels 1 minimum diameter Flying flights ROG unlimited tempts record 5 flights Flights less 20 seconds attempts Best flight counts Covering Except windshield windowspaper covering No film microlite Using above rules MIAMA sponsored two major contests 1976 will repeat 1977 NIMAS Inter national Record Trials held Atrium Northwood Institute five contestants flew Manhattan Formula models Bucky Servaites winning 4528 Nats Dan Domina proxy-flew John Triolos Manhattan winning time 8097 two meets break ice terest began grow considerable cor respondence has exchanged regarding future event possible new rules meantime same rules will used 1977 predictions being made about some Manhattan For88 Model Aviation FL Wit RUDDER UR KITS S SSORIES MR MODELER manufacture special ized accessories make R/C modeling easier never out stock items manufacture Seeyour deal er send first class stamp catalog sheets listing over 70 items complete pictures prices OVER 12 YEARS SERVICE
Edition: Model Aviation - 1977/08
Page Numbers: 42, 43, 87, 88
Duralion Meuser WINGLETS IN YOUR FUTURE Winglets small nearly vertical winglike surfaces mounted tips wing Recent NASA tests have shown propT#pica/ q,9Iet section Wing/ct i dug Upper-4 Loive root -7 Lo*wr 4 -ii 38 erly designed winglets reduced induced drag about 20% increased wing lift-drag ratio about 9% aircraft tested 14IcK C 65C ZC 5Zl /50 surface -F--- 4 geipw surface tip plates employed Garamis Strato Streak decades ago well known fact such tip plates patented Lancaster 1897 Arent winglets same thing long shot Tip plates characteristically low-aspect-ratio surfaces set parallel aircraft center line inhibit spillage air bottom wing fuzz up tip vortices reduce induced drag own frictional drag usually compen sates decrease induced drag difference between tip plates winglets innovative contribution NASAs Richard Whitcomb state art winglets efficient high-aspectratio surfaces carefully designed placed set angle incidence con trived produce best result cam bered proper airfoil section doubt winglets will have much im pact free-flight model aviation competition classes say winglets will appear World Champs-winning FAI Power model days often features survive indeed become fashionablenot cause superiority merely lack clear-cut inferiority span-limited eventsPayload Cargo FAI-Indoor Pennyplane Novice Pennyplanewinglets might indeed prove useful other events simplest way reduce induced drag increase span Further remember winglets lifting surfaces set incidence angle class climb near ly vertical speed under power much greater glide speed induced dragdrag resulting lift during climbis negligible anyhow winglets under such conditions can add drag understand winglets work re duce induced drag must first under stand what induced drag about .-"textbooks dont help much often fail distinguish between physical phe nomena mathematically convenient artifices best difficult subject So fasten seatbelts hang dear life go wing produces lift pressure / lower surface exceeds upper surface high-pressure air under wing tends move outward around N.the tips low-pressure region above wing results wing-tip vortices shown sketches Notice airflow downward region between vortices precisely wing happens vortices induce generally downward flow over wing drag effect produces -called induced drag effect wing flying through downward-sloping airflow field fly ing uphill lift forcethe force per pendicular airflowslopes back wards has component parallel flight path drag component drag resulting lift termed induced drag NASA winglets may cure-all free-flight models have spectacular success Varieze pg 20 Feb 1976 MA cruises 30% power62-hp Volkswagen engineat 135 mph 186 75% carries two people 1000 miles 70 miles per gallon 1 K~// / 1 / / / $1 /7% 2eor /\ \/\ \ j I N Fop vew What noteworthy about Whitcomb wingletshe man devised coke bottle fuselage vital breaking through so-called sound barrieris very great reduction induced drag diagram representation induced air flow about normal wing 2 42 Model Aviation Anything makes tip vortex less intensesuch increasing spanor spreads out diffusing over larger volume air tends decrease duced drag biplane has less induced drag monoplane having same span lift example because splits tip vortex half flow above wing inward winglet arranged above wing tip such way push air outward has desired effect Now comes neat trick upper winglets actually toed out washed out might think would push air wrong direc tion winglet flying flow field canted inward greater angle angle incidence winglet So winglet still produces lift further since lift directed per pendicular local air flow winglet lift contributes thrust component Pretty snazzy eh appears proper design winglets pretty tricky affair cant expect glue set old Sweepette wings tips ten-year-old Starduster 600 arbitrary angle achieve desired result Thats obvious darn might worth try NASAs results summarized following report NASA TN D-8260 Design Approach Selected WindTunnel Results High Subsonic Speeds Wing-Tip Mounted Winglets Richard T Whitcomb Langley Research Center report sale public National Technical Information Service Springfield Virginia 22161 $375 Id like thank Hewitt Phillips NASA explaining sure hope got straight National Free Flight Society 1977 Model Year Awards International Classes FAI Wakefield Nordic A-2 Engine Power Coupe DHiver Walt Ghio Bob Isaacson Larry Conover Georges Matherat France Flux Wishbone Lucky Lindy Les Trumeaux AMA Power Small l/2A Large B C Indoor Stick FAI Stick Jim Clem Jim Clem Bob Hanford Indoor Rubber Power Dick Kowalski Bud Romak Rubber-powered Speed A-i Nordic Special Class Jim Lewis Mike Fedor Okie Bird Scrambler Super Star Grand Gram Quail Lil Hooker selection committee included Ed Carroll FAI Tony Italiano AMA Gas Jim Richmond Indoor Charlie Sotich Special Clarence Mather Chairman eighth consecutive year Model Year awards Drawings photos articles about models will appear National Free Flight Society Symposium Report will available Nats mail order NFFS Customarily awardees display describe models NFFS Symposium held Nats Kowalskis model described December 1976 issue column Romaks February 1977 issue Jim Lewis Quail appeared May 1976 issue Clems Scrambler 1976 issue August1977 43 Continued page 87 Jones Balsa Stripper cutting sheet stock strips now equipped both inch metric scales scales can retrofitted earlier model handy stripper Bob finds hot-melt glue gun great tool have handy zapping dihedral jigs such Glue slugs lower left Georgias Harry Grogan Class C Witch Doctor 800 snapped Dave Linstrum recent KOI Popular model Sig kit Note extra bracing Covering Monokote two readers sent lengthy reports eight pages long said bum blebee cannot fly Anyway incredible may seem record stands what worth Austrian representa tive World Championship South Africa Karl Wasner witness flight Although acting official gave lengthy description scribe record-breaking flight attempts before electronic timers used runs respect spent time much effort offering criticism may reminded column does serve sounding board ideas opinions However in-depth study records dispute same should directed AMA HQ US aeromodeling representa tive FAI transmissionwhich did case Sitar record Dan Pruss Rt 2 Box 490 Plainfield IL 60544 FF Duration/Meuser continued page 43 Ruff Stuff Thats trade name some rather special sandpaper put out Ap plied Design Corporation marketed through Sig Basically plain old Nor ton Garnet Finishing Paper Whats special about backing back coating no-lickum stickumself adhesive coating preferprotected peel-off paper covering Cut oversize peel off peel-off backing stick object choice trim edges object choice might dowel proper size fillets favorite scale model gently arched stick putting undercamber Wake field prop flat surface large enough accept full-size sheet latter will handier might think example sanding down indoor glider wing sandpaper-coated surface pre vents wing slipping around sanding second sand paper-covered sheet balsa too will come handy truing up end rib wing panel just prior making dihedral joint modeling applica tions better have sandpaper nailed down move model part back forth over usual method holding part sloshing sandpaper back forth Try see sheets standard 9 X 1 size Sigs price package 36 sheets12 medium bOA 12 fine 180A 12 super-fine 280Ais $14 about 30% would pay plain garnet paper Perhaps dealer will sell sheet ask him nicely Jones Balsa Stripper Revisited last Julys issue mentioned nifty balsa stripper available Jim Jones $1080 postpaid 36631 Ledgestone Mt Clem pcfm Industries Inc 7060 HOLLYWOOD BLVD LOS ANGELES CA 90028 ens MI 48043 newer ones cali brated increments 005 inches 01 mm Thats right both inch metric calibrations provided already have earlier non-calibrated models Jim will send stick-on scale return stamped selfaddressed envelope have difficulty finding double-edge razor blades will snap properly provide sharp cutting point send another $5 Jim hundred postpaid can shave like Jim says doesnt mind Glue Gun Home craftsmen come two varieties true craftsman does better job professionals al though takes him three times long b tool freak owns tool known man doesnt know use wouldnt have anything use did know Im too humble classify myself seem have quite collection goofy tools come two varieties couldnt see could live owning never used after bought b thought would never have use bought anyhow now use almost daily seven-dollar hot-melt glue gun latter Mine Thermogrip manufactured USM Corporation August1977 87 iH CAYmAf/m/ TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Aura I 50191 HOT FUEL PROOF DOPE EXCLUSIVE LOWHEAT AWARD WINNINGCOVERING FOR GlUMFilm HIGLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel proof lightweight MORE wiMriO 0$ safle power YELLOW G0 ~ee e6 ELL G~ 9e~e cp$e edoo 405e do. O150 S S 854 8-6 68 96 106 104550 MetallicMi. er 5550 IflY ACE 17/ SPAN STOCK NO PP 15 KIT $425 0 WILNT SCALE ASK FOR OUR KITS AND ACCESSORIES AT YOUR LOCAL DIALER IF NOT AVAILARLE AT TOUR DEALER ORDER DIRECT ADD AGE POSTAGE BlOWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CNAEGEE AND 5 SIZES OF TANKS EROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS YMRRE B adr T acto 5354e h a-25354304 Bade6364354 Pusher747678504 SIeach848888654 53 5W4949-69798 6364 10-4106854 8-685411-4 116 1181 96506l RC 124 3 BIaEIR TracSr125 126 E 5 5354 6-364 504 ORISH 3BIade PusherBROS 6-3 504 57 JOHN INDIANA 46373 WALNUT SCALE KITS RARY ACE .. $425 PEANUT SCALE KITS PIPER J3 CUR$329 PIETENPOS$329 MILES 9 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR.. $349 ANDREASON$349 GIPSY MOTN $349 GANAGOBIE$349 SPORT MODEL KITS ONE NITE 2H$475 ONE NITE 18$349 STONGLESS WONDER$249 PECK ROG$139 KITS 0 PLANS 0 ACCESEORIRE REAL JAPANESE TISSUE-PROPS COMPLETE CATALOG 504 MANY HARD TO FIND ITEMS PO BOX 24W -AMALA MESA CAUF 92041 iwwgyIeersPHONE 17141 4694675 1 442-4636 Several brands available work about same Plug cord wall wait two minutes grasp gun pistol grip push cylinder glue head application little pressure thumb glue squirts out nozzle glue simply thermo-plas tic material cools hardens allows about 15 seconds position parts gluing press together about minute have bond strong wood itself can also used join metal leather rub ber plastics rigid foam materials could probably build whole airplane using would weigh ton have used mostly zapping gether dihedral jigs jig drilling holes proper angle blade folding prop partition across model box goodie hold wing fuselage scale model glued struts place such imagine Ill find use models themselvesperhaps securing firewall place think could used things pres ently use epoxy much fuss mess having wait interminable five minutes Try avoid getting hot glue fingers smarts Heat-Shrink Tubing plastic tub ing available electronics supply sources Upon application heat shrinks less half its original di ameter wall thickens same pro portion length remains same smallest size have seen starts out life l/16 id 00035e wall heated shrinks id bit under O020e making nice sliding fit over 15-mil wire makes neat hub reinforce ments wheels used light indoor models Shrunk over prop shaft rear hook Pennyplane similar model made 20-mil larger wire helps prevent thin wire cutting rubber adds negligible weight Want piece tubing having precise inside diameter substitute miserable rolled-tissue tubes used door models some part scale model Shrink tubing over piece music wire shank twist drill thin wall start smallest size tubing will just fit over mandrel thicker wall use larger tubing still thicker wall shrink several pieces over other tubing available wide variety colors diameters wall thicknesses hardnesses electronics hobby stores Bob Meuser 4200 Gregory St Oak land CA 94619 FF Indoor/Tenny continued page 44 indoors Almost nothing happened long time Eds first model built heavy purpose over 7 oz man aged 3408 blimp hangar Lake hurst really wasnt indoor model wasnt what Ed after small groups around country tried Miami Indoor Aircraft Model Assoc MIAMA based Miami Florida course began regular sessions ex perience led rules Airframe weight Less rubber4 grams minimum Overall length Measured front prop bearing aft20e maximum Fuselage Must support enclose single rubber motor no motor sticks b Must include exceed box 2/2 X 4 X 2 no diamond shapes c Must have windshield 2 sq minimum area window side sq minimum area covered cellophane similar material Prop Solid wood direct drive fixed pitch Wing Unbraced monoplane 4 maximum chord 20 projected span Landing gear Rigid fixed least two wheels 1 minimum diameter Flying flights ROG unlimited tempts record 5 flights Flights less 20 seconds attempts Best flight counts Covering Except windshield windowspaper covering No film microlite Using above rules MIAMA sponsored two major contests 1976 will repeat 1977 NIMAS Inter national Record Trials held Atrium Northwood Institute five contestants flew Manhattan Formula models Bucky Servaites winning 4528 Nats Dan Domina proxy-flew John Triolos Manhattan winning time 8097 two meets break ice terest began grow considerable cor respondence has exchanged regarding future event possible new rules meantime same rules will used 1977 predictions being made about some Manhattan For88 Model Aviation FL Wit RUDDER UR KITS S SSORIES MR MODELER manufacture special ized accessories make R/C modeling easier never out stock items manufacture Seeyour deal er send first class stamp catalog sheets listing over 70 items complete pictures prices OVER 12 YEARS SERVICE
Edition: Model Aviation - 1977/08
Page Numbers: 42, 43, 87, 88
Duralion Meuser WINGLETS IN YOUR FUTURE Winglets small nearly vertical winglike surfaces mounted tips wing Recent NASA tests have shown propT#pica/ q,9Iet section Wing/ct i dug Upper-4 Loive root -7 Lo*wr 4 -ii 38 erly designed winglets reduced induced drag about 20% increased wing lift-drag ratio about 9% aircraft tested 14IcK C 65C ZC 5Zl /50 surface -F--- 4 geipw surface tip plates employed Garamis Strato Streak decades ago well known fact such tip plates patented Lancaster 1897 Arent winglets same thing long shot Tip plates characteristically low-aspect-ratio surfaces set parallel aircraft center line inhibit spillage air bottom wing fuzz up tip vortices reduce induced drag own frictional drag usually compen sates decrease induced drag difference between tip plates winglets innovative contribution NASAs Richard Whitcomb state art winglets efficient high-aspectratio surfaces carefully designed placed set angle incidence con trived produce best result cam bered proper airfoil section doubt winglets will have much im pact free-flight model aviation competition classes say winglets will appear World Champs-winning FAI Power model days often features survive indeed become fashionablenot cause superiority merely lack clear-cut inferiority span-limited eventsPayload Cargo FAI-Indoor Pennyplane Novice Pennyplanewinglets might indeed prove useful other events simplest way reduce induced drag increase span Further remember winglets lifting surfaces set incidence angle class climb near ly vertical speed under power much greater glide speed induced dragdrag resulting lift during climbis negligible anyhow winglets under such conditions can add drag understand winglets work re duce induced drag must first under stand what induced drag about .-"textbooks dont help much often fail distinguish between physical phe nomena mathematically convenient artifices best difficult subject So fasten seatbelts hang dear life go wing produces lift pressure / lower surface exceeds upper surface high-pressure air under wing tends move outward around N.the tips low-pressure region above wing results wing-tip vortices shown sketches Notice airflow downward region between vortices precisely wing happens vortices induce generally downward flow over wing drag effect produces -called induced drag effect wing flying through downward-sloping airflow field fly ing uphill lift forcethe force per pendicular airflowslopes back wards has component parallel flight path drag component drag resulting lift termed induced drag NASA winglets may cure-all free-flight models have spectacular success Varieze pg 20 Feb 1976 MA cruises 30% power62-hp Volkswagen engineat 135 mph 186 75% carries two people 1000 miles 70 miles per gallon 1 K~// / 1 / / / $1 /7% 2eor /\ \/\ \ j I N Fop vew What noteworthy about Whitcomb wingletshe man devised coke bottle fuselage vital breaking through so-called sound barrieris very great reduction induced drag diagram representation induced air flow about normal wing 2 42 Model Aviation Anything makes tip vortex less intensesuch increasing spanor spreads out diffusing over larger volume air tends decrease duced drag biplane has less induced drag monoplane having same span lift example because splits tip vortex half flow above wing inward winglet arranged above wing tip such way push air outward has desired effect Now comes neat trick upper winglets actually toed out washed out might think would push air wrong direc tion winglet flying flow field canted inward greater angle angle incidence winglet So winglet still produces lift further since lift directed per pendicular local air flow winglet lift contributes thrust component Pretty snazzy eh appears proper design winglets pretty tricky affair cant expect glue set old Sweepette wings tips ten-year-old Starduster 600 arbitrary angle achieve desired result Thats obvious darn might worth try NASAs results summarized following report NASA TN D-8260 Design Approach Selected WindTunnel Results High Subsonic Speeds Wing-Tip Mounted Winglets Richard T Whitcomb Langley Research Center report sale public National Technical Information Service Springfield Virginia 22161 $375 Id like thank Hewitt Phillips NASA explaining sure hope got straight National Free Flight Society 1977 Model Year Awards International Classes FAI Wakefield Nordic A-2 Engine Power Coupe DHiver Walt Ghio Bob Isaacson Larry Conover Georges Matherat France Flux Wishbone Lucky Lindy Les Trumeaux AMA Power Small l/2A Large B C Indoor Stick FAI Stick Jim Clem Jim Clem Bob Hanford Indoor Rubber Power Dick Kowalski Bud Romak Rubber-powered Speed A-i Nordic Special Class Jim Lewis Mike Fedor Okie Bird Scrambler Super Star Grand Gram Quail Lil Hooker selection committee included Ed Carroll FAI Tony Italiano AMA Gas Jim Richmond Indoor Charlie Sotich Special Clarence Mather Chairman eighth consecutive year Model Year awards Drawings photos articles about models will appear National Free Flight Society Symposium Report will available Nats mail order NFFS Customarily awardees display describe models NFFS Symposium held Nats Kowalskis model described December 1976 issue column Romaks February 1977 issue Jim Lewis Quail appeared May 1976 issue Clems Scrambler 1976 issue August1977 43 Continued page 87 Jones Balsa Stripper cutting sheet stock strips now equipped both inch metric scales scales can retrofitted earlier model handy stripper Bob finds hot-melt glue gun great tool have handy zapping dihedral jigs such Glue slugs lower left Georgias Harry Grogan Class C Witch Doctor 800 snapped Dave Linstrum recent KOI Popular model Sig kit Note extra bracing Covering Monokote two readers sent lengthy reports eight pages long said bum blebee cannot fly Anyway incredible may seem record stands what worth Austrian representa tive World Championship South Africa Karl Wasner witness flight Although acting official gave lengthy description scribe record-breaking flight attempts before electronic timers used runs respect spent time much effort offering criticism may reminded column does serve sounding board ideas opinions However in-depth study records dispute same should directed AMA HQ US aeromodeling representa tive FAI transmissionwhich did case Sitar record Dan Pruss Rt 2 Box 490 Plainfield IL 60544 FF Duration/Meuser continued page 43 Ruff Stuff Thats trade name some rather special sandpaper put out Ap plied Design Corporation marketed through Sig Basically plain old Nor ton Garnet Finishing Paper Whats special about backing back coating no-lickum stickumself adhesive coating preferprotected peel-off paper covering Cut oversize peel off peel-off backing stick object choice trim edges object choice might dowel proper size fillets favorite scale model gently arched stick putting undercamber Wake field prop flat surface large enough accept full-size sheet latter will handier might think example sanding down indoor glider wing sandpaper-coated surface pre vents wing slipping around sanding second sand paper-covered sheet balsa too will come handy truing up end rib wing panel just prior making dihedral joint modeling applica tions better have sandpaper nailed down move model part back forth over usual method holding part sloshing sandpaper back forth Try see sheets standard 9 X 1 size Sigs price package 36 sheets12 medium bOA 12 fine 180A 12 super-fine 280Ais $14 about 30% would pay plain garnet paper Perhaps dealer will sell sheet ask him nicely Jones Balsa Stripper Revisited last Julys issue mentioned nifty balsa stripper available Jim Jones $1080 postpaid 36631 Ledgestone Mt Clem pcfm Industries Inc 7060 HOLLYWOOD BLVD LOS ANGELES CA 90028 ens MI 48043 newer ones cali brated increments 005 inches 01 mm Thats right both inch metric calibrations provided already have earlier non-calibrated models Jim will send stick-on scale return stamped selfaddressed envelope have difficulty finding double-edge razor blades will snap properly provide sharp cutting point send another $5 Jim hundred postpaid can shave like Jim says doesnt mind Glue Gun Home craftsmen come two varieties true craftsman does better job professionals al though takes him three times long b tool freak owns tool known man doesnt know use wouldnt have anything use did know Im too humble classify myself seem have quite collection goofy tools come two varieties couldnt see could live owning never used after bought b thought would never have use bought anyhow now use almost daily seven-dollar hot-melt glue gun latter Mine Thermogrip manufactured USM Corporation August1977 87 iH CAYmAf/m/ TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Aura I 50191 HOT FUEL PROOF DOPE EXCLUSIVE LOWHEAT AWARD WINNINGCOVERING FOR GlUMFilm HIGLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel proof lightweight MORE wiMriO 0$ safle power YELLOW G0 ~ee e6 ELL G~ 9e~e cp$e edoo 405e do. O150 S S 854 8-6 68 96 106 104550 MetallicMi. er 5550 IflY ACE 17/ SPAN STOCK NO PP 15 KIT $425 0 WILNT SCALE ASK FOR OUR KITS AND ACCESSORIES AT YOUR LOCAL DIALER IF NOT AVAILARLE AT TOUR DEALER ORDER DIRECT ADD AGE POSTAGE BlOWN CO-2 ENGINES ENGINES ARE IN STOCK NEW CNAEGEE AND 5 SIZES OF TANKS EROWN ENGINES MUST RE ORDERED DIRECT FROM PECK-POLYMERS YMRRE B adr T acto 5354e h a-25354304 Bade6364354 Pusher747678504 SIeach848888654 53 5W4949-69798 6364 10-4106854 8-685411-4 116 1181 96506l RC 124 3 BIaEIR TracSr125 126 E 5 5354 6-364 504 ORISH 3BIade PusherBROS 6-3 504 57 JOHN INDIANA 46373 WALNUT SCALE KITS RARY ACE .. $425 PEANUT SCALE KITS PIPER J3 CUR$329 PIETENPOS$329 MILES 9 TURRULENT$329 MUSTANG$349 ZERO$349 COUGAR.. $349 ANDREASON$349 GIPSY MOTN $349 GANAGOBIE$349 SPORT MODEL KITS ONE NITE 2H$475 ONE NITE 18$349 STONGLESS WONDER$249 PECK ROG$139 KITS 0 PLANS 0 ACCESEORIRE REAL JAPANESE TISSUE-PROPS COMPLETE CATALOG 504 MANY HARD TO FIND ITEMS PO BOX 24W -AMALA MESA CAUF 92041 iwwgyIeersPHONE 17141 4694675 1 442-4636 Several brands available work about same Plug cord wall wait two minutes grasp gun pistol grip push cylinder glue head application little pressure thumb glue squirts out nozzle glue simply thermo-plas tic material cools hardens allows about 15 seconds position parts gluing press together about minute have bond strong wood itself can also used join metal leather rub ber plastics rigid foam materials could probably build whole airplane using would weigh ton have used mostly zapping gether dihedral jigs jig drilling holes proper angle blade folding prop partition across model box goodie hold wing fuselage scale model glued struts place such imagine Ill find use models themselvesperhaps securing firewall place think could used things pres ently use epoxy much fuss mess having wait interminable five minutes Try avoid getting hot glue fingers smarts Heat-Shrink Tubing plastic tub ing available electronics supply sources Upon application heat shrinks less half its original di ameter wall thickens same pro portion length remains same smallest size have seen starts out life l/16 id 00035e wall heated shrinks id bit under O020e making nice sliding fit over 15-mil wire makes neat hub reinforce ments wheels used light indoor models Shrunk over prop shaft rear hook Pennyplane similar model made 20-mil larger wire helps prevent thin wire cutting rubber adds negligible weight Want piece tubing having precise inside diameter substitute miserable rolled-tissue tubes used door models some part scale model Shrink tubing over piece music wire shank twist drill thin wall start smallest size tubing will just fit over mandrel thicker wall use larger tubing still thicker wall shrink several pieces over other tubing available wide variety colors diameters wall thicknesses hardnesses electronics hobby stores Bob Meuser 4200 Gregory St Oak land CA 94619 FF Indoor/Tenny continued page 44 indoors Almost nothing happened long time Eds first model built heavy purpose over 7 oz man aged 3408 blimp hangar Lake hurst really wasnt indoor model wasnt what Ed after small groups around country tried Miami Indoor Aircraft Model Assoc MIAMA based Miami Florida course began regular sessions ex perience led rules Airframe weight Less rubber4 grams minimum Overall length Measured front prop bearing aft20e maximum Fuselage Must support enclose single rubber motor no motor sticks b Must include exceed box 2/2 X 4 X 2 no diamond shapes c Must have windshield 2 sq minimum area window side sq minimum area covered cellophane similar material Prop Solid wood direct drive fixed pitch Wing Unbraced monoplane 4 maximum chord 20 projected span Landing gear Rigid fixed least two wheels 1 minimum diameter Flying flights ROG unlimited tempts record 5 flights Flights less 20 seconds attempts Best flight counts Covering Except windshield windowspaper covering No film microlite Using above rules MIAMA sponsored two major contests 1976 will repeat 1977 NIMAS Inter national Record Trials held Atrium Northwood Institute five contestants flew Manhattan Formula models Bucky Servaites winning 4528 Nats Dan Domina proxy-flew John Triolos Manhattan winning time 8097 two meets break ice terest began grow considerable cor respondence has exchanged regarding future event possible new rules meantime same rules will used 1977 predictions being made about some Manhattan For88 Model Aviation FL Wit RUDDER UR KITS S SSORIES MR MODELER manufacture special ized accessories make R/C modeling easier never out stock items manufacture Seeyour deal er send first class stamp catalog sheets listing over 70 items complete pictures prices OVER 12 YEARS SERVICE
