Free Flight Duration Free Flights Top Ten National Free Flight Society announces recipients its ten Free Flight Model Year awards 1975 pole position receiving second such NFFS award Bill Bob Hunter greatest spectacle free flight Satel lite 226 Check new GLH series predict will due another NFFS award along about 1977 Big Red Johnson gets nod Tarter 800 highly successful Southern Cal competition FAI Power award goes US team member nor World Champs winner guy stuck con cept knew right Bill Gieskieng flapped-wing concept exemplified Siren-Dippity Wakefield have John Gard received award Out standing long-motor-run still-air machine Roger Jean Louis Garrigou France Coupe dHiver phenomenon began receive well-deserved recognition successful popular Garricoupe won 1973 Nats among other things could NFFS fail recognize longest officially recorded indoor flight ever Erv Rod emsky got second NFFS award aptly named 600 sq Monster has posted flight 45 mm 50 sec Steve Geraghty developed crummy looking little mite hand-launch glider anyone can build couple hours win contests named Driftwould NFFS doesnt have award guy has come closest winning Mul vihill Trophy often never quite got together instead gave George Perryman award design Little Daddy won Mulvihill hands another Don Chancey collected second NFFS award Canned Heat rocket-power model number ten award went Hans Seelig Seelig Multi-Function Timer 22 Model Aviation Bob Meuser has dominated field cutting engine power wiggling tails FAI-Power models world wide years Now could get price down Bob Stalick head committee 15 plus dozen consultants made selec tions promises construction drawings of models will available through NFFS Plans Service usual addition stories three-views will appear NFFS Sympo report complete list plans including Model Year awardees previous years write Larry Jordan 5641 Diamond Heights Blvd San Francisco CA 94131 Cathexis Airroil August issue men tioned unusual airfoil used Dave Par sons Cathexis FAI-Power model air foil developed Hank Cole back Fifties Daves version didnt come out quite extreme hump leading edge Hanks story gave airfoil designation CP5408 translates 5% camber 40% chord 8% thickness 25% chord P stands power since airfoil designed 1957-1960 FAI Power models models noted exceptional glide However downdraft knocked off Power team guess air foil never became popular Anyway know Parsons tried recently has excellent results Several notable features airfoil its extremely blunt leading edge provides adequate turbulation flat front portion lower surface works well boxspar construction Also note droop nose ef fect camber line near leading edge Some people prefer sharper leading edge Power reduce drag during climb Reynolds-number range doubt could measure difference drag between blunt sharp leading edges airfoil derived family air foils conceived back 1942 1944 flying wings Air Trails 1944 Model Annual blunt-nosed sections obtained trans forming Davis airfoil formulas Air Trails May 1942 another dimension think means push through hole space-time continuum eh Hank formulas quite general simply give smooth curve continuous derivatives have know general shape airfoil want manipulate equations produce such shape particular seems work first contacted Dave about airfoil suggested perhaps would prefer sit information awhile before publishing would have chance reap benefits fear competition response No publish Whatever success have due willingness other modelers give information might help wouldnt fair didnt same So Advanced copies sent members US FAI Power Team incidentally Electric Propulsion dont intend plugging electric propulsion month things keep happening think might like know about latest happening new system introduced recently VL Products 7023-D Canoga Ave Canoga Park CA 91303 heart system Hytork 48 geared motor motor Mabuchi RE-26 same size used Mattel Monogram units guts may may same Im quite ready ruin find out gear reducer leg up anything have seen model propulsion planetary gear set Planetary gearing has several advantages over conventional gearing symmet rical construction eliminates side force front motor bearing large source fric tion second advantage compactness prop shaft line motor shaft gearing adds little overall size motor Gear ratio 48about same original Super Star unitsand prop fur nished familiar Mattel prop Four batteries available using Ni-Cd cells first three batteries consist two three four cells same size used Mattel unit fourth battery consists three AA size penlight cells designated multi-motor models battery single motor duration powered flight would around three minutes might just thing schoolyard singlechannel R/C models Coupe dHiver international class rubber-power model built kit R/N Products ideal first step toward Wakefield international event flown World Champs Competition CP5408 ar hwx CoLe X 0 /2525 5 75 /0/5202530405060706090/00 U 074 * 3 6o 66 7883 6y90 68 &z Z 6i 46 2910 2 0-062 -075 -v6 -o4 -03 00 0609 1 14 12 10 cA 050 small two-cell pack performance modest weight low making fine scale sport models around 30-inch wing span three-cell battery gives flashier per formance sufficient power ruggedly built scale models about 36-in wingspan Duration powered flight 30 45 seconds four-cell battery performance astounding Vertical take-offs possible pro vided airframe weight equal less propulsion system weight have built ade quately rugged electric free-flight models airframe weights between half third propulsion system weight clear performance potential ap proaching gas powered models Hal Cover has four-cell unit rebuilt Coupe d Hiver model have recently installed mini-oldtimer intended 020 Cox engine Strato Streak built Cal Aeros fine kits All-up weight including convenient unnecessary Tatone timer 57 oz Both models VTO nicely Lots nice engineering has gone VL system example rather use com mercial switch charging jack VL developed its own lightweight unit serves both func tions cleverly contrived go switch cannot turned charging plug plugged nor can charger plugged switch connec tions made push-em-together connectors charging units incorporate place wind up cord VL peddles variety chargers do-it-yourself artist maddening array meters timers like example motorcycle battery VL used charging Ni-Cd flight batssells less half price local cycle shop slightly modified Mattel-type prop goes mere 60 should interest rubber-power speed scale sport fliers too instruction booklets catalog exceptionally clear complete know exactly what get money make function properly Send catalog find Out yourself New Coupe Kit dont intend make column solely new products review sort thing much hassle free flight knowing buy things often available mill-run hobby shops So cottage industry types crank out various nifty goodies free flight will keep formed Ill give free plug now again get point can afford classy ads wont able help much mentioned Coupe de Villea Coupe d Hiver class model also doubles Un limited Rubber modelin July column July 1973 issue American Aircraft Modeler mentions Tyro-Combo also two-event rubber model best knowledge Coupe kits going until trumpet fanfares Slats introduced R/N Products formerly Peterson Products P0 Box 2527 Lancaster CA 93534 also peddle number free-flight scale sport models rubber power 01 05 engines dont drop line Book Review Aero Modeller Annual 1974197S Annual general model avia tion publication enough free-flight material satisfy avid specialist three-view drawings three 1973 World Champ models plus 20 other free flight models articles airfoils peanut scale model tracking device bubble machine Coupe models make fast-burning fuse vari able incidence tails rubber-power models among others three-views include world champions international contest winners record setters aplenty will appeal sport flyer too articles run head-in-the-clouds theoretical down-to-earth practical much free flight material might ask what RC CL modelers Mind complaining Weighing scales frontispiece V E Johnsons 1910 book Model Aeroplaning engraving weighing balance caption reads important tool build ing model aeroplanes Some things never change Most accurate two-pan balance its inconvenience operation virtually rules out purposes Much convenient triple-arm balance Ohaus Model 700 has no competitors Sliding weights cover range up 610 grams added weights extend up 2610 grams roughly 6 lb smallest increment sliding weight 1/10 gram balance actually sensitive accurate about amount throughout its entire range Some balances price tag $49 plus $1 range-extending weights similar model calibrated pounds ounces available higher cost latest models feature magnetic damping indoor modeling / 10-gram sensitivity far too coarse satisfactory commer cially available scale am aware manufactured Ray Harlan 15 Happy Hol low Rd Wayland Mass 01778 Both metric blimey English versions available metric weighs 14 grams gradu ations 005 grams English goes 005 oz steps 00002 oz precision device having metal beam hardened steel knife edges resting agate V-blocks mag netic damping Price $30 plus postage Juggling sliding weight back forth until balance obtained can time-consum continued page 70 September 1975 23 lompIete ready-to-install electric propulsion system VL Products Battery having two three four cells can used depending power requirements Meuser Photo Right Hal Cover VTOs Coupe dHiver-size model powered VI Products unit Meuser Photo Below Desouter Monoplane Bill Warner has VI electric system natural scale models about 36 span Design E Fillon mid-thirties Wakefield winner fRill Warner Photo FF Duration continued page 23 ing nuisance convenience direct reading scale tops two types em ploying swinging weights employing springs Details engineering work manship important inherent difference between two types smaller ones selling $5 $15 pretty fair maximum range 8 oz 2 lb ones sold stationery stores postal scales diffi culty postal scales gradu ated steps e take trouble add intermediate graduationsor perhaps gram scale toothey much useful Typically accuracy about 2 percent midscale reading Handiest small enough carry toolbox least accurate little handheld direct reading scales local post office will sell weighs up 4 oz $210 Mid-scale accuracy about 5 percent accuracy top end much worse calibrations extremely non-linearcrowded near top endbut has its advantages sensitivity good lower end scale can get least approximate measure heavier weights better Similar scales sensitive sold proper hi-fl component shops stylus pressure gages Accuracy might poor check its calibrations re-calibrate it might quite satisfactory Sensitivity lower end typically /8 gram have calibrated infinity goes past infinity mark load 20 grams What look large total scale length 6-in-diameter dial three times good 6-in straight scale Sensitivity far does indicator move ounce gram Exces sive sensitivity however can sometimes nuisance Calibration accuracy accurately calibration marks placed Difficult check store Freedom friction weight pan push weight down slightly release gradually note reading push weight up slightly release gradually again note reading readings noticeably different dont buy Ruggedness durability convenience size appearance may may important Above importance suitability weighing kinds model parts use frequently address 4200 Gregory St Oakland Ca 94619 Whoopee Perunagloss Coverite finally Super tough woven fabric Requires no paint because already has 4 coats no-scratch paint bonded its upper surface Contains Quik-Stik miracle iron-on adhesive Will tear scratch pucker crack peel sag Waterproof fuelproof & fadeproof COVERITE 112 Chestnut Street Phila Pa 19106 Rubber Lube Made formula liobert Taylor contest use several years lube does contain castor oil can deteriorate rubber rubbed rubber obtain turns produce thrust handy 3 oz squeeze bottle sells $149 Peck-Polymers PO Box 2498 La Mesa Calif 92041 producneviewproductreviewproduc,evgewpodu0tr0vjew 70 Model Aviation Above OhausModel 700 triple-beam balance sensitive accurate rather expensive Below Har land Indoor-model balance commercially available scale indoor very fine product rocket-size postal scale purchased trom local post office cheap handy Small size tendency oscillate limit its accuracy oroductroviewp8oductrevewproducteuiewpoduc,0vjew Above Hamilton Postal Scale several capacities available Inexpensive convenient limited accuracy suitable modeling Below Stylus Pressure Gage phonograph tone arms Cheap convenient requires recall bration useful Carry tool box
Edition: Model Aviation - 1975/09
Page Numbers: 22, 23, 70
Free Flight Duration Free Flights Top Ten National Free Flight Society announces recipients its ten Free Flight Model Year awards 1975 pole position receiving second such NFFS award Bill Bob Hunter greatest spectacle free flight Satel lite 226 Check new GLH series predict will due another NFFS award along about 1977 Big Red Johnson gets nod Tarter 800 highly successful Southern Cal competition FAI Power award goes US team member nor World Champs winner guy stuck con cept knew right Bill Gieskieng flapped-wing concept exemplified Siren-Dippity Wakefield have John Gard received award Out standing long-motor-run still-air machine Roger Jean Louis Garrigou France Coupe dHiver phenomenon began receive well-deserved recognition successful popular Garricoupe won 1973 Nats among other things could NFFS fail recognize longest officially recorded indoor flight ever Erv Rod emsky got second NFFS award aptly named 600 sq Monster has posted flight 45 mm 50 sec Steve Geraghty developed crummy looking little mite hand-launch glider anyone can build couple hours win contests named Driftwould NFFS doesnt have award guy has come closest winning Mul vihill Trophy often never quite got together instead gave George Perryman award design Little Daddy won Mulvihill hands another Don Chancey collected second NFFS award Canned Heat rocket-power model number ten award went Hans Seelig Seelig Multi-Function Timer 22 Model Aviation Bob Meuser has dominated field cutting engine power wiggling tails FAI-Power models world wide years Now could get price down Bob Stalick head committee 15 plus dozen consultants made selec tions promises construction drawings of models will available through NFFS Plans Service usual addition stories three-views will appear NFFS Sympo report complete list plans including Model Year awardees previous years write Larry Jordan 5641 Diamond Heights Blvd San Francisco CA 94131 Cathexis Airroil August issue men tioned unusual airfoil used Dave Par sons Cathexis FAI-Power model air foil developed Hank Cole back Fifties Daves version didnt come out quite extreme hump leading edge Hanks story gave airfoil designation CP5408 translates 5% camber 40% chord 8% thickness 25% chord P stands power since airfoil designed 1957-1960 FAI Power models models noted exceptional glide However downdraft knocked off Power team guess air foil never became popular Anyway know Parsons tried recently has excellent results Several notable features airfoil its extremely blunt leading edge provides adequate turbulation flat front portion lower surface works well boxspar construction Also note droop nose ef fect camber line near leading edge Some people prefer sharper leading edge Power reduce drag during climb Reynolds-number range doubt could measure difference drag between blunt sharp leading edges airfoil derived family air foils conceived back 1942 1944 flying wings Air Trails 1944 Model Annual blunt-nosed sections obtained trans forming Davis airfoil formulas Air Trails May 1942 another dimension think means push through hole space-time continuum eh Hank formulas quite general simply give smooth curve continuous derivatives have know general shape airfoil want manipulate equations produce such shape particular seems work first contacted Dave about airfoil suggested perhaps would prefer sit information awhile before publishing would have chance reap benefits fear competition response No publish Whatever success have due willingness other modelers give information might help wouldnt fair didnt same So Advanced copies sent members US FAI Power Team incidentally Electric Propulsion dont intend plugging electric propulsion month things keep happening think might like know about latest happening new system introduced recently VL Products 7023-D Canoga Ave Canoga Park CA 91303 heart system Hytork 48 geared motor motor Mabuchi RE-26 same size used Mattel Monogram units guts may may same Im quite ready ruin find out gear reducer leg up anything have seen model propulsion planetary gear set Planetary gearing has several advantages over conventional gearing symmet rical construction eliminates side force front motor bearing large source fric tion second advantage compactness prop shaft line motor shaft gearing adds little overall size motor Gear ratio 48about same original Super Star unitsand prop fur nished familiar Mattel prop Four batteries available using Ni-Cd cells first three batteries consist two three four cells same size used Mattel unit fourth battery consists three AA size penlight cells designated multi-motor models battery single motor duration powered flight would around three minutes might just thing schoolyard singlechannel R/C models Coupe dHiver international class rubber-power model built kit R/N Products ideal first step toward Wakefield international event flown World Champs Competition CP5408 ar hwx CoLe X 0 /2525 5 75 /0/5202530405060706090/00 U 074 * 3 6o 66 7883 6y90 68 &z Z 6i 46 2910 2 0-062 -075 -v6 -o4 -03 00 0609 1 14 12 10 cA 050 small two-cell pack performance modest weight low making fine scale sport models around 30-inch wing span three-cell battery gives flashier per formance sufficient power ruggedly built scale models about 36-in wingspan Duration powered flight 30 45 seconds four-cell battery performance astounding Vertical take-offs possible pro vided airframe weight equal less propulsion system weight have built ade quately rugged electric free-flight models airframe weights between half third propulsion system weight clear performance potential ap proaching gas powered models Hal Cover has four-cell unit rebuilt Coupe d Hiver model have recently installed mini-oldtimer intended 020 Cox engine Strato Streak built Cal Aeros fine kits All-up weight including convenient unnecessary Tatone timer 57 oz Both models VTO nicely Lots nice engineering has gone VL system example rather use com mercial switch charging jack VL developed its own lightweight unit serves both func tions cleverly contrived go switch cannot turned charging plug plugged nor can charger plugged switch connec tions made push-em-together connectors charging units incorporate place wind up cord VL peddles variety chargers do-it-yourself artist maddening array meters timers like example motorcycle battery VL used charging Ni-Cd flight batssells less half price local cycle shop slightly modified Mattel-type prop goes mere 60 should interest rubber-power speed scale sport fliers too instruction booklets catalog exceptionally clear complete know exactly what get money make function properly Send catalog find Out yourself New Coupe Kit dont intend make column solely new products review sort thing much hassle free flight knowing buy things often available mill-run hobby shops So cottage industry types crank out various nifty goodies free flight will keep formed Ill give free plug now again get point can afford classy ads wont able help much mentioned Coupe de Villea Coupe d Hiver class model also doubles Un limited Rubber modelin July column July 1973 issue American Aircraft Modeler mentions Tyro-Combo also two-event rubber model best knowledge Coupe kits going until trumpet fanfares Slats introduced R/N Products formerly Peterson Products P0 Box 2527 Lancaster CA 93534 also peddle number free-flight scale sport models rubber power 01 05 engines dont drop line Book Review Aero Modeller Annual 1974197S Annual general model avia tion publication enough free-flight material satisfy avid specialist three-view drawings three 1973 World Champ models plus 20 other free flight models articles airfoils peanut scale model tracking device bubble machine Coupe models make fast-burning fuse vari able incidence tails rubber-power models among others three-views include world champions international contest winners record setters aplenty will appeal sport flyer too articles run head-in-the-clouds theoretical down-to-earth practical much free flight material might ask what RC CL modelers Mind complaining Weighing scales frontispiece V E Johnsons 1910 book Model Aeroplaning engraving weighing balance caption reads important tool build ing model aeroplanes Some things never change Most accurate two-pan balance its inconvenience operation virtually rules out purposes Much convenient triple-arm balance Ohaus Model 700 has no competitors Sliding weights cover range up 610 grams added weights extend up 2610 grams roughly 6 lb smallest increment sliding weight 1/10 gram balance actually sensitive accurate about amount throughout its entire range Some balances price tag $49 plus $1 range-extending weights similar model calibrated pounds ounces available higher cost latest models feature magnetic damping indoor modeling / 10-gram sensitivity far too coarse satisfactory commer cially available scale am aware manufactured Ray Harlan 15 Happy Hol low Rd Wayland Mass 01778 Both metric blimey English versions available metric weighs 14 grams gradu ations 005 grams English goes 005 oz steps 00002 oz precision device having metal beam hardened steel knife edges resting agate V-blocks mag netic damping Price $30 plus postage Juggling sliding weight back forth until balance obtained can time-consum continued page 70 September 1975 23 lompIete ready-to-install electric propulsion system VL Products Battery having two three four cells can used depending power requirements Meuser Photo Right Hal Cover VTOs Coupe dHiver-size model powered VI Products unit Meuser Photo Below Desouter Monoplane Bill Warner has VI electric system natural scale models about 36 span Design E Fillon mid-thirties Wakefield winner fRill Warner Photo FF Duration continued page 23 ing nuisance convenience direct reading scale tops two types em ploying swinging weights employing springs Details engineering work manship important inherent difference between two types smaller ones selling $5 $15 pretty fair maximum range 8 oz 2 lb ones sold stationery stores postal scales diffi culty postal scales gradu ated steps e take trouble add intermediate graduationsor perhaps gram scale toothey much useful Typically accuracy about 2 percent midscale reading Handiest small enough carry toolbox least accurate little handheld direct reading scales local post office will sell weighs up 4 oz $210 Mid-scale accuracy about 5 percent accuracy top end much worse calibrations extremely non-linearcrowded near top endbut has its advantages sensitivity good lower end scale can get least approximate measure heavier weights better Similar scales sensitive sold proper hi-fl component shops stylus pressure gages Accuracy might poor check its calibrations re-calibrate it might quite satisfactory Sensitivity lower end typically /8 gram have calibrated infinity goes past infinity mark load 20 grams What look large total scale length 6-in-diameter dial three times good 6-in straight scale Sensitivity far does indicator move ounce gram Exces sive sensitivity however can sometimes nuisance Calibration accuracy accurately calibration marks placed Difficult check store Freedom friction weight pan push weight down slightly release gradually note reading push weight up slightly release gradually again note reading readings noticeably different dont buy Ruggedness durability convenience size appearance may may important Above importance suitability weighing kinds model parts use frequently address 4200 Gregory St Oakland Ca 94619 Whoopee Perunagloss Coverite finally Super tough woven fabric Requires no paint because already has 4 coats no-scratch paint bonded its upper surface Contains Quik-Stik miracle iron-on adhesive Will tear scratch pucker crack peel sag Waterproof fuelproof & fadeproof COVERITE 112 Chestnut Street Phila Pa 19106 Rubber Lube Made formula liobert Taylor contest use several years lube does contain castor oil can deteriorate rubber rubbed rubber obtain turns produce thrust handy 3 oz squeeze bottle sells $149 Peck-Polymers PO Box 2498 La Mesa Calif 92041 producneviewproductreviewproduc,evgewpodu0tr0vjew 70 Model Aviation Above OhausModel 700 triple-beam balance sensitive accurate rather expensive Below Har land Indoor-model balance commercially available scale indoor very fine product rocket-size postal scale purchased trom local post office cheap handy Small size tendency oscillate limit its accuracy oroductroviewp8oductrevewproducteuiewpoduc,0vjew Above Hamilton Postal Scale several capacities available Inexpensive convenient limited accuracy suitable modeling Below Stylus Pressure Gage phonograph tone arms Cheap convenient requires recall bration useful Carry tool box
Edition: Model Aviation - 1975/09
Page Numbers: 22, 23, 70
Free Flight Duration Free Flights Top Ten National Free Flight Society announces recipients its ten Free Flight Model Year awards 1975 pole position receiving second such NFFS award Bill Bob Hunter greatest spectacle free flight Satel lite 226 Check new GLH series predict will due another NFFS award along about 1977 Big Red Johnson gets nod Tarter 800 highly successful Southern Cal competition FAI Power award goes US team member nor World Champs winner guy stuck con cept knew right Bill Gieskieng flapped-wing concept exemplified Siren-Dippity Wakefield have John Gard received award Out standing long-motor-run still-air machine Roger Jean Louis Garrigou France Coupe dHiver phenomenon began receive well-deserved recognition successful popular Garricoupe won 1973 Nats among other things could NFFS fail recognize longest officially recorded indoor flight ever Erv Rod emsky got second NFFS award aptly named 600 sq Monster has posted flight 45 mm 50 sec Steve Geraghty developed crummy looking little mite hand-launch glider anyone can build couple hours win contests named Driftwould NFFS doesnt have award guy has come closest winning Mul vihill Trophy often never quite got together instead gave George Perryman award design Little Daddy won Mulvihill hands another Don Chancey collected second NFFS award Canned Heat rocket-power model number ten award went Hans Seelig Seelig Multi-Function Timer 22 Model Aviation Bob Meuser has dominated field cutting engine power wiggling tails FAI-Power models world wide years Now could get price down Bob Stalick head committee 15 plus dozen consultants made selec tions promises construction drawings of models will available through NFFS Plans Service usual addition stories three-views will appear NFFS Sympo report complete list plans including Model Year awardees previous years write Larry Jordan 5641 Diamond Heights Blvd San Francisco CA 94131 Cathexis Airroil August issue men tioned unusual airfoil used Dave Par sons Cathexis FAI-Power model air foil developed Hank Cole back Fifties Daves version didnt come out quite extreme hump leading edge Hanks story gave airfoil designation CP5408 translates 5% camber 40% chord 8% thickness 25% chord P stands power since airfoil designed 1957-1960 FAI Power models models noted exceptional glide However downdraft knocked off Power team guess air foil never became popular Anyway know Parsons tried recently has excellent results Several notable features airfoil its extremely blunt leading edge provides adequate turbulation flat front portion lower surface works well boxspar construction Also note droop nose ef fect camber line near leading edge Some people prefer sharper leading edge Power reduce drag during climb Reynolds-number range doubt could measure difference drag between blunt sharp leading edges airfoil derived family air foils conceived back 1942 1944 flying wings Air Trails 1944 Model Annual blunt-nosed sections obtained trans forming Davis airfoil formulas Air Trails May 1942 another dimension think means push through hole space-time continuum eh Hank formulas quite general simply give smooth curve continuous derivatives have know general shape airfoil want manipulate equations produce such shape particular seems work first contacted Dave about airfoil suggested perhaps would prefer sit information awhile before publishing would have chance reap benefits fear competition response No publish Whatever success have due willingness other modelers give information might help wouldnt fair didnt same So Advanced copies sent members US FAI Power Team incidentally Electric Propulsion dont intend plugging electric propulsion month things keep happening think might like know about latest happening new system introduced recently VL Products 7023-D Canoga Ave Canoga Park CA 91303 heart system Hytork 48 geared motor motor Mabuchi RE-26 same size used Mattel Monogram units guts may may same Im quite ready ruin find out gear reducer leg up anything have seen model propulsion planetary gear set Planetary gearing has several advantages over conventional gearing symmet rical construction eliminates side force front motor bearing large source fric tion second advantage compactness prop shaft line motor shaft gearing adds little overall size motor Gear ratio 48about same original Super Star unitsand prop fur nished familiar Mattel prop Four batteries available using Ni-Cd cells first three batteries consist two three four cells same size used Mattel unit fourth battery consists three AA size penlight cells designated multi-motor models battery single motor duration powered flight would around three minutes might just thing schoolyard singlechannel R/C models Coupe dHiver international class rubber-power model built kit R/N Products ideal first step toward Wakefield international event flown World Champs Competition CP5408 ar hwx CoLe X 0 /2525 5 75 /0/5202530405060706090/00 U 074 * 3 6o 66 7883 6y90 68 &z Z 6i 46 2910 2 0-062 -075 -v6 -o4 -03 00 0609 1 14 12 10 cA 050 small two-cell pack performance modest weight low making fine scale sport models around 30-inch wing span three-cell battery gives flashier per formance sufficient power ruggedly built scale models about 36-in wingspan Duration powered flight 30 45 seconds four-cell battery performance astounding Vertical take-offs possible pro vided airframe weight equal less propulsion system weight have built ade quately rugged electric free-flight models airframe weights between half third propulsion system weight clear performance potential ap proaching gas powered models Hal Cover has four-cell unit rebuilt Coupe d Hiver model have recently installed mini-oldtimer intended 020 Cox engine Strato Streak built Cal Aeros fine kits All-up weight including convenient unnecessary Tatone timer 57 oz Both models VTO nicely Lots nice engineering has gone VL system example rather use com mercial switch charging jack VL developed its own lightweight unit serves both func tions cleverly contrived go switch cannot turned charging plug plugged nor can charger plugged switch connec tions made push-em-together connectors charging units incorporate place wind up cord VL peddles variety chargers do-it-yourself artist maddening array meters timers like example motorcycle battery VL used charging Ni-Cd flight batssells less half price local cycle shop slightly modified Mattel-type prop goes mere 60 should interest rubber-power speed scale sport fliers too instruction booklets catalog exceptionally clear complete know exactly what get money make function properly Send catalog find Out yourself New Coupe Kit dont intend make column solely new products review sort thing much hassle free flight knowing buy things often available mill-run hobby shops So cottage industry types crank out various nifty goodies free flight will keep formed Ill give free plug now again get point can afford classy ads wont able help much mentioned Coupe de Villea Coupe d Hiver class model also doubles Un limited Rubber modelin July column July 1973 issue American Aircraft Modeler mentions Tyro-Combo also two-event rubber model best knowledge Coupe kits going until trumpet fanfares Slats introduced R/N Products formerly Peterson Products P0 Box 2527 Lancaster CA 93534 also peddle number free-flight scale sport models rubber power 01 05 engines dont drop line Book Review Aero Modeller Annual 1974197S Annual general model avia tion publication enough free-flight material satisfy avid specialist three-view drawings three 1973 World Champ models plus 20 other free flight models articles airfoils peanut scale model tracking device bubble machine Coupe models make fast-burning fuse vari able incidence tails rubber-power models among others three-views include world champions international contest winners record setters aplenty will appeal sport flyer too articles run head-in-the-clouds theoretical down-to-earth practical much free flight material might ask what RC CL modelers Mind complaining Weighing scales frontispiece V E Johnsons 1910 book Model Aeroplaning engraving weighing balance caption reads important tool build ing model aeroplanes Some things never change Most accurate two-pan balance its inconvenience operation virtually rules out purposes Much convenient triple-arm balance Ohaus Model 700 has no competitors Sliding weights cover range up 610 grams added weights extend up 2610 grams roughly 6 lb smallest increment sliding weight 1/10 gram balance actually sensitive accurate about amount throughout its entire range Some balances price tag $49 plus $1 range-extending weights similar model calibrated pounds ounces available higher cost latest models feature magnetic damping indoor modeling / 10-gram sensitivity far too coarse satisfactory commer cially available scale am aware manufactured Ray Harlan 15 Happy Hol low Rd Wayland Mass 01778 Both metric blimey English versions available metric weighs 14 grams gradu ations 005 grams English goes 005 oz steps 00002 oz precision device having metal beam hardened steel knife edges resting agate V-blocks mag netic damping Price $30 plus postage Juggling sliding weight back forth until balance obtained can time-consum continued page 70 September 1975 23 lompIete ready-to-install electric propulsion system VL Products Battery having two three four cells can used depending power requirements Meuser Photo Right Hal Cover VTOs Coupe dHiver-size model powered VI Products unit Meuser Photo Below Desouter Monoplane Bill Warner has VI electric system natural scale models about 36 span Design E Fillon mid-thirties Wakefield winner fRill Warner Photo FF Duration continued page 23 ing nuisance convenience direct reading scale tops two types em ploying swinging weights employing springs Details engineering work manship important inherent difference between two types smaller ones selling $5 $15 pretty fair maximum range 8 oz 2 lb ones sold stationery stores postal scales diffi culty postal scales gradu ated steps e take trouble add intermediate graduationsor perhaps gram scale toothey much useful Typically accuracy about 2 percent midscale reading Handiest small enough carry toolbox least accurate little handheld direct reading scales local post office will sell weighs up 4 oz $210 Mid-scale accuracy about 5 percent accuracy top end much worse calibrations extremely non-linearcrowded near top endbut has its advantages sensitivity good lower end scale can get least approximate measure heavier weights better Similar scales sensitive sold proper hi-fl component shops stylus pressure gages Accuracy might poor check its calibrations re-calibrate it might quite satisfactory Sensitivity lower end typically /8 gram have calibrated infinity goes past infinity mark load 20 grams What look large total scale length 6-in-diameter dial three times good 6-in straight scale Sensitivity far does indicator move ounce gram Exces sive sensitivity however can sometimes nuisance Calibration accuracy accurately calibration marks placed Difficult check store Freedom friction weight pan push weight down slightly release gradually note reading push weight up slightly release gradually again note reading readings noticeably different dont buy Ruggedness durability convenience size appearance may may important Above importance suitability weighing kinds model parts use frequently address 4200 Gregory St Oakland Ca 94619 Whoopee Perunagloss Coverite finally Super tough woven fabric Requires no paint because already has 4 coats no-scratch paint bonded its upper surface Contains Quik-Stik miracle iron-on adhesive Will tear scratch pucker crack peel sag Waterproof fuelproof & fadeproof COVERITE 112 Chestnut Street Phila Pa 19106 Rubber Lube Made formula liobert Taylor contest use several years lube does contain castor oil can deteriorate rubber rubbed rubber obtain turns produce thrust handy 3 oz squeeze bottle sells $149 Peck-Polymers PO Box 2498 La Mesa Calif 92041 producneviewproductreviewproduc,evgewpodu0tr0vjew 70 Model Aviation Above OhausModel 700 triple-beam balance sensitive accurate rather expensive Below Har land Indoor-model balance commercially available scale indoor very fine product rocket-size postal scale purchased trom local post office cheap handy Small size tendency oscillate limit its accuracy oroductroviewp8oductrevewproducteuiewpoduc,0vjew Above Hamilton Postal Scale several capacities available Inexpensive convenient limited accuracy suitable modeling Below Stylus Pressure Gage phonograph tone arms Cheap convenient requires recall bration useful Carry tool box