Take away transmitter top scene could out pastcomplete hurtling fences climbing trees sne TUfl day Authors time machine antique spark-ignition Hurleman Aristocrat 50-powered Clipper plane designed Carl Gold berg kitted Comet 1938Hurleman engine sametime period combo rudder elevator engine shutoff controls didnt need shielded ignition Hurleman Aristocrat constantly mistaken Brown Jrboth common ancestry Engine operates 4500 6500 rpm range depending prop Old medium-pitch Flo-Torque 14-incher shown Top Flite 14-6 also does nicely Vertical lever front cylinder adjusts spark timing Author uses standard 31 gas/oil fuel mixprefers Klots oil SAE 70 keeping engine clean cLLIrNE E1ACFifl WHEN IT COMES Old-Timers must admit being something purist Watching rocket skyward behind screaming glowplug engines just doesnt turn Ever since acquiring few old spark-ignition engines some years ago Id always dreamed someday seeing two actually haul vintage model air ignition-powered Clipper result dream Im enough purist risk loss old sparker four winds true Free Flight ship however Thus Clipper radiocontrolled gives least some assurance getting back flight piece order preserve much antique flavor plane possible Ive tried conceal RC part receiver antenna hidden inside fuselage example youre really sharp-eyed youll note absence unsightly shielding around spark plug its high-tension lead fact things find myself explain ing often other OT modelers Ive able dispense heavy bulky often troublesome shielding nearly everyone seems think necessary flying old ignition engines RC Like other modelers whove attempted fly ignition RC originally assumed thatthe static generated spark engine would inferfere grossly radio Id read some OT fliers getting around problem shield ing ignition systemsenclosing coil con denser batteries metal box grounded engine coaxial cable inner conduc tors served high- low-tension leads spark plug timer An better approach seemed combination shielding electronic ignition being flown few guys Somehow transistor izing ignition circuit generated hotter spark minimized radio interferenceor theory went obtained plans such system few nights finished brass box Id fabri 22 Model Aviation fans Old-Timer models theres no thing very unusual about Comet Clipper Its popularity rivals plane period things makes particular Clipper dif ferent old longstroke spark-ignition 60 swinging 14-in propand Clipper radio-controlled Flying combo old new like traveling back time Dave Ritchie cated heavy shoe-horn fit relatively spacious nose first Old-Timer plane six-foot Cavalier Standard powered Ohlsson 60 Unfortunately system proved total fail ure produced no half dozen sparks before somethingI dont know whatblew out Being no electronics expert couldnt fix So junked favor another transistorized ignition built friend make long story short system worked no better first sheer frustration yanked brass box out Cavalier installed old Smith coil condenser pair C-size alkaline cells same setup Id used benchtesting engines confident its ability V Authors parts operating spark-ignition engine RC planewith penny judging relative sizes left 12K-ohm Y2-watt resistor ignition noise suppression closed-circuit jack jack plug micro-switch booster engine shutoff circuits various capacitors cluding top bottom 22 mFd-200V 01 mFd-400V 01 mFd-250V 01 mFd-250V 01 mFd-600V two types Smith coils have successfully flown produce good hot spark micro switch operated servo retract channel radio served shutoff None gear shielded simply curious see would affect radio t backyard bit testing transmitter maximum ground range antenna removed fully expected radio go bananas moment engine started great surprise didnt As Ohlsson roared life servos exhibited slight constant utteringmore like vibration anything else followed control inputs rea sonably well kill switch retract channel shut engine down moment thrown Progress last remembered instructions transistorized ignitions advised installing 10K resistor high-tension lead radio interference could noticed worked February 1981 23 Ii electronic ignition would work simple coil/condenser setup few minutes resistor lead connected went through same test procedure before time jitters gone elevator rudder servos shutoff servo twitched intermittently Because servo channel jumps occasionally whether something bothering radio figured interfer ence licked Cavalier Standard crude first attempt six pounds terribly overweight run p[lIVIUUIlIly ~1ILllIldIl lvii VVdILI Hurleman Jr now 68 20 years old fathers machine shop turned out first productino batch Brown Jr gaso line model airplane engines de signed course Bill Brown time 1931-32 less appren tice Walter Hurleman Sr Walt Jr Reds known also worked shop charge among other things carving 14-in propellers engines jig made himself Hurleman Aristocrat 60 direct early days entered development original sandcast-crank- contest against Bassetts Miss Philly II case A-model Browns Max March 1933 Bassett won course Bassett flew 4th place 1932 marginally airworthyowing definite short age fin/rudder area However flew well enough prove workability ignition/ radio combination discovered quite accident second effort chose Clippermore its pleasing lines anything else choice however necessitated morc compact ignition installation Substituting pencells C-cells used earlier able crowd ignition components onto bottom motor mount Instead Continued page 104 24 Model Aviation Spark ignition system under engine cabin clear radio installation Pushr.. ard shutoff switch contacts switch arm during last 1/5-Ifl travel Rod should adjusted no load imposed servo off forward position Top Beneath motor bearer connections closed-circuit booster jack similar spot other side ignition shutoff micro-switch Note leads spark plug timer engine ground connection right rear engine mount bolt primarywiring 18-gauge automotive Middle Attached bottom motor mount WilcocoilO1 mFdcapacitorandAcmebattery holder alkaline pencells Above Its easy see engine attached thatthe mount/ ignition unit very compact efficient Hurleman 48 engine shown MLIdIILII LIty II waa oulli mu original tooling wfllcfl Hurleman Sr retained after Brown split him late 1933 start own engine manufacturing concern Junior Motors Corporation photo taken during series evening demonstration flights made H urle man past summer having seen gas model fly since mid-30s im pressed capabilities modern RC nostalgic sound old engine Hurleman built gas model two himself TWENTY- SEVENTH ANNUAL OLLDO RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 1011 121981 FRIDAY SATURDAY SUNDAY 9 am 6 9 am 6 9am 430 pm pm pm presented WEAK SIGNALS po box 5772 R/C CLUB toledo ohio 43613 4. ..... ___ Radio Technique/Myers Continued page 21 subject hasnt covered satisfac tion let know baseline get paid writing column research testing comes result interest subject expenses come out pocket dont have interest subject pre disposes spend money isnt much chance Ill write about try month entertaining informative above accurate profession man agement Structural Test Engineering motto Get right information purpose carries over column too George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Time Machine/Ritchie Continued page 24 Smith coil used Wilco unit Its lugs provide easy method attachment well primary electrical connections Its fiber shell also oil proof though Hot-Stuffed end covers just make sure added miniature closed-circuit jack engine could started run booster bat teries independent pencells position shutoff switch Its wired booster plug interrupts circuit pencells dummy jack plug can inserted socket deactivate entire system extreme forward mounting ignition has number advantages helps balance ship allows maximum distance between placement coil receiver short length wiring necessary reach timer spark plug probably contributes reliable operation both engine radio tunately everything fits neatly beneath Clip per s nose cowl date ship has accumulated over 300 flights number different power plants various model Brown Jr Hurleman engines small collection Ive played around some different condensers capacitors prefer Just about anything between 01 01 mFd 250 600v will work electrical values dont seem too critical like best 01 mFd 400vsame originally supplied Brown Jr Most caps range polarized attention must paid plusses minuses hooking up Also caps small physical size dont last long Ive flown two different Wilco coils RUBBER STRIP FAI RUBBER 4 out 5 flyoff 1979 World Championships used FAI RUBBER Made USA SIZES % 3/16 1/8 3/32 1/16 1mm 042 thick SPOOLED GROSS WT 1% 1- LBS PRICE $1250 first spool PPD US Additional spools $1250 NEW PIRELLI SIZES 6mm 5mm 4mm X 1mm PRICE $1500 first hank PPD US Additional spools $1450 Sole US Distributor World-Wide Sales Send 25 cents 1980 Catalog ____ FAI Model Supply P0 Box 3957 Torrance CA 90510 Smith Competitor coil addition Smith Firecracker used Cavalier work about same As far spark lead resistor concerned theres no noticeable difference between 10K 12K would imagine resistance could increased until begins affect engine performance boosterbattery setup have pencell life quite good Ive replaced perhaps three four times radio may may impor tant part equation flying spark-ignition engines RC Mine five-year-old World Engines Expert Mark 7-channel 75640 MHz Ive used Worlds S-Il servos well Novak Bantam Midgets equal success Clipper 250 mAh flight battery entirely adequate full days flying Undoubtedly some makes radios maybe some individual radios same make probably susceptible ignition interference others Kraft radios particular seem have bad reputation regard yet Jack Van Dusen has flying dual-conversion Kraft receiver along really hot unshielded electronic ignition Dallaire Sportster re cently Jack way has 10K resistor spark lead too maybe thats ticket Clearly work needs done suspect spark-ignition engines probably flyable RC modelers thinkand having hire electrical engineer dream up fancy ignition system Word needs passed around what works what doesnt have old sparker youd like fly afraid losing Free Flight try RC RC Giant Scale/Beckman Continued page 27 Hostetlers super scale plans first heard Wendell Hostetler several years ago blew up Sig Skybolt Quarter Scale size Skybolt still going strong lot people have built own Wendells plans has added plans Liberty Sport Bucker Jungmeister comment below following appears instruction manual Liberty Sport very interesting note ages purchased plans first project Skybolt Almost excep tion over 40 has changed approach towards what should should included instructional manual thought beginners less experience would go Giant Scale route included Continued page 108 104 Model Aviation PLANS & CONSTR MANUAL Curtis s Hawk P6E Stinson Reliant SR9 2/4SCALE 94 ASP 52250 1/4SCALE i2BSP $2500 aSCALE 63SPAN $1250 SCALE ROSPAN 51500 IjSCALE 475/a SSi05O 25 SCALE 62 SPAN 51250 Curtiss FIIC2 Curtiss Gulfhawk IA iASCALE 545SP $3000 i/4SCALE 94SSP *3000 2SCALE 62SP $1500 2SCALE B3SP $1500 PLEASE ADD *200 FORP/N USASEND *100 WRITE FOR MAILING INFORMATION GAlA LOGE INCLUDE $100 FOR CATA LOGE 1213 HOLLY SPRING LANE GRAND BLANC MI 48439
Edition: Model Aviation - 1981/02
Page Numbers: 22, 23, 24, 104
Take away transmitter top scene could out pastcomplete hurtling fences climbing trees sne TUfl day Authors time machine antique spark-ignition Hurleman Aristocrat 50-powered Clipper plane designed Carl Gold berg kitted Comet 1938Hurleman engine sametime period combo rudder elevator engine shutoff controls didnt need shielded ignition Hurleman Aristocrat constantly mistaken Brown Jrboth common ancestry Engine operates 4500 6500 rpm range depending prop Old medium-pitch Flo-Torque 14-incher shown Top Flite 14-6 also does nicely Vertical lever front cylinder adjusts spark timing Author uses standard 31 gas/oil fuel mixprefers Klots oil SAE 70 keeping engine clean cLLIrNE E1ACFifl WHEN IT COMES Old-Timers must admit being something purist Watching rocket skyward behind screaming glowplug engines just doesnt turn Ever since acquiring few old spark-ignition engines some years ago Id always dreamed someday seeing two actually haul vintage model air ignition-powered Clipper result dream Im enough purist risk loss old sparker four winds true Free Flight ship however Thus Clipper radiocontrolled gives least some assurance getting back flight piece order preserve much antique flavor plane possible Ive tried conceal RC part receiver antenna hidden inside fuselage example youre really sharp-eyed youll note absence unsightly shielding around spark plug its high-tension lead fact things find myself explain ing often other OT modelers Ive able dispense heavy bulky often troublesome shielding nearly everyone seems think necessary flying old ignition engines RC Like other modelers whove attempted fly ignition RC originally assumed thatthe static generated spark engine would inferfere grossly radio Id read some OT fliers getting around problem shield ing ignition systemsenclosing coil con denser batteries metal box grounded engine coaxial cable inner conduc tors served high- low-tension leads spark plug timer An better approach seemed combination shielding electronic ignition being flown few guys Somehow transistor izing ignition circuit generated hotter spark minimized radio interferenceor theory went obtained plans such system few nights finished brass box Id fabri 22 Model Aviation fans Old-Timer models theres no thing very unusual about Comet Clipper Its popularity rivals plane period things makes particular Clipper dif ferent old longstroke spark-ignition 60 swinging 14-in propand Clipper radio-controlled Flying combo old new like traveling back time Dave Ritchie cated heavy shoe-horn fit relatively spacious nose first Old-Timer plane six-foot Cavalier Standard powered Ohlsson 60 Unfortunately system proved total fail ure produced no half dozen sparks before somethingI dont know whatblew out Being no electronics expert couldnt fix So junked favor another transistorized ignition built friend make long story short system worked no better first sheer frustration yanked brass box out Cavalier installed old Smith coil condenser pair C-size alkaline cells same setup Id used benchtesting engines confident its ability V Authors parts operating spark-ignition engine RC planewith penny judging relative sizes left 12K-ohm Y2-watt resistor ignition noise suppression closed-circuit jack jack plug micro-switch booster engine shutoff circuits various capacitors cluding top bottom 22 mFd-200V 01 mFd-400V 01 mFd-250V 01 mFd-250V 01 mFd-600V two types Smith coils have successfully flown produce good hot spark micro switch operated servo retract channel radio served shutoff None gear shielded simply curious see would affect radio t backyard bit testing transmitter maximum ground range antenna removed fully expected radio go bananas moment engine started great surprise didnt As Ohlsson roared life servos exhibited slight constant utteringmore like vibration anything else followed control inputs rea sonably well kill switch retract channel shut engine down moment thrown Progress last remembered instructions transistorized ignitions advised installing 10K resistor high-tension lead radio interference could noticed worked February 1981 23 Ii electronic ignition would work simple coil/condenser setup few minutes resistor lead connected went through same test procedure before time jitters gone elevator rudder servos shutoff servo twitched intermittently Because servo channel jumps occasionally whether something bothering radio figured interfer ence licked Cavalier Standard crude first attempt six pounds terribly overweight run p[lIVIUUIlIly ~1ILllIldIl lvii VVdILI Hurleman Jr now 68 20 years old fathers machine shop turned out first productino batch Brown Jr gaso line model airplane engines de signed course Bill Brown time 1931-32 less appren tice Walter Hurleman Sr Walt Jr Reds known also worked shop charge among other things carving 14-in propellers engines jig made himself Hurleman Aristocrat 60 direct early days entered development original sandcast-crank- contest against Bassetts Miss Philly II case A-model Browns Max March 1933 Bassett won course Bassett flew 4th place 1932 marginally airworthyowing definite short age fin/rudder area However flew well enough prove workability ignition/ radio combination discovered quite accident second effort chose Clippermore its pleasing lines anything else choice however necessitated morc compact ignition installation Substituting pencells C-cells used earlier able crowd ignition components onto bottom motor mount Instead Continued page 104 24 Model Aviation Spark ignition system under engine cabin clear radio installation Pushr.. ard shutoff switch contacts switch arm during last 1/5-Ifl travel Rod should adjusted no load imposed servo off forward position Top Beneath motor bearer connections closed-circuit booster jack similar spot other side ignition shutoff micro-switch Note leads spark plug timer engine ground connection right rear engine mount bolt primarywiring 18-gauge automotive Middle Attached bottom motor mount WilcocoilO1 mFdcapacitorandAcmebattery holder alkaline pencells Above Its easy see engine attached thatthe mount/ ignition unit very compact efficient Hurleman 48 engine shown MLIdIILII LIty II waa oulli mu original tooling wfllcfl Hurleman Sr retained after Brown split him late 1933 start own engine manufacturing concern Junior Motors Corporation photo taken during series evening demonstration flights made H urle man past summer having seen gas model fly since mid-30s im pressed capabilities modern RC nostalgic sound old engine Hurleman built gas model two himself TWENTY- SEVENTH ANNUAL OLLDO RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 1011 121981 FRIDAY SATURDAY SUNDAY 9 am 6 9 am 6 9am 430 pm pm pm presented WEAK SIGNALS po box 5772 R/C CLUB toledo ohio 43613 4. ..... ___ Radio Technique/Myers Continued page 21 subject hasnt covered satisfac tion let know baseline get paid writing column research testing comes result interest subject expenses come out pocket dont have interest subject pre disposes spend money isnt much chance Ill write about try month entertaining informative above accurate profession man agement Structural Test Engineering motto Get right information purpose carries over column too George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Time Machine/Ritchie Continued page 24 Smith coil used Wilco unit Its lugs provide easy method attachment well primary electrical connections Its fiber shell also oil proof though Hot-Stuffed end covers just make sure added miniature closed-circuit jack engine could started run booster bat teries independent pencells position shutoff switch Its wired booster plug interrupts circuit pencells dummy jack plug can inserted socket deactivate entire system extreme forward mounting ignition has number advantages helps balance ship allows maximum distance between placement coil receiver short length wiring necessary reach timer spark plug probably contributes reliable operation both engine radio tunately everything fits neatly beneath Clip per s nose cowl date ship has accumulated over 300 flights number different power plants various model Brown Jr Hurleman engines small collection Ive played around some different condensers capacitors prefer Just about anything between 01 01 mFd 250 600v will work electrical values dont seem too critical like best 01 mFd 400vsame originally supplied Brown Jr Most caps range polarized attention must paid plusses minuses hooking up Also caps small physical size dont last long Ive flown two different Wilco coils RUBBER STRIP FAI RUBBER 4 out 5 flyoff 1979 World Championships used FAI RUBBER Made USA SIZES % 3/16 1/8 3/32 1/16 1mm 042 thick SPOOLED GROSS WT 1% 1- LBS PRICE $1250 first spool PPD US Additional spools $1250 NEW PIRELLI SIZES 6mm 5mm 4mm X 1mm PRICE $1500 first hank PPD US Additional spools $1450 Sole US Distributor World-Wide Sales Send 25 cents 1980 Catalog ____ FAI Model Supply P0 Box 3957 Torrance CA 90510 Smith Competitor coil addition Smith Firecracker used Cavalier work about same As far spark lead resistor concerned theres no noticeable difference between 10K 12K would imagine resistance could increased until begins affect engine performance boosterbattery setup have pencell life quite good Ive replaced perhaps three four times radio may may impor tant part equation flying spark-ignition engines RC Mine five-year-old World Engines Expert Mark 7-channel 75640 MHz Ive used Worlds S-Il servos well Novak Bantam Midgets equal success Clipper 250 mAh flight battery entirely adequate full days flying Undoubtedly some makes radios maybe some individual radios same make probably susceptible ignition interference others Kraft radios particular seem have bad reputation regard yet Jack Van Dusen has flying dual-conversion Kraft receiver along really hot unshielded electronic ignition Dallaire Sportster re cently Jack way has 10K resistor spark lead too maybe thats ticket Clearly work needs done suspect spark-ignition engines probably flyable RC modelers thinkand having hire electrical engineer dream up fancy ignition system Word needs passed around what works what doesnt have old sparker youd like fly afraid losing Free Flight try RC RC Giant Scale/Beckman Continued page 27 Hostetlers super scale plans first heard Wendell Hostetler several years ago blew up Sig Skybolt Quarter Scale size Skybolt still going strong lot people have built own Wendells plans has added plans Liberty Sport Bucker Jungmeister comment below following appears instruction manual Liberty Sport very interesting note ages purchased plans first project Skybolt Almost excep tion over 40 has changed approach towards what should should included instructional manual thought beginners less experience would go Giant Scale route included Continued page 108 104 Model Aviation PLANS & CONSTR MANUAL Curtis s Hawk P6E Stinson Reliant SR9 2/4SCALE 94 ASP 52250 1/4SCALE i2BSP $2500 aSCALE 63SPAN $1250 SCALE ROSPAN 51500 IjSCALE 475/a SSi05O 25 SCALE 62 SPAN 51250 Curtiss FIIC2 Curtiss Gulfhawk IA iASCALE 545SP $3000 i/4SCALE 94SSP *3000 2SCALE 62SP $1500 2SCALE B3SP $1500 PLEASE ADD *200 FORP/N USASEND *100 WRITE FOR MAILING INFORMATION GAlA LOGE INCLUDE $100 FOR CATA LOGE 1213 HOLLY SPRING LANE GRAND BLANC MI 48439
Edition: Model Aviation - 1981/02
Page Numbers: 22, 23, 24, 104
Take away transmitter top scene could out pastcomplete hurtling fences climbing trees sne TUfl day Authors time machine antique spark-ignition Hurleman Aristocrat 50-powered Clipper plane designed Carl Gold berg kitted Comet 1938Hurleman engine sametime period combo rudder elevator engine shutoff controls didnt need shielded ignition Hurleman Aristocrat constantly mistaken Brown Jrboth common ancestry Engine operates 4500 6500 rpm range depending prop Old medium-pitch Flo-Torque 14-incher shown Top Flite 14-6 also does nicely Vertical lever front cylinder adjusts spark timing Author uses standard 31 gas/oil fuel mixprefers Klots oil SAE 70 keeping engine clean cLLIrNE E1ACFifl WHEN IT COMES Old-Timers must admit being something purist Watching rocket skyward behind screaming glowplug engines just doesnt turn Ever since acquiring few old spark-ignition engines some years ago Id always dreamed someday seeing two actually haul vintage model air ignition-powered Clipper result dream Im enough purist risk loss old sparker four winds true Free Flight ship however Thus Clipper radiocontrolled gives least some assurance getting back flight piece order preserve much antique flavor plane possible Ive tried conceal RC part receiver antenna hidden inside fuselage example youre really sharp-eyed youll note absence unsightly shielding around spark plug its high-tension lead fact things find myself explain ing often other OT modelers Ive able dispense heavy bulky often troublesome shielding nearly everyone seems think necessary flying old ignition engines RC Like other modelers whove attempted fly ignition RC originally assumed thatthe static generated spark engine would inferfere grossly radio Id read some OT fliers getting around problem shield ing ignition systemsenclosing coil con denser batteries metal box grounded engine coaxial cable inner conduc tors served high- low-tension leads spark plug timer An better approach seemed combination shielding electronic ignition being flown few guys Somehow transistor izing ignition circuit generated hotter spark minimized radio interferenceor theory went obtained plans such system few nights finished brass box Id fabri 22 Model Aviation fans Old-Timer models theres no thing very unusual about Comet Clipper Its popularity rivals plane period things makes particular Clipper dif ferent old longstroke spark-ignition 60 swinging 14-in propand Clipper radio-controlled Flying combo old new like traveling back time Dave Ritchie cated heavy shoe-horn fit relatively spacious nose first Old-Timer plane six-foot Cavalier Standard powered Ohlsson 60 Unfortunately system proved total fail ure produced no half dozen sparks before somethingI dont know whatblew out Being no electronics expert couldnt fix So junked favor another transistorized ignition built friend make long story short system worked no better first sheer frustration yanked brass box out Cavalier installed old Smith coil condenser pair C-size alkaline cells same setup Id used benchtesting engines confident its ability V Authors parts operating spark-ignition engine RC planewith penny judging relative sizes left 12K-ohm Y2-watt resistor ignition noise suppression closed-circuit jack jack plug micro-switch booster engine shutoff circuits various capacitors cluding top bottom 22 mFd-200V 01 mFd-400V 01 mFd-250V 01 mFd-250V 01 mFd-600V two types Smith coils have successfully flown produce good hot spark micro switch operated servo retract channel radio served shutoff None gear shielded simply curious see would affect radio t backyard bit testing transmitter maximum ground range antenna removed fully expected radio go bananas moment engine started great surprise didnt As Ohlsson roared life servos exhibited slight constant utteringmore like vibration anything else followed control inputs rea sonably well kill switch retract channel shut engine down moment thrown Progress last remembered instructions transistorized ignitions advised installing 10K resistor high-tension lead radio interference could noticed worked February 1981 23 Ii electronic ignition would work simple coil/condenser setup few minutes resistor lead connected went through same test procedure before time jitters gone elevator rudder servos shutoff servo twitched intermittently Because servo channel jumps occasionally whether something bothering radio figured interfer ence licked Cavalier Standard crude first attempt six pounds terribly overweight run p[lIVIUUIlIly ~1ILllIldIl lvii VVdILI Hurleman Jr now 68 20 years old fathers machine shop turned out first productino batch Brown Jr gaso line model airplane engines de signed course Bill Brown time 1931-32 less appren tice Walter Hurleman Sr Walt Jr Reds known also worked shop charge among other things carving 14-in propellers engines jig made himself Hurleman Aristocrat 60 direct early days entered development original sandcast-crank- contest against Bassetts Miss Philly II case A-model Browns Max March 1933 Bassett won course Bassett flew 4th place 1932 marginally airworthyowing definite short age fin/rudder area However flew well enough prove workability ignition/ radio combination discovered quite accident second effort chose Clippermore its pleasing lines anything else choice however necessitated morc compact ignition installation Substituting pencells C-cells used earlier able crowd ignition components onto bottom motor mount Instead Continued page 104 24 Model Aviation Spark ignition system under engine cabin clear radio installation Pushr.. ard shutoff switch contacts switch arm during last 1/5-Ifl travel Rod should adjusted no load imposed servo off forward position Top Beneath motor bearer connections closed-circuit booster jack similar spot other side ignition shutoff micro-switch Note leads spark plug timer engine ground connection right rear engine mount bolt primarywiring 18-gauge automotive Middle Attached bottom motor mount WilcocoilO1 mFdcapacitorandAcmebattery holder alkaline pencells Above Its easy see engine attached thatthe mount/ ignition unit very compact efficient Hurleman 48 engine shown MLIdIILII LIty II waa oulli mu original tooling wfllcfl Hurleman Sr retained after Brown split him late 1933 start own engine manufacturing concern Junior Motors Corporation photo taken during series evening demonstration flights made H urle man past summer having seen gas model fly since mid-30s im pressed capabilities modern RC nostalgic sound old engine Hurleman built gas model two himself TWENTY- SEVENTH ANNUAL OLLDO RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 1011 121981 FRIDAY SATURDAY SUNDAY 9 am 6 9 am 6 9am 430 pm pm pm presented WEAK SIGNALS po box 5772 R/C CLUB toledo ohio 43613 4. ..... ___ Radio Technique/Myers Continued page 21 subject hasnt covered satisfac tion let know baseline get paid writing column research testing comes result interest subject expenses come out pocket dont have interest subject pre disposes spend money isnt much chance Ill write about try month entertaining informative above accurate profession man agement Structural Test Engineering motto Get right information purpose carries over column too George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Time Machine/Ritchie Continued page 24 Smith coil used Wilco unit Its lugs provide easy method attachment well primary electrical connections Its fiber shell also oil proof though Hot-Stuffed end covers just make sure added miniature closed-circuit jack engine could started run booster bat teries independent pencells position shutoff switch Its wired booster plug interrupts circuit pencells dummy jack plug can inserted socket deactivate entire system extreme forward mounting ignition has number advantages helps balance ship allows maximum distance between placement coil receiver short length wiring necessary reach timer spark plug probably contributes reliable operation both engine radio tunately everything fits neatly beneath Clip per s nose cowl date ship has accumulated over 300 flights number different power plants various model Brown Jr Hurleman engines small collection Ive played around some different condensers capacitors prefer Just about anything between 01 01 mFd 250 600v will work electrical values dont seem too critical like best 01 mFd 400vsame originally supplied Brown Jr Most caps range polarized attention must paid plusses minuses hooking up Also caps small physical size dont last long Ive flown two different Wilco coils RUBBER STRIP FAI RUBBER 4 out 5 flyoff 1979 World Championships used FAI RUBBER Made USA SIZES % 3/16 1/8 3/32 1/16 1mm 042 thick SPOOLED GROSS WT 1% 1- LBS PRICE $1250 first spool PPD US Additional spools $1250 NEW PIRELLI SIZES 6mm 5mm 4mm X 1mm PRICE $1500 first hank PPD US Additional spools $1450 Sole US Distributor World-Wide Sales Send 25 cents 1980 Catalog ____ FAI Model Supply P0 Box 3957 Torrance CA 90510 Smith Competitor coil addition Smith Firecracker used Cavalier work about same As far spark lead resistor concerned theres no noticeable difference between 10K 12K would imagine resistance could increased until begins affect engine performance boosterbattery setup have pencell life quite good Ive replaced perhaps three four times radio may may impor tant part equation flying spark-ignition engines RC Mine five-year-old World Engines Expert Mark 7-channel 75640 MHz Ive used Worlds S-Il servos well Novak Bantam Midgets equal success Clipper 250 mAh flight battery entirely adequate full days flying Undoubtedly some makes radios maybe some individual radios same make probably susceptible ignition interference others Kraft radios particular seem have bad reputation regard yet Jack Van Dusen has flying dual-conversion Kraft receiver along really hot unshielded electronic ignition Dallaire Sportster re cently Jack way has 10K resistor spark lead too maybe thats ticket Clearly work needs done suspect spark-ignition engines probably flyable RC modelers thinkand having hire electrical engineer dream up fancy ignition system Word needs passed around what works what doesnt have old sparker youd like fly afraid losing Free Flight try RC RC Giant Scale/Beckman Continued page 27 Hostetlers super scale plans first heard Wendell Hostetler several years ago blew up Sig Skybolt Quarter Scale size Skybolt still going strong lot people have built own Wendells plans has added plans Liberty Sport Bucker Jungmeister comment below following appears instruction manual Liberty Sport very interesting note ages purchased plans first project Skybolt Almost excep tion over 40 has changed approach towards what should should included instructional manual thought beginners less experience would go Giant Scale route included Continued page 108 104 Model Aviation PLANS & CONSTR MANUAL Curtis s Hawk P6E Stinson Reliant SR9 2/4SCALE 94 ASP 52250 1/4SCALE i2BSP $2500 aSCALE 63SPAN $1250 SCALE ROSPAN 51500 IjSCALE 475/a SSi05O 25 SCALE 62 SPAN 51250 Curtiss FIIC2 Curtiss Gulfhawk IA iASCALE 545SP $3000 i/4SCALE 94SSP *3000 2SCALE 62SP $1500 2SCALE B3SP $1500 PLEASE ADD *200 FORP/N USASEND *100 WRITE FOR MAILING INFORMATION GAlA LOGE INCLUDE $100 FOR CATA LOGE 1213 HOLLY SPRING LANE GRAND BLANC MI 48439
Edition: Model Aviation - 1981/02
Page Numbers: 22, 23, 24, 104
Take away transmitter top scene could out pastcomplete hurtling fences climbing trees sne TUfl day Authors time machine antique spark-ignition Hurleman Aristocrat 50-powered Clipper plane designed Carl Gold berg kitted Comet 1938Hurleman engine sametime period combo rudder elevator engine shutoff controls didnt need shielded ignition Hurleman Aristocrat constantly mistaken Brown Jrboth common ancestry Engine operates 4500 6500 rpm range depending prop Old medium-pitch Flo-Torque 14-incher shown Top Flite 14-6 also does nicely Vertical lever front cylinder adjusts spark timing Author uses standard 31 gas/oil fuel mixprefers Klots oil SAE 70 keeping engine clean cLLIrNE E1ACFifl WHEN IT COMES Old-Timers must admit being something purist Watching rocket skyward behind screaming glowplug engines just doesnt turn Ever since acquiring few old spark-ignition engines some years ago Id always dreamed someday seeing two actually haul vintage model air ignition-powered Clipper result dream Im enough purist risk loss old sparker four winds true Free Flight ship however Thus Clipper radiocontrolled gives least some assurance getting back flight piece order preserve much antique flavor plane possible Ive tried conceal RC part receiver antenna hidden inside fuselage example youre really sharp-eyed youll note absence unsightly shielding around spark plug its high-tension lead fact things find myself explain ing often other OT modelers Ive able dispense heavy bulky often troublesome shielding nearly everyone seems think necessary flying old ignition engines RC Like other modelers whove attempted fly ignition RC originally assumed thatthe static generated spark engine would inferfere grossly radio Id read some OT fliers getting around problem shield ing ignition systemsenclosing coil con denser batteries metal box grounded engine coaxial cable inner conduc tors served high- low-tension leads spark plug timer An better approach seemed combination shielding electronic ignition being flown few guys Somehow transistor izing ignition circuit generated hotter spark minimized radio interferenceor theory went obtained plans such system few nights finished brass box Id fabri 22 Model Aviation fans Old-Timer models theres no thing very unusual about Comet Clipper Its popularity rivals plane period things makes particular Clipper dif ferent old longstroke spark-ignition 60 swinging 14-in propand Clipper radio-controlled Flying combo old new like traveling back time Dave Ritchie cated heavy shoe-horn fit relatively spacious nose first Old-Timer plane six-foot Cavalier Standard powered Ohlsson 60 Unfortunately system proved total fail ure produced no half dozen sparks before somethingI dont know whatblew out Being no electronics expert couldnt fix So junked favor another transistorized ignition built friend make long story short system worked no better first sheer frustration yanked brass box out Cavalier installed old Smith coil condenser pair C-size alkaline cells same setup Id used benchtesting engines confident its ability V Authors parts operating spark-ignition engine RC planewith penny judging relative sizes left 12K-ohm Y2-watt resistor ignition noise suppression closed-circuit jack jack plug micro-switch booster engine shutoff circuits various capacitors cluding top bottom 22 mFd-200V 01 mFd-400V 01 mFd-250V 01 mFd-250V 01 mFd-600V two types Smith coils have successfully flown produce good hot spark micro switch operated servo retract channel radio served shutoff None gear shielded simply curious see would affect radio t backyard bit testing transmitter maximum ground range antenna removed fully expected radio go bananas moment engine started great surprise didnt As Ohlsson roared life servos exhibited slight constant utteringmore like vibration anything else followed control inputs rea sonably well kill switch retract channel shut engine down moment thrown Progress last remembered instructions transistorized ignitions advised installing 10K resistor high-tension lead radio interference could noticed worked February 1981 23 Ii electronic ignition would work simple coil/condenser setup few minutes resistor lead connected went through same test procedure before time jitters gone elevator rudder servos shutoff servo twitched intermittently Because servo channel jumps occasionally whether something bothering radio figured interfer ence licked Cavalier Standard crude first attempt six pounds terribly overweight run p[lIVIUUIlIly ~1ILllIldIl lvii VVdILI Hurleman Jr now 68 20 years old fathers machine shop turned out first productino batch Brown Jr gaso line model airplane engines de signed course Bill Brown time 1931-32 less appren tice Walter Hurleman Sr Walt Jr Reds known also worked shop charge among other things carving 14-in propellers engines jig made himself Hurleman Aristocrat 60 direct early days entered development original sandcast-crank- contest against Bassetts Miss Philly II case A-model Browns Max March 1933 Bassett won course Bassett flew 4th place 1932 marginally airworthyowing definite short age fin/rudder area However flew well enough prove workability ignition/ radio combination discovered quite accident second effort chose Clippermore its pleasing lines anything else choice however necessitated morc compact ignition installation Substituting pencells C-cells used earlier able crowd ignition components onto bottom motor mount Instead Continued page 104 24 Model Aviation Spark ignition system under engine cabin clear radio installation Pushr.. ard shutoff switch contacts switch arm during last 1/5-Ifl travel Rod should adjusted no load imposed servo off forward position Top Beneath motor bearer connections closed-circuit booster jack similar spot other side ignition shutoff micro-switch Note leads spark plug timer engine ground connection right rear engine mount bolt primarywiring 18-gauge automotive Middle Attached bottom motor mount WilcocoilO1 mFdcapacitorandAcmebattery holder alkaline pencells Above Its easy see engine attached thatthe mount/ ignition unit very compact efficient Hurleman 48 engine shown MLIdIILII LIty II waa oulli mu original tooling wfllcfl Hurleman Sr retained after Brown split him late 1933 start own engine manufacturing concern Junior Motors Corporation photo taken during series evening demonstration flights made H urle man past summer having seen gas model fly since mid-30s im pressed capabilities modern RC nostalgic sound old engine Hurleman built gas model two himself TWENTY- SEVENTH ANNUAL OLLDO RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 1011 121981 FRIDAY SATURDAY SUNDAY 9 am 6 9 am 6 9am 430 pm pm pm presented WEAK SIGNALS po box 5772 R/C CLUB toledo ohio 43613 4. ..... ___ Radio Technique/Myers Continued page 21 subject hasnt covered satisfac tion let know baseline get paid writing column research testing comes result interest subject expenses come out pocket dont have interest subject pre disposes spend money isnt much chance Ill write about try month entertaining informative above accurate profession man agement Structural Test Engineering motto Get right information purpose carries over column too George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Time Machine/Ritchie Continued page 24 Smith coil used Wilco unit Its lugs provide easy method attachment well primary electrical connections Its fiber shell also oil proof though Hot-Stuffed end covers just make sure added miniature closed-circuit jack engine could started run booster bat teries independent pencells position shutoff switch Its wired booster plug interrupts circuit pencells dummy jack plug can inserted socket deactivate entire system extreme forward mounting ignition has number advantages helps balance ship allows maximum distance between placement coil receiver short length wiring necessary reach timer spark plug probably contributes reliable operation both engine radio tunately everything fits neatly beneath Clip per s nose cowl date ship has accumulated over 300 flights number different power plants various model Brown Jr Hurleman engines small collection Ive played around some different condensers capacitors prefer Just about anything between 01 01 mFd 250 600v will work electrical values dont seem too critical like best 01 mFd 400vsame originally supplied Brown Jr Most caps range polarized attention must paid plusses minuses hooking up Also caps small physical size dont last long Ive flown two different Wilco coils RUBBER STRIP FAI RUBBER 4 out 5 flyoff 1979 World Championships used FAI RUBBER Made USA SIZES % 3/16 1/8 3/32 1/16 1mm 042 thick SPOOLED GROSS WT 1% 1- LBS PRICE $1250 first spool PPD US Additional spools $1250 NEW PIRELLI SIZES 6mm 5mm 4mm X 1mm PRICE $1500 first hank PPD US Additional spools $1450 Sole US Distributor World-Wide Sales Send 25 cents 1980 Catalog ____ FAI Model Supply P0 Box 3957 Torrance CA 90510 Smith Competitor coil addition Smith Firecracker used Cavalier work about same As far spark lead resistor concerned theres no noticeable difference between 10K 12K would imagine resistance could increased until begins affect engine performance boosterbattery setup have pencell life quite good Ive replaced perhaps three four times radio may may impor tant part equation flying spark-ignition engines RC Mine five-year-old World Engines Expert Mark 7-channel 75640 MHz Ive used Worlds S-Il servos well Novak Bantam Midgets equal success Clipper 250 mAh flight battery entirely adequate full days flying Undoubtedly some makes radios maybe some individual radios same make probably susceptible ignition interference others Kraft radios particular seem have bad reputation regard yet Jack Van Dusen has flying dual-conversion Kraft receiver along really hot unshielded electronic ignition Dallaire Sportster re cently Jack way has 10K resistor spark lead too maybe thats ticket Clearly work needs done suspect spark-ignition engines probably flyable RC modelers thinkand having hire electrical engineer dream up fancy ignition system Word needs passed around what works what doesnt have old sparker youd like fly afraid losing Free Flight try RC RC Giant Scale/Beckman Continued page 27 Hostetlers super scale plans first heard Wendell Hostetler several years ago blew up Sig Skybolt Quarter Scale size Skybolt still going strong lot people have built own Wendells plans has added plans Liberty Sport Bucker Jungmeister comment below following appears instruction manual Liberty Sport very interesting note ages purchased plans first project Skybolt Almost excep tion over 40 has changed approach towards what should should included instructional manual thought beginners less experience would go Giant Scale route included Continued page 108 104 Model Aviation PLANS & CONSTR MANUAL Curtis s Hawk P6E Stinson Reliant SR9 2/4SCALE 94 ASP 52250 1/4SCALE i2BSP $2500 aSCALE 63SPAN $1250 SCALE ROSPAN 51500 IjSCALE 475/a SSi05O 25 SCALE 62 SPAN 51250 Curtiss FIIC2 Curtiss Gulfhawk IA iASCALE 545SP $3000 i/4SCALE 94SSP *3000 2SCALE 62SP $1500 2SCALE B3SP $1500 PLEASE ADD *200 FORP/N USASEND *100 WRITE FOR MAILING INFORMATION GAlA LOGE INCLUDE $100 FOR CATA LOGE 1213 HOLLY SPRING LANE GRAND BLANC MI 48439