TWO ELECTRIC MEETS start off months column First too long after get sue First Annual Lehigh Valley Radio Con trol Electric Fun-fly two-day meet scheduled June 18-19 Lehigh Valley club field near Easton PA Complete details available write will known time read Just write call Ellis Grumer 321 Aurora St Phillipsburg NJ 08865 phone him 201/859-0969 hell give full information Ellis has regular tendee KRC meet years know knows have good time meetso can look forward great time too Ill see Next slated somewhat later Second Annual Electric Meet near Winston-Salem NC August 20-21 information will forth coming later meantime can drop line Dr John Mountjoy 1420 Plaza Dr Win ston-Salem NC 27103 will see get needed info might say John also no stranger annual KRC meet routinely wins all-up last-down prize money Anyway North Carolina meet will struc tured mostly fun-fly formatBUT will have prizes longest flight guessed all-up last-down event can tell advance watch out Dr John cause just think youve got him beat just hes pulling back stick laying body English can muster seemingly trying few desperate seconds air time glowingly float several feet higher above know ing hes down youve wonhell turn Ed Schmitt Telford PA brand-new Goldberg Electra Standard Goldberg motor turning 8 x 4 prop six 1 2-Ah cells ade quate sport flying Kopski has never seen fly comfortably very successful popular kit Competition run-time limited events calls cobalt motor Electric juice blow right past other climbout Ohhhh ughhhh What sicken ing feeling Rememberya Vic Walpole Ajax Ontario Canada always very friendly guy Robin Wood Glider unique Fuselage thick laminated profile core removable formed plastic cheeks Astro geared cobalt 05 held tie-wraps other Electric RC hardware attaches core All-up weight 45oz Airfoil Eppler 205 section folding prop Fredenthaler 13 x 6 secretary Electric Model Fliers Southern Ontario editor its outstanding club publication Electric Model Flyer 40 Model Aviation Radio Conoi Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Another Electra 05 cobalt-powered Master Airacrew folding prop cut 11 Vs-in diameter belongs Jim Duckworth Warner-Robbins GA Covering clear Seal Lamin usually em ployed cover documents conven tional orange film iron-on trim Modified Robbe Geier Bob Rumsey Randolph NJ flies very well quite fastAstro co balt 15 dozen 800 mAh cells 7 x 4 fan Adams speed control weighs 51 oz Impressive warned right Model Aviation modified Astro DC/DC Super Charger keeps mail flowing now readers have probably memorized repeated reference September 1987 article tells modify subject product constant-current operation Other follow-up discussions ar ticle appeared October December 1987 April May 1988 issues now would think everythings written could written about matter NO some good stuff resulting readers questions Before continuing suggest dig Out original article September 1987 look bottom right-hand photo page 83 photo details green wire attachment original printed circuit board located under large metal-framed inductor photo shows wire soldered large circuit ground conductor negative potential top surface printed circuit card sur face nearest inductor Ordinarily connec tion no problem matter Well seems some readers have trou ble doing because recent versions Astro Model 102 have somewhat different printed circuit boardone no metal solder shown photo worry need solder same wire under side circuit card side nearest charger front panel copper claddingright under photo presents topside attachment little close working space can done disassembly original pc board inductor mounting hardware connection electrically equivalent originally described should present no problems newly formed Electric club called West Oaldand Lectric Fliers WOLF has orga nized Union Lake area Michigan club president Ken Myers can reached 9043 Satellite Union Lake MI 48005 phone number 313 698-4660 WOLF AMA chartered #2354 pub lishes good-looking newsletter called what else WOLFs Call get touch Ken group join Tell em Bob sent ya Electric ARFs ARF means almost-ready-to fly Ed continue bring questions often asked question ARF suitable basic flight training question always Continued page 133 unique wrap-around design Airflo Mounts provide reduced drag clean sturdy vibration free front end Fourmost Products 4040 24th Avenue Forest Grove Oregon 97116 503 357-2732 HOBBY /-- II 919 291-8548 RADIO Radio trouble? Hobby Radio offers professional RC repairs fications make R/G equipment produced last 25 years Complete system service battery pack AhI~ servos vibration testing new frequency change etc Also RICer likes do-it-yourself Hobby Radio Volume 142 page journal including diagrams charts detailed modifications written simple understandable text Send $1995 Hobby Radio 401 Lillian Rd Wilson NC 27893 legal size SASE price list complete services YOUR R/C SPECIALIST14I WILHAMS ACCESSORIES IT DEPT MA 181 4 PILOTS STANDARD TSMAN RACING TARY 0 WHEELS AGE TH CONTOUR BALLOON E 4 ENGINES PRATT & WHITNEY HT HONR PARTS T1 & IWHITNEY HONE WRIGHT R GUNSi tICKERS DAU BELLUM July 1988 41 Engine Mounts Fourmost 049/051 Airf lo Engine Mount Ellis Grumer Phillipsburg NJ Jersey Goose Twin geared 159 power unusual-but-excellent-flying original Allbalsa/stick structure covered Micafilm Crafts lower stub wing visible photo well-known unusual superbly flying designs outstanding craftsmanship Price $400 IIIIVII 'STRATEDCATALOG CALIFORNIA 92069 RC Giant Scale/de Vries Continued page 39 new volumean anthology Matts Waco draw ings articles Well leave month Wonderful World Oz Dorothy Toto ever people Century Systems America PO Box 4085 Costa Mesa CA 92626 Oz reference course refers source productsthe great Australian subcontinent Century Systems has some neatest electronic equipment weve seen like NiCd recyclers timers attached gyro sys tems lost-model alarms four-channel fail-safe devices airborne battery-switching black boxes latter item provides dual battery power strongly recommended Giant Scale experts An SASE will probably produce mail box filler house cant wait Century Systems has a toll-free order number 1-800-999-1214 Remember Giant Scale fun RC Electrics/Kopski Continued page 41 makes feel bad because Im loss re spond What mean far know NO good Electric ARFs suitable ba sic flight training purposes RC flight background always suggest poten tially spirited Etude again have seen what would consider basic Electric ARF flight trainer persons NO prior flight experi ence Manufacturers take note good industry folks chooses pursue please good jobone will promote both Elec tric image Its easy tempting throw together some overweight underpowered plastic dog just limps around proves Electrics no good command DONT DO IT subject steadfast Electric rec ommendation first-time other time Electric flight Leisure Amptiquebut its ARF An equally excellent low-cost choice interested Glider configuration Gold berg Electra first truly successful com plete Electric kitthe showed indus try importantly its worth doing own view has modeling indus try large has historically viewed Electric merely remote stepchild worth bothering WRONG Goldberg folks proved Electra What proof Proof others follow lead Just simple idea packaging adequate motor wiring prop such kit design flies well took Success came because its direct overthe-counter answer popular Electric question time What motor what plane Nice work Carl Goldberg Models Inc Its raining write reminds something experienced last spring Id like pass along Saturday March 22 1987 keep logsee August 1984 issue MA then-brand-new Caliph ready fly drizzlingbut didnt matter new plane just couldnt wait get air Besides whats little wetness Neither MonoKote nor would mind Now before go July August 1987 issues MA may just want dig em out look photo details Ca liph featured large air intakes just behind mounted Jomar SC-4 speed control First flights went very well during third flight something funny happening motor control rpm became erratic Fi nally motor came full stayed way till battery depleted make story simple speed control fine layer wa ter itthe result drizzle being ingested air intakes moist circuit board prevented SC-4 working properly returned full nor mal operation blow-dried carefully TOO hot MonoKote gun Sorta reminds some old wives tale about electric ity water mixing something like Larger power systems topic opened up April May t988 issues discus sion promised later Well its later some thoughts breaking 05 barrier Multi-YUK 05 such appropriate way describe electric motor As mentioned before 15 view excellent choice going past sevencell limit because its previously de scribed versatility also because low est cost bigger systems Also mentioned fact have six Cobalt 15s have motorsI also have some performance data gives chance demonstrate performance samplean unusual opportun ity just fun Im going clude comparable data some other iSs well RPM 12 3 4 5 6 7 8 9 data Table 1 presents what call prop power Now fact entitlement some what misnomer What really mean motor power input required turn prop specific listing motor electrical input power motor-volts times motor-amps re quired turn specific prop over chosen range rpm values data taken adjusting applied motor voltage power supply its special high-power unit until rpm reached desired values noting voltage current drain data collected bench over about six-year period same prop used throughout Since time period included wide range shop air conditions temperature humidity some lack control con tained herein Nevertheless should give good representation prop power haves Table 2 different kind table listing gives average voltage current six cobalt iSs power levels table Also included minimum maximum power extremes ie best worst motors As can readily seen performPRECISION MODEL PRODUCTS Made USA BARSTOCK ALUMINUM SPINNERS RetailApprax Pan NaSizePriceWeight TT1500 .. 11/2 S1395058ez 1T175B .. 13/4 1495 . 095ox rT200-B z TI-225-B .. 21/41695150oz TT226-B .. 21/4FAIl1895150oz TT2508 .. 21/2189519002 T1251-B 21/2FAI 2095 170oz TT275B . 2295220ox T1276B /4FAt2495. 20002 rT300B 3269526002 TT-301B 3 FAt2895250oz TT325-B 369534002 TT350B . 3112 4995. 470oz fl3750 5995520oz TT400B 995. 57002 3 Pieces Cone Back Plate Retainer Screw Nole 3 4 Blade Spinners Available Sizes Add 53 00 Per Spinner PROP NUT ADAPTORS U Ot Part NoSize TT140A1/428 IT147A1/428/7mm TT610A 6 x 1 0mm TT710A7 x 1 0mm 1T516A5/1624 tT-518A5/1624/8mm TT-810A8 x 1 0mm TT825AOx 1 25mm TT-375A3/824 TT-125AlOx 1 25mm RetailAppros PriceWeighi 5495061 02 4950 61 02 495063sz 495082 02 495076oz 495 176oz 495I 76 02 4950 75 02 595ll7oz 5951 l5oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change milhovt notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 July 1988 133 Table 1 MOTOR INPUT POWER 15-SIZED MOTORS AT VARIED RPM Top Flite 8 x 4 wood prop power shown watts Motor 900064666268616360 iQOGO 599i55Si8589555390 11000liti22itS127ii3itS1211i2i22 i2000156i60iso168152151ISi149i42 i3tO0202220i97i95195 MotorsI through 6 Astro cobalt15srepresentingthe very earliest ones very newest Motors 7 5 Asleo super ferrite ISs Finally motorS isa nine-year-old early version Astro black-back 15 thats J-3 since 1979 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 12500 VISA erCard y Order Michigan residents add 4% sales tax Add $550 P&H US orders $1250 foreign Video Catalog $1250 Ipoat mci VHS/Beta 95 rebate return tape kit order Reg catalog sample mini-plan -$2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd 27Y__Saginaw MI 48603 517 781-3000 Other Kits Available Aero-Pacer Baby -Pacer Gipsy Moth Flybaby Flybaby Combo Hawker Hurricane Jester Table 2 PERFORMANCE SUMMARY SIX ASTRO COBALT iSa data average six motors RPM Voltage Current Power Mm/Max Psvr voltsampswattswatts 900077846461/68 tO000871028885/91 ItOCO98123119113/127 12000109146156150/168 13000120173204t97/220 ance spread relatively narrow included averages can also tell voltages currents super ferrites right line cobalt averages listing should useful would like know 15 cobalt super ferrite stacks up need run motor measure brush terminal volt age current prop rpmor two parametersand youll know yours com pares speed control installation easy range numbers may compared Fi nally seriously interested modelers can add versatility info smoothly graphing thereby having possible numbers range look As matter historic technical interest operating conditions voltage current power eight Astro cobalts super fer rites virtually indistinguishable other far performance concerned motor No 9my very old black back 15 power inputs various rpm levels exactly like newer motors input voltages currents quite different nothing bad about Its just earlier days Electric brushes commutators couldnt take heat motors wound operate higher voltages lower currents Thus good ol 15 normally used 16 cells lower currents todays iSs nor mally used 12 cells higher currents Bat tery cost driven cell count cell size same flight performance can say newer motors use cheaper batteries So much discussion Later well take look some performance information iSs various other propsand geared ver sions well Meanwhile upwards 200 watts comfortable capability 15and especially cobalt 15 because its lighter weightis good size consideration larger power system special request goes out person New York think 1987 KRC Electric Fly spent entire weekend tripod-mounted video camera youre reading please get touch Please forward comments questions photos SASE please address given very top column Happy Quiet Landings Everyone RC Aerobatics/ Van Putte Continued page 43 wrote Some months ago assembled Ace R/C Digipace kit Having amateur radio operator over 40 years Ive assembled kits well having laid out etched several boards relating RTTY particular kit should avoided experienced builder Anyone interested Digipace would be-well advised pay $10 difference tween mail order kit assembled tested unit reasons saying thistoo include letter would like assemble kit have enclosed tip sheet Ive put together tip sheet available anyone SASE Write RJ Pinkerton 2500 ONeal Circle Birmingham AL 35226 tip sheet RC Slope Soaring/Triebes Continued page 45 F3F slope racing rules use pilot stands center 330ft course After launch pilot has 30 sec onds get plane course Ten laps timed winner round re ceives 1000 points yes its exactly like F3B Speed contest has minimum 5 maximum 10 rounds throw-out round Its very simple CD infinitely difficult competi tor Fast runs good weather range 50 60 seconds best performance North Sea Cup 454 seconds 22 mph winds wind direction 20 side Danish record 403 seconds 40 mph winds slopes Denmark Swe den mostly coastside cliffs some 110 200 ft high 450 steep very clean have same type slopes southwest coast Norway also use inland mountains 4000 ft high night last summer flew F3B model hour two such slope Norway together 22 Norwegian Swedish pilotsno midairs typical Danish slope racer has twistwing ailerons flaps coupled elevator no brakes Wingspans average eight 81/2 ft use modified Eppler 180 374 airfoils E374 thinned 85% 10% reflex top E180 ten flattened popular airfoil used Den mark Thy Combination E180 root E374 tips thinned 10% Turn ing techniques less ballast name Speed game race highest winds loading 13 15 oz/sq ft unballasted 18 20 ozIsq ft bal lasted FUN what about Most magazines print technical organiza tional details slope gliding Northern Europe little said about great fun have must way share enjoyment sport certainly agree what Purben say ing whole reason us volved sport pure fun thrill want column dry technical report although will defi nitely contain some technical material rather means slope fliers around country world communicate ideas stories am really looking forward Slopers out send ing stories humorous exciting ser ious otherwise photos can shared other Slopers 134 Model Aviation Wa SUNSHINE HOBBY READY TO FLY Call 1-800-45-TO FLY ACCESSORIES INCLUDED PIPER CHEROKEE-40$12999 PIPER CHEROKEE-2510899 FOKKER E111-4011999 FANCY STICK-4tJ11499 FANCY STICK-256999 CESSNA 172-2010899 CONDOR-40L11999 TERCEL-4512199 ENGINE NOT INCLUDED PIONEER CAR$6000 ENGINE INCLUDED 17221 South Western Avenue Gardena California 90247 CONTACT us FOR THIS MONTHS 5PECIAL
Edition: Model Aviation - 1988/07
Page Numbers: 40, 41, 133, 134
TWO ELECTRIC MEETS start off months column First too long after get sue First Annual Lehigh Valley Radio Con trol Electric Fun-fly two-day meet scheduled June 18-19 Lehigh Valley club field near Easton PA Complete details available write will known time read Just write call Ellis Grumer 321 Aurora St Phillipsburg NJ 08865 phone him 201/859-0969 hell give full information Ellis has regular tendee KRC meet years know knows have good time meetso can look forward great time too Ill see Next slated somewhat later Second Annual Electric Meet near Winston-Salem NC August 20-21 information will forth coming later meantime can drop line Dr John Mountjoy 1420 Plaza Dr Win ston-Salem NC 27103 will see get needed info might say John also no stranger annual KRC meet routinely wins all-up last-down prize money Anyway North Carolina meet will struc tured mostly fun-fly formatBUT will have prizes longest flight guessed all-up last-down event can tell advance watch out Dr John cause just think youve got him beat just hes pulling back stick laying body English can muster seemingly trying few desperate seconds air time glowingly float several feet higher above know ing hes down youve wonhell turn Ed Schmitt Telford PA brand-new Goldberg Electra Standard Goldberg motor turning 8 x 4 prop six 1 2-Ah cells ade quate sport flying Kopski has never seen fly comfortably very successful popular kit Competition run-time limited events calls cobalt motor Electric juice blow right past other climbout Ohhhh ughhhh What sicken ing feeling Rememberya Vic Walpole Ajax Ontario Canada always very friendly guy Robin Wood Glider unique Fuselage thick laminated profile core removable formed plastic cheeks Astro geared cobalt 05 held tie-wraps other Electric RC hardware attaches core All-up weight 45oz Airfoil Eppler 205 section folding prop Fredenthaler 13 x 6 secretary Electric Model Fliers Southern Ontario editor its outstanding club publication Electric Model Flyer 40 Model Aviation Radio Conoi Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Another Electra 05 cobalt-powered Master Airacrew folding prop cut 11 Vs-in diameter belongs Jim Duckworth Warner-Robbins GA Covering clear Seal Lamin usually em ployed cover documents conven tional orange film iron-on trim Modified Robbe Geier Bob Rumsey Randolph NJ flies very well quite fastAstro co balt 15 dozen 800 mAh cells 7 x 4 fan Adams speed control weighs 51 oz Impressive warned right Model Aviation modified Astro DC/DC Super Charger keeps mail flowing now readers have probably memorized repeated reference September 1987 article tells modify subject product constant-current operation Other follow-up discussions ar ticle appeared October December 1987 April May 1988 issues now would think everythings written could written about matter NO some good stuff resulting readers questions Before continuing suggest dig Out original article September 1987 look bottom right-hand photo page 83 photo details green wire attachment original printed circuit board located under large metal-framed inductor photo shows wire soldered large circuit ground conductor negative potential top surface printed circuit card sur face nearest inductor Ordinarily connec tion no problem matter Well seems some readers have trou ble doing because recent versions Astro Model 102 have somewhat different printed circuit boardone no metal solder shown photo worry need solder same wire under side circuit card side nearest charger front panel copper claddingright under photo presents topside attachment little close working space can done disassembly original pc board inductor mounting hardware connection electrically equivalent originally described should present no problems newly formed Electric club called West Oaldand Lectric Fliers WOLF has orga nized Union Lake area Michigan club president Ken Myers can reached 9043 Satellite Union Lake MI 48005 phone number 313 698-4660 WOLF AMA chartered #2354 pub lishes good-looking newsletter called what else WOLFs Call get touch Ken group join Tell em Bob sent ya Electric ARFs ARF means almost-ready-to fly Ed continue bring questions often asked question ARF suitable basic flight training question always Continued page 133 unique wrap-around design Airflo Mounts provide reduced drag clean sturdy vibration free front end Fourmost Products 4040 24th Avenue Forest Grove Oregon 97116 503 357-2732 HOBBY /-- II 919 291-8548 RADIO Radio trouble? Hobby Radio offers professional RC repairs fications make R/G equipment produced last 25 years Complete system service battery pack AhI~ servos vibration testing new frequency change etc Also RICer likes do-it-yourself Hobby Radio Volume 142 page journal including diagrams charts detailed modifications written simple understandable text Send $1995 Hobby Radio 401 Lillian Rd Wilson NC 27893 legal size SASE price list complete services YOUR R/C SPECIALIST14I WILHAMS ACCESSORIES IT DEPT MA 181 4 PILOTS STANDARD TSMAN RACING TARY 0 WHEELS AGE TH CONTOUR BALLOON E 4 ENGINES PRATT & WHITNEY HT HONR PARTS T1 & IWHITNEY HONE WRIGHT R GUNSi tICKERS DAU BELLUM July 1988 41 Engine Mounts Fourmost 049/051 Airf lo Engine Mount Ellis Grumer Phillipsburg NJ Jersey Goose Twin geared 159 power unusual-but-excellent-flying original Allbalsa/stick structure covered Micafilm Crafts lower stub wing visible photo well-known unusual superbly flying designs outstanding craftsmanship Price $400 IIIIVII 'STRATEDCATALOG CALIFORNIA 92069 RC Giant Scale/de Vries Continued page 39 new volumean anthology Matts Waco draw ings articles Well leave month Wonderful World Oz Dorothy Toto ever people Century Systems America PO Box 4085 Costa Mesa CA 92626 Oz reference course refers source productsthe great Australian subcontinent Century Systems has some neatest electronic equipment weve seen like NiCd recyclers timers attached gyro sys tems lost-model alarms four-channel fail-safe devices airborne battery-switching black boxes latter item provides dual battery power strongly recommended Giant Scale experts An SASE will probably produce mail box filler house cant wait Century Systems has a toll-free order number 1-800-999-1214 Remember Giant Scale fun RC Electrics/Kopski Continued page 41 makes feel bad because Im loss re spond What mean far know NO good Electric ARFs suitable ba sic flight training purposes RC flight background always suggest poten tially spirited Etude again have seen what would consider basic Electric ARF flight trainer persons NO prior flight experi ence Manufacturers take note good industry folks chooses pursue please good jobone will promote both Elec tric image Its easy tempting throw together some overweight underpowered plastic dog just limps around proves Electrics no good command DONT DO IT subject steadfast Electric rec ommendation first-time other time Electric flight Leisure Amptiquebut its ARF An equally excellent low-cost choice interested Glider configuration Gold berg Electra first truly successful com plete Electric kitthe showed indus try importantly its worth doing own view has modeling indus try large has historically viewed Electric merely remote stepchild worth bothering WRONG Goldberg folks proved Electra What proof Proof others follow lead Just simple idea packaging adequate motor wiring prop such kit design flies well took Success came because its direct overthe-counter answer popular Electric question time What motor what plane Nice work Carl Goldberg Models Inc Its raining write reminds something experienced last spring Id like pass along Saturday March 22 1987 keep logsee August 1984 issue MA then-brand-new Caliph ready fly drizzlingbut didnt matter new plane just couldnt wait get air Besides whats little wetness Neither MonoKote nor would mind Now before go July August 1987 issues MA may just want dig em out look photo details Ca liph featured large air intakes just behind mounted Jomar SC-4 speed control First flights went very well during third flight something funny happening motor control rpm became erratic Fi nally motor came full stayed way till battery depleted make story simple speed control fine layer wa ter itthe result drizzle being ingested air intakes moist circuit board prevented SC-4 working properly returned full nor mal operation blow-dried carefully TOO hot MonoKote gun Sorta reminds some old wives tale about electric ity water mixing something like Larger power systems topic opened up April May t988 issues discus sion promised later Well its later some thoughts breaking 05 barrier Multi-YUK 05 such appropriate way describe electric motor As mentioned before 15 view excellent choice going past sevencell limit because its previously de scribed versatility also because low est cost bigger systems Also mentioned fact have six Cobalt 15s have motorsI also have some performance data gives chance demonstrate performance samplean unusual opportun ity just fun Im going clude comparable data some other iSs well RPM 12 3 4 5 6 7 8 9 data Table 1 presents what call prop power Now fact entitlement some what misnomer What really mean motor power input required turn prop specific listing motor electrical input power motor-volts times motor-amps re quired turn specific prop over chosen range rpm values data taken adjusting applied motor voltage power supply its special high-power unit until rpm reached desired values noting voltage current drain data collected bench over about six-year period same prop used throughout Since time period included wide range shop air conditions temperature humidity some lack control con tained herein Nevertheless should give good representation prop power haves Table 2 different kind table listing gives average voltage current six cobalt iSs power levels table Also included minimum maximum power extremes ie best worst motors As can readily seen performPRECISION MODEL PRODUCTS Made USA BARSTOCK ALUMINUM SPINNERS RetailApprax Pan NaSizePriceWeight TT1500 .. 11/2 S1395058ez 1T175B .. 13/4 1495 . 095ox rT200-B z TI-225-B .. 21/41695150oz TT226-B .. 21/4FAIl1895150oz TT2508 .. 21/2189519002 T1251-B 21/2FAI 2095 170oz TT275B . 2295220ox T1276B /4FAt2495. 20002 rT300B 3269526002 TT-301B 3 FAt2895250oz TT325-B 369534002 TT350B . 3112 4995. 470oz fl3750 5995520oz TT400B 995. 57002 3 Pieces Cone Back Plate Retainer Screw Nole 3 4 Blade Spinners Available Sizes Add 53 00 Per Spinner PROP NUT ADAPTORS U Ot Part NoSize TT140A1/428 IT147A1/428/7mm TT610A 6 x 1 0mm TT710A7 x 1 0mm 1T516A5/1624 tT-518A5/1624/8mm TT-810A8 x 1 0mm TT825AOx 1 25mm TT-375A3/824 TT-125AlOx 1 25mm RetailAppros PriceWeighi 5495061 02 4950 61 02 495063sz 495082 02 495076oz 495 176oz 495I 76 02 4950 75 02 595ll7oz 5951 l5oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change milhovt notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 July 1988 133 Table 1 MOTOR INPUT POWER 15-SIZED MOTORS AT VARIED RPM Top Flite 8 x 4 wood prop power shown watts Motor 900064666268616360 iQOGO 599i55Si8589555390 11000liti22itS127ii3itS1211i2i22 i2000156i60iso168152151ISi149i42 i3tO0202220i97i95195 MotorsI through 6 Astro cobalt15srepresentingthe very earliest ones very newest Motors 7 5 Asleo super ferrite ISs Finally motorS isa nine-year-old early version Astro black-back 15 thats J-3 since 1979 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 12500 VISA erCard y Order Michigan residents add 4% sales tax Add $550 P&H US orders $1250 foreign Video Catalog $1250 Ipoat mci VHS/Beta 95 rebate return tape kit order Reg catalog sample mini-plan -$2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd 27Y__Saginaw MI 48603 517 781-3000 Other Kits Available Aero-Pacer Baby -Pacer Gipsy Moth Flybaby Flybaby Combo Hawker Hurricane Jester Table 2 PERFORMANCE SUMMARY SIX ASTRO COBALT iSa data average six motors RPM Voltage Current Power Mm/Max Psvr voltsampswattswatts 900077846461/68 tO000871028885/91 ItOCO98123119113/127 12000109146156150/168 13000120173204t97/220 ance spread relatively narrow included averages can also tell voltages currents super ferrites right line cobalt averages listing should useful would like know 15 cobalt super ferrite stacks up need run motor measure brush terminal volt age current prop rpmor two parametersand youll know yours com pares speed control installation easy range numbers may compared Fi nally seriously interested modelers can add versatility info smoothly graphing thereby having possible numbers range look As matter historic technical interest operating conditions voltage current power eight Astro cobalts super fer rites virtually indistinguishable other far performance concerned motor No 9my very old black back 15 power inputs various rpm levels exactly like newer motors input voltages currents quite different nothing bad about Its just earlier days Electric brushes commutators couldnt take heat motors wound operate higher voltages lower currents Thus good ol 15 normally used 16 cells lower currents todays iSs nor mally used 12 cells higher currents Bat tery cost driven cell count cell size same flight performance can say newer motors use cheaper batteries So much discussion Later well take look some performance information iSs various other propsand geared ver sions well Meanwhile upwards 200 watts comfortable capability 15and especially cobalt 15 because its lighter weightis good size consideration larger power system special request goes out person New York think 1987 KRC Electric Fly spent entire weekend tripod-mounted video camera youre reading please get touch Please forward comments questions photos SASE please address given very top column Happy Quiet Landings Everyone RC Aerobatics/ Van Putte Continued page 43 wrote Some months ago assembled Ace R/C Digipace kit Having amateur radio operator over 40 years Ive assembled kits well having laid out etched several boards relating RTTY particular kit should avoided experienced builder Anyone interested Digipace would be-well advised pay $10 difference tween mail order kit assembled tested unit reasons saying thistoo include letter would like assemble kit have enclosed tip sheet Ive put together tip sheet available anyone SASE Write RJ Pinkerton 2500 ONeal Circle Birmingham AL 35226 tip sheet RC Slope Soaring/Triebes Continued page 45 F3F slope racing rules use pilot stands center 330ft course After launch pilot has 30 sec onds get plane course Ten laps timed winner round re ceives 1000 points yes its exactly like F3B Speed contest has minimum 5 maximum 10 rounds throw-out round Its very simple CD infinitely difficult competi tor Fast runs good weather range 50 60 seconds best performance North Sea Cup 454 seconds 22 mph winds wind direction 20 side Danish record 403 seconds 40 mph winds slopes Denmark Swe den mostly coastside cliffs some 110 200 ft high 450 steep very clean have same type slopes southwest coast Norway also use inland mountains 4000 ft high night last summer flew F3B model hour two such slope Norway together 22 Norwegian Swedish pilotsno midairs typical Danish slope racer has twistwing ailerons flaps coupled elevator no brakes Wingspans average eight 81/2 ft use modified Eppler 180 374 airfoils E374 thinned 85% 10% reflex top E180 ten flattened popular airfoil used Den mark Thy Combination E180 root E374 tips thinned 10% Turn ing techniques less ballast name Speed game race highest winds loading 13 15 oz/sq ft unballasted 18 20 ozIsq ft bal lasted FUN what about Most magazines print technical organiza tional details slope gliding Northern Europe little said about great fun have must way share enjoyment sport certainly agree what Purben say ing whole reason us volved sport pure fun thrill want column dry technical report although will defi nitely contain some technical material rather means slope fliers around country world communicate ideas stories am really looking forward Slopers out send ing stories humorous exciting ser ious otherwise photos can shared other Slopers 134 Model Aviation Wa SUNSHINE HOBBY READY TO FLY Call 1-800-45-TO FLY ACCESSORIES INCLUDED PIPER CHEROKEE-40$12999 PIPER CHEROKEE-2510899 FOKKER E111-4011999 FANCY STICK-4tJ11499 FANCY STICK-256999 CESSNA 172-2010899 CONDOR-40L11999 TERCEL-4512199 ENGINE NOT INCLUDED PIONEER CAR$6000 ENGINE INCLUDED 17221 South Western Avenue Gardena California 90247 CONTACT us FOR THIS MONTHS 5PECIAL
Edition: Model Aviation - 1988/07
Page Numbers: 40, 41, 133, 134
TWO ELECTRIC MEETS start off months column First too long after get sue First Annual Lehigh Valley Radio Con trol Electric Fun-fly two-day meet scheduled June 18-19 Lehigh Valley club field near Easton PA Complete details available write will known time read Just write call Ellis Grumer 321 Aurora St Phillipsburg NJ 08865 phone him 201/859-0969 hell give full information Ellis has regular tendee KRC meet years know knows have good time meetso can look forward great time too Ill see Next slated somewhat later Second Annual Electric Meet near Winston-Salem NC August 20-21 information will forth coming later meantime can drop line Dr John Mountjoy 1420 Plaza Dr Win ston-Salem NC 27103 will see get needed info might say John also no stranger annual KRC meet routinely wins all-up last-down prize money Anyway North Carolina meet will struc tured mostly fun-fly formatBUT will have prizes longest flight guessed all-up last-down event can tell advance watch out Dr John cause just think youve got him beat just hes pulling back stick laying body English can muster seemingly trying few desperate seconds air time glowingly float several feet higher above know ing hes down youve wonhell turn Ed Schmitt Telford PA brand-new Goldberg Electra Standard Goldberg motor turning 8 x 4 prop six 1 2-Ah cells ade quate sport flying Kopski has never seen fly comfortably very successful popular kit Competition run-time limited events calls cobalt motor Electric juice blow right past other climbout Ohhhh ughhhh What sicken ing feeling Rememberya Vic Walpole Ajax Ontario Canada always very friendly guy Robin Wood Glider unique Fuselage thick laminated profile core removable formed plastic cheeks Astro geared cobalt 05 held tie-wraps other Electric RC hardware attaches core All-up weight 45oz Airfoil Eppler 205 section folding prop Fredenthaler 13 x 6 secretary Electric Model Fliers Southern Ontario editor its outstanding club publication Electric Model Flyer 40 Model Aviation Radio Conoi Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Another Electra 05 cobalt-powered Master Airacrew folding prop cut 11 Vs-in diameter belongs Jim Duckworth Warner-Robbins GA Covering clear Seal Lamin usually em ployed cover documents conven tional orange film iron-on trim Modified Robbe Geier Bob Rumsey Randolph NJ flies very well quite fastAstro co balt 15 dozen 800 mAh cells 7 x 4 fan Adams speed control weighs 51 oz Impressive warned right Model Aviation modified Astro DC/DC Super Charger keeps mail flowing now readers have probably memorized repeated reference September 1987 article tells modify subject product constant-current operation Other follow-up discussions ar ticle appeared October December 1987 April May 1988 issues now would think everythings written could written about matter NO some good stuff resulting readers questions Before continuing suggest dig Out original article September 1987 look bottom right-hand photo page 83 photo details green wire attachment original printed circuit board located under large metal-framed inductor photo shows wire soldered large circuit ground conductor negative potential top surface printed circuit card sur face nearest inductor Ordinarily connec tion no problem matter Well seems some readers have trou ble doing because recent versions Astro Model 102 have somewhat different printed circuit boardone no metal solder shown photo worry need solder same wire under side circuit card side nearest charger front panel copper claddingright under photo presents topside attachment little close working space can done disassembly original pc board inductor mounting hardware connection electrically equivalent originally described should present no problems newly formed Electric club called West Oaldand Lectric Fliers WOLF has orga nized Union Lake area Michigan club president Ken Myers can reached 9043 Satellite Union Lake MI 48005 phone number 313 698-4660 WOLF AMA chartered #2354 pub lishes good-looking newsletter called what else WOLFs Call get touch Ken group join Tell em Bob sent ya Electric ARFs ARF means almost-ready-to fly Ed continue bring questions often asked question ARF suitable basic flight training question always Continued page 133 unique wrap-around design Airflo Mounts provide reduced drag clean sturdy vibration free front end Fourmost Products 4040 24th Avenue Forest Grove Oregon 97116 503 357-2732 HOBBY /-- II 919 291-8548 RADIO Radio trouble? Hobby Radio offers professional RC repairs fications make R/G equipment produced last 25 years Complete system service battery pack AhI~ servos vibration testing new frequency change etc Also RICer likes do-it-yourself Hobby Radio Volume 142 page journal including diagrams charts detailed modifications written simple understandable text Send $1995 Hobby Radio 401 Lillian Rd Wilson NC 27893 legal size SASE price list complete services YOUR R/C SPECIALIST14I WILHAMS ACCESSORIES IT DEPT MA 181 4 PILOTS STANDARD TSMAN RACING TARY 0 WHEELS AGE TH CONTOUR BALLOON E 4 ENGINES PRATT & WHITNEY HT HONR PARTS T1 & IWHITNEY HONE WRIGHT R GUNSi tICKERS DAU BELLUM July 1988 41 Engine Mounts Fourmost 049/051 Airf lo Engine Mount Ellis Grumer Phillipsburg NJ Jersey Goose Twin geared 159 power unusual-but-excellent-flying original Allbalsa/stick structure covered Micafilm Crafts lower stub wing visible photo well-known unusual superbly flying designs outstanding craftsmanship Price $400 IIIIVII 'STRATEDCATALOG CALIFORNIA 92069 RC Giant Scale/de Vries Continued page 39 new volumean anthology Matts Waco draw ings articles Well leave month Wonderful World Oz Dorothy Toto ever people Century Systems America PO Box 4085 Costa Mesa CA 92626 Oz reference course refers source productsthe great Australian subcontinent Century Systems has some neatest electronic equipment weve seen like NiCd recyclers timers attached gyro sys tems lost-model alarms four-channel fail-safe devices airborne battery-switching black boxes latter item provides dual battery power strongly recommended Giant Scale experts An SASE will probably produce mail box filler house cant wait Century Systems has a toll-free order number 1-800-999-1214 Remember Giant Scale fun RC Electrics/Kopski Continued page 41 makes feel bad because Im loss re spond What mean far know NO good Electric ARFs suitable ba sic flight training purposes RC flight background always suggest poten tially spirited Etude again have seen what would consider basic Electric ARF flight trainer persons NO prior flight experi ence Manufacturers take note good industry folks chooses pursue please good jobone will promote both Elec tric image Its easy tempting throw together some overweight underpowered plastic dog just limps around proves Electrics no good command DONT DO IT subject steadfast Electric rec ommendation first-time other time Electric flight Leisure Amptiquebut its ARF An equally excellent low-cost choice interested Glider configuration Gold berg Electra first truly successful com plete Electric kitthe showed indus try importantly its worth doing own view has modeling indus try large has historically viewed Electric merely remote stepchild worth bothering WRONG Goldberg folks proved Electra What proof Proof others follow lead Just simple idea packaging adequate motor wiring prop such kit design flies well took Success came because its direct overthe-counter answer popular Electric question time What motor what plane Nice work Carl Goldberg Models Inc Its raining write reminds something experienced last spring Id like pass along Saturday March 22 1987 keep logsee August 1984 issue MA then-brand-new Caliph ready fly drizzlingbut didnt matter new plane just couldnt wait get air Besides whats little wetness Neither MonoKote nor would mind Now before go July August 1987 issues MA may just want dig em out look photo details Ca liph featured large air intakes just behind mounted Jomar SC-4 speed control First flights went very well during third flight something funny happening motor control rpm became erratic Fi nally motor came full stayed way till battery depleted make story simple speed control fine layer wa ter itthe result drizzle being ingested air intakes moist circuit board prevented SC-4 working properly returned full nor mal operation blow-dried carefully TOO hot MonoKote gun Sorta reminds some old wives tale about electric ity water mixing something like Larger power systems topic opened up April May t988 issues discus sion promised later Well its later some thoughts breaking 05 barrier Multi-YUK 05 such appropriate way describe electric motor As mentioned before 15 view excellent choice going past sevencell limit because its previously de scribed versatility also because low est cost bigger systems Also mentioned fact have six Cobalt 15s have motorsI also have some performance data gives chance demonstrate performance samplean unusual opportun ity just fun Im going clude comparable data some other iSs well RPM 12 3 4 5 6 7 8 9 data Table 1 presents what call prop power Now fact entitlement some what misnomer What really mean motor power input required turn prop specific listing motor electrical input power motor-volts times motor-amps re quired turn specific prop over chosen range rpm values data taken adjusting applied motor voltage power supply its special high-power unit until rpm reached desired values noting voltage current drain data collected bench over about six-year period same prop used throughout Since time period included wide range shop air conditions temperature humidity some lack control con tained herein Nevertheless should give good representation prop power haves Table 2 different kind table listing gives average voltage current six cobalt iSs power levels table Also included minimum maximum power extremes ie best worst motors As can readily seen performPRECISION MODEL PRODUCTS Made USA BARSTOCK ALUMINUM SPINNERS RetailApprax Pan NaSizePriceWeight TT1500 .. 11/2 S1395058ez 1T175B .. 13/4 1495 . 095ox rT200-B z TI-225-B .. 21/41695150oz TT226-B .. 21/4FAIl1895150oz TT2508 .. 21/2189519002 T1251-B 21/2FAI 2095 170oz TT275B . 2295220ox T1276B /4FAt2495. 20002 rT300B 3269526002 TT-301B 3 FAt2895250oz TT325-B 369534002 TT350B . 3112 4995. 470oz fl3750 5995520oz TT400B 995. 57002 3 Pieces Cone Back Plate Retainer Screw Nole 3 4 Blade Spinners Available Sizes Add 53 00 Per Spinner PROP NUT ADAPTORS U Ot Part NoSize TT140A1/428 IT147A1/428/7mm TT610A 6 x 1 0mm TT710A7 x 1 0mm 1T516A5/1624 tT-518A5/1624/8mm TT-810A8 x 1 0mm TT825AOx 1 25mm TT-375A3/824 TT-125AlOx 1 25mm RetailAppros PriceWeighi 5495061 02 4950 61 02 495063sz 495082 02 495076oz 495 176oz 495I 76 02 4950 75 02 595ll7oz 5951 l5oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change milhovt notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 July 1988 133 Table 1 MOTOR INPUT POWER 15-SIZED MOTORS AT VARIED RPM Top Flite 8 x 4 wood prop power shown watts Motor 900064666268616360 iQOGO 599i55Si8589555390 11000liti22itS127ii3itS1211i2i22 i2000156i60iso168152151ISi149i42 i3tO0202220i97i95195 MotorsI through 6 Astro cobalt15srepresentingthe very earliest ones very newest Motors 7 5 Asleo super ferrite ISs Finally motorS isa nine-year-old early version Astro black-back 15 thats J-3 since 1979 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 12500 VISA erCard y Order Michigan residents add 4% sales tax Add $550 P&H US orders $1250 foreign Video Catalog $1250 Ipoat mci VHS/Beta 95 rebate return tape kit order Reg catalog sample mini-plan -$2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd 27Y__Saginaw MI 48603 517 781-3000 Other Kits Available Aero-Pacer Baby -Pacer Gipsy Moth Flybaby Flybaby Combo Hawker Hurricane Jester Table 2 PERFORMANCE SUMMARY SIX ASTRO COBALT iSa data average six motors RPM Voltage Current Power Mm/Max Psvr voltsampswattswatts 900077846461/68 tO000871028885/91 ItOCO98123119113/127 12000109146156150/168 13000120173204t97/220 ance spread relatively narrow included averages can also tell voltages currents super ferrites right line cobalt averages listing should useful would like know 15 cobalt super ferrite stacks up need run motor measure brush terminal volt age current prop rpmor two parametersand youll know yours com pares speed control installation easy range numbers may compared Fi nally seriously interested modelers can add versatility info smoothly graphing thereby having possible numbers range look As matter historic technical interest operating conditions voltage current power eight Astro cobalts super fer rites virtually indistinguishable other far performance concerned motor No 9my very old black back 15 power inputs various rpm levels exactly like newer motors input voltages currents quite different nothing bad about Its just earlier days Electric brushes commutators couldnt take heat motors wound operate higher voltages lower currents Thus good ol 15 normally used 16 cells lower currents todays iSs nor mally used 12 cells higher currents Bat tery cost driven cell count cell size same flight performance can say newer motors use cheaper batteries So much discussion Later well take look some performance information iSs various other propsand geared ver sions well Meanwhile upwards 200 watts comfortable capability 15and especially cobalt 15 because its lighter weightis good size consideration larger power system special request goes out person New York think 1987 KRC Electric Fly spent entire weekend tripod-mounted video camera youre reading please get touch Please forward comments questions photos SASE please address given very top column Happy Quiet Landings Everyone RC Aerobatics/ Van Putte Continued page 43 wrote Some months ago assembled Ace R/C Digipace kit Having amateur radio operator over 40 years Ive assembled kits well having laid out etched several boards relating RTTY particular kit should avoided experienced builder Anyone interested Digipace would be-well advised pay $10 difference tween mail order kit assembled tested unit reasons saying thistoo include letter would like assemble kit have enclosed tip sheet Ive put together tip sheet available anyone SASE Write RJ Pinkerton 2500 ONeal Circle Birmingham AL 35226 tip sheet RC Slope Soaring/Triebes Continued page 45 F3F slope racing rules use pilot stands center 330ft course After launch pilot has 30 sec onds get plane course Ten laps timed winner round re ceives 1000 points yes its exactly like F3B Speed contest has minimum 5 maximum 10 rounds throw-out round Its very simple CD infinitely difficult competi tor Fast runs good weather range 50 60 seconds best performance North Sea Cup 454 seconds 22 mph winds wind direction 20 side Danish record 403 seconds 40 mph winds slopes Denmark Swe den mostly coastside cliffs some 110 200 ft high 450 steep very clean have same type slopes southwest coast Norway also use inland mountains 4000 ft high night last summer flew F3B model hour two such slope Norway together 22 Norwegian Swedish pilotsno midairs typical Danish slope racer has twistwing ailerons flaps coupled elevator no brakes Wingspans average eight 81/2 ft use modified Eppler 180 374 airfoils E374 thinned 85% 10% reflex top E180 ten flattened popular airfoil used Den mark Thy Combination E180 root E374 tips thinned 10% Turn ing techniques less ballast name Speed game race highest winds loading 13 15 oz/sq ft unballasted 18 20 ozIsq ft bal lasted FUN what about Most magazines print technical organiza tional details slope gliding Northern Europe little said about great fun have must way share enjoyment sport certainly agree what Purben say ing whole reason us volved sport pure fun thrill want column dry technical report although will defi nitely contain some technical material rather means slope fliers around country world communicate ideas stories am really looking forward Slopers out send ing stories humorous exciting ser ious otherwise photos can shared other Slopers 134 Model Aviation Wa SUNSHINE HOBBY READY TO FLY Call 1-800-45-TO FLY ACCESSORIES INCLUDED PIPER CHEROKEE-40$12999 PIPER CHEROKEE-2510899 FOKKER E111-4011999 FANCY STICK-4tJ11499 FANCY STICK-256999 CESSNA 172-2010899 CONDOR-40L11999 TERCEL-4512199 ENGINE NOT INCLUDED PIONEER CAR$6000 ENGINE INCLUDED 17221 South Western Avenue Gardena California 90247 CONTACT us FOR THIS MONTHS 5PECIAL
Edition: Model Aviation - 1988/07
Page Numbers: 40, 41, 133, 134
TWO ELECTRIC MEETS start off months column First too long after get sue First Annual Lehigh Valley Radio Con trol Electric Fun-fly two-day meet scheduled June 18-19 Lehigh Valley club field near Easton PA Complete details available write will known time read Just write call Ellis Grumer 321 Aurora St Phillipsburg NJ 08865 phone him 201/859-0969 hell give full information Ellis has regular tendee KRC meet years know knows have good time meetso can look forward great time too Ill see Next slated somewhat later Second Annual Electric Meet near Winston-Salem NC August 20-21 information will forth coming later meantime can drop line Dr John Mountjoy 1420 Plaza Dr Win ston-Salem NC 27103 will see get needed info might say John also no stranger annual KRC meet routinely wins all-up last-down prize money Anyway North Carolina meet will struc tured mostly fun-fly formatBUT will have prizes longest flight guessed all-up last-down event can tell advance watch out Dr John cause just think youve got him beat just hes pulling back stick laying body English can muster seemingly trying few desperate seconds air time glowingly float several feet higher above know ing hes down youve wonhell turn Ed Schmitt Telford PA brand-new Goldberg Electra Standard Goldberg motor turning 8 x 4 prop six 1 2-Ah cells ade quate sport flying Kopski has never seen fly comfortably very successful popular kit Competition run-time limited events calls cobalt motor Electric juice blow right past other climbout Ohhhh ughhhh What sicken ing feeling Rememberya Vic Walpole Ajax Ontario Canada always very friendly guy Robin Wood Glider unique Fuselage thick laminated profile core removable formed plastic cheeks Astro geared cobalt 05 held tie-wraps other Electric RC hardware attaches core All-up weight 45oz Airfoil Eppler 205 section folding prop Fredenthaler 13 x 6 secretary Electric Model Fliers Southern Ontario editor its outstanding club publication Electric Model Flyer 40 Model Aviation Radio Conoi Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Another Electra 05 cobalt-powered Master Airacrew folding prop cut 11 Vs-in diameter belongs Jim Duckworth Warner-Robbins GA Covering clear Seal Lamin usually em ployed cover documents conven tional orange film iron-on trim Modified Robbe Geier Bob Rumsey Randolph NJ flies very well quite fastAstro co balt 15 dozen 800 mAh cells 7 x 4 fan Adams speed control weighs 51 oz Impressive warned right Model Aviation modified Astro DC/DC Super Charger keeps mail flowing now readers have probably memorized repeated reference September 1987 article tells modify subject product constant-current operation Other follow-up discussions ar ticle appeared October December 1987 April May 1988 issues now would think everythings written could written about matter NO some good stuff resulting readers questions Before continuing suggest dig Out original article September 1987 look bottom right-hand photo page 83 photo details green wire attachment original printed circuit board located under large metal-framed inductor photo shows wire soldered large circuit ground conductor negative potential top surface printed circuit card sur face nearest inductor Ordinarily connec tion no problem matter Well seems some readers have trou ble doing because recent versions Astro Model 102 have somewhat different printed circuit boardone no metal solder shown photo worry need solder same wire under side circuit card side nearest charger front panel copper claddingright under photo presents topside attachment little close working space can done disassembly original pc board inductor mounting hardware connection electrically equivalent originally described should present no problems newly formed Electric club called West Oaldand Lectric Fliers WOLF has orga nized Union Lake area Michigan club president Ken Myers can reached 9043 Satellite Union Lake MI 48005 phone number 313 698-4660 WOLF AMA chartered #2354 pub lishes good-looking newsletter called what else WOLFs Call get touch Ken group join Tell em Bob sent ya Electric ARFs ARF means almost-ready-to fly Ed continue bring questions often asked question ARF suitable basic flight training question always Continued page 133 unique wrap-around design Airflo Mounts provide reduced drag clean sturdy vibration free front end Fourmost Products 4040 24th Avenue Forest Grove Oregon 97116 503 357-2732 HOBBY /-- II 919 291-8548 RADIO Radio trouble? Hobby Radio offers professional RC repairs fications make R/G equipment produced last 25 years Complete system service battery pack AhI~ servos vibration testing new frequency change etc Also RICer likes do-it-yourself Hobby Radio Volume 142 page journal including diagrams charts detailed modifications written simple understandable text Send $1995 Hobby Radio 401 Lillian Rd Wilson NC 27893 legal size SASE price list complete services YOUR R/C SPECIALIST14I WILHAMS ACCESSORIES IT DEPT MA 181 4 PILOTS STANDARD TSMAN RACING TARY 0 WHEELS AGE TH CONTOUR BALLOON E 4 ENGINES PRATT & WHITNEY HT HONR PARTS T1 & IWHITNEY HONE WRIGHT R GUNSi tICKERS DAU BELLUM July 1988 41 Engine Mounts Fourmost 049/051 Airf lo Engine Mount Ellis Grumer Phillipsburg NJ Jersey Goose Twin geared 159 power unusual-but-excellent-flying original Allbalsa/stick structure covered Micafilm Crafts lower stub wing visible photo well-known unusual superbly flying designs outstanding craftsmanship Price $400 IIIIVII 'STRATEDCATALOG CALIFORNIA 92069 RC Giant Scale/de Vries Continued page 39 new volumean anthology Matts Waco draw ings articles Well leave month Wonderful World Oz Dorothy Toto ever people Century Systems America PO Box 4085 Costa Mesa CA 92626 Oz reference course refers source productsthe great Australian subcontinent Century Systems has some neatest electronic equipment weve seen like NiCd recyclers timers attached gyro sys tems lost-model alarms four-channel fail-safe devices airborne battery-switching black boxes latter item provides dual battery power strongly recommended Giant Scale experts An SASE will probably produce mail box filler house cant wait Century Systems has a toll-free order number 1-800-999-1214 Remember Giant Scale fun RC Electrics/Kopski Continued page 41 makes feel bad because Im loss re spond What mean far know NO good Electric ARFs suitable ba sic flight training purposes RC flight background always suggest poten tially spirited Etude again have seen what would consider basic Electric ARF flight trainer persons NO prior flight experi ence Manufacturers take note good industry folks chooses pursue please good jobone will promote both Elec tric image Its easy tempting throw together some overweight underpowered plastic dog just limps around proves Electrics no good command DONT DO IT subject steadfast Electric rec ommendation first-time other time Electric flight Leisure Amptiquebut its ARF An equally excellent low-cost choice interested Glider configuration Gold berg Electra first truly successful com plete Electric kitthe showed indus try importantly its worth doing own view has modeling indus try large has historically viewed Electric merely remote stepchild worth bothering WRONG Goldberg folks proved Electra What proof Proof others follow lead Just simple idea packaging adequate motor wiring prop such kit design flies well took Success came because its direct overthe-counter answer popular Electric question time What motor what plane Nice work Carl Goldberg Models Inc Its raining write reminds something experienced last spring Id like pass along Saturday March 22 1987 keep logsee August 1984 issue MA then-brand-new Caliph ready fly drizzlingbut didnt matter new plane just couldnt wait get air Besides whats little wetness Neither MonoKote nor would mind Now before go July August 1987 issues MA may just want dig em out look photo details Ca liph featured large air intakes just behind mounted Jomar SC-4 speed control First flights went very well during third flight something funny happening motor control rpm became erratic Fi nally motor came full stayed way till battery depleted make story simple speed control fine layer wa ter itthe result drizzle being ingested air intakes moist circuit board prevented SC-4 working properly returned full nor mal operation blow-dried carefully TOO hot MonoKote gun Sorta reminds some old wives tale about electric ity water mixing something like Larger power systems topic opened up April May t988 issues discus sion promised later Well its later some thoughts breaking 05 barrier Multi-YUK 05 such appropriate way describe electric motor As mentioned before 15 view excellent choice going past sevencell limit because its previously de scribed versatility also because low est cost bigger systems Also mentioned fact have six Cobalt 15s have motorsI also have some performance data gives chance demonstrate performance samplean unusual opportun ity just fun Im going clude comparable data some other iSs well RPM 12 3 4 5 6 7 8 9 data Table 1 presents what call prop power Now fact entitlement some what misnomer What really mean motor power input required turn prop specific listing motor electrical input power motor-volts times motor-amps re quired turn specific prop over chosen range rpm values data taken adjusting applied motor voltage power supply its special high-power unit until rpm reached desired values noting voltage current drain data collected bench over about six-year period same prop used throughout Since time period included wide range shop air conditions temperature humidity some lack control con tained herein Nevertheless should give good representation prop power haves Table 2 different kind table listing gives average voltage current six cobalt iSs power levels table Also included minimum maximum power extremes ie best worst motors As can readily seen performPRECISION MODEL PRODUCTS Made USA BARSTOCK ALUMINUM SPINNERS RetailApprax Pan NaSizePriceWeight TT1500 .. 11/2 S1395058ez 1T175B .. 13/4 1495 . 095ox rT200-B z TI-225-B .. 21/41695150oz TT226-B .. 21/4FAIl1895150oz TT2508 .. 21/2189519002 T1251-B 21/2FAI 2095 170oz TT275B . 2295220ox T1276B /4FAt2495. 20002 rT300B 3269526002 TT-301B 3 FAt2895250oz TT325-B 369534002 TT350B . 3112 4995. 470oz fl3750 5995520oz TT400B 995. 57002 3 Pieces Cone Back Plate Retainer Screw Nole 3 4 Blade Spinners Available Sizes Add 53 00 Per Spinner PROP NUT ADAPTORS U Ot Part NoSize TT140A1/428 IT147A1/428/7mm TT610A 6 x 1 0mm TT710A7 x 1 0mm 1T516A5/1624 tT-518A5/1624/8mm TT-810A8 x 1 0mm TT825AOx 1 25mm TT-375A3/824 TT-125AlOx 1 25mm RetailAppros PriceWeighi 5495061 02 4950 61 02 495063sz 495082 02 495076oz 495 176oz 495I 76 02 4950 75 02 595ll7oz 5951 l5oz 3 Pieces Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change milhovt notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 July 1988 133 Table 1 MOTOR INPUT POWER 15-SIZED MOTORS AT VARIED RPM Top Flite 8 x 4 wood prop power shown watts Motor 900064666268616360 iQOGO 599i55Si8589555390 11000liti22itS127ii3itS1211i2i22 i2000156i60iso168152151ISi149i42 i3tO0202220i97i95195 MotorsI through 6 Astro cobalt15srepresentingthe very earliest ones very newest Motors 7 5 Asleo super ferrite ISs Finally motorS isa nine-year-old early version Astro black-back 15 thats J-3 since 1979 Curtiss Jenny * Quality hand-cut kit complete plans rigging scale control setup wire parts pre-bent special hardware included parts individually indentified packaged Decals Major Decal * Engine sizes 20 40 FS 25 TS * Wing unit removes four screws less 3 minutes flying wires left intact * Superb flight characteristics Introductory Price 12500 VISA erCard y Order Michigan residents add 4% sales tax Add $550 P&H US orders $1250 foreign Video Catalog $1250 Ipoat mci VHS/Beta 95 rebate return tape kit order Reg catalog sample mini-plan -$2 Hand-Cut Quality Affordable Price AERODROME MODELS LTD 2623 S Miller Rd 27Y__Saginaw MI 48603 517 781-3000 Other Kits Available Aero-Pacer Baby -Pacer Gipsy Moth Flybaby Flybaby Combo Hawker Hurricane Jester Table 2 PERFORMANCE SUMMARY SIX ASTRO COBALT iSa data average six motors RPM Voltage Current Power Mm/Max Psvr voltsampswattswatts 900077846461/68 tO000871028885/91 ItOCO98123119113/127 12000109146156150/168 13000120173204t97/220 ance spread relatively narrow included averages can also tell voltages currents super ferrites right line cobalt averages listing should useful would like know 15 cobalt super ferrite stacks up need run motor measure brush terminal volt age current prop rpmor two parametersand youll know yours com pares speed control installation easy range numbers may compared Fi nally seriously interested modelers can add versatility info smoothly graphing thereby having possible numbers range look As matter historic technical interest operating conditions voltage current power eight Astro cobalts super fer rites virtually indistinguishable other far performance concerned motor No 9my very old black back 15 power inputs various rpm levels exactly like newer motors input voltages currents quite different nothing bad about Its just earlier days Electric brushes commutators couldnt take heat motors wound operate higher voltages lower currents Thus good ol 15 normally used 16 cells lower currents todays iSs nor mally used 12 cells higher currents Bat tery cost driven cell count cell size same flight performance can say newer motors use cheaper batteries So much discussion Later well take look some performance information iSs various other propsand geared ver sions well Meanwhile upwards 200 watts comfortable capability 15and especially cobalt 15 because its lighter weightis good size consideration larger power system special request goes out person New York think 1987 KRC Electric Fly spent entire weekend tripod-mounted video camera youre reading please get touch Please forward comments questions photos SASE please address given very top column Happy Quiet Landings Everyone RC Aerobatics/ Van Putte Continued page 43 wrote Some months ago assembled Ace R/C Digipace kit Having amateur radio operator over 40 years Ive assembled kits well having laid out etched several boards relating RTTY particular kit should avoided experienced builder Anyone interested Digipace would be-well advised pay $10 difference tween mail order kit assembled tested unit reasons saying thistoo include letter would like assemble kit have enclosed tip sheet Ive put together tip sheet available anyone SASE Write RJ Pinkerton 2500 ONeal Circle Birmingham AL 35226 tip sheet RC Slope Soaring/Triebes Continued page 45 F3F slope racing rules use pilot stands center 330ft course After launch pilot has 30 sec onds get plane course Ten laps timed winner round re ceives 1000 points yes its exactly like F3B Speed contest has minimum 5 maximum 10 rounds throw-out round Its very simple CD infinitely difficult competi tor Fast runs good weather range 50 60 seconds best performance North Sea Cup 454 seconds 22 mph winds wind direction 20 side Danish record 403 seconds 40 mph winds slopes Denmark Swe den mostly coastside cliffs some 110 200 ft high 450 steep very clean have same type slopes southwest coast Norway also use inland mountains 4000 ft high night last summer flew F3B model hour two such slope Norway together 22 Norwegian Swedish pilotsno midairs typical Danish slope racer has twistwing ailerons flaps coupled elevator no brakes Wingspans average eight 81/2 ft use modified Eppler 180 374 airfoils E374 thinned 85% 10% reflex top E180 ten flattened popular airfoil used Den mark Thy Combination E180 root E374 tips thinned 10% Turn ing techniques less ballast name Speed game race highest winds loading 13 15 oz/sq ft unballasted 18 20 ozIsq ft bal lasted FUN what about Most magazines print technical organiza tional details slope gliding Northern Europe little said about great fun have must way share enjoyment sport certainly agree what Purben say ing whole reason us volved sport pure fun thrill want column dry technical report although will defi nitely contain some technical material rather means slope fliers around country world communicate ideas stories am really looking forward Slopers out send ing stories humorous exciting ser ious otherwise photos can shared other Slopers 134 Model Aviation Wa SUNSHINE HOBBY READY TO FLY Call 1-800-45-TO FLY ACCESSORIES INCLUDED PIPER CHEROKEE-40$12999 PIPER CHEROKEE-2510899 FOKKER E111-4011999 FANCY STICK-4tJ11499 FANCY STICK-256999 CESSNA 172-2010899 CONDOR-40L11999 TERCEL-4512199 ENGINE NOT INCLUDED PIONEER CAR$6000 ENGINE INCLUDED 17221 South Western Avenue Gardena California 90247 CONTACT us FOR THIS MONTHS 5PECIAL