Radio Control E lectrics Bob Kopski BAD NEWS going open months column will close brighter side Ive recently learned trying buy some Astro has discontinued venerable Part No 2102 05/075 economy can-motor has made new Electric fliers quite happy indeed very unfortunate Astro continues expands high-quality higher-cost line its famous cobalts has nothing offer folks just want give Electric try minimal initial invest ment word get Goldberg Electra/motor combination being received market very well tends support what Ive just said what said recent past regarding commonplace problem Which motor plane So no question cobalts top performers everyone starts out Cadillac now being big hole what can recommend ask about economy Electric am setting about find alternatives luck Ill have some good news near future must realize however its difficult costly buy try possibilities wont recommend something trying Furthermore have no personal requirement since seven Electrics cobalt-equipped Neverthe less Im helping want needto go easy firstbecause thats howl start out understand feeling Other columns articles readers may find interest have recently appeared other publications So consistent policy trying pass much information possible some references Bob Aberle prolific writer varied work appears mainly Flying Models two Electric offerings interest April issue magazine first EMF sportpylon design configured economy motors EMF pretty T-tail article has lots good-quality detail photos Bobs other offering issue has care feeding flying 50-mAh Yes 50 receiver Ni-Cd packs small packs seem well-suited small Electrics would think hand-launched RC Sailplanes AMA Class Next no sooner May MA appeared column discussed some aspects pod-mounted motors same subject also appeared May issue Model Builder issue Electric Power columnist Mitch Poling interesting offerings same subject encourage interested motor-on-pod idea check out reference Finally what Im sure also good friendly spirit helping others Silent Power columnist Bob Sliff dedicated allotted space May issue ofRCM showing feels best beginning Electric fliers 50 Model Aviation Looking open hatch Bobs new Davey Systems Caliph Area just behind motor mount Hardware visible inciudes fuse Jomar SC-4 motor controi B arming switch various connectorseach chosen job done SC-4s MOSFETs mounted siuminum plate screwed baisa ralis Heres aii power piant works went Caiiph three basic sections 1 2-ceil 800 mAh battery pack control center motor Connectors used inciude insuieted crimp-type wire nut Sermos high-amp easy motor exchange Personalized Caiiph tail wheel instaiiation piece fuseiagehigh brasatubing inside seves bushing forthe 1/16-in wire tail wheel strut Just underthe stab can see thetwo wheel collarswhich secure strut lowercollar fitted short440 threaded rod holds screw-on ball-link wire rudder pushrod connected via Goldberg aileron coupler No 246 Everything fully adjustable removable Hole bottom fuselage cooling-air exit start out new venture selection very best costly equipment Truly different strokes different folks On/Off switches have discussed times places References MA include February 1984 January 1985 August 1986 have personally routinely using servo-driven toggle switches micro switches motor control years past have recommended Radio Shacks Part No 275-016 Lever Switch microswitch purpose Well days essentially gonenot because fault product because evolution power/motor systems see early days Electric motor designs favored higher-voltage greater cell count lower-current smaller cell size opera tion still favorite appli cations recent years however operating parameter preferences have reversed domestic contemporary motors con figured relatively lower-voltage highercurrent operation tiny Radio Shack switch simply cant handle higher above 10 amps current reliably So keeping times now generally encourage using larger micro switch particular Im now using Astro Continued page 150 MAGNIFICENT HIGH TECHNOLOGY AVIATION ART F-ill Warsaw PactF-ill Sunrise Detailed screen printed designs brilliant colors FRONT BACK ot BLACK premium weight USA made t-shirts Sizes S M L XLCatalog $1 00 Dynamic cap designs clearly Leading Edge Technology' Cap size adjustable size fits Available Shins two-sided $1295 AIF-4 F-la8-1SR-7i C-S F-14 Nightmare F-i4 A-78-52F-ill C-130 F-ill Terrorize F-iS A-joT-38KC-135 C-141 F-18 Shijie F-is AH-iM-l8-52 Arms Deal Available Shins one-sided $1095 F-i ii Libyan SunriseF-i ii Warsaw Pact 8-52 Reach Out8-52 Send Best Minimum 24 Shirt Order $250 off shirt Available Caps $795 F-iSSR-71B-25P-47Space Shuttle F-iS8-188-29ZeroTop Gun Minimum 24 Cap Order $150 off cap ShippingFirstEa Addi Shin/CapShirt/Cap USA$200$ 50 Canada$350$100 Other$550$150 Delivery Allow 2 3 weeks MENISA ORDERS CALt TOLL FREE 247-1728 Eat 8 Inside TX Customer Call 19151 695-09i8 Ext 2 Tesas customers add 6/5k tan No COOs send order check including shipping charges PACIFIC COAST OF TEXAS 2917 Robertson Dr. Dept 16 Abtlene TX 79606 ATT- CHEK7 ON-Board Battery Tester Saves Time. Saves Models Install RO Models Check receiver battery status press button Small Light /2 oz Precise Rugged BAlT-CHEK RX-1ORDER TODAY $1495at dealer Protune Corp 19141 462-6452 USAPO Box 1808 Poughkeepsie NY 12601 Capacitive Discharge Ignition CH Electronics Breakerless CD ignition System can installed engine o 15 large choinsaw type new 90 15 two four stroke engines perfect converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler 8 develops power.plus no kickback & very low idle CH system used engine expertsMaynard Hill George Aldridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kita available popular engines Custom engine set-up availabie Call write price quote Now IETC electronic timing control information brochure price list send $100 Box 1732 Riverton WY 82501 CH Electronics Phone 307-857-6897 NW August1987 51 closer look business end Bobs Caliph photos last months column Above see largeair intakes Air flows through fuselage cool motor speed controller heat sink batteries Note Golden Rod Inners looped over motor clamp place Photo below shows underside motor mounting plate Rectangular metal pieces washers under heads 2 56 screws secure ends Golden Rod motor clamps Astro geared cobalt same motor other photo Dodgson has new construction videotapes ready shipment Bobs Tape No came out last winter showed beautiful flying shots four planes produces design philos ophy New tape No 2 shows Dave Banks wing construction sequences runs two hours Tape No 3 shows fuselage construction linkage layouts 90 minutes havent seen new tapes Id imagine would invaluable anyone buildingor thinking buildingone Bobs kits refundable deposit $15 $30 $40 depending whether order two three tapes time Shipping handling $10 $15 $20 making total $25 $45 $60 Other news Bob extra $45 will partially pre-build fuselage new Windsong Camano Pixie Formers bulk heads elevator bearings nose wing saddle plywood decking installed rein forced called plans work done jig fuselage locked perfect alignment Bob also says business going great add help get backlog down manageable level Bobs address 21230 Damson Road Bothell WA 98021 phone number 206 776-8067 Valley Forges Fifth Annual Sailplane Contest will held August 15-16 site Valley Forge Signal Seekers flying field near King Prussia PA Sportsman Expert Junior will flown both class D class B both days Hand-Launch class event will flown both days Sport Scale Sunday biggest contests East hear its well-run lot fun CD will Fran Olix also Soaring CD Ehe Nats year info write Fran 764 Alexander Drive Hatfield PA 19440 phone 215 341-6713 day time 361-9516 evenings end column month Id like share contents note sent Mrs Mary Holley addressed Sailplaners expressed sympathy Dwights passing last December Model Soaring large part Dwights life know acknowledgement accomplishments type Champion would mean great deal himas does Bryon Blakeslee 3134 Winnebago Dr Sedalia CO 80135 Please enclose SASE responses SEND SASE FOR LITERATURE SHEETS Its also true instructors created equal Some people can fly own airplanes just fine cant teach others really good instructor can dramatically shorten training time student Now get tough onethe trainer airplane As mentioned earlier key learn ing fly RC keeping airplane piece good student has good instructor buddy-box needs entirely different airplane poor student no instructor powered Glider good choice trainer airplane students slow learners have poor/no instructors and/or no buddy-box type airplane inherently stable can often fly itself out trouble much easier fly land because moves relatively slowly novice pilot has better chance keep up aircrafts motion permits student time evaluate orientation airplane figure out what wing loading usually fairly low often allows survive crashes good shape wouldnt everyone want learn fly using powered Glider Well depending abilities novice pilot instructor availability buddy-box some students will learn lot faster others Pilots seldom use powered Glider type trainer-airplane much radio check airplane after learn fly So move advanced trainer much like airplane other proponents would have recommended start out means investment money long run its wasted pilot can learn fly quickly Having said Id straddle both sides issue must add beginner can decide airplane best satisfies training situation hes found himself Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 RC Electrics/Kopski Continued page 51 Part No 4032 priced $6 Cell size just mentioned above since readers experience some confusion difficulty dimension thought Id offer some additional information Before con tinuing may want reference April 87 MA column same subject 36 Cell size generally expressed either ampere-hours milliampere-hours expressions simply refer amount charge cell capable accepting delivering ie big tank electrically As example popular 12 Ah ampere hour cell can expected deliver about 12 amps hour 012 amps 10 hours such total current-time product So sixminute ho-hour motor run flight average motor current would have 12 amperes completely drain cell assuming started fully charged pack because 12 amps x Yo hour mpere-hours course cell capacity can also expressed minutes Thus same 1 2-Ah cellor pack can said have 72 ampere-minute capacity since 60 minutes hour 12 x 60 ust portion size description identifies time-factor can expressed way also can part describes electric current Thus 1 2-Ah example can also described having 1200 milliampere-hour capacity since 1000 milliamperes ampere Miii means 4ooosee July 1985 issue MA Combining above could call example 72000 milliampere-minute cell pack Well little cumbersome routinely used expression However does serve additional illustration idea cell size Great say what use Well lets say wanted fast-charge rather small motor pack Free Flight Electric Lets say using 250-mAh cells wanted charge 15 minutesthe longest period can set time-switch charger question comes up much charge current should used Remember doesnt matter cells areonly cells pack must same size obviously way look question approach realize 250 mAh one-quarter ampere-hour since 250/1000 could charge 1/4 ampere 250 milliamps hourbut thats four individual turns 15-minute hour charger-timer knob Since really want job just timer-knob turn charging has done four times faster Clearly example would charge 4 x 250 mulliamps 4 x amp amp 15 minutes Again 1 amp x 15 minutes p x ere-hour 250/1000 ampere-hour milliampere hours about something uneven Continued page 152 150 Model Aviation r3/4 SCALE CLASSICSHigh Performance Rubber Powered $1795 / KORDA 33___________ DEALER AND DISTRI BUTOR_________ INOUIRES INVITED PLUS 8 MORE RUBBER POWERED MODELS KIT INCLUDES FOLDING PROP MATERIALS SELECT WOODS FULL SIZE PLAN CLOUD 33 R/NmocielsPouox 5059ALAMOGORDO NM 88311 CLODHOPPER RC Aerobatics/Van Putte Continued page 49 responding advertIsers mention read about ModelAviation EiDer LiWNKUBE WUUZ WeSiyfOWOijat agiaiNew Prop Adapter far Byron 4 or3 bledqdiirop ANEgI. Complete Fits Sache engine wltn7lS bolt pattern 5 Neffibg Extra uuy 31 -*325 37- W200fformulypoatg S49 34-flU42-*420 Glees body Opifee aeA5fagleea wheal pants TlwotJecoupled cowl apark advancefoam wing aN balaa Included A-Uba2oa-SNP27-tlbe4ozPIHP42IIbaSoi7HP Tfar Sinai Carburetor Unkage CDI Ignition ICH ElectronloeL 45 Volt Ignition Pad Safety Switch S Bolt Hub Realator Spark Plugs 1 Watrantyon Faulty Parts end WorknianablpLaw Kit ENew 2glece wing coaseralon Laaar bulk bqnea Laeer Hardwup 0 extra TG MFGU 857 High Mountain Rd North Halodon NJ 07508 427-3845 like 100-mAh cell OK lets Using same 1 5-minute timer allows us think 100-mAb capacity 400 milliamp-quarter-hour size Thus sets charge current 04 amps 15 minutes tank full Another aid doing think 100 milliamps hour milliamps milliamps hour As final example lets check out popular 800-mAh 08 Ah size becomes 800 mA hour mps mps 15 minutes Presto practice Ive written times personally rarely try fill tank because Im basically sport flier want minimize accidental overfill possible cell dam age So generalization normally charge about 90% full give take little always beginning empty cell/pack example use about 42 44 amps recharging 12s since 12 amps hour 24 amps 48 amps 90% 432 amps Also normally use three-amp charge current 15 minutes 800s hope helps some Geared cobalts Astro very popular because speed reduction corresponding torque increase allow larger props used model types fly much better way gears require some care feeding too heres tale woe illustrate anxious try geared cobalt new Caliph failed pay attention what doing haste forgot apply some grease per instructions gears after installed new set new cobalt purchased gears motor separately different times Well gears both metal lasted about three four flights started sounding like concrete mixer lack lube ruined gears meso caution learn keep em both clean carefully greased use small amount white lithium auto grease new Caliph see last months column continues please very much Ive some opportunity try different motors So far have flown Caliph Keller 25/12 pictured last month Astro geared 05 15 cobalts Kyosho geared 360PT Tower Hobbies has received very limited flight timemuch bad weatherand its premature report com parative results now will however tell two motors used rather unconven tionally Theres enough column space month go detail really want accumulate flight time first now let just tease First may recall May column indicated motors can very often used varied ways shown instructions magazine material matter Well thats just exactly sort thing Ive doing Caliph point Ill just say right prop selections Ive flying Caliph geared cobalt 05 12 cells economy geared Kyosho 360PT nine cells want accumulate experience combinations initial results rather exciting coming up meantime Ill just get some Caliph/installation photos may prove help ful planning new installation its some other model photo details small addition motor mounting technique described last month So far motor clamps made using Golden Rod inners yellow part Sullivan blue outer sheath/yellow inner control-rod set have worked very well technique has allowed easy interchange motors mentioned above has trouble-free except time prop hit ground landing happened 2 56 screw head washer clamp pulled through -in lite-ply motor mount floor What needed larger washer solution shown photos cut two strips thin -in-wide hobby store brass stock drilled 3A2-in holes line up versatile variety existing Caliph motor floor used strips giant washers So far have no problems Another photo shows modified steerable tail wheel installation dont like idea having tail wheel mounted rudder because thing use tape hinges Electrics see About Electrics part nine May 1984 issue MA case rudders shouldnt have take abuse installation tail wheel has its own internal fuselage-high brass-tubing bearing separate linkage rudder pushrod benefit addition strength attained individual adjustability throw both rudder steeringand favorite tape hinges re main unburdened Odds ends As reminder readers since continue askId like again encourage buy copy Mitch Polings book t Build Fly Electric-Powered Modeis book experienced Electric writer know published Kaim back very worth $995 selling price As Ive Indicated previous columns readers have reacted very intensely posi tively April offering motor specifica tions/standards idea Some readers apparently have thought about detail have come up penetrating questions like does motor voltage current rpm specifications tell us prop use Well certainly knew remained question wrote column intent follow up information covering matter So stay tuned Still upcoming sometime inexpen sively modify nifty Astro DC DC Super Charger make constant-current charger really works makes charging vastly controlled opportune Finally may wonder just important factor excess weight model airplane can let suggest simple experiment Take favorite familiar sport aerobatic Electricone used flying know well add weight Put about 10% 15 % weight CG fly things would ordinarily expect plane doand see what happens Betcha just aint same ol plane closing thought Try think geared motors Rather try think geared props effect gears belts adjust usable size prop motor motor motorit doesnt change later too Please send comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 Happy Silent Summer Flying Fun Everyone RC Giant Scale/de Vries Continued page 53 Big Bird get-togethers rallies fun-flies several among number take great pleasure exercising Giant Scale portion rule book seems theres now provisional International FAI class big uns can competition highest level Dolly didnt have enough time tell FM choseto adopt Australian rules Big Bird competition guess start Continued page 154 152 Model Aviation
Edition: Model Aviation - 1987/08
Page Numbers: 50, 51, 150, 152
Radio Control E lectrics Bob Kopski BAD NEWS going open months column will close brighter side Ive recently learned trying buy some Astro has discontinued venerable Part No 2102 05/075 economy can-motor has made new Electric fliers quite happy indeed very unfortunate Astro continues expands high-quality higher-cost line its famous cobalts has nothing offer folks just want give Electric try minimal initial invest ment word get Goldberg Electra/motor combination being received market very well tends support what Ive just said what said recent past regarding commonplace problem Which motor plane So no question cobalts top performers everyone starts out Cadillac now being big hole what can recommend ask about economy Electric am setting about find alternatives luck Ill have some good news near future must realize however its difficult costly buy try possibilities wont recommend something trying Furthermore have no personal requirement since seven Electrics cobalt-equipped Neverthe less Im helping want needto go easy firstbecause thats howl start out understand feeling Other columns articles readers may find interest have recently appeared other publications So consistent policy trying pass much information possible some references Bob Aberle prolific writer varied work appears mainly Flying Models two Electric offerings interest April issue magazine first EMF sportpylon design configured economy motors EMF pretty T-tail article has lots good-quality detail photos Bobs other offering issue has care feeding flying 50-mAh Yes 50 receiver Ni-Cd packs small packs seem well-suited small Electrics would think hand-launched RC Sailplanes AMA Class Next no sooner May MA appeared column discussed some aspects pod-mounted motors same subject also appeared May issue Model Builder issue Electric Power columnist Mitch Poling interesting offerings same subject encourage interested motor-on-pod idea check out reference Finally what Im sure also good friendly spirit helping others Silent Power columnist Bob Sliff dedicated allotted space May issue ofRCM showing feels best beginning Electric fliers 50 Model Aviation Looking open hatch Bobs new Davey Systems Caliph Area just behind motor mount Hardware visible inciudes fuse Jomar SC-4 motor controi B arming switch various connectorseach chosen job done SC-4s MOSFETs mounted siuminum plate screwed baisa ralis Heres aii power piant works went Caiiph three basic sections 1 2-ceil 800 mAh battery pack control center motor Connectors used inciude insuieted crimp-type wire nut Sermos high-amp easy motor exchange Personalized Caiiph tail wheel instaiiation piece fuseiagehigh brasatubing inside seves bushing forthe 1/16-in wire tail wheel strut Just underthe stab can see thetwo wheel collarswhich secure strut lowercollar fitted short440 threaded rod holds screw-on ball-link wire rudder pushrod connected via Goldberg aileron coupler No 246 Everything fully adjustable removable Hole bottom fuselage cooling-air exit start out new venture selection very best costly equipment Truly different strokes different folks On/Off switches have discussed times places References MA include February 1984 January 1985 August 1986 have personally routinely using servo-driven toggle switches micro switches motor control years past have recommended Radio Shacks Part No 275-016 Lever Switch microswitch purpose Well days essentially gonenot because fault product because evolution power/motor systems see early days Electric motor designs favored higher-voltage greater cell count lower-current smaller cell size opera tion still favorite appli cations recent years however operating parameter preferences have reversed domestic contemporary motors con figured relatively lower-voltage highercurrent operation tiny Radio Shack switch simply cant handle higher above 10 amps current reliably So keeping times now generally encourage using larger micro switch particular Im now using Astro Continued page 150 MAGNIFICENT HIGH TECHNOLOGY AVIATION ART F-ill Warsaw PactF-ill Sunrise Detailed screen printed designs brilliant colors FRONT BACK ot BLACK premium weight USA made t-shirts Sizes S M L XLCatalog $1 00 Dynamic cap designs clearly Leading Edge Technology' Cap size adjustable size fits Available Shins two-sided $1295 AIF-4 F-la8-1SR-7i C-S F-14 Nightmare F-i4 A-78-52F-ill C-130 F-ill Terrorize F-iS A-joT-38KC-135 C-141 F-18 Shijie F-is AH-iM-l8-52 Arms Deal Available Shins one-sided $1095 F-i ii Libyan SunriseF-i ii Warsaw Pact 8-52 Reach Out8-52 Send Best Minimum 24 Shirt Order $250 off shirt Available Caps $795 F-iSSR-71B-25P-47Space Shuttle F-iS8-188-29ZeroTop Gun Minimum 24 Cap Order $150 off cap ShippingFirstEa Addi Shin/CapShirt/Cap USA$200$ 50 Canada$350$100 Other$550$150 Delivery Allow 2 3 weeks MENISA ORDERS CALt TOLL FREE 247-1728 Eat 8 Inside TX Customer Call 19151 695-09i8 Ext 2 Tesas customers add 6/5k tan No COOs send order check including shipping charges PACIFIC COAST OF TEXAS 2917 Robertson Dr. Dept 16 Abtlene TX 79606 ATT- CHEK7 ON-Board Battery Tester Saves Time. Saves Models Install RO Models Check receiver battery status press button Small Light /2 oz Precise Rugged BAlT-CHEK RX-1ORDER TODAY $1495at dealer Protune Corp 19141 462-6452 USAPO Box 1808 Poughkeepsie NY 12601 Capacitive Discharge Ignition CH Electronics Breakerless CD ignition System can installed engine o 15 large choinsaw type new 90 15 two four stroke engines perfect converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler 8 develops power.plus no kickback & very low idle CH system used engine expertsMaynard Hill George Aldridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kita available popular engines Custom engine set-up availabie Call write price quote Now IETC electronic timing control information brochure price list send $100 Box 1732 Riverton WY 82501 CH Electronics Phone 307-857-6897 NW August1987 51 closer look business end Bobs Caliph photos last months column Above see largeair intakes Air flows through fuselage cool motor speed controller heat sink batteries Note Golden Rod Inners looped over motor clamp place Photo below shows underside motor mounting plate Rectangular metal pieces washers under heads 2 56 screws secure ends Golden Rod motor clamps Astro geared cobalt same motor other photo Dodgson has new construction videotapes ready shipment Bobs Tape No came out last winter showed beautiful flying shots four planes produces design philos ophy New tape No 2 shows Dave Banks wing construction sequences runs two hours Tape No 3 shows fuselage construction linkage layouts 90 minutes havent seen new tapes Id imagine would invaluable anyone buildingor thinking buildingone Bobs kits refundable deposit $15 $30 $40 depending whether order two three tapes time Shipping handling $10 $15 $20 making total $25 $45 $60 Other news Bob extra $45 will partially pre-build fuselage new Windsong Camano Pixie Formers bulk heads elevator bearings nose wing saddle plywood decking installed rein forced called plans work done jig fuselage locked perfect alignment Bob also says business going great add help get backlog down manageable level Bobs address 21230 Damson Road Bothell WA 98021 phone number 206 776-8067 Valley Forges Fifth Annual Sailplane Contest will held August 15-16 site Valley Forge Signal Seekers flying field near King Prussia PA Sportsman Expert Junior will flown both class D class B both days Hand-Launch class event will flown both days Sport Scale Sunday biggest contests East hear its well-run lot fun CD will Fran Olix also Soaring CD Ehe Nats year info write Fran 764 Alexander Drive Hatfield PA 19440 phone 215 341-6713 day time 361-9516 evenings end column month Id like share contents note sent Mrs Mary Holley addressed Sailplaners expressed sympathy Dwights passing last December Model Soaring large part Dwights life know acknowledgement accomplishments type Champion would mean great deal himas does Bryon Blakeslee 3134 Winnebago Dr Sedalia CO 80135 Please enclose SASE responses SEND SASE FOR LITERATURE SHEETS Its also true instructors created equal Some people can fly own airplanes just fine cant teach others really good instructor can dramatically shorten training time student Now get tough onethe trainer airplane As mentioned earlier key learn ing fly RC keeping airplane piece good student has good instructor buddy-box needs entirely different airplane poor student no instructor powered Glider good choice trainer airplane students slow learners have poor/no instructors and/or no buddy-box type airplane inherently stable can often fly itself out trouble much easier fly land because moves relatively slowly novice pilot has better chance keep up aircrafts motion permits student time evaluate orientation airplane figure out what wing loading usually fairly low often allows survive crashes good shape wouldnt everyone want learn fly using powered Glider Well depending abilities novice pilot instructor availability buddy-box some students will learn lot faster others Pilots seldom use powered Glider type trainer-airplane much radio check airplane after learn fly So move advanced trainer much like airplane other proponents would have recommended start out means investment money long run its wasted pilot can learn fly quickly Having said Id straddle both sides issue must add beginner can decide airplane best satisfies training situation hes found himself Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 RC Electrics/Kopski Continued page 51 Part No 4032 priced $6 Cell size just mentioned above since readers experience some confusion difficulty dimension thought Id offer some additional information Before con tinuing may want reference April 87 MA column same subject 36 Cell size generally expressed either ampere-hours milliampere-hours expressions simply refer amount charge cell capable accepting delivering ie big tank electrically As example popular 12 Ah ampere hour cell can expected deliver about 12 amps hour 012 amps 10 hours such total current-time product So sixminute ho-hour motor run flight average motor current would have 12 amperes completely drain cell assuming started fully charged pack because 12 amps x Yo hour mpere-hours course cell capacity can also expressed minutes Thus same 1 2-Ah cellor pack can said have 72 ampere-minute capacity since 60 minutes hour 12 x 60 ust portion size description identifies time-factor can expressed way also can part describes electric current Thus 1 2-Ah example can also described having 1200 milliampere-hour capacity since 1000 milliamperes ampere Miii means 4ooosee July 1985 issue MA Combining above could call example 72000 milliampere-minute cell pack Well little cumbersome routinely used expression However does serve additional illustration idea cell size Great say what use Well lets say wanted fast-charge rather small motor pack Free Flight Electric Lets say using 250-mAh cells wanted charge 15 minutesthe longest period can set time-switch charger question comes up much charge current should used Remember doesnt matter cells areonly cells pack must same size obviously way look question approach realize 250 mAh one-quarter ampere-hour since 250/1000 could charge 1/4 ampere 250 milliamps hourbut thats four individual turns 15-minute hour charger-timer knob Since really want job just timer-knob turn charging has done four times faster Clearly example would charge 4 x 250 mulliamps 4 x amp amp 15 minutes Again 1 amp x 15 minutes p x ere-hour 250/1000 ampere-hour milliampere hours about something uneven Continued page 152 150 Model Aviation r3/4 SCALE CLASSICSHigh Performance Rubber Powered $1795 / KORDA 33___________ DEALER AND DISTRI BUTOR_________ INOUIRES INVITED PLUS 8 MORE RUBBER POWERED MODELS KIT INCLUDES FOLDING PROP MATERIALS SELECT WOODS FULL SIZE PLAN CLOUD 33 R/NmocielsPouox 5059ALAMOGORDO NM 88311 CLODHOPPER RC Aerobatics/Van Putte Continued page 49 responding advertIsers mention read about ModelAviation EiDer LiWNKUBE WUUZ WeSiyfOWOijat agiaiNew Prop Adapter far Byron 4 or3 bledqdiirop ANEgI. Complete Fits Sache engine wltn7lS bolt pattern 5 Neffibg Extra uuy 31 -*325 37- W200fformulypoatg S49 34-flU42-*420 Glees body Opifee aeA5fagleea wheal pants TlwotJecoupled cowl apark advancefoam wing aN balaa Included A-Uba2oa-SNP27-tlbe4ozPIHP42IIbaSoi7HP Tfar Sinai Carburetor Unkage CDI Ignition ICH ElectronloeL 45 Volt Ignition Pad Safety Switch S Bolt Hub Realator Spark Plugs 1 Watrantyon Faulty Parts end WorknianablpLaw Kit ENew 2glece wing coaseralon Laaar bulk bqnea Laeer Hardwup 0 extra TG MFGU 857 High Mountain Rd North Halodon NJ 07508 427-3845 like 100-mAh cell OK lets Using same 1 5-minute timer allows us think 100-mAb capacity 400 milliamp-quarter-hour size Thus sets charge current 04 amps 15 minutes tank full Another aid doing think 100 milliamps hour milliamps milliamps hour As final example lets check out popular 800-mAh 08 Ah size becomes 800 mA hour mps mps 15 minutes Presto practice Ive written times personally rarely try fill tank because Im basically sport flier want minimize accidental overfill possible cell dam age So generalization normally charge about 90% full give take little always beginning empty cell/pack example use about 42 44 amps recharging 12s since 12 amps hour 24 amps 48 amps 90% 432 amps Also normally use three-amp charge current 15 minutes 800s hope helps some Geared cobalts Astro very popular because speed reduction corresponding torque increase allow larger props used model types fly much better way gears require some care feeding too heres tale woe illustrate anxious try geared cobalt new Caliph failed pay attention what doing haste forgot apply some grease per instructions gears after installed new set new cobalt purchased gears motor separately different times Well gears both metal lasted about three four flights started sounding like concrete mixer lack lube ruined gears meso caution learn keep em both clean carefully greased use small amount white lithium auto grease new Caliph see last months column continues please very much Ive some opportunity try different motors So far have flown Caliph Keller 25/12 pictured last month Astro geared 05 15 cobalts Kyosho geared 360PT Tower Hobbies has received very limited flight timemuch bad weatherand its premature report com parative results now will however tell two motors used rather unconven tionally Theres enough column space month go detail really want accumulate flight time first now let just tease First may recall May column indicated motors can very often used varied ways shown instructions magazine material matter Well thats just exactly sort thing Ive doing Caliph point Ill just say right prop selections Ive flying Caliph geared cobalt 05 12 cells economy geared Kyosho 360PT nine cells want accumulate experience combinations initial results rather exciting coming up meantime Ill just get some Caliph/installation photos may prove help ful planning new installation its some other model photo details small addition motor mounting technique described last month So far motor clamps made using Golden Rod inners yellow part Sullivan blue outer sheath/yellow inner control-rod set have worked very well technique has allowed easy interchange motors mentioned above has trouble-free except time prop hit ground landing happened 2 56 screw head washer clamp pulled through -in lite-ply motor mount floor What needed larger washer solution shown photos cut two strips thin -in-wide hobby store brass stock drilled 3A2-in holes line up versatile variety existing Caliph motor floor used strips giant washers So far have no problems Another photo shows modified steerable tail wheel installation dont like idea having tail wheel mounted rudder because thing use tape hinges Electrics see About Electrics part nine May 1984 issue MA case rudders shouldnt have take abuse installation tail wheel has its own internal fuselage-high brass-tubing bearing separate linkage rudder pushrod benefit addition strength attained individual adjustability throw both rudder steeringand favorite tape hinges re main unburdened Odds ends As reminder readers since continue askId like again encourage buy copy Mitch Polings book t Build Fly Electric-Powered Modeis book experienced Electric writer know published Kaim back very worth $995 selling price As Ive Indicated previous columns readers have reacted very intensely posi tively April offering motor specifica tions/standards idea Some readers apparently have thought about detail have come up penetrating questions like does motor voltage current rpm specifications tell us prop use Well certainly knew remained question wrote column intent follow up information covering matter So stay tuned Still upcoming sometime inexpen sively modify nifty Astro DC DC Super Charger make constant-current charger really works makes charging vastly controlled opportune Finally may wonder just important factor excess weight model airplane can let suggest simple experiment Take favorite familiar sport aerobatic Electricone used flying know well add weight Put about 10% 15 % weight CG fly things would ordinarily expect plane doand see what happens Betcha just aint same ol plane closing thought Try think geared motors Rather try think geared props effect gears belts adjust usable size prop motor motor motorit doesnt change later too Please send comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 Happy Silent Summer Flying Fun Everyone RC Giant Scale/de Vries Continued page 53 Big Bird get-togethers rallies fun-flies several among number take great pleasure exercising Giant Scale portion rule book seems theres now provisional International FAI class big uns can competition highest level Dolly didnt have enough time tell FM choseto adopt Australian rules Big Bird competition guess start Continued page 154 152 Model Aviation
Edition: Model Aviation - 1987/08
Page Numbers: 50, 51, 150, 152
Radio Control E lectrics Bob Kopski BAD NEWS going open months column will close brighter side Ive recently learned trying buy some Astro has discontinued venerable Part No 2102 05/075 economy can-motor has made new Electric fliers quite happy indeed very unfortunate Astro continues expands high-quality higher-cost line its famous cobalts has nothing offer folks just want give Electric try minimal initial invest ment word get Goldberg Electra/motor combination being received market very well tends support what Ive just said what said recent past regarding commonplace problem Which motor plane So no question cobalts top performers everyone starts out Cadillac now being big hole what can recommend ask about economy Electric am setting about find alternatives luck Ill have some good news near future must realize however its difficult costly buy try possibilities wont recommend something trying Furthermore have no personal requirement since seven Electrics cobalt-equipped Neverthe less Im helping want needto go easy firstbecause thats howl start out understand feeling Other columns articles readers may find interest have recently appeared other publications So consistent policy trying pass much information possible some references Bob Aberle prolific writer varied work appears mainly Flying Models two Electric offerings interest April issue magazine first EMF sportpylon design configured economy motors EMF pretty T-tail article has lots good-quality detail photos Bobs other offering issue has care feeding flying 50-mAh Yes 50 receiver Ni-Cd packs small packs seem well-suited small Electrics would think hand-launched RC Sailplanes AMA Class Next no sooner May MA appeared column discussed some aspects pod-mounted motors same subject also appeared May issue Model Builder issue Electric Power columnist Mitch Poling interesting offerings same subject encourage interested motor-on-pod idea check out reference Finally what Im sure also good friendly spirit helping others Silent Power columnist Bob Sliff dedicated allotted space May issue ofRCM showing feels best beginning Electric fliers 50 Model Aviation Looking open hatch Bobs new Davey Systems Caliph Area just behind motor mount Hardware visible inciudes fuse Jomar SC-4 motor controi B arming switch various connectorseach chosen job done SC-4s MOSFETs mounted siuminum plate screwed baisa ralis Heres aii power piant works went Caiiph three basic sections 1 2-ceil 800 mAh battery pack control center motor Connectors used inciude insuieted crimp-type wire nut Sermos high-amp easy motor exchange Personalized Caiiph tail wheel instaiiation piece fuseiagehigh brasatubing inside seves bushing forthe 1/16-in wire tail wheel strut Just underthe stab can see thetwo wheel collarswhich secure strut lowercollar fitted short440 threaded rod holds screw-on ball-link wire rudder pushrod connected via Goldberg aileron coupler No 246 Everything fully adjustable removable Hole bottom fuselage cooling-air exit start out new venture selection very best costly equipment Truly different strokes different folks On/Off switches have discussed times places References MA include February 1984 January 1985 August 1986 have personally routinely using servo-driven toggle switches micro switches motor control years past have recommended Radio Shacks Part No 275-016 Lever Switch microswitch purpose Well days essentially gonenot because fault product because evolution power/motor systems see early days Electric motor designs favored higher-voltage greater cell count lower-current smaller cell size opera tion still favorite appli cations recent years however operating parameter preferences have reversed domestic contemporary motors con figured relatively lower-voltage highercurrent operation tiny Radio Shack switch simply cant handle higher above 10 amps current reliably So keeping times now generally encourage using larger micro switch particular Im now using Astro Continued page 150 MAGNIFICENT HIGH TECHNOLOGY AVIATION ART F-ill Warsaw PactF-ill Sunrise Detailed screen printed designs brilliant colors FRONT BACK ot BLACK premium weight USA made t-shirts Sizes S M L XLCatalog $1 00 Dynamic cap designs clearly Leading Edge Technology' Cap size adjustable size fits Available Shins two-sided $1295 AIF-4 F-la8-1SR-7i C-S F-14 Nightmare F-i4 A-78-52F-ill C-130 F-ill Terrorize F-iS A-joT-38KC-135 C-141 F-18 Shijie F-is AH-iM-l8-52 Arms Deal Available Shins one-sided $1095 F-i ii Libyan SunriseF-i ii Warsaw Pact 8-52 Reach Out8-52 Send Best Minimum 24 Shirt Order $250 off shirt Available Caps $795 F-iSSR-71B-25P-47Space Shuttle F-iS8-188-29ZeroTop Gun Minimum 24 Cap Order $150 off cap ShippingFirstEa Addi Shin/CapShirt/Cap USA$200$ 50 Canada$350$100 Other$550$150 Delivery Allow 2 3 weeks MENISA ORDERS CALt TOLL FREE 247-1728 Eat 8 Inside TX Customer Call 19151 695-09i8 Ext 2 Tesas customers add 6/5k tan No COOs send order check including shipping charges PACIFIC COAST OF TEXAS 2917 Robertson Dr. Dept 16 Abtlene TX 79606 ATT- CHEK7 ON-Board Battery Tester Saves Time. Saves Models Install RO Models Check receiver battery status press button Small Light /2 oz Precise Rugged BAlT-CHEK RX-1ORDER TODAY $1495at dealer Protune Corp 19141 462-6452 USAPO Box 1808 Poughkeepsie NY 12601 Capacitive Discharge Ignition CH Electronics Breakerless CD ignition System can installed engine o 15 large choinsaw type new 90 15 two four stroke engines perfect converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler 8 develops power.plus no kickback & very low idle CH system used engine expertsMaynard Hill George Aldridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kita available popular engines Custom engine set-up availabie Call write price quote Now IETC electronic timing control information brochure price list send $100 Box 1732 Riverton WY 82501 CH Electronics Phone 307-857-6897 NW August1987 51 closer look business end Bobs Caliph photos last months column Above see largeair intakes Air flows through fuselage cool motor speed controller heat sink batteries Note Golden Rod Inners looped over motor clamp place Photo below shows underside motor mounting plate Rectangular metal pieces washers under heads 2 56 screws secure ends Golden Rod motor clamps Astro geared cobalt same motor other photo Dodgson has new construction videotapes ready shipment Bobs Tape No came out last winter showed beautiful flying shots four planes produces design philos ophy New tape No 2 shows Dave Banks wing construction sequences runs two hours Tape No 3 shows fuselage construction linkage layouts 90 minutes havent seen new tapes Id imagine would invaluable anyone buildingor thinking buildingone Bobs kits refundable deposit $15 $30 $40 depending whether order two three tapes time Shipping handling $10 $15 $20 making total $25 $45 $60 Other news Bob extra $45 will partially pre-build fuselage new Windsong Camano Pixie Formers bulk heads elevator bearings nose wing saddle plywood decking installed rein forced called plans work done jig fuselage locked perfect alignment Bob also says business going great add help get backlog down manageable level Bobs address 21230 Damson Road Bothell WA 98021 phone number 206 776-8067 Valley Forges Fifth Annual Sailplane Contest will held August 15-16 site Valley Forge Signal Seekers flying field near King Prussia PA Sportsman Expert Junior will flown both class D class B both days Hand-Launch class event will flown both days Sport Scale Sunday biggest contests East hear its well-run lot fun CD will Fran Olix also Soaring CD Ehe Nats year info write Fran 764 Alexander Drive Hatfield PA 19440 phone 215 341-6713 day time 361-9516 evenings end column month Id like share contents note sent Mrs Mary Holley addressed Sailplaners expressed sympathy Dwights passing last December Model Soaring large part Dwights life know acknowledgement accomplishments type Champion would mean great deal himas does Bryon Blakeslee 3134 Winnebago Dr Sedalia CO 80135 Please enclose SASE responses SEND SASE FOR LITERATURE SHEETS Its also true instructors created equal Some people can fly own airplanes just fine cant teach others really good instructor can dramatically shorten training time student Now get tough onethe trainer airplane As mentioned earlier key learn ing fly RC keeping airplane piece good student has good instructor buddy-box needs entirely different airplane poor student no instructor powered Glider good choice trainer airplane students slow learners have poor/no instructors and/or no buddy-box type airplane inherently stable can often fly itself out trouble much easier fly land because moves relatively slowly novice pilot has better chance keep up aircrafts motion permits student time evaluate orientation airplane figure out what wing loading usually fairly low often allows survive crashes good shape wouldnt everyone want learn fly using powered Glider Well depending abilities novice pilot instructor availability buddy-box some students will learn lot faster others Pilots seldom use powered Glider type trainer-airplane much radio check airplane after learn fly So move advanced trainer much like airplane other proponents would have recommended start out means investment money long run its wasted pilot can learn fly quickly Having said Id straddle both sides issue must add beginner can decide airplane best satisfies training situation hes found himself Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 RC Electrics/Kopski Continued page 51 Part No 4032 priced $6 Cell size just mentioned above since readers experience some confusion difficulty dimension thought Id offer some additional information Before con tinuing may want reference April 87 MA column same subject 36 Cell size generally expressed either ampere-hours milliampere-hours expressions simply refer amount charge cell capable accepting delivering ie big tank electrically As example popular 12 Ah ampere hour cell can expected deliver about 12 amps hour 012 amps 10 hours such total current-time product So sixminute ho-hour motor run flight average motor current would have 12 amperes completely drain cell assuming started fully charged pack because 12 amps x Yo hour mpere-hours course cell capacity can also expressed minutes Thus same 1 2-Ah cellor pack can said have 72 ampere-minute capacity since 60 minutes hour 12 x 60 ust portion size description identifies time-factor can expressed way also can part describes electric current Thus 1 2-Ah example can also described having 1200 milliampere-hour capacity since 1000 milliamperes ampere Miii means 4ooosee July 1985 issue MA Combining above could call example 72000 milliampere-minute cell pack Well little cumbersome routinely used expression However does serve additional illustration idea cell size Great say what use Well lets say wanted fast-charge rather small motor pack Free Flight Electric Lets say using 250-mAh cells wanted charge 15 minutesthe longest period can set time-switch charger question comes up much charge current should used Remember doesnt matter cells areonly cells pack must same size obviously way look question approach realize 250 mAh one-quarter ampere-hour since 250/1000 could charge 1/4 ampere 250 milliamps hourbut thats four individual turns 15-minute hour charger-timer knob Since really want job just timer-knob turn charging has done four times faster Clearly example would charge 4 x 250 mulliamps 4 x amp amp 15 minutes Again 1 amp x 15 minutes p x ere-hour 250/1000 ampere-hour milliampere hours about something uneven Continued page 152 150 Model Aviation r3/4 SCALE CLASSICSHigh Performance Rubber Powered $1795 / KORDA 33___________ DEALER AND DISTRI BUTOR_________ INOUIRES INVITED PLUS 8 MORE RUBBER POWERED MODELS KIT INCLUDES FOLDING PROP MATERIALS SELECT WOODS FULL SIZE PLAN CLOUD 33 R/NmocielsPouox 5059ALAMOGORDO NM 88311 CLODHOPPER RC Aerobatics/Van Putte Continued page 49 responding advertIsers mention read about ModelAviation EiDer LiWNKUBE WUUZ WeSiyfOWOijat agiaiNew Prop Adapter far Byron 4 or3 bledqdiirop ANEgI. Complete Fits Sache engine wltn7lS bolt pattern 5 Neffibg Extra uuy 31 -*325 37- W200fformulypoatg S49 34-flU42-*420 Glees body Opifee aeA5fagleea wheal pants TlwotJecoupled cowl apark advancefoam wing aN balaa Included A-Uba2oa-SNP27-tlbe4ozPIHP42IIbaSoi7HP Tfar Sinai Carburetor Unkage CDI Ignition ICH ElectronloeL 45 Volt Ignition Pad Safety Switch S Bolt Hub Realator Spark Plugs 1 Watrantyon Faulty Parts end WorknianablpLaw Kit ENew 2glece wing coaseralon Laaar bulk bqnea Laeer Hardwup 0 extra TG MFGU 857 High Mountain Rd North Halodon NJ 07508 427-3845 like 100-mAh cell OK lets Using same 1 5-minute timer allows us think 100-mAb capacity 400 milliamp-quarter-hour size Thus sets charge current 04 amps 15 minutes tank full Another aid doing think 100 milliamps hour milliamps milliamps hour As final example lets check out popular 800-mAh 08 Ah size becomes 800 mA hour mps mps 15 minutes Presto practice Ive written times personally rarely try fill tank because Im basically sport flier want minimize accidental overfill possible cell dam age So generalization normally charge about 90% full give take little always beginning empty cell/pack example use about 42 44 amps recharging 12s since 12 amps hour 24 amps 48 amps 90% 432 amps Also normally use three-amp charge current 15 minutes 800s hope helps some Geared cobalts Astro very popular because speed reduction corresponding torque increase allow larger props used model types fly much better way gears require some care feeding too heres tale woe illustrate anxious try geared cobalt new Caliph failed pay attention what doing haste forgot apply some grease per instructions gears after installed new set new cobalt purchased gears motor separately different times Well gears both metal lasted about three four flights started sounding like concrete mixer lack lube ruined gears meso caution learn keep em both clean carefully greased use small amount white lithium auto grease new Caliph see last months column continues please very much Ive some opportunity try different motors So far have flown Caliph Keller 25/12 pictured last month Astro geared 05 15 cobalts Kyosho geared 360PT Tower Hobbies has received very limited flight timemuch bad weatherand its premature report com parative results now will however tell two motors used rather unconven tionally Theres enough column space month go detail really want accumulate flight time first now let just tease First may recall May column indicated motors can very often used varied ways shown instructions magazine material matter Well thats just exactly sort thing Ive doing Caliph point Ill just say right prop selections Ive flying Caliph geared cobalt 05 12 cells economy geared Kyosho 360PT nine cells want accumulate experience combinations initial results rather exciting coming up meantime Ill just get some Caliph/installation photos may prove help ful planning new installation its some other model photo details small addition motor mounting technique described last month So far motor clamps made using Golden Rod inners yellow part Sullivan blue outer sheath/yellow inner control-rod set have worked very well technique has allowed easy interchange motors mentioned above has trouble-free except time prop hit ground landing happened 2 56 screw head washer clamp pulled through -in lite-ply motor mount floor What needed larger washer solution shown photos cut two strips thin -in-wide hobby store brass stock drilled 3A2-in holes line up versatile variety existing Caliph motor floor used strips giant washers So far have no problems Another photo shows modified steerable tail wheel installation dont like idea having tail wheel mounted rudder because thing use tape hinges Electrics see About Electrics part nine May 1984 issue MA case rudders shouldnt have take abuse installation tail wheel has its own internal fuselage-high brass-tubing bearing separate linkage rudder pushrod benefit addition strength attained individual adjustability throw both rudder steeringand favorite tape hinges re main unburdened Odds ends As reminder readers since continue askId like again encourage buy copy Mitch Polings book t Build Fly Electric-Powered Modeis book experienced Electric writer know published Kaim back very worth $995 selling price As Ive Indicated previous columns readers have reacted very intensely posi tively April offering motor specifica tions/standards idea Some readers apparently have thought about detail have come up penetrating questions like does motor voltage current rpm specifications tell us prop use Well certainly knew remained question wrote column intent follow up information covering matter So stay tuned Still upcoming sometime inexpen sively modify nifty Astro DC DC Super Charger make constant-current charger really works makes charging vastly controlled opportune Finally may wonder just important factor excess weight model airplane can let suggest simple experiment Take favorite familiar sport aerobatic Electricone used flying know well add weight Put about 10% 15 % weight CG fly things would ordinarily expect plane doand see what happens Betcha just aint same ol plane closing thought Try think geared motors Rather try think geared props effect gears belts adjust usable size prop motor motor motorit doesnt change later too Please send comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 Happy Silent Summer Flying Fun Everyone RC Giant Scale/de Vries Continued page 53 Big Bird get-togethers rallies fun-flies several among number take great pleasure exercising Giant Scale portion rule book seems theres now provisional International FAI class big uns can competition highest level Dolly didnt have enough time tell FM choseto adopt Australian rules Big Bird competition guess start Continued page 154 152 Model Aviation
Edition: Model Aviation - 1987/08
Page Numbers: 50, 51, 150, 152
Radio Control E lectrics Bob Kopski BAD NEWS going open months column will close brighter side Ive recently learned trying buy some Astro has discontinued venerable Part No 2102 05/075 economy can-motor has made new Electric fliers quite happy indeed very unfortunate Astro continues expands high-quality higher-cost line its famous cobalts has nothing offer folks just want give Electric try minimal initial invest ment word get Goldberg Electra/motor combination being received market very well tends support what Ive just said what said recent past regarding commonplace problem Which motor plane So no question cobalts top performers everyone starts out Cadillac now being big hole what can recommend ask about economy Electric am setting about find alternatives luck Ill have some good news near future must realize however its difficult costly buy try possibilities wont recommend something trying Furthermore have no personal requirement since seven Electrics cobalt-equipped Neverthe less Im helping want needto go easy firstbecause thats howl start out understand feeling Other columns articles readers may find interest have recently appeared other publications So consistent policy trying pass much information possible some references Bob Aberle prolific writer varied work appears mainly Flying Models two Electric offerings interest April issue magazine first EMF sportpylon design configured economy motors EMF pretty T-tail article has lots good-quality detail photos Bobs other offering issue has care feeding flying 50-mAh Yes 50 receiver Ni-Cd packs small packs seem well-suited small Electrics would think hand-launched RC Sailplanes AMA Class Next no sooner May MA appeared column discussed some aspects pod-mounted motors same subject also appeared May issue Model Builder issue Electric Power columnist Mitch Poling interesting offerings same subject encourage interested motor-on-pod idea check out reference Finally what Im sure also good friendly spirit helping others Silent Power columnist Bob Sliff dedicated allotted space May issue ofRCM showing feels best beginning Electric fliers 50 Model Aviation Looking open hatch Bobs new Davey Systems Caliph Area just behind motor mount Hardware visible inciudes fuse Jomar SC-4 motor controi B arming switch various connectorseach chosen job done SC-4s MOSFETs mounted siuminum plate screwed baisa ralis Heres aii power piant works went Caiiph three basic sections 1 2-ceil 800 mAh battery pack control center motor Connectors used inciude insuieted crimp-type wire nut Sermos high-amp easy motor exchange Personalized Caiiph tail wheel instaiiation piece fuseiagehigh brasatubing inside seves bushing forthe 1/16-in wire tail wheel strut Just underthe stab can see thetwo wheel collarswhich secure strut lowercollar fitted short440 threaded rod holds screw-on ball-link wire rudder pushrod connected via Goldberg aileron coupler No 246 Everything fully adjustable removable Hole bottom fuselage cooling-air exit start out new venture selection very best costly equipment Truly different strokes different folks On/Off switches have discussed times places References MA include February 1984 January 1985 August 1986 have personally routinely using servo-driven toggle switches micro switches motor control years past have recommended Radio Shacks Part No 275-016 Lever Switch microswitch purpose Well days essentially gonenot because fault product because evolution power/motor systems see early days Electric motor designs favored higher-voltage greater cell count lower-current smaller cell size opera tion still favorite appli cations recent years however operating parameter preferences have reversed domestic contemporary motors con figured relatively lower-voltage highercurrent operation tiny Radio Shack switch simply cant handle higher above 10 amps current reliably So keeping times now generally encourage using larger micro switch particular Im now using Astro Continued page 150 MAGNIFICENT HIGH TECHNOLOGY AVIATION ART F-ill Warsaw PactF-ill Sunrise Detailed screen printed designs brilliant colors FRONT BACK ot BLACK premium weight USA made t-shirts Sizes S M L XLCatalog $1 00 Dynamic cap designs clearly Leading Edge Technology' Cap size adjustable size fits Available Shins two-sided $1295 AIF-4 F-la8-1SR-7i C-S F-14 Nightmare F-i4 A-78-52F-ill C-130 F-ill Terrorize F-iS A-joT-38KC-135 C-141 F-18 Shijie F-is AH-iM-l8-52 Arms Deal Available Shins one-sided $1095 F-i ii Libyan SunriseF-i ii Warsaw Pact 8-52 Reach Out8-52 Send Best Minimum 24 Shirt Order $250 off shirt Available Caps $795 F-iSSR-71B-25P-47Space Shuttle F-iS8-188-29ZeroTop Gun Minimum 24 Cap Order $150 off cap ShippingFirstEa Addi Shin/CapShirt/Cap USA$200$ 50 Canada$350$100 Other$550$150 Delivery Allow 2 3 weeks MENISA ORDERS CALt TOLL FREE 247-1728 Eat 8 Inside TX Customer Call 19151 695-09i8 Ext 2 Tesas customers add 6/5k tan No COOs send order check including shipping charges PACIFIC COAST OF TEXAS 2917 Robertson Dr. Dept 16 Abtlene TX 79606 ATT- CHEK7 ON-Board Battery Tester Saves Time. Saves Models Install RO Models Check receiver battery status press button Small Light /2 oz Precise Rugged BAlT-CHEK RX-1ORDER TODAY $1495at dealer Protune Corp 19141 462-6452 USAPO Box 1808 Poughkeepsie NY 12601 Capacitive Discharge Ignition CH Electronics Breakerless CD ignition System can installed engine o 15 large choinsaw type new 90 15 two four stroke engines perfect converting CH Ignition system new kits plans airplanes just becoming available perfect size engine Four stroke engines beautiful ign Detonation death four stroke enginewhen control engine timing can stop detonation makes engine run much cooler 8 develops power.plus no kickback & very low idle CH system used engine expertsMaynard Hill George Aldridge Doran Hiatt Cliff Bennett Otto Bernhart Maynard Hill used CH system last two world records Available two four stroke engines single twin cylinder Throttle Coupled Spark Advance kita available popular engines Custom engine set-up availabie Call write price quote Now IETC electronic timing control information brochure price list send $100 Box 1732 Riverton WY 82501 CH Electronics Phone 307-857-6897 NW August1987 51 closer look business end Bobs Caliph photos last months column Above see largeair intakes Air flows through fuselage cool motor speed controller heat sink batteries Note Golden Rod Inners looped over motor clamp place Photo below shows underside motor mounting plate Rectangular metal pieces washers under heads 2 56 screws secure ends Golden Rod motor clamps Astro geared cobalt same motor other photo Dodgson has new construction videotapes ready shipment Bobs Tape No came out last winter showed beautiful flying shots four planes produces design philos ophy New tape No 2 shows Dave Banks wing construction sequences runs two hours Tape No 3 shows fuselage construction linkage layouts 90 minutes havent seen new tapes Id imagine would invaluable anyone buildingor thinking buildingone Bobs kits refundable deposit $15 $30 $40 depending whether order two three tapes time Shipping handling $10 $15 $20 making total $25 $45 $60 Other news Bob extra $45 will partially pre-build fuselage new Windsong Camano Pixie Formers bulk heads elevator bearings nose wing saddle plywood decking installed rein forced called plans work done jig fuselage locked perfect alignment Bob also says business going great add help get backlog down manageable level Bobs address 21230 Damson Road Bothell WA 98021 phone number 206 776-8067 Valley Forges Fifth Annual Sailplane Contest will held August 15-16 site Valley Forge Signal Seekers flying field near King Prussia PA Sportsman Expert Junior will flown both class D class B both days Hand-Launch class event will flown both days Sport Scale Sunday biggest contests East hear its well-run lot fun CD will Fran Olix also Soaring CD Ehe Nats year info write Fran 764 Alexander Drive Hatfield PA 19440 phone 215 341-6713 day time 361-9516 evenings end column month Id like share contents note sent Mrs Mary Holley addressed Sailplaners expressed sympathy Dwights passing last December Model Soaring large part Dwights life know acknowledgement accomplishments type Champion would mean great deal himas does Bryon Blakeslee 3134 Winnebago Dr Sedalia CO 80135 Please enclose SASE responses SEND SASE FOR LITERATURE SHEETS Its also true instructors created equal Some people can fly own airplanes just fine cant teach others really good instructor can dramatically shorten training time student Now get tough onethe trainer airplane As mentioned earlier key learn ing fly RC keeping airplane piece good student has good instructor buddy-box needs entirely different airplane poor student no instructor powered Glider good choice trainer airplane students slow learners have poor/no instructors and/or no buddy-box type airplane inherently stable can often fly itself out trouble much easier fly land because moves relatively slowly novice pilot has better chance keep up aircrafts motion permits student time evaluate orientation airplane figure out what wing loading usually fairly low often allows survive crashes good shape wouldnt everyone want learn fly using powered Glider Well depending abilities novice pilot instructor availability buddy-box some students will learn lot faster others Pilots seldom use powered Glider type trainer-airplane much radio check airplane after learn fly So move advanced trainer much like airplane other proponents would have recommended start out means investment money long run its wasted pilot can learn fly quickly Having said Id straddle both sides issue must add beginner can decide airplane best satisfies training situation hes found himself Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 RC Electrics/Kopski Continued page 51 Part No 4032 priced $6 Cell size just mentioned above since readers experience some confusion difficulty dimension thought Id offer some additional information Before con tinuing may want reference April 87 MA column same subject 36 Cell size generally expressed either ampere-hours milliampere-hours expressions simply refer amount charge cell capable accepting delivering ie big tank electrically As example popular 12 Ah ampere hour cell can expected deliver about 12 amps hour 012 amps 10 hours such total current-time product So sixminute ho-hour motor run flight average motor current would have 12 amperes completely drain cell assuming started fully charged pack because 12 amps x Yo hour mpere-hours course cell capacity can also expressed minutes Thus same 1 2-Ah cellor pack can said have 72 ampere-minute capacity since 60 minutes hour 12 x 60 ust portion size description identifies time-factor can expressed way also can part describes electric current Thus 1 2-Ah example can also described having 1200 milliampere-hour capacity since 1000 milliamperes ampere Miii means 4ooosee July 1985 issue MA Combining above could call example 72000 milliampere-minute cell pack Well little cumbersome routinely used expression However does serve additional illustration idea cell size Great say what use Well lets say wanted fast-charge rather small motor pack Free Flight Electric Lets say using 250-mAh cells wanted charge 15 minutesthe longest period can set time-switch charger question comes up much charge current should used Remember doesnt matter cells areonly cells pack must same size obviously way look question approach realize 250 mAh one-quarter ampere-hour since 250/1000 could charge 1/4 ampere 250 milliamps hourbut thats four individual turns 15-minute hour charger-timer knob Since really want job just timer-knob turn charging has done four times faster Clearly example would charge 4 x 250 mulliamps 4 x amp amp 15 minutes Again 1 amp x 15 minutes p x ere-hour 250/1000 ampere-hour milliampere hours about something uneven Continued page 152 150 Model Aviation r3/4 SCALE CLASSICSHigh Performance Rubber Powered $1795 / KORDA 33___________ DEALER AND DISTRI BUTOR_________ INOUIRES INVITED PLUS 8 MORE RUBBER POWERED MODELS KIT INCLUDES FOLDING PROP MATERIALS SELECT WOODS FULL SIZE PLAN CLOUD 33 R/NmocielsPouox 5059ALAMOGORDO NM 88311 CLODHOPPER RC Aerobatics/Van Putte Continued page 49 responding advertIsers mention read about ModelAviation EiDer LiWNKUBE WUUZ WeSiyfOWOijat agiaiNew Prop Adapter far Byron 4 or3 bledqdiirop ANEgI. Complete Fits Sache engine wltn7lS bolt pattern 5 Neffibg Extra uuy 31 -*325 37- W200fformulypoatg S49 34-flU42-*420 Glees body Opifee aeA5fagleea wheal pants TlwotJecoupled cowl apark advancefoam wing aN balaa Included A-Uba2oa-SNP27-tlbe4ozPIHP42IIbaSoi7HP Tfar Sinai Carburetor Unkage CDI Ignition ICH ElectronloeL 45 Volt Ignition Pad Safety Switch S Bolt Hub Realator Spark Plugs 1 Watrantyon Faulty Parts end WorknianablpLaw Kit ENew 2glece wing coaseralon Laaar bulk bqnea Laeer Hardwup 0 extra TG MFGU 857 High Mountain Rd North Halodon NJ 07508 427-3845 like 100-mAh cell OK lets Using same 1 5-minute timer allows us think 100-mAb capacity 400 milliamp-quarter-hour size Thus sets charge current 04 amps 15 minutes tank full Another aid doing think 100 milliamps hour milliamps milliamps hour As final example lets check out popular 800-mAh 08 Ah size becomes 800 mA hour mps mps 15 minutes Presto practice Ive written times personally rarely try fill tank because Im basically sport flier want minimize accidental overfill possible cell dam age So generalization normally charge about 90% full give take little always beginning empty cell/pack example use about 42 44 amps recharging 12s since 12 amps hour 24 amps 48 amps 90% 432 amps Also normally use three-amp charge current 15 minutes 800s hope helps some Geared cobalts Astro very popular because speed reduction corresponding torque increase allow larger props used model types fly much better way gears require some care feeding too heres tale woe illustrate anxious try geared cobalt new Caliph failed pay attention what doing haste forgot apply some grease per instructions gears after installed new set new cobalt purchased gears motor separately different times Well gears both metal lasted about three four flights started sounding like concrete mixer lack lube ruined gears meso caution learn keep em both clean carefully greased use small amount white lithium auto grease new Caliph see last months column continues please very much Ive some opportunity try different motors So far have flown Caliph Keller 25/12 pictured last month Astro geared 05 15 cobalts Kyosho geared 360PT Tower Hobbies has received very limited flight timemuch bad weatherand its premature report com parative results now will however tell two motors used rather unconven tionally Theres enough column space month go detail really want accumulate flight time first now let just tease First may recall May column indicated motors can very often used varied ways shown instructions magazine material matter Well thats just exactly sort thing Ive doing Caliph point Ill just say right prop selections Ive flying Caliph geared cobalt 05 12 cells economy geared Kyosho 360PT nine cells want accumulate experience combinations initial results rather exciting coming up meantime Ill just get some Caliph/installation photos may prove help ful planning new installation its some other model photo details small addition motor mounting technique described last month So far motor clamps made using Golden Rod inners yellow part Sullivan blue outer sheath/yellow inner control-rod set have worked very well technique has allowed easy interchange motors mentioned above has trouble-free except time prop hit ground landing happened 2 56 screw head washer clamp pulled through -in lite-ply motor mount floor What needed larger washer solution shown photos cut two strips thin -in-wide hobby store brass stock drilled 3A2-in holes line up versatile variety existing Caliph motor floor used strips giant washers So far have no problems Another photo shows modified steerable tail wheel installation dont like idea having tail wheel mounted rudder because thing use tape hinges Electrics see About Electrics part nine May 1984 issue MA case rudders shouldnt have take abuse installation tail wheel has its own internal fuselage-high brass-tubing bearing separate linkage rudder pushrod benefit addition strength attained individual adjustability throw both rudder steeringand favorite tape hinges re main unburdened Odds ends As reminder readers since continue askId like again encourage buy copy Mitch Polings book t Build Fly Electric-Powered Modeis book experienced Electric writer know published Kaim back very worth $995 selling price As Ive Indicated previous columns readers have reacted very intensely posi tively April offering motor specifica tions/standards idea Some readers apparently have thought about detail have come up penetrating questions like does motor voltage current rpm specifications tell us prop use Well certainly knew remained question wrote column intent follow up information covering matter So stay tuned Still upcoming sometime inexpen sively modify nifty Astro DC DC Super Charger make constant-current charger really works makes charging vastly controlled opportune Finally may wonder just important factor excess weight model airplane can let suggest simple experiment Take favorite familiar sport aerobatic Electricone used flying know well add weight Put about 10% 15 % weight CG fly things would ordinarily expect plane doand see what happens Betcha just aint same ol plane closing thought Try think geared motors Rather try think geared props effect gears belts adjust usable size prop motor motor motorit doesnt change later too Please send comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 Happy Silent Summer Flying Fun Everyone RC Giant Scale/de Vries Continued page 53 Big Bird get-togethers rallies fun-flies several among number take great pleasure exercising Giant Scale portion rule book seems theres now provisional International FAI class big uns can competition highest level Dolly didnt have enough time tell FM choseto adopt Australian rules Big Bird competition guess start Continued page 154 152 Model Aviation