Radio Control E lectrics Bob Kopski Please send comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 REGULAR READERS will recognize above opening regular closing Nothis zero-length column just seems some read ers never get end column because incoming mail comes directly some comes via Model Aviation editorial office good folks MA forward mail sent can get faster ans wers using home address above Besides itll save folks AMA HQ some work Nuff said Charger modification follow-up snafu occurred article Sep tember issue As can imagine number folks have contacted about Mods DC/DC Super Charger article appeared September 1987 issue MAcomplete major built-in error errormislabeling two places Figure 4 page 83was corrected two places October 1987 issue namely Letters Editor column regular column Some folks contacted before Octo ber issue came out got corrected info sooner Some wrote called say modified charger worked just fine corrections made Im happy say far no has openly angry trouble Fred Ewings Amptique Front end shot above shows added air scoop increases cool ing air flow battery Dont forget increase size air exit tool Planes interior Below reveals Leisure LT5O geared motor heat sink Jomar SC5 speed control charge jack arming switch connectors Speed control PC board attached fuselage side sticky-backed Velcro strips Fred extended fuselage structure cover gear box 48 Model Aviation Amptique built KRC club use prize recent Electric 1-lY OD says kit excellent Parts fit perfectly Wing struc ture includes shear webs false ribs diagonal braces light weight rigidity Modified landing gear mount L uses kit former wire held #2 sheet metal screws nylon clamps Install gear after model complete Leave slot bottom sheeting ac cess screws through motor-mount hole through access hatch Fuselage construction easier gear way Some connectors discussed text Top-to-Bottom Sermos Snap Tamiya large Molex small gold-pin Molex 5C5 speed-control dIsconnect experiencedalthough couldnt blame error caused MUCH personal grief am very grateful pa tience understanding Thank very much new nickel-cadmium cell way has just announced Sanyo Its called Extra cell label includes letters SCE new product series offers 40% performance should readily avail able late spring 1988 Specifically SCE designated cells will offer 40% ca pacity ampere-hours previous cells same cell physical size importantly extra capacity comes almost no increase weight As specific example popular 1200 SC 12 Ah weighs 177 ox new Sanyo Extra same physical dimensions will labeled 1700 SCE 17 Ah weigh 187 oz latter cell has 55 milliohnis internal resis tance compared 42 niilliohms famil iar SC means newer will have relatively higher internal losses heating losses small compared increased capacity Sanyo will offer new cells familiar sizes whether youre flying 1200s 900s 800s youll able directly substitute new ones cost About 35% youre used payingnot bad cause 40% ca pacity 35% coins get moneys worth expect try out some samples near fu ture Ill able pass along some firsthand info few months Meanwhile Ill just con tinue happily flying eight Electricsall 100% Sanyo-powered83 cells total air counting spare packsof sizes Graupner Electric products readily avail able Hobby Lobby extensive cata log listing other modeling products best part catalog free can check Advertisers Index back magazine get back Electric stuff local flier has just completed Silentius Electric Sailplane powered recom mended Graupner gear drive power system system uses extension shaft between motor Continued page 148 Best Europe s leading manufacturer Pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include Helmets les Sun Glasses Bobble Hats Baseball Caps Floppy Hats Bone Domes Oxygen Masks Maewests popular types WW WW II sports one-piece suit stripes j lall colorsl NATO one-piece suit map pockets lolive greenl glider pilots turtle neck sweaters floppy hat sun glasses Standard pilot tan pants simulated leather jacket fur collar baseball cap sun glasses pilots lightest ever come painted dressed ready fly 1/4 Scale 0 Plus $500 postag handling 1/ Scale 0 airmail Have fun 1A Scale parachutist ram chute rip-stop nylon ready servos Takes standard flight pack makes $9000 Plus $10 Postage Handling Easy Ordering t delivery send phone VISA MasterCard Number AH DESIGNS 81 OLD WORKSHOPS FFORDDDERWEN CL WYD UK 2YR New Fourmost Products Cooney Gapless Hinge 45 0 New Improved Cooney Gapless Hinge added strength new white color easy stall hinge Gapless Hinge extrud ed strip polyurethane completely fuelproof forms perfectly gapless con trol surface seal greatly creases areodynamic efficiency Available two sizes Small 1/8 1/4 Large 1/4 larger Price $350 per 3 ft length information about Cooney Gapless Hinges other innovative model products Fourmost send stamped self-addressed business size envelope FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97116 503 357-2732 December 1987 49 1/ Scale Scale CHALLENGE ENGINEERING POBax 67 New Baden Texas 77870 409 828-3105 NOW AVAILABLE AGAIN IN THE UNITED *CLARK AIRSCREW Need rs Choice Standard Propssolid Hard Birch FROM 12 inch THROUGH 28 inch DIAMETER WW-l Sopwith Camel Pro ps. FROM 17 inch THROUGH 20 inch DIAMETER Birch Laminated Maple/Cherry DEALER INQUIRIES INVITED STATES OF AMERICA PRO4LER THE CIAAIDBCREW CCZiCZiZ Model Aircraft Supply 2521 Bluff Road Traverse City Michigan 49684 Send SASE Price Ilatllnformation 1-616-947-8562 Z RC Electrics/Kopski Continued page 49 prop drive motor may mounted closer center-of-gravity plane frontal fuselage area can re duced just needed prop bearing hub saw maiden flightand several since thenand plane flew very impressively such relatively economical package subject Hobby Lobbys Graup ncr systems supplies Jim Martinhead mod eler HLtells Graupner 1200 mAh packs have recently re-rated 1400 mAh capacity no price increase Items other Graupner brand include stretched-wing Electric version Prontoone all-time favor ite Gas models Yes used play goo too Anyway theres lots things catalog rest up Mitch Polings book Build Fly Elec tric Powered Model Aircraft has mentioned several times regular column Mitch Electric columnist Model Builder magazine Ive mentioned book pub lished Kalmbach failed include neces sary mail order information Ive paid pricelots individual letters asking So get Mitchs bookwhich recommend write Kaimbach Books 1027 North Seventh Street Milwaukee WI 53233 cost $995 plus $1 postage handling Leisure Amptiquemore well-known Keith Shaw Ann Arbor MI told pleased Leisure Amptique passed along some conversation Sep tember 1987 issue MA Since time Ive opportunity fly Amptiques other folks also build fly self WellKeith perfectly right always isthe Amptique great flier uncondition ally wholeheartedly recommend either plane just try Electric stuff out first-time RC flight trainer model Amptique very graceful forgiving fliera delight air effect its sort low-aspect Electric powered glider wheels easily ROGs low- moderate-priced power systems flew equipped Leisure LT-50 251 geared motor seven 800 mAh cells 10 x 6 prop Another used Ky osho 360 PT gear drive unit Kyosho 9 x 8 Etude prop 800 mAh cells Both installations equipped Jomar SC-S speed controls necessities added greatly flying enjoyment back built kit best kit Ive ever built Everything fit per fectly wood excellentI substituted piece cause broke Others Ive spoken have built Amptique equally vocal praising kit quality would build fly Cause its part prize given away upcoming KRC Electric Fly Its now scheduled August 31long since past time read fortunate enough get kit Leisure stock gear drive system donation some club members joined forces make Amptique ARF available some very lucky person may now reading Anyway built framework John Hickey cov ered Fred Ewing has Amptique flying building second did installa tion can hardly wait see winners reac tion Now back plane itself accumu lated local experience few possible re finements personalizations may interest First some may find wing dowels just tad shortso substituting somewhat longer ones will help hold wing rubbers easily Second noticed very high heat summer made impossible keep batter ies cool stock cooling system fact packs removed cool after just charge/flight cycle recommend increasing airflow around motor battery pack larger alr intake scoops exits Amptique flies long flights theres no reason cooling alr flowing during time pack shouldnt cool enough charge land ing Nextand personal matterI hate building fuselage landing gear built early stage construction sticks picks pokes everything else bench during completion model Lots model designs thisespecially OTs Any way landing gear assemblies go plane next last prop last So modi fied LG attachment scheme Amptique could just Check out accom panying photo another matter some have commented Amptique excellent plane firsttime fliers same student pilots would have easier time landing landing gear bit longer because plenty ground clearance big prop experi enced pilots beginners often need little little adjustment regard could save output gear shaft See related discussion Major Decal pass flying colors DISTRIBUTORS INQUIRIES INVITED Call Paul Major 413 525-4110 *7 Giant Scale Sheets *60 Size t38 Sheets *40 Size t38 Sheets *Propeller Decals InWT te Sheets -3 sizes es *Kill Markings.. t12 Sheets *Nomenclature Markings t3 Sizee-12 Sheetsin Black White copy *Letters Numbers ti i 3 4 4-13/16 10 Colors *Stare 10 Colors til Sizes plus Sheet ot Assorted Sizes major decals Custom decals Manufacturer 11 NORTHEAST SCREEN GRAPHICS 21 FISHER AVE. EAST LONOMEADOW MA 01028 TtL 4135254110 148 Model Aviation WHEEL BEARINGS Ideal Ducted Fans e Shortens Takeoff Run Eliminates Axle Friction e Renews Old Worn Wheel Hub Stabilizes Wheel Wheel Pantt e Eliminates Wheel Wobble e Steadies Nose Wheel Steering THESE BRONZE-OIL WHEEL BEARINGS ARE AVAILABLE IN THREE SIZES PACKAGED FOR TWO WHEELS 5132 DIA $200 3116 DIA $250 114 DIA $325 Please add 90C postage & handling J PRODUCTS 8470 HERITAGE DR CLARKSTON MICH 48016 313 625-5484 SEE YOUR DEALER FIRST column March 1987 MA Finally increasing trend toward highly detailed kit instruction booklets aid first-time model builders yes some readers have never glued two pieces balsa togetherthey tell Amptique kit could made better some written instructions sketches photos fret notfor outstanding kit tally worthy consideration beginning builder can always check some local experienced modelers questions may have building lieve designed-for-Electric plane will come extremely popular Which gives idea Maybe can talk KRC adding Amptique event next year s Electric Fly Well see Wire connectors above-referenced Keith Shawa Research Physicist Univer sity Michiganran some comparative tests several popular connectors various kinds wire particular wanted compare connec tor contact resistance wire resistance Keith measured voltage drops losses connectors under heavy current conditions associated operation models used test current level 20 amps measured voltages appearing across connector elements determined contact resistance version Ohms law thus Resistance age divided Current R connectors tested contact resistan ces CONTACT RESISTANCE milliohms Sermos Adams Jomar Deans 4-pin Tamiya Molex Astro gold 027005 035005 045005 09001 1401 4005 Using similar technique Keith compared resistance variety wire brands thus BRAND Jomar Belden Astro Jomar Lamp Cord GAUGE RESISTANCE milliohms/ft 1218 14277 13284 16444 16594 What does mean Its easy Connector contact resistance wire resistance causes volt age loss motor current flows means some battery voltage never gets motorwhich after its supposed go some losses Electric system cant anything aboutlike losses Ni-Cd cells fuses necessary make work does pay reduce can control much possible Read relevant real-life experience Just show can really add up something significant just helped friend fellow club member troubleshoot very unimpressive co balt geared 05-powered Viking seven 12 Ah cells SC4 speed control particularly heavy should ordinarily fly great hardly flew made some quick measurements field total volt age loss nearly two volts between battery terminals motor terminals checking further clear instal lation unusually large amount wire cause rather long separations motor battery switch speed control etc Furthermore wire used varied gauges consisted pieces varied connectors join ing together Guaranteed trouble offered take plane home tidy up installation done measured less 500 millivolts drop battery motor including speed control wiring fuse switch motor loaded draw 20 amps result plane flies just greatlike should see power loss approximately pro portional SQUARE voltage lossso little loss can go long way toward making Electric unimpressive Moral Pay attention wiring installation detailsit can make difference between No Go Go Sermos Snap Connectors Its littleknown fact Sermos Snap Connectors available colors other familiar red black color options available di rect hobby shops fact have some blue green orange yellow-and-white ones variety useful installation connector pair want sure connect wrong things together easy everything either red black Price same$3 per connector pair Now assembly tip finished solder ing wire metal contacts Snap Connectors wipe silver-plated contacts off well solvent such acetone done remove solder flux may likely have coated mating area result little lots contact resistance no contact small brush cotton swab tissue soaked sol vent will good job Dry part another tissue prior installation plastic housing Th-Th-Th-Thats folks end another column have yet include promised final report motor/ prop/battery testing Caliph Sorryit will have wait will say writing have accumulated 231 flights labors ful fill promise Also Ive made another wingwith aileronsbut like Caliph original wing better Anyway just too other items cover herethis being annual issue after Nats issue Ive two months accumulate column material fertile time year happen summer Now close column go back very beginning read what says Write medirectly Please send comment question SASE please Bob Kopski 25 West End Dr Iansdale PA 19446 RC Giant Scale/de Vries Continued page 51 mouthwatering extreme going hold list close chestor Bill would spend time answering letters rather drafting great construction drawings Although subject column Giant Continued page 152 OPS Mmxi 30 designed strictly model use incorporates extra long stroke turn large props heavy scale planes five intake ports Gilnisil plating give better breathing higher RPM along longer cylinder life both statically dynamically balanced comes roller bearings both ends steel rod DellOrto pump carb operates mixture methanol 50b oil proud engine would like learn its qualities Send free engine test December 1987 149 BRAND gsPjPIe 9m*t4 PO Box 26247NEW ORLEANS LA 70186 1-800-535-2568
Edition: Model Aviation - 1987/12
Page Numbers: 48, 49, 148, 149
Radio Control E lectrics Bob Kopski Please send comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 REGULAR READERS will recognize above opening regular closing Nothis zero-length column just seems some read ers never get end column because incoming mail comes directly some comes via Model Aviation editorial office good folks MA forward mail sent can get faster ans wers using home address above Besides itll save folks AMA HQ some work Nuff said Charger modification follow-up snafu occurred article Sep tember issue As can imagine number folks have contacted about Mods DC/DC Super Charger article appeared September 1987 issue MAcomplete major built-in error errormislabeling two places Figure 4 page 83was corrected two places October 1987 issue namely Letters Editor column regular column Some folks contacted before Octo ber issue came out got corrected info sooner Some wrote called say modified charger worked just fine corrections made Im happy say far no has openly angry trouble Fred Ewings Amptique Front end shot above shows added air scoop increases cool ing air flow battery Dont forget increase size air exit tool Planes interior Below reveals Leisure LT5O geared motor heat sink Jomar SC5 speed control charge jack arming switch connectors Speed control PC board attached fuselage side sticky-backed Velcro strips Fred extended fuselage structure cover gear box 48 Model Aviation Amptique built KRC club use prize recent Electric 1-lY OD says kit excellent Parts fit perfectly Wing struc ture includes shear webs false ribs diagonal braces light weight rigidity Modified landing gear mount L uses kit former wire held #2 sheet metal screws nylon clamps Install gear after model complete Leave slot bottom sheeting ac cess screws through motor-mount hole through access hatch Fuselage construction easier gear way Some connectors discussed text Top-to-Bottom Sermos Snap Tamiya large Molex small gold-pin Molex 5C5 speed-control dIsconnect experiencedalthough couldnt blame error caused MUCH personal grief am very grateful pa tience understanding Thank very much new nickel-cadmium cell way has just announced Sanyo Its called Extra cell label includes letters SCE new product series offers 40% performance should readily avail able late spring 1988 Specifically SCE designated cells will offer 40% ca pacity ampere-hours previous cells same cell physical size importantly extra capacity comes almost no increase weight As specific example popular 1200 SC 12 Ah weighs 177 ox new Sanyo Extra same physical dimensions will labeled 1700 SCE 17 Ah weigh 187 oz latter cell has 55 milliohnis internal resis tance compared 42 niilliohms famil iar SC means newer will have relatively higher internal losses heating losses small compared increased capacity Sanyo will offer new cells familiar sizes whether youre flying 1200s 900s 800s youll able directly substitute new ones cost About 35% youre used payingnot bad cause 40% ca pacity 35% coins get moneys worth expect try out some samples near fu ture Ill able pass along some firsthand info few months Meanwhile Ill just con tinue happily flying eight Electricsall 100% Sanyo-powered83 cells total air counting spare packsof sizes Graupner Electric products readily avail able Hobby Lobby extensive cata log listing other modeling products best part catalog free can check Advertisers Index back magazine get back Electric stuff local flier has just completed Silentius Electric Sailplane powered recom mended Graupner gear drive power system system uses extension shaft between motor Continued page 148 Best Europe s leading manufacturer Pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include Helmets les Sun Glasses Bobble Hats Baseball Caps Floppy Hats Bone Domes Oxygen Masks Maewests popular types WW WW II sports one-piece suit stripes j lall colorsl NATO one-piece suit map pockets lolive greenl glider pilots turtle neck sweaters floppy hat sun glasses Standard pilot tan pants simulated leather jacket fur collar baseball cap sun glasses pilots lightest ever come painted dressed ready fly 1/4 Scale 0 Plus $500 postag handling 1/ Scale 0 airmail Have fun 1A Scale parachutist ram chute rip-stop nylon ready servos Takes standard flight pack makes $9000 Plus $10 Postage Handling Easy Ordering t delivery send phone VISA MasterCard Number AH DESIGNS 81 OLD WORKSHOPS FFORDDDERWEN CL WYD UK 2YR New Fourmost Products Cooney Gapless Hinge 45 0 New Improved Cooney Gapless Hinge added strength new white color easy stall hinge Gapless Hinge extrud ed strip polyurethane completely fuelproof forms perfectly gapless con trol surface seal greatly creases areodynamic efficiency Available two sizes Small 1/8 1/4 Large 1/4 larger Price $350 per 3 ft length information about Cooney Gapless Hinges other innovative model products Fourmost send stamped self-addressed business size envelope FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97116 503 357-2732 December 1987 49 1/ Scale Scale CHALLENGE ENGINEERING POBax 67 New Baden Texas 77870 409 828-3105 NOW AVAILABLE AGAIN IN THE UNITED *CLARK AIRSCREW Need rs Choice Standard Propssolid Hard Birch FROM 12 inch THROUGH 28 inch DIAMETER WW-l Sopwith Camel Pro ps. FROM 17 inch THROUGH 20 inch DIAMETER Birch Laminated Maple/Cherry DEALER INQUIRIES INVITED STATES OF AMERICA PRO4LER THE CIAAIDBCREW CCZiCZiZ Model Aircraft Supply 2521 Bluff Road Traverse City Michigan 49684 Send SASE Price Ilatllnformation 1-616-947-8562 Z RC Electrics/Kopski Continued page 49 prop drive motor may mounted closer center-of-gravity plane frontal fuselage area can re duced just needed prop bearing hub saw maiden flightand several since thenand plane flew very impressively such relatively economical package subject Hobby Lobbys Graup ncr systems supplies Jim Martinhead mod eler HLtells Graupner 1200 mAh packs have recently re-rated 1400 mAh capacity no price increase Items other Graupner brand include stretched-wing Electric version Prontoone all-time favor ite Gas models Yes used play goo too Anyway theres lots things catalog rest up Mitch Polings book Build Fly Elec tric Powered Model Aircraft has mentioned several times regular column Mitch Electric columnist Model Builder magazine Ive mentioned book pub lished Kalmbach failed include neces sary mail order information Ive paid pricelots individual letters asking So get Mitchs bookwhich recommend write Kaimbach Books 1027 North Seventh Street Milwaukee WI 53233 cost $995 plus $1 postage handling Leisure Amptiquemore well-known Keith Shaw Ann Arbor MI told pleased Leisure Amptique passed along some conversation Sep tember 1987 issue MA Since time Ive opportunity fly Amptiques other folks also build fly self WellKeith perfectly right always isthe Amptique great flier uncondition ally wholeheartedly recommend either plane just try Electric stuff out first-time RC flight trainer model Amptique very graceful forgiving fliera delight air effect its sort low-aspect Electric powered glider wheels easily ROGs low- moderate-priced power systems flew equipped Leisure LT-50 251 geared motor seven 800 mAh cells 10 x 6 prop Another used Ky osho 360 PT gear drive unit Kyosho 9 x 8 Etude prop 800 mAh cells Both installations equipped Jomar SC-S speed controls necessities added greatly flying enjoyment back built kit best kit Ive ever built Everything fit per fectly wood excellentI substituted piece cause broke Others Ive spoken have built Amptique equally vocal praising kit quality would build fly Cause its part prize given away upcoming KRC Electric Fly Its now scheduled August 31long since past time read fortunate enough get kit Leisure stock gear drive system donation some club members joined forces make Amptique ARF available some very lucky person may now reading Anyway built framework John Hickey cov ered Fred Ewing has Amptique flying building second did installa tion can hardly wait see winners reac tion Now back plane itself accumu lated local experience few possible re finements personalizations may interest First some may find wing dowels just tad shortso substituting somewhat longer ones will help hold wing rubbers easily Second noticed very high heat summer made impossible keep batter ies cool stock cooling system fact packs removed cool after just charge/flight cycle recommend increasing airflow around motor battery pack larger alr intake scoops exits Amptique flies long flights theres no reason cooling alr flowing during time pack shouldnt cool enough charge land ing Nextand personal matterI hate building fuselage landing gear built early stage construction sticks picks pokes everything else bench during completion model Lots model designs thisespecially OTs Any way landing gear assemblies go plane next last prop last So modi fied LG attachment scheme Amptique could just Check out accom panying photo another matter some have commented Amptique excellent plane firsttime fliers same student pilots would have easier time landing landing gear bit longer because plenty ground clearance big prop experi enced pilots beginners often need little little adjustment regard could save output gear shaft See related discussion Major Decal pass flying colors DISTRIBUTORS INQUIRIES INVITED Call Paul Major 413 525-4110 *7 Giant Scale Sheets *60 Size t38 Sheets *40 Size t38 Sheets *Propeller Decals InWT te Sheets -3 sizes es *Kill Markings.. t12 Sheets *Nomenclature Markings t3 Sizee-12 Sheetsin Black White copy *Letters Numbers ti i 3 4 4-13/16 10 Colors *Stare 10 Colors til Sizes plus Sheet ot Assorted Sizes major decals Custom decals Manufacturer 11 NORTHEAST SCREEN GRAPHICS 21 FISHER AVE. EAST LONOMEADOW MA 01028 TtL 4135254110 148 Model Aviation WHEEL BEARINGS Ideal Ducted Fans e Shortens Takeoff Run Eliminates Axle Friction e Renews Old Worn Wheel Hub Stabilizes Wheel Wheel Pantt e Eliminates Wheel Wobble e Steadies Nose Wheel Steering THESE BRONZE-OIL WHEEL BEARINGS ARE AVAILABLE IN THREE SIZES PACKAGED FOR TWO WHEELS 5132 DIA $200 3116 DIA $250 114 DIA $325 Please add 90C postage & handling J PRODUCTS 8470 HERITAGE DR CLARKSTON MICH 48016 313 625-5484 SEE YOUR DEALER FIRST column March 1987 MA Finally increasing trend toward highly detailed kit instruction booklets aid first-time model builders yes some readers have never glued two pieces balsa togetherthey tell Amptique kit could made better some written instructions sketches photos fret notfor outstanding kit tally worthy consideration beginning builder can always check some local experienced modelers questions may have building lieve designed-for-Electric plane will come extremely popular Which gives idea Maybe can talk KRC adding Amptique event next year s Electric Fly Well see Wire connectors above-referenced Keith Shawa Research Physicist Univer sity Michiganran some comparative tests several popular connectors various kinds wire particular wanted compare connec tor contact resistance wire resistance Keith measured voltage drops losses connectors under heavy current conditions associated operation models used test current level 20 amps measured voltages appearing across connector elements determined contact resistance version Ohms law thus Resistance age divided Current R connectors tested contact resistan ces CONTACT RESISTANCE milliohms Sermos Adams Jomar Deans 4-pin Tamiya Molex Astro gold 027005 035005 045005 09001 1401 4005 Using similar technique Keith compared resistance variety wire brands thus BRAND Jomar Belden Astro Jomar Lamp Cord GAUGE RESISTANCE milliohms/ft 1218 14277 13284 16444 16594 What does mean Its easy Connector contact resistance wire resistance causes volt age loss motor current flows means some battery voltage never gets motorwhich after its supposed go some losses Electric system cant anything aboutlike losses Ni-Cd cells fuses necessary make work does pay reduce can control much possible Read relevant real-life experience Just show can really add up something significant just helped friend fellow club member troubleshoot very unimpressive co balt geared 05-powered Viking seven 12 Ah cells SC4 speed control particularly heavy should ordinarily fly great hardly flew made some quick measurements field total volt age loss nearly two volts between battery terminals motor terminals checking further clear instal lation unusually large amount wire cause rather long separations motor battery switch speed control etc Furthermore wire used varied gauges consisted pieces varied connectors join ing together Guaranteed trouble offered take plane home tidy up installation done measured less 500 millivolts drop battery motor including speed control wiring fuse switch motor loaded draw 20 amps result plane flies just greatlike should see power loss approximately pro portional SQUARE voltage lossso little loss can go long way toward making Electric unimpressive Moral Pay attention wiring installation detailsit can make difference between No Go Go Sermos Snap Connectors Its littleknown fact Sermos Snap Connectors available colors other familiar red black color options available di rect hobby shops fact have some blue green orange yellow-and-white ones variety useful installation connector pair want sure connect wrong things together easy everything either red black Price same$3 per connector pair Now assembly tip finished solder ing wire metal contacts Snap Connectors wipe silver-plated contacts off well solvent such acetone done remove solder flux may likely have coated mating area result little lots contact resistance no contact small brush cotton swab tissue soaked sol vent will good job Dry part another tissue prior installation plastic housing Th-Th-Th-Thats folks end another column have yet include promised final report motor/ prop/battery testing Caliph Sorryit will have wait will say writing have accumulated 231 flights labors ful fill promise Also Ive made another wingwith aileronsbut like Caliph original wing better Anyway just too other items cover herethis being annual issue after Nats issue Ive two months accumulate column material fertile time year happen summer Now close column go back very beginning read what says Write medirectly Please send comment question SASE please Bob Kopski 25 West End Dr Iansdale PA 19446 RC Giant Scale/de Vries Continued page 51 mouthwatering extreme going hold list close chestor Bill would spend time answering letters rather drafting great construction drawings Although subject column Giant Continued page 152 OPS Mmxi 30 designed strictly model use incorporates extra long stroke turn large props heavy scale planes five intake ports Gilnisil plating give better breathing higher RPM along longer cylinder life both statically dynamically balanced comes roller bearings both ends steel rod DellOrto pump carb operates mixture methanol 50b oil proud engine would like learn its qualities Send free engine test December 1987 149 BRAND gsPjPIe 9m*t4 PO Box 26247NEW ORLEANS LA 70186 1-800-535-2568
Edition: Model Aviation - 1987/12
Page Numbers: 48, 49, 148, 149
Radio Control E lectrics Bob Kopski Please send comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 REGULAR READERS will recognize above opening regular closing Nothis zero-length column just seems some read ers never get end column because incoming mail comes directly some comes via Model Aviation editorial office good folks MA forward mail sent can get faster ans wers using home address above Besides itll save folks AMA HQ some work Nuff said Charger modification follow-up snafu occurred article Sep tember issue As can imagine number folks have contacted about Mods DC/DC Super Charger article appeared September 1987 issue MAcomplete major built-in error errormislabeling two places Figure 4 page 83was corrected two places October 1987 issue namely Letters Editor column regular column Some folks contacted before Octo ber issue came out got corrected info sooner Some wrote called say modified charger worked just fine corrections made Im happy say far no has openly angry trouble Fred Ewings Amptique Front end shot above shows added air scoop increases cool ing air flow battery Dont forget increase size air exit tool Planes interior Below reveals Leisure LT5O geared motor heat sink Jomar SC5 speed control charge jack arming switch connectors Speed control PC board attached fuselage side sticky-backed Velcro strips Fred extended fuselage structure cover gear box 48 Model Aviation Amptique built KRC club use prize recent Electric 1-lY OD says kit excellent Parts fit perfectly Wing struc ture includes shear webs false ribs diagonal braces light weight rigidity Modified landing gear mount L uses kit former wire held #2 sheet metal screws nylon clamps Install gear after model complete Leave slot bottom sheeting ac cess screws through motor-mount hole through access hatch Fuselage construction easier gear way Some connectors discussed text Top-to-Bottom Sermos Snap Tamiya large Molex small gold-pin Molex 5C5 speed-control dIsconnect experiencedalthough couldnt blame error caused MUCH personal grief am very grateful pa tience understanding Thank very much new nickel-cadmium cell way has just announced Sanyo Its called Extra cell label includes letters SCE new product series offers 40% performance should readily avail able late spring 1988 Specifically SCE designated cells will offer 40% ca pacity ampere-hours previous cells same cell physical size importantly extra capacity comes almost no increase weight As specific example popular 1200 SC 12 Ah weighs 177 ox new Sanyo Extra same physical dimensions will labeled 1700 SCE 17 Ah weigh 187 oz latter cell has 55 milliohnis internal resis tance compared 42 niilliohms famil iar SC means newer will have relatively higher internal losses heating losses small compared increased capacity Sanyo will offer new cells familiar sizes whether youre flying 1200s 900s 800s youll able directly substitute new ones cost About 35% youre used payingnot bad cause 40% ca pacity 35% coins get moneys worth expect try out some samples near fu ture Ill able pass along some firsthand info few months Meanwhile Ill just con tinue happily flying eight Electricsall 100% Sanyo-powered83 cells total air counting spare packsof sizes Graupner Electric products readily avail able Hobby Lobby extensive cata log listing other modeling products best part catalog free can check Advertisers Index back magazine get back Electric stuff local flier has just completed Silentius Electric Sailplane powered recom mended Graupner gear drive power system system uses extension shaft between motor Continued page 148 Best Europe s leading manufacturer Pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include Helmets les Sun Glasses Bobble Hats Baseball Caps Floppy Hats Bone Domes Oxygen Masks Maewests popular types WW WW II sports one-piece suit stripes j lall colorsl NATO one-piece suit map pockets lolive greenl glider pilots turtle neck sweaters floppy hat sun glasses Standard pilot tan pants simulated leather jacket fur collar baseball cap sun glasses pilots lightest ever come painted dressed ready fly 1/4 Scale 0 Plus $500 postag handling 1/ Scale 0 airmail Have fun 1A Scale parachutist ram chute rip-stop nylon ready servos Takes standard flight pack makes $9000 Plus $10 Postage Handling Easy Ordering t delivery send phone VISA MasterCard Number AH DESIGNS 81 OLD WORKSHOPS FFORDDDERWEN CL WYD UK 2YR New Fourmost Products Cooney Gapless Hinge 45 0 New Improved Cooney Gapless Hinge added strength new white color easy stall hinge Gapless Hinge extrud ed strip polyurethane completely fuelproof forms perfectly gapless con trol surface seal greatly creases areodynamic efficiency Available two sizes Small 1/8 1/4 Large 1/4 larger Price $350 per 3 ft length information about Cooney Gapless Hinges other innovative model products Fourmost send stamped self-addressed business size envelope FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97116 503 357-2732 December 1987 49 1/ Scale Scale CHALLENGE ENGINEERING POBax 67 New Baden Texas 77870 409 828-3105 NOW AVAILABLE AGAIN IN THE UNITED *CLARK AIRSCREW Need rs Choice Standard Propssolid Hard Birch FROM 12 inch THROUGH 28 inch DIAMETER WW-l Sopwith Camel Pro ps. FROM 17 inch THROUGH 20 inch DIAMETER Birch Laminated Maple/Cherry DEALER INQUIRIES INVITED STATES OF AMERICA PRO4LER THE CIAAIDBCREW CCZiCZiZ Model Aircraft Supply 2521 Bluff Road Traverse City Michigan 49684 Send SASE Price Ilatllnformation 1-616-947-8562 Z RC Electrics/Kopski Continued page 49 prop drive motor may mounted closer center-of-gravity plane frontal fuselage area can re duced just needed prop bearing hub saw maiden flightand several since thenand plane flew very impressively such relatively economical package subject Hobby Lobbys Graup ncr systems supplies Jim Martinhead mod eler HLtells Graupner 1200 mAh packs have recently re-rated 1400 mAh capacity no price increase Items other Graupner brand include stretched-wing Electric version Prontoone all-time favor ite Gas models Yes used play goo too Anyway theres lots things catalog rest up Mitch Polings book Build Fly Elec tric Powered Model Aircraft has mentioned several times regular column Mitch Electric columnist Model Builder magazine Ive mentioned book pub lished Kalmbach failed include neces sary mail order information Ive paid pricelots individual letters asking So get Mitchs bookwhich recommend write Kaimbach Books 1027 North Seventh Street Milwaukee WI 53233 cost $995 plus $1 postage handling Leisure Amptiquemore well-known Keith Shaw Ann Arbor MI told pleased Leisure Amptique passed along some conversation Sep tember 1987 issue MA Since time Ive opportunity fly Amptiques other folks also build fly self WellKeith perfectly right always isthe Amptique great flier uncondition ally wholeheartedly recommend either plane just try Electric stuff out first-time RC flight trainer model Amptique very graceful forgiving fliera delight air effect its sort low-aspect Electric powered glider wheels easily ROGs low- moderate-priced power systems flew equipped Leisure LT-50 251 geared motor seven 800 mAh cells 10 x 6 prop Another used Ky osho 360 PT gear drive unit Kyosho 9 x 8 Etude prop 800 mAh cells Both installations equipped Jomar SC-S speed controls necessities added greatly flying enjoyment back built kit best kit Ive ever built Everything fit per fectly wood excellentI substituted piece cause broke Others Ive spoken have built Amptique equally vocal praising kit quality would build fly Cause its part prize given away upcoming KRC Electric Fly Its now scheduled August 31long since past time read fortunate enough get kit Leisure stock gear drive system donation some club members joined forces make Amptique ARF available some very lucky person may now reading Anyway built framework John Hickey cov ered Fred Ewing has Amptique flying building second did installa tion can hardly wait see winners reac tion Now back plane itself accumu lated local experience few possible re finements personalizations may interest First some may find wing dowels just tad shortso substituting somewhat longer ones will help hold wing rubbers easily Second noticed very high heat summer made impossible keep batter ies cool stock cooling system fact packs removed cool after just charge/flight cycle recommend increasing airflow around motor battery pack larger alr intake scoops exits Amptique flies long flights theres no reason cooling alr flowing during time pack shouldnt cool enough charge land ing Nextand personal matterI hate building fuselage landing gear built early stage construction sticks picks pokes everything else bench during completion model Lots model designs thisespecially OTs Any way landing gear assemblies go plane next last prop last So modi fied LG attachment scheme Amptique could just Check out accom panying photo another matter some have commented Amptique excellent plane firsttime fliers same student pilots would have easier time landing landing gear bit longer because plenty ground clearance big prop experi enced pilots beginners often need little little adjustment regard could save output gear shaft See related discussion Major Decal pass flying colors DISTRIBUTORS INQUIRIES INVITED Call Paul Major 413 525-4110 *7 Giant Scale Sheets *60 Size t38 Sheets *40 Size t38 Sheets *Propeller Decals InWT te Sheets -3 sizes es *Kill Markings.. t12 Sheets *Nomenclature Markings t3 Sizee-12 Sheetsin Black White copy *Letters Numbers ti i 3 4 4-13/16 10 Colors *Stare 10 Colors til Sizes plus Sheet ot Assorted Sizes major decals Custom decals Manufacturer 11 NORTHEAST SCREEN GRAPHICS 21 FISHER AVE. EAST LONOMEADOW MA 01028 TtL 4135254110 148 Model Aviation WHEEL BEARINGS Ideal Ducted Fans e Shortens Takeoff Run Eliminates Axle Friction e Renews Old Worn Wheel Hub Stabilizes Wheel Wheel Pantt e Eliminates Wheel Wobble e Steadies Nose Wheel Steering THESE BRONZE-OIL WHEEL BEARINGS ARE AVAILABLE IN THREE SIZES PACKAGED FOR TWO WHEELS 5132 DIA $200 3116 DIA $250 114 DIA $325 Please add 90C postage & handling J PRODUCTS 8470 HERITAGE DR CLARKSTON MICH 48016 313 625-5484 SEE YOUR DEALER FIRST column March 1987 MA Finally increasing trend toward highly detailed kit instruction booklets aid first-time model builders yes some readers have never glued two pieces balsa togetherthey tell Amptique kit could made better some written instructions sketches photos fret notfor outstanding kit tally worthy consideration beginning builder can always check some local experienced modelers questions may have building lieve designed-for-Electric plane will come extremely popular Which gives idea Maybe can talk KRC adding Amptique event next year s Electric Fly Well see Wire connectors above-referenced Keith Shawa Research Physicist Univer sity Michiganran some comparative tests several popular connectors various kinds wire particular wanted compare connec tor contact resistance wire resistance Keith measured voltage drops losses connectors under heavy current conditions associated operation models used test current level 20 amps measured voltages appearing across connector elements determined contact resistance version Ohms law thus Resistance age divided Current R connectors tested contact resistan ces CONTACT RESISTANCE milliohms Sermos Adams Jomar Deans 4-pin Tamiya Molex Astro gold 027005 035005 045005 09001 1401 4005 Using similar technique Keith compared resistance variety wire brands thus BRAND Jomar Belden Astro Jomar Lamp Cord GAUGE RESISTANCE milliohms/ft 1218 14277 13284 16444 16594 What does mean Its easy Connector contact resistance wire resistance causes volt age loss motor current flows means some battery voltage never gets motorwhich after its supposed go some losses Electric system cant anything aboutlike losses Ni-Cd cells fuses necessary make work does pay reduce can control much possible Read relevant real-life experience Just show can really add up something significant just helped friend fellow club member troubleshoot very unimpressive co balt geared 05-powered Viking seven 12 Ah cells SC4 speed control particularly heavy should ordinarily fly great hardly flew made some quick measurements field total volt age loss nearly two volts between battery terminals motor terminals checking further clear instal lation unusually large amount wire cause rather long separations motor battery switch speed control etc Furthermore wire used varied gauges consisted pieces varied connectors join ing together Guaranteed trouble offered take plane home tidy up installation done measured less 500 millivolts drop battery motor including speed control wiring fuse switch motor loaded draw 20 amps result plane flies just greatlike should see power loss approximately pro portional SQUARE voltage lossso little loss can go long way toward making Electric unimpressive Moral Pay attention wiring installation detailsit can make difference between No Go Go Sermos Snap Connectors Its littleknown fact Sermos Snap Connectors available colors other familiar red black color options available di rect hobby shops fact have some blue green orange yellow-and-white ones variety useful installation connector pair want sure connect wrong things together easy everything either red black Price same$3 per connector pair Now assembly tip finished solder ing wire metal contacts Snap Connectors wipe silver-plated contacts off well solvent such acetone done remove solder flux may likely have coated mating area result little lots contact resistance no contact small brush cotton swab tissue soaked sol vent will good job Dry part another tissue prior installation plastic housing Th-Th-Th-Thats folks end another column have yet include promised final report motor/ prop/battery testing Caliph Sorryit will have wait will say writing have accumulated 231 flights labors ful fill promise Also Ive made another wingwith aileronsbut like Caliph original wing better Anyway just too other items cover herethis being annual issue after Nats issue Ive two months accumulate column material fertile time year happen summer Now close column go back very beginning read what says Write medirectly Please send comment question SASE please Bob Kopski 25 West End Dr Iansdale PA 19446 RC Giant Scale/de Vries Continued page 51 mouthwatering extreme going hold list close chestor Bill would spend time answering letters rather drafting great construction drawings Although subject column Giant Continued page 152 OPS Mmxi 30 designed strictly model use incorporates extra long stroke turn large props heavy scale planes five intake ports Gilnisil plating give better breathing higher RPM along longer cylinder life both statically dynamically balanced comes roller bearings both ends steel rod DellOrto pump carb operates mixture methanol 50b oil proud engine would like learn its qualities Send free engine test December 1987 149 BRAND gsPjPIe 9m*t4 PO Box 26247NEW ORLEANS LA 70186 1-800-535-2568
Edition: Model Aviation - 1987/12
Page Numbers: 48, 49, 148, 149
Radio Control E lectrics Bob Kopski Please send comment question SASE please Bob Kopski 25 West End Dr Lansdale PA 19446 REGULAR READERS will recognize above opening regular closing Nothis zero-length column just seems some read ers never get end column because incoming mail comes directly some comes via Model Aviation editorial office good folks MA forward mail sent can get faster ans wers using home address above Besides itll save folks AMA HQ some work Nuff said Charger modification follow-up snafu occurred article Sep tember issue As can imagine number folks have contacted about Mods DC/DC Super Charger article appeared September 1987 issue MAcomplete major built-in error errormislabeling two places Figure 4 page 83was corrected two places October 1987 issue namely Letters Editor column regular column Some folks contacted before Octo ber issue came out got corrected info sooner Some wrote called say modified charger worked just fine corrections made Im happy say far no has openly angry trouble Fred Ewings Amptique Front end shot above shows added air scoop increases cool ing air flow battery Dont forget increase size air exit tool Planes interior Below reveals Leisure LT5O geared motor heat sink Jomar SC5 speed control charge jack arming switch connectors Speed control PC board attached fuselage side sticky-backed Velcro strips Fred extended fuselage structure cover gear box 48 Model Aviation Amptique built KRC club use prize recent Electric 1-lY OD says kit excellent Parts fit perfectly Wing struc ture includes shear webs false ribs diagonal braces light weight rigidity Modified landing gear mount L uses kit former wire held #2 sheet metal screws nylon clamps Install gear after model complete Leave slot bottom sheeting ac cess screws through motor-mount hole through access hatch Fuselage construction easier gear way Some connectors discussed text Top-to-Bottom Sermos Snap Tamiya large Molex small gold-pin Molex 5C5 speed-control dIsconnect experiencedalthough couldnt blame error caused MUCH personal grief am very grateful pa tience understanding Thank very much new nickel-cadmium cell way has just announced Sanyo Its called Extra cell label includes letters SCE new product series offers 40% performance should readily avail able late spring 1988 Specifically SCE designated cells will offer 40% ca pacity ampere-hours previous cells same cell physical size importantly extra capacity comes almost no increase weight As specific example popular 1200 SC 12 Ah weighs 177 ox new Sanyo Extra same physical dimensions will labeled 1700 SCE 17 Ah weigh 187 oz latter cell has 55 milliohnis internal resis tance compared 42 niilliohms famil iar SC means newer will have relatively higher internal losses heating losses small compared increased capacity Sanyo will offer new cells familiar sizes whether youre flying 1200s 900s 800s youll able directly substitute new ones cost About 35% youre used payingnot bad cause 40% ca pacity 35% coins get moneys worth expect try out some samples near fu ture Ill able pass along some firsthand info few months Meanwhile Ill just con tinue happily flying eight Electricsall 100% Sanyo-powered83 cells total air counting spare packsof sizes Graupner Electric products readily avail able Hobby Lobby extensive cata log listing other modeling products best part catalog free can check Advertisers Index back magazine get back Electric stuff local flier has just completed Silentius Electric Sailplane powered recom mended Graupner gear drive power system system uses extension shaft between motor Continued page 148 Best Europe s leading manufacturer Pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include Helmets les Sun Glasses Bobble Hats Baseball Caps Floppy Hats Bone Domes Oxygen Masks Maewests popular types WW WW II sports one-piece suit stripes j lall colorsl NATO one-piece suit map pockets lolive greenl glider pilots turtle neck sweaters floppy hat sun glasses Standard pilot tan pants simulated leather jacket fur collar baseball cap sun glasses pilots lightest ever come painted dressed ready fly 1/4 Scale 0 Plus $500 postag handling 1/ Scale 0 airmail Have fun 1A Scale parachutist ram chute rip-stop nylon ready servos Takes standard flight pack makes $9000 Plus $10 Postage Handling Easy Ordering t delivery send phone VISA MasterCard Number AH DESIGNS 81 OLD WORKSHOPS FFORDDDERWEN CL WYD UK 2YR New Fourmost Products Cooney Gapless Hinge 45 0 New Improved Cooney Gapless Hinge added strength new white color easy stall hinge Gapless Hinge extrud ed strip polyurethane completely fuelproof forms perfectly gapless con trol surface seal greatly creases areodynamic efficiency Available two sizes Small 1/8 1/4 Large 1/4 larger Price $350 per 3 ft length information about Cooney Gapless Hinges other innovative model products Fourmost send stamped self-addressed business size envelope FOURMOST PRODUCTS 4040 24th Avenue Forest Grove OR 97116 503 357-2732 December 1987 49 1/ Scale Scale CHALLENGE ENGINEERING POBax 67 New Baden Texas 77870 409 828-3105 NOW AVAILABLE AGAIN IN THE UNITED *CLARK AIRSCREW Need rs Choice Standard Propssolid Hard Birch FROM 12 inch THROUGH 28 inch DIAMETER WW-l Sopwith Camel Pro ps. FROM 17 inch THROUGH 20 inch DIAMETER Birch Laminated Maple/Cherry DEALER INQUIRIES INVITED STATES OF AMERICA PRO4LER THE CIAAIDBCREW CCZiCZiZ Model Aircraft Supply 2521 Bluff Road Traverse City Michigan 49684 Send SASE Price Ilatllnformation 1-616-947-8562 Z RC Electrics/Kopski Continued page 49 prop drive motor may mounted closer center-of-gravity plane frontal fuselage area can re duced just needed prop bearing hub saw maiden flightand several since thenand plane flew very impressively such relatively economical package subject Hobby Lobbys Graup ncr systems supplies Jim Martinhead mod eler HLtells Graupner 1200 mAh packs have recently re-rated 1400 mAh capacity no price increase Items other Graupner brand include stretched-wing Electric version Prontoone all-time favor ite Gas models Yes used play goo too Anyway theres lots things catalog rest up Mitch Polings book Build Fly Elec tric Powered Model Aircraft has mentioned several times regular column Mitch Electric columnist Model Builder magazine Ive mentioned book pub lished Kalmbach failed include neces sary mail order information Ive paid pricelots individual letters asking So get Mitchs bookwhich recommend write Kaimbach Books 1027 North Seventh Street Milwaukee WI 53233 cost $995 plus $1 postage handling Leisure Amptiquemore well-known Keith Shaw Ann Arbor MI told pleased Leisure Amptique passed along some conversation Sep tember 1987 issue MA Since time Ive opportunity fly Amptiques other folks also build fly self WellKeith perfectly right always isthe Amptique great flier uncondition ally wholeheartedly recommend either plane just try Electric stuff out first-time RC flight trainer model Amptique very graceful forgiving fliera delight air effect its sort low-aspect Electric powered glider wheels easily ROGs low- moderate-priced power systems flew equipped Leisure LT-50 251 geared motor seven 800 mAh cells 10 x 6 prop Another used Ky osho 360 PT gear drive unit Kyosho 9 x 8 Etude prop 800 mAh cells Both installations equipped Jomar SC-S speed controls necessities added greatly flying enjoyment back built kit best kit Ive ever built Everything fit per fectly wood excellentI substituted piece cause broke Others Ive spoken have built Amptique equally vocal praising kit quality would build fly Cause its part prize given away upcoming KRC Electric Fly Its now scheduled August 31long since past time read fortunate enough get kit Leisure stock gear drive system donation some club members joined forces make Amptique ARF available some very lucky person may now reading Anyway built framework John Hickey cov ered Fred Ewing has Amptique flying building second did installa tion can hardly wait see winners reac tion Now back plane itself accumu lated local experience few possible re finements personalizations may interest First some may find wing dowels just tad shortso substituting somewhat longer ones will help hold wing rubbers easily Second noticed very high heat summer made impossible keep batter ies cool stock cooling system fact packs removed cool after just charge/flight cycle recommend increasing airflow around motor battery pack larger alr intake scoops exits Amptique flies long flights theres no reason cooling alr flowing during time pack shouldnt cool enough charge land ing Nextand personal matterI hate building fuselage landing gear built early stage construction sticks picks pokes everything else bench during completion model Lots model designs thisespecially OTs Any way landing gear assemblies go plane next last prop last So modi fied LG attachment scheme Amptique could just Check out accom panying photo another matter some have commented Amptique excellent plane firsttime fliers same student pilots would have easier time landing landing gear bit longer because plenty ground clearance big prop experi enced pilots beginners often need little little adjustment regard could save output gear shaft See related discussion Major Decal pass flying colors DISTRIBUTORS INQUIRIES INVITED Call Paul Major 413 525-4110 *7 Giant Scale Sheets *60 Size t38 Sheets *40 Size t38 Sheets *Propeller Decals InWT te Sheets -3 sizes es *Kill Markings.. t12 Sheets *Nomenclature Markings t3 Sizee-12 Sheetsin Black White copy *Letters Numbers ti i 3 4 4-13/16 10 Colors *Stare 10 Colors til Sizes plus Sheet ot Assorted Sizes major decals Custom decals Manufacturer 11 NORTHEAST SCREEN GRAPHICS 21 FISHER AVE. EAST LONOMEADOW MA 01028 TtL 4135254110 148 Model Aviation WHEEL BEARINGS Ideal Ducted Fans e Shortens Takeoff Run Eliminates Axle Friction e Renews Old Worn Wheel Hub Stabilizes Wheel Wheel Pantt e Eliminates Wheel Wobble e Steadies Nose Wheel Steering THESE BRONZE-OIL WHEEL BEARINGS ARE AVAILABLE IN THREE SIZES PACKAGED FOR TWO WHEELS 5132 DIA $200 3116 DIA $250 114 DIA $325 Please add 90C postage & handling J PRODUCTS 8470 HERITAGE DR CLARKSTON MICH 48016 313 625-5484 SEE YOUR DEALER FIRST column March 1987 MA Finally increasing trend toward highly detailed kit instruction booklets aid first-time model builders yes some readers have never glued two pieces balsa togetherthey tell Amptique kit could made better some written instructions sketches photos fret notfor outstanding kit tally worthy consideration beginning builder can always check some local experienced modelers questions may have building lieve designed-for-Electric plane will come extremely popular Which gives idea Maybe can talk KRC adding Amptique event next year s Electric Fly Well see Wire connectors above-referenced Keith Shawa Research Physicist Univer sity Michiganran some comparative tests several popular connectors various kinds wire particular wanted compare connec tor contact resistance wire resistance Keith measured voltage drops losses connectors under heavy current conditions associated operation models used test current level 20 amps measured voltages appearing across connector elements determined contact resistance version Ohms law thus Resistance age divided Current R connectors tested contact resistan ces CONTACT RESISTANCE milliohms Sermos Adams Jomar Deans 4-pin Tamiya Molex Astro gold 027005 035005 045005 09001 1401 4005 Using similar technique Keith compared resistance variety wire brands thus BRAND Jomar Belden Astro Jomar Lamp Cord GAUGE RESISTANCE milliohms/ft 1218 14277 13284 16444 16594 What does mean Its easy Connector contact resistance wire resistance causes volt age loss motor current flows means some battery voltage never gets motorwhich after its supposed go some losses Electric system cant anything aboutlike losses Ni-Cd cells fuses necessary make work does pay reduce can control much possible Read relevant real-life experience Just show can really add up something significant just helped friend fellow club member troubleshoot very unimpressive co balt geared 05-powered Viking seven 12 Ah cells SC4 speed control particularly heavy should ordinarily fly great hardly flew made some quick measurements field total volt age loss nearly two volts between battery terminals motor terminals checking further clear instal lation unusually large amount wire cause rather long separations motor battery switch speed control etc Furthermore wire used varied gauges consisted pieces varied connectors join ing together Guaranteed trouble offered take plane home tidy up installation done measured less 500 millivolts drop battery motor including speed control wiring fuse switch motor loaded draw 20 amps result plane flies just greatlike should see power loss approximately pro portional SQUARE voltage lossso little loss can go long way toward making Electric unimpressive Moral Pay attention wiring installation detailsit can make difference between No Go Go Sermos Snap Connectors Its littleknown fact Sermos Snap Connectors available colors other familiar red black color options available di rect hobby shops fact have some blue green orange yellow-and-white ones variety useful installation connector pair want sure connect wrong things together easy everything either red black Price same$3 per connector pair Now assembly tip finished solder ing wire metal contacts Snap Connectors wipe silver-plated contacts off well solvent such acetone done remove solder flux may likely have coated mating area result little lots contact resistance no contact small brush cotton swab tissue soaked sol vent will good job Dry part another tissue prior installation plastic housing Th-Th-Th-Thats folks end another column have yet include promised final report motor/ prop/battery testing Caliph Sorryit will have wait will say writing have accumulated 231 flights labors ful fill promise Also Ive made another wingwith aileronsbut like Caliph original wing better Anyway just too other items cover herethis being annual issue after Nats issue Ive two months accumulate column material fertile time year happen summer Now close column go back very beginning read what says Write medirectly Please send comment question SASE please Bob Kopski 25 West End Dr Iansdale PA 19446 RC Giant Scale/de Vries Continued page 51 mouthwatering extreme going hold list close chestor Bill would spend time answering letters rather drafting great construction drawings Although subject column Giant Continued page 152 OPS Mmxi 30 designed strictly model use incorporates extra long stroke turn large props heavy scale planes five intake ports Gilnisil plating give better breathing higher RPM along longer cylinder life both statically dynamically balanced comes roller bearings both ends steel rod DellOrto pump carb operates mixture methanol 50b oil proud engine would like learn its qualities Send free engine test December 1987 149 BRAND gsPjPIe 9m*t4 PO Box 26247NEW ORLEANS LA 70186 1-800-535-2568