Radio Control: Electrics

IR ADHO CONTROL THE GOLD came home Holland .L United States F3E team August historic first US since several attempts previous years ended disappointment year turn US now beat future team victory made possible individual high scoring team members Jerry Bridgeman second Right photo use shunt connected motor lead digital voltmeter plugged tip jacks Note rubberband around test leads wing hold-down dowel keep former safely out prop Model Skyvolt Below simple current shunt discussed text Note two Sermos connectors carry motor current two tip jacks meter connection ELECTRICS all Jason Perrin third Steve Neu seventh Austria Germany came second third respectively 39 pilots represented 13 countries since its obvious question advised US fliers used highly modified customized Astro cobalt 60s jobanother first well dominant motors year Astro Keller Platenburg information nature F3E activity please refer column May June 92 issues Model Aviation Congratulations Jerry Jason Steve Electric Connection Service has two modelers list month First up Steve Gurley 1104 E Campus Dr Tempe AZ 85282 Steve wrote tell about first Arizona Model Aviators Electric Fun-Fly held July 11 event took place Spook Hill flying field near Phoenixthe site 90 Top Gun Invitational Steve very pleased results first-ever meet went enthusi astically describe some activity detailsuch helicopter flying also interested attracting area folks Electrically oriented Please get touch Steve join local Electric fun Dont forget tell im Bob sent ya Next up father-and-son team Charles Carl Varvaro 420 E Newmark Ave F Monterey Park CA 91754 Tel 818 307-9070 modelers have great time flying wide variety Electrics recent years pretty much alone anxious attract others immediate area join Electri-flying fun Now its movelook em up gang start working club nameokay Best wishes Steve Charles Carl individual Electric pursuits thrust attract interested modelers Dont forget let know goes guys Just suspectedthe October 92 column photo captions got art treatment just like discussed last month September ones Ive since hammered Editorial Production folks magazine get change ways keep technical information captionsjust like write em two photos top page 64 October 92 issue plane A-scale Mustang based Pica kit 20-lb model features retracts retract doors flaps Citabria lower left corner same page powered direct-drive sport-wind version ary1993 87 Large picture below Fully instrumented test setup Kyosho 9 x 8 turning 6000 rpm motor current 238 amps battery voltage 82 volts Geared cobalt 05 eight 1200s WE ARE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SMUTS 36 46 30 BALSA STICKS3648 1/162331/18x1/410 3/32x2401/18x3/811 1/82431/161/215 3/162493/32x11412 1/42563/323/813 1/32x3373/32x1/217 1/203371/8x1/809 1/1633749 311/8x1/412 3/32x34458 371/8x3/813 1/835674 451/81/218 3/1638384 553/16x3/1612 1/437598 813/18x3/818 5/16x3871153/161/222 3/8390128 711/4X1/418 1/2x31141601/4x3/821 3/431702001/4x1/222 1/1645876 481/43/434 3/3247297 561/4x. 1A2 1/8482109 885/165/1623 3/18x496126 753/8x3/829 1/44115139 843/8x1/233 3/8x4170235 1443/8x3/444 1/24235273 2003/8s154 MATCHED SHEETS421/2x1/238 3/32x4 1/23/448 1/8 x4 1/2x160 3/164 5/8x5/852 1/4 4 3/4x3/475 ie i V BALM TRIANGLES 36 141425 383830 121/238 34 3446 1~65 BALSA PLANKS36 11 90 12157 13219 1429/3 1103302 1104396 22231 23326 24416 33616 34716 TA PS *80 SHEETS36 142 66 43 86 38x2 68 383 98 123120 LIGHT 4-6 LB WOOD 36, 1/32x378 1/2078 1/1678 3/3293 1/8114 3/16132 1/4157 3/8188 1/2238 3/4375 1532 1/16123 3/32149 1/8169 3/16197 1/4237 3/8357 1/2482 18 19 24 19 21 31 2654 28 32 45 57 38 39 49 58 73 55 86 82 70 98 LONESTAR EPOXY List 10991 oz Thick300 5 Mm6691 ox Thin300 15 Mm6692oz Thick550 30Mm6892ozThin550 TRilLING EDGE 36 1/4I32 5116111439 3811/246 1/22~ill serious modeler want performance must try 4-6 lb balsa BAUWD 316316 316114 31638 318112 31634 14114 114318 114314 318218 318112 318314 12112 123/4 48 26 30 39 46 80 42 49 811 60 70 90 90 100 BUNDLE DEALS 20-1/1 8x3x38899 20-1/184381035 20-3/32338875 1 5-3/32x4x36999 15-1/8338775 10-1/8438775 153/16338940 10-3/18436899 10-1/4338699 10-1/44381090 1 0-3/83x36890 5-3/8x436655 51 /2336540 51/24381110 10-3/32449938 51/8448525 53/1 6s4x48620 51/4449680 * NEW * Hundreds new sizes accessories finishing materials Send #10 SASE latest catalog SPBIICESTICKS 36 48 118 1181725 118 1142026 1/8 3182232 3183162838 1/4 1143450 1/4 3184066 114 1124665 363/64969 3l8 1126077 1/21126688 112 3/47687 SF MiCE TRIANGLES 36318 1121/2 3434 LIT PLYdV MARD MAPLE 1/4 3/6 3/63/8 3/612 31834 1334 BIRCH DO WEL S 18 316 14 616 36 16 40 46 65 58 68 36 09 1 14 25 32 3 PLYBIACH 48 18412 13212550 11612550 11812496 5 Pt YBIRCH 48 3/3212725 1/8x12800 363/1612625 1/412650 e3/812750 811/212825 MiNIRlS BALSA HOT LINE1/86175lZhch Cal1 606 745 6394 10. 6pm Centre r.1812380 3/83/45/32 1463751/23/43/161 50 14125J0 LONE STAR MODELS Cont 48 States Handling Charge $500 pay UPS Add $400 COD $500 extra PP APO FPO 123 5711 St Lubbock TX 79412 accept VISA MC Disoover personal checks 0006340/ tax Texas US currency Mm wood order $1000 stro 60 32 1 500-mAh cells controlled Jomar SC6 Prop APC 16 x 12 All-up weight 12 lb 18-oz loading typical flight over eight minutes mild aerobatics lower right-hand photo Electron uses pattern-wind 60 turn 12 x 12 energy stored 28 1200-mAb Ni-Cd cells Dave Brown mechanical retracts used 65-lb Pucara page 65 used 11 x 9 props did four-minute flights information contained original written captions did wind up issue know specifically interested such details Im very much less happy having repeat information now Im really upset about situation two reasons information getting very late Im forced take up space repeating would better used other purposes Well least promised wont happen again Readers quick react comments recent issues regarding computers modeling particular reaction feeling regarding DOS-based PCs strong took two forms side attaboy sidethose readers clearly agreed systems terrible use other sideie readers pro-PC turned out both understanding helpful actually got several letters readers offered assistance struggle miserable system Now honest fully expected barrage pro-PC reaction since after folks routinely use stuff purposely strong expressing feelings toward both surprised very happily impressed offers Scone first-ever Arizona Model Aviators Electric Fun-Fly hold July 111992 near Phoenix eight participants brought 14 Electrics including helicopter Bad weather didnt dampen fun Look next meet announcement Steve Gurley photo finished 36-in 196-oz Wave built March 1954 MAN plans Vintage model microservo rudder-only SM5 throttle HiLine 50 6 x 4 prop Four 800s go Hitec Shredder 26995 Hitec twochannel transmitter Receiver power four 80-mAh cells cut 9V Ni-Cd Empty framework plus landing gear pictured 53 oz Model beautiful fliertypical 50s classic designs 88 Model Aviation OM CUT CONTEST BALSA Sheets One B Sanded Close Tolerances AAA Grade Dried ped 100% Continued poge 94 Electric Vacuum Bagging System Foam Core Wings $7495* Complete Easy Use Md *rpng & handng Calforn residents odd sales tax Send S3OO infomation package Dealer Inquiries Invited VISA Mastercard Accepted Pylon Racing/Hager Continued page 86 posterity throw away Paul has some very good points hey event agree disagree now time let people know feel let just two people make rules See next month trics/Kopski Continued page 88 help general absence defen siveness Ive said before holds trueyou folks greatest Thank taking time react whatever way did difficult tasks Electric modeler may face trying measure motor current Ordinarily task measuring current very easy fact nearly readily available multimeters come equipped principle practice needs to measure current connect current meter series currentcarrying circuit thats Easy huh So task difficult motor current What makes motor current measurement somewhat less simple fact power systems operate relatively high currentscurrent well past ranges found common multimeters Ive seen case ordinary meters have current ranges up 10 amps less just doesnt handle typical 20-something amps re used running through power systems Therefore some approach other simple application multimeter set current scale needed perform particular measurement ZENOAH& ERCOUPE TOM & J- KIlTEN ZINGER PROPS CARBON FIBER B&B DU-BRO GIANT SCALE SIGCB CECO REIDS 16 Main 5t flQIpS NT 4b5A 315-548-3779 point Id like refer some earlier issues column Beginning around March 85 continuing months column presented miniseries basic electricity particular December 85 issue discussed voltmeters current meters described worked April 86 issue presented extensive detail make highcurrent shunta device allow easily measure motor current system youre likely using can access references youll well ahead new readers cant still have age-old problem measuring motor current So everyone heres updated look easily meet measurement challenge paragraph above mentioned word shunt So whats shunt shunt another word specialized resistorin particular low-resistance precision resistor resistor deliberately inserted series circuit circuit current must flow through same time resistor such low resistance its presence does noticeably affect operation circuit Some photos month show current shunt its application measuring motor current planes shunt pictured made Steve Kowalski 28 Hillberry Lane Holbrook NY 11741 can see its very convenient use small coil wire actually short calibrated length ordinary heavy wire such used house wiring its outfitted Sermos connectors also outfitted two tip jackssmall connectors can plug common multimeter leads shunts accurate milliohm resistance Thats 000 10 ohmsprobably much less resistance model wiring have So what does anyway variation very basic law electricity says current flowing through resistor results proportionate voltage appearing resistor As specific example amp flowing through one-ohm resistor volt would appear across resistor shunt example Continued page 158 94 Model Aviation 4DUST DEVIL Slow Speed Mrobatics Trainer Uk Stability Super Short Take Off & Landing Span 75 60 Area 1020 aq $13995 CHINOOK Primary TrainerFun Fly Sport Plane IMAA Lega robatic Trainer 11 Span 81 $11995 Both have JT88 AIrfoil WHIRLWIND AIRCRAFT 3065 Windjammer Dr Colorado Springs CO 80920 719 2607622 7 days week VISA/MO May Comments proposed 1992-93 CL scale rules changes June Notes profile scale documentation Bob Furr X-Acto keyhole saw extension Tips strengthening profile model landing gear wing installation Tom Hampshire July WRAM Show report August Single-channel electronic control Fred Cronenwett Paul Matts Scale AirplaneDrawings Aviation Heritage Books Workshop hint Stan Novak September Twin-engine scoring question profile scale Scale speed question answered New British model magazine Contest activity GSCB fall meet rules changes October Profile models questions fuselage width vs wingspan need visible pilot cockpit Update profile model landing gear installation Notes new Bob Holman catalog B-17G comments Roy Fellows November 1992 Nats coverage December Scale model data bank Jim Daly Rocky Mountain Aeromodelers 1992 CL Championships contest report Electronic control video Fred Cronenwett Hint workshop Bob Furr Adjustable wing tip weight Book review Americas Top Guns [Editors note- Model Aviation prefers black-and-white photos assure best quality reproduction prefer have enlargements 5 x 7 size larger however author does have enlargement services readily available smaller prints negatives uncut strips please can submitted recommend Kodak TMAX 400 blackand-white Color prints can used photos articles sometimes covers recommend Kodak Ektar 100 color prints Kodachrome 64 transparencies] lectricslKopski Continued page 94 amp flowing millivolt would appear across Thus Steves shunt one-millivolt-per-amp shunt its clear motor running 238 amps example voltmeter connected shunt tip jacks would read 238 millivoltsjust pictured Simple huh voltage resulting current flowing shunt indicator actual current value As can see photos using shunt real snap everything off airborue power system just open up set Sermos connectors already have place motor circuit snap series Sermos connectors shunt reestablish complete circuit Set digital multimeter lowest voltage range usually 200 300 millivolts plug shunt tip jacks Its important observe polarity backwards connection would simply display s sign displayed number important everything safely place test leads fingers etc well away prop set arming switch effect motor operation latter statement means whatever normally make motor run such send proper throttle signal whatever amp thats flowing motor should now register meter millivolt thats folks Simply put milliohm shunt number millivolts displayed number motor amps can get very own calibrated shunt pictured complete Sermos connectors test tip jacks sending Steve $8 Steve tells hes doing simply outgrowth having made order kits call 1-800-327-7198 log fine kits send $400 Idaho Residents Add 5% State Sales Tax 158 Model Aviation 4 VIDEOS 1 FREE #17-92 SCALEMASTER CHAMPS LONESTAB MUS PIMA AIR MUS ALABAMA 2 Hrs.$1995 #16 DROME 92 GUNTERSVILLE AL s US NAVAL AIR MUS ACOLA R 2 Hrs.S1995 #159 WORLD SCALECHAMPSAMAINVTLSHOOT OUT W INTL SCALEMASTERS 2 Hus.$1985 #1412 NW SEAPLANE CHAMPS EN SCALE AVIATION IN AUSTRALIA2 Hrs.S1995 913 92 top Gas Innitati oledo Model taps Weehs Air -Mrjseum2 Hrs.S1995 812 91 Scalenrasten Las Vegas 9t 0SAA. Las Vegas 2 Krs.61995 Eu -91 NWtnt IScalemaster drome 92 Preview FssMlg Visit Wittan Parsons W Seaplane Champs 2 Hrs.S1995 810- 9t taei Gas W Palm hctr Fl SAA Las Vegas W l tape2 Hra.51995 Z9O 90 Scalenrasters Champs Irving TX tridbey ml Scalemasters ax Diego Aerospace Mos 2 Hrn.S1995 98 90 NW Intl Scalemasters Farragut Park-Athol ID zttiamplis Figoter Maseam wftsa Proctor W Seaplane ChampsSanta Monica Mus ol Flying2 Hrn.S1995 97 p Gas Inaitatiosal Mesa AZ90 NW Model tsps2Hrs.S1985 96 89Scalemasters Champs St Louis Bake llansoo eider Cup Races2 Hrn.S1O95 95 89 US NaIls Scale & Seaplanes 89 NW Seaplane ps Planes Pasre tast MaO tAA Mus OstikosO Visit z wIRaIsli Bech ago Mu 01 So & IsV 2 Hrs.51895 9499 909 Gas Champs Coral Springs FL tor Albatron g OVA Preniew at Seaplane Sits NW ntl emasters tor N-t 1 Test Flight Martins R3C 4 Curtiss Racer2 Hrs 91995 U-.- 93- 87 Las Vegas Scalemasters Champs tor Jenny Test Flight 88 Scalemasters Champs Ft Knox Museam Sig MIg USA F Maseum d Engines tor N-29 Ceest & Tent Flight Seaplanes4 HisSlO95r 92-68 Scaleenasters Champs Ft Knox Maseam MIg Tear Maseum Tsar World tngises tor N 28Test Flight 88 NW Seaplane ChrarnpsProctor N2BCsnsl Byron Ihasger Tsar2 His1695 91 81 Lax Vegas Scatemasters Champs tor Jenny Prototype Tour Proctor Enterprises tor Jenny Tent Flights 82 NW Seaslane Champs 3 Hie 45 MIe . $1905 Special Edrhon tar Pine Enleeprioas AlbaIrso OVA Briel CosoIn Engine & Radio InstallS test Flights 2/Irs $1995 Canine JNAD Jenny Plans- FUll SCALE tOO inches 1894 sg 91 lbs B sheets w/rsstroctisss 91995 10807 SE STACY CT PORTLAND OR 97266 PHONE 503 653-2578 503 678-1342 PAL & SECAM ORDERS CONCEPTS 17 MILPERA CRESCENT WANTIRNA VIC 3152 AUSTRAUA ne FAX -90r-3B99 BETA IKON offers largest selection giant scale kits world 1/4 SCALE 90 1/4 SUALI Yb shunts own use some club members think about price steal given Steve must buy connectors make shunt calibrate Its essentially freebie folks however few considerations keep mind using low-output copper shunt First copper temperaturestable fact its resistance increases about 4% per 100C means can get erroneously high readings elevated temperatures course lower readings under cold conditions other hand now have no effective way measure motor current really bad have two shunts myself find usually convenient use own temperature-stable described April 86 MA reference above Another consideration associated measurement accuracy displayed meter reading read specifications describe multimeter youll find specified accuracy associated measurement youll also find lowest readings may affected example typical economy multimeters attempting display millivolt out 200-millivolt range could actually have error several millivolts test evaluated eight economy Radio Shack meters three different types well much better quality lab meter found excellent agreement among simple test can perform add credibility such measurements get two voltage readingsone meter lead polarity read shunt voltage meter leads connected tip jacks both ways normal reverse compare results technique will show up meter offset near zero can simply average two resulting readings fact different meter no significant zero offset should produce same magnitude number " sign effect meter specifications tell what meter error possible However its observation typical meter performance usually much less pessimistic Incidentally found some autoranging meters trouble motor current measurement occurred because motor noise seemed confuse meter constantly tried find right range within operate didnt try think could corrected installing large capacitor across meter leads near meter near shunt several tens hundreds microfarads should Otherwise suggest using meters manually set range Finally Im going added detail just aware applications comparative measurements important absolute accuracy example lets say youre interested current drain associated different props nominal real error associated current drain prop size current value different prop size com parably error too However difference two readings still very good indicator prop effects own right So youve struggling motor current measurements consider Steves shunt economical approach tricky problem Im sure youll pleased Thanks Steve showing great idea June 92 LVRCS meet So concludes first column new year Please enclose SASE correspondence youd like reply just think few issue months will spring again Happy Electric Landings ld-Timer/Baker Continued page 105 outdoor free flight activities heavy Old-Timer stuff Ten bucks cash money order will get subscription please send check drawn US bank editor publisher Dan OGrady 50 Largo Cresc Nepean Ontario Canada K2G3C7 Tel 613 224-3424 So until next time thermals CYMRU R PRODUCTS SM-4 Electric Throttle best bargain Long Run SM4 runs 7 24 cells handles over 50 amps current optically isolated high rate includes Futaba P lead sermos connectors heataink plastic cover Weight 13 ounces Smooth reliable performance Best 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IR ADHO CONTROL THE GOLD came home Holland .L United States F3E team August historic first US since several attempts previous years ended disappointment year turn US now beat future team victory made possible individual high scoring team members Jerry Bridgeman second Right photo use shunt connected motor lead digital voltmeter plugged tip jacks Note rubberband around test leads wing hold-down dowel keep former safely out prop Model Skyvolt Below simple current shunt discussed text Note two Sermos connectors carry motor current two tip jacks meter connection ELECTRICS all Jason Perrin third Steve Neu seventh Austria Germany came second third respectively 39 pilots represented 13 countries since its obvious question advised US fliers used highly modified customized Astro cobalt 60s jobanother first well dominant motors year Astro Keller Platenburg information nature F3E activity please refer column May June 92 issues Model Aviation Congratulations Jerry Jason Steve Electric Connection Service has two modelers list month First up Steve Gurley 1104 E Campus Dr Tempe AZ 85282 Steve wrote tell about first Arizona Model Aviators Electric Fun-Fly held July 11 event took place Spook Hill flying field near Phoenixthe site 90 Top Gun Invitational Steve very pleased results first-ever meet went enthusi astically describe some activity detailsuch helicopter flying also interested attracting area folks Electrically oriented Please get touch Steve join local Electric fun Dont forget tell im Bob sent ya Next up father-and-son team Charles Carl Varvaro 420 E Newmark Ave F Monterey Park CA 91754 Tel 818 307-9070 modelers have great time flying wide variety Electrics recent years pretty much alone anxious attract others immediate area join Electri-flying fun Now its movelook em up gang start working club nameokay Best wishes Steve Charles Carl individual Electric pursuits thrust attract interested modelers Dont forget let know goes guys Just suspectedthe October 92 column photo captions got art treatment just like discussed last month September ones Ive since hammered Editorial Production folks magazine get change ways keep technical information captionsjust like write em two photos top page 64 October 92 issue plane A-scale Mustang based Pica kit 20-lb model features retracts retract doors flaps Citabria lower left corner same page powered direct-drive sport-wind version ary1993 87 Large picture below Fully instrumented test setup Kyosho 9 x 8 turning 6000 rpm motor current 238 amps battery voltage 82 volts Geared cobalt 05 eight 1200s WE ARE SHOOTING DOWN HIGH BALSA PRICES WITH SUPER QUALITY Satisfaction Guaranteed Direct Only BALSA SMUTS 36 46 30 BALSA STICKS3648 1/162331/18x1/410 3/32x2401/18x3/811 1/82431/161/215 3/162493/32x11412 1/42563/323/813 1/32x3373/32x1/217 1/203371/8x1/809 1/1633749 311/8x1/412 3/32x34458 371/8x3/813 1/835674 451/81/218 3/1638384 553/16x3/1612 1/437598 813/18x3/818 5/16x3871153/161/222 3/8390128 711/4X1/418 1/2x31141601/4x3/821 3/431702001/4x1/222 1/1645876 481/43/434 3/3247297 561/4x. 1A2 1/8482109 885/165/1623 3/18x496126 753/8x3/829 1/44115139 843/8x1/233 3/8x4170235 1443/8x3/444 1/24235273 2003/8s154 MATCHED SHEETS421/2x1/238 3/32x4 1/23/448 1/8 x4 1/2x160 3/164 5/8x5/852 1/4 4 3/4x3/475 ie i V BALM TRIANGLES 36 141425 383830 121/238 34 3446 1~65 BALSA PLANKS36 11 90 12157 13219 1429/3 1103302 1104396 22231 23326 24416 33616 34716 TA PS *80 SHEETS36 142 66 43 86 38x2 68 383 98 123120 LIGHT 4-6 LB WOOD 36, 1/32x378 1/2078 1/1678 3/3293 1/8114 3/16132 1/4157 3/8188 1/2238 3/4375 1532 1/16123 3/32149 1/8169 3/16197 1/4237 3/8357 1/2482 18 19 24 19 21 31 2654 28 32 45 57 38 39 49 58 73 55 86 82 70 98 LONESTAR EPOXY List 10991 oz Thick300 5 Mm6691 ox Thin300 15 Mm6692oz Thick550 30Mm6892ozThin550 TRilLING EDGE 36 1/4I32 5116111439 3811/246 1/22~ill serious modeler want performance must try 4-6 lb balsa BAUWD 316316 316114 31638 318112 31634 14114 114318 114314 318218 318112 318314 12112 123/4 48 26 30 39 46 80 42 49 811 60 70 90 90 100 BUNDLE DEALS 20-1/1 8x3x38899 20-1/184381035 20-3/32338875 1 5-3/32x4x36999 15-1/8338775 10-1/8438775 153/16338940 10-3/18436899 10-1/4338699 10-1/44381090 1 0-3/83x36890 5-3/8x436655 51 /2336540 51/24381110 10-3/32449938 51/8448525 53/1 6s4x48620 51/4449680 * NEW * Hundreds new sizes accessories finishing materials Send #10 SASE latest catalog SPBIICESTICKS 36 48 118 1181725 118 1142026 1/8 3182232 3183162838 1/4 1143450 1/4 3184066 114 1124665 363/64969 3l8 1126077 1/21126688 112 3/47687 SF MiCE TRIANGLES 36318 1121/2 3434 LIT PLYdV MARD MAPLE 1/4 3/6 3/63/8 3/612 31834 1334 BIRCH DO WEL S 18 316 14 616 36 16 40 46 65 58 68 36 09 1 14 25 32 3 PLYBIACH 48 18412 13212550 11612550 11812496 5 Pt YBIRCH 48 3/3212725 1/8x12800 363/1612625 1/412650 e3/812750 811/212825 MiNIRlS BALSA HOT LINE1/86175lZhch Cal1 606 745 6394 10. 6pm Centre r.1812380 3/83/45/32 1463751/23/43/161 50 14125J0 LONE STAR MODELS Cont 48 States Handling Charge $500 pay UPS Add $400 COD $500 extra PP APO FPO 123 5711 St Lubbock TX 79412 accept VISA MC Disoover personal checks 0006340/ tax Texas US currency Mm wood order $1000 stro 60 32 1 500-mAh cells controlled Jomar SC6 Prop APC 16 x 12 All-up weight 12 lb 18-oz loading typical flight over eight minutes mild aerobatics lower right-hand photo Electron uses pattern-wind 60 turn 12 x 12 energy stored 28 1200-mAb Ni-Cd cells Dave Brown mechanical retracts used 65-lb Pucara page 65 used 11 x 9 props did four-minute flights information contained original written captions did wind up issue know specifically interested such details Im very much less happy having repeat information now Im really upset about situation two reasons information getting very late Im forced take up space repeating would better used other purposes Well least promised wont happen again Readers quick react comments recent issues regarding computers modeling particular reaction feeling regarding DOS-based PCs strong took two forms side attaboy sidethose readers clearly agreed systems terrible use other sideie readers pro-PC turned out both understanding helpful actually got several letters readers offered assistance struggle miserable system Now honest fully expected barrage pro-PC reaction since after folks routinely use stuff purposely strong expressing feelings toward both surprised very happily impressed offers Scone first-ever Arizona Model Aviators Electric Fun-Fly hold July 111992 near Phoenix eight participants brought 14 Electrics including helicopter Bad weather didnt dampen fun Look next meet announcement Steve Gurley photo finished 36-in 196-oz Wave built March 1954 MAN plans Vintage model microservo rudder-only SM5 throttle HiLine 50 6 x 4 prop Four 800s go Hitec Shredder 26995 Hitec twochannel transmitter Receiver power four 80-mAh cells cut 9V Ni-Cd Empty framework plus landing gear pictured 53 oz Model beautiful fliertypical 50s classic designs 88 Model Aviation OM CUT CONTEST BALSA Sheets One B Sanded Close Tolerances AAA Grade Dried ped 100% Continued poge 94 Electric Vacuum Bagging System Foam Core Wings $7495* Complete Easy Use Md *rpng & handng Calforn residents odd sales tax Send S3OO infomation package Dealer Inquiries Invited VISA Mastercard Accepted Pylon Racing/Hager Continued page 86 posterity throw away Paul has some very good points hey event agree disagree now time let people know feel let just two people make rules See next month trics/Kopski Continued page 88 help general absence defen siveness Ive said before holds trueyou folks greatest Thank taking time react whatever way did difficult tasks Electric modeler may face trying measure motor current Ordinarily task measuring current very easy fact nearly readily available multimeters come equipped principle practice needs to measure current connect current meter series currentcarrying circuit thats Easy huh So task difficult motor current What makes motor current measurement somewhat less simple fact power systems operate relatively high currentscurrent well past ranges found common multimeters Ive seen case ordinary meters have current ranges up 10 amps less just doesnt handle typical 20-something amps re used running through power systems Therefore some approach other simple application multimeter set current scale needed perform particular measurement ZENOAH& ERCOUPE TOM & J- KIlTEN ZINGER PROPS CARBON FIBER B&B DU-BRO GIANT SCALE SIGCB CECO REIDS 16 Main 5t flQIpS NT 4b5A 315-548-3779 point Id like refer some earlier issues column Beginning around March 85 continuing months column presented miniseries basic electricity particular December 85 issue discussed voltmeters current meters described worked April 86 issue presented extensive detail make highcurrent shunta device allow easily measure motor current system youre likely using can access references youll well ahead new readers cant still have age-old problem measuring motor current So everyone heres updated look easily meet measurement challenge paragraph above mentioned word shunt So whats shunt shunt another word specialized resistorin particular low-resistance precision resistor resistor deliberately inserted series circuit circuit current must flow through same time resistor such low resistance its presence does noticeably affect operation circuit Some photos month show current shunt its application measuring motor current planes shunt pictured made Steve Kowalski 28 Hillberry Lane Holbrook NY 11741 can see its very convenient use small coil wire actually short calibrated length ordinary heavy wire such used house wiring its outfitted Sermos connectors also outfitted two tip jackssmall connectors can plug common multimeter leads shunts accurate milliohm resistance Thats 000 10 ohmsprobably much less resistance model wiring have So what does anyway variation very basic law electricity says current flowing through resistor results proportionate voltage appearing resistor As specific example amp flowing through one-ohm resistor volt would appear across resistor shunt example Continued page 158 94 Model Aviation 4DUST DEVIL Slow Speed Mrobatics Trainer Uk Stability Super Short Take Off & Landing Span 75 60 Area 1020 aq $13995 CHINOOK Primary TrainerFun Fly Sport Plane IMAA Lega robatic Trainer 11 Span 81 $11995 Both have JT88 AIrfoil WHIRLWIND AIRCRAFT 3065 Windjammer Dr Colorado Springs CO 80920 719 2607622 7 days week VISA/MO May Comments proposed 1992-93 CL scale rules changes June Notes profile scale documentation Bob Furr X-Acto keyhole saw extension Tips strengthening profile model landing gear wing installation Tom Hampshire July WRAM Show report August Single-channel electronic control Fred Cronenwett Paul Matts Scale AirplaneDrawings Aviation Heritage Books Workshop hint Stan Novak September Twin-engine scoring question profile scale Scale speed question answered New British model magazine Contest activity GSCB fall meet rules changes October Profile models questions fuselage width vs wingspan need visible pilot cockpit Update profile model landing gear installation Notes new Bob Holman catalog B-17G comments Roy Fellows November 1992 Nats coverage December Scale model data bank Jim Daly Rocky Mountain Aeromodelers 1992 CL Championships contest report Electronic control video Fred Cronenwett Hint workshop Bob Furr Adjustable wing tip weight Book review Americas Top Guns [Editors note- Model Aviation prefers black-and-white photos assure best quality reproduction prefer have enlargements 5 x 7 size larger however author does have enlargement services readily available smaller prints negatives uncut strips please can submitted recommend Kodak TMAX 400 blackand-white Color prints can used photos articles sometimes covers recommend Kodak Ektar 100 color prints Kodachrome 64 transparencies] lectricslKopski Continued page 94 amp flowing millivolt would appear across Thus Steves shunt one-millivolt-per-amp shunt its clear motor running 238 amps example voltmeter connected shunt tip jacks would read 238 millivoltsjust pictured Simple huh voltage resulting current flowing shunt indicator actual current value As can see photos using shunt real snap everything off airborue power system just open up set Sermos connectors already have place motor circuit snap series Sermos connectors shunt reestablish complete circuit Set digital multimeter lowest voltage range usually 200 300 millivolts plug shunt tip jacks Its important observe polarity backwards connection would simply display s sign displayed number important everything safely place test leads fingers etc well away prop set arming switch effect motor operation latter statement means whatever normally make motor run such send proper throttle signal whatever amp thats flowing motor should now register meter millivolt thats folks Simply put milliohm shunt number millivolts displayed number motor amps can get very own calibrated shunt pictured complete Sermos connectors test tip jacks sending Steve $8 Steve tells hes doing simply outgrowth having made order kits call 1-800-327-7198 log fine kits send $400 Idaho Residents Add 5% State Sales Tax 158 Model Aviation 4 VIDEOS 1 FREE #17-92 SCALEMASTER CHAMPS LONESTAB MUS PIMA AIR MUS ALABAMA 2 Hrs.$1995 #16 DROME 92 GUNTERSVILLE AL s US NAVAL AIR MUS ACOLA R 2 Hrs.S1995 #159 WORLD SCALECHAMPSAMAINVTLSHOOT OUT W INTL SCALEMASTERS 2 Hus.$1985 #1412 NW SEAPLANE CHAMPS EN SCALE AVIATION IN AUSTRALIA2 Hrs.S1995 913 92 top Gas Innitati oledo Model taps Weehs Air -Mrjseum2 Hrs.S1995 812 91 Scalenrasten Las Vegas 9t 0SAA. Las Vegas 2 Krs.61995 Eu -91 NWtnt IScalemaster drome 92 Preview FssMlg Visit Wittan Parsons W Seaplane Champs 2 Hrs.S1995 810- 9t taei Gas W Palm hctr Fl SAA Las Vegas W l tape2 Hra.51995 Z9O 90 Scalenrasters Champs Irving TX tridbey ml Scalemasters ax Diego Aerospace Mos 2 Hrn.S1995 98 90 NW Intl Scalemasters Farragut Park-Athol ID zttiamplis Figoter Maseam wftsa Proctor W Seaplane ChampsSanta Monica Mus ol Flying2 Hrn.S1995 97 p Gas Inaitatiosal Mesa AZ90 NW Model tsps2Hrs.S1985 96 89Scalemasters Champs St Louis Bake llansoo eider Cup Races2 Hrn.S1O95 95 89 US NaIls Scale & Seaplanes 89 NW Seaplane ps Planes Pasre tast MaO tAA Mus OstikosO Visit z wIRaIsli Bech ago Mu 01 So & IsV 2 Hrs.51895 9499 909 Gas Champs Coral Springs FL tor Albatron g OVA Preniew at Seaplane Sits NW ntl emasters tor N-t 1 Test Flight Martins R3C 4 Curtiss Racer2 Hrs 91995 U-.- 93- 87 Las Vegas Scalemasters Champs tor Jenny Test Flight 88 Scalemasters Champs Ft Knox Museam Sig MIg USA F Maseum d Engines tor N-29 Ceest & Tent Flight Seaplanes4 HisSlO95r 92-68 Scaleenasters Champs Ft Knox Maseam MIg Tear Maseum Tsar World tngises tor N 28Test Flight 88 NW Seaplane ChrarnpsProctor N2BCsnsl Byron Ihasger Tsar2 His1695 91 81 Lax Vegas Scatemasters Champs tor Jenny Prototype Tour Proctor Enterprises tor Jenny Tent Flights 82 NW Seaslane Champs 3 Hie 45 MIe . $1905 Special Edrhon tar Pine Enleeprioas AlbaIrso OVA Briel CosoIn Engine & Radio InstallS test Flights 2/Irs $1995 Canine JNAD Jenny Plans- FUll SCALE tOO inches 1894 sg 91 lbs B sheets w/rsstroctisss 91995 10807 SE STACY CT PORTLAND OR 97266 PHONE 503 653-2578 503 678-1342 PAL & SECAM ORDERS CONCEPTS 17 MILPERA CRESCENT WANTIRNA VIC 3152 AUSTRAUA ne FAX -90r-3B99 BETA IKON offers largest selection giant scale kits world 1/4 SCALE 90 1/4 SUALI Yb shunts own use some club members think about price steal given Steve must buy connectors make shunt calibrate Its essentially freebie folks however few considerations keep mind using low-output copper shunt First copper temperaturestable fact its resistance increases about 4% per 100C means can get erroneously high readings elevated temperatures course lower readings under cold conditions other hand now have no effective way measure motor current really bad have two shunts myself find usually convenient use own temperature-stable described April 86 MA reference above Another consideration associated measurement accuracy displayed meter reading read specifications describe multimeter youll find specified accuracy associated measurement youll also find lowest readings may affected example typical economy multimeters attempting display millivolt out 200-millivolt range could actually have error several millivolts test evaluated eight economy Radio Shack meters three different types well much better quality lab meter found excellent agreement among simple test can perform add credibility such measurements get two voltage readingsone meter lead polarity read shunt voltage meter leads connected tip jacks both ways normal reverse compare results technique will show up meter offset near zero can simply average two resulting readings fact different meter no significant zero offset should produce same magnitude number " sign effect meter specifications tell what meter error possible However its observation typical meter performance usually much less pessimistic Incidentally found some autoranging meters trouble motor current measurement occurred because motor noise seemed confuse meter constantly tried find right range within operate didnt try think could corrected installing large capacitor across meter leads near meter near shunt several tens hundreds microfarads should Otherwise suggest using meters manually set range Finally Im going added detail just aware applications comparative measurements important absolute accuracy example lets say youre interested current drain associated different props nominal real error associated current drain prop size current value different prop size com parably error too However difference two readings still very good indicator prop effects own right So youve struggling motor current measurements consider Steves shunt economical approach tricky problem Im sure youll pleased Thanks Steve showing great idea June 92 LVRCS meet So concludes first column new year Please enclose SASE correspondence youd like reply just think few issue months will spring again Happy Electric Landings ld-Timer/Baker Continued page 105 outdoor free flight activities heavy Old-Timer stuff Ten bucks cash money order will get subscription please send check drawn US bank editor publisher Dan OGrady 50 Largo Cresc Nepean Ontario Canada K2G3C7 Tel 613 224-3424 So until next time thermals CYMRU R PRODUCTS SM-4 Electric Throttle best bargain Long Run SM4 runs 7 24 cells handles over 50 amps current optically isolated high rate includes Futaba P lead sermos connectors heataink plastic cover Weight 13 ounces Smooth reliable performance Best market Dont settle less Non $110 GLITCH Buster 6 CHANNELS OPTICAL Isolation PLUS Reliable SIGNAL BOOST long servo runs high power jumbo servos1 Must used separate servo battery pack Eliminates glitches caused long leads big servos flying tail wires Allows new PCM radios drive ANY type servo! add own input/output leads Measures 15 X 15 X 75 weighs 3/4 ounce Still just $45 Battery Backer use 4 S cell packs main other backup Backup kicks main pack craps out Capable handling current youll ever need Cheap peace mind expensive project! Buy before s too late measly $49 GLOW SWITCH TINY 1 X 15 X 4 half ounce unit can handle up 200 watts load Optically isolated unit replaces mechanical switch servo Simple 2 wire hookup just like regular switch! High OR Low side switching Includes indicator LED reversing switch point adjust futaba lead Great Video camera smoke fluid pump glow plug power igmtion system switch etc. Only $39 Lots other stuff too. like super fine wire #22 #15 #12 gauge simple ON/OFF motor controls etc Also R/C related consulting services reasonable rates! 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