Radio Control E lectrics Bob Kopski BEGINNERS Based incoming mail Elec tric enjoying strong steady growth new participants joining get lots mail substantial portion modelers new Electric folks usually have beginner questions such Im continually reminded need keep substantial percentage column allocated covering need personally know very easy experi enced modelers take some basic things granted may major impasses first-time Electric modelers some example sub jects Batteries Ive said before continues true batteries related matters continue bring questions some infor mation common points confusion photos shows variety nickelcadmium cells types used RC system packs and/or Electric power systems photo clearly shows variety physical sizes have time another used sizes table below lists some particulars cells can easily see photo table what would expect higher cell capacity ampere-hours Ah larger heavier cell Simple say Yes necessarily first-time Electric modelers may have some advice local expert about5002300811 some magic cell ighs half much6002680945 runs longer Well far know there8003351182 no such magic cells ampere-9503991407 hours capacity cell has larger is12005081792 physically heavier thats 46 Model Aviation Cell Capacity CellWeight Nominal mAhgramsounces 70560198 100740261 2751350476 Exclusive photo some aspects forthcoming new unbelievable motor Unipolar design requires brushhere connected power wire Sermos 600-amp connector little prop isa standard B x 3 shown comparison supersecret field magnets made rare-earth Unobtainium allowed photographed Avarletyof Ni-Cd ceils ranging capacityfrom 70 mAh L 1200 mAh R Celivolume weight closely proportional capacitybut have same nominal terminal voltage 12 volts isa function cell chemistry cell size Author Kopski addresses topic months column table can provide some interesting insight example drew plot showing cell weight nominal capacity grid paper guess what Its essentially straight line What means cell weight cell capacity essentially linearly related want double motor run time other things being constant must essentially double bat tery capacityand weight dont let anyone L array so-called 05 motors ones shown have power-handling capacity ranging about 80 watts over 150 watts Gear belt speed-reducers change basic capability motor So lust what 05 second photo R further Illustrates confusion over motor size motors include so-called OSs 075s 1 Os 15s 25s1 Most labeled Lack motorspecification standards make very difficult know whats what what once youve got Author Bob Kopskl proclaims Electric has matured point meaningful standards necessary tell different Incidentally nominal capacity table above advertised label value cells shown Nickel-cadmium Ni-Cd cellsno matter what sizehave same terminal voltage cell see photo has same voltage output nominal loads Thus both tiny 70 mAli milliampere-hour cell familiar 12 Ah 1200 milliampere-hour cell have same nominal 12 volts output However under very heavy current loads such required motors actual cell voltage decreases somewhat due losses internal cell resistance voltage depression gener ally greater smaller cells battery group cells connected gether hobby almost always series connection means cells wired end-to-end battery voltage total sum cell voltages Thus fourcell battery has terminal voltage 4 x 12 48 volts very important cells ins battery same capacity size Thus always uses example 12 Ah cells same batteryor 800 mAh cells same battery never mixes other sizes Battery charging current always deter mined cell size independent number cells Thus like charge empty 12 Ah packs 42 amps 15 minutes no matter cells pack So summary Ni-Cd cells available wide variety sizes capacities expressed ampere-hours cell volume weight essentially directly proportional capacity such cells have same nominal terminal voltage 12 volts battery composed cell cells must same size Finally battery charge current related cell size number cells Additional in-depth discussions other battery topics can found inthe December 1983 issue Model Aviation Electric supplies Charles Sylvia Middleboro MA has gradually building Electric related supplies business offers reliable mail order service attractive pricing Charlie has catalog wares normally costs some coins Charlie making special offer readers column can get new catalog free simply telling Charlie read about column always knew valuable column Send letter CS Flight Systems 31 Perry St Box 775 Middieboro MA 02346 telephone number 617 947-2805 Motor size continuing trouble-spot rapidly-growing area Electric always question motor size related question What motor goes what plane beginning early Seventies long ago far away very dawn serious Electric interest country simple size descrip tion Electric motors put place simply describe motors terms familiar gas engines Thus now-commonplace 05 Electric taken mean motor would turn same prop fly same plane everyday sport 049 glow engineexcept weight considerations course Electric has come long way since early Seventies original size designation scheme has continued place However what Continued page 146 1 WHY VIETNAM Color black awl white 60 minutes VHSB TARGET FOR TODAY Black white 60 minutes VHS Official US policy involvement Vietnam recounts Made under operational conditions members combat victorious banle ot KHE-SHANcamera units United Kingdom 1943 2THE MEMPHIS BELLE Color 43 minutes VHSB FIGHTER BOMBERS Color 70 minutes VHS Takes actual combat mission deep Germany sequences far some ot spectacular ever EXCITINGfilmed ot war 1mm air 3 THE TRUE GLORY Black white 85 minutes VHS Normandy landing Germanys sarrendw 4 WAR IN THE PACIFIC Black wEte 60 minutes VHS Pearl Harbor New Guinea invasion otthe Phillippines 5 NUREMBERG TRIALS Black wllte 76 minutes VHS Much footage confiscated private Ibraries ot high Nazi officiulo S HISTORY OFTHE KOREAN WAR Biockand white 60 minutes VHS detinifive bivody record Koreas savage contlict immor talized combat cameramen 7 THIS IS GERMANY Black whife60 minutes VHS unhistorical documentota time after madness overcame mankind Postage paid US Canada/Foreign orders add $500 Fin res add 5 percent Sales tax accept Mastercard Visa American Express MD COD Include No Exp date 10 FLAK JUGS AND COBRAS Black white 96 minutes VHS Flak avoidance iv B-f flying P-47 Thunderbolt P-39 Air Cobra 11 NAZI CONCENTRATION CAMPS Black Whde 60 minutes VHS Irrefutable testimony lesson world must never forgetl 12-15 THE AIR FORCE STORY Vat weeg I-IV Black White t20 minutes VHS Over seven hours aerial combat tour videocassenes Wright Brothers dogfights Migs Send COMMAND POST VIDEO PO Box 1500 Crestview FIn 32538 April 1987 47 * Better quality tapes selling for2 3 times much * rAIIJI makers EWWW HEAD LOCK 1-IEADLITE MODEL PRODUCTS CORP PO BOX 100 ALLAMUCHY NEW JERSEY 07820 following formula Load spring rate 0000d4 S D3 N terms have following meanings 11500000 torsional modulus elasticity music wire small d wire diameter large D springs mean diameter its outside diameter minus wire diameter N number active turns including closewound turns spring ends 8 constant formula gives us pounds per inch deflec tion beginning springs free length Adjust free length during winding space between coils keeping mind must fit within strut find load point springs deflection multiply rate determined means formula hy deflection decimal inches get load initial final positions landing-gear travel Remember spring already partially loaded re hound spring used landing gear full size practice Typically airplane weighing 12 lb spring wound 055-in-diameter wire outside diameter 406 having 22 active turns could installed within 500-in GD strut 12 lb distributed six lb leg main gear will produce deflection model rest about 4 dimension somewhat reduced because part models weight supported nose gear tail wheel hut reality ahsorbing landing shocks main gear Wound free length 262 such spring could deflect total 125 absorh landing load 17 lb legor roughly three times models weight spring GD 406 055-in -diameter wire will have inside diame ter 296 Because tendency increase diameter after winding spring wound 25-in-diameter mandrel length wire turn 11 22 turns plus two inactive turns end length wire needed shout 29 Add several inches gripping plier 36-in hohhy shop length wire sufficient spring As indication amount spring-hack wire after winding changing mandrel diameter 28 yields spring GD 43 Bob Dolly Wischer S-221 Lap/tam Peak Rd Delafleld WI 53018 RC Electrics/Kopski Continued page 47 once convenient meaningful way describe motor size early days now m view no longer good approach two ways can illustrated first commercially-made Electric system 05 motor eight 055 Ah 550 mAh cells Astro system gave years service fact still have well-worn motor recall measwing system perform ance specified prop operating power level just about 75 80 watts mind number stock 05 power Now understand new Astro cobalt 02 can operate about same power level Another way see such size ratings dubious value realize contemporary cobalt 05 fully capable handling over twice power first 05 system beyond new Astro FM cobalt 05 goes much farther regard Yet three motors about same physical size weight called OSs So real 05 Considering power-handling abilities Ive just described directly affect well such motors can fly given plane its no wonder would-be Electric fliers experienced ones well get confused Incidentally please note nowhere above did say mentioned motors has less power otherfor motors have power Rather motors have lack ability handle varying power levels Anyway seems clear enough 05 other such designation doesnt mean much anymore So think its time change Ithink its time appropriately describe standardize what meant motor size think modeling industry modeling consumer need standard makes sense wont become outdated changes technology new entries model motor field opinion Electric Aeromodeling Association EAA best-positioned group establish control matter think because EAA official Special Interest Group Electric designated AMA also think its right group because left itself bickering industry will never come up standards Finally Ithink time now Quite naturally Ive got some ideas own subject since Ive just opened up topical area am now going pass along Rememberyou read first Model Avia lion 146 Model Aviation 1 STAIM.ESS STEEL HEAD LOCK glow plug connector strength & long corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOIIATIC ON/OFF SWITCH prevent short circuits pocket tool box 4Charger LED INDICATOR available What motor size should First believe Electric motor size should refer way gas engine size Second believe motor size should no way related indicative physical motor dimensions characteristics material makeup Third believe size should no way tied specific battery description per Se What motor size should believe Elec tric model motor size should described such ways modelers can easily relate motors manufacture other model size requirements believe Electric model motor size should specified described just like motors other application arein elec trical power terms two basic thoughts completely consistent other understand what mean take look around house Look vacuum cleaner weed trimmer fan air conditioner electric drill different applica tions electric motors Yet have nameplates describe motor capability various combinations suitable terms including voltage current horsepower rpm etc Taking long-established standard ap proach adapting modeling use herein suggest describing model motors follows FirstPower Rating tells big motor Model motor nameplates should specify both Nominal Power Maximum Power Nominal Power would highest oper ating input power manufacturer would assure motor would operate continu ously failure-free some minimum EAA standardized time perhaps 100 hours would highest power average modeler would routinely use perfectly satisfactory flying fun would power used adver tise describe motor eg 200watt motor Maximum Power would some much higher power level motor might safely operated intermittently much shorter EAA-standardized time perhaps minute followed cool-down two ratings would describe given motor both sport competitive applica tions same time give meaningful useful guide what model size motor suited would much appropriate way presently-used displace ment analogy SecondCurrent Rating input amperes motor nameplate should specify both Nominal Current Maximum Current Nominal Current would highest input current continuous operating duty would current Nominal Power has specified Maximum Current would highest input current could safely tolerated short intermittent runs eg minute ThirdVoltage Rating cells motor nameplate should give both Nominal Voltage Maximum Voltage ratings Nominal Voltage would voltage along Nominal Current value would needed attain Nominal Power Maximum Voltage would highest voltage could applied unloaded no prop motor such resulting rpm would damaging motor factor will discussed next FourthRPM what your tach reads Continued page 154 April 1987 147 woilcfs starter system worlds integrated system starter parts starts accessories gets off superior start Hi-Tork Dynatron Hi-Tork Starter worlds powerful standard starler Hi-Tork features several innova tive safety features including patented hand guard keep hands away propeller starter switch located below handgrip help prevent accidental starts heavy-duty Dynatron Starter delivers one-third maximum power 12 volts closest competitor 47-69% torque standard 12volt starters greater output Dynatron can used 24 volts Equipped patented safety guard Dynatron backed frill two-year warranty against manufacturing defects Both outstanding starters made USA compatible other Sullivan products exemplify dedication high quality technol ogy Youll find Sullivan starters accessories dealer near Get off safe trouble-free start time Sullivan Determined leading independent testing laboratory 77FFMfR 706VR JPDUC no fly near overhead etectrcpower nes OorNohHavei5 ec PO Box5 66Ba oio MD2 224 30 732 3500 14Ye4//D RADIO CONTROL P-51 MUSTANG 25 TO 45 ENGINES WING SPAN 55 2995 THIS IS THE SIXTH RELEASE OF OUR INCREASINGLY POPULAR EASY-BUILD SHORT KITS THE REALISTIC LOOKING MUSTANG FLIES LIKE DREAM WITH FLENTY OF WING AND TAIL AREA FOR FULL-RANGE FOSITIVE CONTROL AS WITH ALL OUR SHORT-KITS THE MUSTANG IS DESIGNED AROUND FOAM WING AND BOX FRAME FUSELAGE FOR SIMPLE AND STURDY CONSTRUCTION WE FURNISH THE ESSENTIAL PARTS ALONG WITH EASY-TO-FOLLOW PLANS AND LET THE BUILDER SELECT HIS OWN WOOD AND ADDITIONAL HARD WARE SHORT KIT INCLUDES PRECISION CUT ARCOFOAM WING CORES ABS HIGH-IMPACT COWLING AND BELLY COOLER FORMED WING GUN PORTS AND EXHAUST CRYSTAL CLEAR CANOPY WITH FRAMEWORK PLYWOOD FIREWALL LANDING GEAR STRAPS BLOCKS AND SCREWS FORMED STEEL ENGINE MOUNT CONTROL SURFACE HINGES CLEAR PLANS WITH CONSTRUCTION DETAILS AND ALL NECESSARY TEMPLATES o BILL OF MATERIALS NO BALSA INCLUGEDI ORDERING SEND CHECK OR MONEY ORDER FOR 2930 PLUS i430 POSTAGE CANADIANS ADD 6501 TO WING MFG PO BOX 33 CRYSTAL LAKE IL 30014 ILLINOIS RESIDENTS ADD t// SALES TAX ALL ORDERS MUST BE IN US FUNOS SEND 350 FOR PRODUCT CATALOG DESCRIBING OUR COMPLETE LINE OP FOAM CORE REPLACEMENT WINGS ACCESSORIES KITS TOOLS AND MUCH MORE CATALOG FREE WITH ORDER c PHONE vi 815-459-0417 Matched PerTormance TOP PERFORMA K&R ENGINES ApIaneMarine K&B FUELSK&B GLOW PLUGS 9 Blends4 Choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B MicroBalloons FILLER K&B SUPER FOXY RESIN K&B SUPER POXY THINNER K&R SUPER POXY PRIMER K&B SUPER FOXY PAINT K&B MIXING CUPS K7s4E HO BRYN TOE AWAYHO SB OIIIDE AWAYHn RBYH TOE AWAYNO BBYHT DC AWAY 22 long 9sipuo CONCORDE Slingshot glider kit PP FAMOUS BRITISH DIESELS ALOG-DIESEL HANDBOOK pp HOBBY HIDEWAYDELAVANIL 244-7389 61734 HOBBYHOEnWAYHORBYHIOEAWAVHOBBYHISEAWaY9IOBBYHIOCAW U U ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 1O 11 & 12 1987 presented Weak Signals RIO Club Toledo Ohio RC Electrics/Kopski Continued page 146 nameplate rating should give both Nominal RPM Maximum RPM values Nominal RPM would armature speed corresponding Nominal Power Nominal Current Nominal Voltage conditions pre viously defined would specific-example value usable motor rpm course Maximum RPM would unloaded no prop armature speed attalned Maxi mum Voltage applied Maximum RPM motor would speed motor could run sustained period time eg 10 minutes physical damage like windings being thrown off vibration induc ing bearing failures rating would operating specification much would quality since motor would normally expected used unloaded However would assure advise modeler limits avoid Summarizing above suggestions Elec tric model motor nameplate might look like SUPER WIS BANG 300 Input Power Nom/Max 300/700 Input Current Nom/Max 18/42 Input Voltage Nom/Max 16/28 RPMNom/Max 9/20 watts amperes volts x 1000 nice thing about voltage current rpm ratings quantities average modeler can easily measure multimeter tach thats needed Thus experimenting prop selection example can safely knowing cell count observing motor current ammeter xposioion innormation available contacting Wayne Veager co-director ticket address shown below ADVANCED TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon US Stamps orders above 5 tickets must contain extra postage Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $400 perday adults $100 per day children 12 under Deadline ticket orders March 31 1987 Ticket sales final non rCfint1ohho After some familiarization motor ratings average modeler could easily confidently optimize power systemcell count cell size operating current prop size total weight etcfor kind flying wants exactly what Ive doing years difference determine motor specifications myselfoften ultimate cost realize may still just lots gibberish readers just like 05 nowadays Ill have follow-up column coverage what ratings mean can easily understood applied un like 05 Sizing motors way would make very easy modelers motor makers kit makers follow same drummer flying field review column has illustrated popular method describing Electric motor size displacement analogy once simple meaningful useful no longer column strongly suggesting new method motor rating adopted standard ized based meaningful measurable parameters detailed example may done has given column strongly encourages industry us under guidelines estab lished maybe tested assured EAA seal approval sorts saying what manufacturer clalms true As serious Electric model consumer Id welcome such nameplate information As serious columnist Id go far put some products test report results just cross-check course finally no serious model motor supplier should find objection such specification stan dardization exactiy above similar orders program will returned near mid-March Tickets also available door COMPETITION CLASS NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models COMPETITION BOAT MILITARY SCALE BOAT HELICOPTER PLEASURE POWER BOAT R/C CAR WORKING VESSEL-UNARMED 154 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACHINECUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $2995 ELECTRA L ITE-ICARUSPANTERAMETEORELECTRICUSWHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 Thus model motors domestic imported could classified using competition brought about such truth labels would benefit us know business making motorslacking other standardthis way Id characterize specify product Id go great length explain potential customers what stuff means use Just think nice would buy kit 100-watt-class motor rather kit 05 motorfor sald earlier Huh Whats 05 Which 05 new unbelievable motor columnist has obtained exclusive information about new motor currently under speculative development Usually-reliable sources have provided photo herein showing some aspects ofthis motor motor claimed unprecedented size power modeling applications incorporate ultra-high-technology including exclusively-developed unipolar electro magnetic principle allows motor run brush However exciting aspect new product its application very rare field magnet material rare earth substance known Unobtalniumclaimed 37 times powerful best cobalt material 4 weight No information available time except motor expected available April 11988 So much another month Please forward comment question SASE please author Bob Kopski 25 West End Dr Lansdale PA 19446 PS current winter project Davey Systems Caliph Photos comments later column Also workshow easily modify new Astro DC DC Super Charger make constant-current charger will remove need frequently readjust con trol knob will allow use car engine running RC Giant Scale/de Vries Continued page 49 Dick Phillips publishing company ViP Aero Publishers Inc PO Box 16103 Color ado Springs CO 80935 latest second book interest U U U U U U U U U I U U U U mu EE__EU_EU U.U SIG QUALITY FUELS * Special Igniters improve cold starting idle characteristics U * High Film Strength Additives increase lubricity provide maximum lean run protection Special Detergents help prevent varnish promote clean burning Rust Preventatives protect expensive engines corrosion * * SIG CHAMPION 2-STROKE FUEL FREIGHT FREE SHIPPING ON ORDERS OVER $1500COLLECT PINT QUART GALLON 55 GAL DRUM 0%Nitnutethane$31$450$1050$19000 5%Nitromethane$35$$25$1250$25800 10%Nitroyyttttane$445$550$14 50$32500 15%Nitromtharte$4$2$1650$38500 25%Nitromethane$495$750S209S$52000 35%Nitromethane$51t 75$249$$66000 SIGPREMIUM4-STROKE FUEL 10%Nitromethane$415$5 50$13 95$29500 15%Nitromethane$425$625$15 95$35900 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending fuel finest quality ingredients available alcohol 995% pure very best grade available nitromethafle use 100 o pure get honest portion based % volume maximum lubrication get perfect 50/50 blend Bakers AA Castor Oil Klotz Techniplate Racing Oil protect expensive engines finest quality fuel can made price Dont take word try some judge yourselfi See dealer first available order direct Call 800-247-5008 toll free orders Latest Catalog $300 __ SIG MANUFACTURING CO Montezuma IA 50171 Prices Sobiect chanee notice Giant Scalers power birds Quadra engines other gas-powered engines similar type Dario Brisighella Mr Quadra author Firewall Forward Quadra Bible Having run text book through old word-processor 20 times down-loaded typesetter having proofread another 10 times think Im safe saying anything want know about care feeding operation maintenance Quadra series engines book expertise youll gain reading will stand good stead operate converted chain-saw leaf-blower other small industrial engines Giant happy event want own copy fully-illustrated book its color cover can order directly us $1295 plus U U U U U U U U p p I I U I U $150 postage handling may obtained also RCM Zenith Aviation Books model dealers patronize Ace K/C Royal Products Dab operates US Quadra 1032 E Manitowoc Oak Creek WI 53154 has book sale might cajoled providing autographed copy Good book says immodestly Plans going forward 1987 version IMAAs Flying Festival Itll much earlier past June 11-14to avoid heat humidity experienced inprevious Festivals 1987 location will absolutely boggle mind Its Converse IN former military auxiliary airfield provides 55 solid acres paved surface Jerry Smith IMAAs official photo PRODUCTS FOR PAIJIU MODELER Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems UnsurpesJ April1987 155 HIGH PERFORMANCE FLAP h1ZI~ m 0 GOt S,bonS FASTER & SAFER ziIIIJ S z Sii0a St rOaR S L Rh t gOt iZZI Siow tot hot pianos doolia tandina peed 5a0itioytO patOmCOOS Use cieci SCiipiSflOO-CctioCtOO Sty tt,oitieonyott switCh 80001 Folly adjuotebie iii aittori easy notaliatlon Onadyburit Cowan corn otete nsiruotioos 5550 i2eOrpicei sand FREE Broctiota Deal moo,, noted xeda/uaIte 9aa Ion1wI 2615 Montana Lawrence Ks 66044
Edition: Model Aviation - 1987/04
Page Numbers: 46, 47, 146, 147, 154, 155
Radio Control E lectrics Bob Kopski BEGINNERS Based incoming mail Elec tric enjoying strong steady growth new participants joining get lots mail substantial portion modelers new Electric folks usually have beginner questions such Im continually reminded need keep substantial percentage column allocated covering need personally know very easy experi enced modelers take some basic things granted may major impasses first-time Electric modelers some example sub jects Batteries Ive said before continues true batteries related matters continue bring questions some infor mation common points confusion photos shows variety nickelcadmium cells types used RC system packs and/or Electric power systems photo clearly shows variety physical sizes have time another used sizes table below lists some particulars cells can easily see photo table what would expect higher cell capacity ampere-hours Ah larger heavier cell Simple say Yes necessarily first-time Electric modelers may have some advice local expert about5002300811 some magic cell ighs half much6002680945 runs longer Well far know there8003351182 no such magic cells ampere-9503991407 hours capacity cell has larger is12005081792 physically heavier thats 46 Model Aviation Cell Capacity CellWeight Nominal mAhgramsounces 70560198 100740261 2751350476 Exclusive photo some aspects forthcoming new unbelievable motor Unipolar design requires brushhere connected power wire Sermos 600-amp connector little prop isa standard B x 3 shown comparison supersecret field magnets made rare-earth Unobtainium allowed photographed Avarletyof Ni-Cd ceils ranging capacityfrom 70 mAh L 1200 mAh R Celivolume weight closely proportional capacitybut have same nominal terminal voltage 12 volts isa function cell chemistry cell size Author Kopski addresses topic months column table can provide some interesting insight example drew plot showing cell weight nominal capacity grid paper guess what Its essentially straight line What means cell weight cell capacity essentially linearly related want double motor run time other things being constant must essentially double bat tery capacityand weight dont let anyone L array so-called 05 motors ones shown have power-handling capacity ranging about 80 watts over 150 watts Gear belt speed-reducers change basic capability motor So lust what 05 second photo R further Illustrates confusion over motor size motors include so-called OSs 075s 1 Os 15s 25s1 Most labeled Lack motorspecification standards make very difficult know whats what what once youve got Author Bob Kopskl proclaims Electric has matured point meaningful standards necessary tell different Incidentally nominal capacity table above advertised label value cells shown Nickel-cadmium Ni-Cd cellsno matter what sizehave same terminal voltage cell see photo has same voltage output nominal loads Thus both tiny 70 mAli milliampere-hour cell familiar 12 Ah 1200 milliampere-hour cell have same nominal 12 volts output However under very heavy current loads such required motors actual cell voltage decreases somewhat due losses internal cell resistance voltage depression gener ally greater smaller cells battery group cells connected gether hobby almost always series connection means cells wired end-to-end battery voltage total sum cell voltages Thus fourcell battery has terminal voltage 4 x 12 48 volts very important cells ins battery same capacity size Thus always uses example 12 Ah cells same batteryor 800 mAh cells same battery never mixes other sizes Battery charging current always deter mined cell size independent number cells Thus like charge empty 12 Ah packs 42 amps 15 minutes no matter cells pack So summary Ni-Cd cells available wide variety sizes capacities expressed ampere-hours cell volume weight essentially directly proportional capacity such cells have same nominal terminal voltage 12 volts battery composed cell cells must same size Finally battery charge current related cell size number cells Additional in-depth discussions other battery topics can found inthe December 1983 issue Model Aviation Electric supplies Charles Sylvia Middleboro MA has gradually building Electric related supplies business offers reliable mail order service attractive pricing Charlie has catalog wares normally costs some coins Charlie making special offer readers column can get new catalog free simply telling Charlie read about column always knew valuable column Send letter CS Flight Systems 31 Perry St Box 775 Middieboro MA 02346 telephone number 617 947-2805 Motor size continuing trouble-spot rapidly-growing area Electric always question motor size related question What motor goes what plane beginning early Seventies long ago far away very dawn serious Electric interest country simple size descrip tion Electric motors put place simply describe motors terms familiar gas engines Thus now-commonplace 05 Electric taken mean motor would turn same prop fly same plane everyday sport 049 glow engineexcept weight considerations course Electric has come long way since early Seventies original size designation scheme has continued place However what Continued page 146 1 WHY VIETNAM Color black awl white 60 minutes VHSB TARGET FOR TODAY Black white 60 minutes VHS Official US policy involvement Vietnam recounts Made under operational conditions members combat victorious banle ot KHE-SHANcamera units United Kingdom 1943 2THE MEMPHIS BELLE Color 43 minutes VHSB FIGHTER BOMBERS Color 70 minutes VHS Takes actual combat mission deep Germany sequences far some ot spectacular ever EXCITINGfilmed ot war 1mm air 3 THE TRUE GLORY Black white 85 minutes VHS Normandy landing Germanys sarrendw 4 WAR IN THE PACIFIC Black wEte 60 minutes VHS Pearl Harbor New Guinea invasion otthe Phillippines 5 NUREMBERG TRIALS Black wllte 76 minutes VHS Much footage confiscated private Ibraries ot high Nazi officiulo S HISTORY OFTHE KOREAN WAR Biockand white 60 minutes VHS detinifive bivody record Koreas savage contlict immor talized combat cameramen 7 THIS IS GERMANY Black whife60 minutes VHS unhistorical documentota time after madness overcame mankind Postage paid US Canada/Foreign orders add $500 Fin res add 5 percent Sales tax accept Mastercard Visa American Express MD COD Include No Exp date 10 FLAK JUGS AND COBRAS Black white 96 minutes VHS Flak avoidance iv B-f flying P-47 Thunderbolt P-39 Air Cobra 11 NAZI CONCENTRATION CAMPS Black Whde 60 minutes VHS Irrefutable testimony lesson world must never forgetl 12-15 THE AIR FORCE STORY Vat weeg I-IV Black White t20 minutes VHS Over seven hours aerial combat tour videocassenes Wright Brothers dogfights Migs Send COMMAND POST VIDEO PO Box 1500 Crestview FIn 32538 April 1987 47 * Better quality tapes selling for2 3 times much * rAIIJI makers EWWW HEAD LOCK 1-IEADLITE MODEL PRODUCTS CORP PO BOX 100 ALLAMUCHY NEW JERSEY 07820 following formula Load spring rate 0000d4 S D3 N terms have following meanings 11500000 torsional modulus elasticity music wire small d wire diameter large D springs mean diameter its outside diameter minus wire diameter N number active turns including closewound turns spring ends 8 constant formula gives us pounds per inch deflec tion beginning springs free length Adjust free length during winding space between coils keeping mind must fit within strut find load point springs deflection multiply rate determined means formula hy deflection decimal inches get load initial final positions landing-gear travel Remember spring already partially loaded re hound spring used landing gear full size practice Typically airplane weighing 12 lb spring wound 055-in-diameter wire outside diameter 406 having 22 active turns could installed within 500-in GD strut 12 lb distributed six lb leg main gear will produce deflection model rest about 4 dimension somewhat reduced because part models weight supported nose gear tail wheel hut reality ahsorbing landing shocks main gear Wound free length 262 such spring could deflect total 125 absorh landing load 17 lb legor roughly three times models weight spring GD 406 055-in -diameter wire will have inside diame ter 296 Because tendency increase diameter after winding spring wound 25-in-diameter mandrel length wire turn 11 22 turns plus two inactive turns end length wire needed shout 29 Add several inches gripping plier 36-in hohhy shop length wire sufficient spring As indication amount spring-hack wire after winding changing mandrel diameter 28 yields spring GD 43 Bob Dolly Wischer S-221 Lap/tam Peak Rd Delafleld WI 53018 RC Electrics/Kopski Continued page 47 once convenient meaningful way describe motor size early days now m view no longer good approach two ways can illustrated first commercially-made Electric system 05 motor eight 055 Ah 550 mAh cells Astro system gave years service fact still have well-worn motor recall measwing system perform ance specified prop operating power level just about 75 80 watts mind number stock 05 power Now understand new Astro cobalt 02 can operate about same power level Another way see such size ratings dubious value realize contemporary cobalt 05 fully capable handling over twice power first 05 system beyond new Astro FM cobalt 05 goes much farther regard Yet three motors about same physical size weight called OSs So real 05 Considering power-handling abilities Ive just described directly affect well such motors can fly given plane its no wonder would-be Electric fliers experienced ones well get confused Incidentally please note nowhere above did say mentioned motors has less power otherfor motors have power Rather motors have lack ability handle varying power levels Anyway seems clear enough 05 other such designation doesnt mean much anymore So think its time change Ithink its time appropriately describe standardize what meant motor size think modeling industry modeling consumer need standard makes sense wont become outdated changes technology new entries model motor field opinion Electric Aeromodeling Association EAA best-positioned group establish control matter think because EAA official Special Interest Group Electric designated AMA also think its right group because left itself bickering industry will never come up standards Finally Ithink time now Quite naturally Ive got some ideas own subject since Ive just opened up topical area am now going pass along Rememberyou read first Model Avia lion 146 Model Aviation 1 STAIM.ESS STEEL HEAD LOCK glow plug connector strength & long corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOIIATIC ON/OFF SWITCH prevent short circuits pocket tool box 4Charger LED INDICATOR available What motor size should First believe Electric motor size should refer way gas engine size Second believe motor size should no way related indicative physical motor dimensions characteristics material makeup Third believe size should no way tied specific battery description per Se What motor size should believe Elec tric model motor size should described such ways modelers can easily relate motors manufacture other model size requirements believe Electric model motor size should specified described just like motors other application arein elec trical power terms two basic thoughts completely consistent other understand what mean take look around house Look vacuum cleaner weed trimmer fan air conditioner electric drill different applica tions electric motors Yet have nameplates describe motor capability various combinations suitable terms including voltage current horsepower rpm etc Taking long-established standard ap proach adapting modeling use herein suggest describing model motors follows FirstPower Rating tells big motor Model motor nameplates should specify both Nominal Power Maximum Power Nominal Power would highest oper ating input power manufacturer would assure motor would operate continu ously failure-free some minimum EAA standardized time perhaps 100 hours would highest power average modeler would routinely use perfectly satisfactory flying fun would power used adver tise describe motor eg 200watt motor Maximum Power would some much higher power level motor might safely operated intermittently much shorter EAA-standardized time perhaps minute followed cool-down two ratings would describe given motor both sport competitive applica tions same time give meaningful useful guide what model size motor suited would much appropriate way presently-used displace ment analogy SecondCurrent Rating input amperes motor nameplate should specify both Nominal Current Maximum Current Nominal Current would highest input current continuous operating duty would current Nominal Power has specified Maximum Current would highest input current could safely tolerated short intermittent runs eg minute ThirdVoltage Rating cells motor nameplate should give both Nominal Voltage Maximum Voltage ratings Nominal Voltage would voltage along Nominal Current value would needed attain Nominal Power Maximum Voltage would highest voltage could applied unloaded no prop motor such resulting rpm would damaging motor factor will discussed next FourthRPM what your tach reads Continued page 154 April 1987 147 woilcfs starter system worlds integrated system starter parts starts accessories gets off superior start Hi-Tork Dynatron Hi-Tork Starter worlds powerful standard starler Hi-Tork features several innova tive safety features including patented hand guard keep hands away propeller starter switch located below handgrip help prevent accidental starts heavy-duty Dynatron Starter delivers one-third maximum power 12 volts closest competitor 47-69% torque standard 12volt starters greater output Dynatron can used 24 volts Equipped patented safety guard Dynatron backed frill two-year warranty against manufacturing defects Both outstanding starters made USA compatible other Sullivan products exemplify dedication high quality technol ogy Youll find Sullivan starters accessories dealer near Get off safe trouble-free start time Sullivan Determined leading independent testing laboratory 77FFMfR 706VR JPDUC no fly near overhead etectrcpower nes OorNohHavei5 ec PO Box5 66Ba oio MD2 224 30 732 3500 14Ye4//D RADIO CONTROL P-51 MUSTANG 25 TO 45 ENGINES WING SPAN 55 2995 THIS IS THE SIXTH RELEASE OF OUR INCREASINGLY POPULAR EASY-BUILD SHORT KITS THE REALISTIC LOOKING MUSTANG FLIES LIKE DREAM WITH FLENTY OF WING AND TAIL AREA FOR FULL-RANGE FOSITIVE CONTROL AS WITH ALL OUR SHORT-KITS THE MUSTANG IS DESIGNED AROUND FOAM WING AND BOX FRAME FUSELAGE FOR SIMPLE AND STURDY CONSTRUCTION WE FURNISH THE ESSENTIAL PARTS ALONG WITH EASY-TO-FOLLOW PLANS AND LET THE BUILDER SELECT HIS OWN WOOD AND ADDITIONAL HARD WARE SHORT KIT INCLUDES PRECISION CUT ARCOFOAM WING CORES ABS HIGH-IMPACT COWLING AND BELLY COOLER FORMED WING GUN PORTS AND EXHAUST CRYSTAL CLEAR CANOPY WITH FRAMEWORK PLYWOOD FIREWALL LANDING GEAR STRAPS BLOCKS AND SCREWS FORMED STEEL ENGINE MOUNT CONTROL SURFACE HINGES CLEAR PLANS WITH CONSTRUCTION DETAILS AND ALL NECESSARY TEMPLATES o BILL OF MATERIALS NO BALSA INCLUGEDI ORDERING SEND CHECK OR MONEY ORDER FOR 2930 PLUS i430 POSTAGE CANADIANS ADD 6501 TO WING MFG PO BOX 33 CRYSTAL LAKE IL 30014 ILLINOIS RESIDENTS ADD t// SALES TAX ALL ORDERS MUST BE IN US FUNOS SEND 350 FOR PRODUCT CATALOG DESCRIBING OUR COMPLETE LINE OP FOAM CORE REPLACEMENT WINGS ACCESSORIES KITS TOOLS AND MUCH MORE CATALOG FREE WITH ORDER c PHONE vi 815-459-0417 Matched PerTormance TOP PERFORMA K&R ENGINES ApIaneMarine K&B FUELSK&B GLOW PLUGS 9 Blends4 Choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B MicroBalloons FILLER K&B SUPER FOXY RESIN K&B SUPER POXY THINNER K&R SUPER POXY PRIMER K&B SUPER FOXY PAINT K&B MIXING CUPS K7s4E HO BRYN TOE AWAYHO SB OIIIDE AWAYHn RBYH TOE AWAYNO BBYHT DC AWAY 22 long 9sipuo CONCORDE Slingshot glider kit PP FAMOUS BRITISH DIESELS ALOG-DIESEL HANDBOOK pp HOBBY HIDEWAYDELAVANIL 244-7389 61734 HOBBYHOEnWAYHORBYHIOEAWAVHOBBYHISEAWaY9IOBBYHIOCAW U U ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 1O 11 & 12 1987 presented Weak Signals RIO Club Toledo Ohio RC Electrics/Kopski Continued page 146 nameplate rating should give both Nominal RPM Maximum RPM values Nominal RPM would armature speed corresponding Nominal Power Nominal Current Nominal Voltage conditions pre viously defined would specific-example value usable motor rpm course Maximum RPM would unloaded no prop armature speed attalned Maxi mum Voltage applied Maximum RPM motor would speed motor could run sustained period time eg 10 minutes physical damage like windings being thrown off vibration induc ing bearing failures rating would operating specification much would quality since motor would normally expected used unloaded However would assure advise modeler limits avoid Summarizing above suggestions Elec tric model motor nameplate might look like SUPER WIS BANG 300 Input Power Nom/Max 300/700 Input Current Nom/Max 18/42 Input Voltage Nom/Max 16/28 RPMNom/Max 9/20 watts amperes volts x 1000 nice thing about voltage current rpm ratings quantities average modeler can easily measure multimeter tach thats needed Thus experimenting prop selection example can safely knowing cell count observing motor current ammeter xposioion innormation available contacting Wayne Veager co-director ticket address shown below ADVANCED TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon US Stamps orders above 5 tickets must contain extra postage Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $400 perday adults $100 per day children 12 under Deadline ticket orders March 31 1987 Ticket sales final non rCfint1ohho After some familiarization motor ratings average modeler could easily confidently optimize power systemcell count cell size operating current prop size total weight etcfor kind flying wants exactly what Ive doing years difference determine motor specifications myselfoften ultimate cost realize may still just lots gibberish readers just like 05 nowadays Ill have follow-up column coverage what ratings mean can easily understood applied un like 05 Sizing motors way would make very easy modelers motor makers kit makers follow same drummer flying field review column has illustrated popular method describing Electric motor size displacement analogy once simple meaningful useful no longer column strongly suggesting new method motor rating adopted standard ized based meaningful measurable parameters detailed example may done has given column strongly encourages industry us under guidelines estab lished maybe tested assured EAA seal approval sorts saying what manufacturer clalms true As serious Electric model consumer Id welcome such nameplate information As serious columnist Id go far put some products test report results just cross-check course finally no serious model motor supplier should find objection such specification stan dardization exactiy above similar orders program will returned near mid-March Tickets also available door COMPETITION CLASS NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models COMPETITION BOAT MILITARY SCALE BOAT HELICOPTER PLEASURE POWER BOAT R/C CAR WORKING VESSEL-UNARMED 154 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACHINECUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $2995 ELECTRA L ITE-ICARUSPANTERAMETEORELECTRICUSWHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 Thus model motors domestic imported could classified using competition brought about such truth labels would benefit us know business making motorslacking other standardthis way Id characterize specify product Id go great length explain potential customers what stuff means use Just think nice would buy kit 100-watt-class motor rather kit 05 motorfor sald earlier Huh Whats 05 Which 05 new unbelievable motor columnist has obtained exclusive information about new motor currently under speculative development Usually-reliable sources have provided photo herein showing some aspects ofthis motor motor claimed unprecedented size power modeling applications incorporate ultra-high-technology including exclusively-developed unipolar electro magnetic principle allows motor run brush However exciting aspect new product its application very rare field magnet material rare earth substance known Unobtalniumclaimed 37 times powerful best cobalt material 4 weight No information available time except motor expected available April 11988 So much another month Please forward comment question SASE please author Bob Kopski 25 West End Dr Lansdale PA 19446 PS current winter project Davey Systems Caliph Photos comments later column Also workshow easily modify new Astro DC DC Super Charger make constant-current charger will remove need frequently readjust con trol knob will allow use car engine running RC Giant Scale/de Vries Continued page 49 Dick Phillips publishing company ViP Aero Publishers Inc PO Box 16103 Color ado Springs CO 80935 latest second book interest U U U U U U U U U I U U U U mu EE__EU_EU U.U SIG QUALITY FUELS * Special Igniters improve cold starting idle characteristics U * High Film Strength Additives increase lubricity provide maximum lean run protection Special Detergents help prevent varnish promote clean burning Rust Preventatives protect expensive engines corrosion * * SIG CHAMPION 2-STROKE FUEL FREIGHT FREE SHIPPING ON ORDERS OVER $1500COLLECT PINT QUART GALLON 55 GAL DRUM 0%Nitnutethane$31$450$1050$19000 5%Nitromethane$35$$25$1250$25800 10%Nitroyyttttane$445$550$14 50$32500 15%Nitromtharte$4$2$1650$38500 25%Nitromethane$495$750S209S$52000 35%Nitromethane$51t 75$249$$66000 SIGPREMIUM4-STROKE FUEL 10%Nitromethane$415$5 50$13 95$29500 15%Nitromethane$425$625$15 95$35900 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending fuel finest quality ingredients available alcohol 995% pure very best grade available nitromethafle use 100 o pure get honest portion based % volume maximum lubrication get perfect 50/50 blend Bakers AA Castor Oil Klotz Techniplate Racing Oil protect expensive engines finest quality fuel can made price Dont take word try some judge yourselfi See dealer first available order direct Call 800-247-5008 toll free orders Latest Catalog $300 __ SIG MANUFACTURING CO Montezuma IA 50171 Prices Sobiect chanee notice Giant Scalers power birds Quadra engines other gas-powered engines similar type Dario Brisighella Mr Quadra author Firewall Forward Quadra Bible Having run text book through old word-processor 20 times down-loaded typesetter having proofread another 10 times think Im safe saying anything want know about care feeding operation maintenance Quadra series engines book expertise youll gain reading will stand good stead operate converted chain-saw leaf-blower other small industrial engines Giant happy event want own copy fully-illustrated book its color cover can order directly us $1295 plus U U U U U U U U p p I I U I U $150 postage handling may obtained also RCM Zenith Aviation Books model dealers patronize Ace K/C Royal Products Dab operates US Quadra 1032 E Manitowoc Oak Creek WI 53154 has book sale might cajoled providing autographed copy Good book says immodestly Plans going forward 1987 version IMAAs Flying Festival Itll much earlier past June 11-14to avoid heat humidity experienced inprevious Festivals 1987 location will absolutely boggle mind Its Converse IN former military auxiliary airfield provides 55 solid acres paved surface Jerry Smith IMAAs official photo PRODUCTS FOR PAIJIU MODELER Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems UnsurpesJ April1987 155 HIGH PERFORMANCE FLAP h1ZI~ m 0 GOt S,bonS FASTER & SAFER ziIIIJ S z Sii0a St rOaR S L Rh t gOt iZZI Siow tot hot pianos doolia tandina peed 5a0itioytO patOmCOOS Use cieci SCiipiSflOO-CctioCtOO Sty tt,oitieonyott switCh 80001 Folly adjuotebie iii aittori easy notaliatlon Onadyburit Cowan corn otete nsiruotioos 5550 i2eOrpicei sand FREE Broctiota Deal moo,, noted xeda/uaIte 9aa Ion1wI 2615 Montana Lawrence Ks 66044
Edition: Model Aviation - 1987/04
Page Numbers: 46, 47, 146, 147, 154, 155
Radio Control E lectrics Bob Kopski BEGINNERS Based incoming mail Elec tric enjoying strong steady growth new participants joining get lots mail substantial portion modelers new Electric folks usually have beginner questions such Im continually reminded need keep substantial percentage column allocated covering need personally know very easy experi enced modelers take some basic things granted may major impasses first-time Electric modelers some example sub jects Batteries Ive said before continues true batteries related matters continue bring questions some infor mation common points confusion photos shows variety nickelcadmium cells types used RC system packs and/or Electric power systems photo clearly shows variety physical sizes have time another used sizes table below lists some particulars cells can easily see photo table what would expect higher cell capacity ampere-hours Ah larger heavier cell Simple say Yes necessarily first-time Electric modelers may have some advice local expert about5002300811 some magic cell ighs half much6002680945 runs longer Well far know there8003351182 no such magic cells ampere-9503991407 hours capacity cell has larger is12005081792 physically heavier thats 46 Model Aviation Cell Capacity CellWeight Nominal mAhgramsounces 70560198 100740261 2751350476 Exclusive photo some aspects forthcoming new unbelievable motor Unipolar design requires brushhere connected power wire Sermos 600-amp connector little prop isa standard B x 3 shown comparison supersecret field magnets made rare-earth Unobtainium allowed photographed Avarletyof Ni-Cd ceils ranging capacityfrom 70 mAh L 1200 mAh R Celivolume weight closely proportional capacitybut have same nominal terminal voltage 12 volts isa function cell chemistry cell size Author Kopski addresses topic months column table can provide some interesting insight example drew plot showing cell weight nominal capacity grid paper guess what Its essentially straight line What means cell weight cell capacity essentially linearly related want double motor run time other things being constant must essentially double bat tery capacityand weight dont let anyone L array so-called 05 motors ones shown have power-handling capacity ranging about 80 watts over 150 watts Gear belt speed-reducers change basic capability motor So lust what 05 second photo R further Illustrates confusion over motor size motors include so-called OSs 075s 1 Os 15s 25s1 Most labeled Lack motorspecification standards make very difficult know whats what what once youve got Author Bob Kopskl proclaims Electric has matured point meaningful standards necessary tell different Incidentally nominal capacity table above advertised label value cells shown Nickel-cadmium Ni-Cd cellsno matter what sizehave same terminal voltage cell see photo has same voltage output nominal loads Thus both tiny 70 mAli milliampere-hour cell familiar 12 Ah 1200 milliampere-hour cell have same nominal 12 volts output However under very heavy current loads such required motors actual cell voltage decreases somewhat due losses internal cell resistance voltage depression gener ally greater smaller cells battery group cells connected gether hobby almost always series connection means cells wired end-to-end battery voltage total sum cell voltages Thus fourcell battery has terminal voltage 4 x 12 48 volts very important cells ins battery same capacity size Thus always uses example 12 Ah cells same batteryor 800 mAh cells same battery never mixes other sizes Battery charging current always deter mined cell size independent number cells Thus like charge empty 12 Ah packs 42 amps 15 minutes no matter cells pack So summary Ni-Cd cells available wide variety sizes capacities expressed ampere-hours cell volume weight essentially directly proportional capacity such cells have same nominal terminal voltage 12 volts battery composed cell cells must same size Finally battery charge current related cell size number cells Additional in-depth discussions other battery topics can found inthe December 1983 issue Model Aviation Electric supplies Charles Sylvia Middleboro MA has gradually building Electric related supplies business offers reliable mail order service attractive pricing Charlie has catalog wares normally costs some coins Charlie making special offer readers column can get new catalog free simply telling Charlie read about column always knew valuable column Send letter CS Flight Systems 31 Perry St Box 775 Middieboro MA 02346 telephone number 617 947-2805 Motor size continuing trouble-spot rapidly-growing area Electric always question motor size related question What motor goes what plane beginning early Seventies long ago far away very dawn serious Electric interest country simple size descrip tion Electric motors put place simply describe motors terms familiar gas engines Thus now-commonplace 05 Electric taken mean motor would turn same prop fly same plane everyday sport 049 glow engineexcept weight considerations course Electric has come long way since early Seventies original size designation scheme has continued place However what Continued page 146 1 WHY VIETNAM Color black awl white 60 minutes VHSB TARGET FOR TODAY Black white 60 minutes VHS Official US policy involvement Vietnam recounts Made under operational conditions members combat victorious banle ot KHE-SHANcamera units United Kingdom 1943 2THE MEMPHIS BELLE Color 43 minutes VHSB FIGHTER BOMBERS Color 70 minutes VHS Takes actual combat mission deep Germany sequences far some ot spectacular ever EXCITINGfilmed ot war 1mm air 3 THE TRUE GLORY Black white 85 minutes VHS Normandy landing Germanys sarrendw 4 WAR IN THE PACIFIC Black wEte 60 minutes VHS Pearl Harbor New Guinea invasion otthe Phillippines 5 NUREMBERG TRIALS Black wllte 76 minutes VHS Much footage confiscated private Ibraries ot high Nazi officiulo S HISTORY OFTHE KOREAN WAR Biockand white 60 minutes VHS detinifive bivody record Koreas savage contlict immor talized combat cameramen 7 THIS IS GERMANY Black whife60 minutes VHS unhistorical documentota time after madness overcame mankind Postage paid US Canada/Foreign orders add $500 Fin res add 5 percent Sales tax accept Mastercard Visa American Express MD COD Include No Exp date 10 FLAK JUGS AND COBRAS Black white 96 minutes VHS Flak avoidance iv B-f flying P-47 Thunderbolt P-39 Air Cobra 11 NAZI CONCENTRATION CAMPS Black Whde 60 minutes VHS Irrefutable testimony lesson world must never forgetl 12-15 THE AIR FORCE STORY Vat weeg I-IV Black White t20 minutes VHS Over seven hours aerial combat tour videocassenes Wright Brothers dogfights Migs Send COMMAND POST VIDEO PO Box 1500 Crestview FIn 32538 April 1987 47 * Better quality tapes selling for2 3 times much * rAIIJI makers EWWW HEAD LOCK 1-IEADLITE MODEL PRODUCTS CORP PO BOX 100 ALLAMUCHY NEW JERSEY 07820 following formula Load spring rate 0000d4 S D3 N terms have following meanings 11500000 torsional modulus elasticity music wire small d wire diameter large D springs mean diameter its outside diameter minus wire diameter N number active turns including closewound turns spring ends 8 constant formula gives us pounds per inch deflec tion beginning springs free length Adjust free length during winding space between coils keeping mind must fit within strut find load point springs deflection multiply rate determined means formula hy deflection decimal inches get load initial final positions landing-gear travel Remember spring already partially loaded re hound spring used landing gear full size practice Typically airplane weighing 12 lb spring wound 055-in-diameter wire outside diameter 406 having 22 active turns could installed within 500-in GD strut 12 lb distributed six lb leg main gear will produce deflection model rest about 4 dimension somewhat reduced because part models weight supported nose gear tail wheel hut reality ahsorbing landing shocks main gear Wound free length 262 such spring could deflect total 125 absorh landing load 17 lb legor roughly three times models weight spring GD 406 055-in -diameter wire will have inside diame ter 296 Because tendency increase diameter after winding spring wound 25-in-diameter mandrel length wire turn 11 22 turns plus two inactive turns end length wire needed shout 29 Add several inches gripping plier 36-in hohhy shop length wire sufficient spring As indication amount spring-hack wire after winding changing mandrel diameter 28 yields spring GD 43 Bob Dolly Wischer S-221 Lap/tam Peak Rd Delafleld WI 53018 RC Electrics/Kopski Continued page 47 once convenient meaningful way describe motor size early days now m view no longer good approach two ways can illustrated first commercially-made Electric system 05 motor eight 055 Ah 550 mAh cells Astro system gave years service fact still have well-worn motor recall measwing system perform ance specified prop operating power level just about 75 80 watts mind number stock 05 power Now understand new Astro cobalt 02 can operate about same power level Another way see such size ratings dubious value realize contemporary cobalt 05 fully capable handling over twice power first 05 system beyond new Astro FM cobalt 05 goes much farther regard Yet three motors about same physical size weight called OSs So real 05 Considering power-handling abilities Ive just described directly affect well such motors can fly given plane its no wonder would-be Electric fliers experienced ones well get confused Incidentally please note nowhere above did say mentioned motors has less power otherfor motors have power Rather motors have lack ability handle varying power levels Anyway seems clear enough 05 other such designation doesnt mean much anymore So think its time change Ithink its time appropriately describe standardize what meant motor size think modeling industry modeling consumer need standard makes sense wont become outdated changes technology new entries model motor field opinion Electric Aeromodeling Association EAA best-positioned group establish control matter think because EAA official Special Interest Group Electric designated AMA also think its right group because left itself bickering industry will never come up standards Finally Ithink time now Quite naturally Ive got some ideas own subject since Ive just opened up topical area am now going pass along Rememberyou read first Model Avia lion 146 Model Aviation 1 STAIM.ESS STEEL HEAD LOCK glow plug connector strength & long corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOIIATIC ON/OFF SWITCH prevent short circuits pocket tool box 4Charger LED INDICATOR available What motor size should First believe Electric motor size should refer way gas engine size Second believe motor size should no way related indicative physical motor dimensions characteristics material makeup Third believe size should no way tied specific battery description per Se What motor size should believe Elec tric model motor size should described such ways modelers can easily relate motors manufacture other model size requirements believe Electric model motor size should specified described just like motors other application arein elec trical power terms two basic thoughts completely consistent other understand what mean take look around house Look vacuum cleaner weed trimmer fan air conditioner electric drill different applica tions electric motors Yet have nameplates describe motor capability various combinations suitable terms including voltage current horsepower rpm etc Taking long-established standard ap proach adapting modeling use herein suggest describing model motors follows FirstPower Rating tells big motor Model motor nameplates should specify both Nominal Power Maximum Power Nominal Power would highest oper ating input power manufacturer would assure motor would operate continu ously failure-free some minimum EAA standardized time perhaps 100 hours would highest power average modeler would routinely use perfectly satisfactory flying fun would power used adver tise describe motor eg 200watt motor Maximum Power would some much higher power level motor might safely operated intermittently much shorter EAA-standardized time perhaps minute followed cool-down two ratings would describe given motor both sport competitive applica tions same time give meaningful useful guide what model size motor suited would much appropriate way presently-used displace ment analogy SecondCurrent Rating input amperes motor nameplate should specify both Nominal Current Maximum Current Nominal Current would highest input current continuous operating duty would current Nominal Power has specified Maximum Current would highest input current could safely tolerated short intermittent runs eg minute ThirdVoltage Rating cells motor nameplate should give both Nominal Voltage Maximum Voltage ratings Nominal Voltage would voltage along Nominal Current value would needed attain Nominal Power Maximum Voltage would highest voltage could applied unloaded no prop motor such resulting rpm would damaging motor factor will discussed next FourthRPM what your tach reads Continued page 154 April 1987 147 woilcfs starter system worlds integrated system starter parts starts accessories gets off superior start Hi-Tork Dynatron Hi-Tork Starter worlds powerful standard starler Hi-Tork features several innova tive safety features including patented hand guard keep hands away propeller starter switch located below handgrip help prevent accidental starts heavy-duty Dynatron Starter delivers one-third maximum power 12 volts closest competitor 47-69% torque standard 12volt starters greater output Dynatron can used 24 volts Equipped patented safety guard Dynatron backed frill two-year warranty against manufacturing defects Both outstanding starters made USA compatible other Sullivan products exemplify dedication high quality technol ogy Youll find Sullivan starters accessories dealer near Get off safe trouble-free start time Sullivan Determined leading independent testing laboratory 77FFMfR 706VR JPDUC no fly near overhead etectrcpower nes OorNohHavei5 ec PO Box5 66Ba oio MD2 224 30 732 3500 14Ye4//D RADIO CONTROL P-51 MUSTANG 25 TO 45 ENGINES WING SPAN 55 2995 THIS IS THE SIXTH RELEASE OF OUR INCREASINGLY POPULAR EASY-BUILD SHORT KITS THE REALISTIC LOOKING MUSTANG FLIES LIKE DREAM WITH FLENTY OF WING AND TAIL AREA FOR FULL-RANGE FOSITIVE CONTROL AS WITH ALL OUR SHORT-KITS THE MUSTANG IS DESIGNED AROUND FOAM WING AND BOX FRAME FUSELAGE FOR SIMPLE AND STURDY CONSTRUCTION WE FURNISH THE ESSENTIAL PARTS ALONG WITH EASY-TO-FOLLOW PLANS AND LET THE BUILDER SELECT HIS OWN WOOD AND ADDITIONAL HARD WARE SHORT KIT INCLUDES PRECISION CUT ARCOFOAM WING CORES ABS HIGH-IMPACT COWLING AND BELLY COOLER FORMED WING GUN PORTS AND EXHAUST CRYSTAL CLEAR CANOPY WITH FRAMEWORK PLYWOOD FIREWALL LANDING GEAR STRAPS BLOCKS AND SCREWS FORMED STEEL ENGINE MOUNT CONTROL SURFACE HINGES CLEAR PLANS WITH CONSTRUCTION DETAILS AND ALL NECESSARY TEMPLATES o BILL OF MATERIALS NO BALSA INCLUGEDI ORDERING SEND CHECK OR MONEY ORDER FOR 2930 PLUS i430 POSTAGE CANADIANS ADD 6501 TO WING MFG PO BOX 33 CRYSTAL LAKE IL 30014 ILLINOIS RESIDENTS ADD t// SALES TAX ALL ORDERS MUST BE IN US FUNOS SEND 350 FOR PRODUCT CATALOG DESCRIBING OUR COMPLETE LINE OP FOAM CORE REPLACEMENT WINGS ACCESSORIES KITS TOOLS AND MUCH MORE CATALOG FREE WITH ORDER c PHONE vi 815-459-0417 Matched PerTormance TOP PERFORMA K&R ENGINES ApIaneMarine K&B FUELSK&B GLOW PLUGS 9 Blends4 Choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B MicroBalloons FILLER K&B SUPER FOXY RESIN K&B SUPER POXY THINNER K&R SUPER POXY PRIMER K&B SUPER FOXY PAINT K&B MIXING CUPS K7s4E HO BRYN TOE AWAYHO SB OIIIDE AWAYHn RBYH TOE AWAYNO BBYHT DC AWAY 22 long 9sipuo CONCORDE Slingshot glider kit PP FAMOUS BRITISH DIESELS ALOG-DIESEL HANDBOOK pp HOBBY HIDEWAYDELAVANIL 244-7389 61734 HOBBYHOEnWAYHORBYHIOEAWAVHOBBYHISEAWaY9IOBBYHIOCAW U U ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 1O 11 & 12 1987 presented Weak Signals RIO Club Toledo Ohio RC Electrics/Kopski Continued page 146 nameplate rating should give both Nominal RPM Maximum RPM values Nominal RPM would armature speed corresponding Nominal Power Nominal Current Nominal Voltage conditions pre viously defined would specific-example value usable motor rpm course Maximum RPM would unloaded no prop armature speed attalned Maxi mum Voltage applied Maximum RPM motor would speed motor could run sustained period time eg 10 minutes physical damage like windings being thrown off vibration induc ing bearing failures rating would operating specification much would quality since motor would normally expected used unloaded However would assure advise modeler limits avoid Summarizing above suggestions Elec tric model motor nameplate might look like SUPER WIS BANG 300 Input Power Nom/Max 300/700 Input Current Nom/Max 18/42 Input Voltage Nom/Max 16/28 RPMNom/Max 9/20 watts amperes volts x 1000 nice thing about voltage current rpm ratings quantities average modeler can easily measure multimeter tach thats needed Thus experimenting prop selection example can safely knowing cell count observing motor current ammeter xposioion innormation available contacting Wayne Veager co-director ticket address shown below ADVANCED TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon US Stamps orders above 5 tickets must contain extra postage Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $400 perday adults $100 per day children 12 under Deadline ticket orders March 31 1987 Ticket sales final non rCfint1ohho After some familiarization motor ratings average modeler could easily confidently optimize power systemcell count cell size operating current prop size total weight etcfor kind flying wants exactly what Ive doing years difference determine motor specifications myselfoften ultimate cost realize may still just lots gibberish readers just like 05 nowadays Ill have follow-up column coverage what ratings mean can easily understood applied un like 05 Sizing motors way would make very easy modelers motor makers kit makers follow same drummer flying field review column has illustrated popular method describing Electric motor size displacement analogy once simple meaningful useful no longer column strongly suggesting new method motor rating adopted standard ized based meaningful measurable parameters detailed example may done has given column strongly encourages industry us under guidelines estab lished maybe tested assured EAA seal approval sorts saying what manufacturer clalms true As serious Electric model consumer Id welcome such nameplate information As serious columnist Id go far put some products test report results just cross-check course finally no serious model motor supplier should find objection such specification stan dardization exactiy above similar orders program will returned near mid-March Tickets also available door COMPETITION CLASS NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models COMPETITION BOAT MILITARY SCALE BOAT HELICOPTER PLEASURE POWER BOAT R/C CAR WORKING VESSEL-UNARMED 154 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACHINECUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $2995 ELECTRA L ITE-ICARUSPANTERAMETEORELECTRICUSWHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 Thus model motors domestic imported could classified using competition brought about such truth labels would benefit us know business making motorslacking other standardthis way Id characterize specify product Id go great length explain potential customers what stuff means use Just think nice would buy kit 100-watt-class motor rather kit 05 motorfor sald earlier Huh Whats 05 Which 05 new unbelievable motor columnist has obtained exclusive information about new motor currently under speculative development Usually-reliable sources have provided photo herein showing some aspects ofthis motor motor claimed unprecedented size power modeling applications incorporate ultra-high-technology including exclusively-developed unipolar electro magnetic principle allows motor run brush However exciting aspect new product its application very rare field magnet material rare earth substance known Unobtalniumclaimed 37 times powerful best cobalt material 4 weight No information available time except motor expected available April 11988 So much another month Please forward comment question SASE please author Bob Kopski 25 West End Dr Lansdale PA 19446 PS current winter project Davey Systems Caliph Photos comments later column Also workshow easily modify new Astro DC DC Super Charger make constant-current charger will remove need frequently readjust con trol knob will allow use car engine running RC Giant Scale/de Vries Continued page 49 Dick Phillips publishing company ViP Aero Publishers Inc PO Box 16103 Color ado Springs CO 80935 latest second book interest U U U U U U U U U I U U U U mu EE__EU_EU U.U SIG QUALITY FUELS * Special Igniters improve cold starting idle characteristics U * High Film Strength Additives increase lubricity provide maximum lean run protection Special Detergents help prevent varnish promote clean burning Rust Preventatives protect expensive engines corrosion * * SIG CHAMPION 2-STROKE FUEL FREIGHT FREE SHIPPING ON ORDERS OVER $1500COLLECT PINT QUART GALLON 55 GAL DRUM 0%Nitnutethane$31$450$1050$19000 5%Nitromethane$35$$25$1250$25800 10%Nitroyyttttane$445$550$14 50$32500 15%Nitromtharte$4$2$1650$38500 25%Nitromethane$495$750S209S$52000 35%Nitromethane$51t 75$249$$66000 SIGPREMIUM4-STROKE FUEL 10%Nitromethane$415$5 50$13 95$29500 15%Nitromethane$425$625$15 95$35900 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending fuel finest quality ingredients available alcohol 995% pure very best grade available nitromethafle use 100 o pure get honest portion based % volume maximum lubrication get perfect 50/50 blend Bakers AA Castor Oil Klotz Techniplate Racing Oil protect expensive engines finest quality fuel can made price Dont take word try some judge yourselfi See dealer first available order direct Call 800-247-5008 toll free orders Latest Catalog $300 __ SIG MANUFACTURING CO Montezuma IA 50171 Prices Sobiect chanee notice Giant Scalers power birds Quadra engines other gas-powered engines similar type Dario Brisighella Mr Quadra author Firewall Forward Quadra Bible Having run text book through old word-processor 20 times down-loaded typesetter having proofread another 10 times think Im safe saying anything want know about care feeding operation maintenance Quadra series engines book expertise youll gain reading will stand good stead operate converted chain-saw leaf-blower other small industrial engines Giant happy event want own copy fully-illustrated book its color cover can order directly us $1295 plus U U U U U U U U p p I I U I U $150 postage handling may obtained also RCM Zenith Aviation Books model dealers patronize Ace K/C Royal Products Dab operates US Quadra 1032 E Manitowoc Oak Creek WI 53154 has book sale might cajoled providing autographed copy Good book says immodestly Plans going forward 1987 version IMAAs Flying Festival Itll much earlier past June 11-14to avoid heat humidity experienced inprevious Festivals 1987 location will absolutely boggle mind Its Converse IN former military auxiliary airfield provides 55 solid acres paved surface Jerry Smith IMAAs official photo PRODUCTS FOR PAIJIU MODELER Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems UnsurpesJ April1987 155 HIGH PERFORMANCE FLAP h1ZI~ m 0 GOt S,bonS FASTER & SAFER ziIIIJ S z Sii0a St rOaR S L Rh t gOt iZZI Siow tot hot pianos doolia tandina peed 5a0itioytO patOmCOOS Use cieci SCiipiSflOO-CctioCtOO Sty tt,oitieonyott switCh 80001 Folly adjuotebie iii aittori easy notaliatlon Onadyburit Cowan corn otete nsiruotioos 5550 i2eOrpicei sand FREE Broctiota Deal moo,, noted xeda/uaIte 9aa Ion1wI 2615 Montana Lawrence Ks 66044
Edition: Model Aviation - 1987/04
Page Numbers: 46, 47, 146, 147, 154, 155
Radio Control E lectrics Bob Kopski BEGINNERS Based incoming mail Elec tric enjoying strong steady growth new participants joining get lots mail substantial portion modelers new Electric folks usually have beginner questions such Im continually reminded need keep substantial percentage column allocated covering need personally know very easy experi enced modelers take some basic things granted may major impasses first-time Electric modelers some example sub jects Batteries Ive said before continues true batteries related matters continue bring questions some infor mation common points confusion photos shows variety nickelcadmium cells types used RC system packs and/or Electric power systems photo clearly shows variety physical sizes have time another used sizes table below lists some particulars cells can easily see photo table what would expect higher cell capacity ampere-hours Ah larger heavier cell Simple say Yes necessarily first-time Electric modelers may have some advice local expert about5002300811 some magic cell ighs half much6002680945 runs longer Well far know there8003351182 no such magic cells ampere-9503991407 hours capacity cell has larger is12005081792 physically heavier thats 46 Model Aviation Cell Capacity CellWeight Nominal mAhgramsounces 70560198 100740261 2751350476 Exclusive photo some aspects forthcoming new unbelievable motor Unipolar design requires brushhere connected power wire Sermos 600-amp connector little prop isa standard B x 3 shown comparison supersecret field magnets made rare-earth Unobtainium allowed photographed Avarletyof Ni-Cd ceils ranging capacityfrom 70 mAh L 1200 mAh R Celivolume weight closely proportional capacitybut have same nominal terminal voltage 12 volts isa function cell chemistry cell size Author Kopski addresses topic months column table can provide some interesting insight example drew plot showing cell weight nominal capacity grid paper guess what Its essentially straight line What means cell weight cell capacity essentially linearly related want double motor run time other things being constant must essentially double bat tery capacityand weight dont let anyone L array so-called 05 motors ones shown have power-handling capacity ranging about 80 watts over 150 watts Gear belt speed-reducers change basic capability motor So lust what 05 second photo R further Illustrates confusion over motor size motors include so-called OSs 075s 1 Os 15s 25s1 Most labeled Lack motorspecification standards make very difficult know whats what what once youve got Author Bob Kopskl proclaims Electric has matured point meaningful standards necessary tell different Incidentally nominal capacity table above advertised label value cells shown Nickel-cadmium Ni-Cd cellsno matter what sizehave same terminal voltage cell see photo has same voltage output nominal loads Thus both tiny 70 mAli milliampere-hour cell familiar 12 Ah 1200 milliampere-hour cell have same nominal 12 volts output However under very heavy current loads such required motors actual cell voltage decreases somewhat due losses internal cell resistance voltage depression gener ally greater smaller cells battery group cells connected gether hobby almost always series connection means cells wired end-to-end battery voltage total sum cell voltages Thus fourcell battery has terminal voltage 4 x 12 48 volts very important cells ins battery same capacity size Thus always uses example 12 Ah cells same batteryor 800 mAh cells same battery never mixes other sizes Battery charging current always deter mined cell size independent number cells Thus like charge empty 12 Ah packs 42 amps 15 minutes no matter cells pack So summary Ni-Cd cells available wide variety sizes capacities expressed ampere-hours cell volume weight essentially directly proportional capacity such cells have same nominal terminal voltage 12 volts battery composed cell cells must same size Finally battery charge current related cell size number cells Additional in-depth discussions other battery topics can found inthe December 1983 issue Model Aviation Electric supplies Charles Sylvia Middleboro MA has gradually building Electric related supplies business offers reliable mail order service attractive pricing Charlie has catalog wares normally costs some coins Charlie making special offer readers column can get new catalog free simply telling Charlie read about column always knew valuable column Send letter CS Flight Systems 31 Perry St Box 775 Middieboro MA 02346 telephone number 617 947-2805 Motor size continuing trouble-spot rapidly-growing area Electric always question motor size related question What motor goes what plane beginning early Seventies long ago far away very dawn serious Electric interest country simple size descrip tion Electric motors put place simply describe motors terms familiar gas engines Thus now-commonplace 05 Electric taken mean motor would turn same prop fly same plane everyday sport 049 glow engineexcept weight considerations course Electric has come long way since early Seventies original size designation scheme has continued place However what Continued page 146 1 WHY VIETNAM Color black awl white 60 minutes VHSB TARGET FOR TODAY Black white 60 minutes VHS Official US policy involvement Vietnam recounts Made under operational conditions members combat victorious banle ot KHE-SHANcamera units United Kingdom 1943 2THE MEMPHIS BELLE Color 43 minutes VHSB FIGHTER BOMBERS Color 70 minutes VHS Takes actual combat mission deep Germany sequences far some ot spectacular ever EXCITINGfilmed ot war 1mm air 3 THE TRUE GLORY Black white 85 minutes VHS Normandy landing Germanys sarrendw 4 WAR IN THE PACIFIC Black wEte 60 minutes VHS Pearl Harbor New Guinea invasion otthe Phillippines 5 NUREMBERG TRIALS Black wllte 76 minutes VHS Much footage confiscated private Ibraries ot high Nazi officiulo S HISTORY OFTHE KOREAN WAR Biockand white 60 minutes VHS detinifive bivody record Koreas savage contlict immor talized combat cameramen 7 THIS IS GERMANY Black whife60 minutes VHS unhistorical documentota time after madness overcame mankind Postage paid US Canada/Foreign orders add $500 Fin res add 5 percent Sales tax accept Mastercard Visa American Express MD COD Include No Exp date 10 FLAK JUGS AND COBRAS Black white 96 minutes VHS Flak avoidance iv B-f flying P-47 Thunderbolt P-39 Air Cobra 11 NAZI CONCENTRATION CAMPS Black Whde 60 minutes VHS Irrefutable testimony lesson world must never forgetl 12-15 THE AIR FORCE STORY Vat weeg I-IV Black White t20 minutes VHS Over seven hours aerial combat tour videocassenes Wright Brothers dogfights Migs Send COMMAND POST VIDEO PO Box 1500 Crestview FIn 32538 April 1987 47 * Better quality tapes selling for2 3 times much * rAIIJI makers EWWW HEAD LOCK 1-IEADLITE MODEL PRODUCTS CORP PO BOX 100 ALLAMUCHY NEW JERSEY 07820 following formula Load spring rate 0000d4 S D3 N terms have following meanings 11500000 torsional modulus elasticity music wire small d wire diameter large D springs mean diameter its outside diameter minus wire diameter N number active turns including closewound turns spring ends 8 constant formula gives us pounds per inch deflec tion beginning springs free length Adjust free length during winding space between coils keeping mind must fit within strut find load point springs deflection multiply rate determined means formula hy deflection decimal inches get load initial final positions landing-gear travel Remember spring already partially loaded re hound spring used landing gear full size practice Typically airplane weighing 12 lb spring wound 055-in-diameter wire outside diameter 406 having 22 active turns could installed within 500-in GD strut 12 lb distributed six lb leg main gear will produce deflection model rest about 4 dimension somewhat reduced because part models weight supported nose gear tail wheel hut reality ahsorbing landing shocks main gear Wound free length 262 such spring could deflect total 125 absorh landing load 17 lb legor roughly three times models weight spring GD 406 055-in -diameter wire will have inside diame ter 296 Because tendency increase diameter after winding spring wound 25-in-diameter mandrel length wire turn 11 22 turns plus two inactive turns end length wire needed shout 29 Add several inches gripping plier 36-in hohhy shop length wire sufficient spring As indication amount spring-hack wire after winding changing mandrel diameter 28 yields spring GD 43 Bob Dolly Wischer S-221 Lap/tam Peak Rd Delafleld WI 53018 RC Electrics/Kopski Continued page 47 once convenient meaningful way describe motor size early days now m view no longer good approach two ways can illustrated first commercially-made Electric system 05 motor eight 055 Ah 550 mAh cells Astro system gave years service fact still have well-worn motor recall measwing system perform ance specified prop operating power level just about 75 80 watts mind number stock 05 power Now understand new Astro cobalt 02 can operate about same power level Another way see such size ratings dubious value realize contemporary cobalt 05 fully capable handling over twice power first 05 system beyond new Astro FM cobalt 05 goes much farther regard Yet three motors about same physical size weight called OSs So real 05 Considering power-handling abilities Ive just described directly affect well such motors can fly given plane its no wonder would-be Electric fliers experienced ones well get confused Incidentally please note nowhere above did say mentioned motors has less power otherfor motors have power Rather motors have lack ability handle varying power levels Anyway seems clear enough 05 other such designation doesnt mean much anymore So think its time change Ithink its time appropriately describe standardize what meant motor size think modeling industry modeling consumer need standard makes sense wont become outdated changes technology new entries model motor field opinion Electric Aeromodeling Association EAA best-positioned group establish control matter think because EAA official Special Interest Group Electric designated AMA also think its right group because left itself bickering industry will never come up standards Finally Ithink time now Quite naturally Ive got some ideas own subject since Ive just opened up topical area am now going pass along Rememberyou read first Model Avia lion 146 Model Aviation 1 STAIM.ESS STEEL HEAD LOCK glow plug connector strength & long corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOIIATIC ON/OFF SWITCH prevent short circuits pocket tool box 4Charger LED INDICATOR available What motor size should First believe Electric motor size should refer way gas engine size Second believe motor size should no way related indicative physical motor dimensions characteristics material makeup Third believe size should no way tied specific battery description per Se What motor size should believe Elec tric model motor size should described such ways modelers can easily relate motors manufacture other model size requirements believe Electric model motor size should specified described just like motors other application arein elec trical power terms two basic thoughts completely consistent other understand what mean take look around house Look vacuum cleaner weed trimmer fan air conditioner electric drill different applica tions electric motors Yet have nameplates describe motor capability various combinations suitable terms including voltage current horsepower rpm etc Taking long-established standard ap proach adapting modeling use herein suggest describing model motors follows FirstPower Rating tells big motor Model motor nameplates should specify both Nominal Power Maximum Power Nominal Power would highest oper ating input power manufacturer would assure motor would operate continu ously failure-free some minimum EAA standardized time perhaps 100 hours would highest power average modeler would routinely use perfectly satisfactory flying fun would power used adver tise describe motor eg 200watt motor Maximum Power would some much higher power level motor might safely operated intermittently much shorter EAA-standardized time perhaps minute followed cool-down two ratings would describe given motor both sport competitive applica tions same time give meaningful useful guide what model size motor suited would much appropriate way presently-used displace ment analogy SecondCurrent Rating input amperes motor nameplate should specify both Nominal Current Maximum Current Nominal Current would highest input current continuous operating duty would current Nominal Power has specified Maximum Current would highest input current could safely tolerated short intermittent runs eg minute ThirdVoltage Rating cells motor nameplate should give both Nominal Voltage Maximum Voltage ratings Nominal Voltage would voltage along Nominal Current value would needed attain Nominal Power Maximum Voltage would highest voltage could applied unloaded no prop motor such resulting rpm would damaging motor factor will discussed next FourthRPM what your tach reads Continued page 154 April 1987 147 woilcfs starter system worlds integrated system starter parts starts accessories gets off superior start Hi-Tork Dynatron Hi-Tork Starter worlds powerful standard starler Hi-Tork features several innova tive safety features including patented hand guard keep hands away propeller starter switch located below handgrip help prevent accidental starts heavy-duty Dynatron Starter delivers one-third maximum power 12 volts closest competitor 47-69% torque standard 12volt starters greater output Dynatron can used 24 volts Equipped patented safety guard Dynatron backed frill two-year warranty against manufacturing defects Both outstanding starters made USA compatible other Sullivan products exemplify dedication high quality technol ogy Youll find Sullivan starters accessories dealer near Get off safe trouble-free start time Sullivan Determined leading independent testing laboratory 77FFMfR 706VR JPDUC no fly near overhead etectrcpower nes OorNohHavei5 ec PO Box5 66Ba oio MD2 224 30 732 3500 14Ye4//D RADIO CONTROL P-51 MUSTANG 25 TO 45 ENGINES WING SPAN 55 2995 THIS IS THE SIXTH RELEASE OF OUR INCREASINGLY POPULAR EASY-BUILD SHORT KITS THE REALISTIC LOOKING MUSTANG FLIES LIKE DREAM WITH FLENTY OF WING AND TAIL AREA FOR FULL-RANGE FOSITIVE CONTROL AS WITH ALL OUR SHORT-KITS THE MUSTANG IS DESIGNED AROUND FOAM WING AND BOX FRAME FUSELAGE FOR SIMPLE AND STURDY CONSTRUCTION WE FURNISH THE ESSENTIAL PARTS ALONG WITH EASY-TO-FOLLOW PLANS AND LET THE BUILDER SELECT HIS OWN WOOD AND ADDITIONAL HARD WARE SHORT KIT INCLUDES PRECISION CUT ARCOFOAM WING CORES ABS HIGH-IMPACT COWLING AND BELLY COOLER FORMED WING GUN PORTS AND EXHAUST CRYSTAL CLEAR CANOPY WITH FRAMEWORK PLYWOOD FIREWALL LANDING GEAR STRAPS BLOCKS AND SCREWS FORMED STEEL ENGINE MOUNT CONTROL SURFACE HINGES CLEAR PLANS WITH CONSTRUCTION DETAILS AND ALL NECESSARY TEMPLATES o BILL OF MATERIALS NO BALSA INCLUGEDI ORDERING SEND CHECK OR MONEY ORDER FOR 2930 PLUS i430 POSTAGE CANADIANS ADD 6501 TO WING MFG PO BOX 33 CRYSTAL LAKE IL 30014 ILLINOIS RESIDENTS ADD t// SALES TAX ALL ORDERS MUST BE IN US FUNOS SEND 350 FOR PRODUCT CATALOG DESCRIBING OUR COMPLETE LINE OP FOAM CORE REPLACEMENT WINGS ACCESSORIES KITS TOOLS AND MUCH MORE CATALOG FREE WITH ORDER c PHONE vi 815-459-0417 Matched PerTormance TOP PERFORMA K&R ENGINES ApIaneMarine K&B FUELSK&B GLOW PLUGS 9 Blends4 Choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B MicroBalloons FILLER K&B SUPER FOXY RESIN K&B SUPER POXY THINNER K&R SUPER POXY PRIMER K&B SUPER FOXY PAINT K&B MIXING CUPS K7s4E HO BRYN TOE AWAYHO SB OIIIDE AWAYHn RBYH TOE AWAYNO BBYHT DC AWAY 22 long 9sipuo CONCORDE Slingshot glider kit PP FAMOUS BRITISH DIESELS ALOG-DIESEL HANDBOOK pp HOBBY HIDEWAYDELAVANIL 244-7389 61734 HOBBYHOEnWAYHORBYHIOEAWAVHOBBYHISEAWaY9IOBBYHIOCAW U U ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 1O 11 & 12 1987 presented Weak Signals RIO Club Toledo Ohio RC Electrics/Kopski Continued page 146 nameplate rating should give both Nominal RPM Maximum RPM values Nominal RPM would armature speed corresponding Nominal Power Nominal Current Nominal Voltage conditions pre viously defined would specific-example value usable motor rpm course Maximum RPM would unloaded no prop armature speed attalned Maxi mum Voltage applied Maximum RPM motor would speed motor could run sustained period time eg 10 minutes physical damage like windings being thrown off vibration induc ing bearing failures rating would operating specification much would quality since motor would normally expected used unloaded However would assure advise modeler limits avoid Summarizing above suggestions Elec tric model motor nameplate might look like SUPER WIS BANG 300 Input Power Nom/Max 300/700 Input Current Nom/Max 18/42 Input Voltage Nom/Max 16/28 RPMNom/Max 9/20 watts amperes volts x 1000 nice thing about voltage current rpm ratings quantities average modeler can easily measure multimeter tach thats needed Thus experimenting prop selection example can safely knowing cell count observing motor current ammeter xposioion innormation available contacting Wayne Veager co-director ticket address shown below ADVANCED TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon US Stamps orders above 5 tickets must contain extra postage Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $400 perday adults $100 per day children 12 under Deadline ticket orders March 31 1987 Ticket sales final non rCfint1ohho After some familiarization motor ratings average modeler could easily confidently optimize power systemcell count cell size operating current prop size total weight etcfor kind flying wants exactly what Ive doing years difference determine motor specifications myselfoften ultimate cost realize may still just lots gibberish readers just like 05 nowadays Ill have follow-up column coverage what ratings mean can easily understood applied un like 05 Sizing motors way would make very easy modelers motor makers kit makers follow same drummer flying field review column has illustrated popular method describing Electric motor size displacement analogy once simple meaningful useful no longer column strongly suggesting new method motor rating adopted standard ized based meaningful measurable parameters detailed example may done has given column strongly encourages industry us under guidelines estab lished maybe tested assured EAA seal approval sorts saying what manufacturer clalms true As serious Electric model consumer Id welcome such nameplate information As serious columnist Id go far put some products test report results just cross-check course finally no serious model motor supplier should find objection such specification stan dardization exactiy above similar orders program will returned near mid-March Tickets also available door COMPETITION CLASS NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models COMPETITION BOAT MILITARY SCALE BOAT HELICOPTER PLEASURE POWER BOAT R/C CAR WORKING VESSEL-UNARMED 154 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACHINECUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $2995 ELECTRA L ITE-ICARUSPANTERAMETEORELECTRICUSWHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 Thus model motors domestic imported could classified using competition brought about such truth labels would benefit us know business making motorslacking other standardthis way Id characterize specify product Id go great length explain potential customers what stuff means use Just think nice would buy kit 100-watt-class motor rather kit 05 motorfor sald earlier Huh Whats 05 Which 05 new unbelievable motor columnist has obtained exclusive information about new motor currently under speculative development Usually-reliable sources have provided photo herein showing some aspects ofthis motor motor claimed unprecedented size power modeling applications incorporate ultra-high-technology including exclusively-developed unipolar electro magnetic principle allows motor run brush However exciting aspect new product its application very rare field magnet material rare earth substance known Unobtalniumclaimed 37 times powerful best cobalt material 4 weight No information available time except motor expected available April 11988 So much another month Please forward comment question SASE please author Bob Kopski 25 West End Dr Lansdale PA 19446 PS current winter project Davey Systems Caliph Photos comments later column Also workshow easily modify new Astro DC DC Super Charger make constant-current charger will remove need frequently readjust con trol knob will allow use car engine running RC Giant Scale/de Vries Continued page 49 Dick Phillips publishing company ViP Aero Publishers Inc PO Box 16103 Color ado Springs CO 80935 latest second book interest U U U U U U U U U I U U U U mu EE__EU_EU U.U SIG QUALITY FUELS * Special Igniters improve cold starting idle characteristics U * High Film Strength Additives increase lubricity provide maximum lean run protection Special Detergents help prevent varnish promote clean burning Rust Preventatives protect expensive engines corrosion * * SIG CHAMPION 2-STROKE FUEL FREIGHT FREE SHIPPING ON ORDERS OVER $1500COLLECT PINT QUART GALLON 55 GAL DRUM 0%Nitnutethane$31$450$1050$19000 5%Nitromethane$35$$25$1250$25800 10%Nitroyyttttane$445$550$14 50$32500 15%Nitromtharte$4$2$1650$38500 25%Nitromethane$495$750S209S$52000 35%Nitromethane$51t 75$249$$66000 SIGPREMIUM4-STROKE FUEL 10%Nitromethane$415$5 50$13 95$29500 15%Nitromethane$425$625$15 95$35900 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending fuel finest quality ingredients available alcohol 995% pure very best grade available nitromethafle use 100 o pure get honest portion based % volume maximum lubrication get perfect 50/50 blend Bakers AA Castor Oil Klotz Techniplate Racing Oil protect expensive engines finest quality fuel can made price Dont take word try some judge yourselfi See dealer first available order direct Call 800-247-5008 toll free orders Latest Catalog $300 __ SIG MANUFACTURING CO Montezuma IA 50171 Prices Sobiect chanee notice Giant Scalers power birds Quadra engines other gas-powered engines similar type Dario Brisighella Mr Quadra author Firewall Forward Quadra Bible Having run text book through old word-processor 20 times down-loaded typesetter having proofread another 10 times think Im safe saying anything want know about care feeding operation maintenance Quadra series engines book expertise youll gain reading will stand good stead operate converted chain-saw leaf-blower other small industrial engines Giant happy event want own copy fully-illustrated book its color cover can order directly us $1295 plus U U U U U U U U p p I I U I U $150 postage handling may obtained also RCM Zenith Aviation Books model dealers patronize Ace K/C Royal Products Dab operates US Quadra 1032 E Manitowoc Oak Creek WI 53154 has book sale might cajoled providing autographed copy Good book says immodestly Plans going forward 1987 version IMAAs Flying Festival Itll much earlier past June 11-14to avoid heat humidity experienced inprevious Festivals 1987 location will absolutely boggle mind Its Converse IN former military auxiliary airfield provides 55 solid acres paved surface Jerry Smith IMAAs official photo PRODUCTS FOR PAIJIU MODELER Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems UnsurpesJ April1987 155 HIGH PERFORMANCE FLAP h1ZI~ m 0 GOt S,bonS FASTER & SAFER ziIIIJ S z Sii0a St rOaR S L Rh t gOt iZZI Siow tot hot pianos doolia tandina peed 5a0itioytO patOmCOOS Use cieci SCiipiSflOO-CctioCtOO Sty tt,oitieonyott switCh 80001 Folly adjuotebie iii aittori easy notaliatlon Onadyburit Cowan corn otete nsiruotioos 5550 i2eOrpicei sand FREE Broctiota Deal moo,, noted xeda/uaIte 9aa Ion1wI 2615 Montana Lawrence Ks 66044
Edition: Model Aviation - 1987/04
Page Numbers: 46, 47, 146, 147, 154, 155
Radio Control E lectrics Bob Kopski BEGINNERS Based incoming mail Elec tric enjoying strong steady growth new participants joining get lots mail substantial portion modelers new Electric folks usually have beginner questions such Im continually reminded need keep substantial percentage column allocated covering need personally know very easy experi enced modelers take some basic things granted may major impasses first-time Electric modelers some example sub jects Batteries Ive said before continues true batteries related matters continue bring questions some infor mation common points confusion photos shows variety nickelcadmium cells types used RC system packs and/or Electric power systems photo clearly shows variety physical sizes have time another used sizes table below lists some particulars cells can easily see photo table what would expect higher cell capacity ampere-hours Ah larger heavier cell Simple say Yes necessarily first-time Electric modelers may have some advice local expert about5002300811 some magic cell ighs half much6002680945 runs longer Well far know there8003351182 no such magic cells ampere-9503991407 hours capacity cell has larger is12005081792 physically heavier thats 46 Model Aviation Cell Capacity CellWeight Nominal mAhgramsounces 70560198 100740261 2751350476 Exclusive photo some aspects forthcoming new unbelievable motor Unipolar design requires brushhere connected power wire Sermos 600-amp connector little prop isa standard B x 3 shown comparison supersecret field magnets made rare-earth Unobtainium allowed photographed Avarletyof Ni-Cd ceils ranging capacityfrom 70 mAh L 1200 mAh R Celivolume weight closely proportional capacitybut have same nominal terminal voltage 12 volts isa function cell chemistry cell size Author Kopski addresses topic months column table can provide some interesting insight example drew plot showing cell weight nominal capacity grid paper guess what Its essentially straight line What means cell weight cell capacity essentially linearly related want double motor run time other things being constant must essentially double bat tery capacityand weight dont let anyone L array so-called 05 motors ones shown have power-handling capacity ranging about 80 watts over 150 watts Gear belt speed-reducers change basic capability motor So lust what 05 second photo R further Illustrates confusion over motor size motors include so-called OSs 075s 1 Os 15s 25s1 Most labeled Lack motorspecification standards make very difficult know whats what what once youve got Author Bob Kopskl proclaims Electric has matured point meaningful standards necessary tell different Incidentally nominal capacity table above advertised label value cells shown Nickel-cadmium Ni-Cd cellsno matter what sizehave same terminal voltage cell see photo has same voltage output nominal loads Thus both tiny 70 mAli milliampere-hour cell familiar 12 Ah 1200 milliampere-hour cell have same nominal 12 volts output However under very heavy current loads such required motors actual cell voltage decreases somewhat due losses internal cell resistance voltage depression gener ally greater smaller cells battery group cells connected gether hobby almost always series connection means cells wired end-to-end battery voltage total sum cell voltages Thus fourcell battery has terminal voltage 4 x 12 48 volts very important cells ins battery same capacity size Thus always uses example 12 Ah cells same batteryor 800 mAh cells same battery never mixes other sizes Battery charging current always deter mined cell size independent number cells Thus like charge empty 12 Ah packs 42 amps 15 minutes no matter cells pack So summary Ni-Cd cells available wide variety sizes capacities expressed ampere-hours cell volume weight essentially directly proportional capacity such cells have same nominal terminal voltage 12 volts battery composed cell cells must same size Finally battery charge current related cell size number cells Additional in-depth discussions other battery topics can found inthe December 1983 issue Model Aviation Electric supplies Charles Sylvia Middleboro MA has gradually building Electric related supplies business offers reliable mail order service attractive pricing Charlie has catalog wares normally costs some coins Charlie making special offer readers column can get new catalog free simply telling Charlie read about column always knew valuable column Send letter CS Flight Systems 31 Perry St Box 775 Middieboro MA 02346 telephone number 617 947-2805 Motor size continuing trouble-spot rapidly-growing area Electric always question motor size related question What motor goes what plane beginning early Seventies long ago far away very dawn serious Electric interest country simple size descrip tion Electric motors put place simply describe motors terms familiar gas engines Thus now-commonplace 05 Electric taken mean motor would turn same prop fly same plane everyday sport 049 glow engineexcept weight considerations course Electric has come long way since early Seventies original size designation scheme has continued place However what Continued page 146 1 WHY VIETNAM Color black awl white 60 minutes VHSB TARGET FOR TODAY Black white 60 minutes VHS Official US policy involvement Vietnam recounts Made under operational conditions members combat victorious banle ot KHE-SHANcamera units United Kingdom 1943 2THE MEMPHIS BELLE Color 43 minutes VHSB FIGHTER BOMBERS Color 70 minutes VHS Takes actual combat mission deep Germany sequences far some ot spectacular ever EXCITINGfilmed ot war 1mm air 3 THE TRUE GLORY Black white 85 minutes VHS Normandy landing Germanys sarrendw 4 WAR IN THE PACIFIC Black wEte 60 minutes VHS Pearl Harbor New Guinea invasion otthe Phillippines 5 NUREMBERG TRIALS Black wllte 76 minutes VHS Much footage confiscated private Ibraries ot high Nazi officiulo S HISTORY OFTHE KOREAN WAR Biockand white 60 minutes VHS detinifive bivody record Koreas savage contlict immor talized combat cameramen 7 THIS IS GERMANY Black whife60 minutes VHS unhistorical documentota time after madness overcame mankind Postage paid US Canada/Foreign orders add $500 Fin res add 5 percent Sales tax accept Mastercard Visa American Express MD COD Include No Exp date 10 FLAK JUGS AND COBRAS Black white 96 minutes VHS Flak avoidance iv B-f flying P-47 Thunderbolt P-39 Air Cobra 11 NAZI CONCENTRATION CAMPS Black Whde 60 minutes VHS Irrefutable testimony lesson world must never forgetl 12-15 THE AIR FORCE STORY Vat weeg I-IV Black White t20 minutes VHS Over seven hours aerial combat tour videocassenes Wright Brothers dogfights Migs Send COMMAND POST VIDEO PO Box 1500 Crestview FIn 32538 April 1987 47 * Better quality tapes selling for2 3 times much * rAIIJI makers EWWW HEAD LOCK 1-IEADLITE MODEL PRODUCTS CORP PO BOX 100 ALLAMUCHY NEW JERSEY 07820 following formula Load spring rate 0000d4 S D3 N terms have following meanings 11500000 torsional modulus elasticity music wire small d wire diameter large D springs mean diameter its outside diameter minus wire diameter N number active turns including closewound turns spring ends 8 constant formula gives us pounds per inch deflec tion beginning springs free length Adjust free length during winding space between coils keeping mind must fit within strut find load point springs deflection multiply rate determined means formula hy deflection decimal inches get load initial final positions landing-gear travel Remember spring already partially loaded re hound spring used landing gear full size practice Typically airplane weighing 12 lb spring wound 055-in-diameter wire outside diameter 406 having 22 active turns could installed within 500-in GD strut 12 lb distributed six lb leg main gear will produce deflection model rest about 4 dimension somewhat reduced because part models weight supported nose gear tail wheel hut reality ahsorbing landing shocks main gear Wound free length 262 such spring could deflect total 125 absorh landing load 17 lb legor roughly three times models weight spring GD 406 055-in -diameter wire will have inside diame ter 296 Because tendency increase diameter after winding spring wound 25-in-diameter mandrel length wire turn 11 22 turns plus two inactive turns end length wire needed shout 29 Add several inches gripping plier 36-in hohhy shop length wire sufficient spring As indication amount spring-hack wire after winding changing mandrel diameter 28 yields spring GD 43 Bob Dolly Wischer S-221 Lap/tam Peak Rd Delafleld WI 53018 RC Electrics/Kopski Continued page 47 once convenient meaningful way describe motor size early days now m view no longer good approach two ways can illustrated first commercially-made Electric system 05 motor eight 055 Ah 550 mAh cells Astro system gave years service fact still have well-worn motor recall measwing system perform ance specified prop operating power level just about 75 80 watts mind number stock 05 power Now understand new Astro cobalt 02 can operate about same power level Another way see such size ratings dubious value realize contemporary cobalt 05 fully capable handling over twice power first 05 system beyond new Astro FM cobalt 05 goes much farther regard Yet three motors about same physical size weight called OSs So real 05 Considering power-handling abilities Ive just described directly affect well such motors can fly given plane its no wonder would-be Electric fliers experienced ones well get confused Incidentally please note nowhere above did say mentioned motors has less power otherfor motors have power Rather motors have lack ability handle varying power levels Anyway seems clear enough 05 other such designation doesnt mean much anymore So think its time change Ithink its time appropriately describe standardize what meant motor size think modeling industry modeling consumer need standard makes sense wont become outdated changes technology new entries model motor field opinion Electric Aeromodeling Association EAA best-positioned group establish control matter think because EAA official Special Interest Group Electric designated AMA also think its right group because left itself bickering industry will never come up standards Finally Ithink time now Quite naturally Ive got some ideas own subject since Ive just opened up topical area am now going pass along Rememberyou read first Model Avia lion 146 Model Aviation 1 STAIM.ESS STEEL HEAD LOCK glow plug connector strength & long corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOIIATIC ON/OFF SWITCH prevent short circuits pocket tool box 4Charger LED INDICATOR available What motor size should First believe Electric motor size should refer way gas engine size Second believe motor size should no way related indicative physical motor dimensions characteristics material makeup Third believe size should no way tied specific battery description per Se What motor size should believe Elec tric model motor size should described such ways modelers can easily relate motors manufacture other model size requirements believe Electric model motor size should specified described just like motors other application arein elec trical power terms two basic thoughts completely consistent other understand what mean take look around house Look vacuum cleaner weed trimmer fan air conditioner electric drill different applica tions electric motors Yet have nameplates describe motor capability various combinations suitable terms including voltage current horsepower rpm etc Taking long-established standard ap proach adapting modeling use herein suggest describing model motors follows FirstPower Rating tells big motor Model motor nameplates should specify both Nominal Power Maximum Power Nominal Power would highest oper ating input power manufacturer would assure motor would operate continu ously failure-free some minimum EAA standardized time perhaps 100 hours would highest power average modeler would routinely use perfectly satisfactory flying fun would power used adver tise describe motor eg 200watt motor Maximum Power would some much higher power level motor might safely operated intermittently much shorter EAA-standardized time perhaps minute followed cool-down two ratings would describe given motor both sport competitive applica tions same time give meaningful useful guide what model size motor suited would much appropriate way presently-used displace ment analogy SecondCurrent Rating input amperes motor nameplate should specify both Nominal Current Maximum Current Nominal Current would highest input current continuous operating duty would current Nominal Power has specified Maximum Current would highest input current could safely tolerated short intermittent runs eg minute ThirdVoltage Rating cells motor nameplate should give both Nominal Voltage Maximum Voltage ratings Nominal Voltage would voltage along Nominal Current value would needed attain Nominal Power Maximum Voltage would highest voltage could applied unloaded no prop motor such resulting rpm would damaging motor factor will discussed next FourthRPM what your tach reads Continued page 154 April 1987 147 woilcfs starter system worlds integrated system starter parts starts accessories gets off superior start Hi-Tork Dynatron Hi-Tork Starter worlds powerful standard starler Hi-Tork features several innova tive safety features including patented hand guard keep hands away propeller starter switch located below handgrip help prevent accidental starts heavy-duty Dynatron Starter delivers one-third maximum power 12 volts closest competitor 47-69% torque standard 12volt starters greater output Dynatron can used 24 volts Equipped patented safety guard Dynatron backed frill two-year warranty against manufacturing defects Both outstanding starters made USA compatible other Sullivan products exemplify dedication high quality technol ogy Youll find Sullivan starters accessories dealer near Get off safe trouble-free start time Sullivan Determined leading independent testing laboratory 77FFMfR 706VR JPDUC no fly near overhead etectrcpower nes OorNohHavei5 ec PO Box5 66Ba oio MD2 224 30 732 3500 14Ye4//D RADIO CONTROL P-51 MUSTANG 25 TO 45 ENGINES WING SPAN 55 2995 THIS IS THE SIXTH RELEASE OF OUR INCREASINGLY POPULAR EASY-BUILD SHORT KITS THE REALISTIC LOOKING MUSTANG FLIES LIKE DREAM WITH FLENTY OF WING AND TAIL AREA FOR FULL-RANGE FOSITIVE CONTROL AS WITH ALL OUR SHORT-KITS THE MUSTANG IS DESIGNED AROUND FOAM WING AND BOX FRAME FUSELAGE FOR SIMPLE AND STURDY CONSTRUCTION WE FURNISH THE ESSENTIAL PARTS ALONG WITH EASY-TO-FOLLOW PLANS AND LET THE BUILDER SELECT HIS OWN WOOD AND ADDITIONAL HARD WARE SHORT KIT INCLUDES PRECISION CUT ARCOFOAM WING CORES ABS HIGH-IMPACT COWLING AND BELLY COOLER FORMED WING GUN PORTS AND EXHAUST CRYSTAL CLEAR CANOPY WITH FRAMEWORK PLYWOOD FIREWALL LANDING GEAR STRAPS BLOCKS AND SCREWS FORMED STEEL ENGINE MOUNT CONTROL SURFACE HINGES CLEAR PLANS WITH CONSTRUCTION DETAILS AND ALL NECESSARY TEMPLATES o BILL OF MATERIALS NO BALSA INCLUGEDI ORDERING SEND CHECK OR MONEY ORDER FOR 2930 PLUS i430 POSTAGE CANADIANS ADD 6501 TO WING MFG PO BOX 33 CRYSTAL LAKE IL 30014 ILLINOIS RESIDENTS ADD t// SALES TAX ALL ORDERS MUST BE IN US FUNOS SEND 350 FOR PRODUCT CATALOG DESCRIBING OUR COMPLETE LINE OP FOAM CORE REPLACEMENT WINGS ACCESSORIES KITS TOOLS AND MUCH MORE CATALOG FREE WITH ORDER c PHONE vi 815-459-0417 Matched PerTormance TOP PERFORMA K&R ENGINES ApIaneMarine K&B FUELSK&B GLOW PLUGS 9 Blends4 Choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B MicroBalloons FILLER K&B SUPER FOXY RESIN K&B SUPER POXY THINNER K&R SUPER POXY PRIMER K&B SUPER FOXY PAINT K&B MIXING CUPS K7s4E HO BRYN TOE AWAYHO SB OIIIDE AWAYHn RBYH TOE AWAYNO BBYHT DC AWAY 22 long 9sipuo CONCORDE Slingshot glider kit PP FAMOUS BRITISH DIESELS ALOG-DIESEL HANDBOOK pp HOBBY HIDEWAYDELAVANIL 244-7389 61734 HOBBYHOEnWAYHORBYHIOEAWAVHOBBYHISEAWaY9IOBBYHIOCAW U U ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 1O 11 & 12 1987 presented Weak Signals RIO Club Toledo Ohio RC Electrics/Kopski Continued page 146 nameplate rating should give both Nominal RPM Maximum RPM values Nominal RPM would armature speed corresponding Nominal Power Nominal Current Nominal Voltage conditions pre viously defined would specific-example value usable motor rpm course Maximum RPM would unloaded no prop armature speed attalned Maxi mum Voltage applied Maximum RPM motor would speed motor could run sustained period time eg 10 minutes physical damage like windings being thrown off vibration induc ing bearing failures rating would operating specification much would quality since motor would normally expected used unloaded However would assure advise modeler limits avoid Summarizing above suggestions Elec tric model motor nameplate might look like SUPER WIS BANG 300 Input Power Nom/Max 300/700 Input Current Nom/Max 18/42 Input Voltage Nom/Max 16/28 RPMNom/Max 9/20 watts amperes volts x 1000 nice thing about voltage current rpm ratings quantities average modeler can easily measure multimeter tach thats needed Thus experimenting prop selection example can safely knowing cell count observing motor current ammeter xposioion innormation available contacting Wayne Veager co-director ticket address shown below ADVANCED TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon US Stamps orders above 5 tickets must contain extra postage Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $400 perday adults $100 per day children 12 under Deadline ticket orders March 31 1987 Ticket sales final non rCfint1ohho After some familiarization motor ratings average modeler could easily confidently optimize power systemcell count cell size operating current prop size total weight etcfor kind flying wants exactly what Ive doing years difference determine motor specifications myselfoften ultimate cost realize may still just lots gibberish readers just like 05 nowadays Ill have follow-up column coverage what ratings mean can easily understood applied un like 05 Sizing motors way would make very easy modelers motor makers kit makers follow same drummer flying field review column has illustrated popular method describing Electric motor size displacement analogy once simple meaningful useful no longer column strongly suggesting new method motor rating adopted standard ized based meaningful measurable parameters detailed example may done has given column strongly encourages industry us under guidelines estab lished maybe tested assured EAA seal approval sorts saying what manufacturer clalms true As serious Electric model consumer Id welcome such nameplate information As serious columnist Id go far put some products test report results just cross-check course finally no serious model motor supplier should find objection such specification stan dardization exactiy above similar orders program will returned near mid-March Tickets also available door COMPETITION CLASS NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models COMPETITION BOAT MILITARY SCALE BOAT HELICOPTER PLEASURE POWER BOAT R/C CAR WORKING VESSEL-UNARMED 154 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACHINECUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $2995 ELECTRA L ITE-ICARUSPANTERAMETEORELECTRICUSWHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 Thus model motors domestic imported could classified using competition brought about such truth labels would benefit us know business making motorslacking other standardthis way Id characterize specify product Id go great length explain potential customers what stuff means use Just think nice would buy kit 100-watt-class motor rather kit 05 motorfor sald earlier Huh Whats 05 Which 05 new unbelievable motor columnist has obtained exclusive information about new motor currently under speculative development Usually-reliable sources have provided photo herein showing some aspects ofthis motor motor claimed unprecedented size power modeling applications incorporate ultra-high-technology including exclusively-developed unipolar electro magnetic principle allows motor run brush However exciting aspect new product its application very rare field magnet material rare earth substance known Unobtalniumclaimed 37 times powerful best cobalt material 4 weight No information available time except motor expected available April 11988 So much another month Please forward comment question SASE please author Bob Kopski 25 West End Dr Lansdale PA 19446 PS current winter project Davey Systems Caliph Photos comments later column Also workshow easily modify new Astro DC DC Super Charger make constant-current charger will remove need frequently readjust con trol knob will allow use car engine running RC Giant Scale/de Vries Continued page 49 Dick Phillips publishing company ViP Aero Publishers Inc PO Box 16103 Color ado Springs CO 80935 latest second book interest U U U U U U U U U I U U U U mu EE__EU_EU U.U SIG QUALITY FUELS * Special Igniters improve cold starting idle characteristics U * High Film Strength Additives increase lubricity provide maximum lean run protection Special Detergents help prevent varnish promote clean burning Rust Preventatives protect expensive engines corrosion * * SIG CHAMPION 2-STROKE FUEL FREIGHT FREE SHIPPING ON ORDERS OVER $1500COLLECT PINT QUART GALLON 55 GAL DRUM 0%Nitnutethane$31$450$1050$19000 5%Nitromethane$35$$25$1250$25800 10%Nitroyyttttane$445$550$14 50$32500 15%Nitromtharte$4$2$1650$38500 25%Nitromethane$495$750S209S$52000 35%Nitromethane$51t 75$249$$66000 SIGPREMIUM4-STROKE FUEL 10%Nitromethane$415$5 50$13 95$29500 15%Nitromethane$425$625$15 95$35900 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending fuel finest quality ingredients available alcohol 995% pure very best grade available nitromethafle use 100 o pure get honest portion based % volume maximum lubrication get perfect 50/50 blend Bakers AA Castor Oil Klotz Techniplate Racing Oil protect expensive engines finest quality fuel can made price Dont take word try some judge yourselfi See dealer first available order direct Call 800-247-5008 toll free orders Latest Catalog $300 __ SIG MANUFACTURING CO Montezuma IA 50171 Prices Sobiect chanee notice Giant Scalers power birds Quadra engines other gas-powered engines similar type Dario Brisighella Mr Quadra author Firewall Forward Quadra Bible Having run text book through old word-processor 20 times down-loaded typesetter having proofread another 10 times think Im safe saying anything want know about care feeding operation maintenance Quadra series engines book expertise youll gain reading will stand good stead operate converted chain-saw leaf-blower other small industrial engines Giant happy event want own copy fully-illustrated book its color cover can order directly us $1295 plus U U U U U U U U p p I I U I U $150 postage handling may obtained also RCM Zenith Aviation Books model dealers patronize Ace K/C Royal Products Dab operates US Quadra 1032 E Manitowoc Oak Creek WI 53154 has book sale might cajoled providing autographed copy Good book says immodestly Plans going forward 1987 version IMAAs Flying Festival Itll much earlier past June 11-14to avoid heat humidity experienced inprevious Festivals 1987 location will absolutely boggle mind Its Converse IN former military auxiliary airfield provides 55 solid acres paved surface Jerry Smith IMAAs official photo PRODUCTS FOR PAIJIU MODELER Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems UnsurpesJ April1987 155 HIGH PERFORMANCE FLAP h1ZI~ m 0 GOt S,bonS FASTER & SAFER ziIIIJ S z Sii0a St rOaR S L Rh t gOt iZZI Siow tot hot pianos doolia tandina peed 5a0itioytO patOmCOOS Use cieci SCiipiSflOO-CctioCtOO Sty tt,oitieonyott switCh 80001 Folly adjuotebie iii aittori easy notaliatlon Onadyburit Cowan corn otete nsiruotioos 5550 i2eOrpicei sand FREE Broctiota Deal moo,, noted xeda/uaIte 9aa Ion1wI 2615 Montana Lawrence Ks 66044
Edition: Model Aviation - 1987/04
Page Numbers: 46, 47, 146, 147, 154, 155
Radio Control E lectrics Bob Kopski BEGINNERS Based incoming mail Elec tric enjoying strong steady growth new participants joining get lots mail substantial portion modelers new Electric folks usually have beginner questions such Im continually reminded need keep substantial percentage column allocated covering need personally know very easy experi enced modelers take some basic things granted may major impasses first-time Electric modelers some example sub jects Batteries Ive said before continues true batteries related matters continue bring questions some infor mation common points confusion photos shows variety nickelcadmium cells types used RC system packs and/or Electric power systems photo clearly shows variety physical sizes have time another used sizes table below lists some particulars cells can easily see photo table what would expect higher cell capacity ampere-hours Ah larger heavier cell Simple say Yes necessarily first-time Electric modelers may have some advice local expert about5002300811 some magic cell ighs half much6002680945 runs longer Well far know there8003351182 no such magic cells ampere-9503991407 hours capacity cell has larger is12005081792 physically heavier thats 46 Model Aviation Cell Capacity CellWeight Nominal mAhgramsounces 70560198 100740261 2751350476 Exclusive photo some aspects forthcoming new unbelievable motor Unipolar design requires brushhere connected power wire Sermos 600-amp connector little prop isa standard B x 3 shown comparison supersecret field magnets made rare-earth Unobtainium allowed photographed Avarletyof Ni-Cd ceils ranging capacityfrom 70 mAh L 1200 mAh R Celivolume weight closely proportional capacitybut have same nominal terminal voltage 12 volts isa function cell chemistry cell size Author Kopski addresses topic months column table can provide some interesting insight example drew plot showing cell weight nominal capacity grid paper guess what Its essentially straight line What means cell weight cell capacity essentially linearly related want double motor run time other things being constant must essentially double bat tery capacityand weight dont let anyone L array so-called 05 motors ones shown have power-handling capacity ranging about 80 watts over 150 watts Gear belt speed-reducers change basic capability motor So lust what 05 second photo R further Illustrates confusion over motor size motors include so-called OSs 075s 1 Os 15s 25s1 Most labeled Lack motorspecification standards make very difficult know whats what what once youve got Author Bob Kopskl proclaims Electric has matured point meaningful standards necessary tell different Incidentally nominal capacity table above advertised label value cells shown Nickel-cadmium Ni-Cd cellsno matter what sizehave same terminal voltage cell see photo has same voltage output nominal loads Thus both tiny 70 mAli milliampere-hour cell familiar 12 Ah 1200 milliampere-hour cell have same nominal 12 volts output However under very heavy current loads such required motors actual cell voltage decreases somewhat due losses internal cell resistance voltage depression gener ally greater smaller cells battery group cells connected gether hobby almost always series connection means cells wired end-to-end battery voltage total sum cell voltages Thus fourcell battery has terminal voltage 4 x 12 48 volts very important cells ins battery same capacity size Thus always uses example 12 Ah cells same batteryor 800 mAh cells same battery never mixes other sizes Battery charging current always deter mined cell size independent number cells Thus like charge empty 12 Ah packs 42 amps 15 minutes no matter cells pack So summary Ni-Cd cells available wide variety sizes capacities expressed ampere-hours cell volume weight essentially directly proportional capacity such cells have same nominal terminal voltage 12 volts battery composed cell cells must same size Finally battery charge current related cell size number cells Additional in-depth discussions other battery topics can found inthe December 1983 issue Model Aviation Electric supplies Charles Sylvia Middleboro MA has gradually building Electric related supplies business offers reliable mail order service attractive pricing Charlie has catalog wares normally costs some coins Charlie making special offer readers column can get new catalog free simply telling Charlie read about column always knew valuable column Send letter CS Flight Systems 31 Perry St Box 775 Middieboro MA 02346 telephone number 617 947-2805 Motor size continuing trouble-spot rapidly-growing area Electric always question motor size related question What motor goes what plane beginning early Seventies long ago far away very dawn serious Electric interest country simple size descrip tion Electric motors put place simply describe motors terms familiar gas engines Thus now-commonplace 05 Electric taken mean motor would turn same prop fly same plane everyday sport 049 glow engineexcept weight considerations course Electric has come long way since early Seventies original size designation scheme has continued place However what Continued page 146 1 WHY VIETNAM Color black awl white 60 minutes VHSB TARGET FOR TODAY Black white 60 minutes VHS Official US policy involvement Vietnam recounts Made under operational conditions members combat victorious banle ot KHE-SHANcamera units United Kingdom 1943 2THE MEMPHIS BELLE Color 43 minutes VHSB FIGHTER BOMBERS Color 70 minutes VHS Takes actual combat mission deep Germany sequences far some ot spectacular ever EXCITINGfilmed ot war 1mm air 3 THE TRUE GLORY Black white 85 minutes VHS Normandy landing Germanys sarrendw 4 WAR IN THE PACIFIC Black wEte 60 minutes VHS Pearl Harbor New Guinea invasion otthe Phillippines 5 NUREMBERG TRIALS Black wllte 76 minutes VHS Much footage confiscated private Ibraries ot high Nazi officiulo S HISTORY OFTHE KOREAN WAR Biockand white 60 minutes VHS detinifive bivody record Koreas savage contlict immor talized combat cameramen 7 THIS IS GERMANY Black whife60 minutes VHS unhistorical documentota time after madness overcame mankind Postage paid US Canada/Foreign orders add $500 Fin res add 5 percent Sales tax accept Mastercard Visa American Express MD COD Include No Exp date 10 FLAK JUGS AND COBRAS Black white 96 minutes VHS Flak avoidance iv B-f flying P-47 Thunderbolt P-39 Air Cobra 11 NAZI CONCENTRATION CAMPS Black Whde 60 minutes VHS Irrefutable testimony lesson world must never forgetl 12-15 THE AIR FORCE STORY Vat weeg I-IV Black White t20 minutes VHS Over seven hours aerial combat tour videocassenes Wright Brothers dogfights Migs Send COMMAND POST VIDEO PO Box 1500 Crestview FIn 32538 April 1987 47 * Better quality tapes selling for2 3 times much * rAIIJI makers EWWW HEAD LOCK 1-IEADLITE MODEL PRODUCTS CORP PO BOX 100 ALLAMUCHY NEW JERSEY 07820 following formula Load spring rate 0000d4 S D3 N terms have following meanings 11500000 torsional modulus elasticity music wire small d wire diameter large D springs mean diameter its outside diameter minus wire diameter N number active turns including closewound turns spring ends 8 constant formula gives us pounds per inch deflec tion beginning springs free length Adjust free length during winding space between coils keeping mind must fit within strut find load point springs deflection multiply rate determined means formula hy deflection decimal inches get load initial final positions landing-gear travel Remember spring already partially loaded re hound spring used landing gear full size practice Typically airplane weighing 12 lb spring wound 055-in-diameter wire outside diameter 406 having 22 active turns could installed within 500-in GD strut 12 lb distributed six lb leg main gear will produce deflection model rest about 4 dimension somewhat reduced because part models weight supported nose gear tail wheel hut reality ahsorbing landing shocks main gear Wound free length 262 such spring could deflect total 125 absorh landing load 17 lb legor roughly three times models weight spring GD 406 055-in -diameter wire will have inside diame ter 296 Because tendency increase diameter after winding spring wound 25-in-diameter mandrel length wire turn 11 22 turns plus two inactive turns end length wire needed shout 29 Add several inches gripping plier 36-in hohhy shop length wire sufficient spring As indication amount spring-hack wire after winding changing mandrel diameter 28 yields spring GD 43 Bob Dolly Wischer S-221 Lap/tam Peak Rd Delafleld WI 53018 RC Electrics/Kopski Continued page 47 once convenient meaningful way describe motor size early days now m view no longer good approach two ways can illustrated first commercially-made Electric system 05 motor eight 055 Ah 550 mAh cells Astro system gave years service fact still have well-worn motor recall measwing system perform ance specified prop operating power level just about 75 80 watts mind number stock 05 power Now understand new Astro cobalt 02 can operate about same power level Another way see such size ratings dubious value realize contemporary cobalt 05 fully capable handling over twice power first 05 system beyond new Astro FM cobalt 05 goes much farther regard Yet three motors about same physical size weight called OSs So real 05 Considering power-handling abilities Ive just described directly affect well such motors can fly given plane its no wonder would-be Electric fliers experienced ones well get confused Incidentally please note nowhere above did say mentioned motors has less power otherfor motors have power Rather motors have lack ability handle varying power levels Anyway seems clear enough 05 other such designation doesnt mean much anymore So think its time change Ithink its time appropriately describe standardize what meant motor size think modeling industry modeling consumer need standard makes sense wont become outdated changes technology new entries model motor field opinion Electric Aeromodeling Association EAA best-positioned group establish control matter think because EAA official Special Interest Group Electric designated AMA also think its right group because left itself bickering industry will never come up standards Finally Ithink time now Quite naturally Ive got some ideas own subject since Ive just opened up topical area am now going pass along Rememberyou read first Model Avia lion 146 Model Aviation 1 STAIM.ESS STEEL HEAD LOCK glow plug connector strength & long corrosion free life 2FIELD REPLACEABLE 1 2 AH Nicad 3Built FULLY AUTOIIATIC ON/OFF SWITCH prevent short circuits pocket tool box 4Charger LED INDICATOR available What motor size should First believe Electric motor size should refer way gas engine size Second believe motor size should no way related indicative physical motor dimensions characteristics material makeup Third believe size should no way tied specific battery description per Se What motor size should believe Elec tric model motor size should described such ways modelers can easily relate motors manufacture other model size requirements believe Electric model motor size should specified described just like motors other application arein elec trical power terms two basic thoughts completely consistent other understand what mean take look around house Look vacuum cleaner weed trimmer fan air conditioner electric drill different applica tions electric motors Yet have nameplates describe motor capability various combinations suitable terms including voltage current horsepower rpm etc Taking long-established standard ap proach adapting modeling use herein suggest describing model motors follows FirstPower Rating tells big motor Model motor nameplates should specify both Nominal Power Maximum Power Nominal Power would highest oper ating input power manufacturer would assure motor would operate continu ously failure-free some minimum EAA standardized time perhaps 100 hours would highest power average modeler would routinely use perfectly satisfactory flying fun would power used adver tise describe motor eg 200watt motor Maximum Power would some much higher power level motor might safely operated intermittently much shorter EAA-standardized time perhaps minute followed cool-down two ratings would describe given motor both sport competitive applica tions same time give meaningful useful guide what model size motor suited would much appropriate way presently-used displace ment analogy SecondCurrent Rating input amperes motor nameplate should specify both Nominal Current Maximum Current Nominal Current would highest input current continuous operating duty would current Nominal Power has specified Maximum Current would highest input current could safely tolerated short intermittent runs eg minute ThirdVoltage Rating cells motor nameplate should give both Nominal Voltage Maximum Voltage ratings Nominal Voltage would voltage along Nominal Current value would needed attain Nominal Power Maximum Voltage would highest voltage could applied unloaded no prop motor such resulting rpm would damaging motor factor will discussed next FourthRPM what your tach reads Continued page 154 April 1987 147 woilcfs starter system worlds integrated system starter parts starts accessories gets off superior start Hi-Tork Dynatron Hi-Tork Starter worlds powerful standard starler Hi-Tork features several innova tive safety features including patented hand guard keep hands away propeller starter switch located below handgrip help prevent accidental starts heavy-duty Dynatron Starter delivers one-third maximum power 12 volts closest competitor 47-69% torque standard 12volt starters greater output Dynatron can used 24 volts Equipped patented safety guard Dynatron backed frill two-year warranty against manufacturing defects Both outstanding starters made USA compatible other Sullivan products exemplify dedication high quality technol ogy Youll find Sullivan starters accessories dealer near Get off safe trouble-free start time Sullivan Determined leading independent testing laboratory 77FFMfR 706VR JPDUC no fly near overhead etectrcpower nes OorNohHavei5 ec PO Box5 66Ba oio MD2 224 30 732 3500 14Ye4//D RADIO CONTROL P-51 MUSTANG 25 TO 45 ENGINES WING SPAN 55 2995 THIS IS THE SIXTH RELEASE OF OUR INCREASINGLY POPULAR EASY-BUILD SHORT KITS THE REALISTIC LOOKING MUSTANG FLIES LIKE DREAM WITH FLENTY OF WING AND TAIL AREA FOR FULL-RANGE FOSITIVE CONTROL AS WITH ALL OUR SHORT-KITS THE MUSTANG IS DESIGNED AROUND FOAM WING AND BOX FRAME FUSELAGE FOR SIMPLE AND STURDY CONSTRUCTION WE FURNISH THE ESSENTIAL PARTS ALONG WITH EASY-TO-FOLLOW PLANS AND LET THE BUILDER SELECT HIS OWN WOOD AND ADDITIONAL HARD WARE SHORT KIT INCLUDES PRECISION CUT ARCOFOAM WING CORES ABS HIGH-IMPACT COWLING AND BELLY COOLER FORMED WING GUN PORTS AND EXHAUST CRYSTAL CLEAR CANOPY WITH FRAMEWORK PLYWOOD FIREWALL LANDING GEAR STRAPS BLOCKS AND SCREWS FORMED STEEL ENGINE MOUNT CONTROL SURFACE HINGES CLEAR PLANS WITH CONSTRUCTION DETAILS AND ALL NECESSARY TEMPLATES o BILL OF MATERIALS NO BALSA INCLUGEDI ORDERING SEND CHECK OR MONEY ORDER FOR 2930 PLUS i430 POSTAGE CANADIANS ADD 6501 TO WING MFG PO BOX 33 CRYSTAL LAKE IL 30014 ILLINOIS RESIDENTS ADD t// SALES TAX ALL ORDERS MUST BE IN US FUNOS SEND 350 FOR PRODUCT CATALOG DESCRIBING OUR COMPLETE LINE OP FOAM CORE REPLACEMENT WINGS ACCESSORIES KITS TOOLS AND MUCH MORE CATALOG FREE WITH ORDER c PHONE vi 815-459-0417 Matched PerTormance TOP PERFORMA K&R ENGINES ApIaneMarine K&B FUELSK&B GLOW PLUGS 9 Blends4 Choices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B MicroBalloons FILLER K&B SUPER FOXY RESIN K&B SUPER POXY THINNER K&R SUPER POXY PRIMER K&B SUPER FOXY PAINT K&B MIXING CUPS K7s4E HO BRYN TOE AWAYHO SB OIIIDE AWAYHn RBYH TOE AWAYNO BBYHT DC AWAY 22 long 9sipuo CONCORDE Slingshot glider kit PP FAMOUS BRITISH DIESELS ALOG-DIESEL HANDBOOK pp HOBBY HIDEWAYDELAVANIL 244-7389 61734 HOBBYHOEnWAYHORBYHIOEAWAVHOBBYHISEAWaY9IOBBYHIOCAW U U ANNUAL RADIO CONTROL EXPOSITION TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO OHIO APRIL 1O 11 & 12 1987 presented Weak Signals RIO Club Toledo Ohio RC Electrics/Kopski Continued page 146 nameplate rating should give both Nominal RPM Maximum RPM values Nominal RPM would armature speed corresponding Nominal Power Nominal Current Nominal Voltage conditions pre viously defined would specific-example value usable motor rpm course Maximum RPM would unloaded no prop armature speed attalned Maxi mum Voltage applied Maximum RPM motor would speed motor could run sustained period time eg 10 minutes physical damage like windings being thrown off vibration induc ing bearing failures rating would operating specification much would quality since motor would normally expected used unloaded However would assure advise modeler limits avoid Summarizing above suggestions Elec tric model motor nameplate might look like SUPER WIS BANG 300 Input Power Nom/Max 300/700 Input Current Nom/Max 18/42 Input Voltage Nom/Max 16/28 RPMNom/Max 9/20 watts amperes volts x 1000 nice thing about voltage current rpm ratings quantities average modeler can easily measure multimeter tach thats needed Thus experimenting prop selection example can safely knowing cell count observing motor current ammeter xposioion innormation available contacting Wayne Veager co-director ticket address shown below ADVANCED TICKETS may ordered sending self-addressed-stamped busi ness size 4 x 9 envelope Tickets 38235 Castle Romulus Michigan 48174 phone 313 941-6661 Canadian orders must contain International Postal Cou pon US Stamps orders above 5 tickets must contain extra postage Include check money order US funds made payable Weak Signals R/C Club along 25 cents per order handling charge must state expo days tickets used prices $400 perday adults $100 per day children 12 under Deadline ticket orders March 31 1987 Ticket sales final non rCfint1ohho After some familiarization motor ratings average modeler could easily confidently optimize power systemcell count cell size operating current prop size total weight etcfor kind flying wants exactly what Ive doing years difference determine motor specifications myselfoften ultimate cost realize may still just lots gibberish readers just like 05 nowadays Ill have follow-up column coverage what ratings mean can easily understood applied un like 05 Sizing motors way would make very easy modelers motor makers kit makers follow same drummer flying field review column has illustrated popular method describing Electric motor size displacement analogy once simple meaningful useful no longer column strongly suggesting new method motor rating adopted standard ized based meaningful measurable parameters detailed example may done has given column strongly encourages industry us under guidelines estab lished maybe tested assured EAA seal approval sorts saying what manufacturer clalms true As serious Electric model consumer Id welcome such nameplate information As serious columnist Id go far put some products test report results just cross-check course finally no serious model motor supplier should find objection such specification stan dardization exactiy above similar orders program will returned near mid-March Tickets also available door COMPETITION CLASS NON-MILITARY SPORT SCALE PLANE AMA Rules MILITARY SPORT SCALE PLANE AMA Rules PRECISION SCALE PLANE AMA Rules PATTERN PLANE SPORT MONO-PLANE non-scale models SPORT BI-PLANE non-scale models OLD TIMER FREE FLIGHT R/C ASSIST R/C SAILPLANE non-scale models COMPETITION BOAT MILITARY SCALE BOAT HELICOPTER PLEASURE POWER BOAT R/C CAR WORKING VESSEL-UNARMED 154 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACHINECUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $2995 ELECTRA L ITE-ICARUSPANTERAMETEORELECTRICUSWHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 Thus model motors domestic imported could classified using competition brought about such truth labels would benefit us know business making motorslacking other standardthis way Id characterize specify product Id go great length explain potential customers what stuff means use Just think nice would buy kit 100-watt-class motor rather kit 05 motorfor sald earlier Huh Whats 05 Which 05 new unbelievable motor columnist has obtained exclusive information about new motor currently under speculative development Usually-reliable sources have provided photo herein showing some aspects ofthis motor motor claimed unprecedented size power modeling applications incorporate ultra-high-technology including exclusively-developed unipolar electro magnetic principle allows motor run brush However exciting aspect new product its application very rare field magnet material rare earth substance known Unobtalniumclaimed 37 times powerful best cobalt material 4 weight No information available time except motor expected available April 11988 So much another month Please forward comment question SASE please author Bob Kopski 25 West End Dr Lansdale PA 19446 PS current winter project Davey Systems Caliph Photos comments later column Also workshow easily modify new Astro DC DC Super Charger make constant-current charger will remove need frequently readjust con trol knob will allow use car engine running RC Giant Scale/de Vries Continued page 49 Dick Phillips publishing company ViP Aero Publishers Inc PO Box 16103 Color ado Springs CO 80935 latest second book interest U U U U U U U U U I U U U U mu EE__EU_EU U.U SIG QUALITY FUELS * Special Igniters improve cold starting idle characteristics U * High Film Strength Additives increase lubricity provide maximum lean run protection Special Detergents help prevent varnish promote clean burning Rust Preventatives protect expensive engines corrosion * * SIG CHAMPION 2-STROKE FUEL FREIGHT FREE SHIPPING ON ORDERS OVER $1500COLLECT PINT QUART GALLON 55 GAL DRUM 0%Nitnutethane$31$450$1050$19000 5%Nitromethane$35$$25$1250$25800 10%Nitroyyttttane$445$550$14 50$32500 15%Nitromtharte$4$2$1650$38500 25%Nitromethane$495$750S209S$52000 35%Nitromethane$51t 75$249$$66000 SIGPREMIUM4-STROKE FUEL 10%Nitromethane$415$5 50$13 95$29500 15%Nitromethane$425$625$15 95$35900 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending fuel finest quality ingredients available alcohol 995% pure very best grade available nitromethafle use 100 o pure get honest portion based % volume maximum lubrication get perfect 50/50 blend Bakers AA Castor Oil Klotz Techniplate Racing Oil protect expensive engines finest quality fuel can made price Dont take word try some judge yourselfi See dealer first available order direct Call 800-247-5008 toll free orders Latest Catalog $300 __ SIG MANUFACTURING CO Montezuma IA 50171 Prices Sobiect chanee notice Giant Scalers power birds Quadra engines other gas-powered engines similar type Dario Brisighella Mr Quadra author Firewall Forward Quadra Bible Having run text book through old word-processor 20 times down-loaded typesetter having proofread another 10 times think Im safe saying anything want know about care feeding operation maintenance Quadra series engines book expertise youll gain reading will stand good stead operate converted chain-saw leaf-blower other small industrial engines Giant happy event want own copy fully-illustrated book its color cover can order directly us $1295 plus U U U U U U U U p p I I U I U $150 postage handling may obtained also RCM Zenith Aviation Books model dealers patronize Ace K/C Royal Products Dab operates US Quadra 1032 E Manitowoc Oak Creek WI 53154 has book sale might cajoled providing autographed copy Good book says immodestly Plans going forward 1987 version IMAAs Flying Festival Itll much earlier past June 11-14to avoid heat humidity experienced inprevious Festivals 1987 location will absolutely boggle mind Its Converse IN former military auxiliary airfield provides 55 solid acres paved surface Jerry Smith IMAAs official photo PRODUCTS FOR PAIJIU MODELER Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems UnsurpesJ April1987 155 HIGH PERFORMANCE FLAP h1ZI~ m 0 GOt S,bonS FASTER & SAFER ziIIIJ S z Sii0a St rOaR S L Rh t gOt iZZI Siow tot hot pianos doolia tandina peed 5a0itioytO patOmCOOS Use cieci SCiipiSflOO-CctioCtOO Sty tt,oitieonyott switCh 80001 Folly adjuotebie iii aittori easy notaliatlon Onadyburit Cowan corn otete nsiruotioos 5550 i2eOrpicei sand FREE Broctiota Deal moo,, noted xeda/uaIte 9aa Ion1wI 2615 Montana Lawrence Ks 66044