U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible Lots people seem lump perfor mance power together thought thats something shouldnt done Electrics au thor explains use power avail able achieve performance de sire Part 9 can offer has learned personal experiences Ive intent include representative cross sec tion experienceof course accord ing way looking dont find product interest covered still may have some familiarity please write Performance have made frequent refer ence power Part 1 detailed elec tric system viable power source mod els Part 2 detailed motors part power train Part 3 illustrated effects pro peller size power demand placed battery showed part propeller selection essentially de termines power other components electric motor system being appropriate Part 4 discussed batteries used Electric modelsthe 'fuel tanks' energy containersthe models power source Parts 5 6 showed proven ways installing components needed power plane brought us up what flies com plete some rules thumb covering power among other things What performance has common see hear routine references performance power almost interchangeable view use terms same sense common say motor powerful other plane really performs such-and-such motor power performance related same book usual approach general subject area first decide what kind perfor mance want let dictate power needed Power time rate doing work such pulling plane up some climb rate High power will faster low battery size roughly equates battery weight establishes long part Before can go much further need establish what meant performance Whether realized some has already covered earlier parts Remember histograms Part 7 tioned Part 5 would have truly impres really pictures performance sive flight performance could thinking performance part planes skyrocket about 30 sec glide personality 54-in Taylorcraft men- truly impressive performance such model starts ability climb graceful shallow confidence con tinue gradually upward maneuver appropri ately within sight control pilot flying field perhaps pull occasional lazy loop land satisfying number min utes perhaps seven eight after launch plane performance achieve would choose electric system minimum weight could de liver needed power desired time result performance As example another extreme F3E FAI machine heat international battle gold whatever stake requires onboard electric system capable tremendous power delivery short periods timea totally different per spective performance power Taylorcraft example course theres whole range model behavior perfor mance between two examples Thus way thinking Electric flight perforiiiance combination con siderations adding up particular plane flies long Remember battery can deliver its fill empties fast high power demand means motor run time will relatively short converse also true Keep foregoing thoughts distinctions mind plan Electric undertaking Which motor prop battery Over past few months series has covered everything need know suc cessful Electricsexcept motors can what Thats right now Before proceed par ticulars reader may well review some earlier parts series especially Parts 2 3 4 First some preliminary comments past decade first decade Electric has seen surprisingly large sometimes confusing array motors related products come go fact reason delaying particular topic several new products have recently ap peared wanted opportunity try some could include very latest information particular Ive recently bench-run several new cobalts ferrites am now planning new planes put Since Ive just mentioned two kinds motors following offered purposes reducing some contemporary confusion subject Basically two popular motors use 1 cobalt 2 everything else segregation has type magnetic material used motor field magnets Samarium cobalt material produces stronger magnetic fields does barium ferrite example same size weight material As see cobalts inherently powerful others because motors create power Power has mostly suitably chosen battery prop However cobalts offer higher perfor mance better almost way generally better made exam ple brush-commutator area better materials design often al low motor take should always equate give well other words cobalts can often handle power Another nice thing smaller cobalts have heavier armature shafts harder bend rough landing cobalts Ive run tend efficient motors turn given prop same rpm somewhat less electrical input power course always welcome means longer motor run addition seems motors can accommodate greater range battery voltages prop sizes therefore versatile best example versa tility have seen Keller 50/24 SL has optional flux ringsin effect sev eral motor sizes As another bonus cobalts smaller lighter good news course good features cobalts come expense As guideline expect pay about twO five times much cobalt vs other motors same size have flown motors over years very few have cobalts expect will change future because cobalts becoming available fact have several hand just waiting suitable planes warm weather ever also expect continue using lower-cost variety As well can ever forget thousands good flights Ive over years very work able economical motors believe place both everyone wishes vest heavily first testing Electric waters less-skilled learning pilot youre better off having mishap $15 motor anyway Since have just touched sizepart subject handbe advised what follows own way viewing motor Continued page 82 80 Model Aviation taces Electric Elation seen pilots ot tour kinds highly successf at recent Electric Fly L-R Austin Gutman Philadelphia PA Astro Porterfield Keith Shew Ann Arbor Ml Zomby Old-Timer Roland Boucher Irvine CA Electricus powered Sailplane author Bob Kopski Euphoria Two aerobatic model Photo Ellis Grumer Ken Stinsons version Spectra Sport least six versions ot Spectra routine use members Keystone RC Club use six-cell battery packs variety elec trw motors Three RC channels takesrudder elevator prop stop Kopski pic TIGER TAIL 4 Ron Chidgeys latest beat aeries little larger lighter alower retaina honeat flight character tistica ita predeceaaora Eapecially recommended aportaman ad vanced pattern alao good choice turn-around pattern Plana construction hints -$995 WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile seiflocking 3116 width wont cut silicone couplers Pkg 4 clamps $295 82 Model Aviation NEW NEW WING TUBE & SOCKETS 1 4 dia aluminum alloy tubing plug-in wings Included isa pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $8951set ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone expanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing * SpecIal * Both $1395 See Dealer Order Direct Include 75 Per Item f UPS GP C Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202 Air Cleaner Fine Replacement Inserts Cat No 104 PkI2 Inserts Coarse Cat No 204 PkI2 Inserts Fine $225 $225 $195 $195 FITS MOST ENGINES 25 UP size has nothing Electric classes anything sort As have already said current industry chal lenge will eventually shake itself out offering simply purposes estab lishing particular motor battery prop go together some plane achieve desired performance viewing motors according power handling ability will see way dealing motor size result extensive accumulated experi ence over yearssomething has effect attach conservative reasonable operating limits voltage andlor current motor use seems like obvious thing motor capable efficiently handling some range voltage current work load series has used motor power input reference throughout difficulty approach based experience judgment preferences Since established standard cannot readily find applicable data except series rea son have attempted provide exten sive listing hope ones interest will covered possible will add listing future get information case anyone ts wondering yes took single data point given tabulations will find combinations motors props voltages currents amperes viewed information preceding parts should permit mix match avail able hardware choice model achieve performance desire table rest series go gether apply lessons past information installment will have brought together Electric Elation yours Some products listed table now discontinued since still use have included information Some motors quite new have bench data shown may yet have flown operating conditions given ac tual ones would use Most also maximum levels would impose regard important keep mind conservative attitude remind because will no doubt find cases choices differ manufac turers recommendations will tell straight out have plenty experi ence some published combinations have very rapidly ruined brushes commutators should obvious have costly lessons am well aware strong temptation just put bigger prop Ive paid hard cash replace ments too often due blunder data has taken described ear lier series bench data very useful correlates well actual flying results applications Remember Continued page 173 Sleeve Puller- $795 BearIng Puller $895 SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE Wing Span -796 HObbY H0rn Wing Area-564 Sq JVfW SENSOAR glider HOBBY HORN Baclusice HOBBY HORN Kit SENSOAR Glider kit high quality kit Machine cut S sanded parts Select quality balsa spruce Detailed plans written instructions THERMAL SLOPE 55 ELECTRIC POWER VALUE PRICE0a $1500 OLD Tt7R Ki2S butt adS Partsat t{tts P & P Semi-Kits Combined full strtpwoad plan Now Wire Window etc Mut Note may purchased just semi kits planswrite call prices 1936 Buccaneer84$S1 t938 Clipper MN t72-539 1937 Daltaire Sptser100$6t 1940 Rangerat- $27 1939 Mereury72056 5935 Miss Ameriea-84$59 t941 Playboy Jr54-S20 194t Playhoy Sr-60-$46 1030 Power House84-543 1940 Soitptane-78- $74 t940 So LongS0S2t t939 Trenton Terror-72-S32 t939 Zipper54$48 t939 Kords Wokefietd-44- $17 MIDWAY MODEL CO Semi-kilo Combined u/strip 1936 Ftying Quaker84549 1937 Quaker Flosh67530 1937 Long Cebin7t$42 t937 Air Ctdef6t-940 STRUCKS 1940 79 Span 035 Sq .Imin SEMI KIT Plan lncl$3300 N9W IUIDI Combo Pull Kit $6300 SCALE PLANE ORAWINOB 5SO HEINKEL 1-IEtOOD 62 60s $1000 SHtPPtNG AND HANDLING 04 Page CATALOODE Op $000 add $150 $200 PP/tst Class $801 $2000 add $225 copy will aent $2001 $4500 add $300 free-when requested$4501 $7000 add $350 order over $7000 add $400 HOBBY HORN CA Addressees add 6% taX 00hobby specialties** Send 510 Visa/MC#-Exp 15173 Moran Street [Al Check attow up 30 PO Boo 2212 days check clearance Westminster Ca 92603 ICODExact Charges 719 0930311 1 ttdt Cash DntY[Att DPS] 719 0951203 tation motor has some operating cur rent brushes commutators give up can other adverse effects very high currents also Another stop point power limitation examine table carefully will see examples motor used direct drive relatively low voltage high current again relatively high voltage high current speed reducer latter case motor actually handling total power cause relatively high voltage anti high current always some operating power level physical makeup hardware simply cant handle load efficientlyhence power limitation As general rule can handle use ful power given motor used mechanical speed reducer because effect voltage prop choices can used still main taining same safe operating current level will also notice motors same size listed familiar names probably include some may have does know which tough Over years have appeared example several 075s have look-alike labels Unless have enough experience backup data youre probably out luck identifying product part number vintage Regarding Nom Volts column numbers given small ranges small band variation helps en compass battery voltage drop during run down also small difference oc curs between batteries different capacity ampere-hour rating under given load Before finishing information about table please advised have spent much tedious time during 1983 Christ mas holiday gathering listing data believe correct also recognize possibility error something just doesnt look right drop line Whats next Now series has got ten point some readers still have puzzled looks lets stand off reflect whats written far No doubt youve come far youre satisfied Electric works just want get WM 6 Send $100 Cash Check Stamps 32 Page Tabloid size illustrated DISCOUNT Catalog Sent 1st Class Mail COMET COX FLYLINE FOX GOLDBERG GUILLOWS JETCO K&3- PACTRA- PECK POLYMER PERFECT SIG STERLING SULLIVAN TOP FLITE & OTHERS PENN VALLEY HOllY CENTER 937 1 Main St LansialePa 19446 IOISI ess-1a68 308 0550 itor perhaps improve upon what already have going Perhaps example would help dissolve remaining puzzle ment Lets consider some moderate-sized sport Electric application First power system Well start because weve just covered power systems Besides part may represent biggest cash outlay An easy choice something based six-cell 1 2 Ah battery Youll remember popular easy charge Suppose want useful power run about 5 mm use conservative charging techniques described Part 4 means battery will charged about 60-65 ampere-minutes expect get about 90% charge out battery about 55 Am power system required average current about 11 amps nominal S mm motor run would result power motor would average about 75 watts about 68 volts x 11 amps during battery run-down look table youll see plenty lightweight motor/prop combinations could choose Some given bit power could outfitted slightly smaller props speed control could used What can about 75 watts Part 8 know relate cruise motor input power thats start Since sport plane lets pick wing loading about 14 oz/sq ft Using Rule Thumb No 1 can plug numbers see what happens Rule Thumb No 1 Watts ds X Oz/sq ft cruise Therefore 75 14 plane can weigh 75/14 about 5 lb plane would very impressive equation predicts cruising flight plane would no fun fly would large marginal fact hot humid weather youd probably experience powered sink Bystanders would announce glee Electric no good What Divide two little design now beginning shape upa 2-lb 40 oz airplane about 75 watts power reasonable power system battery will weigh Continued page 176 174 Model Aviation j %SCALECHIPMUNK3/8 SCALE STARDUSTER Send $100 catalog 2 16-499-5323 RC Kits Mfg IUIILU LI Canton UEL 706 Easton NE OH 44721 /a STEPHENS ACRO SEE HOT STUFFTMVI DEO-TI PS VHS CASSETTES #S 1 2 CLIP THIS COUPON SEND $5500 check MO GET BOTH VHS TAPES PLUS 1 EA 2 oz HOT STUFF 2 oz SUPER T 3 oz HOT SHOT FREE OFFER GOOD IN US ONLY THRU JUNE 04 PO BOX 836 fl~jpj SIMI CA 93062 7 805 522-0062 NOW THERES QUICK AND EASY WAY OF CLEANING YOUR MODEL CRAFTS Super-K Model Cleaner Removes fuel Residue dirt contact CUTS CLEANING TIME IN HALF Just spray model solvent wipe th soft cloth paper towel SIMPLE AS THAT Leaves craft showcase clean eWont harm Paints Coverings Dries Cleor fast Ulminales Woric cleanIng model SiTong Professional Quality formula Great any Model Craft Boats Rones Helicopters Cleans Gently Protects delicate model DEALERS WANTED DOMESTIC & OVERSEAS WE EXPORT Hurry Have product shelves time Christmas guaranteed top seller Sugg retail $550 per gallon Contact us price structures ordering intormallon Also ask about other Super-K products Model Industly Are Manufacturers & Major Brands DIstrIbutors Model Engines Kits Radios & Accessories Super-K o brand Kings Radio Control Hobbies International 3960 West 16th Ave Hialeah Florida 33012 Phone 305 557-2024 Electrics/Kopski Continued page 174 about 2 oz lls 12 oz average motor application will weigh about 7 oz Add ounce wiring etc power system will weigh 19-20 oz half total planned weight thus conforming Rule Thumb No 3 given last month three-channel radio small servos 250 mAh pack will about 7 oz leaves about 4027 13 oz everything else possible Yep Look photo fo Ken Stinsons ver sion Spectra choice Astro 2107 now discontinued suitable alter native no problem 8 x 4 Top Rite nylon prop six-cell pack three chan nels all-up weight about 38 oz5% below design goal wing 8 50 loading about 137 oz/sq ft Does power portion flight reach 5 mm least doesnt table predict 13-amp 90-watt operating condition combination Sharp arent Yes remember cur rent will drop somewhere around 10-15% flight Thats pretty close gotcha What about total flight time Since Ken flies plane part time glide typical flight 8-10 mm no lift Ken learned fly plane gen erally flies what can honestly called sport fashion have Thats its done Simple huh told earlier no magic involved remember weight very sensitive parameter determining resulting performance Electric Rule Thumb No puts ball park power cruisenot much perfor mance As example above make plane half less weight predicted rule ectric Elation will yours possible something go wrong such arithmetic correct plane still wont fly well Yes Remember rules thumb nominal planes example Kens plane has timehonored 12% flat-bottom section havent tried Im confident 8% fully-symmetrical 500 class airfoil just wouldnt work power level 75 watts could spent power system gross inefficiencysay some unimaginable 3-in prop 25000 rpm Ive seen could have relatively high wing loading sufficiently thin airfoil lots drag such Scale job speed required sustain lift would possible prop reasonable diame ter pitch estimated power Yes f work can make fly prove Electric doesnt work Thats Im writing youre reading MA series Thats folks really though feel has come together promised still say Next month Part 10 will wrap-up review sorts Well touch-up some thin areas look GLASS CLOTHO6 oz Lightest best coserleg glass clothO6 oz/sq yd Satisfied customers in49 States & 24 Countries DAN PARSONS PRODUCTS Dept 15 ft $2080. 30 ft $3660 38 wide Postage pd us & CanImmediate shipment Check MO. MasterCard & visa welcomed 11809 Fulme, NE Albuquerque NM 87111 505 296-2353 CUSTOM FOAM WINGS d TAILS CUSTOM SAILPLANE WINGS d TAILS SPRAY ADHESIVES FIBERGLASS FUSELAGES HI STARTS BALSA d PLYWOOD SEND 50W d IOSASE FOR INFO ESS BOX 437 LEMONT PA 16851 some most-often-asked questions Also Ill try include some photos information outstanding models have Electric Fly events past years construction article will follow sub sequent issue will some series supplements plan latter has fully developed expect sup plements will cover some selected subjects detail Examples could include such things basic electric power system mea surements suitable model designs new products emerge perhaps popular kit conversions Electric Along line have ideas supplements please send sug gestions have questions related previous installments please direct SASE au thor Bob Kopski 25 West End Dr Lan sdale PA 19446 Soaring Aips/Pruss Continued page 88 wondering anyone just might up Wednesday afternoon Helmut Hansruedi just laughed caught reactions Neil myself known about along trip because aeroclub Helmuts home town Bern up one-week holiday Twenty-eight fliers fain176 Model Aviation ~imiiirnP40CARDKIT FULL COLOR EXACT REPRODUCTION ow $500 REMEMBER HOW ~ONLYWELL THEY FLEW Spienial ellen iseladee sespes reosinleg baleen sat re pdoe Seed Ta ee fl Madeis PO Sea 2 mm ReeaISs MI 48886 UNIQUE NOSTALGIC GIFT SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE ON CATALOG48500 MC KENZIE HWY S3OOVIDA OREGON 97488 PUAW DIESELS Englands Finest 049 35 New low low prices Send $100 list Eric Clutton Rt 4 Box 1109C Edmond OK 73034 Very strong two-pieCO wifl Ares 23 lbs USE T-CRAFT 5/ WIRE Fell siac detailed plans PP$2500 Other superb giant-scaic plans tull size S PT-iS Oriadra KIorile$2800 toe- Farosas Mosquito Oaada$2400 80 Farnoan Mosqoito 40-SO Foor-seelsSt 700 Send sash check 0 moneYPlans sort relied UPS POST ords toPAID tornigo orders add 401s airmail desiredSerdIarrase brochures 0111 Taylorcratt plorr oterints
Edition: Model Aviation - 1984/05
Page Numbers: 78, 79, 80, 82, 173, 174, 176
U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible Lots people seem lump perfor mance power together thought thats something shouldnt done Electrics au thor explains use power avail able achieve performance de sire Part 9 can offer has learned personal experiences Ive intent include representative cross sec tion experienceof course accord ing way looking dont find product interest covered still may have some familiarity please write Performance have made frequent refer ence power Part 1 detailed elec tric system viable power source mod els Part 2 detailed motors part power train Part 3 illustrated effects pro peller size power demand placed battery showed part propeller selection essentially de termines power other components electric motor system being appropriate Part 4 discussed batteries used Electric modelsthe 'fuel tanks' energy containersthe models power source Parts 5 6 showed proven ways installing components needed power plane brought us up what flies com plete some rules thumb covering power among other things What performance has common see hear routine references performance power almost interchangeable view use terms same sense common say motor powerful other plane really performs such-and-such motor power performance related same book usual approach general subject area first decide what kind perfor mance want let dictate power needed Power time rate doing work such pulling plane up some climb rate High power will faster low battery size roughly equates battery weight establishes long part Before can go much further need establish what meant performance Whether realized some has already covered earlier parts Remember histograms Part 7 tioned Part 5 would have truly impres really pictures performance sive flight performance could thinking performance part planes skyrocket about 30 sec glide personality 54-in Taylorcraft men- truly impressive performance such model starts ability climb graceful shallow confidence con tinue gradually upward maneuver appropri ately within sight control pilot flying field perhaps pull occasional lazy loop land satisfying number min utes perhaps seven eight after launch plane performance achieve would choose electric system minimum weight could de liver needed power desired time result performance As example another extreme F3E FAI machine heat international battle gold whatever stake requires onboard electric system capable tremendous power delivery short periods timea totally different per spective performance power Taylorcraft example course theres whole range model behavior perfor mance between two examples Thus way thinking Electric flight perforiiiance combination con siderations adding up particular plane flies long Remember battery can deliver its fill empties fast high power demand means motor run time will relatively short converse also true Keep foregoing thoughts distinctions mind plan Electric undertaking Which motor prop battery Over past few months series has covered everything need know suc cessful Electricsexcept motors can what Thats right now Before proceed par ticulars reader may well review some earlier parts series especially Parts 2 3 4 First some preliminary comments past decade first decade Electric has seen surprisingly large sometimes confusing array motors related products come go fact reason delaying particular topic several new products have recently ap peared wanted opportunity try some could include very latest information particular Ive recently bench-run several new cobalts ferrites am now planning new planes put Since Ive just mentioned two kinds motors following offered purposes reducing some contemporary confusion subject Basically two popular motors use 1 cobalt 2 everything else segregation has type magnetic material used motor field magnets Samarium cobalt material produces stronger magnetic fields does barium ferrite example same size weight material As see cobalts inherently powerful others because motors create power Power has mostly suitably chosen battery prop However cobalts offer higher perfor mance better almost way generally better made exam ple brush-commutator area better materials design often al low motor take should always equate give well other words cobalts can often handle power Another nice thing smaller cobalts have heavier armature shafts harder bend rough landing cobalts Ive run tend efficient motors turn given prop same rpm somewhat less electrical input power course always welcome means longer motor run addition seems motors can accommodate greater range battery voltages prop sizes therefore versatile best example versa tility have seen Keller 50/24 SL has optional flux ringsin effect sev eral motor sizes As another bonus cobalts smaller lighter good news course good features cobalts come expense As guideline expect pay about twO five times much cobalt vs other motors same size have flown motors over years very few have cobalts expect will change future because cobalts becoming available fact have several hand just waiting suitable planes warm weather ever also expect continue using lower-cost variety As well can ever forget thousands good flights Ive over years very work able economical motors believe place both everyone wishes vest heavily first testing Electric waters less-skilled learning pilot youre better off having mishap $15 motor anyway Since have just touched sizepart subject handbe advised what follows own way viewing motor Continued page 82 80 Model Aviation taces Electric Elation seen pilots ot tour kinds highly successf at recent Electric Fly L-R Austin Gutman Philadelphia PA Astro Porterfield Keith Shew Ann Arbor Ml Zomby Old-Timer Roland Boucher Irvine CA Electricus powered Sailplane author Bob Kopski Euphoria Two aerobatic model Photo Ellis Grumer Ken Stinsons version Spectra Sport least six versions ot Spectra routine use members Keystone RC Club use six-cell battery packs variety elec trw motors Three RC channels takesrudder elevator prop stop Kopski pic TIGER TAIL 4 Ron Chidgeys latest beat aeries little larger lighter alower retaina honeat flight character tistica ita predeceaaora Eapecially recommended aportaman ad vanced pattern alao good choice turn-around pattern Plana construction hints -$995 WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile seiflocking 3116 width wont cut silicone couplers Pkg 4 clamps $295 82 Model Aviation NEW NEW WING TUBE & SOCKETS 1 4 dia aluminum alloy tubing plug-in wings Included isa pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $8951set ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone expanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing * SpecIal * Both $1395 See Dealer Order Direct Include 75 Per Item f UPS GP C Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202 Air Cleaner Fine Replacement Inserts Cat No 104 PkI2 Inserts Coarse Cat No 204 PkI2 Inserts Fine $225 $225 $195 $195 FITS MOST ENGINES 25 UP size has nothing Electric classes anything sort As have already said current industry chal lenge will eventually shake itself out offering simply purposes estab lishing particular motor battery prop go together some plane achieve desired performance viewing motors according power handling ability will see way dealing motor size result extensive accumulated experi ence over yearssomething has effect attach conservative reasonable operating limits voltage andlor current motor use seems like obvious thing motor capable efficiently handling some range voltage current work load series has used motor power input reference throughout difficulty approach based experience judgment preferences Since established standard cannot readily find applicable data except series rea son have attempted provide exten sive listing hope ones interest will covered possible will add listing future get information case anyone ts wondering yes took single data point given tabulations will find combinations motors props voltages currents amperes viewed information preceding parts should permit mix match avail able hardware choice model achieve performance desire table rest series go gether apply lessons past information installment will have brought together Electric Elation yours Some products listed table now discontinued since still use have included information Some motors quite new have bench data shown may yet have flown operating conditions given ac tual ones would use Most also maximum levels would impose regard important keep mind conservative attitude remind because will no doubt find cases choices differ manufac turers recommendations will tell straight out have plenty experi ence some published combinations have very rapidly ruined brushes commutators should obvious have costly lessons am well aware strong temptation just put bigger prop Ive paid hard cash replace ments too often due blunder data has taken described ear lier series bench data very useful correlates well actual flying results applications Remember Continued page 173 Sleeve Puller- $795 BearIng Puller $895 SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE Wing Span -796 HObbY H0rn Wing Area-564 Sq JVfW SENSOAR glider HOBBY HORN Baclusice HOBBY HORN Kit SENSOAR Glider kit high quality kit Machine cut S sanded parts Select quality balsa spruce Detailed plans written instructions THERMAL SLOPE 55 ELECTRIC POWER VALUE PRICE0a $1500 OLD Tt7R Ki2S butt adS Partsat t{tts P & P Semi-Kits Combined full strtpwoad plan Now Wire Window etc Mut Note may purchased just semi kits planswrite call prices 1936 Buccaneer84$S1 t938 Clipper MN t72-539 1937 Daltaire Sptser100$6t 1940 Rangerat- $27 1939 Mereury72056 5935 Miss Ameriea-84$59 t941 Playboy Jr54-S20 194t Playhoy Sr-60-$46 1030 Power House84-543 1940 Soitptane-78- $74 t940 So LongS0S2t t939 Trenton Terror-72-S32 t939 Zipper54$48 t939 Kords Wokefietd-44- $17 MIDWAY MODEL CO Semi-kilo Combined u/strip 1936 Ftying Quaker84549 1937 Quaker Flosh67530 1937 Long Cebin7t$42 t937 Air Ctdef6t-940 STRUCKS 1940 79 Span 035 Sq .Imin SEMI KIT Plan lncl$3300 N9W IUIDI Combo Pull Kit $6300 SCALE PLANE ORAWINOB 5SO HEINKEL 1-IEtOOD 62 60s $1000 SHtPPtNG AND HANDLING 04 Page CATALOODE Op $000 add $150 $200 PP/tst Class $801 $2000 add $225 copy will aent $2001 $4500 add $300 free-when requested$4501 $7000 add $350 order over $7000 add $400 HOBBY HORN CA Addressees add 6% taX 00hobby specialties** Send 510 Visa/MC#-Exp 15173 Moran Street [Al Check attow up 30 PO Boo 2212 days check clearance Westminster Ca 92603 ICODExact Charges 719 0930311 1 ttdt Cash DntY[Att DPS] 719 0951203 tation motor has some operating cur rent brushes commutators give up can other adverse effects very high currents also Another stop point power limitation examine table carefully will see examples motor used direct drive relatively low voltage high current again relatively high voltage high current speed reducer latter case motor actually handling total power cause relatively high voltage anti high current always some operating power level physical makeup hardware simply cant handle load efficientlyhence power limitation As general rule can handle use ful power given motor used mechanical speed reducer because effect voltage prop choices can used still main taining same safe operating current level will also notice motors same size listed familiar names probably include some may have does know which tough Over years have appeared example several 075s have look-alike labels Unless have enough experience backup data youre probably out luck identifying product part number vintage Regarding Nom Volts column numbers given small ranges small band variation helps en compass battery voltage drop during run down also small difference oc curs between batteries different capacity ampere-hour rating under given load Before finishing information about table please advised have spent much tedious time during 1983 Christ mas holiday gathering listing data believe correct also recognize possibility error something just doesnt look right drop line Whats next Now series has got ten point some readers still have puzzled looks lets stand off reflect whats written far No doubt youve come far youre satisfied Electric works just want get WM 6 Send $100 Cash Check Stamps 32 Page Tabloid size illustrated DISCOUNT Catalog Sent 1st Class Mail COMET COX FLYLINE FOX GOLDBERG GUILLOWS JETCO K&3- PACTRA- PECK POLYMER PERFECT SIG STERLING SULLIVAN TOP FLITE & OTHERS PENN VALLEY HOllY CENTER 937 1 Main St LansialePa 19446 IOISI ess-1a68 308 0550 itor perhaps improve upon what already have going Perhaps example would help dissolve remaining puzzle ment Lets consider some moderate-sized sport Electric application First power system Well start because weve just covered power systems Besides part may represent biggest cash outlay An easy choice something based six-cell 1 2 Ah battery Youll remember popular easy charge Suppose want useful power run about 5 mm use conservative charging techniques described Part 4 means battery will charged about 60-65 ampere-minutes expect get about 90% charge out battery about 55 Am power system required average current about 11 amps nominal S mm motor run would result power motor would average about 75 watts about 68 volts x 11 amps during battery run-down look table youll see plenty lightweight motor/prop combinations could choose Some given bit power could outfitted slightly smaller props speed control could used What can about 75 watts Part 8 know relate cruise motor input power thats start Since sport plane lets pick wing loading about 14 oz/sq ft Using Rule Thumb No 1 can plug numbers see what happens Rule Thumb No 1 Watts ds X Oz/sq ft cruise Therefore 75 14 plane can weigh 75/14 about 5 lb plane would very impressive equation predicts cruising flight plane would no fun fly would large marginal fact hot humid weather youd probably experience powered sink Bystanders would announce glee Electric no good What Divide two little design now beginning shape upa 2-lb 40 oz airplane about 75 watts power reasonable power system battery will weigh Continued page 176 174 Model Aviation j %SCALECHIPMUNK3/8 SCALE STARDUSTER Send $100 catalog 2 16-499-5323 RC Kits Mfg IUIILU LI Canton UEL 706 Easton NE OH 44721 /a STEPHENS ACRO SEE HOT STUFFTMVI DEO-TI PS VHS CASSETTES #S 1 2 CLIP THIS COUPON SEND $5500 check MO GET BOTH VHS TAPES PLUS 1 EA 2 oz HOT STUFF 2 oz SUPER T 3 oz HOT SHOT FREE OFFER GOOD IN US ONLY THRU JUNE 04 PO BOX 836 fl~jpj SIMI CA 93062 7 805 522-0062 NOW THERES QUICK AND EASY WAY OF CLEANING YOUR MODEL CRAFTS Super-K Model Cleaner Removes fuel Residue dirt contact CUTS CLEANING TIME IN HALF Just spray model solvent wipe th soft cloth paper towel SIMPLE AS THAT Leaves craft showcase clean eWont harm Paints Coverings Dries Cleor fast Ulminales Woric cleanIng model SiTong Professional Quality formula Great any Model Craft Boats Rones Helicopters Cleans Gently Protects delicate model DEALERS WANTED DOMESTIC & OVERSEAS WE EXPORT Hurry Have product shelves time Christmas guaranteed top seller Sugg retail $550 per gallon Contact us price structures ordering intormallon Also ask about other Super-K products Model Industly Are Manufacturers & Major Brands DIstrIbutors Model Engines Kits Radios & Accessories Super-K o brand Kings Radio Control Hobbies International 3960 West 16th Ave Hialeah Florida 33012 Phone 305 557-2024 Electrics/Kopski Continued page 174 about 2 oz lls 12 oz average motor application will weigh about 7 oz Add ounce wiring etc power system will weigh 19-20 oz half total planned weight thus conforming Rule Thumb No 3 given last month three-channel radio small servos 250 mAh pack will about 7 oz leaves about 4027 13 oz everything else possible Yep Look photo fo Ken Stinsons ver sion Spectra choice Astro 2107 now discontinued suitable alter native no problem 8 x 4 Top Rite nylon prop six-cell pack three chan nels all-up weight about 38 oz5% below design goal wing 8 50 loading about 137 oz/sq ft Does power portion flight reach 5 mm least doesnt table predict 13-amp 90-watt operating condition combination Sharp arent Yes remember cur rent will drop somewhere around 10-15% flight Thats pretty close gotcha What about total flight time Since Ken flies plane part time glide typical flight 8-10 mm no lift Ken learned fly plane gen erally flies what can honestly called sport fashion have Thats its done Simple huh told earlier no magic involved remember weight very sensitive parameter determining resulting performance Electric Rule Thumb No puts ball park power cruisenot much perfor mance As example above make plane half less weight predicted rule ectric Elation will yours possible something go wrong such arithmetic correct plane still wont fly well Yes Remember rules thumb nominal planes example Kens plane has timehonored 12% flat-bottom section havent tried Im confident 8% fully-symmetrical 500 class airfoil just wouldnt work power level 75 watts could spent power system gross inefficiencysay some unimaginable 3-in prop 25000 rpm Ive seen could have relatively high wing loading sufficiently thin airfoil lots drag such Scale job speed required sustain lift would possible prop reasonable diame ter pitch estimated power Yes f work can make fly prove Electric doesnt work Thats Im writing youre reading MA series Thats folks really though feel has come together promised still say Next month Part 10 will wrap-up review sorts Well touch-up some thin areas look GLASS CLOTHO6 oz Lightest best coserleg glass clothO6 oz/sq yd Satisfied customers in49 States & 24 Countries DAN PARSONS PRODUCTS Dept 15 ft $2080. 30 ft $3660 38 wide Postage pd us & CanImmediate shipment Check MO. MasterCard & visa welcomed 11809 Fulme, NE Albuquerque NM 87111 505 296-2353 CUSTOM FOAM WINGS d TAILS CUSTOM SAILPLANE WINGS d TAILS SPRAY ADHESIVES FIBERGLASS FUSELAGES HI STARTS BALSA d PLYWOOD SEND 50W d IOSASE FOR INFO ESS BOX 437 LEMONT PA 16851 some most-often-asked questions Also Ill try include some photos information outstanding models have Electric Fly events past years construction article will follow sub sequent issue will some series supplements plan latter has fully developed expect sup plements will cover some selected subjects detail Examples could include such things basic electric power system mea surements suitable model designs new products emerge perhaps popular kit conversions Electric Along line have ideas supplements please send sug gestions have questions related previous installments please direct SASE au thor Bob Kopski 25 West End Dr Lan sdale PA 19446 Soaring Aips/Pruss Continued page 88 wondering anyone just might up Wednesday afternoon Helmut Hansruedi just laughed caught reactions Neil myself known about along trip because aeroclub Helmuts home town Bern up one-week holiday Twenty-eight fliers fain176 Model Aviation ~imiiirnP40CARDKIT FULL COLOR EXACT REPRODUCTION ow $500 REMEMBER HOW ~ONLYWELL THEY FLEW Spienial ellen iseladee sespes reosinleg baleen sat re pdoe Seed Ta ee fl Madeis PO Sea 2 mm ReeaISs MI 48886 UNIQUE NOSTALGIC GIFT SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE ON CATALOG48500 MC KENZIE HWY S3OOVIDA OREGON 97488 PUAW DIESELS Englands Finest 049 35 New low low prices Send $100 list Eric Clutton Rt 4 Box 1109C Edmond OK 73034 Very strong two-pieCO wifl Ares 23 lbs USE T-CRAFT 5/ WIRE Fell siac detailed plans PP$2500 Other superb giant-scaic plans tull size S PT-iS Oriadra KIorile$2800 toe- Farosas Mosquito Oaada$2400 80 Farnoan Mosqoito 40-SO Foor-seelsSt 700 Send sash check 0 moneYPlans sort relied UPS POST ords toPAID tornigo orders add 401s airmail desiredSerdIarrase brochures 0111 Taylorcratt plorr oterints
Edition: Model Aviation - 1984/05
Page Numbers: 78, 79, 80, 82, 173, 174, 176
U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible Lots people seem lump perfor mance power together thought thats something shouldnt done Electrics au thor explains use power avail able achieve performance de sire Part 9 can offer has learned personal experiences Ive intent include representative cross sec tion experienceof course accord ing way looking dont find product interest covered still may have some familiarity please write Performance have made frequent refer ence power Part 1 detailed elec tric system viable power source mod els Part 2 detailed motors part power train Part 3 illustrated effects pro peller size power demand placed battery showed part propeller selection essentially de termines power other components electric motor system being appropriate Part 4 discussed batteries used Electric modelsthe 'fuel tanks' energy containersthe models power source Parts 5 6 showed proven ways installing components needed power plane brought us up what flies com plete some rules thumb covering power among other things What performance has common see hear routine references performance power almost interchangeable view use terms same sense common say motor powerful other plane really performs such-and-such motor power performance related same book usual approach general subject area first decide what kind perfor mance want let dictate power needed Power time rate doing work such pulling plane up some climb rate High power will faster low battery size roughly equates battery weight establishes long part Before can go much further need establish what meant performance Whether realized some has already covered earlier parts Remember histograms Part 7 tioned Part 5 would have truly impres really pictures performance sive flight performance could thinking performance part planes skyrocket about 30 sec glide personality 54-in Taylorcraft men- truly impressive performance such model starts ability climb graceful shallow confidence con tinue gradually upward maneuver appropri ately within sight control pilot flying field perhaps pull occasional lazy loop land satisfying number min utes perhaps seven eight after launch plane performance achieve would choose electric system minimum weight could de liver needed power desired time result performance As example another extreme F3E FAI machine heat international battle gold whatever stake requires onboard electric system capable tremendous power delivery short periods timea totally different per spective performance power Taylorcraft example course theres whole range model behavior perfor mance between two examples Thus way thinking Electric flight perforiiiance combination con siderations adding up particular plane flies long Remember battery can deliver its fill empties fast high power demand means motor run time will relatively short converse also true Keep foregoing thoughts distinctions mind plan Electric undertaking Which motor prop battery Over past few months series has covered everything need know suc cessful Electricsexcept motors can what Thats right now Before proceed par ticulars reader may well review some earlier parts series especially Parts 2 3 4 First some preliminary comments past decade first decade Electric has seen surprisingly large sometimes confusing array motors related products come go fact reason delaying particular topic several new products have recently ap peared wanted opportunity try some could include very latest information particular Ive recently bench-run several new cobalts ferrites am now planning new planes put Since Ive just mentioned two kinds motors following offered purposes reducing some contemporary confusion subject Basically two popular motors use 1 cobalt 2 everything else segregation has type magnetic material used motor field magnets Samarium cobalt material produces stronger magnetic fields does barium ferrite example same size weight material As see cobalts inherently powerful others because motors create power Power has mostly suitably chosen battery prop However cobalts offer higher perfor mance better almost way generally better made exam ple brush-commutator area better materials design often al low motor take should always equate give well other words cobalts can often handle power Another nice thing smaller cobalts have heavier armature shafts harder bend rough landing cobalts Ive run tend efficient motors turn given prop same rpm somewhat less electrical input power course always welcome means longer motor run addition seems motors can accommodate greater range battery voltages prop sizes therefore versatile best example versa tility have seen Keller 50/24 SL has optional flux ringsin effect sev eral motor sizes As another bonus cobalts smaller lighter good news course good features cobalts come expense As guideline expect pay about twO five times much cobalt vs other motors same size have flown motors over years very few have cobalts expect will change future because cobalts becoming available fact have several hand just waiting suitable planes warm weather ever also expect continue using lower-cost variety As well can ever forget thousands good flights Ive over years very work able economical motors believe place both everyone wishes vest heavily first testing Electric waters less-skilled learning pilot youre better off having mishap $15 motor anyway Since have just touched sizepart subject handbe advised what follows own way viewing motor Continued page 82 80 Model Aviation taces Electric Elation seen pilots ot tour kinds highly successf at recent Electric Fly L-R Austin Gutman Philadelphia PA Astro Porterfield Keith Shew Ann Arbor Ml Zomby Old-Timer Roland Boucher Irvine CA Electricus powered Sailplane author Bob Kopski Euphoria Two aerobatic model Photo Ellis Grumer Ken Stinsons version Spectra Sport least six versions ot Spectra routine use members Keystone RC Club use six-cell battery packs variety elec trw motors Three RC channels takesrudder elevator prop stop Kopski pic TIGER TAIL 4 Ron Chidgeys latest beat aeries little larger lighter alower retaina honeat flight character tistica ita predeceaaora Eapecially recommended aportaman ad vanced pattern alao good choice turn-around pattern Plana construction hints -$995 WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile seiflocking 3116 width wont cut silicone couplers Pkg 4 clamps $295 82 Model Aviation NEW NEW WING TUBE & SOCKETS 1 4 dia aluminum alloy tubing plug-in wings Included isa pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $8951set ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone expanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing * SpecIal * Both $1395 See Dealer Order Direct Include 75 Per Item f UPS GP C Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202 Air Cleaner Fine Replacement Inserts Cat No 104 PkI2 Inserts Coarse Cat No 204 PkI2 Inserts Fine $225 $225 $195 $195 FITS MOST ENGINES 25 UP size has nothing Electric classes anything sort As have already said current industry chal lenge will eventually shake itself out offering simply purposes estab lishing particular motor battery prop go together some plane achieve desired performance viewing motors according power handling ability will see way dealing motor size result extensive accumulated experi ence over yearssomething has effect attach conservative reasonable operating limits voltage andlor current motor use seems like obvious thing motor capable efficiently handling some range voltage current work load series has used motor power input reference throughout difficulty approach based experience judgment preferences Since established standard cannot readily find applicable data except series rea son have attempted provide exten sive listing hope ones interest will covered possible will add listing future get information case anyone ts wondering yes took single data point given tabulations will find combinations motors props voltages currents amperes viewed information preceding parts should permit mix match avail able hardware choice model achieve performance desire table rest series go gether apply lessons past information installment will have brought together Electric Elation yours Some products listed table now discontinued since still use have included information Some motors quite new have bench data shown may yet have flown operating conditions given ac tual ones would use Most also maximum levels would impose regard important keep mind conservative attitude remind because will no doubt find cases choices differ manufac turers recommendations will tell straight out have plenty experi ence some published combinations have very rapidly ruined brushes commutators should obvious have costly lessons am well aware strong temptation just put bigger prop Ive paid hard cash replace ments too often due blunder data has taken described ear lier series bench data very useful correlates well actual flying results applications Remember Continued page 173 Sleeve Puller- $795 BearIng Puller $895 SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE Wing Span -796 HObbY H0rn Wing Area-564 Sq JVfW SENSOAR glider HOBBY HORN Baclusice HOBBY HORN Kit SENSOAR Glider kit high quality kit Machine cut S sanded parts Select quality balsa spruce Detailed plans written instructions THERMAL SLOPE 55 ELECTRIC POWER VALUE PRICE0a $1500 OLD Tt7R Ki2S butt adS Partsat t{tts P & P Semi-Kits Combined full strtpwoad plan Now Wire Window etc Mut Note may purchased just semi kits planswrite call prices 1936 Buccaneer84$S1 t938 Clipper MN t72-539 1937 Daltaire Sptser100$6t 1940 Rangerat- $27 1939 Mereury72056 5935 Miss Ameriea-84$59 t941 Playboy Jr54-S20 194t Playhoy Sr-60-$46 1030 Power House84-543 1940 Soitptane-78- $74 t940 So LongS0S2t t939 Trenton Terror-72-S32 t939 Zipper54$48 t939 Kords Wokefietd-44- $17 MIDWAY MODEL CO Semi-kilo Combined u/strip 1936 Ftying Quaker84549 1937 Quaker Flosh67530 1937 Long Cebin7t$42 t937 Air Ctdef6t-940 STRUCKS 1940 79 Span 035 Sq .Imin SEMI KIT Plan lncl$3300 N9W IUIDI Combo Pull Kit $6300 SCALE PLANE ORAWINOB 5SO HEINKEL 1-IEtOOD 62 60s $1000 SHtPPtNG AND HANDLING 04 Page CATALOODE Op $000 add $150 $200 PP/tst Class $801 $2000 add $225 copy will aent $2001 $4500 add $300 free-when requested$4501 $7000 add $350 order over $7000 add $400 HOBBY HORN CA Addressees add 6% taX 00hobby specialties** Send 510 Visa/MC#-Exp 15173 Moran Street [Al Check attow up 30 PO Boo 2212 days check clearance Westminster Ca 92603 ICODExact Charges 719 0930311 1 ttdt Cash DntY[Att DPS] 719 0951203 tation motor has some operating cur rent brushes commutators give up can other adverse effects very high currents also Another stop point power limitation examine table carefully will see examples motor used direct drive relatively low voltage high current again relatively high voltage high current speed reducer latter case motor actually handling total power cause relatively high voltage anti high current always some operating power level physical makeup hardware simply cant handle load efficientlyhence power limitation As general rule can handle use ful power given motor used mechanical speed reducer because effect voltage prop choices can used still main taining same safe operating current level will also notice motors same size listed familiar names probably include some may have does know which tough Over years have appeared example several 075s have look-alike labels Unless have enough experience backup data youre probably out luck identifying product part number vintage Regarding Nom Volts column numbers given small ranges small band variation helps en compass battery voltage drop during run down also small difference oc curs between batteries different capacity ampere-hour rating under given load Before finishing information about table please advised have spent much tedious time during 1983 Christ mas holiday gathering listing data believe correct also recognize possibility error something just doesnt look right drop line Whats next Now series has got ten point some readers still have puzzled looks lets stand off reflect whats written far No doubt youve come far youre satisfied Electric works just want get WM 6 Send $100 Cash Check Stamps 32 Page Tabloid size illustrated DISCOUNT Catalog Sent 1st Class Mail COMET COX FLYLINE FOX GOLDBERG GUILLOWS JETCO K&3- PACTRA- PECK POLYMER PERFECT SIG STERLING SULLIVAN TOP FLITE & OTHERS PENN VALLEY HOllY CENTER 937 1 Main St LansialePa 19446 IOISI ess-1a68 308 0550 itor perhaps improve upon what already have going Perhaps example would help dissolve remaining puzzle ment Lets consider some moderate-sized sport Electric application First power system Well start because weve just covered power systems Besides part may represent biggest cash outlay An easy choice something based six-cell 1 2 Ah battery Youll remember popular easy charge Suppose want useful power run about 5 mm use conservative charging techniques described Part 4 means battery will charged about 60-65 ampere-minutes expect get about 90% charge out battery about 55 Am power system required average current about 11 amps nominal S mm motor run would result power motor would average about 75 watts about 68 volts x 11 amps during battery run-down look table youll see plenty lightweight motor/prop combinations could choose Some given bit power could outfitted slightly smaller props speed control could used What can about 75 watts Part 8 know relate cruise motor input power thats start Since sport plane lets pick wing loading about 14 oz/sq ft Using Rule Thumb No 1 can plug numbers see what happens Rule Thumb No 1 Watts ds X Oz/sq ft cruise Therefore 75 14 plane can weigh 75/14 about 5 lb plane would very impressive equation predicts cruising flight plane would no fun fly would large marginal fact hot humid weather youd probably experience powered sink Bystanders would announce glee Electric no good What Divide two little design now beginning shape upa 2-lb 40 oz airplane about 75 watts power reasonable power system battery will weigh Continued page 176 174 Model Aviation j %SCALECHIPMUNK3/8 SCALE STARDUSTER Send $100 catalog 2 16-499-5323 RC Kits Mfg IUIILU LI Canton UEL 706 Easton NE OH 44721 /a STEPHENS ACRO SEE HOT STUFFTMVI DEO-TI PS VHS CASSETTES #S 1 2 CLIP THIS COUPON SEND $5500 check MO GET BOTH VHS TAPES PLUS 1 EA 2 oz HOT STUFF 2 oz SUPER T 3 oz HOT SHOT FREE OFFER GOOD IN US ONLY THRU JUNE 04 PO BOX 836 fl~jpj SIMI CA 93062 7 805 522-0062 NOW THERES QUICK AND EASY WAY OF CLEANING YOUR MODEL CRAFTS Super-K Model Cleaner Removes fuel Residue dirt contact CUTS CLEANING TIME IN HALF Just spray model solvent wipe th soft cloth paper towel SIMPLE AS THAT Leaves craft showcase clean eWont harm Paints Coverings Dries Cleor fast Ulminales Woric cleanIng model SiTong Professional Quality formula Great any Model Craft Boats Rones Helicopters Cleans Gently Protects delicate model DEALERS WANTED DOMESTIC & OVERSEAS WE EXPORT Hurry Have product shelves time Christmas guaranteed top seller Sugg retail $550 per gallon Contact us price structures ordering intormallon Also ask about other Super-K products Model Industly Are Manufacturers & Major Brands DIstrIbutors Model Engines Kits Radios & Accessories Super-K o brand Kings Radio Control Hobbies International 3960 West 16th Ave Hialeah Florida 33012 Phone 305 557-2024 Electrics/Kopski Continued page 174 about 2 oz lls 12 oz average motor application will weigh about 7 oz Add ounce wiring etc power system will weigh 19-20 oz half total planned weight thus conforming Rule Thumb No 3 given last month three-channel radio small servos 250 mAh pack will about 7 oz leaves about 4027 13 oz everything else possible Yep Look photo fo Ken Stinsons ver sion Spectra choice Astro 2107 now discontinued suitable alter native no problem 8 x 4 Top Rite nylon prop six-cell pack three chan nels all-up weight about 38 oz5% below design goal wing 8 50 loading about 137 oz/sq ft Does power portion flight reach 5 mm least doesnt table predict 13-amp 90-watt operating condition combination Sharp arent Yes remember cur rent will drop somewhere around 10-15% flight Thats pretty close gotcha What about total flight time Since Ken flies plane part time glide typical flight 8-10 mm no lift Ken learned fly plane gen erally flies what can honestly called sport fashion have Thats its done Simple huh told earlier no magic involved remember weight very sensitive parameter determining resulting performance Electric Rule Thumb No puts ball park power cruisenot much perfor mance As example above make plane half less weight predicted rule ectric Elation will yours possible something go wrong such arithmetic correct plane still wont fly well Yes Remember rules thumb nominal planes example Kens plane has timehonored 12% flat-bottom section havent tried Im confident 8% fully-symmetrical 500 class airfoil just wouldnt work power level 75 watts could spent power system gross inefficiencysay some unimaginable 3-in prop 25000 rpm Ive seen could have relatively high wing loading sufficiently thin airfoil lots drag such Scale job speed required sustain lift would possible prop reasonable diame ter pitch estimated power Yes f work can make fly prove Electric doesnt work Thats Im writing youre reading MA series Thats folks really though feel has come together promised still say Next month Part 10 will wrap-up review sorts Well touch-up some thin areas look GLASS CLOTHO6 oz Lightest best coserleg glass clothO6 oz/sq yd Satisfied customers in49 States & 24 Countries DAN PARSONS PRODUCTS Dept 15 ft $2080. 30 ft $3660 38 wide Postage pd us & CanImmediate shipment Check MO. MasterCard & visa welcomed 11809 Fulme, NE Albuquerque NM 87111 505 296-2353 CUSTOM FOAM WINGS d TAILS CUSTOM SAILPLANE WINGS d TAILS SPRAY ADHESIVES FIBERGLASS FUSELAGES HI STARTS BALSA d PLYWOOD SEND 50W d IOSASE FOR INFO ESS BOX 437 LEMONT PA 16851 some most-often-asked questions Also Ill try include some photos information outstanding models have Electric Fly events past years construction article will follow sub sequent issue will some series supplements plan latter has fully developed expect sup plements will cover some selected subjects detail Examples could include such things basic electric power system mea surements suitable model designs new products emerge perhaps popular kit conversions Electric Along line have ideas supplements please send sug gestions have questions related previous installments please direct SASE au thor Bob Kopski 25 West End Dr Lan sdale PA 19446 Soaring Aips/Pruss Continued page 88 wondering anyone just might up Wednesday afternoon Helmut Hansruedi just laughed caught reactions Neil myself known about along trip because aeroclub Helmuts home town Bern up one-week holiday Twenty-eight fliers fain176 Model Aviation ~imiiirnP40CARDKIT FULL COLOR EXACT REPRODUCTION ow $500 REMEMBER HOW ~ONLYWELL THEY FLEW Spienial ellen iseladee sespes reosinleg baleen sat re pdoe Seed Ta ee fl Madeis PO Sea 2 mm ReeaISs MI 48886 UNIQUE NOSTALGIC GIFT SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE ON CATALOG48500 MC KENZIE HWY S3OOVIDA OREGON 97488 PUAW DIESELS Englands Finest 049 35 New low low prices Send $100 list Eric Clutton Rt 4 Box 1109C Edmond OK 73034 Very strong two-pieCO wifl Ares 23 lbs USE T-CRAFT 5/ WIRE Fell siac detailed plans PP$2500 Other superb giant-scaic plans tull size S PT-iS Oriadra KIorile$2800 toe- Farosas Mosquito Oaada$2400 80 Farnoan Mosqoito 40-SO Foor-seelsSt 700 Send sash check 0 moneYPlans sort relied UPS POST ords toPAID tornigo orders add 401s airmail desiredSerdIarrase brochures 0111 Taylorcratt plorr oterints
Edition: Model Aviation - 1984/05
Page Numbers: 78, 79, 80, 82, 173, 174, 176
U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible Lots people seem lump perfor mance power together thought thats something shouldnt done Electrics au thor explains use power avail able achieve performance de sire Part 9 can offer has learned personal experiences Ive intent include representative cross sec tion experienceof course accord ing way looking dont find product interest covered still may have some familiarity please write Performance have made frequent refer ence power Part 1 detailed elec tric system viable power source mod els Part 2 detailed motors part power train Part 3 illustrated effects pro peller size power demand placed battery showed part propeller selection essentially de termines power other components electric motor system being appropriate Part 4 discussed batteries used Electric modelsthe 'fuel tanks' energy containersthe models power source Parts 5 6 showed proven ways installing components needed power plane brought us up what flies com plete some rules thumb covering power among other things What performance has common see hear routine references performance power almost interchangeable view use terms same sense common say motor powerful other plane really performs such-and-such motor power performance related same book usual approach general subject area first decide what kind perfor mance want let dictate power needed Power time rate doing work such pulling plane up some climb rate High power will faster low battery size roughly equates battery weight establishes long part Before can go much further need establish what meant performance Whether realized some has already covered earlier parts Remember histograms Part 7 tioned Part 5 would have truly impres really pictures performance sive flight performance could thinking performance part planes skyrocket about 30 sec glide personality 54-in Taylorcraft men- truly impressive performance such model starts ability climb graceful shallow confidence con tinue gradually upward maneuver appropri ately within sight control pilot flying field perhaps pull occasional lazy loop land satisfying number min utes perhaps seven eight after launch plane performance achieve would choose electric system minimum weight could de liver needed power desired time result performance As example another extreme F3E FAI machine heat international battle gold whatever stake requires onboard electric system capable tremendous power delivery short periods timea totally different per spective performance power Taylorcraft example course theres whole range model behavior perfor mance between two examples Thus way thinking Electric flight perforiiiance combination con siderations adding up particular plane flies long Remember battery can deliver its fill empties fast high power demand means motor run time will relatively short converse also true Keep foregoing thoughts distinctions mind plan Electric undertaking Which motor prop battery Over past few months series has covered everything need know suc cessful Electricsexcept motors can what Thats right now Before proceed par ticulars reader may well review some earlier parts series especially Parts 2 3 4 First some preliminary comments past decade first decade Electric has seen surprisingly large sometimes confusing array motors related products come go fact reason delaying particular topic several new products have recently ap peared wanted opportunity try some could include very latest information particular Ive recently bench-run several new cobalts ferrites am now planning new planes put Since Ive just mentioned two kinds motors following offered purposes reducing some contemporary confusion subject Basically two popular motors use 1 cobalt 2 everything else segregation has type magnetic material used motor field magnets Samarium cobalt material produces stronger magnetic fields does barium ferrite example same size weight material As see cobalts inherently powerful others because motors create power Power has mostly suitably chosen battery prop However cobalts offer higher perfor mance better almost way generally better made exam ple brush-commutator area better materials design often al low motor take should always equate give well other words cobalts can often handle power Another nice thing smaller cobalts have heavier armature shafts harder bend rough landing cobalts Ive run tend efficient motors turn given prop same rpm somewhat less electrical input power course always welcome means longer motor run addition seems motors can accommodate greater range battery voltages prop sizes therefore versatile best example versa tility have seen Keller 50/24 SL has optional flux ringsin effect sev eral motor sizes As another bonus cobalts smaller lighter good news course good features cobalts come expense As guideline expect pay about twO five times much cobalt vs other motors same size have flown motors over years very few have cobalts expect will change future because cobalts becoming available fact have several hand just waiting suitable planes warm weather ever also expect continue using lower-cost variety As well can ever forget thousands good flights Ive over years very work able economical motors believe place both everyone wishes vest heavily first testing Electric waters less-skilled learning pilot youre better off having mishap $15 motor anyway Since have just touched sizepart subject handbe advised what follows own way viewing motor Continued page 82 80 Model Aviation taces Electric Elation seen pilots ot tour kinds highly successf at recent Electric Fly L-R Austin Gutman Philadelphia PA Astro Porterfield Keith Shew Ann Arbor Ml Zomby Old-Timer Roland Boucher Irvine CA Electricus powered Sailplane author Bob Kopski Euphoria Two aerobatic model Photo Ellis Grumer Ken Stinsons version Spectra Sport least six versions ot Spectra routine use members Keystone RC Club use six-cell battery packs variety elec trw motors Three RC channels takesrudder elevator prop stop Kopski pic TIGER TAIL 4 Ron Chidgeys latest beat aeries little larger lighter alower retaina honeat flight character tistica ita predeceaaora Eapecially recommended aportaman ad vanced pattern alao good choice turn-around pattern Plana construction hints -$995 WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile seiflocking 3116 width wont cut silicone couplers Pkg 4 clamps $295 82 Model Aviation NEW NEW WING TUBE & SOCKETS 1 4 dia aluminum alloy tubing plug-in wings Included isa pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $8951set ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone expanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing * SpecIal * Both $1395 See Dealer Order Direct Include 75 Per Item f UPS GP C Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202 Air Cleaner Fine Replacement Inserts Cat No 104 PkI2 Inserts Coarse Cat No 204 PkI2 Inserts Fine $225 $225 $195 $195 FITS MOST ENGINES 25 UP size has nothing Electric classes anything sort As have already said current industry chal lenge will eventually shake itself out offering simply purposes estab lishing particular motor battery prop go together some plane achieve desired performance viewing motors according power handling ability will see way dealing motor size result extensive accumulated experi ence over yearssomething has effect attach conservative reasonable operating limits voltage andlor current motor use seems like obvious thing motor capable efficiently handling some range voltage current work load series has used motor power input reference throughout difficulty approach based experience judgment preferences Since established standard cannot readily find applicable data except series rea son have attempted provide exten sive listing hope ones interest will covered possible will add listing future get information case anyone ts wondering yes took single data point given tabulations will find combinations motors props voltages currents amperes viewed information preceding parts should permit mix match avail able hardware choice model achieve performance desire table rest series go gether apply lessons past information installment will have brought together Electric Elation yours Some products listed table now discontinued since still use have included information Some motors quite new have bench data shown may yet have flown operating conditions given ac tual ones would use Most also maximum levels would impose regard important keep mind conservative attitude remind because will no doubt find cases choices differ manufac turers recommendations will tell straight out have plenty experi ence some published combinations have very rapidly ruined brushes commutators should obvious have costly lessons am well aware strong temptation just put bigger prop Ive paid hard cash replace ments too often due blunder data has taken described ear lier series bench data very useful correlates well actual flying results applications Remember Continued page 173 Sleeve Puller- $795 BearIng Puller $895 SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE Wing Span -796 HObbY H0rn Wing Area-564 Sq JVfW SENSOAR glider HOBBY HORN Baclusice HOBBY HORN Kit SENSOAR Glider kit high quality kit Machine cut S sanded parts Select quality balsa spruce Detailed plans written instructions THERMAL SLOPE 55 ELECTRIC POWER VALUE PRICE0a $1500 OLD Tt7R Ki2S butt adS Partsat t{tts P & P Semi-Kits Combined full strtpwoad plan Now Wire Window etc Mut Note may purchased just semi kits planswrite call prices 1936 Buccaneer84$S1 t938 Clipper MN t72-539 1937 Daltaire Sptser100$6t 1940 Rangerat- $27 1939 Mereury72056 5935 Miss Ameriea-84$59 t941 Playboy Jr54-S20 194t Playhoy Sr-60-$46 1030 Power House84-543 1940 Soitptane-78- $74 t940 So LongS0S2t t939 Trenton Terror-72-S32 t939 Zipper54$48 t939 Kords Wokefietd-44- $17 MIDWAY MODEL CO Semi-kilo Combined u/strip 1936 Ftying Quaker84549 1937 Quaker Flosh67530 1937 Long Cebin7t$42 t937 Air Ctdef6t-940 STRUCKS 1940 79 Span 035 Sq .Imin SEMI KIT Plan lncl$3300 N9W IUIDI Combo Pull Kit $6300 SCALE PLANE ORAWINOB 5SO HEINKEL 1-IEtOOD 62 60s $1000 SHtPPtNG AND HANDLING 04 Page CATALOODE Op $000 add $150 $200 PP/tst Class $801 $2000 add $225 copy will aent $2001 $4500 add $300 free-when requested$4501 $7000 add $350 order over $7000 add $400 HOBBY HORN CA Addressees add 6% taX 00hobby specialties** Send 510 Visa/MC#-Exp 15173 Moran Street [Al Check attow up 30 PO Boo 2212 days check clearance Westminster Ca 92603 ICODExact Charges 719 0930311 1 ttdt Cash DntY[Att DPS] 719 0951203 tation motor has some operating cur rent brushes commutators give up can other adverse effects very high currents also Another stop point power limitation examine table carefully will see examples motor used direct drive relatively low voltage high current again relatively high voltage high current speed reducer latter case motor actually handling total power cause relatively high voltage anti high current always some operating power level physical makeup hardware simply cant handle load efficientlyhence power limitation As general rule can handle use ful power given motor used mechanical speed reducer because effect voltage prop choices can used still main taining same safe operating current level will also notice motors same size listed familiar names probably include some may have does know which tough Over years have appeared example several 075s have look-alike labels Unless have enough experience backup data youre probably out luck identifying product part number vintage Regarding Nom Volts column numbers given small ranges small band variation helps en compass battery voltage drop during run down also small difference oc curs between batteries different capacity ampere-hour rating under given load Before finishing information about table please advised have spent much tedious time during 1983 Christ mas holiday gathering listing data believe correct also recognize possibility error something just doesnt look right drop line Whats next Now series has got ten point some readers still have puzzled looks lets stand off reflect whats written far No doubt youve come far youre satisfied Electric works just want get WM 6 Send $100 Cash Check Stamps 32 Page Tabloid size illustrated DISCOUNT Catalog Sent 1st Class Mail COMET COX FLYLINE FOX GOLDBERG GUILLOWS JETCO K&3- PACTRA- PECK POLYMER PERFECT SIG STERLING SULLIVAN TOP FLITE & OTHERS PENN VALLEY HOllY CENTER 937 1 Main St LansialePa 19446 IOISI ess-1a68 308 0550 itor perhaps improve upon what already have going Perhaps example would help dissolve remaining puzzle ment Lets consider some moderate-sized sport Electric application First power system Well start because weve just covered power systems Besides part may represent biggest cash outlay An easy choice something based six-cell 1 2 Ah battery Youll remember popular easy charge Suppose want useful power run about 5 mm use conservative charging techniques described Part 4 means battery will charged about 60-65 ampere-minutes expect get about 90% charge out battery about 55 Am power system required average current about 11 amps nominal S mm motor run would result power motor would average about 75 watts about 68 volts x 11 amps during battery run-down look table youll see plenty lightweight motor/prop combinations could choose Some given bit power could outfitted slightly smaller props speed control could used What can about 75 watts Part 8 know relate cruise motor input power thats start Since sport plane lets pick wing loading about 14 oz/sq ft Using Rule Thumb No 1 can plug numbers see what happens Rule Thumb No 1 Watts ds X Oz/sq ft cruise Therefore 75 14 plane can weigh 75/14 about 5 lb plane would very impressive equation predicts cruising flight plane would no fun fly would large marginal fact hot humid weather youd probably experience powered sink Bystanders would announce glee Electric no good What Divide two little design now beginning shape upa 2-lb 40 oz airplane about 75 watts power reasonable power system battery will weigh Continued page 176 174 Model Aviation j %SCALECHIPMUNK3/8 SCALE STARDUSTER Send $100 catalog 2 16-499-5323 RC Kits Mfg IUIILU LI Canton UEL 706 Easton NE OH 44721 /a STEPHENS ACRO SEE HOT STUFFTMVI DEO-TI PS VHS CASSETTES #S 1 2 CLIP THIS COUPON SEND $5500 check MO GET BOTH VHS TAPES PLUS 1 EA 2 oz HOT STUFF 2 oz SUPER T 3 oz HOT SHOT FREE OFFER GOOD IN US ONLY THRU JUNE 04 PO BOX 836 fl~jpj SIMI CA 93062 7 805 522-0062 NOW THERES QUICK AND EASY WAY OF CLEANING YOUR MODEL CRAFTS Super-K Model Cleaner Removes fuel Residue dirt contact CUTS CLEANING TIME IN HALF Just spray model solvent wipe th soft cloth paper towel SIMPLE AS THAT Leaves craft showcase clean eWont harm Paints Coverings Dries Cleor fast Ulminales Woric cleanIng model SiTong Professional Quality formula Great any Model Craft Boats Rones Helicopters Cleans Gently Protects delicate model DEALERS WANTED DOMESTIC & OVERSEAS WE EXPORT Hurry Have product shelves time Christmas guaranteed top seller Sugg retail $550 per gallon Contact us price structures ordering intormallon Also ask about other Super-K products Model Industly Are Manufacturers & Major Brands DIstrIbutors Model Engines Kits Radios & Accessories Super-K o brand Kings Radio Control Hobbies International 3960 West 16th Ave Hialeah Florida 33012 Phone 305 557-2024 Electrics/Kopski Continued page 174 about 2 oz lls 12 oz average motor application will weigh about 7 oz Add ounce wiring etc power system will weigh 19-20 oz half total planned weight thus conforming Rule Thumb No 3 given last month three-channel radio small servos 250 mAh pack will about 7 oz leaves about 4027 13 oz everything else possible Yep Look photo fo Ken Stinsons ver sion Spectra choice Astro 2107 now discontinued suitable alter native no problem 8 x 4 Top Rite nylon prop six-cell pack three chan nels all-up weight about 38 oz5% below design goal wing 8 50 loading about 137 oz/sq ft Does power portion flight reach 5 mm least doesnt table predict 13-amp 90-watt operating condition combination Sharp arent Yes remember cur rent will drop somewhere around 10-15% flight Thats pretty close gotcha What about total flight time Since Ken flies plane part time glide typical flight 8-10 mm no lift Ken learned fly plane gen erally flies what can honestly called sport fashion have Thats its done Simple huh told earlier no magic involved remember weight very sensitive parameter determining resulting performance Electric Rule Thumb No puts ball park power cruisenot much perfor mance As example above make plane half less weight predicted rule ectric Elation will yours possible something go wrong such arithmetic correct plane still wont fly well Yes Remember rules thumb nominal planes example Kens plane has timehonored 12% flat-bottom section havent tried Im confident 8% fully-symmetrical 500 class airfoil just wouldnt work power level 75 watts could spent power system gross inefficiencysay some unimaginable 3-in prop 25000 rpm Ive seen could have relatively high wing loading sufficiently thin airfoil lots drag such Scale job speed required sustain lift would possible prop reasonable diame ter pitch estimated power Yes f work can make fly prove Electric doesnt work Thats Im writing youre reading MA series Thats folks really though feel has come together promised still say Next month Part 10 will wrap-up review sorts Well touch-up some thin areas look GLASS CLOTHO6 oz Lightest best coserleg glass clothO6 oz/sq yd Satisfied customers in49 States & 24 Countries DAN PARSONS PRODUCTS Dept 15 ft $2080. 30 ft $3660 38 wide Postage pd us & CanImmediate shipment Check MO. MasterCard & visa welcomed 11809 Fulme, NE Albuquerque NM 87111 505 296-2353 CUSTOM FOAM WINGS d TAILS CUSTOM SAILPLANE WINGS d TAILS SPRAY ADHESIVES FIBERGLASS FUSELAGES HI STARTS BALSA d PLYWOOD SEND 50W d IOSASE FOR INFO ESS BOX 437 LEMONT PA 16851 some most-often-asked questions Also Ill try include some photos information outstanding models have Electric Fly events past years construction article will follow sub sequent issue will some series supplements plan latter has fully developed expect sup plements will cover some selected subjects detail Examples could include such things basic electric power system mea surements suitable model designs new products emerge perhaps popular kit conversions Electric Along line have ideas supplements please send sug gestions have questions related previous installments please direct SASE au thor Bob Kopski 25 West End Dr Lan sdale PA 19446 Soaring Aips/Pruss Continued page 88 wondering anyone just might up Wednesday afternoon Helmut Hansruedi just laughed caught reactions Neil myself known about along trip because aeroclub Helmuts home town Bern up one-week holiday Twenty-eight fliers fain176 Model Aviation ~imiiirnP40CARDKIT FULL COLOR EXACT REPRODUCTION ow $500 REMEMBER HOW ~ONLYWELL THEY FLEW Spienial ellen iseladee sespes reosinleg baleen sat re pdoe Seed Ta ee fl Madeis PO Sea 2 mm ReeaISs MI 48886 UNIQUE NOSTALGIC GIFT SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE ON CATALOG48500 MC KENZIE HWY S3OOVIDA OREGON 97488 PUAW DIESELS Englands Finest 049 35 New low low prices Send $100 list Eric Clutton Rt 4 Box 1109C Edmond OK 73034 Very strong two-pieCO wifl Ares 23 lbs USE T-CRAFT 5/ WIRE Fell siac detailed plans PP$2500 Other superb giant-scaic plans tull size S PT-iS Oriadra KIorile$2800 toe- Farosas Mosquito Oaada$2400 80 Farnoan Mosqoito 40-SO Foor-seelsSt 700 Send sash check 0 moneYPlans sort relied UPS POST ords toPAID tornigo orders add 401s airmail desiredSerdIarrase brochures 0111 Taylorcratt plorr oterints
Edition: Model Aviation - 1984/05
Page Numbers: 78, 79, 80, 82, 173, 174, 176
U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible Lots people seem lump perfor mance power together thought thats something shouldnt done Electrics au thor explains use power avail able achieve performance de sire Part 9 can offer has learned personal experiences Ive intent include representative cross sec tion experienceof course accord ing way looking dont find product interest covered still may have some familiarity please write Performance have made frequent refer ence power Part 1 detailed elec tric system viable power source mod els Part 2 detailed motors part power train Part 3 illustrated effects pro peller size power demand placed battery showed part propeller selection essentially de termines power other components electric motor system being appropriate Part 4 discussed batteries used Electric modelsthe 'fuel tanks' energy containersthe models power source Parts 5 6 showed proven ways installing components needed power plane brought us up what flies com plete some rules thumb covering power among other things What performance has common see hear routine references performance power almost interchangeable view use terms same sense common say motor powerful other plane really performs such-and-such motor power performance related same book usual approach general subject area first decide what kind perfor mance want let dictate power needed Power time rate doing work such pulling plane up some climb rate High power will faster low battery size roughly equates battery weight establishes long part Before can go much further need establish what meant performance Whether realized some has already covered earlier parts Remember histograms Part 7 tioned Part 5 would have truly impres really pictures performance sive flight performance could thinking performance part planes skyrocket about 30 sec glide personality 54-in Taylorcraft men- truly impressive performance such model starts ability climb graceful shallow confidence con tinue gradually upward maneuver appropri ately within sight control pilot flying field perhaps pull occasional lazy loop land satisfying number min utes perhaps seven eight after launch plane performance achieve would choose electric system minimum weight could de liver needed power desired time result performance As example another extreme F3E FAI machine heat international battle gold whatever stake requires onboard electric system capable tremendous power delivery short periods timea totally different per spective performance power Taylorcraft example course theres whole range model behavior perfor mance between two examples Thus way thinking Electric flight perforiiiance combination con siderations adding up particular plane flies long Remember battery can deliver its fill empties fast high power demand means motor run time will relatively short converse also true Keep foregoing thoughts distinctions mind plan Electric undertaking Which motor prop battery Over past few months series has covered everything need know suc cessful Electricsexcept motors can what Thats right now Before proceed par ticulars reader may well review some earlier parts series especially Parts 2 3 4 First some preliminary comments past decade first decade Electric has seen surprisingly large sometimes confusing array motors related products come go fact reason delaying particular topic several new products have recently ap peared wanted opportunity try some could include very latest information particular Ive recently bench-run several new cobalts ferrites am now planning new planes put Since Ive just mentioned two kinds motors following offered purposes reducing some contemporary confusion subject Basically two popular motors use 1 cobalt 2 everything else segregation has type magnetic material used motor field magnets Samarium cobalt material produces stronger magnetic fields does barium ferrite example same size weight material As see cobalts inherently powerful others because motors create power Power has mostly suitably chosen battery prop However cobalts offer higher perfor mance better almost way generally better made exam ple brush-commutator area better materials design often al low motor take should always equate give well other words cobalts can often handle power Another nice thing smaller cobalts have heavier armature shafts harder bend rough landing cobalts Ive run tend efficient motors turn given prop same rpm somewhat less electrical input power course always welcome means longer motor run addition seems motors can accommodate greater range battery voltages prop sizes therefore versatile best example versa tility have seen Keller 50/24 SL has optional flux ringsin effect sev eral motor sizes As another bonus cobalts smaller lighter good news course good features cobalts come expense As guideline expect pay about twO five times much cobalt vs other motors same size have flown motors over years very few have cobalts expect will change future because cobalts becoming available fact have several hand just waiting suitable planes warm weather ever also expect continue using lower-cost variety As well can ever forget thousands good flights Ive over years very work able economical motors believe place both everyone wishes vest heavily first testing Electric waters less-skilled learning pilot youre better off having mishap $15 motor anyway Since have just touched sizepart subject handbe advised what follows own way viewing motor Continued page 82 80 Model Aviation taces Electric Elation seen pilots ot tour kinds highly successf at recent Electric Fly L-R Austin Gutman Philadelphia PA Astro Porterfield Keith Shew Ann Arbor Ml Zomby Old-Timer Roland Boucher Irvine CA Electricus powered Sailplane author Bob Kopski Euphoria Two aerobatic model Photo Ellis Grumer Ken Stinsons version Spectra Sport least six versions ot Spectra routine use members Keystone RC Club use six-cell battery packs variety elec trw motors Three RC channels takesrudder elevator prop stop Kopski pic TIGER TAIL 4 Ron Chidgeys latest beat aeries little larger lighter alower retaina honeat flight character tistica ita predeceaaora Eapecially recommended aportaman ad vanced pattern alao good choice turn-around pattern Plana construction hints -$995 WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile seiflocking 3116 width wont cut silicone couplers Pkg 4 clamps $295 82 Model Aviation NEW NEW WING TUBE & SOCKETS 1 4 dia aluminum alloy tubing plug-in wings Included isa pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $8951set ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone expanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing * SpecIal * Both $1395 See Dealer Order Direct Include 75 Per Item f UPS GP C Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202 Air Cleaner Fine Replacement Inserts Cat No 104 PkI2 Inserts Coarse Cat No 204 PkI2 Inserts Fine $225 $225 $195 $195 FITS MOST ENGINES 25 UP size has nothing Electric classes anything sort As have already said current industry chal lenge will eventually shake itself out offering simply purposes estab lishing particular motor battery prop go together some plane achieve desired performance viewing motors according power handling ability will see way dealing motor size result extensive accumulated experi ence over yearssomething has effect attach conservative reasonable operating limits voltage andlor current motor use seems like obvious thing motor capable efficiently handling some range voltage current work load series has used motor power input reference throughout difficulty approach based experience judgment preferences Since established standard cannot readily find applicable data except series rea son have attempted provide exten sive listing hope ones interest will covered possible will add listing future get information case anyone ts wondering yes took single data point given tabulations will find combinations motors props voltages currents amperes viewed information preceding parts should permit mix match avail able hardware choice model achieve performance desire table rest series go gether apply lessons past information installment will have brought together Electric Elation yours Some products listed table now discontinued since still use have included information Some motors quite new have bench data shown may yet have flown operating conditions given ac tual ones would use Most also maximum levels would impose regard important keep mind conservative attitude remind because will no doubt find cases choices differ manufac turers recommendations will tell straight out have plenty experi ence some published combinations have very rapidly ruined brushes commutators should obvious have costly lessons am well aware strong temptation just put bigger prop Ive paid hard cash replace ments too often due blunder data has taken described ear lier series bench data very useful correlates well actual flying results applications Remember Continued page 173 Sleeve Puller- $795 BearIng Puller $895 SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE Wing Span -796 HObbY H0rn Wing Area-564 Sq JVfW SENSOAR glider HOBBY HORN Baclusice HOBBY HORN Kit SENSOAR Glider kit high quality kit Machine cut S sanded parts Select quality balsa spruce Detailed plans written instructions THERMAL SLOPE 55 ELECTRIC POWER VALUE PRICE0a $1500 OLD Tt7R Ki2S butt adS Partsat t{tts P & P Semi-Kits Combined full strtpwoad plan Now Wire Window etc Mut Note may purchased just semi kits planswrite call prices 1936 Buccaneer84$S1 t938 Clipper MN t72-539 1937 Daltaire Sptser100$6t 1940 Rangerat- $27 1939 Mereury72056 5935 Miss Ameriea-84$59 t941 Playboy Jr54-S20 194t Playhoy Sr-60-$46 1030 Power House84-543 1940 Soitptane-78- $74 t940 So LongS0S2t t939 Trenton Terror-72-S32 t939 Zipper54$48 t939 Kords Wokefietd-44- $17 MIDWAY MODEL CO Semi-kilo Combined u/strip 1936 Ftying Quaker84549 1937 Quaker Flosh67530 1937 Long Cebin7t$42 t937 Air Ctdef6t-940 STRUCKS 1940 79 Span 035 Sq .Imin SEMI KIT Plan lncl$3300 N9W IUIDI Combo Pull Kit $6300 SCALE PLANE ORAWINOB 5SO HEINKEL 1-IEtOOD 62 60s $1000 SHtPPtNG AND HANDLING 04 Page CATALOODE Op $000 add $150 $200 PP/tst Class $801 $2000 add $225 copy will aent $2001 $4500 add $300 free-when requested$4501 $7000 add $350 order over $7000 add $400 HOBBY HORN CA Addressees add 6% taX 00hobby specialties** Send 510 Visa/MC#-Exp 15173 Moran Street [Al Check attow up 30 PO Boo 2212 days check clearance Westminster Ca 92603 ICODExact Charges 719 0930311 1 ttdt Cash DntY[Att DPS] 719 0951203 tation motor has some operating cur rent brushes commutators give up can other adverse effects very high currents also Another stop point power limitation examine table carefully will see examples motor used direct drive relatively low voltage high current again relatively high voltage high current speed reducer latter case motor actually handling total power cause relatively high voltage anti high current always some operating power level physical makeup hardware simply cant handle load efficientlyhence power limitation As general rule can handle use ful power given motor used mechanical speed reducer because effect voltage prop choices can used still main taining same safe operating current level will also notice motors same size listed familiar names probably include some may have does know which tough Over years have appeared example several 075s have look-alike labels Unless have enough experience backup data youre probably out luck identifying product part number vintage Regarding Nom Volts column numbers given small ranges small band variation helps en compass battery voltage drop during run down also small difference oc curs between batteries different capacity ampere-hour rating under given load Before finishing information about table please advised have spent much tedious time during 1983 Christ mas holiday gathering listing data believe correct also recognize possibility error something just doesnt look right drop line Whats next Now series has got ten point some readers still have puzzled looks lets stand off reflect whats written far No doubt youve come far youre satisfied Electric works just want get WM 6 Send $100 Cash Check Stamps 32 Page Tabloid size illustrated DISCOUNT Catalog Sent 1st Class Mail COMET COX FLYLINE FOX GOLDBERG GUILLOWS JETCO K&3- PACTRA- PECK POLYMER PERFECT SIG STERLING SULLIVAN TOP FLITE & OTHERS PENN VALLEY HOllY CENTER 937 1 Main St LansialePa 19446 IOISI ess-1a68 308 0550 itor perhaps improve upon what already have going Perhaps example would help dissolve remaining puzzle ment Lets consider some moderate-sized sport Electric application First power system Well start because weve just covered power systems Besides part may represent biggest cash outlay An easy choice something based six-cell 1 2 Ah battery Youll remember popular easy charge Suppose want useful power run about 5 mm use conservative charging techniques described Part 4 means battery will charged about 60-65 ampere-minutes expect get about 90% charge out battery about 55 Am power system required average current about 11 amps nominal S mm motor run would result power motor would average about 75 watts about 68 volts x 11 amps during battery run-down look table youll see plenty lightweight motor/prop combinations could choose Some given bit power could outfitted slightly smaller props speed control could used What can about 75 watts Part 8 know relate cruise motor input power thats start Since sport plane lets pick wing loading about 14 oz/sq ft Using Rule Thumb No 1 can plug numbers see what happens Rule Thumb No 1 Watts ds X Oz/sq ft cruise Therefore 75 14 plane can weigh 75/14 about 5 lb plane would very impressive equation predicts cruising flight plane would no fun fly would large marginal fact hot humid weather youd probably experience powered sink Bystanders would announce glee Electric no good What Divide two little design now beginning shape upa 2-lb 40 oz airplane about 75 watts power reasonable power system battery will weigh Continued page 176 174 Model Aviation j %SCALECHIPMUNK3/8 SCALE STARDUSTER Send $100 catalog 2 16-499-5323 RC Kits Mfg IUIILU LI Canton UEL 706 Easton NE OH 44721 /a STEPHENS ACRO SEE HOT STUFFTMVI DEO-TI PS VHS CASSETTES #S 1 2 CLIP THIS COUPON SEND $5500 check MO GET BOTH VHS TAPES PLUS 1 EA 2 oz HOT STUFF 2 oz SUPER T 3 oz HOT SHOT FREE OFFER GOOD IN US ONLY THRU JUNE 04 PO BOX 836 fl~jpj SIMI CA 93062 7 805 522-0062 NOW THERES QUICK AND EASY WAY OF CLEANING YOUR MODEL CRAFTS Super-K Model Cleaner Removes fuel Residue dirt contact CUTS CLEANING TIME IN HALF Just spray model solvent wipe th soft cloth paper towel SIMPLE AS THAT Leaves craft showcase clean eWont harm Paints Coverings Dries Cleor fast Ulminales Woric cleanIng model SiTong Professional Quality formula Great any Model Craft Boats Rones Helicopters Cleans Gently Protects delicate model DEALERS WANTED DOMESTIC & OVERSEAS WE EXPORT Hurry Have product shelves time Christmas guaranteed top seller Sugg retail $550 per gallon Contact us price structures ordering intormallon Also ask about other Super-K products Model Industly Are Manufacturers & Major Brands DIstrIbutors Model Engines Kits Radios & Accessories Super-K o brand Kings Radio Control Hobbies International 3960 West 16th Ave Hialeah Florida 33012 Phone 305 557-2024 Electrics/Kopski Continued page 174 about 2 oz lls 12 oz average motor application will weigh about 7 oz Add ounce wiring etc power system will weigh 19-20 oz half total planned weight thus conforming Rule Thumb No 3 given last month three-channel radio small servos 250 mAh pack will about 7 oz leaves about 4027 13 oz everything else possible Yep Look photo fo Ken Stinsons ver sion Spectra choice Astro 2107 now discontinued suitable alter native no problem 8 x 4 Top Rite nylon prop six-cell pack three chan nels all-up weight about 38 oz5% below design goal wing 8 50 loading about 137 oz/sq ft Does power portion flight reach 5 mm least doesnt table predict 13-amp 90-watt operating condition combination Sharp arent Yes remember cur rent will drop somewhere around 10-15% flight Thats pretty close gotcha What about total flight time Since Ken flies plane part time glide typical flight 8-10 mm no lift Ken learned fly plane gen erally flies what can honestly called sport fashion have Thats its done Simple huh told earlier no magic involved remember weight very sensitive parameter determining resulting performance Electric Rule Thumb No puts ball park power cruisenot much perfor mance As example above make plane half less weight predicted rule ectric Elation will yours possible something go wrong such arithmetic correct plane still wont fly well Yes Remember rules thumb nominal planes example Kens plane has timehonored 12% flat-bottom section havent tried Im confident 8% fully-symmetrical 500 class airfoil just wouldnt work power level 75 watts could spent power system gross inefficiencysay some unimaginable 3-in prop 25000 rpm Ive seen could have relatively high wing loading sufficiently thin airfoil lots drag such Scale job speed required sustain lift would possible prop reasonable diame ter pitch estimated power Yes f work can make fly prove Electric doesnt work Thats Im writing youre reading MA series Thats folks really though feel has come together promised still say Next month Part 10 will wrap-up review sorts Well touch-up some thin areas look GLASS CLOTHO6 oz Lightest best coserleg glass clothO6 oz/sq yd Satisfied customers in49 States & 24 Countries DAN PARSONS PRODUCTS Dept 15 ft $2080. 30 ft $3660 38 wide Postage pd us & CanImmediate shipment Check MO. MasterCard & visa welcomed 11809 Fulme, NE Albuquerque NM 87111 505 296-2353 CUSTOM FOAM WINGS d TAILS CUSTOM SAILPLANE WINGS d TAILS SPRAY ADHESIVES FIBERGLASS FUSELAGES HI STARTS BALSA d PLYWOOD SEND 50W d IOSASE FOR INFO ESS BOX 437 LEMONT PA 16851 some most-often-asked questions Also Ill try include some photos information outstanding models have Electric Fly events past years construction article will follow sub sequent issue will some series supplements plan latter has fully developed expect sup plements will cover some selected subjects detail Examples could include such things basic electric power system mea surements suitable model designs new products emerge perhaps popular kit conversions Electric Along line have ideas supplements please send sug gestions have questions related previous installments please direct SASE au thor Bob Kopski 25 West End Dr Lan sdale PA 19446 Soaring Aips/Pruss Continued page 88 wondering anyone just might up Wednesday afternoon Helmut Hansruedi just laughed caught reactions Neil myself known about along trip because aeroclub Helmuts home town Bern up one-week holiday Twenty-eight fliers fain176 Model Aviation ~imiiirnP40CARDKIT FULL COLOR EXACT REPRODUCTION ow $500 REMEMBER HOW ~ONLYWELL THEY FLEW Spienial ellen iseladee sespes reosinleg baleen sat re pdoe Seed Ta ee fl Madeis PO Sea 2 mm ReeaISs MI 48886 UNIQUE NOSTALGIC GIFT SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE ON CATALOG48500 MC KENZIE HWY S3OOVIDA OREGON 97488 PUAW DIESELS Englands Finest 049 35 New low low prices Send $100 list Eric Clutton Rt 4 Box 1109C Edmond OK 73034 Very strong two-pieCO wifl Ares 23 lbs USE T-CRAFT 5/ WIRE Fell siac detailed plans PP$2500 Other superb giant-scaic plans tull size S PT-iS Oriadra KIorile$2800 toe- Farosas Mosquito Oaada$2400 80 Farnoan Mosqoito 40-SO Foor-seelsSt 700 Send sash check 0 moneYPlans sort relied UPS POST ords toPAID tornigo orders add 401s airmail desiredSerdIarrase brochures 0111 Taylorcratt plorr oterints
Edition: Model Aviation - 1984/05
Page Numbers: 78, 79, 80, 82, 173, 174, 176
U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible Lots people seem lump perfor mance power together thought thats something shouldnt done Electrics au thor explains use power avail able achieve performance de sire Part 9 can offer has learned personal experiences Ive intent include representative cross sec tion experienceof course accord ing way looking dont find product interest covered still may have some familiarity please write Performance have made frequent refer ence power Part 1 detailed elec tric system viable power source mod els Part 2 detailed motors part power train Part 3 illustrated effects pro peller size power demand placed battery showed part propeller selection essentially de termines power other components electric motor system being appropriate Part 4 discussed batteries used Electric modelsthe 'fuel tanks' energy containersthe models power source Parts 5 6 showed proven ways installing components needed power plane brought us up what flies com plete some rules thumb covering power among other things What performance has common see hear routine references performance power almost interchangeable view use terms same sense common say motor powerful other plane really performs such-and-such motor power performance related same book usual approach general subject area first decide what kind perfor mance want let dictate power needed Power time rate doing work such pulling plane up some climb rate High power will faster low battery size roughly equates battery weight establishes long part Before can go much further need establish what meant performance Whether realized some has already covered earlier parts Remember histograms Part 7 tioned Part 5 would have truly impres really pictures performance sive flight performance could thinking performance part planes skyrocket about 30 sec glide personality 54-in Taylorcraft men- truly impressive performance such model starts ability climb graceful shallow confidence con tinue gradually upward maneuver appropri ately within sight control pilot flying field perhaps pull occasional lazy loop land satisfying number min utes perhaps seven eight after launch plane performance achieve would choose electric system minimum weight could de liver needed power desired time result performance As example another extreme F3E FAI machine heat international battle gold whatever stake requires onboard electric system capable tremendous power delivery short periods timea totally different per spective performance power Taylorcraft example course theres whole range model behavior perfor mance between two examples Thus way thinking Electric flight perforiiiance combination con siderations adding up particular plane flies long Remember battery can deliver its fill empties fast high power demand means motor run time will relatively short converse also true Keep foregoing thoughts distinctions mind plan Electric undertaking Which motor prop battery Over past few months series has covered everything need know suc cessful Electricsexcept motors can what Thats right now Before proceed par ticulars reader may well review some earlier parts series especially Parts 2 3 4 First some preliminary comments past decade first decade Electric has seen surprisingly large sometimes confusing array motors related products come go fact reason delaying particular topic several new products have recently ap peared wanted opportunity try some could include very latest information particular Ive recently bench-run several new cobalts ferrites am now planning new planes put Since Ive just mentioned two kinds motors following offered purposes reducing some contemporary confusion subject Basically two popular motors use 1 cobalt 2 everything else segregation has type magnetic material used motor field magnets Samarium cobalt material produces stronger magnetic fields does barium ferrite example same size weight material As see cobalts inherently powerful others because motors create power Power has mostly suitably chosen battery prop However cobalts offer higher perfor mance better almost way generally better made exam ple brush-commutator area better materials design often al low motor take should always equate give well other words cobalts can often handle power Another nice thing smaller cobalts have heavier armature shafts harder bend rough landing cobalts Ive run tend efficient motors turn given prop same rpm somewhat less electrical input power course always welcome means longer motor run addition seems motors can accommodate greater range battery voltages prop sizes therefore versatile best example versa tility have seen Keller 50/24 SL has optional flux ringsin effect sev eral motor sizes As another bonus cobalts smaller lighter good news course good features cobalts come expense As guideline expect pay about twO five times much cobalt vs other motors same size have flown motors over years very few have cobalts expect will change future because cobalts becoming available fact have several hand just waiting suitable planes warm weather ever also expect continue using lower-cost variety As well can ever forget thousands good flights Ive over years very work able economical motors believe place both everyone wishes vest heavily first testing Electric waters less-skilled learning pilot youre better off having mishap $15 motor anyway Since have just touched sizepart subject handbe advised what follows own way viewing motor Continued page 82 80 Model Aviation taces Electric Elation seen pilots ot tour kinds highly successf at recent Electric Fly L-R Austin Gutman Philadelphia PA Astro Porterfield Keith Shew Ann Arbor Ml Zomby Old-Timer Roland Boucher Irvine CA Electricus powered Sailplane author Bob Kopski Euphoria Two aerobatic model Photo Ellis Grumer Ken Stinsons version Spectra Sport least six versions ot Spectra routine use members Keystone RC Club use six-cell battery packs variety elec trw motors Three RC channels takesrudder elevator prop stop Kopski pic TIGER TAIL 4 Ron Chidgeys latest beat aeries little larger lighter alower retaina honeat flight character tistica ita predeceaaora Eapecially recommended aportaman ad vanced pattern alao good choice turn-around pattern Plana construction hints -$995 WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile seiflocking 3116 width wont cut silicone couplers Pkg 4 clamps $295 82 Model Aviation NEW NEW WING TUBE & SOCKETS 1 4 dia aluminum alloy tubing plug-in wings Included isa pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $8951set ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone expanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing * SpecIal * Both $1395 See Dealer Order Direct Include 75 Per Item f UPS GP C Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202 Air Cleaner Fine Replacement Inserts Cat No 104 PkI2 Inserts Coarse Cat No 204 PkI2 Inserts Fine $225 $225 $195 $195 FITS MOST ENGINES 25 UP size has nothing Electric classes anything sort As have already said current industry chal lenge will eventually shake itself out offering simply purposes estab lishing particular motor battery prop go together some plane achieve desired performance viewing motors according power handling ability will see way dealing motor size result extensive accumulated experi ence over yearssomething has effect attach conservative reasonable operating limits voltage andlor current motor use seems like obvious thing motor capable efficiently handling some range voltage current work load series has used motor power input reference throughout difficulty approach based experience judgment preferences Since established standard cannot readily find applicable data except series rea son have attempted provide exten sive listing hope ones interest will covered possible will add listing future get information case anyone ts wondering yes took single data point given tabulations will find combinations motors props voltages currents amperes viewed information preceding parts should permit mix match avail able hardware choice model achieve performance desire table rest series go gether apply lessons past information installment will have brought together Electric Elation yours Some products listed table now discontinued since still use have included information Some motors quite new have bench data shown may yet have flown operating conditions given ac tual ones would use Most also maximum levels would impose regard important keep mind conservative attitude remind because will no doubt find cases choices differ manufac turers recommendations will tell straight out have plenty experi ence some published combinations have very rapidly ruined brushes commutators should obvious have costly lessons am well aware strong temptation just put bigger prop Ive paid hard cash replace ments too often due blunder data has taken described ear lier series bench data very useful correlates well actual flying results applications Remember Continued page 173 Sleeve Puller- $795 BearIng Puller $895 SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE Wing Span -796 HObbY H0rn Wing Area-564 Sq JVfW SENSOAR glider HOBBY HORN Baclusice HOBBY HORN Kit SENSOAR Glider kit high quality kit Machine cut S sanded parts Select quality balsa spruce Detailed plans written instructions THERMAL SLOPE 55 ELECTRIC POWER VALUE PRICE0a $1500 OLD Tt7R Ki2S butt adS Partsat t{tts P & P Semi-Kits Combined full strtpwoad plan Now Wire Window etc Mut Note may purchased just semi kits planswrite call prices 1936 Buccaneer84$S1 t938 Clipper MN t72-539 1937 Daltaire Sptser100$6t 1940 Rangerat- $27 1939 Mereury72056 5935 Miss Ameriea-84$59 t941 Playboy Jr54-S20 194t Playhoy Sr-60-$46 1030 Power House84-543 1940 Soitptane-78- $74 t940 So LongS0S2t t939 Trenton Terror-72-S32 t939 Zipper54$48 t939 Kords Wokefietd-44- $17 MIDWAY MODEL CO Semi-kilo Combined u/strip 1936 Ftying Quaker84549 1937 Quaker Flosh67530 1937 Long Cebin7t$42 t937 Air Ctdef6t-940 STRUCKS 1940 79 Span 035 Sq .Imin SEMI KIT Plan lncl$3300 N9W IUIDI Combo Pull Kit $6300 SCALE PLANE ORAWINOB 5SO HEINKEL 1-IEtOOD 62 60s $1000 SHtPPtNG AND HANDLING 04 Page CATALOODE Op $000 add $150 $200 PP/tst Class $801 $2000 add $225 copy will aent $2001 $4500 add $300 free-when requested$4501 $7000 add $350 order over $7000 add $400 HOBBY HORN CA Addressees add 6% taX 00hobby specialties** Send 510 Visa/MC#-Exp 15173 Moran Street [Al Check attow up 30 PO Boo 2212 days check clearance Westminster Ca 92603 ICODExact Charges 719 0930311 1 ttdt Cash DntY[Att DPS] 719 0951203 tation motor has some operating cur rent brushes commutators give up can other adverse effects very high currents also Another stop point power limitation examine table carefully will see examples motor used direct drive relatively low voltage high current again relatively high voltage high current speed reducer latter case motor actually handling total power cause relatively high voltage anti high current always some operating power level physical makeup hardware simply cant handle load efficientlyhence power limitation As general rule can handle use ful power given motor used mechanical speed reducer because effect voltage prop choices can used still main taining same safe operating current level will also notice motors same size listed familiar names probably include some may have does know which tough Over years have appeared example several 075s have look-alike labels Unless have enough experience backup data youre probably out luck identifying product part number vintage Regarding Nom Volts column numbers given small ranges small band variation helps en compass battery voltage drop during run down also small difference oc curs between batteries different capacity ampere-hour rating under given load Before finishing information about table please advised have spent much tedious time during 1983 Christ mas holiday gathering listing data believe correct also recognize possibility error something just doesnt look right drop line Whats next Now series has got ten point some readers still have puzzled looks lets stand off reflect whats written far No doubt youve come far youre satisfied Electric works just want get WM 6 Send $100 Cash Check Stamps 32 Page Tabloid size illustrated DISCOUNT Catalog Sent 1st Class Mail COMET COX FLYLINE FOX GOLDBERG GUILLOWS JETCO K&3- PACTRA- PECK POLYMER PERFECT SIG STERLING SULLIVAN TOP FLITE & OTHERS PENN VALLEY HOllY CENTER 937 1 Main St LansialePa 19446 IOISI ess-1a68 308 0550 itor perhaps improve upon what already have going Perhaps example would help dissolve remaining puzzle ment Lets consider some moderate-sized sport Electric application First power system Well start because weve just covered power systems Besides part may represent biggest cash outlay An easy choice something based six-cell 1 2 Ah battery Youll remember popular easy charge Suppose want useful power run about 5 mm use conservative charging techniques described Part 4 means battery will charged about 60-65 ampere-minutes expect get about 90% charge out battery about 55 Am power system required average current about 11 amps nominal S mm motor run would result power motor would average about 75 watts about 68 volts x 11 amps during battery run-down look table youll see plenty lightweight motor/prop combinations could choose Some given bit power could outfitted slightly smaller props speed control could used What can about 75 watts Part 8 know relate cruise motor input power thats start Since sport plane lets pick wing loading about 14 oz/sq ft Using Rule Thumb No 1 can plug numbers see what happens Rule Thumb No 1 Watts ds X Oz/sq ft cruise Therefore 75 14 plane can weigh 75/14 about 5 lb plane would very impressive equation predicts cruising flight plane would no fun fly would large marginal fact hot humid weather youd probably experience powered sink Bystanders would announce glee Electric no good What Divide two little design now beginning shape upa 2-lb 40 oz airplane about 75 watts power reasonable power system battery will weigh Continued page 176 174 Model Aviation j %SCALECHIPMUNK3/8 SCALE STARDUSTER Send $100 catalog 2 16-499-5323 RC Kits Mfg IUIILU LI Canton UEL 706 Easton NE OH 44721 /a STEPHENS ACRO SEE HOT STUFFTMVI DEO-TI PS VHS CASSETTES #S 1 2 CLIP THIS COUPON SEND $5500 check MO GET BOTH VHS TAPES PLUS 1 EA 2 oz HOT STUFF 2 oz SUPER T 3 oz HOT SHOT FREE OFFER GOOD IN US ONLY THRU JUNE 04 PO BOX 836 fl~jpj SIMI CA 93062 7 805 522-0062 NOW THERES QUICK AND EASY WAY OF CLEANING YOUR MODEL CRAFTS Super-K Model Cleaner Removes fuel Residue dirt contact CUTS CLEANING TIME IN HALF Just spray model solvent wipe th soft cloth paper towel SIMPLE AS THAT Leaves craft showcase clean eWont harm Paints Coverings Dries Cleor fast Ulminales Woric cleanIng model SiTong Professional Quality formula Great any Model Craft Boats Rones Helicopters Cleans Gently Protects delicate model DEALERS WANTED DOMESTIC & OVERSEAS WE EXPORT Hurry Have product shelves time Christmas guaranteed top seller Sugg retail $550 per gallon Contact us price structures ordering intormallon Also ask about other Super-K products Model Industly Are Manufacturers & Major Brands DIstrIbutors Model Engines Kits Radios & Accessories Super-K o brand Kings Radio Control Hobbies International 3960 West 16th Ave Hialeah Florida 33012 Phone 305 557-2024 Electrics/Kopski Continued page 174 about 2 oz lls 12 oz average motor application will weigh about 7 oz Add ounce wiring etc power system will weigh 19-20 oz half total planned weight thus conforming Rule Thumb No 3 given last month three-channel radio small servos 250 mAh pack will about 7 oz leaves about 4027 13 oz everything else possible Yep Look photo fo Ken Stinsons ver sion Spectra choice Astro 2107 now discontinued suitable alter native no problem 8 x 4 Top Rite nylon prop six-cell pack three chan nels all-up weight about 38 oz5% below design goal wing 8 50 loading about 137 oz/sq ft Does power portion flight reach 5 mm least doesnt table predict 13-amp 90-watt operating condition combination Sharp arent Yes remember cur rent will drop somewhere around 10-15% flight Thats pretty close gotcha What about total flight time Since Ken flies plane part time glide typical flight 8-10 mm no lift Ken learned fly plane gen erally flies what can honestly called sport fashion have Thats its done Simple huh told earlier no magic involved remember weight very sensitive parameter determining resulting performance Electric Rule Thumb No puts ball park power cruisenot much perfor mance As example above make plane half less weight predicted rule ectric Elation will yours possible something go wrong such arithmetic correct plane still wont fly well Yes Remember rules thumb nominal planes example Kens plane has timehonored 12% flat-bottom section havent tried Im confident 8% fully-symmetrical 500 class airfoil just wouldnt work power level 75 watts could spent power system gross inefficiencysay some unimaginable 3-in prop 25000 rpm Ive seen could have relatively high wing loading sufficiently thin airfoil lots drag such Scale job speed required sustain lift would possible prop reasonable diame ter pitch estimated power Yes f work can make fly prove Electric doesnt work Thats Im writing youre reading MA series Thats folks really though feel has come together promised still say Next month Part 10 will wrap-up review sorts Well touch-up some thin areas look GLASS CLOTHO6 oz Lightest best coserleg glass clothO6 oz/sq yd Satisfied customers in49 States & 24 Countries DAN PARSONS PRODUCTS Dept 15 ft $2080. 30 ft $3660 38 wide Postage pd us & CanImmediate shipment Check MO. MasterCard & visa welcomed 11809 Fulme, NE Albuquerque NM 87111 505 296-2353 CUSTOM FOAM WINGS d TAILS CUSTOM SAILPLANE WINGS d TAILS SPRAY ADHESIVES FIBERGLASS FUSELAGES HI STARTS BALSA d PLYWOOD SEND 50W d IOSASE FOR INFO ESS BOX 437 LEMONT PA 16851 some most-often-asked questions Also Ill try include some photos information outstanding models have Electric Fly events past years construction article will follow sub sequent issue will some series supplements plan latter has fully developed expect sup plements will cover some selected subjects detail Examples could include such things basic electric power system mea surements suitable model designs new products emerge perhaps popular kit conversions Electric Along line have ideas supplements please send sug gestions have questions related previous installments please direct SASE au thor Bob Kopski 25 West End Dr Lan sdale PA 19446 Soaring Aips/Pruss Continued page 88 wondering anyone just might up Wednesday afternoon Helmut Hansruedi just laughed caught reactions Neil myself known about along trip because aeroclub Helmuts home town Bern up one-week holiday Twenty-eight fliers fain176 Model Aviation ~imiiirnP40CARDKIT FULL COLOR EXACT REPRODUCTION ow $500 REMEMBER HOW ~ONLYWELL THEY FLEW Spienial ellen iseladee sespes reosinleg baleen sat re pdoe Seed Ta ee fl Madeis PO Sea 2 mm ReeaISs MI 48886 UNIQUE NOSTALGIC GIFT SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE ON CATALOG48500 MC KENZIE HWY S3OOVIDA OREGON 97488 PUAW DIESELS Englands Finest 049 35 New low low prices Send $100 list Eric Clutton Rt 4 Box 1109C Edmond OK 73034 Very strong two-pieCO wifl Ares 23 lbs USE T-CRAFT 5/ WIRE Fell siac detailed plans PP$2500 Other superb giant-scaic plans tull size S PT-iS Oriadra KIorile$2800 toe- Farosas Mosquito Oaada$2400 80 Farnoan Mosqoito 40-SO Foor-seelsSt 700 Send sash check 0 moneYPlans sort relied UPS POST ords toPAID tornigo orders add 401s airmail desiredSerdIarrase brochures 0111 Taylorcratt plorr oterints
Edition: Model Aviation - 1984/05
Page Numbers: 78, 79, 80, 82, 173, 174, 176
U THIS INSTALLMENT ON planes fly ing will attempt present something has missing up now much power goes what motor prop bat tery combine suitable model installment will brings series together long promised taken previous parts should assured first-time continuing Electric successwith under standing Thats what call Electric Elation time let repeat something said beginning often difficult impossible have first-hand familiarity everything means best ne picture anove ny uus urumer ana tne smaller below Dy Hera Durks Show parts ot slight line recent electric Fly events put Keystone RC Club large variety highly successful Electrics speaks well form power Only sounds fun audible Lots people seem lump perfor mance power together thought thats something shouldnt done Electrics au thor explains use power avail able achieve performance de sire Part 9 can offer has learned personal experiences Ive intent include representative cross sec tion experienceof course accord ing way looking dont find product interest covered still may have some familiarity please write Performance have made frequent refer ence power Part 1 detailed elec tric system viable power source mod els Part 2 detailed motors part power train Part 3 illustrated effects pro peller size power demand placed battery showed part propeller selection essentially de termines power other components electric motor system being appropriate Part 4 discussed batteries used Electric modelsthe 'fuel tanks' energy containersthe models power source Parts 5 6 showed proven ways installing components needed power plane brought us up what flies com plete some rules thumb covering power among other things What performance has common see hear routine references performance power almost interchangeable view use terms same sense common say motor powerful other plane really performs such-and-such motor power performance related same book usual approach general subject area first decide what kind perfor mance want let dictate power needed Power time rate doing work such pulling plane up some climb rate High power will faster low battery size roughly equates battery weight establishes long part Before can go much further need establish what meant performance Whether realized some has already covered earlier parts Remember histograms Part 7 tioned Part 5 would have truly impres really pictures performance sive flight performance could thinking performance part planes skyrocket about 30 sec glide personality 54-in Taylorcraft men- truly impressive performance such model starts ability climb graceful shallow confidence con tinue gradually upward maneuver appropri ately within sight control pilot flying field perhaps pull occasional lazy loop land satisfying number min utes perhaps seven eight after launch plane performance achieve would choose electric system minimum weight could de liver needed power desired time result performance As example another extreme F3E FAI machine heat international battle gold whatever stake requires onboard electric system capable tremendous power delivery short periods timea totally different per spective performance power Taylorcraft example course theres whole range model behavior perfor mance between two examples Thus way thinking Electric flight perforiiiance combination con siderations adding up particular plane flies long Remember battery can deliver its fill empties fast high power demand means motor run time will relatively short converse also true Keep foregoing thoughts distinctions mind plan Electric undertaking Which motor prop battery Over past few months series has covered everything need know suc cessful Electricsexcept motors can what Thats right now Before proceed par ticulars reader may well review some earlier parts series especially Parts 2 3 4 First some preliminary comments past decade first decade Electric has seen surprisingly large sometimes confusing array motors related products come go fact reason delaying particular topic several new products have recently ap peared wanted opportunity try some could include very latest information particular Ive recently bench-run several new cobalts ferrites am now planning new planes put Since Ive just mentioned two kinds motors following offered purposes reducing some contemporary confusion subject Basically two popular motors use 1 cobalt 2 everything else segregation has type magnetic material used motor field magnets Samarium cobalt material produces stronger magnetic fields does barium ferrite example same size weight material As see cobalts inherently powerful others because motors create power Power has mostly suitably chosen battery prop However cobalts offer higher perfor mance better almost way generally better made exam ple brush-commutator area better materials design often al low motor take should always equate give well other words cobalts can often handle power Another nice thing smaller cobalts have heavier armature shafts harder bend rough landing cobalts Ive run tend efficient motors turn given prop same rpm somewhat less electrical input power course always welcome means longer motor run addition seems motors can accommodate greater range battery voltages prop sizes therefore versatile best example versa tility have seen Keller 50/24 SL has optional flux ringsin effect sev eral motor sizes As another bonus cobalts smaller lighter good news course good features cobalts come expense As guideline expect pay about twO five times much cobalt vs other motors same size have flown motors over years very few have cobalts expect will change future because cobalts becoming available fact have several hand just waiting suitable planes warm weather ever also expect continue using lower-cost variety As well can ever forget thousands good flights Ive over years very work able economical motors believe place both everyone wishes vest heavily first testing Electric waters less-skilled learning pilot youre better off having mishap $15 motor anyway Since have just touched sizepart subject handbe advised what follows own way viewing motor Continued page 82 80 Model Aviation taces Electric Elation seen pilots ot tour kinds highly successf at recent Electric Fly L-R Austin Gutman Philadelphia PA Astro Porterfield Keith Shew Ann Arbor Ml Zomby Old-Timer Roland Boucher Irvine CA Electricus powered Sailplane author Bob Kopski Euphoria Two aerobatic model Photo Ellis Grumer Ken Stinsons version Spectra Sport least six versions ot Spectra routine use members Keystone RC Club use six-cell battery packs variety elec trw motors Three RC channels takesrudder elevator prop stop Kopski pic TIGER TAIL 4 Ron Chidgeys latest beat aeries little larger lighter alower retaina honeat flight character tistica ita predeceaaora Eapecially recommended aportaman ad vanced pattern alao good choice turn-around pattern Plana construction hints -$995 WELLER 3 BLADE PROP very stiff molded fiberglas propellor England Its efficient design allows substantial reduction noise level actually improving per formance $2000 NEW NEW CLAMP IT FOREVER STAINLESS STEEL PIPE CLAMPS Light strong Low-profile seiflocking 3116 width wont cut silicone couplers Pkg 4 clamps $295 82 Model Aviation NEW NEW WING TUBE & SOCKETS 1 4 dia aluminum alloy tubing plug-in wings Included isa pair special slip-fit phenolic sockets build wing-structure 2024 alum tube 24 long socket 12 long $8951set ENGINE SLEEVE & BEARING PULLER Pull tight sleeves bearings easily damage Cone cone expanding brass ring grips sleeve bearing ID new 60s 17MM rear bearing * SpecIal * Both $1395 See Dealer Order Direct Include 75 Per Item f UPS GP C Gator RIC Products 3713 Pompano Dr Pensacola FL 32514 Phone AC 904 476-8639 * * Long Engine Life * * Use BRU LINE Air Cleaner Completely Fuel Proof Nylon Rubber Parts Cat No 102 Air Cleaner Coarse Cat No 202 Air Cleaner Fine Replacement Inserts Cat No 104 PkI2 Inserts Coarse Cat No 204 PkI2 Inserts Fine $225 $225 $195 $195 FITS MOST ENGINES 25 UP size has nothing Electric classes anything sort As have already said current industry chal lenge will eventually shake itself out offering simply purposes estab lishing particular motor battery prop go together some plane achieve desired performance viewing motors according power handling ability will see way dealing motor size result extensive accumulated experi ence over yearssomething has effect attach conservative reasonable operating limits voltage andlor current motor use seems like obvious thing motor capable efficiently handling some range voltage current work load series has used motor power input reference throughout difficulty approach based experience judgment preferences Since established standard cannot readily find applicable data except series rea son have attempted provide exten sive listing hope ones interest will covered possible will add listing future get information case anyone ts wondering yes took single data point given tabulations will find combinations motors props voltages currents amperes viewed information preceding parts should permit mix match avail able hardware choice model achieve performance desire table rest series go gether apply lessons past information installment will have brought together Electric Elation yours Some products listed table now discontinued since still use have included information Some motors quite new have bench data shown may yet have flown operating conditions given ac tual ones would use Most also maximum levels would impose regard important keep mind conservative attitude remind because will no doubt find cases choices differ manufac turers recommendations will tell straight out have plenty experi ence some published combinations have very rapidly ruined brushes commutators should obvious have costly lessons am well aware strong temptation just put bigger prop Ive paid hard cash replace ments too often due blunder data has taken described ear lier series bench data very useful correlates well actual flying results applications Remember Continued page 173 Sleeve Puller- $795 BearIng Puller $895 SEE YOUR LOCAL HOBBY DEALER IF UNAVAILABLE LOCALLY SEND TO Add 75 shippingMichigan residents add 4% sales tax Bru Line Industries Inc PO Box 3786 Center Line Michigan 48015 finish-sanding 3A2 sheet wing platform securely cemented top pylon left now determine exact CO location parts accesso ries assembled proper position pylon permanently cemented top fuselage box have often asked have ever pylon separate fuselage using method can say have used built-up pylon feature its simple direct cement attachment method about 12 years have yet have failure course attachment should made either epoxy cya noacrylate such Super T cellulose cement might too reliable application cover fuselages colored tissue silkspan using nitrate dope After few coats dope fog thin coat clear K&B Super Poxy usually will add heav ier color coating Super Poxy around engine pylon areas ward off fuel prob lems well add bit contrasting color model other accessories pretty much self-explanatory experienced modelers will incorporate own pet tachments anyway An auto-rudder corporated prototype model feature omitted subsequent deemed unnecessary model seems have plenty speed termina tion engine run coast flat right-right glide pattern aid automatic fin-kicker completely finished Nit Wit should thoroughly checked warps proper alignment am firm believer ample pre-flight preparations prevent first flight washout possibility stab should perfectly flat free warps Both wing tips should washed-out about A6 no 3A2 left inner panel should flat right inner panel should incorporate about A6 3Az washin situations can easily attained over steamy teakettle check results repeatedly few days guarantee permanent settings rudder should warped no about 2 right compensate right wing washin engine should mounted about /2 degree left sidethrust Run engine number times en sure initial timer setting about 3 sec doesnt sound like much model will get away quickly after launch initial test hop made prop frontwards engine leaned out am firm advocate vertical launch theory assumes model trimmed no drastic warps kind launched vertically almost model will travel directly away ground should have tendency little out trim will take time 3 sec turn around come back least hard ground moves much further away faster rate vertical launch old ignition-era low angle-of-attack-type launches used years An other argument since ultimate launch angle will about 800 ground way waste time submit backward-mounted broken props beginning near-horizontal low power trimming procedure gradually moving up eventual contest launch mode can just point model straight up engine screaming 3-sec test hop get scary agony over hurry certainly sounds simple anyway doesnt Speaking agony point shall volunteer relieve further claims testimonials contest potential Nit Wit design has enjoy able hope may find just enjoyable well See downwind Electrics/Kopski Continued oaoe 82 prop unloads flight motor cur rent decreases perhaps 10-15% cooling air flows motor battery youve applied what youve read series Most importantly power infor mation given directly applicable various rules thumb given previously Basically two limitations recognize determining quit pushing some motor current limi May1984 173 HobbypoxySt selei colors tallics h finishing flat can spray productstthobby close Whether model wood metal fiberglass plastic combina tion whether flies sails rolls Hobbypoxy formulated let paint build repair pamper perfection HOBBYPOXY PRODUCTS division Pettit Paint Company Inc 10 Pine Street Box 378 Rockaway NJ 07866-0378 IC1 big FREE offer Send complete literature howto-guide well tell qualify time get acquainted offer $475 worth Hobbypoxy products abso lutely FREE Wing Span -796 HObbY H0rn Wing Area-564 Sq JVfW SENSOAR glider HOBBY HORN Baclusice HOBBY HORN Kit SENSOAR Glider kit high quality kit Machine cut S sanded parts Select quality balsa spruce Detailed plans written instructions THERMAL SLOPE 55 ELECTRIC POWER VALUE PRICE0a $1500 OLD Tt7R Ki2S butt adS Partsat t{tts P & P Semi-Kits Combined full strtpwoad plan Now Wire Window etc Mut Note may purchased just semi kits planswrite call prices 1936 Buccaneer84$S1 t938 Clipper MN t72-539 1937 Daltaire Sptser100$6t 1940 Rangerat- $27 1939 Mereury72056 5935 Miss Ameriea-84$59 t941 Playboy Jr54-S20 194t Playhoy Sr-60-$46 1030 Power House84-543 1940 Soitptane-78- $74 t940 So LongS0S2t t939 Trenton Terror-72-S32 t939 Zipper54$48 t939 Kords Wokefietd-44- $17 MIDWAY MODEL CO Semi-kilo Combined u/strip 1936 Ftying Quaker84549 1937 Quaker Flosh67530 1937 Long Cebin7t$42 t937 Air Ctdef6t-940 STRUCKS 1940 79 Span 035 Sq .Imin SEMI KIT Plan lncl$3300 N9W IUIDI Combo Pull Kit $6300 SCALE PLANE ORAWINOB 5SO HEINKEL 1-IEtOOD 62 60s $1000 SHtPPtNG AND HANDLING 04 Page CATALOODE Op $000 add $150 $200 PP/tst Class $801 $2000 add $225 copy will aent $2001 $4500 add $300 free-when requested$4501 $7000 add $350 order over $7000 add $400 HOBBY HORN CA Addressees add 6% taX 00hobby specialties** Send 510 Visa/MC#-Exp 15173 Moran Street [Al Check attow up 30 PO Boo 2212 days check clearance Westminster Ca 92603 ICODExact Charges 719 0930311 1 ttdt Cash DntY[Att DPS] 719 0951203 tation motor has some operating cur rent brushes commutators give up can other adverse effects very high currents also Another stop point power limitation examine table carefully will see examples motor used direct drive relatively low voltage high current again relatively high voltage high current speed reducer latter case motor actually handling total power cause relatively high voltage anti high current always some operating power level physical makeup hardware simply cant handle load efficientlyhence power limitation As general rule can handle use ful power given motor used mechanical speed reducer because effect voltage prop choices can used still main taining same safe operating current level will also notice motors same size listed familiar names probably include some may have does know which tough Over years have appeared example several 075s have look-alike labels Unless have enough experience backup data youre probably out luck identifying product part number vintage Regarding Nom Volts column numbers given small ranges small band variation helps en compass battery voltage drop during run down also small difference oc curs between batteries different capacity ampere-hour rating under given load Before finishing information about table please advised have spent much tedious time during 1983 Christ mas holiday gathering listing data believe correct also recognize possibility error something just doesnt look right drop line Whats next Now series has got ten point some readers still have puzzled looks lets stand off reflect whats written far No doubt youve come far youre satisfied Electric works just want get WM 6 Send $100 Cash Check Stamps 32 Page Tabloid size illustrated DISCOUNT Catalog Sent 1st Class Mail COMET COX FLYLINE FOX GOLDBERG GUILLOWS JETCO K&3- PACTRA- PECK POLYMER PERFECT SIG STERLING SULLIVAN TOP FLITE & OTHERS PENN VALLEY HOllY CENTER 937 1 Main St LansialePa 19446 IOISI ess-1a68 308 0550 itor perhaps improve upon what already have going Perhaps example would help dissolve remaining puzzle ment Lets consider some moderate-sized sport Electric application First power system Well start because weve just covered power systems Besides part may represent biggest cash outlay An easy choice something based six-cell 1 2 Ah battery Youll remember popular easy charge Suppose want useful power run about 5 mm use conservative charging techniques described Part 4 means battery will charged about 60-65 ampere-minutes expect get about 90% charge out battery about 55 Am power system required average current about 11 amps nominal S mm motor run would result power motor would average about 75 watts about 68 volts x 11 amps during battery run-down look table youll see plenty lightweight motor/prop combinations could choose Some given bit power could outfitted slightly smaller props speed control could used What can about 75 watts Part 8 know relate cruise motor input power thats start Since sport plane lets pick wing loading about 14 oz/sq ft Using Rule Thumb No 1 can plug numbers see what happens Rule Thumb No 1 Watts ds X Oz/sq ft cruise Therefore 75 14 plane can weigh 75/14 about 5 lb plane would very impressive equation predicts cruising flight plane would no fun fly would large marginal fact hot humid weather youd probably experience powered sink Bystanders would announce glee Electric no good What Divide two little design now beginning shape upa 2-lb 40 oz airplane about 75 watts power reasonable power system battery will weigh Continued page 176 174 Model Aviation j %SCALECHIPMUNK3/8 SCALE STARDUSTER Send $100 catalog 2 16-499-5323 RC Kits Mfg IUIILU LI Canton UEL 706 Easton NE OH 44721 /a STEPHENS ACRO SEE HOT STUFFTMVI DEO-TI PS VHS CASSETTES #S 1 2 CLIP THIS COUPON SEND $5500 check MO GET BOTH VHS TAPES PLUS 1 EA 2 oz HOT STUFF 2 oz SUPER T 3 oz HOT SHOT FREE OFFER GOOD IN US ONLY THRU JUNE 04 PO BOX 836 fl~jpj SIMI CA 93062 7 805 522-0062 NOW THERES QUICK AND EASY WAY OF CLEANING YOUR MODEL CRAFTS Super-K Model Cleaner Removes fuel Residue dirt contact CUTS CLEANING TIME IN HALF Just spray model solvent wipe th soft cloth paper towel SIMPLE AS THAT Leaves craft showcase clean eWont harm Paints Coverings Dries Cleor fast Ulminales Woric cleanIng model SiTong Professional Quality formula Great any Model Craft Boats Rones Helicopters Cleans Gently Protects delicate model DEALERS WANTED DOMESTIC & OVERSEAS WE EXPORT Hurry Have product shelves time Christmas guaranteed top seller Sugg retail $550 per gallon Contact us price structures ordering intormallon Also ask about other Super-K products Model Industly Are Manufacturers & Major Brands DIstrIbutors Model Engines Kits Radios & Accessories Super-K o brand Kings Radio Control Hobbies International 3960 West 16th Ave Hialeah Florida 33012 Phone 305 557-2024 Electrics/Kopski Continued page 174 about 2 oz lls 12 oz average motor application will weigh about 7 oz Add ounce wiring etc power system will weigh 19-20 oz half total planned weight thus conforming Rule Thumb No 3 given last month three-channel radio small servos 250 mAh pack will about 7 oz leaves about 4027 13 oz everything else possible Yep Look photo fo Ken Stinsons ver sion Spectra choice Astro 2107 now discontinued suitable alter native no problem 8 x 4 Top Rite nylon prop six-cell pack three chan nels all-up weight about 38 oz5% below design goal wing 8 50 loading about 137 oz/sq ft Does power portion flight reach 5 mm least doesnt table predict 13-amp 90-watt operating condition combination Sharp arent Yes remember cur rent will drop somewhere around 10-15% flight Thats pretty close gotcha What about total flight time Since Ken flies plane part time glide typical flight 8-10 mm no lift Ken learned fly plane gen erally flies what can honestly called sport fashion have Thats its done Simple huh told earlier no magic involved remember weight very sensitive parameter determining resulting performance Electric Rule Thumb No puts ball park power cruisenot much perfor mance As example above make plane half less weight predicted rule ectric Elation will yours possible something go wrong such arithmetic correct plane still wont fly well Yes Remember rules thumb nominal planes example Kens plane has timehonored 12% flat-bottom section havent tried Im confident 8% fully-symmetrical 500 class airfoil just wouldnt work power level 75 watts could spent power system gross inefficiencysay some unimaginable 3-in prop 25000 rpm Ive seen could have relatively high wing loading sufficiently thin airfoil lots drag such Scale job speed required sustain lift would possible prop reasonable diame ter pitch estimated power Yes f work can make fly prove Electric doesnt work Thats Im writing youre reading MA series Thats folks really though feel has come together promised still say Next month Part 10 will wrap-up review sorts Well touch-up some thin areas look GLASS CLOTHO6 oz Lightest best coserleg glass clothO6 oz/sq yd Satisfied customers in49 States & 24 Countries DAN PARSONS PRODUCTS Dept 15 ft $2080. 30 ft $3660 38 wide Postage pd us & CanImmediate shipment Check MO. MasterCard & visa welcomed 11809 Fulme, NE Albuquerque NM 87111 505 296-2353 CUSTOM FOAM WINGS d TAILS CUSTOM SAILPLANE WINGS d TAILS SPRAY ADHESIVES FIBERGLASS FUSELAGES HI STARTS BALSA d PLYWOOD SEND 50W d IOSASE FOR INFO ESS BOX 437 LEMONT PA 16851 some most-often-asked questions Also Ill try include some photos information outstanding models have Electric Fly events past years construction article will follow sub sequent issue will some series supplements plan latter has fully developed expect sup plements will cover some selected subjects detail Examples could include such things basic electric power system mea surements suitable model designs new products emerge perhaps popular kit conversions Electric Along line have ideas supplements please send sug gestions have questions related previous installments please direct SASE au thor Bob Kopski 25 West End Dr Lan sdale PA 19446 Soaring Aips/Pruss Continued page 88 wondering anyone just might up Wednesday afternoon Helmut Hansruedi just laughed caught reactions Neil myself known about along trip because aeroclub Helmuts home town Bern up one-week holiday Twenty-eight fliers fain176 Model Aviation ~imiiirnP40CARDKIT FULL COLOR EXACT REPRODUCTION ow $500 REMEMBER HOW ~ONLYWELL THEY FLEW Spienial ellen iseladee sespes reosinleg baleen sat re pdoe Seed Ta ee fl Madeis PO Sea 2 mm ReeaISs MI 48886 UNIQUE NOSTALGIC GIFT SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE ON CATALOG48500 MC KENZIE HWY S3OOVIDA OREGON 97488 PUAW DIESELS Englands Finest 049 35 New low low prices Send $100 list Eric Clutton Rt 4 Box 1109C Edmond OK 73034 Very strong two-pieCO wifl Ares 23 lbs USE T-CRAFT 5/ WIRE Fell siac detailed plans PP$2500 Other superb giant-scaic plans tull size S PT-iS Oriadra KIorile$2800 toe- Farosas Mosquito Oaada$2400 80 Farnoan Mosqoito 40-SO Foor-seelsSt 700 Send sash check 0 moneYPlans sort relied UPS POST ords toPAID tornigo orders add 401s airmail desiredSerdIarrase brochures 0111 Taylorcratt plorr oterints