THE ECS lists modeler month Hes Don Hartman PO Box 180 Etowah North Carolina 28729 Don would like meet up other Electric fliers Ashville-Hendersonville and/or Greenville-Spartenburg areas South Carolina Don tells far hes aware other E-oriented modeler locally lets get touch change tell im Bob sent ya Motor Noise topic covered last October column didnt plan matter soon some good new stuff has come along want share right away recently received letter reader Dennis Vollrath South Milwaukee Wisconsin Dennis described lengthy successful battle absolutely brutal motor noise problem particular installation problem wherein usual stuffoptocoupling multiple brush capacitors etc just didnt work just about same time several phone conversations well known highly respected E-flier Keith Shaw Keith having major motor noise problems particular installation well too defied normal approaches Keith solved problem though Now just happens both problems appear same basic though unusual nature can happen twice probably happening twiceperhaps some Additionally will see its probably fair call two cases motor noise problemsits just seem like motor noise problems further both problems appear same nature solutions same First some background noise situation receiver sees incident signals real intended own transmitter undesired ones noise such electric motor elsewhere Glitches Electrics can occur undesired signals win out over competing real signal transmitter receiver decodes misinformation supplying errant instructions servos fact its common observe rapid though short-lived departures intended flight path and/or hear sudden though short motor speed changes just such glitches past Ive usually referred motor-related noise radio static simple purpose conveying idea involved can matter jargon suggests Now its relatively easy imagine understand motor noise because 50 Model Aviation cRU Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Months Topics 1 Electric Connection Service 2 Motor NoiseMuch 3 New Products 4 Power Flier 5 EMFollow-up j / 4. Youre ooklng first place winner 1991 Nationals Class Electric Old Timer eventJerry Smartt Warsaw MO plene l Cleveland Viking geared 05 FAI cp bait turning 14 x 85 Aeronaut prop up 1s38 oz 650 mAh pack Climb straight up Clever wheel Idea uses lightweight plastic camera lens covers a cores metal center bushing Nice work Jerry Close-up new Astro slotted Druen com pared earlier regular brush Astro claims much cooler running brush tempera tures significantly extended brush life Solar UHU brand new Item Hobby Lobby 71-in wing support 20 solar cells weigh four oz con stantly charge six-cell pack used power Electric Outside Inside views Astros Model 1 1OA Peak Detector Charger up grade over earlier version now cludes current adjustment Charger oper ates 12-volt source accommodates four 12 cells 450 1700 mAh capacity includes voltage monItor jacks Automati cally shuts down full charge Works well auto engine running R C TRADER LINE new & used items 1 -900-933-3005 $1 75 PER MINUTE ESO INC 3953 WInters Hill Dr Atlanta Georgia 30360 404550-9456 E-fliers well aware electrical sparking commonly occurs brush-commutator interface running motor sparks contain electrical energy spread over very wide range frequencies including radio frequency channel youre flying Such interference can both transmitted through air nearby receiver well conducted through model wiring right receiver past column has shown ways deal matters Specifically properly installed capacitors motor brushes can reduce eliminate higher radio frequencies sparking Also optocoupled speed controls and/or chokes speed control receiver leads can break up conduction path approaches can very effective So didnt methods work two modelers above Just can interfering frequency content motor sparking can interfering frequency content least other place electric power systemthe speed control operation As described times before speed controls work turning motor voltage off ratio time voltage time its off determines average voltage applied motor thus its speed Electronic speed controls vary ratio way full off full vary transmitter stick position Now just happens some speed controls on/off switching very fast means takes very little time motor voltage transition occur perhaps microseconds millionths second fast switching action itself generates very high frequenciesmuch higher basic clock rate speed control operates Herein lies culpritrelated same motor brush sparking model Herein lies problem experienced two readers above Heres detail normal operation receiver designed process signals two three specific frequencies depending whether have single double conversion radio First course radio frequencyyour channel frequency intended signal arriving antenna described above addition however receivers amplify intermediate frequencies fact receiver gain found tuned IF amplifiers intermediate frequencies usually 107 mHz 455 kHz double conversion receivers just 455 kHz single conversion receivers exists offending interference December 1991 51 r Its new exciting way buy sell trade new used RC equipment ELECi SWAP MEET Weve harnessed power computerized call processing give cor nce placing want ad phone comfort easy chair systi deveb RC modelers give economical way reach RC buyers R can place ad up 20 seconds length 2 minutes ad less cost RC magazin&lineA MEET items ar items can c buy yoof ads i sk 30 40 SOARING OR TRUCKS ENGINES OR RADIOS 80 ITEMS WANTED 90 MISCELLANEOUS Continued page 141 muuuw unny pipe IS Dy MRS OWfl s columi 5 lb geared 05 cobalt-powered ship easily ioops mRli cells MK 11 x 7 prop Bill charged up over Iper Sunny scale-up lower edges W-5 again time guide remove A6 inch wood between forward sheeting notches rear sheeting notches both top bottom plywood rib should note Goldbergs sheeting % thick will still leave tiny tick notch locations after A6 inch caps has removed Once ply rib correctly shaped used cutting guide trim A6 inch away W-5 rib between front rear sheeting notches kits two W-4 ribs needed material removed rear sheeting notch main spar notch top bottom followed Cubs wing construction outlined manual except installing A6 x 14 inch cap strip material between front rear sheeting before fitting lower spar position spar glued cap strips well lower sheeting ribs modified no other changes construction necessary except adding caps top wing proper time Continued next month RC Electrics/Kopski Continued page 51 signal containing specific frequencies least likely get through receiver antenna likely get radiated signal right through non metal receiver case perhaps following wiring model now seems readers Vollrath Shaw just such problems Dennis kind enough share detail tale interference woe solved So large problem experienced glitching few feet transmitter antenna fully extended Dennis also found problem appeared partial throttle much less at full speeda seeming contradiction case motor brush noise interference Dennis dug deeper found THE AMERICAN M4DE RJL K61 metal multi mix carburetor 0-ring sealed needles Suggested Retali $16995 including muffler Two year warranty piece Hardened l Crankshaft New double baffle muffler Exceptionally durable single ring forged piston fitted hardened steel cylinder Schnuerle Ported Forged connecting rod bushed both ends 0-ring sealed Back Cover Aerospace Quality Investment Cast Crankcase Last year installed latest computer controlled machine technology now new K6 proof positive superior quality engine can produced right America affordable price Just think dont have send Dollars out country obtain Quality expect Priced just few Dollars cheapies below quality competition American Made K6 truly exceptional value Best have problem technical question factory just phone call away See favorite dealer contact us Information complete line RIL HP engines RJL Industries USA ox S Sierra Madre CA 91025 Telephone 818 359-0016 primary offending signal signal path 455 kllz receiver IF strip came conclusion using 455 kHz resonant circuit connected oscilloscope used sniffer Using Dennis found installation environment battery wiring etc etc very hot emissions frequency Most important Dennis observed offending 455 kHz noise present form bursts time related high speed switching signal speed control significant clue course full motor speed speed control output full no voltage switching occurring no interfering 455 kHz signalanother very significant observation Dennis solved problem wrapping receiver case plastic bag wrapped completely three layers household aluminum foil formed shield around case technically Faraday cage Finally plastic-bagged everything agaln metal-foiled case would touch short out anything else installation After Dennis delighted find no detectable interference problems sure sounds like metal receiver cases old have some real merit over now-popular plastic ones course another way reduce old timer perfectly proportioned modeling Curtlss Robin 049 Engines -Channel RIC 41 Wingspan Electric Power Optional $2695 no rroo Very few full scale aircraft ideally Suited model flight appealing old Curtiss Robin born spruce linen age beautifufty proportioned rubber electric glow engines Easy fun build trainer-like performance Flyline Models Catalog 505Prone 703 2739593 INE MODELS INC PO Box 2136 Fairfax VIrginia 22031 USA AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In 3 Axis Control Easy Construction TEAM INC BOX 338M BRADYVILLE TN 37026 615 765-5397 December1991 141 Dual Ball Bearings BUILD & FLY THE miniMAX YOURSELF o Computer Designed Part 103 Ultralight Wood Construction SPECIALISTS IN CUSTOM COX TEE DEE& REED ENGINES 020S 049S 051S 074S & 09S ALL CUS TOM & STOCKPARTS VAILABLE INDIWDUALL Y COMPETITIONACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRANDS OFGLOWPLUGS HARD- TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STITT SPA RK PLUGS SILK8 COLORS QUALITYDOPEBRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUEAND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS eliminate particular problem reduce eliminate offending frequency generation first place possible limiting speed motor voltage waveformie increasing rise fall times speed control output voltage waveform Please note time takes speed control output voltage go off vice versa its necessarily related basic clock rate latter frame rate high rate exactly what Keith did particular control MOSFET gate drive resistors readily accessible increased values MOSFETS have relatively high values gate capacitance driven relatively large resistors slower switch off doing Keith effectively lowered strength eliminated offending signal frequencies causing interference technically inclined lowered values higher order Fourier coefficients motor drive waveform guess seeing myself particular offenders probably also 455 kHz just like Denniss As normal case just motor brush noise safe expect higher motor voltage cells greater also will unusual problem just described Thus general larger power systems likely have kind trouble smaller ones Whatever given established methods dealing just motor noise capacitors optocoupled controls speed control/receiver lead chokes have generally proven very effective also experience glitching mid throttle settings full throttle chances very good situation described above exists further seems either shielding receiver maybe some associated receiver wiring and/or slowing speed control transition speed should cure problem Regarding latter sufficiently knowledgeable modify own speed control Keith did don t Send manufacturer explain what think needincluding copy column feel may help Most manufacturers really savvy should both understanding willing help Indeed know least has learned great deal modeler input has incorporated design enhancements product line over years just such information Electric still growing folks No knows Before leaving topical area Id like direct attention article Robert Johnson August 1991 issue RC Report magazine article Mr Johnson also describes some basics associated motor brush noise offers solution using specific ferrite toroidal cores upon winds motor leads addition also indicates such cores serve well speed control/receiver wires similarly wound feels works well 142 Model Aviation OUR RE V-UP IN VEN AVERAGES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON VISA/MC WWII AIRCRAFT SCALE DRAWINGS & SPECIFICATION SHEETS i200'Tj~ Send $300 Scole 3 Ve Fo Cotolog Draningo RANGER FIBERGLASS RANGER FIBERGLASS CO han been Box 879 specializing n custom design moldingCampton NH fac aernopace ndosty nnce 795903223 FLYINGNEW FREE FLIGHT MICRO-4 MOTOR FOR 50 TO 70 SQUARE 11CR MODELS MARY 1K 2Sf lIT RESIGIS SUITARLE ENTIRE SYSTEM WEIGhS 20 GRAMS EVERYTHING REERED TO FLY motor nicads props switch charger partstless 3 dry celisI FREE PLAN INCLUDED else has prop decals rare kill markings AM LTON Nob od 1! GGet decalspros major decalsCoTEL 4135254110 Seed 0wFAX 413-525-7794 NORTHEAST SCREEN GRAPHICS 21 FISHER AVE EAST LONGMEADOW MA 01028 plot airfoils dot malrh prInter FOILED_AGAIN! PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING RDGE o PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY vIA INTELLIGENT EDITOR USER-FRIENDLY MENIJDRIVEN OPERATION o INCLUDES 50 AIRFOIL FILES 26-PAGE USER MANUAL $45oo picose eOCiOa ieieneiiecoi he,k dccii Por USUS Reqicoi iOMPCiXTi*T oepeiWe compel end dot nih pacon Gin composer & paOe ine hewUS odiao5 steelS 52 053 diek Seed checko neq cole CYGNET Software619 792-8021 3525 Del Mar Heights #237b San Diego 92130 chokes-in-the-leads method historically promoted column Ive recently purchased various parts recommends have yet installed evaluated operation Perhaps Ill have some results report near future Meanwhile encourage read article New Electric Products never-ending way life nice folks Hobby Lobby continually update expand Electric Goodies section famous cotalog Such process goiag write time read new catalog #18 should available asking Just call write Hobby Lobby 5614 Franldin Pike Circle Brentwood Tennessee 37027 telephone 615/373-1444 head modeler HL Jim Martin pleasure meeting KRC meet two years ago also pleasure flying several HL products Jim recently sent some photos information new additions Electric line will appear new catalog Space does permit print bit Ive included rather interesting photo month Its Solar UHU Yup Solar wing supports four ounces worth 20-solar cells supplied caption reads Fly hours Incidentally have personally flown Catalogs Best Scale $500 Model Aircraft Plans Handbook 1990-91 $500 Scale Drawings Plans Handbook $500 RC Model World Plans Const Guide $500 Catalogs $400 ta 3 shipped 885-3959 New 138 pg GERMAN PLANS BOOKS $600 Other Catalogs Please add $200 Shipped Separately THE BEST IN SCALE Over 25 Years Service Winners Toledo Master Internals & Plans Epony Glass Kits Scale Documentation British Magazine Plans VISA/ MO Antiques Military Civilian Helicoptern Salplanes 3Oee plaSOaee 3-vrew daeings PAAekicluing KOKUFAN s4ae several regular UHUsgreat airplane Now youre charged up go order new Hobby Lobby catalog tell em Bob sent ya pet peeves addition hobby dealers bad mouth Electric expression power flier implications associated routinely hear read descriptor always used lend distinction wet power fliers sort macho manner Personally draw little no distinction between Electric wet fliers regard power feel anyone does resides aeromodeling dark ages acknowledge its easier install larger wet fuel tank Electric thats point Ill yield Simply put no going tell Electric aint got enough power Besides power fliers also include fly rubber C02 compressed air solar perhaps springs steam motivation So lets knock off macho power flier comynents get 90s-style Electric aeromodeling life Incidentally power thrill-seekers may suggest read Byron Blakeslees Soaring column October Model Aviation go look Hobby Lobby catalog again Neat sounding stuffi Reader Reaction July 91 invitation comment Electric Aeromodeling Association Special Interest Group SIG within AMA has drawn near zero response exact received letter wherein reader felt knocking both EAA folks worked hard establish EAA-backed AMA Electric rules fact what felt did BRAMJER RIRCRRFT DESIGNS BRD KITS FLY BEST WS 68 -883 aqin Length 59 90 108 2C 12040 Weicht 95/1O5tb 40 S&H WS 52 1050 sqin Lehu ov 95/1 OSIb Ultimate KITS INCLUDE Epoxyglass fuse bellypan cowl cock pit lpants applicable Virgin bead foam wing cores wings 1 piece internal formers machine cut birch ACP t ply Illustrated construction manual Clear butyrate canopy Preformed T-6 aluminum landing gear Plug stab kit TO ORDER CALL 215-759-3179 VISA/MC ACCEPTED December 1991 143 PRICE 5295 PREFLIGHT TIE DOWN Heavy duty safety tie down Gray Brothers start up idling size fits models quarter scale Big Birds down Only $1650 plus $550 shipping & handling combination soft fuel resistant foam padding heavy gage steel make unit valuable preflight tools Send check Gray Brothers money order Stamping 8 Machine Inc 424 West Chicago Road West Pigeon MI 49099 FOX 2-4 Cycle Special Glow Plug 40702 Miracle Plug totally new concept glow plug design Instead using idle bar MIRACLE PLUG built pre-combustion chamber important thing glow plug retains heat better other glow plug know Try notice much smoother motor responds throttle commands Also will probably able fly less intro fuel Try low intro fuel wouldnt rev-out before Tests also show reduced fuel consumption cases WARNING! motor will probably idle faster re-set throttle erwise might able land Hard believe rse check out MIRACLE PLUG case Youll love FLY AMERICAN *** FLY FOX FOX MANUFACTURINO COMPANY July column simply invite reader feelings about EAA idea posing query came few readers incidentally particular some past reader letters comments questioned function value organization Some felt EAA focused interests very few E-fliers namely specializing highest possible Electric performance such may representing interests E-fliers AMA July column intended ask feelings about whether matters attendant question whether its time change EAA time 5305 Towsofl Avenue Fort Smith AR 72901 501 6461856 promised pass along results survey what Im now doing loud clear lack response view very strong message EAA Nuff said final column 1991 ends Please enclose SASE letter requesting response have good Electric fall season RC Helicopters/Jolly Continued page 53 crankshaft PLT allows re tighten prop nut removing engine machine PLT quality unit comes explicit instructions its use must warn you over torque prop-nut could cause serious damage piston connecting rod careful take easy other hand PLT looks much safer certainly desirable stuffing dowel exhaust port enginesomething Ive witnessed other fliers doing Concepts Board Systems can reached 7210 Jordan Ave Suite D37 Canoga Park CA 91303 818/999-3952 BCNU Arrow/Baxter Continued page 56 pack assembly making sure engine mounts aligned wing chord butted up landing gear sandwich assembly Build up sides engine mounts scrap balsa nose can faired spinner Install 1A6 wire pushrod add tank floor bulkheads Plank upper lower center section Install fuel tank Tail surfaces Hinge elevator used Goldberg nylon hinges Rather merely cutting slot elevator trailing edge cut shallow notches both surfaces hinges would mounted After installing hinges filled notches Model Magic Install control horn included bellcrank attach pushrod Glue fin Add fuselage sides triangular fillers top Engine installation Note engine offset Ive experimenting concept much favor foreign Combat fliers use good deal engine offsetbut no rudder offsetin straight airframe straight fin keeps airframe aligned flight path offset thrust maintains line tension combination works well model does foreign designs judging strength showing international competition 144 Model Aviation WE MAKE MIRACLES EVERY DAY 0 N m3oATh bt6 SETS oA6~ 1 aeosyeaP ----- UNA AIRCRAFTIRADIO ID LABEL SETS Identify sIrcsft per AMA safety rules Self stick labels easy apply peerraeeer Seen check set $125 plus 95 P&H $220 six sets 54 pks 195 P951 $5951 BalsadaS EneeryOses PS PaulO New York NY 10021 PINSPATCHES Ltctan rngfim L7 CUSTOM ENAMEL PINS & EMBROIDERED PATCHES MADE TO YOUR DESIGN 303 667-4940 P0 Box 1615Loveland COB0539 durable skis made lighweight aluminum feature unique steel spring holds ski rigid flight plus elevates axle above ski no modification current gear wire needed can go wheels skis seconds sides main skis also have special edge allows excellent tracking icy surfaces available three sizes can ordered trikes just mains order please send check money order MN add 6% sales tax Canada send US money order FREE SHIPPING Allow 2 weeks delivery Phone inquiries after 100 OSE 20-30 Trike2400Mains 2100 NORTHERN40 Trike2880Mains 2400 MODELING60 Trike3200Mains 2720 PRODUCTS PO Box 21181 ColumbIa Heights MN 55421 612-781-7333
Edition: Model Aviation - 1991/12
Page Numbers: 50, 51, 141, 142, 143, 144
THE ECS lists modeler month Hes Don Hartman PO Box 180 Etowah North Carolina 28729 Don would like meet up other Electric fliers Ashville-Hendersonville and/or Greenville-Spartenburg areas South Carolina Don tells far hes aware other E-oriented modeler locally lets get touch change tell im Bob sent ya Motor Noise topic covered last October column didnt plan matter soon some good new stuff has come along want share right away recently received letter reader Dennis Vollrath South Milwaukee Wisconsin Dennis described lengthy successful battle absolutely brutal motor noise problem particular installation problem wherein usual stuffoptocoupling multiple brush capacitors etc just didnt work just about same time several phone conversations well known highly respected E-flier Keith Shaw Keith having major motor noise problems particular installation well too defied normal approaches Keith solved problem though Now just happens both problems appear same basic though unusual nature can happen twice probably happening twiceperhaps some Additionally will see its probably fair call two cases motor noise problemsits just seem like motor noise problems further both problems appear same nature solutions same First some background noise situation receiver sees incident signals real intended own transmitter undesired ones noise such electric motor elsewhere Glitches Electrics can occur undesired signals win out over competing real signal transmitter receiver decodes misinformation supplying errant instructions servos fact its common observe rapid though short-lived departures intended flight path and/or hear sudden though short motor speed changes just such glitches past Ive usually referred motor-related noise radio static simple purpose conveying idea involved can matter jargon suggests Now its relatively easy imagine understand motor noise because 50 Model Aviation cRU Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Months Topics 1 Electric Connection Service 2 Motor NoiseMuch 3 New Products 4 Power Flier 5 EMFollow-up j / 4. Youre ooklng first place winner 1991 Nationals Class Electric Old Timer eventJerry Smartt Warsaw MO plene l Cleveland Viking geared 05 FAI cp bait turning 14 x 85 Aeronaut prop up 1s38 oz 650 mAh pack Climb straight up Clever wheel Idea uses lightweight plastic camera lens covers a cores metal center bushing Nice work Jerry Close-up new Astro slotted Druen com pared earlier regular brush Astro claims much cooler running brush tempera tures significantly extended brush life Solar UHU brand new Item Hobby Lobby 71-in wing support 20 solar cells weigh four oz con stantly charge six-cell pack used power Electric Outside Inside views Astros Model 1 1OA Peak Detector Charger up grade over earlier version now cludes current adjustment Charger oper ates 12-volt source accommodates four 12 cells 450 1700 mAh capacity includes voltage monItor jacks Automati cally shuts down full charge Works well auto engine running R C TRADER LINE new & used items 1 -900-933-3005 $1 75 PER MINUTE ESO INC 3953 WInters Hill Dr Atlanta Georgia 30360 404550-9456 E-fliers well aware electrical sparking commonly occurs brush-commutator interface running motor sparks contain electrical energy spread over very wide range frequencies including radio frequency channel youre flying Such interference can both transmitted through air nearby receiver well conducted through model wiring right receiver past column has shown ways deal matters Specifically properly installed capacitors motor brushes can reduce eliminate higher radio frequencies sparking Also optocoupled speed controls and/or chokes speed control receiver leads can break up conduction path approaches can very effective So didnt methods work two modelers above Just can interfering frequency content motor sparking can interfering frequency content least other place electric power systemthe speed control operation As described times before speed controls work turning motor voltage off ratio time voltage time its off determines average voltage applied motor thus its speed Electronic speed controls vary ratio way full off full vary transmitter stick position Now just happens some speed controls on/off switching very fast means takes very little time motor voltage transition occur perhaps microseconds millionths second fast switching action itself generates very high frequenciesmuch higher basic clock rate speed control operates Herein lies culpritrelated same motor brush sparking model Herein lies problem experienced two readers above Heres detail normal operation receiver designed process signals two three specific frequencies depending whether have single double conversion radio First course radio frequencyyour channel frequency intended signal arriving antenna described above addition however receivers amplify intermediate frequencies fact receiver gain found tuned IF amplifiers intermediate frequencies usually 107 mHz 455 kHz double conversion receivers just 455 kHz single conversion receivers exists offending interference December 1991 51 r Its new exciting way buy sell trade new used RC equipment ELECi SWAP MEET Weve harnessed power computerized call processing give cor nce placing want ad phone comfort easy chair systi deveb RC modelers give economical way reach RC buyers R can place ad up 20 seconds length 2 minutes ad less cost RC magazin&lineA MEET items ar items can c buy yoof ads i sk 30 40 SOARING OR TRUCKS ENGINES OR RADIOS 80 ITEMS WANTED 90 MISCELLANEOUS Continued page 141 muuuw unny pipe IS Dy MRS OWfl s columi 5 lb geared 05 cobalt-powered ship easily ioops mRli cells MK 11 x 7 prop Bill charged up over Iper Sunny scale-up lower edges W-5 again time guide remove A6 inch wood between forward sheeting notches rear sheeting notches both top bottom plywood rib should note Goldbergs sheeting % thick will still leave tiny tick notch locations after A6 inch caps has removed Once ply rib correctly shaped used cutting guide trim A6 inch away W-5 rib between front rear sheeting notches kits two W-4 ribs needed material removed rear sheeting notch main spar notch top bottom followed Cubs wing construction outlined manual except installing A6 x 14 inch cap strip material between front rear sheeting before fitting lower spar position spar glued cap strips well lower sheeting ribs modified no other changes construction necessary except adding caps top wing proper time Continued next month RC Electrics/Kopski Continued page 51 signal containing specific frequencies least likely get through receiver antenna likely get radiated signal right through non metal receiver case perhaps following wiring model now seems readers Vollrath Shaw just such problems Dennis kind enough share detail tale interference woe solved So large problem experienced glitching few feet transmitter antenna fully extended Dennis also found problem appeared partial throttle much less at full speeda seeming contradiction case motor brush noise interference Dennis dug deeper found THE AMERICAN M4DE RJL K61 metal multi mix carburetor 0-ring sealed needles Suggested Retali $16995 including muffler Two year warranty piece Hardened l Crankshaft New double baffle muffler Exceptionally durable single ring forged piston fitted hardened steel cylinder Schnuerle Ported Forged connecting rod bushed both ends 0-ring sealed Back Cover Aerospace Quality Investment Cast Crankcase Last year installed latest computer controlled machine technology now new K6 proof positive superior quality engine can produced right America affordable price Just think dont have send Dollars out country obtain Quality expect Priced just few Dollars cheapies below quality competition American Made K6 truly exceptional value Best have problem technical question factory just phone call away See favorite dealer contact us Information complete line RIL HP engines RJL Industries USA ox S Sierra Madre CA 91025 Telephone 818 359-0016 primary offending signal signal path 455 kllz receiver IF strip came conclusion using 455 kHz resonant circuit connected oscilloscope used sniffer Using Dennis found installation environment battery wiring etc etc very hot emissions frequency Most important Dennis observed offending 455 kHz noise present form bursts time related high speed switching signal speed control significant clue course full motor speed speed control output full no voltage switching occurring no interfering 455 kHz signalanother very significant observation Dennis solved problem wrapping receiver case plastic bag wrapped completely three layers household aluminum foil formed shield around case technically Faraday cage Finally plastic-bagged everything agaln metal-foiled case would touch short out anything else installation After Dennis delighted find no detectable interference problems sure sounds like metal receiver cases old have some real merit over now-popular plastic ones course another way reduce old timer perfectly proportioned modeling Curtlss Robin 049 Engines -Channel RIC 41 Wingspan Electric Power Optional $2695 no rroo Very few full scale aircraft ideally Suited model flight appealing old Curtiss Robin born spruce linen age beautifufty proportioned rubber electric glow engines Easy fun build trainer-like performance Flyline Models Catalog 505Prone 703 2739593 INE MODELS INC PO Box 2136 Fairfax VIrginia 22031 USA AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In 3 Axis Control Easy Construction TEAM INC BOX 338M BRADYVILLE TN 37026 615 765-5397 December1991 141 Dual Ball Bearings BUILD & FLY THE miniMAX YOURSELF o Computer Designed Part 103 Ultralight Wood Construction SPECIALISTS IN CUSTOM COX TEE DEE& REED ENGINES 020S 049S 051S 074S & 09S ALL CUS TOM & STOCKPARTS VAILABLE INDIWDUALL Y COMPETITIONACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRANDS OFGLOWPLUGS HARD- TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STITT SPA RK PLUGS SILK8 COLORS QUALITYDOPEBRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUEAND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS eliminate particular problem reduce eliminate offending frequency generation first place possible limiting speed motor voltage waveformie increasing rise fall times speed control output voltage waveform Please note time takes speed control output voltage go off vice versa its necessarily related basic clock rate latter frame rate high rate exactly what Keith did particular control MOSFET gate drive resistors readily accessible increased values MOSFETS have relatively high values gate capacitance driven relatively large resistors slower switch off doing Keith effectively lowered strength eliminated offending signal frequencies causing interference technically inclined lowered values higher order Fourier coefficients motor drive waveform guess seeing myself particular offenders probably also 455 kHz just like Denniss As normal case just motor brush noise safe expect higher motor voltage cells greater also will unusual problem just described Thus general larger power systems likely have kind trouble smaller ones Whatever given established methods dealing just motor noise capacitors optocoupled controls speed control/receiver lead chokes have generally proven very effective also experience glitching mid throttle settings full throttle chances very good situation described above exists further seems either shielding receiver maybe some associated receiver wiring and/or slowing speed control transition speed should cure problem Regarding latter sufficiently knowledgeable modify own speed control Keith did don t Send manufacturer explain what think needincluding copy column feel may help Most manufacturers really savvy should both understanding willing help Indeed know least has learned great deal modeler input has incorporated design enhancements product line over years just such information Electric still growing folks No knows Before leaving topical area Id like direct attention article Robert Johnson August 1991 issue RC Report magazine article Mr Johnson also describes some basics associated motor brush noise offers solution using specific ferrite toroidal cores upon winds motor leads addition also indicates such cores serve well speed control/receiver wires similarly wound feels works well 142 Model Aviation OUR RE V-UP IN VEN AVERAGES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON VISA/MC WWII AIRCRAFT SCALE DRAWINGS & SPECIFICATION SHEETS i200'Tj~ Send $300 Scole 3 Ve Fo Cotolog Draningo RANGER FIBERGLASS RANGER FIBERGLASS CO han been Box 879 specializing n custom design moldingCampton NH fac aernopace ndosty nnce 795903223 FLYINGNEW FREE FLIGHT MICRO-4 MOTOR FOR 50 TO 70 SQUARE 11CR MODELS MARY 1K 2Sf lIT RESIGIS SUITARLE ENTIRE SYSTEM WEIGhS 20 GRAMS EVERYTHING REERED TO FLY motor nicads props switch charger partstless 3 dry celisI FREE PLAN INCLUDED else has prop decals rare kill markings AM LTON Nob od 1! GGet decalspros major decalsCoTEL 4135254110 Seed 0wFAX 413-525-7794 NORTHEAST SCREEN GRAPHICS 21 FISHER AVE EAST LONGMEADOW MA 01028 plot airfoils dot malrh prInter FOILED_AGAIN! PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING RDGE o PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY vIA INTELLIGENT EDITOR USER-FRIENDLY MENIJDRIVEN OPERATION o INCLUDES 50 AIRFOIL FILES 26-PAGE USER MANUAL $45oo picose eOCiOa ieieneiiecoi he,k dccii Por USUS Reqicoi iOMPCiXTi*T oepeiWe compel end dot nih pacon Gin composer & paOe ine hewUS odiao5 steelS 52 053 diek Seed checko neq cole CYGNET Software619 792-8021 3525 Del Mar Heights #237b San Diego 92130 chokes-in-the-leads method historically promoted column Ive recently purchased various parts recommends have yet installed evaluated operation Perhaps Ill have some results report near future Meanwhile encourage read article New Electric Products never-ending way life nice folks Hobby Lobby continually update expand Electric Goodies section famous cotalog Such process goiag write time read new catalog #18 should available asking Just call write Hobby Lobby 5614 Franldin Pike Circle Brentwood Tennessee 37027 telephone 615/373-1444 head modeler HL Jim Martin pleasure meeting KRC meet two years ago also pleasure flying several HL products Jim recently sent some photos information new additions Electric line will appear new catalog Space does permit print bit Ive included rather interesting photo month Its Solar UHU Yup Solar wing supports four ounces worth 20-solar cells supplied caption reads Fly hours Incidentally have personally flown Catalogs Best Scale $500 Model Aircraft Plans Handbook 1990-91 $500 Scale Drawings Plans Handbook $500 RC Model World Plans Const Guide $500 Catalogs $400 ta 3 shipped 885-3959 New 138 pg GERMAN PLANS BOOKS $600 Other Catalogs Please add $200 Shipped Separately THE BEST IN SCALE Over 25 Years Service Winners Toledo Master Internals & Plans Epony Glass Kits Scale Documentation British Magazine Plans VISA/ MO Antiques Military Civilian Helicoptern Salplanes 3Oee plaSOaee 3-vrew daeings PAAekicluing KOKUFAN s4ae several regular UHUsgreat airplane Now youre charged up go order new Hobby Lobby catalog tell em Bob sent ya pet peeves addition hobby dealers bad mouth Electric expression power flier implications associated routinely hear read descriptor always used lend distinction wet power fliers sort macho manner Personally draw little no distinction between Electric wet fliers regard power feel anyone does resides aeromodeling dark ages acknowledge its easier install larger wet fuel tank Electric thats point Ill yield Simply put no going tell Electric aint got enough power Besides power fliers also include fly rubber C02 compressed air solar perhaps springs steam motivation So lets knock off macho power flier comynents get 90s-style Electric aeromodeling life Incidentally power thrill-seekers may suggest read Byron Blakeslees Soaring column October Model Aviation go look Hobby Lobby catalog again Neat sounding stuffi Reader Reaction July 91 invitation comment Electric Aeromodeling Association Special Interest Group SIG within AMA has drawn near zero response exact received letter wherein reader felt knocking both EAA folks worked hard establish EAA-backed AMA Electric rules fact what felt did BRAMJER RIRCRRFT DESIGNS BRD KITS FLY BEST WS 68 -883 aqin Length 59 90 108 2C 12040 Weicht 95/1O5tb 40 S&H WS 52 1050 sqin Lehu ov 95/1 OSIb Ultimate KITS INCLUDE Epoxyglass fuse bellypan cowl cock pit lpants applicable Virgin bead foam wing cores wings 1 piece internal formers machine cut birch ACP t ply Illustrated construction manual Clear butyrate canopy Preformed T-6 aluminum landing gear Plug stab kit TO ORDER CALL 215-759-3179 VISA/MC ACCEPTED December 1991 143 PRICE 5295 PREFLIGHT TIE DOWN Heavy duty safety tie down Gray Brothers start up idling size fits models quarter scale Big Birds down Only $1650 plus $550 shipping & handling combination soft fuel resistant foam padding heavy gage steel make unit valuable preflight tools Send check Gray Brothers money order Stamping 8 Machine Inc 424 West Chicago Road West Pigeon MI 49099 FOX 2-4 Cycle Special Glow Plug 40702 Miracle Plug totally new concept glow plug design Instead using idle bar MIRACLE PLUG built pre-combustion chamber important thing glow plug retains heat better other glow plug know Try notice much smoother motor responds throttle commands Also will probably able fly less intro fuel Try low intro fuel wouldnt rev-out before Tests also show reduced fuel consumption cases WARNING! motor will probably idle faster re-set throttle erwise might able land Hard believe rse check out MIRACLE PLUG case Youll love FLY AMERICAN *** FLY FOX FOX MANUFACTURINO COMPANY July column simply invite reader feelings about EAA idea posing query came few readers incidentally particular some past reader letters comments questioned function value organization Some felt EAA focused interests very few E-fliers namely specializing highest possible Electric performance such may representing interests E-fliers AMA July column intended ask feelings about whether matters attendant question whether its time change EAA time 5305 Towsofl Avenue Fort Smith AR 72901 501 6461856 promised pass along results survey what Im now doing loud clear lack response view very strong message EAA Nuff said final column 1991 ends Please enclose SASE letter requesting response have good Electric fall season RC Helicopters/Jolly Continued page 53 crankshaft PLT allows re tighten prop nut removing engine machine PLT quality unit comes explicit instructions its use must warn you over torque prop-nut could cause serious damage piston connecting rod careful take easy other hand PLT looks much safer certainly desirable stuffing dowel exhaust port enginesomething Ive witnessed other fliers doing Concepts Board Systems can reached 7210 Jordan Ave Suite D37 Canoga Park CA 91303 818/999-3952 BCNU Arrow/Baxter Continued page 56 pack assembly making sure engine mounts aligned wing chord butted up landing gear sandwich assembly Build up sides engine mounts scrap balsa nose can faired spinner Install 1A6 wire pushrod add tank floor bulkheads Plank upper lower center section Install fuel tank Tail surfaces Hinge elevator used Goldberg nylon hinges Rather merely cutting slot elevator trailing edge cut shallow notches both surfaces hinges would mounted After installing hinges filled notches Model Magic Install control horn included bellcrank attach pushrod Glue fin Add fuselage sides triangular fillers top Engine installation Note engine offset Ive experimenting concept much favor foreign Combat fliers use good deal engine offsetbut no rudder offsetin straight airframe straight fin keeps airframe aligned flight path offset thrust maintains line tension combination works well model does foreign designs judging strength showing international competition 144 Model Aviation WE MAKE MIRACLES EVERY DAY 0 N m3oATh bt6 SETS oA6~ 1 aeosyeaP ----- UNA AIRCRAFTIRADIO ID LABEL SETS Identify sIrcsft per AMA safety rules Self stick labels easy apply peerraeeer Seen check set $125 plus 95 P&H $220 six sets 54 pks 195 P951 $5951 BalsadaS EneeryOses PS PaulO New York NY 10021 PINSPATCHES Ltctan rngfim L7 CUSTOM ENAMEL PINS & EMBROIDERED PATCHES MADE TO YOUR DESIGN 303 667-4940 P0 Box 1615Loveland COB0539 durable skis made lighweight aluminum feature unique steel spring holds ski rigid flight plus elevates axle above ski no modification current gear wire needed can go wheels skis seconds sides main skis also have special edge allows excellent tracking icy surfaces available three sizes can ordered trikes just mains order please send check money order MN add 6% sales tax Canada send US money order FREE SHIPPING Allow 2 weeks delivery Phone inquiries after 100 OSE 20-30 Trike2400Mains 2100 NORTHERN40 Trike2880Mains 2400 MODELING60 Trike3200Mains 2720 PRODUCTS PO Box 21181 ColumbIa Heights MN 55421 612-781-7333
Edition: Model Aviation - 1991/12
Page Numbers: 50, 51, 141, 142, 143, 144
THE ECS lists modeler month Hes Don Hartman PO Box 180 Etowah North Carolina 28729 Don would like meet up other Electric fliers Ashville-Hendersonville and/or Greenville-Spartenburg areas South Carolina Don tells far hes aware other E-oriented modeler locally lets get touch change tell im Bob sent ya Motor Noise topic covered last October column didnt plan matter soon some good new stuff has come along want share right away recently received letter reader Dennis Vollrath South Milwaukee Wisconsin Dennis described lengthy successful battle absolutely brutal motor noise problem particular installation problem wherein usual stuffoptocoupling multiple brush capacitors etc just didnt work just about same time several phone conversations well known highly respected E-flier Keith Shaw Keith having major motor noise problems particular installation well too defied normal approaches Keith solved problem though Now just happens both problems appear same basic though unusual nature can happen twice probably happening twiceperhaps some Additionally will see its probably fair call two cases motor noise problemsits just seem like motor noise problems further both problems appear same nature solutions same First some background noise situation receiver sees incident signals real intended own transmitter undesired ones noise such electric motor elsewhere Glitches Electrics can occur undesired signals win out over competing real signal transmitter receiver decodes misinformation supplying errant instructions servos fact its common observe rapid though short-lived departures intended flight path and/or hear sudden though short motor speed changes just such glitches past Ive usually referred motor-related noise radio static simple purpose conveying idea involved can matter jargon suggests Now its relatively easy imagine understand motor noise because 50 Model Aviation cRU Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Months Topics 1 Electric Connection Service 2 Motor NoiseMuch 3 New Products 4 Power Flier 5 EMFollow-up j / 4. Youre ooklng first place winner 1991 Nationals Class Electric Old Timer eventJerry Smartt Warsaw MO plene l Cleveland Viking geared 05 FAI cp bait turning 14 x 85 Aeronaut prop up 1s38 oz 650 mAh pack Climb straight up Clever wheel Idea uses lightweight plastic camera lens covers a cores metal center bushing Nice work Jerry Close-up new Astro slotted Druen com pared earlier regular brush Astro claims much cooler running brush tempera tures significantly extended brush life Solar UHU brand new Item Hobby Lobby 71-in wing support 20 solar cells weigh four oz con stantly charge six-cell pack used power Electric Outside Inside views Astros Model 1 1OA Peak Detector Charger up grade over earlier version now cludes current adjustment Charger oper ates 12-volt source accommodates four 12 cells 450 1700 mAh capacity includes voltage monItor jacks Automati cally shuts down full charge Works well auto engine running R C TRADER LINE new & used items 1 -900-933-3005 $1 75 PER MINUTE ESO INC 3953 WInters Hill Dr Atlanta Georgia 30360 404550-9456 E-fliers well aware electrical sparking commonly occurs brush-commutator interface running motor sparks contain electrical energy spread over very wide range frequencies including radio frequency channel youre flying Such interference can both transmitted through air nearby receiver well conducted through model wiring right receiver past column has shown ways deal matters Specifically properly installed capacitors motor brushes can reduce eliminate higher radio frequencies sparking Also optocoupled speed controls and/or chokes speed control receiver leads can break up conduction path approaches can very effective So didnt methods work two modelers above Just can interfering frequency content motor sparking can interfering frequency content least other place electric power systemthe speed control operation As described times before speed controls work turning motor voltage off ratio time voltage time its off determines average voltage applied motor thus its speed Electronic speed controls vary ratio way full off full vary transmitter stick position Now just happens some speed controls on/off switching very fast means takes very little time motor voltage transition occur perhaps microseconds millionths second fast switching action itself generates very high frequenciesmuch higher basic clock rate speed control operates Herein lies culpritrelated same motor brush sparking model Herein lies problem experienced two readers above Heres detail normal operation receiver designed process signals two three specific frequencies depending whether have single double conversion radio First course radio frequencyyour channel frequency intended signal arriving antenna described above addition however receivers amplify intermediate frequencies fact receiver gain found tuned IF amplifiers intermediate frequencies usually 107 mHz 455 kHz double conversion receivers just 455 kHz single conversion receivers exists offending interference December 1991 51 r Its new exciting way buy sell trade new used RC equipment ELECi SWAP MEET Weve harnessed power computerized call processing give cor nce placing want ad phone comfort easy chair systi deveb RC modelers give economical way reach RC buyers R can place ad up 20 seconds length 2 minutes ad less cost RC magazin&lineA MEET items ar items can c buy yoof ads i sk 30 40 SOARING OR TRUCKS ENGINES OR RADIOS 80 ITEMS WANTED 90 MISCELLANEOUS Continued page 141 muuuw unny pipe IS Dy MRS OWfl s columi 5 lb geared 05 cobalt-powered ship easily ioops mRli cells MK 11 x 7 prop Bill charged up over Iper Sunny scale-up lower edges W-5 again time guide remove A6 inch wood between forward sheeting notches rear sheeting notches both top bottom plywood rib should note Goldbergs sheeting % thick will still leave tiny tick notch locations after A6 inch caps has removed Once ply rib correctly shaped used cutting guide trim A6 inch away W-5 rib between front rear sheeting notches kits two W-4 ribs needed material removed rear sheeting notch main spar notch top bottom followed Cubs wing construction outlined manual except installing A6 x 14 inch cap strip material between front rear sheeting before fitting lower spar position spar glued cap strips well lower sheeting ribs modified no other changes construction necessary except adding caps top wing proper time Continued next month RC Electrics/Kopski Continued page 51 signal containing specific frequencies least likely get through receiver antenna likely get radiated signal right through non metal receiver case perhaps following wiring model now seems readers Vollrath Shaw just such problems Dennis kind enough share detail tale interference woe solved So large problem experienced glitching few feet transmitter antenna fully extended Dennis also found problem appeared partial throttle much less at full speeda seeming contradiction case motor brush noise interference Dennis dug deeper found THE AMERICAN M4DE RJL K61 metal multi mix carburetor 0-ring sealed needles Suggested Retali $16995 including muffler Two year warranty piece Hardened l Crankshaft New double baffle muffler Exceptionally durable single ring forged piston fitted hardened steel cylinder Schnuerle Ported Forged connecting rod bushed both ends 0-ring sealed Back Cover Aerospace Quality Investment Cast Crankcase Last year installed latest computer controlled machine technology now new K6 proof positive superior quality engine can produced right America affordable price Just think dont have send Dollars out country obtain Quality expect Priced just few Dollars cheapies below quality competition American Made K6 truly exceptional value Best have problem technical question factory just phone call away See favorite dealer contact us Information complete line RIL HP engines RJL Industries USA ox S Sierra Madre CA 91025 Telephone 818 359-0016 primary offending signal signal path 455 kllz receiver IF strip came conclusion using 455 kHz resonant circuit connected oscilloscope used sniffer Using Dennis found installation environment battery wiring etc etc very hot emissions frequency Most important Dennis observed offending 455 kHz noise present form bursts time related high speed switching signal speed control significant clue course full motor speed speed control output full no voltage switching occurring no interfering 455 kHz signalanother very significant observation Dennis solved problem wrapping receiver case plastic bag wrapped completely three layers household aluminum foil formed shield around case technically Faraday cage Finally plastic-bagged everything agaln metal-foiled case would touch short out anything else installation After Dennis delighted find no detectable interference problems sure sounds like metal receiver cases old have some real merit over now-popular plastic ones course another way reduce old timer perfectly proportioned modeling Curtlss Robin 049 Engines -Channel RIC 41 Wingspan Electric Power Optional $2695 no rroo Very few full scale aircraft ideally Suited model flight appealing old Curtiss Robin born spruce linen age beautifufty proportioned rubber electric glow engines Easy fun build trainer-like performance Flyline Models Catalog 505Prone 703 2739593 INE MODELS INC PO Box 2136 Fairfax VIrginia 22031 USA AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In 3 Axis Control Easy Construction TEAM INC BOX 338M BRADYVILLE TN 37026 615 765-5397 December1991 141 Dual Ball Bearings BUILD & FLY THE miniMAX YOURSELF o Computer Designed Part 103 Ultralight Wood Construction SPECIALISTS IN CUSTOM COX TEE DEE& REED ENGINES 020S 049S 051S 074S & 09S ALL CUS TOM & STOCKPARTS VAILABLE INDIWDUALL Y COMPETITIONACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRANDS OFGLOWPLUGS HARD- TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STITT SPA RK PLUGS SILK8 COLORS QUALITYDOPEBRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUEAND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS eliminate particular problem reduce eliminate offending frequency generation first place possible limiting speed motor voltage waveformie increasing rise fall times speed control output voltage waveform Please note time takes speed control output voltage go off vice versa its necessarily related basic clock rate latter frame rate high rate exactly what Keith did particular control MOSFET gate drive resistors readily accessible increased values MOSFETS have relatively high values gate capacitance driven relatively large resistors slower switch off doing Keith effectively lowered strength eliminated offending signal frequencies causing interference technically inclined lowered values higher order Fourier coefficients motor drive waveform guess seeing myself particular offenders probably also 455 kHz just like Denniss As normal case just motor brush noise safe expect higher motor voltage cells greater also will unusual problem just described Thus general larger power systems likely have kind trouble smaller ones Whatever given established methods dealing just motor noise capacitors optocoupled controls speed control/receiver lead chokes have generally proven very effective also experience glitching mid throttle settings full throttle chances very good situation described above exists further seems either shielding receiver maybe some associated receiver wiring and/or slowing speed control transition speed should cure problem Regarding latter sufficiently knowledgeable modify own speed control Keith did don t Send manufacturer explain what think needincluding copy column feel may help Most manufacturers really savvy should both understanding willing help Indeed know least has learned great deal modeler input has incorporated design enhancements product line over years just such information Electric still growing folks No knows Before leaving topical area Id like direct attention article Robert Johnson August 1991 issue RC Report magazine article Mr Johnson also describes some basics associated motor brush noise offers solution using specific ferrite toroidal cores upon winds motor leads addition also indicates such cores serve well speed control/receiver wires similarly wound feels works well 142 Model Aviation OUR RE V-UP IN VEN AVERAGES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON VISA/MC WWII AIRCRAFT SCALE DRAWINGS & SPECIFICATION SHEETS i200'Tj~ Send $300 Scole 3 Ve Fo Cotolog Draningo RANGER FIBERGLASS RANGER FIBERGLASS CO han been Box 879 specializing n custom design moldingCampton NH fac aernopace ndosty nnce 795903223 FLYINGNEW FREE FLIGHT MICRO-4 MOTOR FOR 50 TO 70 SQUARE 11CR MODELS MARY 1K 2Sf lIT RESIGIS SUITARLE ENTIRE SYSTEM WEIGhS 20 GRAMS EVERYTHING REERED TO FLY motor nicads props switch charger partstless 3 dry celisI FREE PLAN INCLUDED else has prop decals rare kill markings AM LTON Nob od 1! GGet decalspros major decalsCoTEL 4135254110 Seed 0wFAX 413-525-7794 NORTHEAST SCREEN GRAPHICS 21 FISHER AVE EAST LONGMEADOW MA 01028 plot airfoils dot malrh prInter FOILED_AGAIN! PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING RDGE o PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY vIA INTELLIGENT EDITOR USER-FRIENDLY MENIJDRIVEN OPERATION o INCLUDES 50 AIRFOIL FILES 26-PAGE USER MANUAL $45oo picose eOCiOa ieieneiiecoi he,k dccii Por USUS Reqicoi iOMPCiXTi*T oepeiWe compel end dot nih pacon Gin composer & paOe ine hewUS odiao5 steelS 52 053 diek Seed checko neq cole CYGNET Software619 792-8021 3525 Del Mar Heights #237b San Diego 92130 chokes-in-the-leads method historically promoted column Ive recently purchased various parts recommends have yet installed evaluated operation Perhaps Ill have some results report near future Meanwhile encourage read article New Electric Products never-ending way life nice folks Hobby Lobby continually update expand Electric Goodies section famous cotalog Such process goiag write time read new catalog #18 should available asking Just call write Hobby Lobby 5614 Franldin Pike Circle Brentwood Tennessee 37027 telephone 615/373-1444 head modeler HL Jim Martin pleasure meeting KRC meet two years ago also pleasure flying several HL products Jim recently sent some photos information new additions Electric line will appear new catalog Space does permit print bit Ive included rather interesting photo month Its Solar UHU Yup Solar wing supports four ounces worth 20-solar cells supplied caption reads Fly hours Incidentally have personally flown Catalogs Best Scale $500 Model Aircraft Plans Handbook 1990-91 $500 Scale Drawings Plans Handbook $500 RC Model World Plans Const Guide $500 Catalogs $400 ta 3 shipped 885-3959 New 138 pg GERMAN PLANS BOOKS $600 Other Catalogs Please add $200 Shipped Separately THE BEST IN SCALE Over 25 Years Service Winners Toledo Master Internals & Plans Epony Glass Kits Scale Documentation British Magazine Plans VISA/ MO Antiques Military Civilian Helicoptern Salplanes 3Oee plaSOaee 3-vrew daeings PAAekicluing KOKUFAN s4ae several regular UHUsgreat airplane Now youre charged up go order new Hobby Lobby catalog tell em Bob sent ya pet peeves addition hobby dealers bad mouth Electric expression power flier implications associated routinely hear read descriptor always used lend distinction wet power fliers sort macho manner Personally draw little no distinction between Electric wet fliers regard power feel anyone does resides aeromodeling dark ages acknowledge its easier install larger wet fuel tank Electric thats point Ill yield Simply put no going tell Electric aint got enough power Besides power fliers also include fly rubber C02 compressed air solar perhaps springs steam motivation So lets knock off macho power flier comynents get 90s-style Electric aeromodeling life Incidentally power thrill-seekers may suggest read Byron Blakeslees Soaring column October Model Aviation go look Hobby Lobby catalog again Neat sounding stuffi Reader Reaction July 91 invitation comment Electric Aeromodeling Association Special Interest Group SIG within AMA has drawn near zero response exact received letter wherein reader felt knocking both EAA folks worked hard establish EAA-backed AMA Electric rules fact what felt did BRAMJER RIRCRRFT DESIGNS BRD KITS FLY BEST WS 68 -883 aqin Length 59 90 108 2C 12040 Weicht 95/1O5tb 40 S&H WS 52 1050 sqin Lehu ov 95/1 OSIb Ultimate KITS INCLUDE Epoxyglass fuse bellypan cowl cock pit lpants applicable Virgin bead foam wing cores wings 1 piece internal formers machine cut birch ACP t ply Illustrated construction manual Clear butyrate canopy Preformed T-6 aluminum landing gear Plug stab kit TO ORDER CALL 215-759-3179 VISA/MC ACCEPTED December 1991 143 PRICE 5295 PREFLIGHT TIE DOWN Heavy duty safety tie down Gray Brothers start up idling size fits models quarter scale Big Birds down Only $1650 plus $550 shipping & handling combination soft fuel resistant foam padding heavy gage steel make unit valuable preflight tools Send check Gray Brothers money order Stamping 8 Machine Inc 424 West Chicago Road West Pigeon MI 49099 FOX 2-4 Cycle Special Glow Plug 40702 Miracle Plug totally new concept glow plug design Instead using idle bar MIRACLE PLUG built pre-combustion chamber important thing glow plug retains heat better other glow plug know Try notice much smoother motor responds throttle commands Also will probably able fly less intro fuel Try low intro fuel wouldnt rev-out before Tests also show reduced fuel consumption cases WARNING! motor will probably idle faster re-set throttle erwise might able land Hard believe rse check out MIRACLE PLUG case Youll love FLY AMERICAN *** FLY FOX FOX MANUFACTURINO COMPANY July column simply invite reader feelings about EAA idea posing query came few readers incidentally particular some past reader letters comments questioned function value organization Some felt EAA focused interests very few E-fliers namely specializing highest possible Electric performance such may representing interests E-fliers AMA July column intended ask feelings about whether matters attendant question whether its time change EAA time 5305 Towsofl Avenue Fort Smith AR 72901 501 6461856 promised pass along results survey what Im now doing loud clear lack response view very strong message EAA Nuff said final column 1991 ends Please enclose SASE letter requesting response have good Electric fall season RC Helicopters/Jolly Continued page 53 crankshaft PLT allows re tighten prop nut removing engine machine PLT quality unit comes explicit instructions its use must warn you over torque prop-nut could cause serious damage piston connecting rod careful take easy other hand PLT looks much safer certainly desirable stuffing dowel exhaust port enginesomething Ive witnessed other fliers doing Concepts Board Systems can reached 7210 Jordan Ave Suite D37 Canoga Park CA 91303 818/999-3952 BCNU Arrow/Baxter Continued page 56 pack assembly making sure engine mounts aligned wing chord butted up landing gear sandwich assembly Build up sides engine mounts scrap balsa nose can faired spinner Install 1A6 wire pushrod add tank floor bulkheads Plank upper lower center section Install fuel tank Tail surfaces Hinge elevator used Goldberg nylon hinges Rather merely cutting slot elevator trailing edge cut shallow notches both surfaces hinges would mounted After installing hinges filled notches Model Magic Install control horn included bellcrank attach pushrod Glue fin Add fuselage sides triangular fillers top Engine installation Note engine offset Ive experimenting concept much favor foreign Combat fliers use good deal engine offsetbut no rudder offsetin straight airframe straight fin keeps airframe aligned flight path offset thrust maintains line tension combination works well model does foreign designs judging strength showing international competition 144 Model Aviation WE MAKE MIRACLES EVERY DAY 0 N m3oATh bt6 SETS oA6~ 1 aeosyeaP ----- UNA AIRCRAFTIRADIO ID LABEL SETS Identify sIrcsft per AMA safety rules Self stick labels easy apply peerraeeer Seen check set $125 plus 95 P&H $220 six sets 54 pks 195 P951 $5951 BalsadaS EneeryOses PS PaulO New York NY 10021 PINSPATCHES Ltctan rngfim L7 CUSTOM ENAMEL PINS & EMBROIDERED PATCHES MADE TO YOUR DESIGN 303 667-4940 P0 Box 1615Loveland COB0539 durable skis made lighweight aluminum feature unique steel spring holds ski rigid flight plus elevates axle above ski no modification current gear wire needed can go wheels skis seconds sides main skis also have special edge allows excellent tracking icy surfaces available three sizes can ordered trikes just mains order please send check money order MN add 6% sales tax Canada send US money order FREE SHIPPING Allow 2 weeks delivery Phone inquiries after 100 OSE 20-30 Trike2400Mains 2100 NORTHERN40 Trike2880Mains 2400 MODELING60 Trike3200Mains 2720 PRODUCTS PO Box 21181 ColumbIa Heights MN 55421 612-781-7333
Edition: Model Aviation - 1991/12
Page Numbers: 50, 51, 141, 142, 143, 144
THE ECS lists modeler month Hes Don Hartman PO Box 180 Etowah North Carolina 28729 Don would like meet up other Electric fliers Ashville-Hendersonville and/or Greenville-Spartenburg areas South Carolina Don tells far hes aware other E-oriented modeler locally lets get touch change tell im Bob sent ya Motor Noise topic covered last October column didnt plan matter soon some good new stuff has come along want share right away recently received letter reader Dennis Vollrath South Milwaukee Wisconsin Dennis described lengthy successful battle absolutely brutal motor noise problem particular installation problem wherein usual stuffoptocoupling multiple brush capacitors etc just didnt work just about same time several phone conversations well known highly respected E-flier Keith Shaw Keith having major motor noise problems particular installation well too defied normal approaches Keith solved problem though Now just happens both problems appear same basic though unusual nature can happen twice probably happening twiceperhaps some Additionally will see its probably fair call two cases motor noise problemsits just seem like motor noise problems further both problems appear same nature solutions same First some background noise situation receiver sees incident signals real intended own transmitter undesired ones noise such electric motor elsewhere Glitches Electrics can occur undesired signals win out over competing real signal transmitter receiver decodes misinformation supplying errant instructions servos fact its common observe rapid though short-lived departures intended flight path and/or hear sudden though short motor speed changes just such glitches past Ive usually referred motor-related noise radio static simple purpose conveying idea involved can matter jargon suggests Now its relatively easy imagine understand motor noise because 50 Model Aviation cRU Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Months Topics 1 Electric Connection Service 2 Motor NoiseMuch 3 New Products 4 Power Flier 5 EMFollow-up j / 4. Youre ooklng first place winner 1991 Nationals Class Electric Old Timer eventJerry Smartt Warsaw MO plene l Cleveland Viking geared 05 FAI cp bait turning 14 x 85 Aeronaut prop up 1s38 oz 650 mAh pack Climb straight up Clever wheel Idea uses lightweight plastic camera lens covers a cores metal center bushing Nice work Jerry Close-up new Astro slotted Druen com pared earlier regular brush Astro claims much cooler running brush tempera tures significantly extended brush life Solar UHU brand new Item Hobby Lobby 71-in wing support 20 solar cells weigh four oz con stantly charge six-cell pack used power Electric Outside Inside views Astros Model 1 1OA Peak Detector Charger up grade over earlier version now cludes current adjustment Charger oper ates 12-volt source accommodates four 12 cells 450 1700 mAh capacity includes voltage monItor jacks Automati cally shuts down full charge Works well auto engine running R C TRADER LINE new & used items 1 -900-933-3005 $1 75 PER MINUTE ESO INC 3953 WInters Hill Dr Atlanta Georgia 30360 404550-9456 E-fliers well aware electrical sparking commonly occurs brush-commutator interface running motor sparks contain electrical energy spread over very wide range frequencies including radio frequency channel youre flying Such interference can both transmitted through air nearby receiver well conducted through model wiring right receiver past column has shown ways deal matters Specifically properly installed capacitors motor brushes can reduce eliminate higher radio frequencies sparking Also optocoupled speed controls and/or chokes speed control receiver leads can break up conduction path approaches can very effective So didnt methods work two modelers above Just can interfering frequency content motor sparking can interfering frequency content least other place electric power systemthe speed control operation As described times before speed controls work turning motor voltage off ratio time voltage time its off determines average voltage applied motor thus its speed Electronic speed controls vary ratio way full off full vary transmitter stick position Now just happens some speed controls on/off switching very fast means takes very little time motor voltage transition occur perhaps microseconds millionths second fast switching action itself generates very high frequenciesmuch higher basic clock rate speed control operates Herein lies culpritrelated same motor brush sparking model Herein lies problem experienced two readers above Heres detail normal operation receiver designed process signals two three specific frequencies depending whether have single double conversion radio First course radio frequencyyour channel frequency intended signal arriving antenna described above addition however receivers amplify intermediate frequencies fact receiver gain found tuned IF amplifiers intermediate frequencies usually 107 mHz 455 kHz double conversion receivers just 455 kHz single conversion receivers exists offending interference December 1991 51 r Its new exciting way buy sell trade new used RC equipment ELECi SWAP MEET Weve harnessed power computerized call processing give cor nce placing want ad phone comfort easy chair systi deveb RC modelers give economical way reach RC buyers R can place ad up 20 seconds length 2 minutes ad less cost RC magazin&lineA MEET items ar items can c buy yoof ads i sk 30 40 SOARING OR TRUCKS ENGINES OR RADIOS 80 ITEMS WANTED 90 MISCELLANEOUS Continued page 141 muuuw unny pipe IS Dy MRS OWfl s columi 5 lb geared 05 cobalt-powered ship easily ioops mRli cells MK 11 x 7 prop Bill charged up over Iper Sunny scale-up lower edges W-5 again time guide remove A6 inch wood between forward sheeting notches rear sheeting notches both top bottom plywood rib should note Goldbergs sheeting % thick will still leave tiny tick notch locations after A6 inch caps has removed Once ply rib correctly shaped used cutting guide trim A6 inch away W-5 rib between front rear sheeting notches kits two W-4 ribs needed material removed rear sheeting notch main spar notch top bottom followed Cubs wing construction outlined manual except installing A6 x 14 inch cap strip material between front rear sheeting before fitting lower spar position spar glued cap strips well lower sheeting ribs modified no other changes construction necessary except adding caps top wing proper time Continued next month RC Electrics/Kopski Continued page 51 signal containing specific frequencies least likely get through receiver antenna likely get radiated signal right through non metal receiver case perhaps following wiring model now seems readers Vollrath Shaw just such problems Dennis kind enough share detail tale interference woe solved So large problem experienced glitching few feet transmitter antenna fully extended Dennis also found problem appeared partial throttle much less at full speeda seeming contradiction case motor brush noise interference Dennis dug deeper found THE AMERICAN M4DE RJL K61 metal multi mix carburetor 0-ring sealed needles Suggested Retali $16995 including muffler Two year warranty piece Hardened l Crankshaft New double baffle muffler Exceptionally durable single ring forged piston fitted hardened steel cylinder Schnuerle Ported Forged connecting rod bushed both ends 0-ring sealed Back Cover Aerospace Quality Investment Cast Crankcase Last year installed latest computer controlled machine technology now new K6 proof positive superior quality engine can produced right America affordable price Just think dont have send Dollars out country obtain Quality expect Priced just few Dollars cheapies below quality competition American Made K6 truly exceptional value Best have problem technical question factory just phone call away See favorite dealer contact us Information complete line RIL HP engines RJL Industries USA ox S Sierra Madre CA 91025 Telephone 818 359-0016 primary offending signal signal path 455 kllz receiver IF strip came conclusion using 455 kHz resonant circuit connected oscilloscope used sniffer Using Dennis found installation environment battery wiring etc etc very hot emissions frequency Most important Dennis observed offending 455 kHz noise present form bursts time related high speed switching signal speed control significant clue course full motor speed speed control output full no voltage switching occurring no interfering 455 kHz signalanother very significant observation Dennis solved problem wrapping receiver case plastic bag wrapped completely three layers household aluminum foil formed shield around case technically Faraday cage Finally plastic-bagged everything agaln metal-foiled case would touch short out anything else installation After Dennis delighted find no detectable interference problems sure sounds like metal receiver cases old have some real merit over now-popular plastic ones course another way reduce old timer perfectly proportioned modeling Curtlss Robin 049 Engines -Channel RIC 41 Wingspan Electric Power Optional $2695 no rroo Very few full scale aircraft ideally Suited model flight appealing old Curtiss Robin born spruce linen age beautifufty proportioned rubber electric glow engines Easy fun build trainer-like performance Flyline Models Catalog 505Prone 703 2739593 INE MODELS INC PO Box 2136 Fairfax VIrginia 22031 USA AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In 3 Axis Control Easy Construction TEAM INC BOX 338M BRADYVILLE TN 37026 615 765-5397 December1991 141 Dual Ball Bearings BUILD & FLY THE miniMAX YOURSELF o Computer Designed Part 103 Ultralight Wood Construction SPECIALISTS IN CUSTOM COX TEE DEE& REED ENGINES 020S 049S 051S 074S & 09S ALL CUS TOM & STOCKPARTS VAILABLE INDIWDUALL Y COMPETITIONACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRANDS OFGLOWPLUGS HARD- TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STITT SPA RK PLUGS SILK8 COLORS QUALITYDOPEBRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUEAND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS eliminate particular problem reduce eliminate offending frequency generation first place possible limiting speed motor voltage waveformie increasing rise fall times speed control output voltage waveform Please note time takes speed control output voltage go off vice versa its necessarily related basic clock rate latter frame rate high rate exactly what Keith did particular control MOSFET gate drive resistors readily accessible increased values MOSFETS have relatively high values gate capacitance driven relatively large resistors slower switch off doing Keith effectively lowered strength eliminated offending signal frequencies causing interference technically inclined lowered values higher order Fourier coefficients motor drive waveform guess seeing myself particular offenders probably also 455 kHz just like Denniss As normal case just motor brush noise safe expect higher motor voltage cells greater also will unusual problem just described Thus general larger power systems likely have kind trouble smaller ones Whatever given established methods dealing just motor noise capacitors optocoupled controls speed control/receiver lead chokes have generally proven very effective also experience glitching mid throttle settings full throttle chances very good situation described above exists further seems either shielding receiver maybe some associated receiver wiring and/or slowing speed control transition speed should cure problem Regarding latter sufficiently knowledgeable modify own speed control Keith did don t Send manufacturer explain what think needincluding copy column feel may help Most manufacturers really savvy should both understanding willing help Indeed know least has learned great deal modeler input has incorporated design enhancements product line over years just such information Electric still growing folks No knows Before leaving topical area Id like direct attention article Robert Johnson August 1991 issue RC Report magazine article Mr Johnson also describes some basics associated motor brush noise offers solution using specific ferrite toroidal cores upon winds motor leads addition also indicates such cores serve well speed control/receiver wires similarly wound feels works well 142 Model Aviation OUR RE V-UP IN VEN AVERAGES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON VISA/MC WWII AIRCRAFT SCALE DRAWINGS & SPECIFICATION SHEETS i200'Tj~ Send $300 Scole 3 Ve Fo Cotolog Draningo RANGER FIBERGLASS RANGER FIBERGLASS CO han been Box 879 specializing n custom design moldingCampton NH fac aernopace ndosty nnce 795903223 FLYINGNEW FREE FLIGHT MICRO-4 MOTOR FOR 50 TO 70 SQUARE 11CR MODELS MARY 1K 2Sf lIT RESIGIS SUITARLE ENTIRE SYSTEM WEIGhS 20 GRAMS EVERYTHING REERED TO FLY motor nicads props switch charger partstless 3 dry celisI FREE PLAN INCLUDED else has prop decals rare kill markings AM LTON Nob od 1! GGet decalspros major decalsCoTEL 4135254110 Seed 0wFAX 413-525-7794 NORTHEAST SCREEN GRAPHICS 21 FISHER AVE EAST LONGMEADOW MA 01028 plot airfoils dot malrh prInter FOILED_AGAIN! PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING RDGE o PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY vIA INTELLIGENT EDITOR USER-FRIENDLY MENIJDRIVEN OPERATION o INCLUDES 50 AIRFOIL FILES 26-PAGE USER MANUAL $45oo picose eOCiOa ieieneiiecoi he,k dccii Por USUS Reqicoi iOMPCiXTi*T oepeiWe compel end dot nih pacon Gin composer & paOe ine hewUS odiao5 steelS 52 053 diek Seed checko neq cole CYGNET Software619 792-8021 3525 Del Mar Heights #237b San Diego 92130 chokes-in-the-leads method historically promoted column Ive recently purchased various parts recommends have yet installed evaluated operation Perhaps Ill have some results report near future Meanwhile encourage read article New Electric Products never-ending way life nice folks Hobby Lobby continually update expand Electric Goodies section famous cotalog Such process goiag write time read new catalog #18 should available asking Just call write Hobby Lobby 5614 Franldin Pike Circle Brentwood Tennessee 37027 telephone 615/373-1444 head modeler HL Jim Martin pleasure meeting KRC meet two years ago also pleasure flying several HL products Jim recently sent some photos information new additions Electric line will appear new catalog Space does permit print bit Ive included rather interesting photo month Its Solar UHU Yup Solar wing supports four ounces worth 20-solar cells supplied caption reads Fly hours Incidentally have personally flown Catalogs Best Scale $500 Model Aircraft Plans Handbook 1990-91 $500 Scale Drawings Plans Handbook $500 RC Model World Plans Const Guide $500 Catalogs $400 ta 3 shipped 885-3959 New 138 pg GERMAN PLANS BOOKS $600 Other Catalogs Please add $200 Shipped Separately THE BEST IN SCALE Over 25 Years Service Winners Toledo Master Internals & Plans Epony Glass Kits Scale Documentation British Magazine Plans VISA/ MO Antiques Military Civilian Helicoptern Salplanes 3Oee plaSOaee 3-vrew daeings PAAekicluing KOKUFAN s4ae several regular UHUsgreat airplane Now youre charged up go order new Hobby Lobby catalog tell em Bob sent ya pet peeves addition hobby dealers bad mouth Electric expression power flier implications associated routinely hear read descriptor always used lend distinction wet power fliers sort macho manner Personally draw little no distinction between Electric wet fliers regard power feel anyone does resides aeromodeling dark ages acknowledge its easier install larger wet fuel tank Electric thats point Ill yield Simply put no going tell Electric aint got enough power Besides power fliers also include fly rubber C02 compressed air solar perhaps springs steam motivation So lets knock off macho power flier comynents get 90s-style Electric aeromodeling life Incidentally power thrill-seekers may suggest read Byron Blakeslees Soaring column October Model Aviation go look Hobby Lobby catalog again Neat sounding stuffi Reader Reaction July 91 invitation comment Electric Aeromodeling Association Special Interest Group SIG within AMA has drawn near zero response exact received letter wherein reader felt knocking both EAA folks worked hard establish EAA-backed AMA Electric rules fact what felt did BRAMJER RIRCRRFT DESIGNS BRD KITS FLY BEST WS 68 -883 aqin Length 59 90 108 2C 12040 Weicht 95/1O5tb 40 S&H WS 52 1050 sqin Lehu ov 95/1 OSIb Ultimate KITS INCLUDE Epoxyglass fuse bellypan cowl cock pit lpants applicable Virgin bead foam wing cores wings 1 piece internal formers machine cut birch ACP t ply Illustrated construction manual Clear butyrate canopy Preformed T-6 aluminum landing gear Plug stab kit TO ORDER CALL 215-759-3179 VISA/MC ACCEPTED December 1991 143 PRICE 5295 PREFLIGHT TIE DOWN Heavy duty safety tie down Gray Brothers start up idling size fits models quarter scale Big Birds down Only $1650 plus $550 shipping & handling combination soft fuel resistant foam padding heavy gage steel make unit valuable preflight tools Send check Gray Brothers money order Stamping 8 Machine Inc 424 West Chicago Road West Pigeon MI 49099 FOX 2-4 Cycle Special Glow Plug 40702 Miracle Plug totally new concept glow plug design Instead using idle bar MIRACLE PLUG built pre-combustion chamber important thing glow plug retains heat better other glow plug know Try notice much smoother motor responds throttle commands Also will probably able fly less intro fuel Try low intro fuel wouldnt rev-out before Tests also show reduced fuel consumption cases WARNING! motor will probably idle faster re-set throttle erwise might able land Hard believe rse check out MIRACLE PLUG case Youll love FLY AMERICAN *** FLY FOX FOX MANUFACTURINO COMPANY July column simply invite reader feelings about EAA idea posing query came few readers incidentally particular some past reader letters comments questioned function value organization Some felt EAA focused interests very few E-fliers namely specializing highest possible Electric performance such may representing interests E-fliers AMA July column intended ask feelings about whether matters attendant question whether its time change EAA time 5305 Towsofl Avenue Fort Smith AR 72901 501 6461856 promised pass along results survey what Im now doing loud clear lack response view very strong message EAA Nuff said final column 1991 ends Please enclose SASE letter requesting response have good Electric fall season RC Helicopters/Jolly Continued page 53 crankshaft PLT allows re tighten prop nut removing engine machine PLT quality unit comes explicit instructions its use must warn you over torque prop-nut could cause serious damage piston connecting rod careful take easy other hand PLT looks much safer certainly desirable stuffing dowel exhaust port enginesomething Ive witnessed other fliers doing Concepts Board Systems can reached 7210 Jordan Ave Suite D37 Canoga Park CA 91303 818/999-3952 BCNU Arrow/Baxter Continued page 56 pack assembly making sure engine mounts aligned wing chord butted up landing gear sandwich assembly Build up sides engine mounts scrap balsa nose can faired spinner Install 1A6 wire pushrod add tank floor bulkheads Plank upper lower center section Install fuel tank Tail surfaces Hinge elevator used Goldberg nylon hinges Rather merely cutting slot elevator trailing edge cut shallow notches both surfaces hinges would mounted After installing hinges filled notches Model Magic Install control horn included bellcrank attach pushrod Glue fin Add fuselage sides triangular fillers top Engine installation Note engine offset Ive experimenting concept much favor foreign Combat fliers use good deal engine offsetbut no rudder offsetin straight airframe straight fin keeps airframe aligned flight path offset thrust maintains line tension combination works well model does foreign designs judging strength showing international competition 144 Model Aviation WE MAKE MIRACLES EVERY DAY 0 N m3oATh bt6 SETS oA6~ 1 aeosyeaP ----- UNA AIRCRAFTIRADIO ID LABEL SETS Identify sIrcsft per AMA safety rules Self stick labels easy apply peerraeeer Seen check set $125 plus 95 P&H $220 six sets 54 pks 195 P951 $5951 BalsadaS EneeryOses PS PaulO New York NY 10021 PINSPATCHES Ltctan rngfim L7 CUSTOM ENAMEL PINS & EMBROIDERED PATCHES MADE TO YOUR DESIGN 303 667-4940 P0 Box 1615Loveland COB0539 durable skis made lighweight aluminum feature unique steel spring holds ski rigid flight plus elevates axle above ski no modification current gear wire needed can go wheels skis seconds sides main skis also have special edge allows excellent tracking icy surfaces available three sizes can ordered trikes just mains order please send check money order MN add 6% sales tax Canada send US money order FREE SHIPPING Allow 2 weeks delivery Phone inquiries after 100 OSE 20-30 Trike2400Mains 2100 NORTHERN40 Trike2880Mains 2400 MODELING60 Trike3200Mains 2720 PRODUCTS PO Box 21181 ColumbIa Heights MN 55421 612-781-7333
Edition: Model Aviation - 1991/12
Page Numbers: 50, 51, 141, 142, 143, 144
THE ECS lists modeler month Hes Don Hartman PO Box 180 Etowah North Carolina 28729 Don would like meet up other Electric fliers Ashville-Hendersonville and/or Greenville-Spartenburg areas South Carolina Don tells far hes aware other E-oriented modeler locally lets get touch change tell im Bob sent ya Motor Noise topic covered last October column didnt plan matter soon some good new stuff has come along want share right away recently received letter reader Dennis Vollrath South Milwaukee Wisconsin Dennis described lengthy successful battle absolutely brutal motor noise problem particular installation problem wherein usual stuffoptocoupling multiple brush capacitors etc just didnt work just about same time several phone conversations well known highly respected E-flier Keith Shaw Keith having major motor noise problems particular installation well too defied normal approaches Keith solved problem though Now just happens both problems appear same basic though unusual nature can happen twice probably happening twiceperhaps some Additionally will see its probably fair call two cases motor noise problemsits just seem like motor noise problems further both problems appear same nature solutions same First some background noise situation receiver sees incident signals real intended own transmitter undesired ones noise such electric motor elsewhere Glitches Electrics can occur undesired signals win out over competing real signal transmitter receiver decodes misinformation supplying errant instructions servos fact its common observe rapid though short-lived departures intended flight path and/or hear sudden though short motor speed changes just such glitches past Ive usually referred motor-related noise radio static simple purpose conveying idea involved can matter jargon suggests Now its relatively easy imagine understand motor noise because 50 Model Aviation cRU Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Months Topics 1 Electric Connection Service 2 Motor NoiseMuch 3 New Products 4 Power Flier 5 EMFollow-up j / 4. Youre ooklng first place winner 1991 Nationals Class Electric Old Timer eventJerry Smartt Warsaw MO plene l Cleveland Viking geared 05 FAI cp bait turning 14 x 85 Aeronaut prop up 1s38 oz 650 mAh pack Climb straight up Clever wheel Idea uses lightweight plastic camera lens covers a cores metal center bushing Nice work Jerry Close-up new Astro slotted Druen com pared earlier regular brush Astro claims much cooler running brush tempera tures significantly extended brush life Solar UHU brand new Item Hobby Lobby 71-in wing support 20 solar cells weigh four oz con stantly charge six-cell pack used power Electric Outside Inside views Astros Model 1 1OA Peak Detector Charger up grade over earlier version now cludes current adjustment Charger oper ates 12-volt source accommodates four 12 cells 450 1700 mAh capacity includes voltage monItor jacks Automati cally shuts down full charge Works well auto engine running R C TRADER LINE new & used items 1 -900-933-3005 $1 75 PER MINUTE ESO INC 3953 WInters Hill Dr Atlanta Georgia 30360 404550-9456 E-fliers well aware electrical sparking commonly occurs brush-commutator interface running motor sparks contain electrical energy spread over very wide range frequencies including radio frequency channel youre flying Such interference can both transmitted through air nearby receiver well conducted through model wiring right receiver past column has shown ways deal matters Specifically properly installed capacitors motor brushes can reduce eliminate higher radio frequencies sparking Also optocoupled speed controls and/or chokes speed control receiver leads can break up conduction path approaches can very effective So didnt methods work two modelers above Just can interfering frequency content motor sparking can interfering frequency content least other place electric power systemthe speed control operation As described times before speed controls work turning motor voltage off ratio time voltage time its off determines average voltage applied motor thus its speed Electronic speed controls vary ratio way full off full vary transmitter stick position Now just happens some speed controls on/off switching very fast means takes very little time motor voltage transition occur perhaps microseconds millionths second fast switching action itself generates very high frequenciesmuch higher basic clock rate speed control operates Herein lies culpritrelated same motor brush sparking model Herein lies problem experienced two readers above Heres detail normal operation receiver designed process signals two three specific frequencies depending whether have single double conversion radio First course radio frequencyyour channel frequency intended signal arriving antenna described above addition however receivers amplify intermediate frequencies fact receiver gain found tuned IF amplifiers intermediate frequencies usually 107 mHz 455 kHz double conversion receivers just 455 kHz single conversion receivers exists offending interference December 1991 51 r Its new exciting way buy sell trade new used RC equipment ELECi SWAP MEET Weve harnessed power computerized call processing give cor nce placing want ad phone comfort easy chair systi deveb RC modelers give economical way reach RC buyers R can place ad up 20 seconds length 2 minutes ad less cost RC magazin&lineA MEET items ar items can c buy yoof ads i sk 30 40 SOARING OR TRUCKS ENGINES OR RADIOS 80 ITEMS WANTED 90 MISCELLANEOUS Continued page 141 muuuw unny pipe IS Dy MRS OWfl s columi 5 lb geared 05 cobalt-powered ship easily ioops mRli cells MK 11 x 7 prop Bill charged up over Iper Sunny scale-up lower edges W-5 again time guide remove A6 inch wood between forward sheeting notches rear sheeting notches both top bottom plywood rib should note Goldbergs sheeting % thick will still leave tiny tick notch locations after A6 inch caps has removed Once ply rib correctly shaped used cutting guide trim A6 inch away W-5 rib between front rear sheeting notches kits two W-4 ribs needed material removed rear sheeting notch main spar notch top bottom followed Cubs wing construction outlined manual except installing A6 x 14 inch cap strip material between front rear sheeting before fitting lower spar position spar glued cap strips well lower sheeting ribs modified no other changes construction necessary except adding caps top wing proper time Continued next month RC Electrics/Kopski Continued page 51 signal containing specific frequencies least likely get through receiver antenna likely get radiated signal right through non metal receiver case perhaps following wiring model now seems readers Vollrath Shaw just such problems Dennis kind enough share detail tale interference woe solved So large problem experienced glitching few feet transmitter antenna fully extended Dennis also found problem appeared partial throttle much less at full speeda seeming contradiction case motor brush noise interference Dennis dug deeper found THE AMERICAN M4DE RJL K61 metal multi mix carburetor 0-ring sealed needles Suggested Retali $16995 including muffler Two year warranty piece Hardened l Crankshaft New double baffle muffler Exceptionally durable single ring forged piston fitted hardened steel cylinder Schnuerle Ported Forged connecting rod bushed both ends 0-ring sealed Back Cover Aerospace Quality Investment Cast Crankcase Last year installed latest computer controlled machine technology now new K6 proof positive superior quality engine can produced right America affordable price Just think dont have send Dollars out country obtain Quality expect Priced just few Dollars cheapies below quality competition American Made K6 truly exceptional value Best have problem technical question factory just phone call away See favorite dealer contact us Information complete line RIL HP engines RJL Industries USA ox S Sierra Madre CA 91025 Telephone 818 359-0016 primary offending signal signal path 455 kllz receiver IF strip came conclusion using 455 kHz resonant circuit connected oscilloscope used sniffer Using Dennis found installation environment battery wiring etc etc very hot emissions frequency Most important Dennis observed offending 455 kHz noise present form bursts time related high speed switching signal speed control significant clue course full motor speed speed control output full no voltage switching occurring no interfering 455 kHz signalanother very significant observation Dennis solved problem wrapping receiver case plastic bag wrapped completely three layers household aluminum foil formed shield around case technically Faraday cage Finally plastic-bagged everything agaln metal-foiled case would touch short out anything else installation After Dennis delighted find no detectable interference problems sure sounds like metal receiver cases old have some real merit over now-popular plastic ones course another way reduce old timer perfectly proportioned modeling Curtlss Robin 049 Engines -Channel RIC 41 Wingspan Electric Power Optional $2695 no rroo Very few full scale aircraft ideally Suited model flight appealing old Curtiss Robin born spruce linen age beautifufty proportioned rubber electric glow engines Easy fun build trainer-like performance Flyline Models Catalog 505Prone 703 2739593 INE MODELS INC PO Box 2136 Fairfax VIrginia 22031 USA AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In 3 Axis Control Easy Construction TEAM INC BOX 338M BRADYVILLE TN 37026 615 765-5397 December1991 141 Dual Ball Bearings BUILD & FLY THE miniMAX YOURSELF o Computer Designed Part 103 Ultralight Wood Construction SPECIALISTS IN CUSTOM COX TEE DEE& REED ENGINES 020S 049S 051S 074S & 09S ALL CUS TOM & STOCKPARTS VAILABLE INDIWDUALL Y COMPETITIONACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRANDS OFGLOWPLUGS HARD- TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STITT SPA RK PLUGS SILK8 COLORS QUALITYDOPEBRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUEAND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS eliminate particular problem reduce eliminate offending frequency generation first place possible limiting speed motor voltage waveformie increasing rise fall times speed control output voltage waveform Please note time takes speed control output voltage go off vice versa its necessarily related basic clock rate latter frame rate high rate exactly what Keith did particular control MOSFET gate drive resistors readily accessible increased values MOSFETS have relatively high values gate capacitance driven relatively large resistors slower switch off doing Keith effectively lowered strength eliminated offending signal frequencies causing interference technically inclined lowered values higher order Fourier coefficients motor drive waveform guess seeing myself particular offenders probably also 455 kHz just like Denniss As normal case just motor brush noise safe expect higher motor voltage cells greater also will unusual problem just described Thus general larger power systems likely have kind trouble smaller ones Whatever given established methods dealing just motor noise capacitors optocoupled controls speed control/receiver lead chokes have generally proven very effective also experience glitching mid throttle settings full throttle chances very good situation described above exists further seems either shielding receiver maybe some associated receiver wiring and/or slowing speed control transition speed should cure problem Regarding latter sufficiently knowledgeable modify own speed control Keith did don t Send manufacturer explain what think needincluding copy column feel may help Most manufacturers really savvy should both understanding willing help Indeed know least has learned great deal modeler input has incorporated design enhancements product line over years just such information Electric still growing folks No knows Before leaving topical area Id like direct attention article Robert Johnson August 1991 issue RC Report magazine article Mr Johnson also describes some basics associated motor brush noise offers solution using specific ferrite toroidal cores upon winds motor leads addition also indicates such cores serve well speed control/receiver wires similarly wound feels works well 142 Model Aviation OUR RE V-UP IN VEN AVERAGES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON VISA/MC WWII AIRCRAFT SCALE DRAWINGS & SPECIFICATION SHEETS i200'Tj~ Send $300 Scole 3 Ve Fo Cotolog Draningo RANGER FIBERGLASS RANGER FIBERGLASS CO han been Box 879 specializing n custom design moldingCampton NH fac aernopace ndosty nnce 795903223 FLYINGNEW FREE FLIGHT MICRO-4 MOTOR FOR 50 TO 70 SQUARE 11CR MODELS MARY 1K 2Sf lIT RESIGIS SUITARLE ENTIRE SYSTEM WEIGhS 20 GRAMS EVERYTHING REERED TO FLY motor nicads props switch charger partstless 3 dry celisI FREE PLAN INCLUDED else has prop decals rare kill markings AM LTON Nob od 1! GGet decalspros major decalsCoTEL 4135254110 Seed 0wFAX 413-525-7794 NORTHEAST SCREEN GRAPHICS 21 FISHER AVE EAST LONGMEADOW MA 01028 plot airfoils dot malrh prInter FOILED_AGAIN! PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING RDGE o PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY vIA INTELLIGENT EDITOR USER-FRIENDLY MENIJDRIVEN OPERATION o INCLUDES 50 AIRFOIL FILES 26-PAGE USER MANUAL $45oo picose eOCiOa ieieneiiecoi he,k dccii Por USUS Reqicoi iOMPCiXTi*T oepeiWe compel end dot nih pacon Gin composer & paOe ine hewUS odiao5 steelS 52 053 diek Seed checko neq cole CYGNET Software619 792-8021 3525 Del Mar Heights #237b San Diego 92130 chokes-in-the-leads method historically promoted column Ive recently purchased various parts recommends have yet installed evaluated operation Perhaps Ill have some results report near future Meanwhile encourage read article New Electric Products never-ending way life nice folks Hobby Lobby continually update expand Electric Goodies section famous cotalog Such process goiag write time read new catalog #18 should available asking Just call write Hobby Lobby 5614 Franldin Pike Circle Brentwood Tennessee 37027 telephone 615/373-1444 head modeler HL Jim Martin pleasure meeting KRC meet two years ago also pleasure flying several HL products Jim recently sent some photos information new additions Electric line will appear new catalog Space does permit print bit Ive included rather interesting photo month Its Solar UHU Yup Solar wing supports four ounces worth 20-solar cells supplied caption reads Fly hours Incidentally have personally flown Catalogs Best Scale $500 Model Aircraft Plans Handbook 1990-91 $500 Scale Drawings Plans Handbook $500 RC Model World Plans Const Guide $500 Catalogs $400 ta 3 shipped 885-3959 New 138 pg GERMAN PLANS BOOKS $600 Other Catalogs Please add $200 Shipped Separately THE BEST IN SCALE Over 25 Years Service Winners Toledo Master Internals & Plans Epony Glass Kits Scale Documentation British Magazine Plans VISA/ MO Antiques Military Civilian Helicoptern Salplanes 3Oee plaSOaee 3-vrew daeings PAAekicluing KOKUFAN s4ae several regular UHUsgreat airplane Now youre charged up go order new Hobby Lobby catalog tell em Bob sent ya pet peeves addition hobby dealers bad mouth Electric expression power flier implications associated routinely hear read descriptor always used lend distinction wet power fliers sort macho manner Personally draw little no distinction between Electric wet fliers regard power feel anyone does resides aeromodeling dark ages acknowledge its easier install larger wet fuel tank Electric thats point Ill yield Simply put no going tell Electric aint got enough power Besides power fliers also include fly rubber C02 compressed air solar perhaps springs steam motivation So lets knock off macho power flier comynents get 90s-style Electric aeromodeling life Incidentally power thrill-seekers may suggest read Byron Blakeslees Soaring column October Model Aviation go look Hobby Lobby catalog again Neat sounding stuffi Reader Reaction July 91 invitation comment Electric Aeromodeling Association Special Interest Group SIG within AMA has drawn near zero response exact received letter wherein reader felt knocking both EAA folks worked hard establish EAA-backed AMA Electric rules fact what felt did BRAMJER RIRCRRFT DESIGNS BRD KITS FLY BEST WS 68 -883 aqin Length 59 90 108 2C 12040 Weicht 95/1O5tb 40 S&H WS 52 1050 sqin Lehu ov 95/1 OSIb Ultimate KITS INCLUDE Epoxyglass fuse bellypan cowl cock pit lpants applicable Virgin bead foam wing cores wings 1 piece internal formers machine cut birch ACP t ply Illustrated construction manual Clear butyrate canopy Preformed T-6 aluminum landing gear Plug stab kit TO ORDER CALL 215-759-3179 VISA/MC ACCEPTED December 1991 143 PRICE 5295 PREFLIGHT TIE DOWN Heavy duty safety tie down Gray Brothers start up idling size fits models quarter scale Big Birds down Only $1650 plus $550 shipping & handling combination soft fuel resistant foam padding heavy gage steel make unit valuable preflight tools Send check Gray Brothers money order Stamping 8 Machine Inc 424 West Chicago Road West Pigeon MI 49099 FOX 2-4 Cycle Special Glow Plug 40702 Miracle Plug totally new concept glow plug design Instead using idle bar MIRACLE PLUG built pre-combustion chamber important thing glow plug retains heat better other glow plug know Try notice much smoother motor responds throttle commands Also will probably able fly less intro fuel Try low intro fuel wouldnt rev-out before Tests also show reduced fuel consumption cases WARNING! motor will probably idle faster re-set throttle erwise might able land Hard believe rse check out MIRACLE PLUG case Youll love FLY AMERICAN *** FLY FOX FOX MANUFACTURINO COMPANY July column simply invite reader feelings about EAA idea posing query came few readers incidentally particular some past reader letters comments questioned function value organization Some felt EAA focused interests very few E-fliers namely specializing highest possible Electric performance such may representing interests E-fliers AMA July column intended ask feelings about whether matters attendant question whether its time change EAA time 5305 Towsofl Avenue Fort Smith AR 72901 501 6461856 promised pass along results survey what Im now doing loud clear lack response view very strong message EAA Nuff said final column 1991 ends Please enclose SASE letter requesting response have good Electric fall season RC Helicopters/Jolly Continued page 53 crankshaft PLT allows re tighten prop nut removing engine machine PLT quality unit comes explicit instructions its use must warn you over torque prop-nut could cause serious damage piston connecting rod careful take easy other hand PLT looks much safer certainly desirable stuffing dowel exhaust port enginesomething Ive witnessed other fliers doing Concepts Board Systems can reached 7210 Jordan Ave Suite D37 Canoga Park CA 91303 818/999-3952 BCNU Arrow/Baxter Continued page 56 pack assembly making sure engine mounts aligned wing chord butted up landing gear sandwich assembly Build up sides engine mounts scrap balsa nose can faired spinner Install 1A6 wire pushrod add tank floor bulkheads Plank upper lower center section Install fuel tank Tail surfaces Hinge elevator used Goldberg nylon hinges Rather merely cutting slot elevator trailing edge cut shallow notches both surfaces hinges would mounted After installing hinges filled notches Model Magic Install control horn included bellcrank attach pushrod Glue fin Add fuselage sides triangular fillers top Engine installation Note engine offset Ive experimenting concept much favor foreign Combat fliers use good deal engine offsetbut no rudder offsetin straight airframe straight fin keeps airframe aligned flight path offset thrust maintains line tension combination works well model does foreign designs judging strength showing international competition 144 Model Aviation WE MAKE MIRACLES EVERY DAY 0 N m3oATh bt6 SETS oA6~ 1 aeosyeaP ----- UNA AIRCRAFTIRADIO ID LABEL SETS Identify sIrcsft per AMA safety rules Self stick labels easy apply peerraeeer Seen check set $125 plus 95 P&H $220 six sets 54 pks 195 P951 $5951 BalsadaS EneeryOses PS PaulO New York NY 10021 PINSPATCHES Ltctan rngfim L7 CUSTOM ENAMEL PINS & EMBROIDERED PATCHES MADE TO YOUR DESIGN 303 667-4940 P0 Box 1615Loveland COB0539 durable skis made lighweight aluminum feature unique steel spring holds ski rigid flight plus elevates axle above ski no modification current gear wire needed can go wheels skis seconds sides main skis also have special edge allows excellent tracking icy surfaces available three sizes can ordered trikes just mains order please send check money order MN add 6% sales tax Canada send US money order FREE SHIPPING Allow 2 weeks delivery Phone inquiries after 100 OSE 20-30 Trike2400Mains 2100 NORTHERN40 Trike2880Mains 2400 MODELING60 Trike3200Mains 2720 PRODUCTS PO Box 21181 ColumbIa Heights MN 55421 612-781-7333
Edition: Model Aviation - 1991/12
Page Numbers: 50, 51, 141, 142, 143, 144
THE ECS lists modeler month Hes Don Hartman PO Box 180 Etowah North Carolina 28729 Don would like meet up other Electric fliers Ashville-Hendersonville and/or Greenville-Spartenburg areas South Carolina Don tells far hes aware other E-oriented modeler locally lets get touch change tell im Bob sent ya Motor Noise topic covered last October column didnt plan matter soon some good new stuff has come along want share right away recently received letter reader Dennis Vollrath South Milwaukee Wisconsin Dennis described lengthy successful battle absolutely brutal motor noise problem particular installation problem wherein usual stuffoptocoupling multiple brush capacitors etc just didnt work just about same time several phone conversations well known highly respected E-flier Keith Shaw Keith having major motor noise problems particular installation well too defied normal approaches Keith solved problem though Now just happens both problems appear same basic though unusual nature can happen twice probably happening twiceperhaps some Additionally will see its probably fair call two cases motor noise problemsits just seem like motor noise problems further both problems appear same nature solutions same First some background noise situation receiver sees incident signals real intended own transmitter undesired ones noise such electric motor elsewhere Glitches Electrics can occur undesired signals win out over competing real signal transmitter receiver decodes misinformation supplying errant instructions servos fact its common observe rapid though short-lived departures intended flight path and/or hear sudden though short motor speed changes just such glitches past Ive usually referred motor-related noise radio static simple purpose conveying idea involved can matter jargon suggests Now its relatively easy imagine understand motor noise because 50 Model Aviation cRU Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Months Topics 1 Electric Connection Service 2 Motor NoiseMuch 3 New Products 4 Power Flier 5 EMFollow-up j / 4. Youre ooklng first place winner 1991 Nationals Class Electric Old Timer eventJerry Smartt Warsaw MO plene l Cleveland Viking geared 05 FAI cp bait turning 14 x 85 Aeronaut prop up 1s38 oz 650 mAh pack Climb straight up Clever wheel Idea uses lightweight plastic camera lens covers a cores metal center bushing Nice work Jerry Close-up new Astro slotted Druen com pared earlier regular brush Astro claims much cooler running brush tempera tures significantly extended brush life Solar UHU brand new Item Hobby Lobby 71-in wing support 20 solar cells weigh four oz con stantly charge six-cell pack used power Electric Outside Inside views Astros Model 1 1OA Peak Detector Charger up grade over earlier version now cludes current adjustment Charger oper ates 12-volt source accommodates four 12 cells 450 1700 mAh capacity includes voltage monItor jacks Automati cally shuts down full charge Works well auto engine running R C TRADER LINE new & used items 1 -900-933-3005 $1 75 PER MINUTE ESO INC 3953 WInters Hill Dr Atlanta Georgia 30360 404550-9456 E-fliers well aware electrical sparking commonly occurs brush-commutator interface running motor sparks contain electrical energy spread over very wide range frequencies including radio frequency channel youre flying Such interference can both transmitted through air nearby receiver well conducted through model wiring right receiver past column has shown ways deal matters Specifically properly installed capacitors motor brushes can reduce eliminate higher radio frequencies sparking Also optocoupled speed controls and/or chokes speed control receiver leads can break up conduction path approaches can very effective So didnt methods work two modelers above Just can interfering frequency content motor sparking can interfering frequency content least other place electric power systemthe speed control operation As described times before speed controls work turning motor voltage off ratio time voltage time its off determines average voltage applied motor thus its speed Electronic speed controls vary ratio way full off full vary transmitter stick position Now just happens some speed controls on/off switching very fast means takes very little time motor voltage transition occur perhaps microseconds millionths second fast switching action itself generates very high frequenciesmuch higher basic clock rate speed control operates Herein lies culpritrelated same motor brush sparking model Herein lies problem experienced two readers above Heres detail normal operation receiver designed process signals two three specific frequencies depending whether have single double conversion radio First course radio frequencyyour channel frequency intended signal arriving antenna described above addition however receivers amplify intermediate frequencies fact receiver gain found tuned IF amplifiers intermediate frequencies usually 107 mHz 455 kHz double conversion receivers just 455 kHz single conversion receivers exists offending interference December 1991 51 r Its new exciting way buy sell trade new used RC equipment ELECi SWAP MEET Weve harnessed power computerized call processing give cor nce placing want ad phone comfort easy chair systi deveb RC modelers give economical way reach RC buyers R can place ad up 20 seconds length 2 minutes ad less cost RC magazin&lineA MEET items ar items can c buy yoof ads i sk 30 40 SOARING OR TRUCKS ENGINES OR RADIOS 80 ITEMS WANTED 90 MISCELLANEOUS Continued page 141 muuuw unny pipe IS Dy MRS OWfl s columi 5 lb geared 05 cobalt-powered ship easily ioops mRli cells MK 11 x 7 prop Bill charged up over Iper Sunny scale-up lower edges W-5 again time guide remove A6 inch wood between forward sheeting notches rear sheeting notches both top bottom plywood rib should note Goldbergs sheeting % thick will still leave tiny tick notch locations after A6 inch caps has removed Once ply rib correctly shaped used cutting guide trim A6 inch away W-5 rib between front rear sheeting notches kits two W-4 ribs needed material removed rear sheeting notch main spar notch top bottom followed Cubs wing construction outlined manual except installing A6 x 14 inch cap strip material between front rear sheeting before fitting lower spar position spar glued cap strips well lower sheeting ribs modified no other changes construction necessary except adding caps top wing proper time Continued next month RC Electrics/Kopski Continued page 51 signal containing specific frequencies least likely get through receiver antenna likely get radiated signal right through non metal receiver case perhaps following wiring model now seems readers Vollrath Shaw just such problems Dennis kind enough share detail tale interference woe solved So large problem experienced glitching few feet transmitter antenna fully extended Dennis also found problem appeared partial throttle much less at full speeda seeming contradiction case motor brush noise interference Dennis dug deeper found THE AMERICAN M4DE RJL K61 metal multi mix carburetor 0-ring sealed needles Suggested Retali $16995 including muffler Two year warranty piece Hardened l Crankshaft New double baffle muffler Exceptionally durable single ring forged piston fitted hardened steel cylinder Schnuerle Ported Forged connecting rod bushed both ends 0-ring sealed Back Cover Aerospace Quality Investment Cast Crankcase Last year installed latest computer controlled machine technology now new K6 proof positive superior quality engine can produced right America affordable price Just think dont have send Dollars out country obtain Quality expect Priced just few Dollars cheapies below quality competition American Made K6 truly exceptional value Best have problem technical question factory just phone call away See favorite dealer contact us Information complete line RIL HP engines RJL Industries USA ox S Sierra Madre CA 91025 Telephone 818 359-0016 primary offending signal signal path 455 kllz receiver IF strip came conclusion using 455 kHz resonant circuit connected oscilloscope used sniffer Using Dennis found installation environment battery wiring etc etc very hot emissions frequency Most important Dennis observed offending 455 kHz noise present form bursts time related high speed switching signal speed control significant clue course full motor speed speed control output full no voltage switching occurring no interfering 455 kHz signalanother very significant observation Dennis solved problem wrapping receiver case plastic bag wrapped completely three layers household aluminum foil formed shield around case technically Faraday cage Finally plastic-bagged everything agaln metal-foiled case would touch short out anything else installation After Dennis delighted find no detectable interference problems sure sounds like metal receiver cases old have some real merit over now-popular plastic ones course another way reduce old timer perfectly proportioned modeling Curtlss Robin 049 Engines -Channel RIC 41 Wingspan Electric Power Optional $2695 no rroo Very few full scale aircraft ideally Suited model flight appealing old Curtiss Robin born spruce linen age beautifufty proportioned rubber electric glow engines Easy fun build trainer-like performance Flyline Models Catalog 505Prone 703 2739593 INE MODELS INC PO Box 2136 Fairfax VIrginia 22031 USA AFTER YOU DID ALL THE WORK WHY LET YOUR AIRPLANE DO ALL THE FLYING INFO $500 AWARDED Grand Champion Reserve Grand Champion Ultralight 1989 Sun-N-Fun Fly-In 3 Axis Control Easy Construction TEAM INC BOX 338M BRADYVILLE TN 37026 615 765-5397 December1991 141 Dual Ball Bearings BUILD & FLY THE miniMAX YOURSELF o Computer Designed Part 103 Ultralight Wood Construction SPECIALISTS IN CUSTOM COX TEE DEE& REED ENGINES 020S 049S 051S 074S & 09S ALL CUS TOM & STOCKPARTS VAILABLE INDIWDUALL Y COMPETITIONACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OFFUEL TUBING THREE BRANDS OFGLOWPLUGS HARD- TO-FIND HARD WARE OLD TIMER SUPPLIES COILS CONDENSERS NGK& STITT SPA RK PLUGS SILK8 COLORS QUALITYDOPEBRUSHES 5& 7LOOP 1/4RUBBER BANDS TRANSISTORIGNITIONSYSTEMS RESISTOR HIGH TENSION LEADS 1/2A TEXACO PLA YBOYSR KIT 1/2A TEXACO ENGINES & PARTS KSB & IGNITION TIMERS RUBBER POWER KITS PROPS TISSUEAND OTHER SUPPLIES CYANOACRYLA TES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $300 STOCK ORDERS SHIPPED WITHIN 24 HRS eliminate particular problem reduce eliminate offending frequency generation first place possible limiting speed motor voltage waveformie increasing rise fall times speed control output voltage waveform Please note time takes speed control output voltage go off vice versa its necessarily related basic clock rate latter frame rate high rate exactly what Keith did particular control MOSFET gate drive resistors readily accessible increased values MOSFETS have relatively high values gate capacitance driven relatively large resistors slower switch off doing Keith effectively lowered strength eliminated offending signal frequencies causing interference technically inclined lowered values higher order Fourier coefficients motor drive waveform guess seeing myself particular offenders probably also 455 kHz just like Denniss As normal case just motor brush noise safe expect higher motor voltage cells greater also will unusual problem just described Thus general larger power systems likely have kind trouble smaller ones Whatever given established methods dealing just motor noise capacitors optocoupled controls speed control/receiver lead chokes have generally proven very effective also experience glitching mid throttle settings full throttle chances very good situation described above exists further seems either shielding receiver maybe some associated receiver wiring and/or slowing speed control transition speed should cure problem Regarding latter sufficiently knowledgeable modify own speed control Keith did don t Send manufacturer explain what think needincluding copy column feel may help Most manufacturers really savvy should both understanding willing help Indeed know least has learned great deal modeler input has incorporated design enhancements product line over years just such information Electric still growing folks No knows Before leaving topical area Id like direct attention article Robert Johnson August 1991 issue RC Report magazine article Mr Johnson also describes some basics associated motor brush noise offers solution using specific ferrite toroidal cores upon winds motor leads addition also indicates such cores serve well speed control/receiver wires similarly wound feels works well 142 Model Aviation OUR RE V-UP IN VEN AVERAGES OVER 9000 PROPS I! IMMEDIA TESHIPMENTON VISA/MC WWII AIRCRAFT SCALE DRAWINGS & SPECIFICATION SHEETS i200'Tj~ Send $300 Scole 3 Ve Fo Cotolog Draningo RANGER FIBERGLASS RANGER FIBERGLASS CO han been Box 879 specializing n custom design moldingCampton NH fac aernopace ndosty nnce 795903223 FLYINGNEW FREE FLIGHT MICRO-4 MOTOR FOR 50 TO 70 SQUARE 11CR MODELS MARY 1K 2Sf lIT RESIGIS SUITARLE ENTIRE SYSTEM WEIGhS 20 GRAMS EVERYTHING REERED TO FLY motor nicads props switch charger partstless 3 dry celisI FREE PLAN INCLUDED else has prop decals rare kill markings AM LTON Nob od 1! GGet decalspros major decalsCoTEL 4135254110 Seed 0wFAX 413-525-7794 NORTHEAST SCREEN GRAPHICS 21 FISHER AVE EAST LONGMEADOW MA 01028 plot airfoils dot malrh prInter FOILED_AGAIN! PLOT AIRFOILS IN ANY CHORD UP TO 24 INCHES MODIFY THICKNESS CAMBER & TRAILING RDGE o PLOT SKIN THICKNESS FOR SHEETED WINGS ENTER DATA EASILY vIA INTELLIGENT EDITOR USER-FRIENDLY MENIJDRIVEN OPERATION o INCLUDES 50 AIRFOIL FILES 26-PAGE USER MANUAL $45oo picose eOCiOa ieieneiiecoi he,k dccii Por USUS Reqicoi iOMPCiXTi*T oepeiWe compel end dot nih pacon Gin composer & paOe ine hewUS odiao5 steelS 52 053 diek Seed checko neq cole CYGNET Software619 792-8021 3525 Del Mar Heights #237b San Diego 92130 chokes-in-the-leads method historically promoted column Ive recently purchased various parts recommends have yet installed evaluated operation Perhaps Ill have some results report near future Meanwhile encourage read article New Electric Products never-ending way life nice folks Hobby Lobby continually update expand Electric Goodies section famous cotalog Such process goiag write time read new catalog #18 should available asking Just call write Hobby Lobby 5614 Franldin Pike Circle Brentwood Tennessee 37027 telephone 615/373-1444 head modeler HL Jim Martin pleasure meeting KRC meet two years ago also pleasure flying several HL products Jim recently sent some photos information new additions Electric line will appear new catalog Space does permit print bit Ive included rather interesting photo month Its Solar UHU Yup Solar wing supports four ounces worth 20-solar cells supplied caption reads Fly hours Incidentally have personally flown Catalogs Best Scale $500 Model Aircraft Plans Handbook 1990-91 $500 Scale Drawings Plans Handbook $500 RC Model World Plans Const Guide $500 Catalogs $400 ta 3 shipped 885-3959 New 138 pg GERMAN PLANS BOOKS $600 Other Catalogs Please add $200 Shipped Separately THE BEST IN SCALE Over 25 Years Service Winners Toledo Master Internals & Plans Epony Glass Kits Scale Documentation British Magazine Plans VISA/ MO Antiques Military Civilian Helicoptern Salplanes 3Oee plaSOaee 3-vrew daeings PAAekicluing KOKUFAN s4ae several regular UHUsgreat airplane Now youre charged up go order new Hobby Lobby catalog tell em Bob sent ya pet peeves addition hobby dealers bad mouth Electric expression power flier implications associated routinely hear read descriptor always used lend distinction wet power fliers sort macho manner Personally draw little no distinction between Electric wet fliers regard power feel anyone does resides aeromodeling dark ages acknowledge its easier install larger wet fuel tank Electric thats point Ill yield Simply put no going tell Electric aint got enough power Besides power fliers also include fly rubber C02 compressed air solar perhaps springs steam motivation So lets knock off macho power flier comynents get 90s-style Electric aeromodeling life Incidentally power thrill-seekers may suggest read Byron Blakeslees Soaring column October Model Aviation go look Hobby Lobby catalog again Neat sounding stuffi Reader Reaction July 91 invitation comment Electric Aeromodeling Association Special Interest Group SIG within AMA has drawn near zero response exact received letter wherein reader felt knocking both EAA folks worked hard establish EAA-backed AMA Electric rules fact what felt did BRAMJER RIRCRRFT DESIGNS BRD KITS FLY BEST WS 68 -883 aqin Length 59 90 108 2C 12040 Weicht 95/1O5tb 40 S&H WS 52 1050 sqin Lehu ov 95/1 OSIb Ultimate KITS INCLUDE Epoxyglass fuse bellypan cowl cock pit lpants applicable Virgin bead foam wing cores wings 1 piece internal formers machine cut birch ACP t ply Illustrated construction manual Clear butyrate canopy Preformed T-6 aluminum landing gear Plug stab kit TO ORDER CALL 215-759-3179 VISA/MC ACCEPTED December 1991 143 PRICE 5295 PREFLIGHT TIE DOWN Heavy duty safety tie down Gray Brothers start up idling size fits models quarter scale Big Birds down Only $1650 plus $550 shipping & handling combination soft fuel resistant foam padding heavy gage steel make unit valuable preflight tools Send check Gray Brothers money order Stamping 8 Machine Inc 424 West Chicago Road West Pigeon MI 49099 FOX 2-4 Cycle Special Glow Plug 40702 Miracle Plug totally new concept glow plug design Instead using idle bar MIRACLE PLUG built pre-combustion chamber important thing glow plug retains heat better other glow plug know Try notice much smoother motor responds throttle commands Also will probably able fly less intro fuel Try low intro fuel wouldnt rev-out before Tests also show reduced fuel consumption cases WARNING! motor will probably idle faster re-set throttle erwise might able land Hard believe rse check out MIRACLE PLUG case Youll love FLY AMERICAN *** FLY FOX FOX MANUFACTURINO COMPANY July column simply invite reader feelings about EAA idea posing query came few readers incidentally particular some past reader letters comments questioned function value organization Some felt EAA focused interests very few E-fliers namely specializing highest possible Electric performance such may representing interests E-fliers AMA July column intended ask feelings about whether matters attendant question whether its time change EAA time 5305 Towsofl Avenue Fort Smith AR 72901 501 6461856 promised pass along results survey what Im now doing loud clear lack response view very strong message EAA Nuff said final column 1991 ends Please enclose SASE letter requesting response have good Electric fall season RC Helicopters/Jolly Continued page 53 crankshaft PLT allows re tighten prop nut removing engine machine PLT quality unit comes explicit instructions its use must warn you over torque prop-nut could cause serious damage piston connecting rod careful take easy other hand PLT looks much safer certainly desirable stuffing dowel exhaust port enginesomething Ive witnessed other fliers doing Concepts Board Systems can reached 7210 Jordan Ave Suite D37 Canoga Park CA 91303 818/999-3952 BCNU Arrow/Baxter Continued page 56 pack assembly making sure engine mounts aligned wing chord butted up landing gear sandwich assembly Build up sides engine mounts scrap balsa nose can faired spinner Install 1A6 wire pushrod add tank floor bulkheads Plank upper lower center section Install fuel tank Tail surfaces Hinge elevator used Goldberg nylon hinges Rather merely cutting slot elevator trailing edge cut shallow notches both surfaces hinges would mounted After installing hinges filled notches Model Magic Install control horn included bellcrank attach pushrod Glue fin Add fuselage sides triangular fillers top Engine installation Note engine offset Ive experimenting concept much favor foreign Combat fliers use good deal engine offsetbut no rudder offsetin straight airframe straight fin keeps airframe aligned flight path offset thrust maintains line tension combination works well model does foreign designs judging strength showing international competition 144 Model Aviation WE MAKE MIRACLES EVERY DAY 0 N m3oATh bt6 SETS oA6~ 1 aeosyeaP ----- UNA AIRCRAFTIRADIO ID LABEL SETS Identify sIrcsft per AMA safety rules Self stick labels easy apply peerraeeer Seen check set $125 plus 95 P&H $220 six sets 54 pks 195 P951 $5951 BalsadaS EneeryOses PS PaulO New York NY 10021 PINSPATCHES Ltctan rngfim L7 CUSTOM ENAMEL PINS & EMBROIDERED PATCHES MADE TO YOUR DESIGN 303 667-4940 P0 Box 1615Loveland COB0539 durable skis made lighweight aluminum feature unique steel spring holds ski rigid flight plus elevates axle above ski no modification current gear wire needed can go wheels skis seconds sides main skis also have special edge allows excellent tracking icy surfaces available three sizes can ordered trikes just mains order please send check money order MN add 6% sales tax Canada send US money order FREE SHIPPING Allow 2 weeks delivery Phone inquiries after 100 OSE 20-30 Trike2400Mains 2100 NORTHERN40 Trike2880Mains 2400 MODELING60 Trike3200Mains 2720 PRODUCTS PO Box 21181 ColumbIa Heights MN 55421 612-781-7333