Radio Control: Electrics

WELCOME Electric Connection Service being well received Look Lloyd Schultz 270 Middlesex Ave Metuch en NJ 08840 tel 1-201/548-2343 member ofand sole Electric flier inthe Edison Recrea tional Model Airplane Club ERMAC flies Camp Kilmer Edison NJ Lloyd flies UHU Aero Lectric has interesting story about latter Club rules require check flight begin ning pilot get club blue card OK fly unsupervised flight exam front two club members requires ROG takeoff climbout 1800 turn low pass downwind over runway climb loop horizontal eight land ing hard-surfaced runway club has similar green sticker requirements totally agree fully support kind flight 1 exam Everyones better off Anyway Lloyd did first try Aero Lectric using supplied motor six cells sounds like hes ready move up Midwest Electric Hots Whatever Lloyd now anxious share Electric Elation others Edisonarea Electric folks go get connected Lloyd Jay Putt 123 Sheep Pasture Rd Setauket NY 11733 tel 1-516/689-6420 [home] 1-516/ 575-5813 [work] wrote avail himself ECS has extra special offer con tacting him seems Jay has potential access Electric-only flying site needs others help realize potential effect Jay says Electric group could possibly have use parcel Suffolk County open space land purpose flying environmentally safe ie Electric model planes So Jay needs connect others area become group personally dont know Jay though like him cause said nice things about column hes friends fellow flier persons knownamely Larry Sribnick Mr SR Batteries George Myers MAs Radio Technique columnist sounds like poten tially great opportunity Jon Auer 7012 Bareliff Dr Charlotte NC 28212 tel 1-704/563-1585 beginning flier interested Electric RC CL didnt say anything about flies can con tact him find outor invite him field might interested know get few letters year folks expressing inter est Electric CL Electric FF well certainly dont mind offering ECS lat ter interests know RC column modeling modeling Electric great mod eling RC CL FF Just let know folks Next friend Bob Afflerback 123 Har rington Circle Willingboro NJ 08046 also wants Electrically connect others area Ive met Bob local meets past know has real keen interest quietpowered flight show what mean Bob has geared 40 Dirty Birdy OK Now heres Larry Peters 248 E Howard St Clayton NJ 08312 tel 1-609/881-1404 telling has access very large field plus another adequate school field very anxious share resources other Electric modelers beginning look like ECS turning Field Connection Service well should make lot people happy Also seems month New Jersey has definite edge loners know experience loners everywhere So lets hear ya An Electric fun fly sponsored Livingston Co RC Club Howell MI will held May 20 1990 will fourth annual appearance event CD Keith Clark 2140 E Highland Rd Howell MI 48843 tel 1-517/5462462 Keith tells last years meet larg est Michigan 50 registrants hes looking forward growth year 44 Model Aviation Radio Control Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 THIS MONTHS TOPICS 1 Electric Connection Service five names 2 Scheduled Electric meetMichigan 3 Speed Controls BEC review new info 4 Some personal Electric trivia else Woody Blanchard Hampton VA would build six-motor Latecoere 631 flying boat Power six Astro 35 cobalt motors turning 7 x 4 props 28 SR Batteries 1 250s seriestotal power input about 500 watts Model spans 100 75 long All-up weight 8 lb 3 oz Woody doesnt know yet will ROW open water area hadnt thawed out photo taken Nonscale landing gear landplane flying Geared cobalt 15 installation Bobs Senior Senior Skyvolt battery compartment can Skyvolt Theres enough room motors up hold up 24 cells installation uses 14 cobalt 40 size Motor mounting cells two visible arranged get Bobs invention padded V-block pair planes CG right Leftover space filled straps cut Gold-N-Rod inners foam blocks keep cells place strip black saddle tape stuck be- also force cooling air up around cells tween clamps motor adds bite wing mounted coolong air exits via keep geared motor rotating opening rear fuselage Wire mount under high-torque conditions nuts interconnect subpacks Ni-Cd cells Nose Bobs new basic trainer shows V block motor mount wIth lots rIght thrust time hell use rubberbands hold mo tor placeto reduce chances bendIng motor shafts beginners make bad land ings Large open nose lets lots cooling air well giving easy access motor Scheduled events include Up/Last Down Maxi-Flight Most Loops some addi tional activities planning Ive met Keith KRC meet past years hes dedicated person Im sure can count haying great meet Keith control way events planned Living ston clubs meet also flown 89 KRC Electric Fly can see results January 90 issue MA will no doubt help planning Michigan blast Speed controls BECs battery eliminator circuitryreader input Reader reac tion December 89 column related Writ ings respect speed controls continues come may interest know ma jority reaction December issue has form Thanks Now gotta tell yathis makes feel just great entire purpose column promote Electric help although get great deal personal fun out writing Thus its very nice know purpose indeed being realized appreci atedContinued page 164 TIEROFILES AND SUPPLIES FOR ELECTRIC FLIGHT SM5 6 cells 40 amps SM4 7 23 cells 50 amps Sc6 24 34 cells 60 amps -all throttles linear proportional forward only#15 WIRE 350 STRAND 020 25 sIze #12 WIRE 665 STRAND 25 100 sIze 1w aada6te 46/ Call write JOMAR 513-474-0985 2028 Knightsbridge Dr Cincinnati OH 45244 May 1990 45 ositer iook trainers motor mountIng block Saddle padded 1A foam cush ion tape Wire hooks rubberbands B&P Associates Gives Total Fligbt Line FREEDOM new electnc starter battery pack cuts cord has always tied starter power panel Discover freedom being able start plane wherever added safety less wire get caught prop charge hefty 4 Amp/hour pack will take through weekend flying power enough spare dont stop have Ni-Cads virtually evary size battery needs call writeimaginable tQ cut experimenter B&P Associates PO Box 22054you free design whatever takes Waco TX 76702-2054 817662-5587make yours best setup field mounted motor awaIts installation nose Bobs new Electric RC basic trainer CANOPY Giant 9S x 16 vinyl clad nylon canopy Red 0 Blue White Color combo g5ipIusuPs 1-3/8 rugged pipe frame 10 easy out steel tent stakes nylon guys Folds neat heavy duty cardboard box goes up quickly complete instructions OhioOptional name city state printed ends 0 order canopy request additional information call write OHIO SUPERSTAR PRODUCTS Inc 216-223-1950 sr11376 Rldgeway Road Kensington ohio 44427 PreBuilt MV-i Typhoon * Designed Ron Chidgey *1 000/o Gator RIG Products Components wing/stab tubes & adjusters canopy & cowl * 1000/a built up construction precision jigs * Bob Violetts Magnalite GB 125 used formers * Satisfaction Guaranteed WOODORAINS INC Rt 9 Box 122 Gumming GA 30130 404-889-4758 Tim Megan Richardson Ga Residents Add 6% Sales Tax HIGH QUALITY ULTRA SWITCH HARNESS Gold contacts inside switch AJI connectors manufactured Futaba Ultra low profile actuator Positive lock Mounting simply requires drill ing 1/4 inch hole * 100% tested custom cable lengths availbie upon request minimal cost ULTRA SWITCH HARNESS $1995 PLUS $250 SHIPPING & HANDLING Custom Tronics new company dedicated solely manufacture electronic prod ucts custom-designed gadgetry RC modeler offering system interested clubs Send stamped pread dressed business size # 11 envelope Cus tom Tronics PO Box 6151 Katy TX 77491 Telephone 1-713/855-6677 envelope will also receive first edition catalog companys brand-new product linefree RC Aerobatics/Van Putte Continued page 41 best pilot cannot win team trials inade quate airplane Am feeling properly chastised really since t still dont think biplane will ever truly competitive Pattern really believe biplanes aerodynamically inferior monoplanes mentioned March column another part reason prejudice will very hard convince some judges biplane can really perform Pattern maneuvers well judge team selection finals first impression Tonys Fyg-Leaf was trying make statement con vince airplane could fly maneu vers described rule book force myself ohjective believe t successful Tony earned scores gave him judge notable excep tion scores generally low relative rest judges However scores suddenly high relative rest judges Tonys biplane flew judge liked bi planes Boy cant wait get some mail biplane controversy RC Giant Scale/de Vries Continued page 43 tail surfaces looked rather small enlarged regain same areas Senior Kadet Bob used 45 power tate la mented Kadet figured new semiscale Spirit might need go installed Fox 60 uncovered form engine spinner wheels resulting model weighs 6 lb Bob estimates itll tip scales nine pounds ready fly aluminum Mono Kote covering Bob Hansons Spirit St Louis striking semiscale Giant No would ever imagine its basically Sig Senior Kadet price three-view bit balsa ply hes pro duced outstanding Scale model Hes commended skill insight Back next month RC Electrics/Kopski Continued page 45 may have missed col umn dealt differences between two cat egories speed controls frame-rate high-rate designs column showed total power system efficiency can dramatically influenced types used particular test results presented clearly show high-rate technology way goby big marginin applications speed control truly used way What mean have plane flown speed control controlling speed throughout flight opposed being used on/off device youre much better off avoid ing frame-rate designs sounds interest go find copy December 89 issue Related columns October 89 Janu ary 90 issues Other recent reader reaction includes varied comments BEC battery eliminator cir cuits topic also discussed recent columns BEC products use motor battery provide operating voltage receiver/servo system Aircraft versions intended automatically shut down motor still enough battery reserve safely run receiver Reader comments BEC mixed Several wrote expressing satisfaction BEC prod uct theyre using others quite oppo site say latter case crashed planes rea son negative reaction reader partic ular cautioned about using some RC car controls planesbecause BEC designs may al low flight-time margin very successful BEC-equipped product popular Futaha Elec tric receiver receiver also includes builtin frame-rate speed control recommendation dont know sure BEC product works well air plane dont use Personally Im staying separate receiver batteries speed controls now Another topic interest concern has 164 Model Aviation PLUS SIePP WJG & HANDLING Satisfaction Guaranteed SH-710 Pkg 24-$2 95 EAv HINEE THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 74e e4t /a9e4 /oa MFG CO INC.401-7 So Front St.Montezuma IA 50171 23-5154 0- SUPERTANKS & SUPERMUFFLERS ZINGER WOOD PROPS GIANT SCALE RIO PLANS UJ RA RT NEODESHA KS 66757 316325-2821 DEALERS CALL SEND $100 FOR COMPLETE CATALOG PO Box 16621 Dept M Irvine CA 92714 714250-1107 distinction between ferrite-magnet motors cobalt-magnet ones used speed controls Over years Ive seen numerous references adverse effects ferrite magnets framerate speed controls particular seems some folks have experienced least con vinced its what has happened low-rate con trols causing demagnetization ferrite magnets high-power applications said happen because high-amplitude repetitive current pulses present motor circuit framerate controls High-rate controls have same high-current pulses See De cember 89 January 90 editions col umn Further held cobalt magnets suffer such adverse effects simply because much harder demagnetize samarium cobalt beyond very high motor temperatures can result frame-rate oper ation also very hard ferrite much less cobalt fairness must say Ive personally experienced problems ferrites lowrate controls 10-year-old J-3 Cub has em both other hand Ive run very high power levels read current levels such stallations think just didnt have right conditions ferrite deterioration occur Whatever Im going high-rate way motors cobaltbut cluded bit because wanted aware topical area Now heres something speed control manufacturersand serious fliers well Last month referenced reader Steve Hageman comments high high rate should month want pass along fering hes made consider very significant First some introduction speed controls no matter typehave diodes connected across motor purpose suppressing high-voltage spikes polarity opposite ing applied purpose prevent dam age speed control MOSFETs metal-oxide semiconductor field-effect transisrorsRMcM earlier days diodes often stalled right motor However nowadays know installed speed control High-rate controls however present addi tional special demand diodes case high-rate circuits diodes must rated same current motor current full load Now Steve has pointed out real ize should obvious anyone having some fa miliarity switch-mode power conversion circuit operationbut admit missed myself Anyway implications can very signifi cant example given high currents flow ing Electric installations addition ally important diodes lowforward-drop variety Schottky similar keep diode losses minimum generally means both physically larger diodes costly ones well guess what have strong feeling no hard facts high-rate controls Ive seen dont have proper diodes about some input industry Anyway now have focus can just imagine what happened lot unexplained motor control failures An ordinary diode such used frame-rate control highrate control gets hot fails opened diode immediately ceases protect MOSFETs Continued page 168 PRECISION MODEL PRODUCTS Made USA BARSTOCK ALUMINUM SPINNERS ParI NoSize TT-150-B .. 1-1/2 TT-175-B .. 1-314 TT-200-6 TT-225-B .. 2-114 TT-226-B .. 2-114 IFAII . TT-250-B .. 2-112 77-251-B . 2-112 IFAJI .. 77-275-B . 2-314 77-276-B 314 IFAII .. 77-300-B 3 77-301-BIFAI 7T-325-B 114 7T-350-5 . 3-112 TT-375-B .. 3-314 TT-400-B RetailAppras PriceWeighl S1395058 oz 1495095 oz 1595100 oz 1695160 oz 1895150 ez 1895190 oz 2095170 az 2295220 az 2495200 az 2695260 oz 2895250 ez 3695340 oz 4995470 az 5995520 oz 6995570 az 3 Pieces Cone Back Plale Retainer Screw Nole 3 4 Blade Spinners Available Sizes Add $300 Per Spinner Part NoSize TT-140-A .114-28 TT-147-A 2817mm TT-610-A 0mm 77-710-A 10mm 77-516-A . . 5116-24. 77-518-A . -2418mm 77-810-A x 10mm 7T-825-A .. 8 x 125mm TT-375-A 24 TT-125-A 125mm RetailApprox PriceWeight S495061 oz 495061oz 495. 063oz 495082az 495 oz 495 076 495 076 oz 495 075 595 117 oz 595115 oz 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 May 1990 165 CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$l100 Send SASE Information additional sizes products Add S3OO shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order IiiiiThe source lightweight materials PROP NUT ADAPTORS V HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 CAL 415 783-4868 Out CAL 800 482-8663 announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT TATONE PRODUCTS CORP motor voltage spikes arid presto go devices too Yup 1 can see happen ing about scenario industry get responses concerns Ill happy share everyone future col umns Meanwhile thank Steve lengthy professional response De cember 89 column Another thought motors have capacitors mounted brush terminals Usu ally physically small ceramic Mylar polystyrene capacitors ie ones relatively low value normally ranging 0001 005 microfarads However Ive seen some folks us ing large oneselectrolytic capacitors several microfarads suggest nor use large-value capacitors using high-rate controls Stay small-value range given above rea son speed controls supposed apply voltage motor on/off fashion Highrate controls fast capacitors nature tend disallow thisa clear significant contradiction gets worse increasing ca pacitor size same time significant increases capac itor size usually little anything reduce mo tor RFI radio frequency interference case betterand fact could worse motor capacitors 0001 001 microfarad range close out topical area month heres observation Despite rather large amount mail Ive received speed control issue zane has come manufacturers what thought would happen wrote last Decembers column Im including tidbit cause several readers also thought did Whatever please remember everyone sole purpose help matters Electric Heres some personal Electric trivia share includes year ago January 1 began keeping better mail log now year has passed can tell received over 371 letters 1989 say over because did fail log few perhaps dozen incoifling letters over course year disk filing glitches Any way just thought youd like know much write Beyond however number above also indicative much write nearly letter answered Some did want reply seems like Ive answered quickly enough please keep above niind may seetil strange some folks think writing column life Listen folks have job too 371-letters figure combined fact people wanted needed some kind answer should make clear selfaddressed stamped envelope SASE very im portant Thai represents almost $100 postage alone last time checked weren t giving envelopes away either Please Otherwise may come time ne cessity practicality wont able re spond OK trivial tidbit Like mail log also maintain flight log fact dis cussed detail August 1984 column MAs second-ever RC Electrics column re viewing Electric flying year 1989 counted total 668 recorded Electric flights spread over 10 planes recorded mean have date flight time airborne delights written down ever get time Ill total up associated air time Anyway two 10 planes Skyvolts accumulated total 319 flights 668 real total few additional flights did get recorded throughout year due interruptions logis tics etc Also instructor pilot get fly others models quite bitincluding some wet oneswhich log could eas ily get impression like fly really like fly Electric Yup Ill move away keyboard over building board Ive got rlice Electric project mill Ill share future Please forward comment question latter SASEpretty please sugar address given column s header send letters Model Aviation address just slows things down since have forward home Pennsylvania Happy Electric Landings everyonel RC Helicopters/Jolly Continued page 48 X-Acto blade So lot Cyclone plastic plastic lot carbon reinforce ment word its tough Talking buddy Dan Melnik agreed added never seen Cyclone side frame break OUT OF THE ASHES . THE WNNERS CIRCLE PHOENIX T SPAN 132 AREA 1047 SO IN WEIGHT 727602 AJRFOIL 84061 WiNGLOAD 10 02180 FT ASPECT RATlO 1671 COMPETITION PRODUCTS 921 BIRDIE WAY APOLLO BEACH FL 55572 813 645 5171 168 Model Aviation 1989 F3C World Champion Dealer Inquires Invited BLACK SHARK TAKES MOST 5O-6J MECHANICS Light weight Epoj Glass Fuselage 5185 Painted Fuselage $425 Sport 11/C 320-H Tuie CreeK Ct San ra 95125 Tel 408-298-0311 Fax 408-298-6538 Y Dobashi MADE IN USA RC Electrics/Kopski Continued page 165 FOR ADOONAL INFORMATION BEND LSASE R/C AIRCRAFT AND HOBBY 5559 RICHMONDHOUTuN IA io56 FLY pmw*usiin FUEL FROM KINCSWAY

WELCOME Electric Connection Service being well received Look Lloyd Schultz 270 Middlesex Ave Metuch en NJ 08840 tel 1-201/548-2343 member ofand sole Electric flier inthe Edison Recrea tional Model Airplane Club ERMAC flies Camp Kilmer Edison NJ Lloyd flies UHU Aero Lectric has interesting story about latter Club rules require check flight begin ning pilot get club blue card OK fly unsupervised flight exam front two club members requires ROG takeoff climbout 1800 turn low pass downwind over runway climb loop horizontal eight land ing hard-surfaced runway club has similar green sticker requirements totally agree fully support kind flight 1 exam Everyones better off Anyway Lloyd did first try Aero Lectric using supplied motor six cells sounds like hes ready move up Midwest Electric Hots Whatever Lloyd now anxious share Electric Elation others Edisonarea Electric folks go get connected Lloyd Jay Putt 123 Sheep Pasture Rd Setauket NY 11733 tel 1-516/689-6420 [home] 1-516/ 575-5813 [work] wrote avail himself ECS has extra special offer con tacting him seems Jay has potential access Electric-only flying site needs others help realize potential effect Jay says Electric group could possibly have use parcel Suffolk County open space land purpose flying environmentally safe ie Electric model planes So Jay needs connect others area become group personally dont know Jay though like him cause said nice things about column hes friends fellow flier persons knownamely Larry Sribnick Mr SR Batteries George Myers MAs Radio Technique columnist sounds like poten tially great opportunity Jon Auer 7012 Bareliff Dr Charlotte NC 28212 tel 1-704/563-1585 beginning flier interested Electric RC CL didnt say anything about flies can con tact him find outor invite him field might interested know get few letters year folks expressing inter est Electric CL Electric FF well certainly dont mind offering ECS lat ter interests know RC column modeling modeling Electric great mod eling RC CL FF Just let know folks Next friend Bob Afflerback 123 Har rington Circle Willingboro NJ 08046 also wants Electrically connect others area Ive met Bob local meets past know has real keen interest quietpowered flight show what mean Bob has geared 40 Dirty Birdy OK Now heres Larry Peters 248 E Howard St Clayton NJ 08312 tel 1-609/881-1404 telling has access very large field plus another adequate school field very anxious share resources other Electric modelers beginning look like ECS turning Field Connection Service well should make lot people happy Also seems month New Jersey has definite edge loners know experience loners everywhere So lets hear ya An Electric fun fly sponsored Livingston Co RC Club Howell MI will held May 20 1990 will fourth annual appearance event CD Keith Clark 2140 E Highland Rd Howell MI 48843 tel 1-517/5462462 Keith tells last years meet larg est Michigan 50 registrants hes looking forward growth year 44 Model Aviation Radio Control Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 THIS MONTHS TOPICS 1 Electric Connection Service five names 2 Scheduled Electric meetMichigan 3 Speed Controls BEC review new info 4 Some personal Electric trivia else Woody Blanchard Hampton VA would build six-motor Latecoere 631 flying boat Power six Astro 35 cobalt motors turning 7 x 4 props 28 SR Batteries 1 250s seriestotal power input about 500 watts Model spans 100 75 long All-up weight 8 lb 3 oz Woody doesnt know yet will ROW open water area hadnt thawed out photo taken Nonscale landing gear landplane flying Geared cobalt 15 installation Bobs Senior Senior Skyvolt battery compartment can Skyvolt Theres enough room motors up hold up 24 cells installation uses 14 cobalt 40 size Motor mounting cells two visible arranged get Bobs invention padded V-block pair planes CG right Leftover space filled straps cut Gold-N-Rod inners foam blocks keep cells place strip black saddle tape stuck be- also force cooling air up around cells tween clamps motor adds bite wing mounted coolong air exits via keep geared motor rotating opening rear fuselage Wire mount under high-torque conditions nuts interconnect subpacks Ni-Cd cells Nose Bobs new basic trainer shows V block motor mount wIth lots rIght thrust time hell use rubberbands hold mo tor placeto reduce chances bendIng motor shafts beginners make bad land ings Large open nose lets lots cooling air well giving easy access motor Scheduled events include Up/Last Down Maxi-Flight Most Loops some addi tional activities planning Ive met Keith KRC meet past years hes dedicated person Im sure can count haying great meet Keith control way events planned Living ston clubs meet also flown 89 KRC Electric Fly can see results January 90 issue MA will no doubt help planning Michigan blast Speed controls BECs battery eliminator circuitryreader input Reader reac tion December 89 column related Writ ings respect speed controls continues come may interest know ma jority reaction December issue has form Thanks Now gotta tell yathis makes feel just great entire purpose column promote Electric help although get great deal personal fun out writing Thus its very nice know purpose indeed being realized appreci atedContinued page 164 TIEROFILES AND SUPPLIES FOR ELECTRIC FLIGHT SM5 6 cells 40 amps SM4 7 23 cells 50 amps Sc6 24 34 cells 60 amps -all throttles linear proportional forward only#15 WIRE 350 STRAND 020 25 sIze #12 WIRE 665 STRAND 25 100 sIze 1w aada6te 46/ Call write JOMAR 513-474-0985 2028 Knightsbridge Dr Cincinnati OH 45244 May 1990 45 ositer iook trainers motor mountIng block Saddle padded 1A foam cush ion tape Wire hooks rubberbands B&P Associates Gives Total Fligbt Line FREEDOM new electnc starter battery pack cuts cord has always tied starter power panel Discover freedom being able start plane wherever added safety less wire get caught prop charge hefty 4 Amp/hour pack will take through weekend flying power enough spare dont stop have Ni-Cads virtually evary size battery needs call writeimaginable tQ cut experimenter B&P Associates PO Box 22054you free design whatever takes Waco TX 76702-2054 817662-5587make yours best setup field mounted motor awaIts installation nose Bobs new Electric RC basic trainer CANOPY Giant 9S x 16 vinyl clad nylon canopy Red 0 Blue White Color combo g5ipIusuPs 1-3/8 rugged pipe frame 10 easy out steel tent stakes nylon guys Folds neat heavy duty cardboard box goes up quickly complete instructions OhioOptional name city state printed ends 0 order canopy request additional information call write OHIO SUPERSTAR PRODUCTS Inc 216-223-1950 sr11376 Rldgeway Road Kensington ohio 44427 PreBuilt MV-i Typhoon * Designed Ron Chidgey *1 000/o Gator RIG Products Components wing/stab tubes & adjusters canopy & cowl * 1000/a built up construction precision jigs * Bob Violetts Magnalite GB 125 used formers * Satisfaction Guaranteed WOODORAINS INC Rt 9 Box 122 Gumming GA 30130 404-889-4758 Tim Megan Richardson Ga Residents Add 6% Sales Tax HIGH QUALITY ULTRA SWITCH HARNESS Gold contacts inside switch AJI connectors manufactured Futaba Ultra low profile actuator Positive lock Mounting simply requires drill ing 1/4 inch hole * 100% tested custom cable lengths availbie upon request minimal cost ULTRA SWITCH HARNESS $1995 PLUS $250 SHIPPING & HANDLING Custom Tronics new company dedicated solely manufacture electronic prod ucts custom-designed gadgetry RC modeler offering system interested clubs Send stamped pread dressed business size # 11 envelope Cus tom Tronics PO Box 6151 Katy TX 77491 Telephone 1-713/855-6677 envelope will also receive first edition catalog companys brand-new product linefree RC Aerobatics/Van Putte Continued page 41 best pilot cannot win team trials inade quate airplane Am feeling properly chastised really since t still dont think biplane will ever truly competitive Pattern really believe biplanes aerodynamically inferior monoplanes mentioned March column another part reason prejudice will very hard convince some judges biplane can really perform Pattern maneuvers well judge team selection finals first impression Tonys Fyg-Leaf was trying make statement con vince airplane could fly maneu vers described rule book force myself ohjective believe t successful Tony earned scores gave him judge notable excep tion scores generally low relative rest judges However scores suddenly high relative rest judges Tonys biplane flew judge liked bi planes Boy cant wait get some mail biplane controversy RC Giant Scale/de Vries Continued page 43 tail surfaces looked rather small enlarged regain same areas Senior Kadet Bob used 45 power tate la mented Kadet figured new semiscale Spirit might need go installed Fox 60 uncovered form engine spinner wheels resulting model weighs 6 lb Bob estimates itll tip scales nine pounds ready fly aluminum Mono Kote covering Bob Hansons Spirit St Louis striking semiscale Giant No would ever imagine its basically Sig Senior Kadet price three-view bit balsa ply hes pro duced outstanding Scale model Hes commended skill insight Back next month RC Electrics/Kopski Continued page 45 may have missed col umn dealt differences between two cat egories speed controls frame-rate high-rate designs column showed total power system efficiency can dramatically influenced types used particular test results presented clearly show high-rate technology way goby big marginin applications speed control truly used way What mean have plane flown speed control controlling speed throughout flight opposed being used on/off device youre much better off avoid ing frame-rate designs sounds interest go find copy December 89 issue Related columns October 89 Janu ary 90 issues Other recent reader reaction includes varied comments BEC battery eliminator cir cuits topic also discussed recent columns BEC products use motor battery provide operating voltage receiver/servo system Aircraft versions intended automatically shut down motor still enough battery reserve safely run receiver Reader comments BEC mixed Several wrote expressing satisfaction BEC prod uct theyre using others quite oppo site say latter case crashed planes rea son negative reaction reader partic ular cautioned about using some RC car controls planesbecause BEC designs may al low flight-time margin very successful BEC-equipped product popular Futaha Elec tric receiver receiver also includes builtin frame-rate speed control recommendation dont know sure BEC product works well air plane dont use Personally Im staying separate receiver batteries speed controls now Another topic interest concern has 164 Model Aviation PLUS SIePP WJG & HANDLING Satisfaction Guaranteed SH-710 Pkg 24-$2 95 EAv HINEE THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE Easier install other hinge No gouging picking messy epoxies Simply cut single knife slot hinge slide hinges place apply few drops favorite CA glue youre done SUPER FAST SUPER EASY SUPER STRONG 74e e4t /a9e4 /oa MFG CO INC.401-7 So Front St.Montezuma IA 50171 23-5154 0- SUPERTANKS & SUPERMUFFLERS ZINGER WOOD PROPS GIANT SCALE RIO PLANS UJ RA RT NEODESHA KS 66757 316325-2821 DEALERS CALL SEND $100 FOR COMPLETE CATALOG PO Box 16621 Dept M Irvine CA 92714 714250-1107 distinction between ferrite-magnet motors cobalt-magnet ones used speed controls Over years Ive seen numerous references adverse effects ferrite magnets framerate speed controls particular seems some folks have experienced least con vinced its what has happened low-rate con trols causing demagnetization ferrite magnets high-power applications said happen because high-amplitude repetitive current pulses present motor circuit framerate controls High-rate controls have same high-current pulses See De cember 89 January 90 editions col umn Further held cobalt magnets suffer such adverse effects simply because much harder demagnetize samarium cobalt beyond very high motor temperatures can result frame-rate oper ation also very hard ferrite much less cobalt fairness must say Ive personally experienced problems ferrites lowrate controls 10-year-old J-3 Cub has em both other hand Ive run very high power levels read current levels such stallations think just didnt have right conditions ferrite deterioration occur Whatever Im going high-rate way motors cobaltbut cluded bit because wanted aware topical area Now heres something speed control manufacturersand serious fliers well Last month referenced reader Steve Hageman comments high high rate should month want pass along fering hes made consider very significant First some introduction speed controls no matter typehave diodes connected across motor purpose suppressing high-voltage spikes polarity opposite ing applied purpose prevent dam age speed control MOSFETs metal-oxide semiconductor field-effect transisrorsRMcM earlier days diodes often stalled right motor However nowadays know installed speed control High-rate controls however present addi tional special demand diodes case high-rate circuits diodes must rated same current motor current full load Now Steve has pointed out real ize should obvious anyone having some fa miliarity switch-mode power conversion circuit operationbut admit missed myself Anyway implications can very signifi cant example given high currents flow ing Electric installations addition ally important diodes lowforward-drop variety Schottky similar keep diode losses minimum generally means both physically larger diodes costly ones well guess what have strong feeling no hard facts high-rate controls Ive seen dont have proper diodes about some input industry Anyway now have focus can just imagine what happened lot unexplained motor control failures An ordinary diode such used frame-rate control highrate control gets hot fails opened diode immediately ceases protect MOSFETs Continued page 168 PRECISION MODEL PRODUCTS Made USA BARSTOCK ALUMINUM SPINNERS ParI NoSize TT-150-B .. 1-1/2 TT-175-B .. 1-314 TT-200-6 TT-225-B .. 2-114 TT-226-B .. 2-114 IFAII . TT-250-B .. 2-112 77-251-B . 2-112 IFAJI .. 77-275-B . 2-314 77-276-B 314 IFAII .. 77-300-B 3 77-301-BIFAI 7T-325-B 114 7T-350-5 . 3-112 TT-375-B .. 3-314 TT-400-B RetailAppras PriceWeighl S1395058 oz 1495095 oz 1595100 oz 1695160 oz 1895150 ez 1895190 oz 2095170 az 2295220 az 2495200 az 2695260 oz 2895250 ez 3695340 oz 4995470 az 5995520 oz 6995570 az 3 Pieces Cone Back Plale Retainer Screw Nole 3 4 Blade Spinners Available Sizes Add $300 Per Spinner Part NoSize TT-140-A .114-28 TT-147-A 2817mm TT-610-A 0mm 77-710-A 10mm 77-516-A . . 5116-24. 77-518-A . -2418mm 77-810-A x 10mm 7T-825-A .. 8 x 125mm TT-375-A 24 TT-125-A 125mm RetailApprox PriceWeight S495061 oz 495061oz 495. 063oz 495082az 495 oz 495 076 495 076 oz 495 075 595 117 oz 595115 oz 3 Pieces Nut Washer Machined Bushing Add S350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 836 SOUTH HOUSTON TEXAS 77587 713 943-1867 May 1990 165 CARBON FIBER LAMINATES Aerospace Composite Products offers variety rigid carbon fiber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$700 CL-2 014 thick 1x48-$800 1x72-$l100 Send SASE Information additional sizes products Add S3OO shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order IiiiiThe source lightweight materials PROP NUT ADAPTORS V HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 CAL 415 783-4868 Out CAL 800 482-8663 announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT TATONE PRODUCTS CORP motor voltage spikes arid presto go devices too Yup 1 can see happen ing about scenario industry get responses concerns Ill happy share everyone future col umns Meanwhile thank Steve lengthy professional response De cember 89 column Another thought motors have capacitors mounted brush terminals Usu ally physically small ceramic Mylar polystyrene capacitors ie ones relatively low value normally ranging 0001 005 microfarads However Ive seen some folks us ing large oneselectrolytic capacitors several microfarads suggest nor use large-value capacitors using high-rate controls Stay small-value range given above rea son speed controls supposed apply voltage motor on/off fashion Highrate controls fast capacitors nature tend disallow thisa clear significant contradiction gets worse increasing ca pacitor size same time significant increases capac itor size usually little anything reduce mo tor RFI radio frequency interference case betterand fact could worse motor capacitors 0001 001 microfarad range close out topical area month heres observation Despite rather large amount mail Ive received speed control issue zane has come manufacturers what thought would happen wrote last Decembers column Im including tidbit cause several readers also thought did Whatever please remember everyone sole purpose help matters Electric Heres some personal Electric trivia share includes year ago January 1 began keeping better mail log now year has passed can tell received over 371 letters 1989 say over because did fail log few perhaps dozen incoifling letters over course year disk filing glitches Any way just thought youd like know much write Beyond however number above also indicative much write nearly letter answered Some did want reply seems like Ive answered quickly enough please keep above niind may seetil strange some folks think writing column life Listen folks have job too 371-letters figure combined fact people wanted needed some kind answer should make clear selfaddressed stamped envelope SASE very im portant Thai represents almost $100 postage alone last time checked weren t giving envelopes away either Please Otherwise may come time ne cessity practicality wont able re spond OK trivial tidbit Like mail log also maintain flight log fact dis cussed detail August 1984 column MAs second-ever RC Electrics column re viewing Electric flying year 1989 counted total 668 recorded Electric flights spread over 10 planes recorded mean have date flight time airborne delights written down ever get time Ill total up associated air time Anyway two 10 planes Skyvolts accumulated total 319 flights 668 real total few additional flights did get recorded throughout year due interruptions logis tics etc Also instructor pilot get fly others models quite bitincluding some wet oneswhich log could eas ily get impression like fly really like fly Electric Yup Ill move away keyboard over building board Ive got rlice Electric project mill Ill share future Please forward comment question latter SASEpretty please sugar address given column s header send letters Model Aviation address just slows things down since have forward home Pennsylvania Happy Electric Landings everyonel RC Helicopters/Jolly Continued page 48 X-Acto blade So lot Cyclone plastic plastic lot carbon reinforce ment word its tough Talking buddy Dan Melnik agreed added never seen Cyclone side frame break OUT OF THE ASHES . THE WNNERS CIRCLE PHOENIX T SPAN 132 AREA 1047 SO IN WEIGHT 727602 AJRFOIL 84061 WiNGLOAD 10 02180 FT ASPECT RATlO 1671 COMPETITION PRODUCTS 921 BIRDIE WAY APOLLO BEACH FL 55572 813 645 5171 168 Model Aviation 1989 F3C World Champion Dealer Inquires Invited BLACK SHARK TAKES MOST 5O-6J MECHANICS Light weight Epoj Glass Fuselage 5185 Painted Fuselage $425 Sport 11/C 320-H Tuie CreeK Ct San ra 95125 Tel 408-298-0311 Fax 408-298-6538 Y Dobashi MADE IN USA RC Electrics/Kopski Continued page 165 FOR ADOONAL INFORMATION BEND LSASE R/C AIRCRAFT AND HOBBY 5559 RICHMONDHOUTuN IA io56 FLY pmw*usiin FUEL FROM KINCSWAY