Radio Technique

George M Mye D [7Radiomchnque FDATE0DI IIMA RFCHECICJ IAMA DATE0D1 Latest news 1988 RC frequencyutilization scene joint effort Radio Control Manufacturers Association RICMA AMA certification transmittersnew frequency-changed Sorry cant show seals color upper gold low er silver transmitter bearing gold seal certified narrow-band can used AMA-sanctioned competition 12 lower-band channels RC12-34 transmitter bearing silver seal certified wideband can used AMA-sanction ed competition 10 high-band channels RC38-56 Theres quite bit information months column 1988 IS HEREand what about As result FCC rules awarded us 50 exclusive RC channels aircraft 30 ex clusive channels non-aircraft face new situation beginning 1988 first change old even-numbered RC channels must abandoned 7208 7216 7224 7232 7240 7296 7564 MHz frequency flags composed col ored ribbon white ribbon As result AMA decisions related orderly development use new channels RC12 14 16 18 20 22 24 26 28 30 32 34 activated replace lost channels narrow-band transmitters transmitted signal 55 dB 20 kHz F0 required use newly activated channels ADJACENT CHANNEL SMITTERS ATNBFMNBAM OWBAMJ T2 40 kHz above XXXl FM B F0 ±20kHz T-1 20 kHz above XXXI AM B F0 ±20kHz T1 20 kHz below XXX ~BAM B F0 ±20kHz T2 40 kHzbelow XXXJ X TEST CONDITION FLSNBFM NBAM OWBAM NBFM T i- 4 Type-checkedXXX NBFM T 2 Type-checkedXXX T NEL NUMBER OF THE RC SYSTEM BEING TESTED EXAMPLE T T2 T4 New teat matrix used MyerslAberle team testing RC systems info column narrow-band transmitters can use form modulation AM FM FM/PCM types currently use However old wideband AM transmitters OWBAM have converted new frequencies still permit ted RC38-56 AMA plan does require anything done existing convened OWBAMs now have consider OWBAM well narrow-band FM NBFM AM NBAM potential sources interference copy new test matrix used Myers/Aberle team shown elsewhere column members Radio Control Manufac turers Association RCMA move clear ly delineate performance characteristics transmitters use have begun affix gold sticker transmitters exhibiting narrow-band characteristics -55 dB 20 kHz F0 silver sticker transmitters less meet original FCC Type Acceptance re quirements -35 dB Hz F0 say less because Type Acceptance re quirements cover lot just band width offset Strictly matter Myers personal opinion think RCMA will have put stick er transmitter case another sticker RF module just take care potential ar guments contests spectrum analyzer won t available settle disputes know takes both items modulator boards RF module meet spec What should YOU doand what should per suade OTHERS 1 Use narrow-band AM FM FM/PCM transmitters low-band channels RCl2 through RC34 2 DO NOT under circumstances simply crystal-swap OWBAM set new low-band channel converted OWBAM transmitter MUST have RCMA gold seal order sanctioned use AMA competition low-band channels silver seal restricts high-band channels RC38-56 No seal should bar uses including sport flying 3 In order check transmitters ready 1988 get Gold Silver seal take AMA booth RC hobby shows IMAC Northwest Model Expo WRAMs Toledo Mid-Atlantic Show RCHTA Show 1988 AMA Nats need crystal swaps and/or repairs send shop service 4 If suffer interference after completing item 3 after assuring yourself others flight line have done similarly spread Out Make use Owen Blacks Pacific Plan something equivalent set up flight lines minimize possible interference combinations doing effort create narrow-band environment RCl2-34 Theres some good news compliance front Ace R/C has shipping narrow-band trans mitters since April 1987 before stickers available Ace R/C will narrow-band Inside look two first 1991 receivers Ace RIC Model 91Lan AM unit Polks Challenger 720 Ran FM set 34 Model Aviation 70 Froelillch Farm Ed HicksvIIIe NY 11801 ABSTRACT The 1988 RC operating environ ment reviewed RCMA gold silver certifi cation labels transmitters displayed purpose significance described Some manufacturers RC senilce shops can provide listed Poiks moduleswap described Windbag discussed new way fly Frank Sailor Wind bag kit Netherlands via Savon Hobbies canard-pusher featuring inflatable wing its performance characteris tics include something Helicopter Sailplane little conventional powered plane Put together getnothing expect crystal-swap Silver Seven Olympic Proline old Digital Commander transmitters affix appropriate stickers $15 must send transmitters because both RF boards modulator board must modi fied nt just plug new RF boards Ace R/C Inc 116 W 19th St PO Box SuE Higginsville MO 64037 telephone number 816 584-7121 Airironics Inc 11 Autry Irvine CA 92718 will crystal-swap retune certify sil ver sticker OWBAM transmitter $25 want will also exchange new 92262 receiver old receiver pack age price goes $4750 New production transmitters have receiving gold silver stickers appropriate Futaba will narrow-band crystal-swap OWBAM transmitters bringing up AMA standards about $25 depends what else needs fixing affix gold RCMA stick er transmitter cant brought up narrow-band performance otherwise meets FCC standards use RC38-56 gets silver sticker otherwise no swap Futaba Corpo ration America 555 West Victoria Street Compton CA 90220 Polks Modelcraft Hobbies 346 Bergen Ave Jersey City NJ 07304 Attn Exchange Dept telephone number orders 1-800-225POLK will accept transmitter module re ceiver Aristocraft/High-Tec 420 620 720 system exchange model 720 module RCMA gold sticker 720 re ceiver $1895 plus shipping change will give 1991-capable system according tests George Steiner Bob Aberle have conductedYes said 1991 transmitter does have Channel 1-4 Mix Switch top right-hand corner must return complete transmitter well cause needs some update can exchange channel new channels RCl2-34 know two RC repair stations hard work equipped narrow-band certify converted sets 1 George Steiner doing business GSP Prod ucts Sacramento 2238 Rogue River Drive Continued page 129 Introducing PIU5LSCkTM F 020 Stainless Steel Tubing Wall Stainless Steel Spring wvund exdusIiey ft Hi-Temp Pbsitioner IMII melt used directed Direct-connection Ht-Ternp Teflon Mring NO sliding contacts corrode cause unwanted resistance during charging discharging Positiie 6-point locks will strip ar out like old 3-point brass HeadLOCIC 1650 ma/hr Fast-Charge capable stainless steel construction battety provides 35% starting powerl No need buy expensive battety cariy sparel NI-STARTER Patent #D272901 #4405890 PlugLDck Patent Pending McDaniel RIC Incorporated1 12206 Guanevere Road 301/464-2260 Telex 287901 McD-UR Glenn Dale MD 20769 USA. HAS MOVED INTO LARGER QUARTERS 21658 Cloud Way Hayward CA 94545 h CAL 415 783-4868 Out CAL 800 482-8663 March 1988 35 ~Weeproudto announce TATONE PRODUCTS CORPORATION has acquired CB ASSOCIATES PRESIDENT TATONE PRODUCTS CORP SOUTHERNS SORGHUM & FLEXALL THE STANDARDPLASTIC IZER CONTACTFOR ADHESIVEACRYLICS FORAND SHEETINGDOPES FOAM WINGS WILL NOTSTOPS ATTACKCRACKING STYROFOAMAND CORES ICHIPPING DAVE BROWN PRODUCTS 4560 Layhigh Hamilton OH 45013 513 738-1576 SEE YOUR OEALER OR OISTRIBUTOR ELECTRIC E3JNQJ3LIE& Buzz skies search RED BARON DSCs neat little stand-way-off scale model famous WA/I fighter take-offs aerobatics touch goes 40 span 275 sq area beauly 6 7 cells Simple quick build precut fuselage sides tail feathers combo includes DSC HYPERTHRUST 075 motor fused switch harness tamiya connector pro peller adaptor propeller kit 30 amperes meter determine current draw motor/propeller combination IAVEY675 TOWER LANE YSTEMSWEST CHESTEI PA I93 i oRPORATIoN looked replica Gee Bee R-1 building original factory drawings During next few days Westover able introduce Ken several mem bers Granville family came Nationals Ken met Gladys Granville Jones youngest sister five Granville brothers husband Hiram Hiram original facto ry crew did welding original Model Ys also met Norma Granville daughter Zantford Gran ville June Dakin daughter Tom Granville very pleased see Kens beautiful Gee Bee enjoyed meet ing him Im sure plane brought back some old memories Gladys hus band will never forget thrill seeing Ken lift off Westover AFB bright Sun day morning stood Gladys Hiram Norma children beauti ful sight see Gee Bee over Springfield again Thank Ken wonderful experience continued Next month construction details Radio TechniquelMyers Continued page 35 2 Pete Waters doing business Kraft Mid west 117 East Main Upper Level Northville MI 48107 Telephone 313 348-0095 hear other people similarly equipped Ill pass Yes invitation send name address type business next column may look like classified ad As said once before talk narrowbanding transmitters really talking about suppressing THE POWER TO INTERFERE Old wideband AM OWBAM transmitters have power interfere Eventually well have get rid of plan rid 1991 Because cause trouble worth Policing narrow-band channels So going make sure RCl2-34 band real ly occupied narrow-band transmitters starting 1988 nobody shifts OWBAM set new RC channel YOU ARE friend dont no else will user RC channels expected police use channels Unfortunately no gives authority FORCE anyone right thing have persuasion makes situation similar Hams among us Hams have police use Ham bands convincing other Hams use properly case non-Ham doing bad things may have call FCC ITS ALL UP TO YOU windbag change pace think might like learn different kind aircraft Windbag Modeled after real ultralight Windbag makes use inflatable wing made rip-stop nylon thing makes dif ferent Luther Huxs machine absence strings shape wing fiberglas bow shapes leading edge alr pressure com bined cut cloth does rest Frank Sailor Farmingdale NY brought Windbag its test flights totally unprepared what followed first attempt plane ran tong way down run way showing interest flying next attempt lifted off Up elevator departed steep climb right-hand bank making like U-Control model back ground am pleased video tape proves least presence mind shut down engine halfway through arc Having established did have enough control authority deal engine torque full power Frank mounted 61 kit called 40 next set up control motion possible next takeoff made part throttle full Left bank-control input Usually holds Right rudder correct torque pusher no rudder After liftoff reduced power until left turn appeared flight proceeded power setting resulting climb agonizingly slow climb level flight power setting controls quite effective seemed fly like lethargic alrplane Very little aileron stick motion required produce turn used elevator hold nose up turn canard configuration Later exper iments showed 11 x 6 propeller turning 10000 rpm produced right flight speed estimate about 40 mph Continued page 133 March 1988 129 Special Combo Price $4795 Sacramento CA 95826 telephone 910 362-1962 Radio Technique/Myers Continued page 129 Aileron control tips whole wing rela tive rest machine long distance between center lift centerof-gravity Consequently lot pendulum effect once steep turn started dont have much control authority stop Thats things get interesting found best add some power push nose down opposite roll just wait gives heart clutch engine running little sick powered down landing Thats found out didnt have enough Up control authority learned land thing somewhat like Helicopter Bring near ground add power last minute bring up nose can land main gear Crosswind landings unwise because much wing way up above wheels experiments followed result learned something about deadstick landings hangs nose low glide have dive runway order have enough control left lift nose landing glide has general characteristics par achute descent some Helicopter autorotation landing characteristics thrown spice beginners very likely keep interest awhile Windbag Flex-Foil International B V PO Box 480-7600 AL Almelo Netherlands Available Savon Hobbies 3622 North 19th Ave Miami FL 33142 Simulator/Schoenberg Continued page 37 tending out nine inches After some testing refining ex perimental simulator really worked fairly ef fectively surprisingly first trials hung Glider garage ceiling center-of-gravity about eight inches shroud produced ade quate movement right left turn signaled Too much turn however took rudder out airstream Glider stayed locked turn position solu tion tape four-inch extensions shroud sides leading edge wing would block excessive turn move ment leaving rudder still airstream could return plane its former yaw axis Pitch movement barely noticeable would have learned au naturel air Yet turns still crisp enough Aha Lets see straightening out airstream through egg-crate-type dividers wouldnt trick trip local li quor commission store provided three bot tle dividers two fitted side side nicely exit hole Taped defi nitely smoothed out rotating fanned air improved turning action Glider fellow club member Dave Gough yet turn RC transmitter ordered en route him hap pened come evening enlisted Simple Simulator project novice test pilot training system few minutes right left turns cor recting stops straight flight stopand-go S turns acquainted him what happened Gliders yaw position going away him would react coming toward him re quiring him reverse control directions left stick gave right rudder vice versa easy put him test pi lots chair moved around back carton facing Glider fan transmitter receiver switched again results favor able Responding instructors com mands right left turns Dave soon got over initial disorientation Sure usual moments confusion relatively slow-turning Glider giving him time react nerve-wracking fear hard landing crash out picture didnt have worry misstep controls could end delicate rather expensive piece equipment Sheltered vagaries real winds test pilot able concentrate improving flying skills After 20 minutes total training ver dict Now feel comfortable transmitter can start turn stop fly straight aheadand Glider both going away coming toward think Ill better able con trol model now have sim plified simulator time Hopefully Dave conservative fellow neighbor Wally Arbanas came see what action garage about drafted second test pilot Wally novice comes RC flyinghe out to field several times never attempted fly modelsbut hes experienced military pilot flew P-38s World War II first feedback got Wally turns slowly Maybe old fighter pilot reflexes case fix clearly needed Glider didnt respond fast enough him So reset rudder throw both servo control horn absolute maximum result much peppier Glider Thats like Wally told usand another novice RC pilot quickly adjusting transmitter sticks turning stopping turn directing ship flying away him mastering crucial knack guiding back towards himself Like Dave before him Wally spared traumatic disorientation commonly experienced student pilot trying cope switching stick directions Now get Wally out field hobby like experienced pilots wanted start out air plane P-38 Alas perhaps lucky him end no P-38s stock BAM members squadrons Trainers first Wally cautioned glad see him THE LEADER IN COMPETITION NEW U THP DESIGN DIAPRICE 14 15 16 NEW PRO SERIES 3 / [I i1 NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFGOFSELECTHARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIAPITCHPRICE 534 634 72833h456 8334568 84566/7 9456677A 1045667 106W8W 106EW 114677778 II5W 116EW 1167 124W 12SW 1256 1356 1456 1556 164N 16678 RC PYLON RACING SERIES 500 DIA PITCHPRICE 7SN 5N 8I63A778 SERIES 400C 866777/ 9777 W WIDE BLADE EW EXTRA WIDE N NARROW PROPELLERS SERIES 100 TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP 66 77 7 7 8 67 678 March 1988 133