Radio Control: Helicopters

RADIO CONTROL HELICOPTERS a. I. RECEIVED interesting E-mail about column wrote several issues ago concerning pinch test judging engines idle mixture setting reader concerned about long should pinch fuel line because seeing results mentioned answer squeeze until see some results engine idle pinch line stop fuel flowing engine will cause engine run lean However continue constrict line engine will quit lack fuel Pinching fuel line properly adjusted idle mixture will allow engine increase rpm slightly during three- four-second period rpm will decrease because fuel starvation engines rpm does increase could indication idle mixture too lean An increase rpm four seconds indicates too-rich idle mixture second part E-mail regarded adjusting main needle valve since adjustments cant made engine running wide-open have seen people strap helicopter test stand table try adjust main needle valve running up engine strongly advise against two reasons First its extremely dangerous adjusting mixture full throttle puts too close helicopter its spinning rotor blades Any accident such helicopter coming loose its tie-down could fatal Second such technique does provide good hasis adjust engine Any test stand table restricts downward flow air through rotor disk increases drag entire rotor system compared normal hover engine full rpm helicopter would full forward flight least aggressively maneuvering means greatly increased air-mass flow rate through rotor system no way simulate test stand mixture adjustments would inaccurate However some people like run engines test stand break make initial mixture adjustments case rotor system replaced suitable-size propeller load up engine being used fixedwing aircraft manner pinch test can used idle main needle valve adjustments idle mixture adjusted described above full-throttle adjustments require different technique Since dont know main needle valve set make initial needle valve settings according manufacturer recommendations However make sure engine rich mixture range open main needle valve farther recommendedsay /s- turn Any additional richness will allow engine run little cooler increased lubrication engine full throttle pinch fuel line second two note what happens engines sound rpm Since mixture purposely set slightly rich side would expect engine increase slightly rpm excess fuel burned ideal mixture obtained Close main needle valve slightly try test again full throttle engine increases rpm its still slightly rich side Continue closing main needle valve until engines rpm no longer increases fuel line pinched However should engine decrease rpm first rising means mixture too lean bad engine technique bench-run engine rather install helicopter run slightly rich first few flights have never claimed expert engines anything 110 Model Aviation ersal ZBOO receiver Zebra Direct can used almost transmitter Note multitude pins will accept wide variety servos Zebra Reflex servo small powerful fast Its what looking helicopters Note standard plug can used other receivers else leave engine work have knowledge area feel helicopter engines good come almost broken ready fly have around few years might remember take great care breaking new engines get max power long engine life Im sure its combination new metal technology manufacturing techniques make type engine break-in almost thing past However try keep open mind would like hear thoughts need engine break-in also received E-mail flier progressing nicely hovering forward flight having problems transitioning forward flight back hover didnt want get helicopter close ground flew around altitude brought helicopter stop front him proceeded descend normal hover altitude rather normal technique someone does have help someone experienced makes entire process difficult because helicopter trying descend its own downwash affects controls can make helicopter unstable calm wind because downwash stays right below helicopter best way learn transition forward flight back hover have help more-experienced flier buddy box option should consider few things before trying approach landing First make sure helicopter set up accomplish approach landing work hovering might have restricted collective pitch range paid attention adjusting tail rotor comp Check collective pitch range pitch gauge make sure have sufficient negative pitchsay 3- .50 need get helicopter descent keeping up rotor speed Learn paint like pros * Fast easy way make stitches ** Simple method finishing tapes use simple system 4Order over internet secure site Paint over fiberglass fabric Only $1995 US Plus Shipping & handling F&M Enterprises Auburn Dale Drive El Toro California USA 92630-5005 Web address http //www tits com Phone fax 949-583-1455 Eajey REIJAILE S-L-D-O-W Idle PLUS. E4SV SAFE studs Single Twin-cylinders Twin engines 10 Interference Works Rxs Light Less 35 grams Ultra-simple installation ReKI1R2L-$a Multi-Cylinders Ask Super GlowLitel lastell seive eled Ilakqes mieur Ta aed BETTER knob stick- type servo drivers.. Find your servos electrical center computer accuracy Its MUCH MORE lust SUPER Servo Driver Detect bad servos. BEFORE cause problems UhI W~ 31185 Schoolcraft Livonia Ml 48150 Website http//wwwelectrodynamcom 1-800-337-1638 Orders Info 1-734-422-542 ~ Fax 1-734-422-5338 May1999 111 une up airrrwr rur U iung slow approach. Authors X-Cell Graphite has longer-than-usual fuel line make pinch test easier Restrict fuel engine listen changes rpm decide fuel adjustments Theres no fear flameouts GIowL Itos onboardi doesnt Ret better this. Breeze thru control setup 1 WARUIRDS OVER DELAWARE 5 21111 LONG AMR PRODUCTIONS P0 ION 1113 2 WARUIRD SCALE CLASSIC 91 21111 LONGI $1995 EACH PRIORITY MAIL TO TOMS RIVER NJ 01754 THE BATTERY TOOL field box tool tor 4-9 cell battery packs Use voltmeter loaded voltmeter check packs charge Use discharge pack read its capacity Unit discharges 300 ma auto shut-off lv per cell Cycles nacks chariin Battery Tool $5895 4-pc Universal Cord Set $1595 Add $5 5&H FREE shipping order both JANTRONICS 406 727-3001 http//wwwwtpnet/DBEST/jtIjantronicsbtmI PARTS HornetDpo Aero Electric 3706 N 33rd St Galesburg Ml 49053 Fax/Phone 616-665-9693 E-Mail aero-electric@warldnatatt net Otherwise will have throttle stick back full idle helicopter still wont come downat least fast would want throttle stick back full idle what happening engine speed therefore rotor speed Descending close ground place find yourself low power low rotor speed Use idle up high throttle trim setting keep engine running good speed ensure proper flying rotor speed during landing Tail rotor comp feature modern helicopter radios adjusts tail rotor compensate changes helicopter torque caused changes collective pitch see yours working set correctly bring helicopter hover add power climb straight up Did nose remain pointed desired direction did tail rotor comp adjusted up side Reduce power let helicopter descend back normal hover position Did nose again maintain desired direction did tail rotor comp adjusted properly down direction What youre lucky nose came off-position climb descent nose moved left climbing increase climb tail rotor comp decrease nose right movement similar manner adjust down tail rotor comp keep nose pointed desired direction during descent detailed instructions refer radios owners manual Now helicopter better-set up make first landing pattern try develop feeling really going land rather make series low approaches pilots get fixated landings continue press bad approach point crashing rather going around another attempt cure plan approaches series several low approaches making little lower controlled previous will make familiar going around higher altitude will feel comfortable should needed lower altitude times during landing pattern maneuvering general becomes difficult see helicopters orientation going right left what changes need make use several techniques may helpful progress learning landing pattern general flying First remind yourself what doing may seem odd heat battle sometimes forget making right turn cant see helicopter well would like know right turn little left stick will roll back level type situational awareness helps get brain overload Second make helicopter visible Paint canopy bright colors rather blue black green etc like yellow because can seen against blue sky white clouds dark overcast day can make rotor blades visible adding tape contrasting color blades white cut some dark blade-covering material strips about three inches wide Put strip near blade tip leave about three inches plain blade add another strip covering overlapping small portion leading edge cutting off excess material trailing edge top blade will have extra blade-covering material fly top rotor disk will show up like bulls-eye dont see looking bottom rotor disk makes easy see right-side up gives feel amount bank use making turns Zebra Direct 10706 DeAndra Dr Zionsville IN 46077 Tel [800] 733112 Model Aviation 4 0211 produces nice line aftermarket electronics helicopters have using Universal Z800 FM receiver model few weeks best thing can say about have nothing say works time no glitches receiver has distinctive shape Rather box shape probably used seeing Z800 looks similar small candy bar servos plugged end However rather being just another pretty face Z800 has some unique features uses universal decoding allows used almost FM transmitter Im sure its done can use Z800 Futaba JR Airtronics Hitec etc having proper crystal match transmitter frequency Another nice feature Z800 can used almost servo may have stored away days past Most servos use three wires positive negative signal wire Z800 has four pins channel diagram showing plug servos Futaba JR Airtronics As example bottom three pins used Futaba JR servo ground wire top Airtronics servo plugs top three pins signal wire top have tried mixing servos helicopter dont see could done us have old servos around greatperforming receiver extra helicopter airplane Zebra Direct offers complete line servos Im using Pro Reflex 1188 metal gears seems normal respect specifications impressive 130 inch-ounces torque 24-second transit time 600 rotation powerful servo wellsuited helicopter use am concerned about quality components go helicopters Im impressed what have seen Zebra Direct uu uuru vvuuu ruocra5o yuu H Jig Stations Whether mounted bench optional uni strut stations give complete flexibility building Imagine assembling fuselage completely dry checking fit alignment pieceThen after meets satisfaction loosen aide jig remove glue re-assemble exactly aligned matter minutesAvailable Jumbo fuselages up 10 wide Giant fuselages up 15 wide jumbo set four$2495 Giant set four$3895 Guide AiI -KITES FREE COLOR CATALOG Choose over 200 exc ting k tea S unusual & Innovative des gns Call write catabg todayl Into Wind 1800154 L B-MA Pearl St. Boulder CO 80302 m MV-I Typhoon Nata FAI Winner Plans Parts available 909 1000 22 1140 versions Plug-in Wing Tube & Sockets 7116 5/87/8 1-1/2 diameter Special Lengths Order Plug-in Wing Adjusters 4-pack Adjust Both Wing Panels Plug-in Adjustable Stab Kits Micro-Adjustment Both Stab Panels Soft-N-Safe Engine Mounts 120 91 60 size engines Feather Lite Glass Cloth 7 oz Close Weave Fast Filling Lightest Finished Weight L77 2100 N Old Mill Rd Brookline MO 65619 one 417-725-7755 11111 7VISA/MasterCard Welcomed $ 50 per itenS&I1 May1999 113 FUSELAGE JIG STATIONS MORE GATOR PRODUCTS FOR ADDITIONAL INFORMATION ON ALL OUR OFFERINGS SEND SASE TO 862 PETERSBURG ROAD HOBBY HANGAR HEBRONKY 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