Radio Control: Helicopters

RADIO CONTROL HELICOPTERS ir MY LAST column discussed basic carburetor adjustments 05 46 FX-H engine pinch test check idle mixture engines used helicopters However interesting experience flying field other day got discussion about engines setup adjustments fliers said having trouble getting engine helicopter fly way would like asked would watch hovered flew around After landed said running too rich idle top end could side carrying too much pitch hover After making some changes happy improved performance engine helicopter wanted know thought idle mixture rich side could judge engine mixture himself during flight brought back pinch test last month knee curve presented October 1998 column repeated rich lean labels reversed drawing October issue reason thought pilots idle rich engine hesitated acceleration idle produced excess exhaust smoke gave pinch test noted large acceleration three four seconds Turning idle needle valve closed / turn brought pinch test less four seconds acceleration also allowed engine accelerate idle full power hesitation adjustment rather easy make standard two-needle carburetor take care screw idle needle valve too much adjustment rather sensitive Adjusting main needle valve no complicated does require pilot answer some basic flight-requirement-type questions first What type flying will doing today going practice hovering-type maneuvers no need tweak carburetor max power wont needed Instead engine can adjusted little rich side provide additional cooling lubrication will make engine last longer still providing adequate power price engines days anything can done make last longer should considered going max-perform helicopter may want ask yourself really need power engine has offer fly intended maneuvers Sometimes practice entering exiting different maneuvers maneuver relatively slow motion improve flying techniques can therefore get away something less max power However during contest fun-fly want power engine has offer get out helicopter maneuvers must taken consideration during carburetor adjustments Now Ill go through adjustments would make carburetor above flight requirements look knee curve first practicing hovering-type maneuvers therefore helicopter would max-performed Although dont want get out four-cycle rangethat would make erraticrunning engineit would nice run engine rich possible consistent smooth-perfoiming helicopter would adjust carburetor engine operating portion curve marked top diagram engine mainly rich two-cycle area now can hear crackle exhaust indicating slightly rich four-cycle meets requirements having sufficient power still running engine plenty fuel cooling lubrication second scenario flying aerobatics including some 3D contest fun-fly practicing improve techniques get better acquainted helicopter would lean out mixture slightly put engine area marked B curve top diagram engine developing power entirely two-cycle range say entirely two-cycle range because engine mixture will change slightly during flight various maneuvers February 1999 99 CD B Power FourCycle Two-Cycle RichMixtureLean Knee Curve desired Desired Throttle arm placement idle THE US SAILPLANE & ELECTRIC AIRPLANE MAGAZINE Scale & Sport Electrics Demystifring Electracs Airfoils Build It1 Square Plan Features Scale Slope Thermal Soaring Center Poster Special Features much Over three years puhlication WA residents $2592 1st Class mail delivery add $6 I Ph/Far 509 627- 0456 e-mail sailnelec@aolcom wwwsemodelercom S&E Modeler PO Box 4250 W Richiand WA 99353 performed fuel used However though engine two-cycle range Im fairly confident isnt too lean because takes click two previous richer setting get change want engine sounds feels quite bit stronger steady higher-pitch sound does vary need power engine has offer very often way fly can lean engine still further bring area marked C curve Although will give best performance have no way tell accidentally leaned mixture too much could beyond knee curve area marked D dangerous place put engine mixture too lean therefore does allow enough fuel engine proper lubrication cooling Although may able get away flying area flight two prolonged operation will ruin engine us have seen guy flying field can never get engine run right muffler black prolonged overheating sustained running too lean mixture other engine mistake see fliers make assume mixture last weeks flying okay fly week take helicopter out fill fuel make radio check start flying Although mixture adjusted properly changes weather bumping needle valve could have changed mixture slightly bringing closer knee curve should So know mixture set first start flying given day way know check mixture richen needle valve get engine known rich condition Once hear slight rich crackle engine hover know engine relative graph engine can leaned slightly desired days flying begin day bringing engine back known rich condition just guessing curve brings back story said mixture could lean side said could because no way know mixture set knee curve watching listening engine flight know like look amount smoke assume lot means engine rich side However different fuels muffler systems can produce varying amounts smoke similar mixture settings method reliable first thing richen mixture slightly can see increased amount exhaust smoke hear engine crackle slightly nears four-cycle 3W Front Intake Motors The3W 2082 nd3W 40B2ae~ nowase Fotakemoorsaiwet Smoke Mufflers 3W Motors3W-I20iB2 F 19629350 made 3W-Modellmotoren847 lbs hp 7 4L x 22W 3W-I 40iB2-F550 1376cc1839 n 857 lbs p74Lxl25W 3Wi5~GilOS G 202 IS HP lwith 3W 2OiB2IF 2 95GileoG 202 utah7 ass able 3W 78100120/140 B2 Johnson Smoke Mufflers 3W2cycieo l70mx 3385 oz $1375 99810C Hats $1250 Fuel Line Foot $70 3WVelocty StacKs $1795 3W240iB2 Twin 23 HP 6 Ports 2 Plugs per cyl ider $ 2295$ Quality repair service 3W factory trained technician 3W-60i 3W-70i 3W-48 1B2 3W-78 B2 3W-120 1B2 3W-140 1B2 43% Giles G 2O2 Designed byTOC Pilot Wolfgang Matt Wingspan 4 n 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problem minimum collective pitch about 1O throttle arm way past center toward idle position shown bottom diagram result collective pitch being increased too fast throttle slow bring engine up speed power solution minor adjustment bring minimum collective pitch 30 adjusting throttle arm carburetor position shown allowed engine develop power come up speed collective pitch still close 00 providing minimum drag rotor blades Look closely position throttle arm two conditions see what difference little repositioning can make first case throttle arm too far past center idle throttle arm 450 off vertical one-unit movement throttle pushrod would move throttle arm 0707 much sine 450 moving throttle stick throttle arm itself lagging input thereby keeping engine coming up speed power Take closer look throttle arm positioned closer vertical idle position angular difference between throttle arm pushrod almost 900 Virtually pushrod movement transferred angular movement throttle arm what want quickly 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