Radio Control: Giants

RADIO CONTROL GIANTS r ri ITS hERE beautiful bit British ironmongery aluminum-mongery RCV 120 engine showed up its specially fitted foam carton wrapped clear plastic RCV stands Rotating Cylinder Valve name company manufactures engine photos drawings engine dont prepare real item glow plug bottom front engine instructions strongly advise against trying start engine propeller Strange essentially European engine recommended fuel should contain 5- 10% nitro Most European fuels omit alto element mixture eight-page instruction manual comes RCV 120 complete specitic engine run first instructions notes remote glow plug connection necessary plug near propeller driver flipping glow plug connector off would certainly whomp propeller instructions tout behind-thepropeller starting procedure leads design Giant Scale cowls circular hole top starter pokes top engine couple inches front engine mount some concern about 21 gearing engine manual instructs RCV firmly mounted firewall addition common antivibration Lord/rubber mounting devices instructions go further recommend bolting models wing aircraft start up tune vibrations transmitted throughout model absorbed attached wing Instructions suggest wings affixed rubber bands will probably flop around engine running instructions recommend wings bolted place fact engine geared leads healthy recommendation propellers pitched higher usual 120 recommended break-in propeller 18 x 12 20 x 10 suggested flight propeller engine can assembled position exhaust carburetor fit installation model Although instruction manual notes things shouldnt taken apart provides step-by step procedures doing engine slim repositioning shouldnt necessary As provided exhaust muffler located beneath engine carburetor mounted top carburetor looks much like Peny set up like Since colunm being written midJanuary will before can give RCV outdoor run-in includes about hour-and-a-half bench running five minutes time figure engine will have bolted house because looks strong runner have run-in propeller its quite club four-stoke 120 back strongly recommended flight transmitter batteries checked frequently bad cells advice prompted Bob Pinkus engineer/administrator Wright Field Dayton Ohio suggest better way check RC Radio Control batteries under load simple digital voltmeter Bob flies models historic Ohio airfield checks batteries before flight Hes found dead cell after first flight day Bobs recommendations forwarded E-mail Theyve edited smidgen theyre still complete description set up digital voltmeter thoroughly check RC batteries digital field meter monitor both Tx [transmitter] Rx [receiver] batteries provides simulated flight load just like ready-made Expanded Scale Voltmeter ESV will much accurate analog ESV will cost about half much will avoid cost separate Volt/Ohm meter serious RCer will eventually find he/she must have will also save room crowded field box unit used two 82-ohm one-watt resistors project chose use R5271-133 50 ohms 10 watts items readily available modelers overkill wattage assumes resistor will get hot cause bum resistance higher current draw will lower original unit still within usable range comfortable basic electronics know calculate resistance wattage series parallel resistors anywhere between 40 50 ohms least two watts dissipation capability will work actual composition resistors carbon wire wound film does matter commercial units use separate resistor Tx Rx necessary device will provide loads adequate testing purposes will show weak cells field main reason reading battery packs Most mini digital VOMs use standard banana jacks such R5274-72 1 however ones pictures Radio Shack parts Remove plastic covers banana jacks thread piece PlexiglasTM just about non-conductive material scrap A- -inch-thick plywood will work Space jacks align proper tenninals VOM should able unplug assembly meter allow its use regular test unit Authors note resistors connected across two new leads according diagram Bob provided momentary push button RS 2751571 275-1548 can added Bob Pinkus schematic wiring VOM simulate batteries load Squiggle near top shows installation resistors June 1999 95 #4NI ooo 0 battery circuit allow instant avoid need constantly turning meter off you will need run another on/off slide switch RS 275-406 parallel allow regular use meter having constantly hold button down put back meter because room constraintsplus spring push button strong enough turn unit off until simply press down meter momentarily turn reading arent comfortable arrangement Todays meters draw little current can just leave entire time field Everybody knows consider NiCd battery dead 11 volts per cell Therefore standard Tx cutoff voltage 88 standard Rxs 44 VDC [Volts Direct Current] add 20% safety factor stop 1056 528 Everybody has own right cutoffs comfortable point setup will allow read batteries heed reading Note LCDs [Liquid Crystal Displays] like extreme heat cold will go solid black left sunlight Keep out direct sunlight other source heat cold-weather flier cold may cause same condition Ive put rag ice water get display go back numbers hot weather blow warm breath rub meter cold Final note know thousands purists out just waiting tear apart circuit too simple simulated loads matter personal preferences tens thousands Rxs servos available mention flight conditions extremes airplane building skills read tight hinges etc make literally impossible define true simulated loads has shown dead cell actually developed two-year-old pack between flights plain meter no load probably would have done Sincere thanks Bob taking bull horns providing method checking RC batteries under simulated flight load bad intended continue war stories describing airplanes Ive flown actually flew space constraints have caused delay until next month See July issue odel Aviation Sparks Tucson AZ built Midwest 202 sharp eye its completed weight 11 pounds has VS 120 Gary has high praise Midwest Giant kits