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Old 04-16-2008, 08:06 PM   #1
Wayne 1
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Heres a good one.Just firing up my GP SU31 with the SPE 40 {hard to start} anyway thats another problem.Had the plug out grounded to the engine with the radio and receiver on and the servos would jump just a touch as i rubbed the plug on block. I have plastic rods on throttle and choke servo so i thought i would not get feed back.Battery and wires away from receiver about 10 inches.Whats doin this? Baffeld Wayne
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Old 04-16-2008, 08:26 PM   #2
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Re: Interference

I am not sure what you mean by " had the plug out" but the first question would be is it a resistor plug indicated by eg. RJ 961 instead of J961 ?? Can you hook
a pushrod to the engine to use manually by hand with your radio turned on while
running the engine? Maybe use safety retainers in front of the wing....

Last edited by cassat; 04-16-2008 at 08:29 PM.
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Old 04-17-2008, 03:50 AM   #3
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Re: Interference

You will get interference in this situation. By rubbing the plug against the engine you are putting metal on metal and generating RF. The type of sparkplug you have makes no difference, resistor plugs prevent RF when the engine is running. When the plug is reinstalled and tightened there is no relative movement between the plug and engine and therefore no interference. If you place a metal screwdriver against a glow engine with the receiver turned on you will get the same effect, don't worry about it. Just don't fly with the sparkplug hanging out of the engine !


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Old 04-17-2008, 11:37 AM   #4
Wayne 1
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Re: Interference

Right on yup it is a resistor plug and they all make the twitch with the plug rub.Absolutly no RF when engine is running.Just got PEED off lastnite at the hard to start SPE40,.Thanks
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Old 04-19-2008, 12:24 PM   #5
Marcel B.
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Re: Interference

Jollidude has it right.
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Old 04-19-2008, 06:53 PM   #6
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Re: Interference

Other than the cranky motor, how do you like the big Sukhoi? just getting ready to order one with a dl50 for power (Too much engine??)

Bill......AKA "WW"
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