I just put a 26CC engine in my plane. I have found that when doing a range check (72 mhz) with the antenna down and engine NOT running, everything works well up to 100' or so. When turning on the ignition switch, I get glitching of several control surfaces around 70'. Can't figure out why when the engine is not running. Any thoughts or potential solutions to eliminate glitch?

Thanks.

Dennis, What happens when the engine is running? Dan.

It still glitches. I'm concerned that it glitches without the engine running.

Dennis, It sounds like you have a bad ignition module since it is happening without the engine running. Even with that, you should make sure that none of you radio system is co-mingled with any of the ignition system. All the parts should be separated by as much as possible with no metallic parts in between them. That includes the batteries, wires, switches and servos. Don't use any metallic pushrods to the motor. With all that said, replace the ignition module first. Dan.

With ignition on, the CDI charging unit has a quite high frequency pulse.
I think, you have done a couple of basic things wrong:
Damaged shielding? Perhaps no shielding at all?
Too little distance between ALL ignition components, and ALL RC components. Ignition manufacturers ALL recommend at least 10"
Conducting (Metallic) connectingbetween Throttle servo and engine
Ignition failure

Maybe a combination of those.

Modern designs lead fliers to neglect the extreme power pulses that an ignition and it's charging unit produces. It's the nature of the beast. Keep your eyes open folks. A lot of investment is on the line!

Not sure what it is, the shielding is in perfect condition, probably 10" from ign to the receiver. Ign battery up front, receiver battery with the receiver. Frustrating to say the least...

Try a different ignition unit

First, make sure the spark plug cap is <u>firmly</u> seated on the plug. This takes a lot of force: I can't do it barehanded, I use a folded cloth to shield my hand while I press on the cap.You might secure it with a hose clamp to be sure it's a solid connection. If that's not the fix, then move on to the more elaborate fixes. I have encountered the same thing you are describing, and the plug connection was the problem.

If you don't mind me asking, what brand ignition is it? Some are better than others when it comes to internal shielding. I've looked inside one CDI unit that had a plastic case and there was NO shielding inside of that case at all. As Pe mentioned the charging circuit makes a HighFrequency noise and if the case is not properly designed that could be the cause. I've also seen situations where a particular receiver would be quite sensitive to noise and another receiver of the exact same make and model would not have a problem.


Edited to add: Remember, this thing is doing this and it is NOT running. Just turning on the ignition causes problems and there is supposed to be NOTHING going out to the plug at that point.

Ign came oput of my 3MM 50CC, it's marked 3MM but i believe it's really an Rcexl. I ran the engine with the spark plug cap on, if it was loose, I assumed it would miss when running. It's putting out "noise" when NOT Running. I'll try and secure the plug cap tighter just in case. Next step, try and block with foil, then try another ignition.

Most of my ignitions take the standard sized plug, this is the CM6. Changing the plug cap might be a bit tricky.

how about the receiver antenna? Could the wire be broken?

If you can post a couple photos so we can better help! Thanks Capt,n

My thought, see post #5, still is the capacitor charging unit sending out RFI (Radio Frequency Interference), because it happens with ignition on, and engine not running.
w8ye suggested to try a different unit.

Does the cap match the plug size? Not clear from your post. If so as others have said, try a different ignition.

If the plug cap doesn't match the plug in the engine, change the cap to one that fits correctly. These are easy to change and there are several threads on here with pictures of how to do it.

So you have a 14mm cap on a CM6 plug? The plug should be grounded to the shield, I would expect problems until this condition is corrected. Vally View or Agape Racing sells CM6 caps, there's a thread here that describes the process of replacing the cap.

The 3MM ignition (Rcexl) fits a CM-6 plug so I'd guess the situation is the other way around .... too small a cap on a larger plug. Still a grounding and general fit problem though!

Hey folks, pls read!

My guess is if his airplane checks out ok too 100 feet or more and things are good. It is when he turns the ignition on to the engine....is when things go glitchy....it must be his ignition setup is not right. Maybe he should read all the things that can cause ignition glitches and check one thing at a time untill he finds the problem. No magic wan is going to fix it! Capt,n

Pe, it appears that not all folks are paying attention. They are trying to fix a spark problem where there is no demand for a spark.
I keep coming back here hoping to read the solution to the problem that DennisS is asking help for.

I read . . . and I'm still trying to think of a scenario that would cause it.  Something in the ignition circut that pulls the receiver voltage below proper levels?  Should not happen if the module battery is isolated from the receiver battery.  Some bad circuitry in the module (we are assuming it is not a magneto ignition) that causes interference?  Is the kill-switch hardwired or optical?  Is the ignition battery cable near the receiver antenna?

Do you have an image of where the antenna wire is in the model?

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<hr />How about put the antena all the way up and try the same test....have 2 people and walk as far as you can and still have good solid working control surface,s .If that seems ok...start engine....and if it tries to fly away....hit it with a shovel! Fixed!

LMAO!!!! I don't care what anyone says but that was funny.

Good one John.

Yup I thought so!!!! Now its of to work....my wife has plans....not fun ones either! Capt,n

Is the switch for the ignition new? I have had one do the same thing and replacing the switch fixed it. Possibly dirty contacts in the switch itself.