ok...thanks for your help

I would use a choke / rf filter on the throttle servo lead That has helped me out a few times. Ernie

Judging from the fact that we have not heard from you again it seems reasonably fair to assume that you solved your problem, however it would have been a nice gesture if you had posted the final result as a means of advising those of us who made possible cure suggestions what was the outcome, bearing in mind that in most things we learn from each other.

Karol

resistor plug fixed it..thanks

Ok, then you do have an ignition problem. That's a shielded unit and is not designed around the use of a resistor plug since one is supposed to be inside the cap. Be thinking about replacing it.

TOM, go back and re-read your earlier posts on this thread. This is a un-shielded mag ignition .... not a shielded EI system. A resistor plug is a reasonable solution to the problem here if one was not being used from the start.

Always use a resistor spark plug if available for your engine. Even if your ignition is a full shielded system.The CM-6 is a non resistor plug so we use a resistor in the spark plug cap. I have gave up on resistor spark plug wire .The old Beldon resistor wire was good and we used it for years,then Beldon quite making there own wire and problems started. I see RCEXL has quit the resistor wire and uses a resistor the the cap for the 10MM spark plug CM-6.
We have a RF meter that will tell you right now if you have RFI. You should see what a Fuji Ign does to our meter.
I built a very noise ign system to check out the 2.4 radios.With a resistor spark plug my range checks were fine. Put in a non resistor plug and it ate up the 2.4 system both the FASST and the Spectrum.This was good enough check for me. ALWAYS USE A RESISTOR SPARK PLUG.................
BCCHI

I was relating his ignition with the one I saw in another thread using this brand of engine. That one had a shielded ignition so I presumed this one to be the same type. One of the OP's earlier posts eliminated the ignition having a ground strap, which most of the unshielded ignitions have.

Oh well...

Bill,

Knew about the Fuji ignitions. You mean that still hasn't been fixed????

Warbird72!!! When you said, "I would use a choke / rf filter on the throttle servo lead That has helped me out a few times. Ernie" do you mean one of those farad beads(sp), (you know those round cylinder things that you would probably see on laptop computer power adapters) Something like this: ( i should have attached a picture for you so you know what i'm talking about.)

As the current trend favours shielded systems, is such an ignition system using a non resistor type plug a better option than an unshielded system using a resistor type plug, and does a magneto ignition generate more RF noise than an EI one.

Karol

I have several older unshielded plug type CH systems and I don't get any noticable RF from them when I use resistor plugs. The guy I fly will also has a couple that he uses and he has no trouble either.

Would you guys rather fly with ppm or pcm though? I think i'm going to use ppm to check for interference, and then once all is good, i'm going to put pcm in place.

I prefer PCM because, it will generally warn me of an interference issue not detected on the ground. With the elevator, rudder and aileron servos set to hold position and the throttle set to go low... at any time a throttle back is noted, I'm warned and it is time to get the plane close and make a landing.

About six months ago, a rebuild of a Ultra Stick Lite was finished and flowm a few times and then suddenly the warming came. The problem was too much spark plug wire caused a loop that evidently pressured the boot loose from seating fully on the plug. A small hose clamp fixed the problem. Without a warning to heed, I might have gotten too far out and lost control.

wow...you're lucky. i have a old gas low wing trainer airplane with a US 42 on it. I first had interference problems with in and i was using a PPM reciever. But i soon learned that having your kill switch, inside your airplane, with a metal rod attached to a servo to control the kill switch, all within about 6 inches of the reciever is not the greatest thing to do...[X(] And then i also changed to a PCM reciever which helped out a bunch.

I also had a problem with my alieron servo burning out constantly.
*But i soon fixed that problem by putting one servo in each wing for each alieron. Now i seem to have no problems with that plane.

So basically that was my first plane to learn off of for gas engines. (what a pain!)

Just recently I almost lost my old faithful GP Big Stick 60, G20 powered model from what proved to be an intermittently defective Rx. After a successful initial flight of the day the model suddenly went beserk right on takeoff on it's second flight and only the angels on duty saved it from certain rekitting as I lost all control as the model dropped it's left wing and headed for terra firma. I regained limited control with less than 30' of altitude and was able to make a quick and uneventful landing. An immediate check revealed that all the control surfaces were jumping around like crazy with commands from the Tx having very little if any effect. Talk about a close shave .... that was certaintly one.

Karol

How did you know that the RX was bad?

It was only by process of elimination and substitution that I discovered that the Rx was the culprit, as I would have control one moment and not the next. I guess I really can't complain as though it has never been in a crash that particular Rx has given more than 12 years of yeoman service and just goes to show that one can't be too careful as I always do periodic maintenance checks on all my models. Anyway I'm glad it did not cost me the model.

Karol

yeah really...wow...and it's just a regular rx reciever right? nothing fancy?

Just a regular Futaba 7ch. PPM Rx coupled to my trusty 8UAF Tx.

Karol

okay...sounds simple enough. i have a 7cap and i have had no problems so far..(knock on wood!)

Most all our current electronic radio stuff are very reliable and have an extremely high effeciency rate, but unfortunately not all will give a warning that something major is about to take place, however there have been quite a few lucky ones like myself who do get a second chance. If yours is working okay and you have not crashed your model then more than likely there is nothing to worry about as in my 30 years of R/C this is the first Rx ever to give a problem.

Karol

I may have had one slight glitch with one of my glow models with a PPM reciever....but i can't really tell if it was the wind or not...so yes, i can probably say that this transmitter has been very good to me so far. But i never heard of an RX going bad. It wasn't the crystal too was it?

Sure glad to hear you didn't lose the Stick Karol. Might've hurt the G20 too and that would be BAD. Hope you have a great year flying.

Matt,

Not being an electronic person once something like that starts acting up that's it for me, so I can't say what is the problem, but if it's man made then it can and with time will go bad. Plus it's cheaper and much less of a hassle for me to buy a new Rx. Maybe if I had a reliable repair or service centre close by then maybe.

Jezmo,

I consider myself quite lucky not to have lost her and possibly damaged the G20. Most of us at sometime or the other have experienced a glitch of some kind but this one was the grandaddy of them all. All the best for the New Year and here's hoping it will be a great flying year for All of us.

Karol

Just to make dang sure that all is well I sent my trusty Fut 8UAF Tx to Bob at Radio South who gave it a thorough going over and has given it a clean bill of health. Silly me forgot to send the defective Rx along with it ... oh well, maybe one of these days.

Karol