CRRC Pro GF26I

[Jedijody]

This plane is one of my sloppier jobs, everything on the right is ignition, the left is throttle servo. It's set up a little different but much simpler. One battery, one switch for Rx and ignition, opto-kill power and switch lead into Rx, small ignition regulator between opto-kill and ignition. Rx wiring and ignition separated as much as possible, 72Mhz PPM Rx, no glitchin'.

[3Dguy]

Your plug cap doesn't look like it's seated properly... Mine seems to be lower than what you have pictured.

[Wingman26]

Today I loosened the clamp, turned the plane upside down on a table and really leaned on the plug cap, it went maybe 1/8" further on than the photo. So then I took it outside to see what would happen.

I was having a heck of a time starting the engine today, I finally had to get the electric starter back out, it would start and quit, control surfaces flopping wildly all over the place. I fiddled and fiddled to no avail. I had a thought, someone mentioned they thought the radio was glitching and causing the throttle servo to go crazy and this might be causing the crazy engine response. I set the engine to a high idle and didn't even turn the radio on, engine started and cut out 2 or 3 times in 3 or 4 seconds before dying, it was doing the exact same thing as when the radio was on, so no difference radio on or off on the engine running.

[geneween]

You may want to try isolating the problem on step at a time. first I would disconnect all the radio gear. run a straight battery to the ignition module and only hookup the throttle servo to the receiver. try and get the motor to run first if that works add the opto kill then the switch ect. Then once you get that down move on to the rest of the electronics. chasing down radio noise and trouble shooting the engine you could go round and round for weeks.

gene

[2robinhood]

This has been going on for a while now and I forget, Did you even try a new / different ignition?
By the way you may want to watch, it seems like your engine could be suck some sand / dirt.

[Wingman26]

	Quote: Originally Posted by geneween
	chasing down radio noise and trouble shooting the engine you could go round and round for weeks. gene

That's exactly what we have been doing.

In the test this afternoon I initially tried it exactly as shown in the photos above, everything hooked up, when that didn't work I disconnected the opto kill, no help, then finally went to just the engine by itself, and it was bucking and spitting.

[Wingman26]

That's shredded rubber from the starter cone!

Jody sent me a new ignition module, that initially helped the starting issue tremendously, now I'm wondering if this one has gone bad, I might have to try a RC EXL.

[Crashis Clay]

Wingman26, this thread is killing me! I cant really tell what is going on here but one thing is for sure, judging by your pictures you really need to clean up your radio install to get rid of the RF! as for the rest of your problems I don't know for sure so this is what I have to offer you...... pull the motor and ignition and send it to me, I will make it work for you (might need the electric starter to start it till it is broke in but I can promise you I can get it running and running good) No charge for labor, you pay for parts at my cost ! let me know,,,,

[Crashis Clay]

here are a couple of pics of my install on a 1/4 scale plane, yes, the radio system in the picture is a 2.4 but this plane was first flown on an FM Hitec electron 6 rx, it is very important that all wires are held in their place and unable to move about the fuselage, wires from different components can pass by or even around and over each other but......... if they move around enough that they cross or pass each other and then uncross or alter their intersecting path with each other, this can cause a problem, at least in my experience and lessons at the school of Hard Knox I always try to think of my models as a full scale aircraft, every full scale aircraft I have seen had its wires ran in a very neatly and secured well enough that they would not move to much during flight and the wires were not routed randomly either, when possible, they were grouped into a cable like a wiring harness making sure to keep sensitive electronics wires away from high voltage or high current wires

[Crashis Clay]

[Wingman26]

I'll keep your offer in mind!

This is my first gas engine, but not my first gas plane as evidenced by the photos of the Yak 54 a few pages back, and I have over 2 gallons of gas through this engine. I am also quite familiar with general aviation aircraft, I was the Chief Pilot for the Sheriff's Dept in this county for a number of years.

I should point out that no ignition components are close to the receiver, the only thing ignition related anywhere near the receiver is the opto kill switch, which is velcroed to the wing tube, and wasn't even hooked up for the vast majority of the testing in the videos I have posted.

Yes, I could clean the wiring up a bit, but it would require adding extensions, more connectors and longer wires might look neater, but increase the potential for problems, I learned that from over 40 years as a ham radio operator, since the plane isn't quite to the point of flying some of the wiring is unsecured, I've already cut out and had to throw away 20+ zip ties as I try to move things around to finalize this radio installation.

I also used to sell and install communications equipment in the business I had before I retired (the first time) and became a Deputy.

Since the engine isn't even running right I can't really address the radio problem till I get the engine running right, but I'm thinking the interference problem and the engine problem might be originating in the replacement ignition. I'm still looking for solutions, so I welcome comments or ideas on what the problem might be.

This video is with the original ignition in the same plane, the engine with the original ignition had always been incredibly hard to start, this video of the engine running is with everything hooked up, the switches and the opto kill switch, this video is 2:55 and during that time the only control surface that moved was when I bumped the rudder a bit when goosing the throttle, no glitches with the original ignition, but then it crapped out and didn't want to run at all.

This video is from March 1, 2010

YouTube- CRRC GF26i engine test

Here's the latest video, with the new ignition Jody sent me, the engine started easily ever since it was installed, but the glitches started when the new ignition was installed. Now today it was extremely hard to start, and wouldn't keep running, cutting out just as shown in this video.

This video is from April 29, 2010

YouTube- Engine test 4 28 2010

[3Dguy]

Wingman, does it run fine on a bench?

[Wingman26]

This afternoon it was being extremely difficult and I had to get the electric starter back out. After fiddling with it for awhile trying to get it to run, I was thinking what to do next, I set the idle up to a high idle and plugged the ignition in, I didn't turn the radio on at all, so it was essentially a bench run, if did the exact same thing it was doing in the last video, it started and was cutting out badly and only ran a few seconds, the only difference is that the radio wasn't turned on.

[Jedijody]

Do you have the willingness and capability to make this minor modification to you crankcase and the ability to check and set your own timing, if so I'll send you an Rcexl ignition.

[Wingman26]

No sweat at all, do you still have my address on file? If not I can PM, email or call.