Originally Posted by
av8tor1977
This all just isn't making sense my friend. Indeed, the servos moving that way is not ok, and indicates some sort of a problem with the ignition system, though I can't say that is the only problem you have. That problem may indeed be only the spark plug cap not on tight. You have to push them on very hard. You should also be running a resistor plug just to be safe.
I wish you were right this time Av8tor. Unfortunately, the problem is massive vibration. If my video to computer lead was still functional (I am unable to upload videos currently), I would have taken a video and uploaded it for all to see. I will repeat here: the control surfaces were vibrating through approx 15 mm up and 15 mm down, only the elevators. The ailerons, flaps and throttle servos are not fluctuating. The servos were visibly deflecting by around 5 degrees or more each way trying to hold centre. This results in the high current drain and rapid depletion of the batteries.
It sure seems odd that you had it running perfectly on the test stand, and now on the plane it won't. That tells you something right there.
No, it was never running perfectly. I must have conveyed the wrong impression about this.
I think it is time to offer a case of XXXX Gold to someone familiar with small engines, and hopefully in aircraft applications, to come spend a couple of hours with you sorting it......
Sorry, but we are trying from here the best we can,
AV8TOR
Done that. There have been two engineering professionals who have spent up to 3 hours at a time with me working on it on multiple occasions. All stripped and rebuilt under guidance etc.
Despite all that, every single small problem that has been found, I found myself just by perseverance, asking questions here and on the other thread and reading the answers here, such as yours etc.
I dearly wish it was just a case of "take it to an expert" and all will be quickly and easily solved.
Many thanks again for your comments though! I don't wish to appear unappreciative.
Jim.