Thanks you guys for the comeback, my first thought was like what Cappio said, that more rudder would help, but after reading what Bmathews has written I can see the logic in that.
Unfortunately after flying it yesterday the plane is now dust, went in full throttle taking my new ish Irvine 53 with it (cracked the crank case). Total loss of radio contact, just had to watch as it went in.

I now have more questions, any thoughts would be appreciated.
The low down on this plane is that I got second hand virtually free, it was an old pattern ship. I put my sanwa radio set in it, and flew it. I liked it so much because it was so stable and predictable; I gave it a new engine and covering job.
But while I was at it, I doubled the rudder size rearwards (no height), ½” to elevator and the ailerons were 1” strips that I increased to 2” at the root tapering out to 1” at the tips. When I flew it on Wednesday it knife edged so easy, but like I said in my earlier post “tippy and unstable”. On Wednesdays flight my first thought as it took off was that I did not have total radio control, but after a while I found I could control it to a fashion, it was slow to respond and would do odd flicks like someone else was flying it.

I went to the field Friday after posting here, but I had pulled out all of the radio gear and installed the JR receiver from my extra and new futaba servos. This was to eliminate the radio as possible problems. I also added a couple of degrees of right thrust as I noticed the plane had a tiny bit of left thrust. She took off much the same and was erratic until I gained height and then she smoothed out and was flyable for a while. I did a few laps inverted with just a touch of down. I think it was calm weather up there but as I brought her down where it was probably more turbulent due to the trees, she was tippy and erratic again. If the rudder was to too big I suppose it would make sense that it would fly rough in spots of the field where it was more windy.???

Took off for another flight, gained height real quick with power on then lost total radio contact, she flipped over went in full bore inverted.

When I was sweeping up the wreckage I noticed the crystal was out of the receiver, so I pushed it back in, it’s a good tight fit so was baffled as to how it had come out.
When I showed the wreck to a guy at the field, he was concerned as to how I had mounted the receiver by sticking it to the inside fus wall with a couple of layers of double sided sponge tape. His issue was with vibration that can occur. Does anyone think this can cause loss of signal, is this sort of practice a definite no no?
I know my radio gear to be spot on as it has well over 200 flight in my Extra and I am now worried about putting it back in the Extra for fears of repercussion.

We range checked the radio gear on the ground after the crash and no problems were detected.
I am thinking now with regards to the sanwa gear that was previously in the plane, could I of had radio interference there too as the receiver was mounted the same way, or is there two issues here. I am confused to say the least.



Any feedback would be greatly appreciated.