Hi guys,

Well I really have a problem which I can't solve and all our club members are scratching their heads, so if anyone can help it will be much appreciated.

I have 9 different models ranging from small foam park flyers to large 2.2m planes and over the last couple of years I crashed all of them due to erratic elevator control, or should I say lack of control. I would fly the model maybe 40-50 times and all would be well. Then normally during simple straight and level flight I seem to loose elevator control and the model will start pitching violently up and down much like a porpoise and it will end up in the crash.

I had second hand radio transmitter and I thought that it might have a intermittent fault so I bought brand new radio and guess what I had my first crash today, same problem as before, so it is not the radio.

The new radio is JR XG14, all my receivers are JR brand and servos are either JR or Futaba, no cheap Chinese gear.

It is happening on all of my models and models would fly nicely for long time and then bang, up and down like a yo yo and down I go.

If any one of you would have any suggestion please let me know as I am almost ready to give up, thanks Jan