I maidened my UCD last weekend. I have JR DS 8455's all round on 6V with an OS surpass .91 for power. Looks like this plane will be loads of fun. Can't wait for the motor to be run in. Only problem I had was the usual fuel running into the carby when not being used and the cover on the bottom of the wing came off. Apart from that it was all good. CG is set 1/2 inch forward of the back limit.