RE: YAK 54 Crash during maiden flight
zul - do a range check. It might be the way you fly. You may have lifted off too slow. To be frank a full 40 sized scale aerobatic plane is not all that happy with a Saito 56, something like a SE 5 is ok but not a scale aerobatic plane that has tapered wings. You MAY have stalled, that is why the plane dropped a wing and you felt no controls. When you stall there is no control as there insufficient air over the control surfaces.
If everything seems ok after the crash then its either a glitch, bad connection or a stall ... I think its a stall ... you were too slow or climbed out at too steep an angle. Next time let the plane have a longer roll out and when it starts to twitch you know she wants to lift off then rotate her and climb at about 15 degrees only.