I was flying today from Westray to Papa Westray and durring takeoff roll my engine started going in reverse just as i passed 75 knots and all of a sudden the throttle goes into 100% reverse to forward in 1% and then back to 100% reverse over and over again and i have no control. and the intresting part, so far i just belive it only happens up there on the (worlds shortest airline route) Anyone Else experienced this?