I used one a long time ago on a P120 powered Kangaroo. I set the speed limiter at 175mph and the 120 was set for max rpm. It was very cool. You could come through strait and level and hear the turbine just turning enough to hold the speed....then I would pull vertical and you could hear the turbine revving up to hold the 175 going straight up. Put lots of flights on it with no issues. .