constant speed units
i had a small problem the other weekend with an aircraft that i hired for the day.
the aircraft was a complex type and had a vp prop. prior to t/off we did all of the usual power / prop checks and everything was okay.
the take off roll was fine and we had max rpm. all of a sudden at abt 200ft we lost abt 300rpm for a split second and then the rpm returned to its original setting. it happen repeatedly again. we reduced manifold pressure and tried to control the prop surges by feathering the prop but the surges still continued albeit not as violently.
needless to say that we made a very hasty low level circuit, landed, and made our own way home!
the csu unit was later replaced and apparantly everything is now okay.
does someone with a knowledge of the csu explain to me what probably went wrong and why it only seemed to be an intermittent problem.