In years past we had a problem with the prop governor on an aerobatic plane.
Never totally fixed it until we sold the aircraft to a mechaninc who zeroed in on an oil feed to the governor issue.
He added an oil pressure accumulator and solved the problem.
Edit : Now I seem to remember the origin of the problem was with the oil pickup in the sump, that was not the exact model it should have been.
Still boils down to an oil pressure issue, though.
Last edited by Fly Aiprt; 4th June 2019 at 20:53.
Reason: Typo, addition