109 engine load vibration

[smokincrater]

That`s the rotol airscrew, much more performance than the two speed screw. The two speed of course was fine speed for all operations ( take off, climb and top speed and compression diving) and the course speed for cruising and economy. The two speed is a good 60 mph slower than the constant speed. I must admit I don`t know the difference between the airscrews but one would would think that the two speed in fine speed would be little different for the top speed and climbing(as the aircraft would be optmised for performance)and the real difference would be in the coruse setting where the constant unit would be a lot better for economy and engine life management, considering the mission of the aircraft.

The original aircraft had a fixed wooden unit, the aircraft was a real dog but was brought to life when the aircraft was fitted with the two speed unit and then the constant speed unit.

If anyone has any information about the different airscrews and the difference in performance I would love to know.