On Mon, 03 May 2004 19:32:21 GMT, (Ben Jackson) wrote:

My IO-540 with Hartzell compact 2 blade prop is smoother at 2700 RPM
than at cruise (2200-2400 RPM). If I have it dynamically balanced at
cruise will it vibrate more at climb power? Does the fact that it's
smooth at climb power suggest that the engine/prop combo is okay and
there is a problem elsewhere (mounts, etc)?

How do you know it's the engine? Sometimes there can be vibration in the
airframe at various speeds and/or AOA's.

But it's not unusual for an engine/prop combination to have a "sweet spot".

If your prop has not been balanced, it's a good idea to start there.


Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)