Re: What is "synchronizing" propellers and why was it done?

Date:         17 Dec 97 11:10:46 
From:         Bob Mann <>
Organization: R.W. Mann & Company, Inc.
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Multi-engine equipment used electrical or mechanical propeller synchronizers,
phasers and in some cases, combined synchro-phasers, to reduce the frequency
and magnitude of vibrations associated with "beating" of propellers that were
out of speed and phase (angular/rotational) synchronization.  Reduced
vibration contributed to lower cabin noise and lower vibration/cycle fatigue.
Phasing was the later innovation, and common on larger-bladed equipment like

- Bob Mann

Bob Mann
office 516-944-0900, fax-7280,