Question

Explain how propeller synchronization system works and also how the Synchrophasing system works. What are the benefits?

Answer 1

Propeller Synchrnizer System:

Many multiengine airplanes have a propeller synchronizer installed to eliminate the annoying drumming or beat of propellers whose rotation speed are close but not precisely the same. To use the prop syn, the propeller rpm are coarsely matched by pilot and system is engaged. The pro sync adjusts the rpm of slave engine to precisely match the rpm of master engine. and then maintains the relationship. The prop syn should be disengaged when the pilot selects a new propeller rpm then reengaged the engine after the new rpm is set. The pro sync should always be off for takeoff, landing, and single engine operation.

Propeller Synchrophaser:

A variation on the propeller synchronizer is the propeller synchrophaser. Prop synchrophaser acts much like a synchronizer to precisely match rpm but synchrophaser goes one step further. It is not only matches rpm but actually compares and adjusts the positions of individual blades of propeller in their arcs. There can be significant propeller noise and vibrations reductions with a propeller synchrophaser. From the pilot's perspective operation of propeller synchronizer and a propeller synchrophaser are very similar.