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PROPELLER SYNCHRONIZER
The propeller synchronizer matches propeller RPM of the
two engines on the aircraft.
The propeller RPM of the slave
(right) engine will follow changes in RPM of the master
(left) engine over a limited range.
This limited range
feature prevents the slave engine losing more than a fixed
amount of propeller RPM in case the master engine is feath-
ered with the synchronizer
ON.
The synchronizer switch in
the OFF position will automatically actuate the synchronizer
to the center of its range before stopping, to insure that
the control will function normally when next turned on.
The
system indicator light should light when the synchronizer
switch is in the
ON
position.
In addition to maintaining propeller synchronization and
elimination of the unpleasant audio beat accompanying unsynch-
ronized operation, the propeller synchronizer can also pro-
vide a significant reduction in cabin vibration by maintain-
ing an optimum angular or phase relationship between the two
propellers.
With the propeller slightly out of synchronization so
that an audio beat is obtained approximately once each
5
seconds, it should be noted that the vibration level of the
cabin and instrument panel will increase and decrease at a
rate of approximately once each
20
seconds.
Optimum opera-
tion will be obtained by manually synchronizing the propel-
lers and engaging the synchronizer during the period of
minimum vibration.
The angular relationship of the propel-
lers should be maintained for extended periods of time unless
disturbed by moderate atmospheric turbulence.
7-14
NOTE
e
Manually synchronize and phase the engines
prior to switching the propeller synch-
ronizer system ON.
e
The propeller synchronizer must be switched
OFF during takeoff, landing and single-
engine operation.
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