PROPELTER
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
(Ieft)
engine
over a limited
range. This
Iimtted
range
feature
prevents
the slave
engine losing
more
than
a fixed
amount
of
propeller
RPM
in
case the
master engine is feathered
with
the
synchronizer
on. The synchronizer
switch
in
the OFF
position
will
auto-
matically actuate
the
synchronizer
to
the
center of its
range before
stop-
ping,
to
insure that the
control
wil-l function
normally
when
next
turned on.
The system
indicator
tight
should
light when the
synchronizer switch
is in
the ONposition.
In
addition
to
maintaining
propeller
synchronization
and elimination
of
the unpleasant
audio
beat
accompanying unsynchronized
operatron,
the
propeller
synchronizer
can,also
provide
a signifieant
reduction in cabin
vibration
by
maintaining an;optimum
angular or
phase
relati.onship
be-
tween
the
two
propellers.
With the
propellers
slightly out
of
synchronization
so
that
an audio beat
is
obtained
appro<imately
once
each
5
seconds, it should be
noted
that the
vibration
level
of
the cabin
and instrument
panel
will increase and de-
crease
at a rate of approximately
once
each 20 seconds. Optimum opera-
tion will
be
obrtained
by
manually slmchronizing
the
propellers
and
enpg-
ing t}le synchronizer during
the
period
of minimum, vibration. The
an-
gular
relationship
of
the
propellers
should
be
maintained
for
extended
periods
of
time unless
disturbed
by moderate atmospheric turbulence.
NOTE
O
Manually
synchronize
the
RPM
of the
engines
prior
to switching
the
propeller
slmchronizer
sys-
tem ON.
a The
propeller
slmchronizer must
be'switched
off
during takeoff and landing
and single-engiae
operation.
l-o
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