A magnetic wand and hammer serve as a
propeller track indicator.
cancel these imperfections. On a wood
propeller, reinstalling and retorquing the
bolts may clear up tracking problems. If
not, or if the tracking gets worse, remove
the propeller and look for other causes.
If there is a spinner bulkhead
mounted between the crankshaft and
propeller, check this first. Your bulkhead
may be thicker on one side than the other.
This is especially true on fiberglass bulkheads, but it can occasionally be a
problem with aluminum ones. Shim the
propeller with thin card stock on the side
with the blade farthest toward the rear, or
replace the bulkhead.
If there is no bulkhead or if it is okay,
use a dial indicator to make sure the
crank flange is true.
Check the track each time you install
the propeller. For wood propellers, the
mounting torque should be checked with
each seasonal change in the weather.
Different temperature and humidity conditions will affect a wood propeller and
will change the mounting torque. If the
propeller becomes loose, you will soon
have a failure of the hub!
© 2010 Cobham plc. All rights reserved.
Powerful and precise, with
ultra-easy installation.
Cobham Avionics
Communications
6400 Wilkinson Drive
Prescott, AZ 86301 USA
1-928-708-1550
sales.prescott@cobham.com
www.cobham.com/avionics
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