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 TM 55-1905-221-14-3
6-16
PROPELLER, PROPELLER SHAFT, AND STUFFING BOX (Continued)
LOCATION/ITEM
ACTION
REMARKS
REPAIR (Cont)
leather under the hammer when
the blade is at the correct
temperature. Work should be
stopped and the propeller
reheated when the sound of
the metal under the hammer
changes from a dull, flat
sound to a sharper, ringing
sound. Most blades can be
reshaped with two or three
heatings. During straight-
ening operations the
propeller should be compared
occasionally to a propeller
pitch block.
e. Making and Using a Pitch
Block. A pitch block can be
made by pouring concrete
in a plywood box and shaping
the upper surface of the con-
crete to fit a new propeller.
The figure below shows a
badly damaged propeller on a
block before straightening.
6-176
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