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 TM 55-1905-217-34
ME 1905-217-34/5-2
Figure 5-2. Penning propeller on anvil.
(4) Making and Using Pitch Block. A pitch block can be made by pouring concrete in a plywood box and
shaping the upper surface of the concrete to fit a new propeller. Figure 5-3 shows a badly damaged propeller
on a block before straightening. Figure 5-4 shows the propeller on the pitch block after straightening. In figure
5-4 the upper edges of the blade are about an inch above the pitch block. This is because the pitch block is for
a propeller with a pitch of 17 inches, whereas the propeller is a 24-inch diameter propeller with a pitch of 18
inches. An efficient blacksmith with an eye for blade configuration can determine the amount of shaping and
pitch alinement.
5-2
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