| As the name implies, a fixed pitch propeller has the blade
pitch (blade angle) built into the propeller. For that reason the pitch
angle cannot be changed by the pilot, as it can on controllable pitch
propellers. Generally, this type of propeller is constructed of wood or
aluminum alloy (Fig. 2-15).
Fixed pitch propellers are designed for best efficiency at one
rotational and forward speed. They are designed to fit a specific set of
conditions involving both the engine rotational speed and the airplane's
forward speed. Any change in these conditions reduces the efficiency of
both the propeller and the engine. |
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