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adjustable propeller[ə′jəs·tə·bəl prə′pel·ər]
A screw propeller with blades that can be rotated around their axes to change the pitch. Also known as controllable-pitch propeller.
A propeller with blades that can be set to a desired pitch on the ground when the propeller is at rest. The pitch of the propeller blades cannot be adjusted in flight. Also known as adjustable-pitch propeller.