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CPP

Controllable Pitch Propeller

Related Terms

PROPELLER

An arrangement which consists of hub and number of blades mounted on a rigid shaft protruding from the hull of a vessel, usually driven by an inboard motor.

INBOARD MOTOR

An engine mounted within the hull of a vessel, usually driving a fixed propeller by a shaft protruding through the stern. Generally used on larger vessels. See also stern drive and outboard motor.

FIXED PROPELLER

A propeller mounted on a rigid shaft protruding from the hull of a vessel, usually driven by an inboard motor; steering must be done using a rudder. See also outboard motor and sterndrive.

PROPELLER WALK

The tendency for a propeller to push the stern sideways. In theory a right hand propeller in reverse will walk the stern to port.

TAILSHAFT

A kind of metallic shafting (a rod of metal) to hold the propeller and connected to the power engine. When the tailshaft is moved, the propeller may also be moved for propulsion.

STERNDRIVE

A propeller drive system similar to the lower part of an outboard motor extending below the hull of a larger power boat or yacht, but driven by an engine mounted within the hull. Unlike a fixed propeller (but like an outboard), the boat may be steered by twisting the drive.

SHEAR PIN

A safety device, used to fasten a propeller to its shaft; it breaks when the propeller hits a solid object, thus preventing further damage.

SCREW

1. propeller. 2. propeller-driven.

BOW THRUSTERS

A propeller at the bow of the ship, used during maneuvering to provide transverse thrust

STERN FRAME

Large casting attached to th after end of the keel, incorporating the rudder gudgeons and propeller post in single-screw ships
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