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A controllable-pitch propeller A variable-pitch propeller on a fishing vessel. Variable-pitch propellers may be either controllable (controllable-pitch propellers) or automatically feathering (folding propellers). Variable-pitch propellers have significant advantages over the fixed-pitch variety, namely:
However, a fixed pitch propeller (FPP) is both cheaper and more robust than a CPP. Also, an FPP is typically more efficient than a CPP for a single specific rotational speed and load condition. Accordingly, vessels that normally operate at a standard speed (such as large bulk carriers, tankers and container ships ) will have an FPP optimized ...
Lightly loaded propellers for light aircraft and human-powered boats mostly have two blades, motor boats mostly have three blades. The blades are attached to a boss (hub), and while it can be a big boss, it should be as small as the needs of strength allow – with fixed-pitch propellers the blades and boss are usually a single casting.
Closeup of one of USCGC Mackinaw's 3.3 MW Azipod units. Azipod is a trademarked azimuth thruster pod design, a marine propulsion unit consisting of a fixed pitch propeller mounted on a steerable gondola ("pod") containing the electric motor driving the propeller, allowing ships to be more maneuverable.
Schottel Controllable Pitch Propellers can be used in several vessel types like bigger ferries, container ships, heavy lift vessels or offshore supply vessels. The power spectrum includes application up to 30 MW (40,000 hp). The propeller diameters vary between 1.5 and 8.0 m (4 ft 11 in and 26 ft 3 in).
An azimuth thruster is a configuration of marine propellers placed in pods that can be rotated to any horizontal angle , making a rudder redundant. These give ships better maneuverability than a fixed propeller and rudder system.
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