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Mechanical azimuth thrusters can be fixed installed, retractable or underwater-mountable. They may have fixed pitch propellers or controllable pitch propellers. Fixed installed thrusters are used for tugboats, ferries and supply-boats.
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).
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.
The ship has a fully loaded displacement of 3,000 long tons (3,000 t) and a gross register tonnage (GRT) of 2,153 and 693 net register tons (NRT) as built. The vessel is powered by diesel-electric engines (DC/DC) driving two shafts turning fixed-pitch propellers creating 4,250 shaft horsepower (3,170 kW).
In marine propulsion, a variable-pitch propeller is a type of propeller with blades that can be rotated around their long axis to change the blade pitch. Reversible propellers—those where the pitch can be set to negative values—can also create reverse thrust for braking or going backwards without the need to change the direction of shaft revolution.
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.
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