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Tunnel thrusters are primarily used for docking, slow speed
maneuvering, emergency steering and station keeping at zero or
slow forward speed. Tunnel thrusters are installed transversely
in the bow or the stern of a vessel.
Electric drive tunnel thrusters with fixed
pitch propeller are available from 250 to 10,750 HP (180kW to
8.0MW). They are designed for variable speed electric motor
input, either DC with SCR control systems or AC with variable
frequency drives. Most electric tunnel thrusters are used
in dynamic positioning applications and where there is an abundance
of electrical service already available.
Engine driven tunnel thrusters for direct
engine drive are available in the range of 250 to 3,000 HP.
The engine must be provided with a marine gear with a reduction
ratio to match the input speed of the thruster. A cardan
shaft connects between the output shaft of the marine gear and
the input shaft of the thruster.
Thrustmaster offers a great line of
tunnel thrusters from 35 to 3,000 HP. They are used
all over the world, many of them in dynamic positioning applications.
Many models have ABS Type Approval. Thrustmaster hydraulic tunnel
thrusters are available from 35 to 2,000 HP. Geared tunnel thrusters
for electric or direct engine drive are available from 250 to