Design concepts of propulsion systems
21
Water Jet
Water Jet drives work according to principles of jet
propulsion. A jet of water is generated whose thrust
sets the vessel in motion.
There are different types of water jets, a direct drive or
one with a marine gearbox enabling clutch in/out and
backflushing the system for cleaning purposes. See
Installation and application guide for Water Jet.
Surface drive
A number of surface piercing propeller systems are
available on most markets. These systems are aimed
at high speed applications where the systems are
highly efficient. The systems are available with rudder
arrangements or steerable drive unit. At planing speed
the propeller operates with half of its diameter sub-
merged. At lower speed the propeller is usually sub-
merged and due to its high pitch torque, has greater
absorption in comparison to a conventional propeller.
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