
Design concepts of propulsion systems
24
Controllable pitch
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, Water Jet.
Surface drive
Controllable pitch is used as an alternative to a fixed
propeller. The pitch of the propeller blade is normally
regulated by means of a built-in function in the re-
verse gear.
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 rud-
der arrangements or steerable drive unit. At planing
speed the propeller operates with half of its diameter
submerged. At lower speed the propeller is usually
submerged and due to its high pitch torque, has
greater absorption in comparison to a conventional
propeller.
Summary of Contents for D11 series
Page 1: ...Marine Propulsion Diesel Engines Installation 1 1 D E D5 D16 series ...
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Page 208: ...206 References to Service Bulletins Group No Date Concerns ...
Page 209: ...207 Notes ...
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Page 212: ...7748655 English 11 2007 ...