Science Fair Project Encyclopedia
Kort nozzle
The Kort nozzle is a shrouded, ducted propeller assembly for marine propulsion. The hydrodynamic design of the shroud, which is shaped like a foil, offers advantages for certain conditions over bare propellers.
Kort nozzles can be significantly more efficient than propellers at low speeds, producing greater thrust in a smaller package. For the Bollard Pull it produces about 50% greater thrust per unit power than a propeller. Tugboats are the most common application for Kort nozzles.
The additional shrouding adds drag, however, and Kort nozzles lose their advantage over propellers at about ten knots (19 km/h).
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10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details