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#2
03-29-2011, 05:39 AM
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| Lex, as with a "conventional" open propeller, efficiency of a waterjet depends on the particular operating point. At zero boatspeed (bollard pull condition) efficiency is zero. With increasing speed it rises to a maximum value somewhere in the range of 50 to maybe 60% and then declines to zero again when the vessel approaches a speed at which the jet cannot produce thrust any longer. You might find the following paper an interesting read (I did  ): MacPherson, Donald M., "Selection of Commercial Waterjets: New Performance Coefficients Point the Way", SNAME New England Section, February 2000Hope this helps...
__________________ All the best, Olav GER-1045 ____/)_/)/)___  |
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#3
03-29-2011, 08:41 AM
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| Thanks, I wil look into this pdf file. I have got some information that the efficiency will vary between 50 and 56 %. This depends on the speed. The faster the more efficient. I keep looking into the matter and will report back. Lex |
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