efficiency of jets

Discussion in 'Jet Drives' started by Lex47, Mar 29, 2011.

  1. Lex47
    Joined: Dec 2010
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    Location: Holland

    Lex47 New Member

    Can anyone tell me the efficiency of waterjets.

    Regards
    Lex
     
  2. Olav
    Joined: Dec 2003
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    Location: Filia pulchra Lubecæ

    Olav naval architect

    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 2000

    Hope this helps...
     
  3. Lex47
    Joined: Dec 2010
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    Location: Holland

    Lex47 New Member

    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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