Fuel economic boats?

Discussion in 'Boat Design' started by tom_fry24, Dec 27, 2006.

  1. tom_fry24
    Joined: Sep 2006
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    tom_fry24 Junior Member

    I've been reading through the threads regarding the use of sail vs engine for long distance journies (from what i can gather it costs about the same to run/maintain the boat) but i've been unable to find an approximate distance per liter obtained by an economic diesel boat. I only ever sail so I have no concept of how far a motor powered (+/- 50 foot) boat can travel on one tank or how big the tanks are. Can any one give me a general idea? thanks for your help in advance.
  2. Grant Nelson
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    Grant Nelson Senior Member

  3. Lyle Creffield
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    Lyle Creffield Junior Member

    Fuel efficiency

    Here's two sets of figures to ponder

    11metre, cat, power semi-displacement 18kns 18lts per hr

    mono, sloop, 15t (metric) 55hp yanmar, var. pitch, 14.4m LWL
    predicted (@41hp,2000RPM) 8kns - 4lts per hr

    There is also another mono quoted on boat design but i am unable to find which is very low fuel consumption from a Sabre
  4. Mikey
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    Mikey Senior Member

    Dave Gerr's "The Nature of Boats" has diagrams and information how speed, displacement and hull form affects fuel consumption, also a fun book to read

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    FAST FRED Senior Member

    Speed is what costs money.

    If you are willing to travel at SQ Rt LWL X .8 only about 1 hp per ton of displacement is required.

    With a modern diesel 20 hp can be obtained from a gal of fuel.

    This rule goes out the window if the vessel has an L to B ratio of over about 6 -1.

    They can go about 2x faster on the same fuel.

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