bullnose hull design

Discussion in 'Boat Design' started by edwinarmes, Jan 2, 2014.

  1. edwinarmes
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    edwinarmes New Member

    I am planning to build another all aluminum house boat. I am considering adding a bull nose concept to the bow in an effort to decrease the fuel consumption. do you have any input or help?
    thx ed
     
  2. Rearic
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    Rearic New Member

    that's interesting, how big are you thinking?
     
  3. edwinarmes
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    edwinarmes New Member

    54' & 13 wide
     
  4. messabout
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    messabout Senior Member

    Bullnose: Do you mean a rounded or semispherical bow section? That might help a little bit. What you do with the buttocks may have more influence than nose pieces. Here it is presumed that you are not anticipating more than 6-8 MPH operating speed.

    Being extremely stingey with all up weight is a major key to operating economy. For every pound of boat it must push a pound of water out of the way. Reject granite counter tops, cast iron bathtubs and other weighty luxuries.
     
  5. Mr Efficiency
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    Mr Efficiency Senior Member

    Presumably he's talking about a bulbous bow, as used on large ships ? If so, it would be just a waste of time, imo.
     
  6. edwinarmes
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    edwinarmes New Member

    bull nose like on cargo ships bow. I know weight is issue. everything will be aluminum. i'm looking for info on how the nose to boat contour will occur
     
  7. Stumble
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    Stumble Senior Member

    Edwin,

    These types of bows are only effective at a very narrow range of speed, and every speed requires a different bulbous shape. Even on freighters they are hard to get right and require substantial flow analysis to design. I doubt that a recreational build would be capable of justifying this level of design work given the limited amount of underway time you will see.
     

  8. edwinarmes
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    edwinarmes New Member

    thanks much for the input. Maybe I will go with traditional bow shape.
     
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