hull design

Discussion in 'Boat Design' started by Nakis, Jul 14, 2010.

  1. Nakis
    Joined: Jul 2010
    Posts: 2
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    Location: Greece

    Nakis New Member

    i wonder if a hull will be as a W , (instead of a V ), with 2 large Vs and in their join , to have many small hoses to offer press air under the hull with an angle to the back of the boat.

    Do you think that the millions of air bubbles will reduce the abrasion of the boat on the water??

    In the joint of the 2 Vs , will be created a corridor from the front up to the back side of the boat full of air.

    I just wonder....
     
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Old concept. Look up "M" hull or "catheral hull" for high speed boats. Or any power cat or multi-stepped planing boat of the 1920's or 30's for that matter
     
  3. Mild Bill
    Joined: Nov 2007
    Posts: 33
    Likes: 1, Points: 8, Legacy Rep: 11
    Location: Northern Illinois

    Mild Bill Well, not entirely mild.

    For starters:

    http://www.boatdesign.net/forums/boat-design/hickman-sea-sled-inverted-vee-2880.html

    http://www.boatdesign.net/forums/boat-design/heres-true-sea-sled-story-circa1985-4654.html

    http://www.boatdesign.net/forums/boat-design/barn-found-hickman-sea-sled-26985.html

    http://www.boatdesign.net/forums/multihulls/cathedral-hulls-22003.html

    I read somewhere once (maybe in one of the above links, or one of the links they contain) that Hickman Sea Sleds and other inverted-V designs were supposed to be fast because they were riding on foam/bubbles created by the wake interacting with the airflow, which foam/bubbles were supposed to have less drag than "solid" water. Though fast, the early Hickman Sea Sleds with vertical sides (i.e. like an upside-down 'M') were reportedly susceptible to tripping while turning sharply at high speeds, the cure for which was to add a bevel to the outside edges, which would resemble your proposal for a 'W' hull.

    As for venting compressed air underneath the hull to increase the quantity of bubbles and maybe add a bit of lift, it might decrease the drag but you have to be aware that it would add considerable cost, increase complexity, add weight, and divert power from the propeller. Those last two will act to slow down the boat, so you may end up with an insignificant improvement in speed in exchange for spending much money.
     
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