data for drag increase in different sea states

Discussion in 'Boat Design' started by singleprop, Sep 15, 2009.

  1. singleprop
    Joined: Mar 2008
    Posts: 49
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Hong Kong

    singleprop Junior Member

    Are there any data available that describes hull drag changes with different sea-states, i.e horsepower required in different sea-states

    It is obviously dependent on hull shape.

  2. Leo Lazauskas
    Joined: Jan 2002
    Posts: 2,696
    Likes: 151, Points: 63, Legacy Rep: 2229
    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    It also depends on where the waves are coming from, (e.g. head, quartering, or beam etc), the spectrum of the waves, whether they are long-crested or short...

    I'm not sure if there are any tables that might help you, but some old free(ish) codes like SMP (Ship Motion Program) can give rough estimates. A search for "added resistance", "ship motions" and authors names such as Salvesen, Tuck, Faltinsen, Joosen, and Sclavounos might turn up something of use.

Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.