Spray strake arrangments

Discussion in 'Powerboats' started by Brooks Dees, Dec 3, 2009.

  1. Brooks Dees
    Joined: Dec 2009
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: San Francisco

    Brooks Dees New Member

    Anyone know the advantages/disadvantages of arranging the spray strakes aligned with the buttucks vs the diagonals?

    just curious.
  2. Timm
    Joined: Aug 2002
    Posts: 107
    Likes: 2, Points: 0, Legacy Rep: 64
    Location: Crystal River, FL USA

    Timm Senior Member

    The only thing I have ever heard was from my days at Bertram. Our designer there told me they changed from the ones along the butts because they tended to throw water forward as the bow came down into a sea. This would make the boats run wetter on windy days. On a very high speed boat, it may be better to have them follow the butts as it will help with directional stability.

    On large heavy hulls, it may not even make sense to have them other than for spray control.
  3. Eric Sponberg
    Joined: Dec 2001
    Posts: 2,019
    Likes: 232, Points: 73, Legacy Rep: 2917
    Location: On board Corroboree

    Eric Sponberg Senior Member

    Generally, what I have seen, is that on the more successful boats, the strakes always run along the buttocks aft of amidships. But going forward, they tend to curve up and inward, essentially splitting the distance from keel to chine into equal parts. This is a compromise that works to limit spray and maintain performance.

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.