Cored Structures in the Slam zone of High Speed Craft / Patrol Boats

Discussion in 'Class Societies' started by blackfeather, Aug 23, 2010.

  1. blackfeather
    Joined: Feb 2009
    Posts: 3
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Juneau, Alaska

    blackfeather New Member

    Just a quick query out there - is anyone familiar with which (if any) scantling rules will allow cored bottom plating in the slam zone of High Speed Craft / Patrol Boat?
     
  2. apex1

    apex1 Guest

    Why should one be so mad to do that?
     
  3. idkfa
    Joined: Sep 2005
    Posts: 329
    Likes: 6, Points: 18, Legacy Rep: 79
    Location: Windward islands, Caribbean

    idkfa Senior Member

  4. apex1

    apex1 Guest

  5. blackfeather
    Joined: Feb 2009
    Posts: 3
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Juneau, Alaska

    blackfeather New Member

    The question has been answered. We can get it past DNV, ABS or BV. I was just looking for feedback from anyone who had recently pushed a cored bottom plate structure through any of these class rules. Thanks.
     
  6. Palmer
    Joined: Nov 2002
    Posts: 53
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Tacoma, Wa

    Palmer Junior Member

    I can't guarantee that the new 140' 30kn coast guard cutter built by Westport is cored in the 'slam zone' but I bet it is.
     
  7. Ad Hoc
    Joined: Oct 2008
    Posts: 6,454
    Likes: 530, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    Cored structures, in the slamming zone, with DNV, for example, must have a miniumum density of 130 kg/m^3.
     
  8. powerabout
    Joined: Nov 2007
    Posts: 2,906
    Likes: 61, Points: 48, Legacy Rep: 719
    Location: Melbourne/Singapore/Italy

    powerabout Senior Member

    if you core the success or failure is down to the layup, the chemicals and who did it
     
  9. apex1

    apex1 Guest

    ...and the core of course.:cool:
     

  10. BMcF
    Joined: Mar 2007
    Posts: 976
    Likes: 46, Points: 28, Legacy Rep: 361
    Location: Maryland

    BMcF Senior Member

    I was just going to mention DnV. I mean heck, I've been involved in building DnV-approved cored composite hulls (100% cored everywhere) in Norway for 25 years now. The Norwegian Navy 47-meter 65-knot fast attack craft are frp-sandwich hulls..so are their 54-m mine countermeasure vessels. Not a square inch of single skin laminate to be found anywhere.

    That said..the other class societies than DnV have only more recently been considering designs that are cored below the waterline and/or on other structures (like the cross-deck on catamarans) that are are subject to slamming.
     
Loading...
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.