Pentamaran Ferry

Discussion in 'Boat Design' started by kach22i, Dec 13, 2007.

  1. kach22i
    Joined: Feb 2005
    Posts: 2,418
    Likes: 111, Points: 63, Legacy Rep: 1222
    Location: Michigan

    kach22i Architect

    Pentamaran
    BMT ro-pax


    RFI: If anyone has time to do some searching on Google or has information on this topic, please post it.

    From what I've read BMT is in the advanced stages of design for an in the USA east and Gulf of Mexico coastal route 40 plus knot 175 trailer or 75 trailer plus 500 car and 1,800 passenger ship.

    See the last page of this PDF:
    http://media.bmt.org/bmt_media/resources/1/Focus2007Issue1.pdf

    First found here:
    http://www.bmt.org/Search/index.asp

    More news (year old):
    http://www.ngal.co.uk/News/?/0/0/135
    A picture would be nice. :)

    EDIT:
    http://testngal.bmthq.com/?/344/256/175
    Could be 4th one down?
    [​IMG]
     
  2. PI Design
    Joined: Oct 2006
    Posts: 673
    Likes: 21, Points: 0, Legacy Rep: 328
    Location: England

    PI Design Senior Member

  3. kach22i
    Joined: Feb 2005
    Posts: 2,418
    Likes: 111, Points: 63, Legacy Rep: 1222
    Location: Michigan

    kach22i Architect

    Thank you very much PI Design, I now have a much better idea of what is going on.

    However I'm now puzzled on why the thin side wall sponsons are broken up in the middle like that. I suppose the craft may not be able to turn very well with just a single long sponson/fin each side of the main slender hull. That's just a first guess though.

    I've seen pictures of this ship or something similar before, but it totaly slipped my mind. The other drawings were sketchy artist renderings or simple computer renderings (well done) if I recall correctly.
     
  4. PI Design
    Joined: Oct 2006
    Posts: 673
    Likes: 21, Points: 0, Legacy Rep: 328
    Location: England

    PI Design Senior Member

    'Cos it would only be a trimaran otherwise :rolleyes: . Seriously though, the idea is that the centre hull is quite narrow (for less drag) and the aft sponsons are just submergerged at the design waterline. The forward sponsons are above the static waterline and only sumberge (and hence provide stability) when the ship rolls/lists. This reduces the wetted surface area of the (upright) hull form and hence reduces drag. Its all about not having any more ship in the water than you need. Of course, you could have 3, 4 or 20 sponsons each side, each stepped slightly higher above the waterline than the previous one. Taking this to its logical extreme, you would have a single continuos sponson which raked up as it went forward. But that's a trimaran...

    There are other advantages, such as good survivability charecteristics.
     
  5. kach22i
    Joined: Feb 2005
    Posts: 2,418
    Likes: 111, Points: 63, Legacy Rep: 1222
    Location: Michigan

    kach22i Architect

    I saw on the drawing that the forward sponsons looked higher, but I did not know what to make of it.

    Thank you once again for explaining the design intent.:)
     
  6. BMcF
    Joined: Mar 2007
    Posts: 1,195
    Likes: 195, Points: 63, Legacy Rep: 361
    Location: Maryland

    BMcF Senior Member

    No kidding...I've worked with Eddie, John, Nigel and crew for almost 20 years now..most recently on the USN X-craft project, but previously on their Beliyard and Samsung SES, etc. Their Pentamaran concept is being plugged for the Short Sea Shipping/Marine Highway iniatives that are gaining some momentum these days.

    Sorry for hijack..

    -Bill McFann
     
  7. brian eiland
    Joined: Jun 2002
    Posts: 5,090
    Likes: 219, Points: 73, Legacy Rep: 1903
    Location: St Augustine Fl, Thailand

    brian eiland Senior Member

    PDF on Pentamaran Hull Form

    Here's an interesting PDF someone posted on another forum recently
     

    Attached Files:


  8. kach22i
    Joined: Feb 2005
    Posts: 2,418
    Likes: 111, Points: 63, Legacy Rep: 1222
    Location: Michigan

    kach22i Architect

    Thanks, at 31 pages long I'll just view this document on-screen and not print it out. This is not the short haul coastal shipping thing, across the Atlantic 5-day fast shipping is intriguing.

    I bet the design will do good against rouge wave too.
     
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.