tunnel slot design?

Discussion in 'Boat Design' started by Vulkyn, Sep 4, 2010.

  1. Vulkyn
    Joined: Jun 2010
    Posts: 597
    Likes: 46, Points: 28, Legacy Rep: 654
    Location: Egypt

    Vulkyn Senior Member

    Ran into designs for tunnel slot speed boats. Having never seen one or read about one i was curious what advantage they might have over mono hull v planning hull speed boats ....
     
  2. Questor
    Joined: Aug 2010
    Posts: 202
    Likes: 2, Points: 0, Legacy Rep: -25
    Location: Canada

    Questor Senior Member

    What is a tunnel slot speed boat ? Do you have pictures ?
     
  3. Vulkyn
    Joined: Jun 2010
    Posts: 597
    Likes: 46, Points: 28, Legacy Rep: 654
    Location: Egypt

    Vulkyn Senior Member

    Its like a catamaran but the hulls are much closer. Looks like a mono hull with the bottom middle part removed :D
     

    Attached Files:

  4. Questor
    Joined: Aug 2010
    Posts: 202
    Likes: 2, Points: 0, Legacy Rep: -25
    Location: Canada

    Questor Senior Member

    That's the same hull design as my dollar store, battery powered kitchen sink research vessel.
     
  5. Vulkyn
    Joined: Jun 2010
    Posts: 597
    Likes: 46, Points: 28, Legacy Rep: 654
    Location: Egypt

    Vulkyn Senior Member

    Good for your kitchen sink vessel ...

    So any 1 know of this design ?
     
  6. Vulkyn
    Joined: Jun 2010
    Posts: 597
    Likes: 46, Points: 28, Legacy Rep: 654
    Location: Egypt

    Vulkyn Senior Member

  7. Jeff
    Joined: Jun 2001
    Posts: 1,368
    Likes: 71, Points: 58, Legacy Rep: 923
    Location: Great Lakes

    Jeff Moderator

    It reminds me a little of the split-vee hulls from 25-30 years ago. (e.g. the arnow 27 split vee or the arnow 39 "blue thunder" sold to customs) - but even less tunnel. Around that time a couple builders were doing something like this -- e.g. from the 1981 wellcraft brochure (attached) the cougar cat (I don't think there were many of these sold here)
     

    Attached Files:

    1 person likes this.
  8. Vulkyn
    Joined: Jun 2010
    Posts: 597
    Likes: 46, Points: 28, Legacy Rep: 654
    Location: Egypt

    Vulkyn Senior Member

    Hmmm .... i havent seen any tunnel designs recently, the pics i found are from Glen-L fiberglass design. Looks like old designs too.
     
  9. yipster
    Joined: Oct 2002
    Posts: 3,486
    Likes: 96, Points: 58, Legacy Rep: 1148
    Location: netherlands

    yipster designer

  10. Vulkyn
    Joined: Jun 2010
    Posts: 597
    Likes: 46, Points: 28, Legacy Rep: 654
    Location: Egypt

    Vulkyn Senior Member

    Thx ! I still do not see if it has any major advantage for speed boats (not racing boats).
    For example do they provide addition stability, greater comfort or speed only?
     
  11. yipster
    Joined: Oct 2002
    Posts: 3,486
    Likes: 96, Points: 58, Legacy Rep: 1148
    Location: netherlands

    yipster designer

  12. Vulkyn
    Joined: Jun 2010
    Posts: 597
    Likes: 46, Points: 28, Legacy Rep: 654
    Location: Egypt

    Vulkyn Senior Member

    If it floats, has an engine then i love it :D However i am more interested in the every day main stream application rather than specialized fields like racing, or speed records etc...

    Very interesting read !! I thought only hydrofoil utilized air lift principles.

    The picture i posted does not seem like a tunnel design, there is simply not enough space to create the lift effect and the 2 hulls are very close to each other.
    It looks like a squeezed catamaran design. It does seem to my untrained eyes that kind of configuration will have better stability and less tendency to roll. It would also seem that the amount of power needed for a certain speed could be lower than a normal mono hull.
    However it might have less weight carrying capacity.
    (just my ranting)

    Thx for ur links yipster keepem coming please :D
     
  13. yipster
    Joined: Oct 2002
    Posts: 3,486
    Likes: 96, Points: 58, Legacy Rep: 1148
    Location: netherlands

    yipster designer

    your right, getting into and over hullspeed you mean
     
  14. Vulkyn
    Joined: Jun 2010
    Posts: 597
    Likes: 46, Points: 28, Legacy Rep: 654
    Location: Egypt

    Vulkyn Senior Member

    So if i had a choice between 2 almost identical speed boats for cruising and water sports, why would i choose a tunnel design over a normal hull?

    That's what im trying to figure out ! :D
     

  15. daiquiri
    Joined: May 2004
    Posts: 5,373
    Likes: 255, Points: 93, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    I just love the styling of the 70s. I find this boat's lines so simple, yet very appealing.
     
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.