SWATH Wind Farm vessel

Discussion in 'Boat Design' started by BMcF, Nov 14, 2016.

  1. BMcF
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    BMcF Senior Member

  2. daiquiri
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    daiquiri Engineering and Design

    AH, but don't they say that the proof of the pudding is in the eating? AH, that saying is so true. ;)

    That is one top-class and cutting-edge vessel indeed, which testifies the top-class technical quality and capabilities of our forum buddy. Which is nothing new, after all. :)
     
  3. BMcF
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    BMcF Senior Member

    I was on hand when she was first put to work. Initially there was a fair amount of pushback from the farm operators..."too big" (she's a bit longer overall than the vessels already working), "too heavy" (she's not, actually, any heavier than numerous of the other transfer vessels) and so on.

    And then she went to work, finally. Blew everyone away. ;)
     
  4. philSweet
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    philSweet Senior Member

    Congrats, and what is the purpose of the white pillars on the deck? Very pretty boat, too.
     
  5. BMcF
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    BMcF Senior Member

    Engine room air intake and exhaust. The engines are high up and forward..easily accessible, especially when compared to some other SWATH designs that have the engines down inside the main hulls.

    A short video here:

    https://www.youtube.com/watch?v=TSb18xKh2DU
     
  6. SamSam
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    SamSam Senior Member

    You gave the name away by posting the link...
     
  7. cmckesson
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    cmckesson Naval Architect

    Very cool Bill! Thanks for posting.
     
  8. BMcF
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    BMcF Senior Member


    Thanks Chris. This one is the first with our new zero-speed motion control for SWATHs; and of course includes the standard suite of SWATH stabilization gear otherwise.

    More to come..including integrated stabilized transfer brows and gangways.
     
  9. cmckesson
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    cmckesson Naval Architect

    What is the effector used to accomplish zero-speed RCS?
     
  10. BMcF
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    BMcF Senior Member

    The fins...leveraging the same basic impulse principle as is used for the now-ubiquitous zero-speed/on-anchor roll control for yachts.
     
  11. cesmith9999
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    cesmith9999 New Member

  12. abosely
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    abosely Senior Member

    Very cool and interesting boat, thanks for sharing.

    What is the difference between a SWATH and a Catamaran type boat?
    I know nothing about SWATH boats. Is it the shape of the hulls or other aspects of the design?

    I have only seen pics of a couple SWATH boats and they had four pylons instead of two continuous type hulls.

    Cheers, Allen
     
  13. Ad Hoc
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    Ad Hoc Naval Architect

    The clue is in the acronym. A swath stands for:

    Small
    Waterplane
    Area
    Twin
    Hull

    Put all together one gets S.W.A.T.H., or commonly termed Swath. The clue is the first 3 letters :)
     
  14. daiquiri
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    daiquiri Engineering and Design

    Now that you made me think of it...
    I've always thought that submerged torpedo-like hulls are the main distinctive feature of a SWATH, and that the small waterplane area is a consequence of having the biggest part of the volume displacement in the torpedoes.

    But if, on the contrary, the main feature of a SWATH is the small waterplane area, then where does a catamaran end and SWATH start? Is there a rule (of thumb or some other body part) which says: this is the red line - up till here it is a very slender cat, from here on it is a SWATH?
     

  15. Ad Hoc
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    Ad Hoc Naval Architect

    Yes there is :D

    And it is ostensibly a measure of the vessel restoring force.

    For a swath there are several rules of thumb, but basically if the waterplane area, Aw, divided by the displacement to the power of (2/3) is less than 1.5 it is a swath. Another simple one is if Aw< 2xDispl^(2/3) ...basically same thing.

    What you will fidn is that big ships like the QM2 and small sailing dinghies all have their Aw/Displ^(2/3) WPA-Ratio around 5-6. The so called-semi-swath is just in name only. As there is no such thing as a semi-swath. Can you dig a hole...yes...can you dig half a hole..??!! Either is it a hole or it is not. Either it is a Swath or it is not. The hydrodynamics don't lie! Thus semi-swaths are in name only....because in reality if you check their WPA-ratio it is around 3.4-4.0....way way off being a swath. They should be called semi-catamarans or just slender hull catamarans, nowt else.

    But hey those guys in sales and marketing will call anything semi-something if it gets them interest ;)
     
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