What is world's biggest planning hull boat and how fast?

Discussion in 'Boat Design' started by Squidly-Diddly, Sep 16, 2020.

  1. Squidly-Diddly
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    Squidly-Diddly Senior Member

    Is there some outside limit to conventional planning hull size and weight?

    Is it same reason we only have giant ants in the movies? Something to do with area/volume ratios and force of waves smacking?

    Any semi-conventional planning or semi-planning hull in the 200tns+ range able to do 60knts?

    Anyone doing super-fast super-yachts or super-fast really big yachts?

    Is this about the best combo of high speed and size?Albatros-class fast attack craft - Wikipedia https://en.wikipedia.org/wiki/Albatros-class_fast_attack_craft 2 knots slower than prior class but almost 2x big at 390tons. Next class was much slower at 25knts and 1700tons, basically a different animal unless Wiki is wack which it sometimes is.
     
  2. bajansailor
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    bajansailor Marine Surveyor

    There are some pretty big and fast (50+ knots) motor yachts in this collection -
    https://www.boatinternational.com/luxury-yacht-life/owners-experiences/james-bond-boats--27897

    The fastest big yacht in the world now is apparently 'Foner' - 41 metres long, with a maximum speed of 70 knots (yikes!) - she is the last one in this list -
    Ten Of The Fastest Super Yachts On The Water In 2020 | Tess Electrical LLC https://www.tessllc.us/ten-of-the-fastest-super-yachts-on-the-water-in-2020/
    I think she could be regarded as a big planing boat?
     
  3. Mr Efficiency
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    Mr Efficiency Senior Member

    It becomes a bit academic as to whether the boats are strictly "planing" boats, whilst boat weight increases as a cube of dimensions, roughly, dynamic lift falls far behind that. It gets to the point that they are not rising much at all.
     
  4. jehardiman
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    jehardiman Senior Member

    I agree, it really depends of how you define "planing". If just lifting the CG, then TICONDEROGA class CG's plane, and DD's, TB's, and PC's have been doing that since TURBINIA. If planing means that most of the hull weight is supported by dynamic effects, then you open the door to all the SES's and PH's. One thing I did notice was the fastest yachts (65-70 knt) listed in bajansailor's post have 2 to 3 times the installed HP as the same sized military patrol craft (35-40 knt) from the 1980's and 90's.
     
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  5. Squidly-Diddly
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    Squidly-Diddly Senior Member

    I was kinda noticing the "2 to 3 times" myself and seems to relate to planing VS semi-planing. But I've heard that true planing is more efficient that semi-planing which is supposed to be least efficient, but I guess the extra 20-30knts on the top end is the real issue. No market for warships with more or less conventional mono-hulls that are "all speed" without the need for lots of "free" interior volume like a big fancy yacht? No sea going parallel to high power aircraft that are just engines, weapons and fuel?
     
  6. Mr Efficiency
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    Mr Efficiency Senior Member

    It is really more a case of the distribution of buoyancy along the boat, being suited to getting a boat beyond "hull speed", rather than depending on a "planing" action, when you are talking large, heavy boats, that don't have a squillion HP on tap.
     
  7. Squidly-Diddly
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    Squidly-Diddly Senior Member

    any general SCALABLE formulas of power, size, weight, PLANING SURFACE AREA for larger planing hulls going up to 'unlimited' size given Earth's gravity and water etc, and typical Vee or shallow Vee hull, or semi-displacement fairly high speed hull like old German E-boat?

    I'd think there would be Spread Sheet with general hull shape, size, weight, power, rough water ability etc going up to at least 60knts and 1000tns made back in the 1950s by USN or RN and now public. Or some late stage mad scientist stuff from the 3rd Reich, lol.
     
  8. jehardiman
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    jehardiman Senior Member

    Yes, there are some military things that are scaleable to that size and speed, but there is always the real issue of a "crash and burn". If you have seen the personnel injury/damage reports when a PHM hits a wave crest or even a BB runs up a sandbar at 20 knts, you will understand why above 30 knts everyone is strapped in.
     
  9. mudsailor
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    mudsailor Junior Member

    Destriero?
     
  10. Mr Efficiency
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    Mr Efficiency Senior Member

    Sounds like a movie title ? :)
     
  11. jehardiman
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    jehardiman Senior Member

    A cheap shot to attempt to claim the Blue Riband from SS UNITED STATES.
     
  12. Olav
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    Olav naval architect

    Squidly-Diddly,

    there are some empirical formulae delevoped/regressed by DLBA to determine the preliminary main particulars of (planing) hulls; please see attached paper for details.

    Hope this helps.
     

    Attached Files:

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  13. brendan gardam
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    brendan gardam Senior Member

    so how do you describe a nuclear sub doing 30 knts under water. its past hull speed so its not displacement. it is under water so it is not planing.
     
  14. Mr Efficiency
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    Mr Efficiency Senior Member

    No waves under water, and it is wave-making that creates a resistance hump. There is heaps of frictional drag, but enough power will overcome that.
     

  15. brendan gardam
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    brendan gardam Senior Member

    so what do we call the movement of a sub underwater. it must still make waves as it moves. or would they be called pressure waves.
     
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