Hull with the least wake

Discussion in 'Boat Design' started by silentneko, Jun 21, 2021.

  1. BlueBell
    Joined: May 2017
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    BlueBell "Whatever..."

    An eight-person rowing shell.
     
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  2. clmanges
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    clmanges Senior Member

    Not what I think of as 'recreational' ...

    I've been inspired by the British Two-foot Punt. Also not recreational, but when not being pushed hard, they produce zero bow wave, and just a little turbulence behind. Even the broad touring punts cruise with zero bow wave.
     

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  3. The Q
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    The Q Senior Member

    They've done a fair amount of experimentation on the Norfolk Broads with low wake motorboats to prevent river bank erosion. These boats are effectively floating caravans used by inexperienced tourists, we have a top speed limit of 6 mph..
    The biggest cause was bow wave, the solution most used appears to be a triple bow, so the wave / wake caused by the central main bow wake is "captured" by the side bows, the side bows generally have their outside faces parallel to hull so producing little or no wave to the outside.

    As for the stern a slow gentle rise so the bottom of the hull reaches water level at the stern, difficult when your trying to get maximum volume inside for the tourists..
     
  4. cracked_ribs
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    cracked_ribs Senior Member

    If I'm picturing this correctly, it sounds like it lends weight to the argument that the Hickman hull form would do well at displacement speed. You get a couple of the same features there, with the parallel sides, inwardly directed bow wave, and the rising, flattening stern.
     
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  5. wet feet
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    wet feet Senior Member

    More of a low deadrise hull with sponsons that project vertically down a foot or so and the sponsons run out above the waterline at the bow.The large fillet radius between the main surface and the sponson is supposed to catch the bow wave.Which it does to some extent.It also catches every little ripple when moored and doesn't enhance the chances of a good night's sleep in the island berth commonly used in the bow of these hulls.I imagine the Sea sled would do the same.
     
  6. tlouth7
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    tlouth7 Senior Member

    If a rowing shell is out then I would propose:

    - Sea kayak,
    - Touring canoe
    - Coastal rowing boat

    Basically any design optimised for low speed and extremely low power (i.e. human propulsion).
     
  7. wet feet
    Joined: Nov 2004
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    wet feet Senior Member

    Back in the days when the very clever Leo Lasauskas was posting here frequently,you could download his Michlet program which could generate a very realistic wake pattern.Better yet,there was the Godzilla routine that ran a few iterations of the original shape as it refined a subtly different and more easily propelled variation.It was originally intended for the development of better rowing shells but had an amount of ability with other shapes.I never did get it working on my old XP machine and it seems to have disappeared since those distant times.
     
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  8. silentneko
    Joined: Jan 2014
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    silentneko Junior Member

    Well you guys have brought up some interesting options. I'm not looking to really reinvent the wheel, I was just hoping to look at some starting points before I venture further.

    Let me re-redefine the parameters closer to what I want. What currently available production design, between 20' and 35' LOA and a max of 9' beam, powered possibly by an outboard motor, creates the least amount of wake at displacement speeds?
     
  9. bajansailor
    Joined: Oct 2007
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    bajansailor Marine Surveyor

    How about Richard Woods' 20' Skoota cat?
    Ok, her beam is 12'6", but she folds down to 8' wide for trailering on the road.
    Sailing Catamarans - Skoota 20 trailable with small cuddy https://www.sailingcatamarans.com/index.php/designs-2/6-powercats/262-skoota-20

    Nigel Irens' Rangeboat is a bit bigger at 39' than your 35' limit, but she seems to be pretty efficient -
    Rangeboat - Nigel Irens Design https://nigelirens.com/boats/power-boats/rangeboat/

    Or the Loxo 32 from Pogo Structures in France?
    Loxo 32 - Chantier naval POGO STRUCTURES https://www.pogostructures.com/en/fiche-bateau/loxo-32/

    Or the Duchy 21 from Cockwells in England?
    Cockwells | Duchy Motor Launches | The Duchy 21 | Gentleman’s Yachts For Sale https://cockwells.co.uk/duchy-launches/the-fleet/duchy-21/
     
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  10. kerosene
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    kerosene Senior Member

    it can be still found with bit of googling
     
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