IMOCA 60 2022

Discussion in 'Sailboats' started by philSweet, May 12, 2022.

  1. wet feet
    Joined: Nov 2004
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    Location: East Anglia,England

    wet feet Senior Member

    Some interesting ideas,obviously removing longitudinal slice of the hull to reduce beam would remove a portion of the hull weight.Equally clear is the potential for longer foils.My question would be what the effect on righting moment would be as both the ballast keel and the water ballast tanks would be less far to windward.I do wonder if the very efficient hull structures can be optimised much further,given the ballast that is inherent in the boats.They seem to be heading in the same direction as the 12 metres of the last years of the America's Cup era,when the light hulls were hauling round a lot of ballast but with a foiling boat that ballast needs to be optimally located.

    I have been wondering if the next performance step will come from improving the working environment for the sailors.There seemed to be a perceptible difference in the behaviour and happiness of the sailors in the Ocean Race and the TJV if they had a light and airy place to perform.Some of the others appeared to resemble working in a coal mine,with all that carbon on show and not coated-to save weight presumably.The layout of Malizia in particular might be a signpost to the path ahead,perhaps not with quite as much freeboard and maybe a coachroof like that of Paprec Arkea for better streamlining.Still an fascinating class of which to observe the progress.
     

  2. myszek
    Joined: Jan 2013
    Posts: 97
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    Location: Lodz, Poland

    myszek Junior Member

    Thanks for the response.
    My narrow hull was just a side effect of the deep-V stern, intended to improve the longitudinal balance. For me, the longitudinal instability is the basic flaw of the taildragger layout, and the strongest limitation of the use of foils.
    I wonder, what fraction of the total weight are you expecting to be carried by the foils in your design. Could it be more than 50%?

    What concerns the static stability, I agrre that there is always a risk of loosing the lift of the foil, or even getting a negative lift due to the unfortunate wave pattern. Then, only the static stability prevents the knock-down. In my crazy design, the static righting moment at a reasonable (20deg) heel with fully canted keel is about 2.5-fold lower than the maximum dynamic righting moment. I estimate, that for an IMOCA boat with a usual hull width this proportion is closer to 1:2. Is this a significant difference? I am not sure. Anyway, in both types of boats, the foiling mode and the displacement mode of sailing are much different from one another.

    It is deliberated not to use all the available sail area in my design. As an enthusiast of proas, I grew up with the "downspiraling" paradigm: instead of increasing the power, righting moment and weight, reduce the drag, weight and power. This approach is not obvious for displacement boats, but becomes natural for foilers. I wish I could have a much shorter mast...

    What I can be sure, is that nobody will dare to build the boat following my idea ;)

    regards

    krzys

    ps. my even more crazy, ultimate Mini foiler is under construction, close to finish
     
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