The new SUN FAST 3300 with a double concave line

Discussion in 'Sailboats' started by Dolfiman, Jan 9, 2019.


  1. philSweet
    Joined: May 2008
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    Location: Beaufort, SC and H'ville, NC

    philSweet Senior Member

    I agree with what the others have said. What you see is a hull that is optimized for a fairly high heel angle and designed to generate maximum RM per wetted surface area when heeled at 15 or more degrees. It may not like light airs much if it can't be persuaded to heel, but the crew of a 33 footer can have a pretty big effect on trim, maybe enough to keep it from getting glued in light air.

    "Guppy bellies" have been around for at least 200 years, and have shown up on high end racing boats like 12 meter and J boats, as well as on the most prosaic of sailboats, the New Haven sharpies. The two boats Ralph Monroe built after Presto, at 41 and 42 feet, both had pronounced guppy bellies, both in order to hold more internal ballast and to improve the form stability when heeled (the original Presto was kind of a dog, but the latter two worked quite well). Unlike the Skerries mentioned earlier, these boats use a very full midsection shape to generate RM through high form stability. The Skerries were renowned ghosters, and went with low form stability shapes that led to vee-shaped midsections and narrow sterns. They are at the very opposite of the spectrum in terms of optimization goals.
     
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