My thoughts are that I would like some sort of v at the bow to reduce slap as I want to have a more extreme prismatic coefficient and a pronounced reverse stem.I also have played with going hardchine for the last three feet to handle the complex part of the bows Flat bottom with 6" radius for the rest seems quite OKas i don't see much flying of ww hull. I was tossing up between a 12:1 ratio for better light wind giving about 2'9" for 33'er at the waterline or going for 2'waterline with spray deflectors giving a flare above the waterline to give a shade over 3' wide at sitting height for the the middle half of the hull. Farrier reckons his tris go just as well or even better with a faatter middle hull. I am working omn 2 tonnes max displacement for the ww hull-
DOn't see much difference in ease of build. If you are going to single glass the whole bottom and sides in one go the semicircle would be prety easy, htough you would find it tending to a parobola if unconstrained. If you are doing one half at a time, then the the join can be double sided if you go for the flat bottom.
-- In harryproa@yahoogrou
>
> Hi,
>
> I have questions on the "best" cross section for the ww hull in a
> harryproa of around the harry size (25-30' ww hull).
>
> I have been intending to use a flat bottom, which would reduce the
> above waterline height while still giving standing headroom. I figured
> a 10' flat section, with the hull curving up over a 4-6" radius would
> give enough flat space to walk. I think the hull needs to widen out to
> at least 2' beam above the waterline to make it comfortable to walk
> around in.
>
> The downsides of the flat bottom are possible slapping it short waves,
> a wider than minmal waterline beam (it will be close to 24' wide at
> the waterline; maybe 22", assuming a draft of 8" or so), and some
> complication getting the hull to bend uniformly when making it.
>
> What do the people on the group think is the "best" cross section to
> use for both simplicity of construction and performance (min beam and
> wetted surface) ?
>
> Would I be better off with just a 12" radius semicircular keel and
> vertical sides? It would be the simplest build and the min wetted
> surface for a 12" draft, but it probably would not draw that much.
> Displacement on a 12" radius for a 26' boat with a 0.75 prismatic
> coefficient would be 1960 lbs.
>
> Thanks for your thoughts!
>
> - Gardner
>
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