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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