I spent a long time playing with the sharpie/box keel concept, all in the belief I was keeping construction simple.  in detailing, it finally dawned on me that something like this would actually be a more efficient use of time and material and easier to layout.

I also realized that Bolger style hulls count on some heel to get the full waterline, something a proa doesn’t do much of unless you’re flying the AMA.

I’m thinking this might get built next year, at least in a 16ft test bed.  Split junk rig far enough to windward to balance well with both rudders immersed all the time and interlocked, seating position for helmsman similar to Skips bionic broomstick.

more detail to come as I waste time between sales calls in Idesign on the IPad

Box section hulls make sense with a Bolger sharpie and also for super fast catamarans that don’t care about interior accommodations. This kind of flared hull will give useful interior volume, a narrow waterline AND be about as simple to build as any boat has a right to be.

Editor - 28 November 2012 06:39 PM

This kind of flared hull will give useful interior volume, a narrow waterline AND be about as simple to build as any boat has a right to be.

Amen (from the choir) 😉

Skip

The classic Sharpie style hull is a very good hull-shape. I don´t agree that it is simpler to build than a box-section Bolger AS-sharpie hull, but it has much more usable space in hulls under 40 feet or so. In a large proa the space near the chines become very useful as storage.

Gary Dierkings Wa´apa looks very much like a sharpie-hull. A very nice looking proa!
Wa´apa

Cheers
Johannes

Johannes,

I agree with you until I start putting my bulges on the sides above the water line to get the inside accommodation on the smaller sizes.  At that point I go from 4 to 8 longitudinal seams that need to be cut/glued, not to mention be layed out.  I also have the critical design decision to make of how close to the waterline do I bring them?  Inside space vs wave slap and heel angle where the leeward starts to be a pod and add stability.

This is just SIMPLE.  It also accommodates the @48” height on a 24’ hull in a way I had a hard time making at all pretty the other way.

If I ended up doing a boat 32’ or bigger I could very well end up back at the Bolger hull form.  That’s where the bottom is finally wide enough for good accommodation over most of the boat length.

Tom