Proa sketches in Rhino
safety ama musings, Mar 24, 2014
Ellipse solid strecthed using control points.
Uses a distorted 3D ellipsoid for the connecting "space" between the big hull and the safety ama, which has the same bottom cross section as the main hull but only 50% of its length, and with a spoon bow shape.
A lot of refinement still needed - cockpit area to windward, larger crossbeams, higher bows with more spring in the sheer of leeward hull(s), merge leeward surfaces of cabin to shed wind and water at same angle, central raised roof height and shape, etc., etc.
Winter Solstice, December, 2015
Grasshopper Salon/Coach, July, 2015
Leeward Salon, Single Entrance, August 27, 2014
Coach Dimensions... August, 2014
Grasshopper hulls, Apr 16, 2014
interior - below beam... Apr 5, 2014
wide coach roof... Mar 31, 2014
coach/pilot roof shapes... Mar 26, 2014
Model Notes history...
These sketches of a 70' Pacific proa were done in the process of learning Rhino CAD. Nothing is final. The basic parameters of the vessel were defined decades ago, the "saftey ama" to leeward is new, and there is still a lot of room for style (like cars!).
This safety ama is one foot off the water at rest, is engaged at 10 degrees heel and gets max. displacement (55% of total) at 20 degrees heel angle. At this size, that extra volume is useful for accommodations.