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post #24 of Old 07-22-2017
TakeFive
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Re: LOA vs LWL, looking for a boat

Quote:
Originally Posted by Jeff_H View Post
There is a good reason that you never thought of it that way. There is no reason to think that a boat that has a long waterline relative to it's length on deck would be "sticky" in light air. A particular design might be sticky in light air but not because it has short overhangs.

In the case of the First 260 it has an SA/D of 19.9, and it takes an SA/D in the mid 20's to get decent Light air performance. It also dragging two rudders through the water, one always slightly cocked so as to create drag but little steering.

Light air performance is all about sail area to wetted surface, and to a lesser extent sail area to displacement.

Wetted surface is all about the shape of the boat in the water, and it doesn't care whether there are long or short overhangs in flat water. In a chop, a boat with long overhangs tends to pitch more, and so if equally shaped below the waterline the boat with short overhangs should be less sticky.

Jeff
You might want to reread his post and reconstruct your statement. He said:
Quote:
Originally Posted by jackdaw View Post
...High LOA/LWL ratio boats are often sticky in light airs...
Boats with high LOA/LWL ratios have longer overhangs, not short ones, and they thus have a shorter waterline relative to length on deck, not a longer one.

Although it's confusing, I think his statement agreed with you overall, though perhaps with different assumptions about sailing conditions.

Rick S., Swarthmore, PA
USCG Certified Captain, OUPV and 50 Ton Master
ASA Certified 101/103/104/105/106



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2001 Catalina 34MkII Tall Rig Wing Keel Breakin' Away, Universal Diesel M35B, Mantus 35 lb. anchor, sailing out of Rock Hall Landing Marina
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