So if slip and efficiency are "proportional", then there ought to be a "rule of thumb" or some other means of calculating one from the other. I am sure that each boat would need some sort of "constant" to be determined that would account for factors like wetted surface, underwater profile, shaft angle and offset, keel profile, etc. I can't help but picture some sort of "handicap" system, based on penalties for hull design characteristics, similar to PHRF giving-to/taking-from seconds per mile over a base handicap value for a boat for modifications to sail plan, rig, keep, prop, etc. The base handicap for each boat could be calculated, and then fudge-factors added/subtracted based on peculiarities of each boat.
Sorry for rambling, I'm the handicapper at my yacht club and we have our first racing committee meeting tomorrow so my brain is awash in PHRF formulae at the moment.
/Jason
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Posted by: jt.yahoo@jtaylor.ca
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