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Bill Gibbs

Member Since 03 Jan 2004
Offline Last Active Sep 19 2014 09:59 PM
*****

Posts I've Made

In Topic: Sailing a tri very fast on a close reach. Crew is holding the jib shee

01 September 2014 - 09:16 PM

Point of sail is determined by TWA, beam reach at 90.
We sail at/in AWA, which will be forward of TWA, until we slow, then it will move towards TWA
AWS>TWS sailing hotter than a beam reach, and AWS<TWS sailing deeper, until we slow then it moves towards TWS.
Sails all pull on the mast, which depresses bows, depending on the thrust vector angle which clocks from lateral to forward as we sail deeper. More lateral depresses leeward bow most by depressing entire hull/AMA. More rear depresses both bows when sailing off the wind, leeward most.
So having only the leeward bow depressing and sailing with jib, suggests you are not sailing deep, and easing the big main will have the best fastest effect. It is producing the majority of your thrust, and some of it high.

IMHO

In Topic: Tri-Point Ocean Race

20 August 2014 - 03:01 AM

Fun seeing our little cousins out on the water.

Pre-start at least :-)


In Topic: PHRF vs. Portsmouth

17 August 2014 - 05:44 AM

You have pinged the source of my comment.

Whenever someone complains about their ORCA rating, I respond with "it must be correct, I used Math"

:rolleyes:


In Topic: PHRF vs. Portsmouth

15 August 2014 - 12:45 AM

TOD predicts the time for a boat to sail a mile, regardless of wind strength. Has some merit when displacement monos are all sailing at their hull speed.
TOT assumes all boats sail twice as fast in twice as much wind, on all points of sail (TWAs). Better for multis and uldbs then for displacement boats
It not hard to see that the actual conditions will favor someone, regardless.
A conversion has to assume a single TWS, an average TWA, sea state, etc.
More math doesn't improve the "accuracy".

In Topic: what anarchist is it?

13 August 2014 - 08:10 PM

Yrp. Bills new ride

 

Bill's new ride- Afterburner is for sale.

really! I guess he's slowing down in his dotage... or can't keep up with the west coast multi arms race :ph34r:

Both actually.