On 9/12/2015 1:04 PM, Wayne.B wrote:


Heading 150°T, with a resulting COG of 140°T, we were on a beam reach - the
fastest point of sail - and thrilled with our progress. Depending on which
of our speed indicators you believe, we were making 9.8-12.0 knots STW.
Approaching the edge of the Gulf stream meant we had a slight current
against us, but we still averaged more than 7 knots SOG, despite an apparent
wind of under 10 knots.


oops. My previous message which I tried to recall was wrong. The formula
for hull speed is (sqrt Lwl)*1.34 yielding a hull speed for you of about
8.5 kts. I still think either 9.8 kts much less 12 kts unrealistic and
both demand a calibration, but the embarrassment is mine.

-paul


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