On Mon, 14 Sep 2015 05:37:09 -0600, Paul Cassel
wrote:

On 9/13/2015 9:47 AM, Wayne.B wrote:
On Sat, 12 Sep 2015 14:24:12 -0600, Paul Cassel

===

I'm guessing that he might have been quoting SOG from a GPS and
getting some boost from the Gulf Stream. My old Cal-34 used to exceed
hull speed under sail fairly frequently however. It's not an absolute
limit, just a point where you need a lot more power to start climbing
the bow wave.


I doubt it. If he were headed north, then yes, but the Stream runs
roughly 90 degrees to the intended course here. I can't see how that can
add to speed made good. Maybe Skip will drop in and clarify.


===

It's basically simple vector algebra. Assume a speed through the
water of 5 kts on a course of due east. Also assume a north flowing
current of 5 kts. The resultant course made good would be north east
at 7 kts.