Wow, that's impressive, Al,*if I do*say so*myself.* With FlyWright going in the opposite direction, it looks like I'm going nearly 20 knots.
Skipperdude, tidal currents are constantly changing here and I have no speedometer.* But GPS shows speed over bottom/ground.* The Coot can't go faster than hull speed, but I've measured the increased speed once resulting from raising the sails: an increase of 0.6 knots and near*elimination of rocking with a beam sea and wind of about 10 knots.* Engine is a normally-aspirated John Deere 80 h.p. diesel.
The Coot is pushing a pretty good bow wave, so probably wasn't going far from hull speed in the picture.