Overpowered tight(ish) reach, Kite down. As you can see from the short plot, headings were not constant for long as it was gusty and shifty F5-7. Sea state was "Grafham chop" at about a foot or so - Short square waves that eat you if you are not carefull. Off out for a sail soon, so I'll see what I can do. Agree that 10 seconds is a good basis for "Agreed speed" for any want of a better word.