Yes that was going to weather
. The boards were marked but from memory about 2/3 up , I remember thinking it wasn't much to leave in the water
. But with long narrow hulls (compared to a mono) it really made imperceptible difference to leeway - checked by GPS
The board that broke was fully down going uphill in 35-40kn, pushing hard at the time to get around a nasty corner before dark which was also why I left it down thinking that would help me crawl around a headland. Wouldn't do it again. The boat went airborne out the back of a wave and while in space the high windage meant we were moving significantly sideways by touchdown which I am sure is why the (carbon) board snapped off at the hull
Since all boats are different it would be interesting to experiment
with another, use GPS
to check leeway board down, up and halfway on different days.