Struggled to get any speed today the 41 doesn't seem to work with weed speed fins they just don't provide enough lift for this board and never got the board trimming right in the end I lifted my boom right up and brought the track back which did help get the board to ride better, had a reboxed ka assy speed fin in the car but dreaded walking/crawling through the mud to get it, in the end I run out of steam and called it quits, great to see so many guys flying today.