@Larsb I’m using an 8’ paddle board, initially I tried a smaller board that wouldn’t work with the amount of power I have. A Gong Allvator Rise M70, 80cm mast, and an old 1950’s 2- blade 9-spline shaft propeller 7"x4 3/4" pitch that I found on eBay. I cut it down down to 6" (150mm) diameter. The motor came with the 7.5"x7" BA prop that I modified several times with no success. I have several videos with VESC data on my build thread if anyone is interested.