Originally Posted by irbracer
cheers for the feed back!
we run stock 25hp tohatsu within the slsa guidelines and rules, and four blade props ranging between 9.0 and 9.9, of which we are wanting to get worked to get the best out of, is there and small aspects such as how much cupping or little of there should be?
9 to 9.9 pitch? that's going to seriously limit your top speed. My mate's got a Ceasar Surfcat with a Tohatsu 30 running and the 13p prop wasn't enough. He's now running a 10x15 Ron Hill chopper, but it could easily spin more.
If you haven't already get a tach (tinytach are good) and an accurate GPS to measure your speed, these will help massively when tuning props.