For the most part, very little. They have recently entered into an agreement with Yamaha outboards[1] to have Yamaha manufacture Sharrow propellers. So far tho

For the most part, very little. They have recently entered into an agreement with Yamaha outboards[1] to have Yamaha manufacture Sharrow propellers. So far though there has not been much in terms of real-world validation of the props on common boats. In some cases there are modest gains seen (<10%), but that is not enough to offset the increased upfront price of the Sharrow. If they could get the manufacturing cost down to that of a typical high performance propeller it might have more demand in the market. [1]https://boattest.com/article/yamaha-cast-and-sell-sharrow-propellers https://boattest.com/article/yamaha-cast-and-sell-sharrow-pr...