Well dad built me a new prop "49 Senior" Started with a grim 40x57 detounged , bar cut ' sharpened and balanced. Went from 9grams to 8grams. We put it on the boat with the GPS and it went 46.8 MPH, 2 weeks prior with a 38x55 it went 42.3. 4.5 Mph just with a prop change is awesome for me. I...