Differant make props with same pitch perform much differant. 90 2 stroke, when new with 13 by 17 yamaha ss prop wot trimed up was 5500-5600. Just bought solas 13 1/4 by 17. Wot, same trim is 4500-4600. A couple mph faster, seems like slower hole shot. Really not the results i was hoping for. Hoping i can get it re- pitched to 16"? Herse hoping. Oh, the solas has approx the same cup as the yamaha, just more aggresive, bigger blades.