I tried the Quick Silver 15 P prop out at Sekiu and was not impressed with the performance. I was only getting above 20 mph on the down hill side of swells. The motor got up to 5800 rpm, but speed varied between 18-20 under normal flat conditions. I took it back to the Prop Shop and tried a 17P yesterday. I was very happy with the speed increase. WOT, 5200 rpm, I got 28mph. 4500 rpm I was getting a comfortable 20 mph. Thanks for the input.