My original prop from a used boat was 11 3/4 x 19. Always thought it was under propped. I was trying to decide between a 12 3/4 x 21 and a 13 x 19. After reading posts here and researching online I decided to try the 13 x 19 today. I expected the rpms to go down and maybe see a performance boost because of having more prop in the water. I think the boat actually ran a little worse. I was running at 4200 doing between 25 and 30mph depending on conditions. The new prop I was running 4500 and barely breaking 20mph. I decided to take it back and get the 12 3/4 x 21. I'm real glad I did. It was night and day. I don't feel like I lost any hole shot and at 4200 I was doing 35mph. I was concerned about lugging my motor changing the prop so much. I didn't quite reach WOT. I stopped at 5200 but I only had a little more throttle. I was also by myself and I usually fish with 2 to 3 people on the boat so with the additional weight I believe I'm probably right on.
Thanks for your advice and help,
Tom
Thanks for your advice and help,
Tom