Posts: 3508
Location: Elk River, Minnesota | Hiya!!
Giving that both props are of the same design and made up of the same material, going up in pitch will reduce your RPM's by anywhere from 300 to 400 depending on the prop and the power of the motor. A rough estimate when doing a prop change is to consider somewhere around 200 RPM's per inch of pitch change. So...go down in pitch, rpms go up.
Many times what can happen if you go up too high in pitch is you will find you cannot trim your boat well along with not getting up to the desired RPM level. The boat will porpoise because there is not enough power to hold up the bow, so it rises and falls accordingly. The other thing that can happen is an increase in prop slip on turns, which is a loss in handling. The biggest change you will find in going up in pitch will be a loss in hole shot....the boat will take longer to get up on plane than what it would be with a lower pitch prop.
Going up in diameter will reduce your RPM's even more, roughly being 100 RPM's per 1/4 inch and vice versa. The larger diameter usually gives better handling and less slip due to a larger blade surface area.
Steve |
