Posts: 3504
Location: Elk River, Minnesota | Hiya,
If you are going from a 3 blade to a 4 blade in the same pitch, you would see a reduction in RPM's of some sort and a loss in top end speed. The reason for this is the extra blade. With one extra blade in the water, you are increasing the amount of surface area for your prop to grab water, thus it takes more for the motor to turn the prop.
On the other hand, going to a 4 blade will increase the handling characteristics of the boat. You could make harder turns in either direction, and the prop will continue to grab water well. It very well may increase your bow lift a touch too, so you might have to play with your trim rod settings. If you are lucky, you will get to move the trim rod away from the boat.
Steve |
