It is in fact a combination of the three elements.

What is the best prop pitch for my boat. Depending on the boats capabilities the speed and the intended use you will have several choices. For example going from a 23-pitch to a 21-pitch propeller will increase engine rpm by about 400 revolutions. The calculator will automatically compute the 5 th variable.

13x17 or 19x23 usually labeled on the propeller. The best bet is compromise between these extremes a prop size that puts the engine in the sweet spot of its RPM range for everyday use. A prop with too much pitch may deliver more top speed because the prop moves further forward with each rotation but acceleration may be poor and the boat will struggle to get on plane.

However boaters who require good low speed performance may prefer fitting a lower pitch prop. A couple ways to estimate this. Remember that each inch of pitch is equivalent to about 200 rpm.

The higher pitch of the propeller the faster your pontoon boat is going to sail. Though a propellers pitch may be 21 inches in the real world multiple factors will prevent it from actually travelling that much with a single rotation. That extra blade really makes a notable difference in getting the boat out of the water and controlling it at higher speeds.

If you have the existing part that is stamped on your boat propeller you can find all matching props here. Ski boats need more top end speed and should choose a prop with a higher pitch. The prop will impact the engines revolutions per minute.

For example I have a boat with a max RPM of 5800 my propeller pitch is 24 and the gear ratio is 192. 1 use the Mercury Prop Slip Calculator or 2 if you know the top speed of your boat enter the RPMs Pitch and Gear Ratio in the Boat Speed Calculator tool and vary the slip value until the estimated speed is correct. Two other design features include Rake and CupThese elements are not labeled on the propeller.