Does more pitch mean less or more rpm.?

Answer 1

The pitch of a propeller is a measurement of how far it moves through the water in a single rotation. On small craft it will generally be measured in inches, while on ships it is measured in feet (in the USA).

More pitch means that the boat will move a greater distance with every turn of the propeller. The diameter of the propeller also comes into play, but for propellers of the same diameter more pitch requires more horsepower to turn. For best performance on small craft it is important to match the propeller pitch and diameter to the engine and hull design.

To answer your question less pitch of the same diameter propeller will mean you can turn it at a higher RPM.

Answer 2

Nobody really explained how pitch works.

Say your propeller is 17 x 19

This means your propeller's diameter is 17" and for every rotation, your boat will hypothetically move 19".

So if you increase pitch to say, 21 inches, you will be making the engine work harder, therefore have less RPM's

Typically each inch of difference in Pitch will change your RPM by 300.

Check out this link for more info
Thanks!

Answer 3

No. Increasing the pitch will increase the speed, and require more power. You can keep an even rpm and increase or decrease speed by changing the pitch. Greater pitch requires more power.

Answer 4

Above are correct. To make more simple;
The lower the number (i.e. 19 pitch) the higher the R.P.M. (Boat has more power, less speed).
The higher the number (i.e. 21 pitch) the lower the R.P.M. (Boat has more speed, less power).

For more; To Ski or Inner Tube you need Power. To Cruise around and just ride, you may want speed. My boat is 165 Horse Power Inboard Outboard, I use a 21 pitch prop and it Ski and Tube well and still go about 45 m.p.h., if I go with a higher pitch it may go about 50-55 m.p.h. but, it slow going pulling up a skier or getting a Tube going.

The link can explain better and has pictures. ;-)

Answer 5

more pitch means the prop is taking a bigger bite out of the water, so the engine has to work harder and will not be able to make as many RPMs

Answer 6

if you are talking about controllable pitch ,it will increase the load on the engine which would eventually decrease the r.p.m.,think of this way the more pitch the further the prop will travel with every rotation.