For instance, if the propeller cover 100 millimeters per turn through a solid, then its pitch is 100 millimeters. Their astern maneuverability is poor. Feathering propellers, in particular, are a special controllable pitch propeller type, ensuring low drag, because of their characteristic blade design. Controllable pitch propellers are very practical because by modifying the pitch they allow for thrust optimization under different load conditions. Most modern sailboats are fitted with this type of propeller.
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On the other hand someone believes that one should keep the pitch as long as possible in order to achieve the cruse speed at lower as possible rpm. For example, lets suppose that a 6 knots cruise speed is reached at 2800 rpm. This is due to the higher stress concentration on the engine pistons, crankshaft and bearings, which can lead to some serious damage such as engine seizing. The propeller will turn faster, thus increasing shaft and bearings vibrations. In my experience, the ideal solution is an average of the two and can be obtained with practical tests.