How does a variable pitch propeller work on a boat?
By varying the propeller blades to the optimal pitch, higher efficiency can be obtained, thus saving fuel. A vessel with a VPP can accelerate faster from a standstill and can decelerate much more effectively, making stopping quicker and safer.
How does a controllable pitch marine propeller work?
A controllable-pitch propeller is made up of a boss with separate blades mounted into it. An internal mechanism enables the blades to be moved simultaneously through an arc to change the pitch angle and therefore the pitch. The cylinder movement is transferred by a crank pin and ring to the propeller blades.
How do adjustable pitch propellers work?
A variable pitch propeller is one in which the pilot is able to adjust the blade pitch during flight. The blade angle can thus be adjusted to its optimum value for the phase of flight, be it takeoff, climb or cruise. For a variable pitch propeller, the pilot controls the blade pitch with the propeller control.
How does the Autoprop work?
Autoprop automatically varies its pitch depending on the conditions. The less pressure the Autoprop feels on its blades the more pitch is applied and vice versa. The result is maximum efficiency whatever the conditions, with increased speeds at lower engine revs and lower fuel consumption and emissions.
What is the difference between a fixed and variable pitch propeller?
On a fixed pitch prop, the angle of the blade is set to one pitch only. So for every revolution of the prop, the prop will be able to move only a that set distance. On a variable pitched prop, the angle of the blade is adjustable and it can vary the distance traveled for each revolution.
What is the difference between fixed pitch propeller and controllable-pitch propeller?
Unlike fixed pitch propellers whose only operational variable is rotational speed, the controllable pitch propeller provides an extra degree of freedom in its ability to change blade pitch.
What is an Autoprop?
The Autoprop is an automatically self-pitching feathering propeller that maintains maximum efficiency at all times. It has a higher efficiency over a wider range of RPM settings, producing higher speeds with lower engine RPMs.
How does propeller cavitation take place?
Face propeller cavitation occurs on the driving face of the propeller and is often due to an incorrect pitch distribution along the length of the blade resulting in the tip pitch being too small and the blade sections developing a negative angle of attack. Its results are frequently found on controllable pitch units.