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Manifold Pressure vs. RPM: What’s the Difference?

Pilot Institute

The pitch lever (blue lever) adjusts the propeller blade angle to control RPM. Fixed Pitch Propeller With these propellers, the blade angle remains constant and cannot be adjusted during flight. RPM shows how fast the engines crankshaft and propeller spin. Increase the throttle, and both the MP and RPM rise.

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The Smith Family de Havilland Mosquito and its link to RAF East Fortune

Vintage Aviation News

The name “Hydromatic” was a Hamilton Standard patented product name, which described the method by which the blade angle was altered. The forward and aft movement of this through a moving cam changed the blade angles through serrations at the butt of each blade.