Fixed-pitch propellers are usually designed for maximum efficiency at…
Refer to figure.
A fixed-pitch propeller is designed to be efficient only when flying at a small range of speeds. Usually, this corresponds to the cruising speed as the airplane is spending more time during the cruise than any other flight phase. Therefore, your piston engine fitted with a fixed-pitch propeller will have increasingly better performance as airspeed is building up after take-off. On the other hand, variable pitch propellers are designed to operate at a constant RPM and be efficient over a wide range of speeds. You can see the speed vs. efficiency graph for different pitch settings in the attached figure.
A fixed-pitch propeller is designed to be efficient only when flying at a small range of speeds. Usually, this corresponds to the cruising speed as the airplane is spending more time during the cruise than any other flight phase. Therefore, your piston engine fitted with a fixed-pitch propeller will have increasingly better performance as airspeed is building up after take-off. On the other hand, variable pitch propellers are designed to operate at a constant RPM and be efficient over a wide range of speeds. You can see the speed vs. efficiency graph for different pitch settings in the attached figure.
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