How does increasing the horsepower/torque to a piston engine in an airplane increase top speed if the propeller size and rpm stay the same?

Question

How does increasing the horsepower/torque to a piston engine in an airplane increase top speed if the propeller size and rpm stay the same?

In: 16

Answer 1

Increasing the prop pitch is one way for sure. Increased power can help the engine tackle more potent prop angles and throw more air back per revolution.