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

By changing propeller pitch. On many aircraft blade angle can be manipulated similarly to the throttle in order to affect the thrust produced and the load on the engine.