In what way can a variable pitch propeller be adjusted?

A variable pitch propeller can indeed be adjusted while in flight. This capability allows pilots to optimize the propeller blade angle based on the aerodynamic needs of the aircraft at various flight phases. Adjusting the pitch during operation can improve efficiency, performance, and engine power management, especially during different stages such as climbing, cruising, or descending.

In contrast, adjusting the propeller only on the ground would limit the performance capabilities of the aircraft since it would not respond to changing flight conditions. Adjustments solely during takeoff would similarly restrict operations and would not utilize the full advantages of variable pitch technology. Additionally, while manufacturers set the initial design and operational parameters, it is typically the pilot or flight crew who adjust the propeller pitch based on real-time requirements. Thus, the ability to adjust the pitch while in flight is a significant feature of variable pitch propellers, enhancing the aircraft's operational flexibility.