Both. The advantage of pitch propeller is to keep the speed constant and change the thrust by adjusting the pitch, which is suitable for direct drive of diesel engine. If it is driven by a motor, you can change the thrust by adjusting the speed with a frequency converter, so there is no need to adjust the pitch. Full-rotary high-power propeller is generally a fixed-pitch propeller, which is related to the ship type suitable for full-rotary.