It was designed to take a number of different engines and to use two, three or five-bladed propellers.

Soviet equipment used regular treads and either propellers or water jets.

The platform itself is unanchored, instead using propellers to maintain position in choppy seas.

This level introduces propeller guards who use propellers on their head to fly.

Another advantage to using composite propellers is that it is a lightweight material.

A couple were modified to use wooden propellers with a fixed pitch.

Wind speed is measured by anemometers, most commonly using rotating cups or propellers.

A closely related phenomenon called cavitation is a serious problem for boats using high-speed propellers.

Nelson says, "I'd say it was a drive shaft bearing, if we used propellers."

The use of thrust vectoring using ducted fans or propellers.