Airplanes obviously employ very different engine technology compared to ground vehicles, but some actually do use a form of ...

Then I look at the tip-speed, and extend the diameter of the propeller as far as I can, so that at maximum rpm, the propeller is not going above 850 feet per second on the tip-speed. At about 800 ...

Traditional Gori propellers fold automatically when the engine is off to reduce drag, but they were not optimized to spin freely and generate electricity. The Hybrid Propeller solves this problem ...

Car engines run at higher revolutions per minute than aircraft engines; adding the unit slows rpm so the propeller operates ... (and an hour reserve) at a speed of 130 mph, and room to carry ...