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

Ericsson was the inventor of the propeller, and told a curious story about his first propeller boat, and a Commission of the British Admiralty. Mr. Raymond obtained his extraordinary information ...

In a bubble test, air is blown in front of the spinning propeller to visualize the flow of the water. This revealed some stalling on the bi-blade and the toroidal design too, which would explain ...