As we looked at last year, French startup BlueNav has developed a rather particular kind of hubless marine e-drive with a propeller inspired by whale flippers. But while the company specializes in ...

Most famous of these is probably the toroidal propeller that made waves a while ago, mostly in the field of flying drones, but commercial toroidal boat props exist too. Test results of the ...

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 ...