To the Editor of the New-York Times: In your issue of last Sunday I was much surprised to find a communication signed W, advocating the use of the double-propeller or "twin-screw" for our naval ...

Very little is known about one such case – the home-built twin-engine, double propeller ... to bypass its twin and turn the second propeller. The screws consisted of two custom-built four ...

TimesMachine is an exclusive benefit for home delivery and digital subscribers. About the Archive This is a digitized version of an article from The Times’s print archive, before the start of ...

In a paper recently read before the Society of Arts of London, by J. MacGregor, on the paddle wheel and screw propeller, it was observed that in the modes of propulsion employed by aquatic animals ...

The larger swept area of the VSP’s rectangular blade, compared to the circular blade of a screw propeller of the same diameter, produces a higher efficiency compared to other steerable thrusters.