The toroidal boat propeller pair installed. (Credit: rctestflight) As boring as propeller designs may seem to the average person, occasionally there’s a bit of a dust-up in the media about a ...

Even though the prop had many advantages over the paddle wheel, the fact that during the 1840s and 50s most ships were still made of wood posed significant challenges in terms of power, thrust ...

A few patents later, Sharrow had what he claims is the first major design change for propellers since the 1830s. [Image: Sharrow Marine] The new contra-rotating version.