Propeller
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A propeller is a type of propulsor with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which exerts linear thrust upon a working fluid such as water or air when r
A 'right-handed' propeller on a merchant vessel, which rotates clockwise to propel the ship forward. The man's hand rests on the trailing edge.
Propeller of Pratt & Whitney Canada PW100 turboprop mounted on Bombardier Q400
Archimedes' screw
Smith's original 1836 patent for a screw propeller of two full turns. He would later revise the patent, reducing the length to one turn.
Paddle steamer
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A paddle steamer is a steamship or steamboat powered by a steam engine driving paddle wheels to propel the craft through the water. Earlier ships that are driven by a paddle wheel under manual power a
Propeller
…including Surveyor of the Navy Sir William Symonds. In spite of the boat's achieving a speed of 10 miles an hour, comparable with that of existing paddle steamers, Symonds and his entourage were unimpressed. The Admiralty maintained that screw propulsion would be ineffective in ocean-going service, while Symonds…
A typical river paddle steamer from the 1850s.
Advance, a Greenock-built American Civil War blockade-running sidewheel steamer
Left: riveted steel paddle wheel from a sidewheel steamer on Lake Lucerne Right: a sidewheel concealed within the hull of a steamer
The Nettie Quill, pictured in Alabama in 1906, shows a typical early sternwheeler design.