Propeller

Moving an EP-3E Orion's number four engine as part of pre-flight checks

A propeller makes an aircraft, ship, or submarine in water or air go by making a big wind or a strong stream. It does this by turning two or more wings very quick. The blades of a propeller act as rotating wings, and produce force through application of both Bernoulli's principle and Newton's third law, generating a difference in pressure between the forward and rear surfaces of the airfoil-shaped blades.

Propeller Media

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  A 'right-handed' propeller on a merchant vessel, which rotates clockwise to propel the ship forward

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  Propeller of Pratt & Whitney Canada PW100 turboprop mounted on Bombardier Q400

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  Archimedes' screw. Public domain, from Chambers's Encyclopedia (Philadelphia: J. B. Lippincott Company, 1875). Added to illustrate article en:Archimedes.

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  Screw propeller of SS Archimedes

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  A replica of SS Great Britain's first propeller. A four-bladed model replaced the original in 1845. The ship was originally designed to have paddles, but plans changed after screw propellers were shown to be much more efficient.

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  ATR 72 propeller in flight

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  Propellers of RMS Olympic. The outer two are counter-rotating.

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  Cavitating propeller in water tunnel experiment

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  Cavitation damage evident on the impeller of a personal watercraft

Other websites

• Aircraft-Info.net - Propeller Aircraft Archived 2006-11-05 at the Wayback Machine
• Titanic's Propellers