Propeller
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
A 'right-handed' propeller on a merchant vessel, which rotates clockwise to propel the ship forward
Propeller of Pratt & Whitney Canada PW100 turboprop mounted on Bombardier Q400
Archimedes' screw. Public domain, from Chambers's Encyclopedia (Philadelphia: J. B. Lippincott Company, 1875). Added to illustrate article en:Archimedes.
Screw propeller of SS Archimedes
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.
ATR 72 propeller in flight
Propellers of RMS Olympic. The outer two are counter-rotating.
Cavitating propeller in water tunnel experiment
Cavitation damage evident on the impeller of a personal watercraft
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Other websites
- Aircraft-Info.net - Propeller Aircraft Archived 2006-11-05 at the Wayback Machine
- Titanic's Propellers