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What (who) is reverse propeller - definition
![TP400]] turboprop of an [[Airbus A400M]]](https://commons.wikimedia.org/wiki/Special:FilePath/Airbus A400M EC-404 ILA 2012 11 (cropped2).jpg?width=200 "TP400]] turboprop of an [[Airbus A400M]]")
![[[Leonardo's aerial screw]]](https://commons.wikimedia.org/wiki/Special:FilePath/Leonardo da Vinci helicopter.jpg?width=200 "[[Leonardo's aerial screw]]")
![Prototype created by [[Mikhail Lomonosov]], 1754](https://commons.wikimedia.org/wiki/Special:FilePath/Lomonocov s Aerodynamic Machine 01.jpg?width=200 "Prototype created by [[Mikhail Lomonosov]], 1754")
![A 6-bladed [[Hamilton Standard]] 568F propeller on an [[ATR 72]] short-haul airliner](https://commons.wikimedia.org/wiki/Special:FilePath/Precision air ATR72 5423a.gif?width=200 "A 6-bladed [[Hamilton Standard]] 568F propeller on an [[ATR 72]] short-haul airliner")
![Cut-away view of a [[Hamilton Standard]] propeller. This type of constant-speed propeller was used on many American fighters, bombers and transport aircraft of [[World War II]]](https://commons.wikimedia.org/wiki/Special:FilePath/Propeller diagram.jpg?width=200 "Cut-away view of a [[Hamilton Standard]] propeller. This type of constant-speed propeller was used on many American fighters, bombers and transport aircraft of [[World War II]]")
![A decorated Japanese ''taketombo'' [[bamboo-copter]]](https://commons.wikimedia.org/wiki/Special:FilePath/Taketombo.JPG?width=200 "A decorated Japanese ''taketombo'' [[bamboo-copter]]")
![A sailor checks the propeller of a [[Landing Craft Air Cushion]] hovercraft](https://commons.wikimedia.org/wiki/Special:FilePath/US Navy 060817-N-1467R-042 A Sailor assigned to Assault Craft Unit Four (ACU 4) stationed at Little Creek Amphibious Base, Va., checks the propeller of a Landing Craft Air Cushion (LCAC).jpg?width=200 "A sailor checks the propeller of a [[Landing Craft Air Cushion]] hovercraft")
![George Huszar creating an [[Icon]]](https://commons.wikimedia.org/wiki/Special:FilePath/Georgeworking.jpg?width=200 "George Huszar creating an [[Icon]]")
Wikipedia
An aircraft propeller, also called an airscrew, converts rotary motion from an engine or other power source into a swirling slipstream which pushes the propeller forwards or backwards. It comprises a rotating power-driven hub, to which are attached several radial airfoil-section blades such that the whole assembly rotates about a longitudinal axis. The blade pitch may be fixed, manually variable to a few set positions, or of the automatically variable "constant-speed" type.
The propeller attaches to the power source's driveshaft either directly or through reduction gearing. Propellers can be made from wood, metal or composite materials.
Propellers are most suitable for use at subsonic airspeeds generally below about 480 mph (770 km/h), although supersonic speeds were achieved in the McDonnell XF-88B experimental propeller-equipped aircraft. Supersonic tip-speeds are used in some aircraft like the Tupolev Tu-95, which can reach 575 mph (925 km/h).
