A propeller (often called a screw if on a ship or an airscrew if on an aircraft) 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 rotated. Propellers are used to pump fluid through a pipe or duct, or to create thrust to propel a boat through water or an aircraft through air.
A propeller (often called a screw if on a ship or an airscrew if on an aircraft) 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 rotated. Propellers are used to pump fluid through a pipe or duct, or to create thrust to propel a boat through water or an aircraft through air.
Source: Wikipedia "Propeller" · CC BY-SA 4.0
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