Propellers

thumb|upright=1.35|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. thumb|upright=1.35|Propeller of Pratt & Whitney Canada PW100 [[turboprop mounted on Bombardier Q400]]

aircraft component which converts engine torque into forward thrust

transversal propulsion device built in to some ships and boats

marine propulsion system

two-propeller design for improving low-airspeed maneuverability

Marine propeller with a non-rotating nozzle

propeller with blades that can be rotated to control their pitch while in use

right|thumb|300px|The outdrive unit of a boat with sterndrive A sterndrive or inboard/outboard drive (I/O) is a form of marine propulsion which combines inboard power with outboard drive. The engine sits just forward of the transom while the drive unit (outdrive or drive leg) lies outside the hull.

aircraft component

mathematical model in fluid dynamics

Propellers that rotate on opposite directions

toroid-shaped propeller for higher efficiency and lower noise

mathematical process by William Froude