Propeller Wash

The accelerated, rotating and turbulent stream of water produced by a working propeller.

Propeller wash acts on the rudder and nearby hull, contributing to low-speed manoeuvring, and can extend behind or ahead of the vessel depending on propulsion direction. Its strength depends on power, propeller, depth and surrounding structures.

Near berths it can move other craft, erode the bed, lift debris and endanger swimmers or line handlers. Wash should not be confused with wake, which includes waves and displacement effects from the whole vessel.