- (AKA ducted propeller) A cylindrical fitting around the propeller.
Early 20th century. Named after German engineer, Ludwig Kort.
Provides more efficient and powerful thrust for a vessel moving under ~10 knots. Thus, it’s useful for tug boats, fishing trawlers, or vessels that need good maneuverability at low speeds. The shape and design of the nozzle itself also has effects of maneuverability.
Rogers, J.G. (1985). Origins of Sea Terms. Mystic, CT: Mystic Seaport Museum.