is used for high speed vessels with increased exposure to cavitation and vessels that want to reduce noise levels, such as warships. See also References Bibliography (2007): Marine Propellers and Propulsion, Butterworth-Heinemann (2004): Basic Ship Propulsion, Allied Publishers (1970): Wake Adapted Ducted Propellers, Nederlands Schip Model Basin, Wageningen External links Rice Speed Nozzle and Propeller Tug boat glossary Papers by L. Stipa, translated by the NACA Damen Marine Components Netherlands Propellers Marine propulsion Nozzles