Contrary-turning propeller combined with Z type fully reversible propelling unit is a noval energy-saving unit, which can provide the boats with incompasable operation features and propelling performance. This unit has combined the contrary-turning propeller with the fully reversible propelling unit into one, featuring the smooth rotation of the contrary turning propeller, low noise level, small diameter of the propeller and high propelling efficiency. The Z type fully reversible propelling unit can make the control of a boat more at ease, or help to make the boat turn 360 degrees at the same place, or make lateral movement. The successful combination of the two has produced an ideal propelling unit for various boats. This unit is of a compact structure, and it is low in price. It has found wide application in tugboats operating at the port, engineering boats for power-assisted positioning, fire-fighting boats and car-ferries in the Yangtze River. It has now being designated as a new-generation of energy-saving propelling unit by the Ministry of Communication.

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