The present invention describes a propulsion-jet propulsion system, an amphibious vehicle that comprises an aquatic propulsion system, and an amphibious-vehicle-navigation method. Specifically, the present invention comprises a propulsion-jet propulsion system that may be used on vehicles such as an amphibious combat vehicle, i.e. a vehicle that moves both on dry land and in water and which comprises at least one propulsion system, comprising propulsion-jet propulsion that enhances the speed, manoeuvrability, stability and steerability of the vehicle, which are essential features for military vehicles in combat, rescue and emergency situations. The present invention pertains to the fields of mechanical engineering, naval engineering, fluid dynamics and means of transportation.
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