Propellant natatorium. Comprises a tubular structure (1) fastened to the leg and foot human ligatures (5,6). Attached to the upper inside of the tubular structure (1) there is a valve (2) which opens downward with a spring (3) keeping it closed when the system is in reposo.La valve (2) abuts a flange inner (4) provided perpendicularly to natatorio propellant. When the propellant natatorio is driven backward, the inertia of the water trapped therein causes a thrust forward in the swimmer on the principle of action / reaction of Newton's third law. In the reverse movement the valve (2) is opened by the water passes freely through the propellant natatorio. It has industrial applications. variants with a compound or with fasteners adapted to an oar or human arm and hand valve are provided.
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