Aquatic propulsion device

An aquatic propulsion device configured to be worn by a swimmer and comprising:

• a first portion configured to be securely attached to a leg of the swimmer, the first portion including a bearing part having an inner face shaped so as to bear on a tibia of the swimmer and an outer face opposite to the inner face,
• a second portion comprising a first foil and a foil support, the first foil being secured to the foil support and the foil support being configured to enable a rotational articulation of the second portion relative to the first portion according to an axis of rotation X1 to alternately switch the aquatic propulsion device from:
• a deployed configuration in which the first foil is configured to extend substantially, in continuation of a direction of the tibia of the leg of the swimmer, and
• to a retracted configuration in which the first foil is positioned between a foot and a head of the swimmer to enable the swimmer to walk, the second portion then being folded opposite the outer face of the bearing part,
• wherein the first foil of the aquatic propulsion device is positioned at a distance of at least 10 cm from the axis of rotation X1 so as to form in the second portion an opening enabling passage of the foot of the swimmer through said opening responsive to the aquatic propulsion device alternating between the deployed configuration and the retracted configuration.