The present invention involves a system for the release of low relief, self-orienting deployable payloads from a platform such as an underwater vehicle and a mechanism of passive buoyancy compensation of the vehicle. The system secures one or more payloads by a vacuum force without an additional mechanical restraining mechanism and deployment of a payload is accomplished by disengaging the vacuum hold to release the payload for its intended function. Once deployed, the payload may reorient itself to a functional orientation without additional assistance.

Disclosed is a hydrodynamic effect device (100) for a flotation body (10) of an inflatable water sports device (1). The hydrodynamic effect device (100) comprises an attachment portion (102) for attaching the hydrodynamic effect device (100) on the rear end (18) of the flotation body (10), for example on the bottom (12) of the flotation body (10). The hydrodynamic effect device (100) comprises at least one separating edge portion (104) which is movable relative to the attachment portion (102) and which, when the flotation body (10) is moved on the water surface, is in contact with water in order to effect an improved and flexible flow separation at least on the rear end (18) of the flotation body (10).

Disclosed is a hydrodynamic effect device (100) for a flotation body (10) of an inflatable water sports device (1). The hydrodynamic effect device (100) comprises an attachment portion (102) for attaching the hydrodynamic effect device (100) on the rear end (18) of the flotation body (10), for example on the bottom (12) of the flotation body (10). The hydrodynamic effect device (100) comprises at least one separating edge portion (104) which is movable relative to the attachment portion (102) and which, when the flotation body (10) is moved on the water surface, is in contact with water in order to effect an improved and flexible flow separation at least on the rear end (18) of the flotation body (10).