Movement device for progressive movement on the surface of a body around which a fluid passes

A travel device for movement on the surface of a body flowed around by a fluid, the travel device comprising:

• a holding system for adhesion of the travel device to the surface;
• a traction system for fixing a course of the travel device on the surface;
• and
• a drive system for driving a travel movement of the travel device on the surface, the drive system having at least one flow body that can be flowed around for interaction with the fluid so that flow energy can be taken from the fluid flowing around for the movement of the travel device on the surface of the body flowed around by the fluid and the flow energy is usable for the drive of the travel movement,
• wherein the drive system is configured such that flow energy taken from the fluid flowing around by momentum transfer onto the at least one flow body for the movement of the travel device is usable for a direct fluid dynamic drive of the travel movement, and
• wherein the travel device is free of mechanical connections to external drive means and/or external retaining means.