Proposing a new idea for spacecraft propulsion that involves dynamic soaring
The possibility of exploiting dynamic soaring for spaceflight using a magnetohydrodynamic wing with a large value of lift-to-drag ratio was first suggested by Birch , who proposed a vehicle interacting with the turbulent clouds of the interstellar medium in order to gain velocity. Interestingly, charged particles bouncing between turbulent clouds in the ISM was suggested by Fermi as a potential source of galactic cosmic rays in 1949 , a mechanism now called second-order Fermi acceleration.
In this paper, a new concept for spacecraft propulsion that invokes dynamic soaring is proposed. In this concept, lift is generated by extracting power in one direction and accelerating flow in the other direction. This approach builds upon the concept of a propulsive drive that is powered by external dynamic pressure [the so-called)], however, in the present concept, no onboard reaction mass is used.
The mechanism by which lift can be generated by interacting with a stream of particles blowing past a vehicle is illustrated in , which is formulated in a vehicle-fixed reference frame. The vehicle and its interaction with streams of particles is represented by a control volume. Power is extracted from stream 1, decreasing the velocity by Δin the direction perpendicular to the original stream. If energy is conserved in this interaction,
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