| 摘要 |
A hull is configurated as a lifting body, for instance as an airfoil, teardrop or the like. At its leading end portion one or more undulator units are mounted, each having one or more vanes which rotate about an axis normal to the longitudinal axis of the hull. This produces an undulatory fluid stream flowing opposite the intended direction of movement and providing the desired thrust. Alternate sweeping of the undulatory fluid stream over surfaces of the hull downstream of the units causes deundulation of the stream which increases the propulsive thrust.
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