FIELD: lighter-than-air aerostats; manufacture of highly efficient semi-rigid airships. SUBSTANCE: semi-rigid airship includes fin framework, shell nose and aft compartments, middle compartment and gastight rigid partitions. Ballast reservoirs in form of cluster of rigid finned spheres resting against rigid gastight partitions are located in nose and aft compartments; they are equidistantly inscribed in contour of nose and aft extremities of airship. Ballast reservoirs are filled with pressure air. EFFECT: enhanced efficiency in all modes of flight, stoppage and hovering. 2 cl, 2 dwg, 5 ex
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