Word: semirigid
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...hour later the shape returned to the field, gliding softly down through the twinkling myriads of snow. The creature's masters left their perches beneath her helium-filled belly. They reported that their charge, the RS-1, sole semirigid* dirigible in the U. S. and largest in the world, had conducted herself most gracefully on her frost-christened maiden flight. Aloft there had been an elevenmile wind, through which she had glided at 40 m. p. h. in steady circles over her abode...
...Nonrigid airships (balloons) are constructed with no metal framework in the gasbag save a ring at the bottom to which fabric, valves and passenger basket are attached. The semirigid dirigible ("blimp") employs a keel or spine of structural metal usually aluminum, to stiffen the under side of the envelope, support cabins, motors, crew. The rigid (Zeppelin) type of ship has a complete skeleton of struts and girders, with hoops articulated laterally inside its spine and ribs to form separate gas chambers when covered with fabric inside as well...
...largest semirigid airship in the world, the TC-2, having a gas capacity of 750,000 cubic feet, is being completed by the Goodyear Tire & Rubber Co., of Akron, Ohio, to serve as an airplane carrier. The Washington Naval Conference placed a limitation on the number and tonnage of ship airplane carriers, but no such restriction was placed on airship carriers-at that time scarcely thought of as practicable. Army experts also claim that the airship carrier will have many advantages over the naval airplane carrier...