Word: nonrigid
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...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...
Like their colleagues overseas and on the same day, airship pilots of the U. S. Army Air Service had their troubles with a huge gas bag, in this case the TC-3, a nonrigid twin-motored airship of only 200,000 cu. ft., scarcely one-tenth the volume of the R-33. Sailing from Scott Field, III., the TC3 broke her rudder at Caseyville, Ill., soon after going aloft. For two hours, she drifted at the will of the wind, then negotiated a landing at Black Walnut, Mo., little the worse for wear...
...great rigid dirigibles do not roll or pitch as much as the smaller "Blimps" or nonrigid airships, but they develop a peculiar squirming, twisting motion and they always give a sensation of violent strain, with the hull quite plainly laboring under the force of the wind...
...largest nonrigid dirigible" of the Army Air Service, made a first cross-country flight of 500 miles from Akron, Ohio, to Belleville, Ill. " Safe but seasick " is the report of the officers and crew...