High Quality Content by WIKIPEDIA articles! The K-class non-rigid airship was a class of blimps built by the Goodyear Aircraft Company of Akron, Ohio for the United States Navy. These blimps were powered by two radial air-cooled engines mounted on outriggers on the side of the control car that hung under the envelope. Before and during World War II, 135 K-class blimps were built, configured for patrol and anti-submarine warfare operations and were extensively used in the Navy’s anti-submarine efforts in the Atlantic and Pacific Ocean areas.