The Goodyear Inflatoplane was an inflatable experimental aircraft made by the Goodyear Aircraft Company, a subsidiary of Goodyear Tire and Rubber Company, well known for the Goodyear blimp. Although it seemed an improbable project, the finished aircraft proved to be capable of meeting its design objectives, although orders were never forthcoming from the military. A total of 12 prototypes were built between 1956 and 1959, and testing continued until 1972, when the project was finally cancelled. Design and development The original concept of an all-fabric inflatable aircraft was based on Taylor McDaniel's inflatable rubber glider experiments in 1931. Designed and built in only 12 weeks, the Goodyear Inflatoplane was built in 1956, with the idea that it could be used by the military as a rescue plane to be dropped in a hardened container behind enemy lines. The 44 cubic ft (1.25 cubic meter) container could also be transported by truck, jeep trailer or aircraft. The inflatable surface of this aircraft was actually a sandwich of two rubber-type materials connected by a mesh of nylon threads, forming an I-beam. When the nylon was exposed to air, it absorbed and repelled water as it stiffened, giving the aircraft its shape and rigidity. Structural integrity was retained in flight with forced air being continually circulated by the aircraft's motor. This continuous pressure supply enabled the aircraft to have a degree of puncture resilience, the testing of airmat showing that it could be punctured by up to six .30 calibre bullets and retain pressure. There were at least two versions: The GA-468 was a single-seater. It took about five minutes to inflate to about ; at full size, it was long, with a wingspan. A pilot would then hand-start the two-stroke cycle, Nelson engine, and takeoff with a maximum load of . On 20 US gallons (76 L) of fuel, the aircraft could fly , with an endurance of 6.5 hours. Maximum speed was , with a cruise speed of 60 mph. Later, a engine was used in the aircraft. Takeoff from turf was in 250 feet with 575 feet needed to clear a 50-foot obstacle. It landed in 350 feet. Rate of climb was 550 feet per minute. Its service ceiling was estimated at 10,000 ft. The GA-466 was the two-seater version, shorter, but with a longer wingspan than the GA-468. A more powerful McCulloch 4318 engine could power the of plane