 Following the Hindenburg disaster, the age of the great airships was effectively over.During the late 1920s and early 1930s the available power from aero engines increased significantly, making possible the adoption of the fast cantilever-wing monoplane, originally pioneered as far back as late 1915.The ability to handle the high mechanical stresses imposed by this advanced form of airframe design philosophy suited the all-metal aircraft construction techniques pioneered by some earlier designers, and the increasing availability of high strength-to-weight aluminum alloys — first used by Hugo Junkers in 1916-17 as duralumin for his all-metal airframe designs — made it practical, allowing the earliest all-metal airliners like the Ford Trimotor designed by William Stout, and Junkers' own pioneering airliners like the Junkers F.13 to be built and accepted into service.