Work on the XH-17 began in 1949, but some financial difficulties of Hughes’ associate postponed the project for two years. Finally, in 1952, on October 23, the massive Frankensteinian aircraft ...

Designed with the world’s largest rotor, the XH-17 erupted in flames and noise as it lifted off in 1952. Its thunderous blades were heard miles away, marking a spectacular—and terrifying ...