The HZ-1 Aerocycle, also known as the YHO-2 and by the manufacturer's designation DH-4 Heli-Vector, was an American one-man "personal helicopter" developed by de Lackner Helicopters in the mid-1950s.
HZ-1 Aerocycle, juga dikenal sebagai YHO-2 dan oleh produsen penunjukan DH-4 Heli-Vector, adalah "helikopter pribadi" Amerika one-man yang dikembangkan oleh de Lackner Helicopters di pertengahan 1950-an.