https://static3.businessinsider.com/image/5f5a9a59e6ff30001d4e8334-1778/December%2015%202010%20Wing%206%E2%80%94an%20early%20prototype%E2%80%94was%20used%20to%20test%20autonomous%20transition%20from%20hover%20to%20crosswind%20flight.jpg