Derek Smith (television producer) looking at life at a US Air Force base at Mildenhall in East Anglia. (1967) Smith produced "The Flight Deck Story", the history of the aircraft carrier, filmed on HMS Eagle and on USS Enterprise off the coast of Vietnam. He also produced "Mission To Hell", which followed the Bishop of Birmingham Leonard Wilson returning to Singapore to tell his story of war time imprisonment by the Japanese Army. Another military history film Smith made at this time was "Jump Jet", the history of the Hawker Harrier, vertical take-off or land aircraft. A film for the series The World About
Claims to the first powered flight that have received significant attention include: In judging these claims, the generally accepted requirements are for sustained powered and controlled flight. In 1890 Ader had made a brief uncontrolled and unsustained "hop" in his Éole, but such a hop is not regarded as true flight. The ability to take off unaided is also sometimes regarded as necessary. The air historian Charles Gibbs-Smith has said that, "The criteria of powered flight must remain to some extent a matter of opinion." Some notable powered hops were made before the problem of powered flight was finally solved. In 1874 Félix du Temple built