Bristol Type 138 High Altitude Monoplane

The Bristol Type 138 High Altitude Monoplane was a British high-altitude research aircraft developed and produced by the Bristol Aeroplane Company during the 1930s. It holds the distinction of setting nine separate altitude world records, the ultimate of these occurring on 30 June 1937, during a 2¼-hour flight flown by Flight Lieutenant M.J. Adam, in which he achieved a record altitude, which was later approved by the Fédération Aéronautique Internationale as having attained a maximum altitude of 53,937 ft (16,440 m).