Origins and background
On August 2, 1951, the Company obtained a contract for the design and supply of an MD 452 Mystère IV aircraft derived from the Mystère II, capable of reaching Mach 1 in a nose-down attitude, but without considering mass production. The fuselage, more refined, of circular section in its front and rear parts, has a central part of piriform section with broad base. The Mystère IV 01 is equipped with the Rolls Royce Tay centrifugal engine, more powerful and more reliable than the Atar axial engine, preferred by the army but whose development is not yet completed.
The first flight of the Mystère IV 01, piloted by Kostia Rozanoff, took place at Melun-Villaroche on September 28, 1952. It lasts 25 minutes. With the same engine as the Mystère II, it reached a maximum level speed of Mach 0.92 (instead of 0.87) and on January 17, 1953, on its 34th flight, it broke the sound barrier in a dive.
The first Mystère IV A delivered to the French Air Force was taken delivery of by the 12th Wing at Cambrai on 25 May 1955. The first aerobatic patrol equipped with the new aircraft was formed at this base. On July 14, 1955, twelve of its aircraft paraded over the Champs Elysées.