The Myasishchev M-55 (NATO reporting name: Mystic-B) is a high altitude geophysical research aircraft developed by OKB Myasishchev in the Soviet Union, similar in purpose to the Lockheed ER-2, but with a twin boom fuselage and tail surface design. It is a twin-engined development of the Myasishchev M-17 Stratosphera with a higher maximum take-off weight.
The first aircraft of this series took off August 16, 1988. By 1993, there were six examples built.
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