Grigorovich MU-2 explained

The Grigorovich MU-2 was a trainer flying boat built in the Soviet Union in the mid-1920s. It was designed by the Grigorovich Design Bureau after the failure of the Grigorovich MUR-1, featuring an all-metal hull. However, it was never put into production due to poor performance and sluggish take-off behavior.

Bibliography

• Book: Shavrov, V. B. . ru:История конструкций самолетов в СССР . 1985 . Машиностроение . Moscow . Russian . Vol 1 pp.401-402 .
• Kulikov. Victor. Le fascinante histoire des hydravions de Dimitry Grigorovitch. Avions: Toute l'aéronautique et son histoire . December 1996 . 45 . 20–33 . The Fascinating History of the Seaplanes of Dimitry Grigorovitch. French . 1243-8650.