The MR-2 was similar to the MRL-1 but had a more powerful engine and larger upper wing, while the hull design was improved and less expensive materials used in its construction. Flights beginning in September 1926 impressed the MR-2's designers, and state acceptance trials were carried out by VVS pilot F.S.Rastegaev. One flight on October 19, however, ended in disaster when the MR-2 lost stability, and longitudinal oscillations with increasing amplitude resulted in steep dive, causing the aircraft to crash into the water up-side-down.[1]
^Shavrov, Vadim Borisovich (1988).Istorii︠a︡ konstrukt︠s︡iĭ samoletov v SSSR do 1938 g. (in Russian) (Izd. 5-e, ispr ed.). Moscow: Mashinostroenie.ISBN5-217-03112-3.
Kulikov, Victor (December 1996). "Le fascinante histoire des hydravions de Dimitry Grigorovitch" [The Fascinating History of the Seaplanes of Dimitry Grigorovitch].Avions: Toute l'aéronautique et son histoire (in French) (45):20–33.ISSN1243-8650.
