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This suggests that the M5 is based on a Curtiss flying boat - other sorces - eg Gunston, Bill (1995). The Osprey Encyclopedia of Russian Aircraft from 1875 - 1995. Osprey Aerospace. ISBN  1-85532-405-9. suggest that is a development of a serirs of Grigorovich flying boats, originally originating in the pre-war repair of a Frech flying boat. Nigel Ish 20:25, 6 February 2007 (UTC) reply

I don't have too much information on these aircraft, but the Finnish article claims the same thing (that it was based on the French F.B.A.-flying boat). Could it be that the Curtiss originally was based on the French aircraft? -- MoRsE 20:45, 6 February 2007 (UTC) reply

The Durkota book suggests that it was a development of previous Grigorovich types, leading back to a Donnet Leveque. NiD.29 ( talk) 01:28, 6 September 2013 (UTC) reply