On Stalin's orders Vladimir Gregorovich Yermolaev began
design work on a long-range bomber, the DB-240 prototype
of which first flew in
1940. This twin diesel-engined
low-wing monoplane was based on the design of R. L.
Bartini's Stal' 7 and had the same distinctive inverted-gull
wings. Designated Yer-2, more than 400 were built 1940-
1944 and used principally as long-range night bombers.
A Yer-20N special-purpose long-range transport version,
which carried 18 passengers, was developed from the