ARK-4 - Utility flying boat, a mixed-contruction monoplane.
Che-2/MDR-6 Mud - Twin-engined (M-63) flying boat, first flown in 1937 and used until
the '50s. The Che-2 (named MDR-6 until 1941) had a high-set, slightly gulled
wing, with stabilising floats on the wingtips, that were retractable on some
models. Later models had Klimov M-105 engines and even M-107 engines.
Successful competitor of the Beriev MDR-5.
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