The Beriev Be-10, also known as Izdelye M, (NATO reporting name: Mallow) was a twin engined, turbojet powered, flying-boat, patrol bomber built by the Soviet Union from 1955. The Be-10 is sometimes referred to as the M-10, though this designation is believed to apply only to the modified Be-10 that established 12 FAI world records in 1961, Bort no. 40 Yellow, still holding class records for speed and altitude. Design and development The Be-10 was designed in response to Council of Ministers of the Soviet Union directive No.2622-1105ss which called for a turbojet-powered flying boat for open-sea reconnaissance, bombing, torpedo attack and mine-laying. Stipulated performance was to include a maximum speed of and the ability to operate in wave heights of at wind speeds up to with submission for state acceptance trials in November 1955. OKB-49, under the leadership of Gheorgiy M. Beriev took up the challenge of designing and building the izdeliye M (Beriev OKB in-house designation), approval to proceed with prototype manufacture was received in mid-1954, but OKB-49 did not have facilities to build the prototype, so this was performed at the nearby GAZ no.89 (Gosudarstvenny Aviatsionnyy Zavod – state aviation plant/factory), also known as TMZD (Taganrogskiy Mashinostroitel'nyy Zavod imeeni Dimitrova – Taganrog Machinery Plant named after Gheorgi Dimitrov). Beriev realised that the Be-10 would be ready for trials during the winter of 1955, but Taganrog, where the OKB was located, is ice-bound in winter, so an alternative site was chosen at Gelendzhik on the Black Sea coast, which is clear of ice all year round. The completed components of the first prototype were transported to Ghelendjik where they were assembled and trials begun on 20 December 1955. Initial ground running of the engines revealed potentially disastrous vibration of the rear fuselage, which caused cracking of skin and structural components as well as loosening nuts and fasteners, also the fracture of pipeline and wiring loom support brackets. To reduce the vibration caused by the jet exhaust, the jet-pipes were splayed outboard by a further 3° to 6°. The prototype also underwent trial installation of raised extended air intakes to reduce water ingestion, but they were not adopted for in-service aircraft due to the degradation in performance. After the first flight of the Be-10 on 20 June 1956, manufacturers flight testing lasted a total of 76 flights up to 20 October 1958, whence the prototype was submitted for state