The MDR-3 (a.k.a. 11 ) was a long-range flying boat designed and built in the USSR from 1931.
5-465: In 1931, Chyetverikov was commissioned to design a new long-range flying boat for MA ( Morskaya Aviatsiya – naval aviation). Chyetverikov used few new parts, borrowing wings, tailplane and engine nacelles (mounted above the wing) from the Grigorovich TB-5 and a scaled-up Grigorovich ROM-2 fuselage. The use of ready designed or built components led to quick construction of the prototype which
10-540: Was a lack of faith in Chyetverikov's abilities to rectify the poor performance. The MDR-3 became the basis of the ANT-27, MDR-4 and MTB-1. Data from Gunston, Bill. “The Osprey Encyclopaedia of Russian Aircraft 1875–1995”. London, Osprey. 1995. ISBN 1-85532-405-9 General characteristics Performance Armament Grigorovich TB-5 The Grigorovich TB-5 ( Russian : Григорович ТБ-5 )
15-613: Was an experimental heavy bomber designed and tested in the Soviet Union in the early 1930s. Designed as a competitor for the Tupolev TB-3 , the TB-5 was intended to be powered by two FED 24-cylinder X engines of 746 kW (1,000 hp) each. When these were canceled, the underwing pods were revised to each house a pair of Bristol Jupiter engines in a push-pull configuration . Despite projected performance inferior to TB-3, it
20-408: Was hoped that TB-5 would gain an advantage by using less metal (in short supply at the time) thanks to its mixed construction of fabric-covered metal frame. Test flights began on 1 May 1931 with disappointing results, in part due to poor thrust of the rear-facing engines. The prototype TB-5 was wrecked in a crash landing following the in-flight detachment of an engine in the spring of 1932, and with
25-671: Was ready for flight tests in Dec 1931. These commenced in January 1932 after the aircraft was transported to Sevastopol in the Crimea . Despite fast construction and excellent structural qualities, results of the flight tests were disappointing. Takeoff time was 36 seconds, climb rate less than a metre per second and the ceiling was only 2,200m. As a result project was transferred to KOSOS ( Konstrooktorskiy Otdel Sektora Opytnovo Stroitel'stva – section of experimental aeroplane construction), as there
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