• Source: Chyetverikov MDR-3

The 3/info/mdr" target="_blank">MDR-3 (a.k.a.11) was a long-range flying boat designed and built in the USSR from 1931.




Development


In 1931, 3/info/chyetverikov" target="_blank">Chyetverikov was commissioned to design a new long-range flying boat for MA (Morskaya Aviatsiya – naval aviation). 3/info/chyetverikov" target="_blank">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 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 was a lack of faith in 3/info/chyetverikov" target="_blank">Chyetverikov's abilities to rectify the poor performance.
The 3/info/mdr" target="_blank">MDR-3 became the basis of the ANT-27, 3/info/mdr" target="_blank">MDR-4 and MTB-1.




Specifications (3/info/mdr" target="_blank">MDR-3)


Data from Gunston, Bill. “The Osprey Encyclopaedia of Russian Aircraft 1875–1995”. London, Osprey. 1995. ISBN 1-85532-405-9General characteristics
Crew: six
Length: 21.9 m (71 ft 10.5 in)
Wingspan: 32.2 m (105 ft 7.75 in)
Wing area: 153 m2 (1,649 sq ft)
Empty weight: 8,928 kg (19,683 lb)
Gross weight: 13,973 kg (30,805 lb)
Powerplant: 4 × BMW VI , 507 kW (680 hp) each
Performance

Maximum speed: 210 km/h (130.5 mph, 113.4 kn)
Range: 1,600 km (1,000 mi, 870 nmi)
Service ceiling: 2,200 m (7,218 ft)
Rate of climb: 4.76 m/s (937.4 ft/min)
Armament

1 × machine gun in a nose mounting.
1 × machine-gun in a dorsal mounting.




See also


List of flying boats and floatplanes
Short Knuckleduster




References

Kata Kunci Pencarian:

• Chyetverikov MDR-3
• Chyetverikov MDR-6
• Tupolev MTB-1
• OKB Chyetverikov
• MDR3
• Soviet Union military aircraft designation systems
• Short Sunderland
• List of bomber aircraft
• Beriev MDR-5
• 1934 Tupolev ANT-27 Sevastopol crash