Moskalyev SAM-25

The Moskalyev SAM-25 was an early 1940s Soviet, military assault transport, the last of a series of developments of the successful Moskalyev SAM-5.

SAM-25
Role Military assault and transport
National origin USSR
Manufacturer GAZ-18, Voronezh
Designer Alksandr Sergeyevitch Moskalyev
First flight 1942-3
Number built uncertain

Design and development

The single engine, high wing Moskalyev SAM-5bis-2 was a 1934 light transport developed into four more different types, of which the SAM-25 was the last. Apart from having a more powerful engine, it was an updated and refined version of the original.[1]

It had the same high-set, wooden, two spar, cantilever wing as the SAM-5bis-2, with ply-skin ahead of the forward spar forming a torsion resistant box. The whole surface, including the ply-skinned leading edge, was fabric covered. The SAM-25's wings introduced drooping ailerons, slotted automatic slotted flaps and automatic slats.[1]

It was powered by a nose-mounted 108–123 kW (145–165 hp) Shvetsov M-11F five cylinder, radial engine, installed with its cylinders largely exposed for cooling. As in the earlier versions, the fuselage had a wooden girder structure. The pilot's enclosed cockpit was ahead of the wing leading edge and the cabin was behind him under the wing. Its port side had a central entry door with one window ahead of it and entry door/stretcher hatch/photography window aft. Behind the cabin the fuselage narrowed to the SAM-5bis-2-style tail, with a blunted triangular fin and more rounded rudder, though the latter was now fuller, with trim tabs. A blunted triangular plan tailplane was mounted on top of the fuselage and carried rounded, tabbed elevators, separated for rudder movement.[1]

Like the SAM-14, the SAM-25 had fixed, wide-splayed cantilever landing gear, each side with a landing leg and drag strut within a common fairing.[1]

Operational history

It was evaluated from mid 1943. There has been some debate about production: later post-war evidence suggests there were no wartime machines but there was post-war series production from 1946 for Aeroflot.[1]

Specifications

Data from The Osprey Encyclopedia of Russian Aircraft 1875-1995[1]

General characteristics

  • Crew: one
  • Capacity: five passengers
  • Length: 8.02 m (26 ft 4 in)
  • Wingspan: 11.49 m (37 ft 8 in)
  • Wing area: 21.86 m2 (235.3 sq ft)
  • Airfoil: R-II
  • Empty weight: 720 kg (1,587 lb)
  • Gross weight: 1,280 kg (2,822 lb)
  • Powerplant: 1 × Shvetsov M-11F 5-cylinder radial, 108–123 kW (145–165 hp)
  • Propellers: 2-bladed

Performance

  • Maximum speed: 200 km/h (120 mph, 110 kn) at sea level
  • Range: 1,760 km (1,090 mi, 950 nmi)
  • Service ceiling: 4,850 m (15,910 ft)
  • Take-off distance: 150 m (490 ft)
  • Landing speed: 65 km/h (40 mph; 35 kn)

References
  1. Gunston, Bill (1995). The Osprey Encyclopedia of Russian Aircraft 1875-1995. London: Osprey (Reed Consumer Books Ltd). p. XXI, 254. ISBN 1 85532 405 9.
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