Moskalyev SAM-25

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

Last updated January 11, 2022

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.

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)

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References

1 2 3 4 5 6 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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[Russ-1] 1 2 3 4 5 6 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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