Moskalyev SAM-25
| {{Infobox aircraft begin
| name=SAM-25 | image= | caption= }}{{Infobox aircraft type | type=Military assault and transport | national origin=USSR | manufacturer=GAZ-18, Voronezh | designer=Aleksandr Sergeyevitch Moskalyev | first flight=1942-3 | introduced= | retired= | status= | primary user= | more users= | produced= | number built=uncertain | program cost= | unit cost= | developed from= | variants with their own articles= }} |
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.
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.
It was powered by a nose-mounted {{cvt|145-165|hp|kW|order=flip}} 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.
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.
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.
Specifications
{{Aircraft specs
|ref=The Osprey Encyclopedia of Russian Aircraft 1875-1995
|prime units?=met
|genhide=
|crew=one
|capacity=five passengers
|length m=8.02
|length note=
|span m=11.49
|span note=
|height m=
|height ft=
|height in=
|height note=
|wing area sqm=21.86
|wing area note=
|aspect ratio=
|airfoil=R-II
|empty weight kg=720
|empty weight note=
|gross weight kg=1280
|gross weight note=
|max takeoff weight kg=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity=
|more general=
|eng1 number=1
|eng1 name=Shvetsov M-11F
|eng1 type=5-cylinder radial
|eng1 hp=145-165
|eng1 note=
|power original=
||more power=
|prop blade number=2
|prop name=
|prop dia m=
|prop dia ft=
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|perfhide=
|max speed kmh=200
|max speed note=at sea level
|cruise speed kmh=
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|cruise speed kts=
|cruise speed note=
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|never exceed speed kmh=
|never exceed speed mph=
|never exceed speed kts=
|never exceed speed note=
|range km=1760
|range note=
|endurance=
|ceiling m=4850
|ceiling note=
|g limits=
|roll rate=
|glide ratio=
|climb rate ms=
|climb rate ftmin=
|climb rate note=
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- Take-off distance: {{cvt|150|m|ft}}
- Landing speed: {{cvt|65|km/h|mph kn}}
}}
References
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{{Moskalyev aircraft}}
Category:Single-engined tractor aircraft