Moskalyev SAM-11
| {{Infobox aircraft begin
| name=SAM-11 | image= | caption= }}{{Infobox aircraft type | type=Four seat amphibian | national origin=USSR | manufacturer=GAZ-18,Voronezh | designer=Aleksandr Sergeyevitch Moskalyev | first flight=(SAM-11) 1939-40; (SAM-11bis) September or October 1940 | number built=1 | developed from=Moskalyev SAM-5bis-2 | variants with their own articles= }} |
The Moskalyev SAM-11 was an amphibious version of the SAM-5bis-2, with a flying boat hull, retractable landing gear and raised engine and tail to avoid spray. Only one was built.
Design and development
Like the Moskalyev SAM-10, the wooden SAM-11 was a development of the SAM-5bis-2, sharing the same cantilever high wing and tail though with the tailplane raised well above the fuselage.
The original SAM-11 was powered by a tractor configuration, 220 kW (300 hp) inverted, air-cooled, six cylinder inline Bessonov MM-1 engine in a nacelle above the wing on a central pylon.
The amphibian had a two-step planing bottom of V-section, with the first step under mid-chord. The hull was flat-sided and contained a cabin for the pilot and three passengers with the pilot ahead of the wing leading edge and with two windows on each side for the passengers. Rounded upper decking behind the cabin led to a blunted triangular fin and more rounded rudder. The triangular plan tailplane was mounted at about one third fin height and carried rounded, tabbed elevators, separated for rudder movement.
On water the SAM-11 relied for stability on stepless stabilizing floats, wing-mounted on pairs of vertical struts and braced by inward leaning struts. On land there were a pair of mainwheels on bungee-sprung, cantilever legs like those of the SAM-5bis-2. There, the legs were fixed to the fuselage underside but the planing bottom of the SAM-11 meant that they had to be attached to the plywood-covered sides, reinforced in that area. The legs and their trailing drag struts were hinged so the wheels could be manually cranked up into wing recesses. The rear step carried a small, fixed tailwheel on a streamlined extension. Aft, there was a small water rudder.
Operational history
The SAM-11 was built in 1939 but its date of first flight is not known. That first flight was not a success; turbulent prop-wash reaching the tail surfaces produced a loss of control and the SAM-11 was damaged. It was rebuilt as the SAM-11 bis, fitted with a {{cvt|270|hp|kW|order=flip}} Voronezh MV-6 engine in a redesigned nacelle, the engine change forced by unobtainability of the more powerful MM-1. It was first flown in early autumn 1940.
It was officially tested at Sevastopol and flew satisfactorily but did not reach production as its payload with the lower power MV-6 was judged too small.
Variants
;SAM-11: Original design with {{cvt|300|hp|kW|order=flip}} MM-1 engine
;SAM-11bis: Rebuilt SAM-11 with {{cvt|270|hp|kW|order=flip}} MV-6 engine in revised nacelle
Specifications (SAM-10bis)
{{Aircraft specs
|ref=
|prime units?=met
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|crew=one
|capacity=three passengers
|length m=8.74
|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=
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|empty weight kg=1030
|empty weight note=
|gross weight kg=1510
|gross weight note=
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|more general=
|eng1 number=1
|eng1 name=Voronezh MV-6
|eng1 type=inverted, air-cooled, six cylinder inline
|eng1 hp=270
|eng1 note=
|power original=
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|prop blade number=2
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|max speed kmh=240
|max speed note=at {{cvt|2400|m|ft}}
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|ceiling m=5600
|ceiling note=
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- Take-off distance: {{cvt|200|m|ft}}
- Landing speed and distance: {{cvt|85|km/h|mph kn}}, {{cvt|110|m|ft}}
}}
References
{{reflist|refs=
- }}
{{Moskalyev aircraft}}
Category:Single-engined tractor aircraft