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Mráz M-1 Sokol
Benes-Mraz M.1 Sokol



M.1C Sokol


The Mráz M.1 Sokol (English: "Falcon") was a light aircraft built in Czechoslovakia in the years following the end of the Second World War. Designed in secret by Zdeněk Rublič at the Beneš-Mráz factory during the German occupation.
The Sokol was a conventional, low-wing monoplane that took the pre-war Beneš-Mráz Bibi as its starting point. Two seats were provided side-by-side in an enclosed cabin, and the main units of the tailwheel undercarriage were retractable. Construction throughout was of wood.
M.1/1 prototype
The prototype, then designated the M.1/1 and registered as OK-ZHA, first flew on 9 March 1946, following test flights the prototype was designated the M.1A as the two-seat-version. A re-engined two-seater was built designated the M.1B with a ZLAS Toma 4 engine, it first flew on 19 May 1946 but only one was built. The design was then modified as the M.1C with a third-seat in the rear and first flying on 16 February 1947. The M.1C became the main production variant and 183 aircraft were built.
M1C Sokol G-AIXN at Leeds (Yeadon) in 1954, and was still airworthy in 2019
In 1948 the M.1C was further developed as the M.1D with an enlarged single-piece canopy and a revised rudder. The M.1D first flew on 4 October 1948 and 104 were built. One M.1D was fitted with locally produced floats and re-designated the M.1E, it first flew in September 1949. A minor variant was the Para-Sokol which was fitted with rearward sliding canopy to allow parachutists to leave the aircraft.
Some were operated by the Czechoslovakian National Security Guard and Egyptian Air Force.
Around 284 aircraft were built but the wooden-glued airframes were condemned in the early 1960s and withdrawn from use, under 20 were still in existence in the 2010s but only a few were flyable.
G-AIXN landing at its home base of Turweston Aerodrome in the United Kingdom in 2017
Some are on display at Museums in the Czech Republic, Hungary, Beijing, China, and Datangshan, China.
M1C Sokol
Original two-seat version
Engine: Walter Minor
Similar to M-1A
Engine: ZLAS Toma
1 built
Revised version, with longer fuselage and third seat, and swept leading edges on wing
183 built
Similar to M-1C with new, single-piece canopy and larger rear windows
Engine: 1 × Walter Minor 4-III, 78 kW (105 hp)
Wingspan: 10.0 m (32 ft 10 in)
Length: 7.35 m (24 ft 1 in)
Wing area: 13.8 m2 (149 sq ft)
Height: 2.20 m (7 ft 3 in) (tail up)
Empty weight: 425 kg (937 lb)
Gross weight: 780 kg (1,720 lb)
Maximum speed: 240 km/h (150 mph, 130 kn)
Cruise speed: 212 km/h (132 mph, 114 kn)
Range: 1,000 km (620 mi, 540 nmi)
Service ceiling: 4,800 m (15,700 ft)
Rate of climb: 3.0 m/s (590 ft/min)
Crew: 1
Capacity: 2 passengers
104 built
Similar to M-1D but equipped with pontoons
at least 1 built




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