Beneš-Mráz Be-50
| Beneš-Mráz Be-50 / Be-51 Beta-Minor |
|
|---|---|
.jpg) Beneš-Mráz Be-50 |
|
| Type: | School and sport aircraft |
| Design country: | |
| Manufacturer: | |
| First flight: |
1935 |
| Production time: |
1937-1939 |
| Number of pieces: |
Be-50: 54 Be-51: 125 |
The Beneš-Mráz Be-50 and Be-51 Beta-Minor were Czechoslovak training and sport aircraft . They formed the beginning of a series of civilian types that enjoyed great popularity in the 1930s from the Beneš-Mráz company founded in Choceň in 1935 .
development
In the year their company was founded, Pavel Beneš and Jaroslav Mráz designed the Be-50 as the second construction after the Be-60 . The first prototype, followed by a second, made its maiden flight in the same year. The following year, two Be-50s took part in the Angers International 12-Hour Prize . The construction of two series, comprising a total of 54 pieces, was carried out in 1937. The Be-51 appeared as its successor in 1937, which differed from its predecessor in terms of its reduced wingspan and wing area and also had a closed canopy. Production started in 1938 and continued after the German occupation of the country . Of the 52 Be-51s built in 1938, twelve were taken over by the Air Force and used as liaison aircraft and for school assignments. In 1939, 73 more aircraft were produced, so that the total number of Be-51 built was 125 pieces.
As a further successor to the Be-50, the Be-52 Beta-Major with a length of 7.06 m and its single-seat counterpart Be-56 with 7.55 m were built in 1936 . Both had a wingspan of 10.66 m, were equipped with a more powerful Major-4 engine and remained prototypes.
construction
The Be-50 / Be-51 were cantilevered low-wing aircraft in all-wood construction . The fuselage and the three-part wing had plywood planking . Both types were equipped with a double steering wheel and a self-supporting normal tail unit made of wood. The main wheels of the chassis were rigid and provided with aerodynamic panels ("trouser leg chassis"), and there was a grinding spur at the rear.
Technical specifications
.jpg)
| Parameter | Data (Be-50) | Data (Be-51) |
|---|---|---|
| crew | 2 | |
| span | 12.16 m | 11.44 m |
| length | 7.76 m | |
| height | 1.80 m | 2.05 m |
| Wing area | 16.30 m² | 15.30 m² |
| Wing extension | 9.1 | |
| Wing loading | 50.7 kg / m² | 45.9 kg / m² |
| Power load | 5.5 kg / hp | 7.9 kg / hp |
| Area performance | 9.3 hp / m² | 5.8 hp / m² |
| Preparation mass | 420 kg | 480 kg |
| Payload | 280 kg | 270 kg |
| Takeoff mass | 700 kg | 750 kg |
| drive | an air-cooled four-cylinder in - line engine Walter Minor 4-I | |
| Starting power rated power |
95 PS (70 kW) at 2550 rpm 85 PS (63 kW) at 2260 rpm |
|
| Top speed | 200 km / h | 205 km / h |
| Cruising speed | 170 km / h | 175 km / h |
| Landing speed | 50 km / h | 60 km / h |
| Rate of climb | 3.3 m / s near the ground | |
| Rise time | 5.0 min at 1000 m altitude | |
| Service ceiling | 4600 m | |
| Range | 750 km | |
literature
- Peter Alles-Fernandez (Ed.): Aircraft from A to Z. Volume 1: Aamsa Quail – Consolidated P2Y. Bernard & Graefe, Koblenz 1987, ISBN 3-7637-5904-2 , p. 212.
- Werner von Langsdorff : Handbook of aviation. Year 1939, 2nd, unchanged edition, J. F. Lehmann, Munich 1937, p. 460.
- Václav Němeček: Československá letadla. Naše Vojsko, Prague 1968, pp. 143–146 and 294–297.
