Beneš-Mráz Be-252
| Beneš-Mráz Be-252 Beta-Scolar | |
|---|---|
.jpg)
|
|
| Type: | Art and training aircraft |
| Design country: | |
| Manufacturer: | |
| First flight: |
1937 |
| Number of pieces: |
2 |
The Beneš-Mráz Be-252 Beta-Scolar was a Czechoslovak trainer aircraft from the 1930s.
development
The Be-252 was derived by Pavel Beneš in 1937 from the Be-52 sports aircraft from 1936 as a training aircraft for advanced training, but was more robust due to the more powerful engine and, like its predecessor, designed to be aerobatic. The only built example with the registration OK – BEZ completed its maiden flight in the same year. In 1938, the Be-252C ( OK – OYA ), equipped with a closed cabin, appeared . It was after the German occupation of the test site Rechlin passed and tested there. Then it was probably sold to Sweden. At the beginning of 1939, Beneš planned an aircraft called the Be-352C , which, in addition to the closed cockpit , was to have a six-cylinder in - line Major 6 engine . The occupation of the country prevented a practical implementation.
construction
The Be-252 was a cantilever low-wing aircraft in wood construction with a square fuselage cross-section. The three-part wing had expanding flaps and contained a 50-liter fuel tank on each side. The tail unit was also self-supporting and made of wood. The main wheels of the undercarriage were aerodynamically clad and, like the rear wheel, not retractable.
Technical specifications
| Parameter | Data (Be-252) | Data (Be-252C) |
|---|---|---|
| crew | 2 | |
| span | 10.66 m | |
| length | 7.45 m | 7.25 |
| height | 2.02 m | |
| Wing area | 14.0 m² | |
| Wing extension | 8.2 | |
| Wing loading | 63.5 kg / m² | 65 kg / m² |
| Power load | 5.6 kg / hp | |
| Area performance | 11.4 hp / m² | |
| Empty mass | 610 kg | 630 kg |
| Payload | 280 kg | |
| Takeoff mass | 890 kg | 910 kg |
| drive | an air-cooled nine - cylinder Walter Scolar radial engine |
|
| Starting power rated power |
180 PS (132 kW) at 2500 rpm 160 PS (118 kW) at 2200 rpm |
|
| Fuel volume | 100 l | |
| Top speed | 250 km / h | 275 km / h |
| Cruising speed | 215 km / h | 245 km / h |
| Landing speed | 70 km / h | |
| Rise time | 4.0 min at an altitude of 1000 m | |
| Service ceiling | 7000 m | 6000 m |
| Range | 500 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. 461.
- Václav Němeček: Československá letadla. Naše Vojsko, Prague 1968, pp. 146/147 and 296/297.
Web links
- Beneš-Mráz Be.252 Beta-Scolar. Retrieved June 25, 2019 (Russian).
Individual evidence
- ^ Hans-Joachim Mau: Czechoslovak aircraft from 1918 until today. Transpress, Berlin 1987, ISBN 3-344-00121-3 , p. 88