Bartel BM-5
| Bartel BM-5 | |
|---|---|
|
|
| Type: | Trainer aircraft |
| Design country: | |
| Manufacturer: | |
| First flight: |
July 27, 1928 |
| Commissioning: |
1929 |
| Production time: |
1929-1932 |
| Number of pieces: |
60 + 2 prototypes |
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The Bartel BM-5 was one of the in Poznań -based "Wielkopolska aircraft factory AG" ( Wielkopolska Wytwórnia Samolotów shortly WWS) made trainer aircraft of the late 1920s.
development
The chief designer of the WWS, Ryszard Bartel, derived this type from the BM-4 as an enlarged further development for the engine class from 200 hp. Both aircraft were created based on the same program that the Polish Ministry of Aviation launched in 1927 to support the domestic aviation industry to provide the Polish Air Force with suitable training aircraft. Two prototypes were commissioned, the first of which was designated the BM-5a and received an Austro-Daimler engine with which it completed its maiden flight on July 27, 1928. The subsequent testing confirmed the good-natured flight characteristics that are important for a training aircraft and that had already predestined the BM-4 for this task. The BM-5a was presented to the public at the Polish National Exhibition in Poznań in May 1929. A month earlier, the second prototype, improved in some respects, took off on its first flight on April 15th. It was equipped with an Italian SPA-6A engine with 220 hp and was given the abbreviation BM-5b . He also passed the flight tests without any complaints and was selected as the starting type for series production, which began in 1929 and included both the BM-5a version with the Austro-Daimler and the BM-5b with the SPA drive. In 1930, production ended after 40 BM-5s had been built, which were mainly used at the Air Force Central Flight School in Dęblin .
In the meantime, the second prototype BM-5b had been converted to a Spanish Hispano-Suiza-8Fb - eight-cylinder engine with 300 hp and tested as the BM-5c with good results. This version was also intended for series production, but a fire that destroyed large parts of the WWS production facilities in 1931 and essentially contributed to the financial ruin of the company in 1931 delayed delivery. It was not until 1932 that 20 BM-5c could be handed over to the air force , which also flew at the Dęblin flight school. After some time, BM-5, the original engines built by Škoda in license were at 20 radial engines of the type Wright J-5 "Whirlwind" replaced. Thanks to their longevity, these specimens could be flown for a long time and some were still in service with the Polish armed forces when Poland was attacked in September 1939.
Technical specifications
| Parameter | Data (BM-5a) |
|---|---|
| crew | 2 |
| span | 11.20 m |
| length | 7.81 m |
| height | 3.18 m |
| Wing area | 31 m² |
| Empty mass | 906 kg |
| Takeoff mass | 1294 kg |
| drive | a liquid-cooled six - cylinder in - line engine Austro-Daimler 6 with 220 PS (162 kW) |
| Top speed | 164 km / h near the ground |
| Rise time | 8.10 min at 1000 m altitude |
| Service ceiling | 3800 m |
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. 173.
Web links
- Bartel BM-5 (BM-300), 1928. Retrieved January 23, 2020 (Polish).