Bartel BM-6
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| Bartel BM-6 | |
|---|---|
| Type | Trainer aircraft |
| Manufacturer | Samolot |
| Maiden flight | 8 April 1930 |
| Status | Prototype |
| Primary user | Polish Air Force |
| Number built | 1 |
The Bartel BM-6 was a Polish biplane trainer fighter aircraft of 1930. It did not advance beyond the prototype stage.
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[edit] Design and development
The aircraft was designed by Ryszard Bartel in the Samolot factory in Poznań, as a trainer-fighter plane. The BM-6 prototype, designated BM-6a, was flown on 8 April 1930 in Poznań. Its advantage was an easy construction and maintenance, according to Bartel's design philosophy. A distinguishing feature of all Bartels was an upper wing of a shorter span, because lower and upper wing halves were interchangeable (i.e. the lower wingspan included the fuselage width). It first introduced a mixed construction to Bartel's designs.
After trials, the prototype was modified in July 1930. The prototype was later redesignated BM.6a/II afther it was substantially modified. It offered quite good flight characteristics and was capable of aerobatic flight. It was demonstrated in a fighter-plane competition in Bucharest in 1930, along with the similar PZL P.1.
The second prototype BM-6b, with a Wright Whirlwind 220 hp radial engine, was ordered, but work upon it ceased with closure of the Samolot factory in mid-1930. The PWS works, which inherited many of Samolot's projects, did not continue the project, for it had its own similar design, the PWS-11.
[edit] Operational history
After state trials in 1931, the prototype was used in an advanced training school in Grudziądz, then in an aviation training center in Dęblin.
[edit] Operators
- Polish Air Force (single prototype)
[edit] Specifications (BM-6a)
[edit] Description
Mixed construction biplane. Steel framed fuselage, rectangular in cross-section, canvas covered (engine and upper sections - aluminum covered). Rectangular two-spar wings with rounded ends, plywood and canvas covered. Upper wing span: 7.36 m, lower wing span: 8.10 m. Lower and upper wing halves were interchangeable. Single pilot, sitting in open cockpit, with a windshield. The V8 engine Hispano-Suiza 8Be was modified to lower power output (from 220 hp to 180 hp). Radiator below the fuselage. Fixed landing gear, with a rear skid. Two-blade wooden propeller of fixed pitch. Fuel tank in fuselage: 168 l capacity.
General characteristics
- Crew: 1
- Length: 6.30 m ()
- Wingspan: 8.10 m ()
- Height: 2.76 m ()
- Wing area: 17.6 m² ()
- Empty weight: 697 kg ()
- Loaded weight: 985 kg ()
- Useful load: 288 kg ()
- Powerplant: 1× Hispano-Suiza 8Be (modified) V8 engine, water-cooled, 180 hp ()
Performance
- Maximum speed: 192 km/h
- Cruise speed: 165 km/h
- Stall speed: 85 km/h ()
- Range: 550 km ()
- Service ceiling 3,800 m ()
- Rate of climb: 4 m/s ()
- Wing loading: 56 kg/m² ()
Armament
- One 7.7 mm Vickers machine gun in a fuselage, with a synchronizing gear
[edit] References
- Andrzej Glass: "Polskie konstrukcje lotnicze 1893-1939" (Polish aviation constructions 1893-1939), WKiŁ, Warsaw 1977 (Polish language, no ISBN)
[edit] External links
- Photos and drawings at Ugolok Neba site (in Rusian)
[edit] See also
Comparable aircraft
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