The aircraft was designed by Ryszard Bartel, a chief designer of Samolot factory in Poznań. It was the first Polish design of a trainer plane. Initially it was known as Bartel M.2, then BM 2 (M was for designer's wife Maryla). The prototype was flown on 7 December 1926 in Poznań. In June 1927 it was shown at the first Aviation Exhibition in Warsaw. It was tested in 1927 and evaluated as quite good, but it was not built in series, because Bartel decided to design an improved aircraft, which resulted in the Bartel BM 4 trainer, which was produced in quantity. After flight testing, the prototype was removed from service.[1]
A distinguishing feature of the BM 2 and all Bartels was an upper wing of a shorter span, because the lower and upper wing halves were interchangeable (i.e. the lower wingspan included the width of the fuselage). Also Bartel put a stress on standardizing the construction materials used: steel pipes, metal sheet etc., in order to make production and repairs easier. A distinguishing feature of the BM 2 was the upper wing directly over the lower wing - unstaggered wings, while in later Bartel designs, the wings incorporate forward stagger - where the upper wing is mounted ahead of the lower wing.
Descriptionedit
Wooden construction biplane, conventional in layout. Fuselage rectangular in cross-section, plywood-covered (engine section - metal covered). Rectangular two-spar wings, plywood- and canvas-covered. Crew of two, sitting in tandem in open cockpits, with individual windshields. Cockpits with twin controls, the instructor seated aft. Fixed landing gear, with a rear skid (main gear with a common axle, sprung with a rubber rope). Radial engine in the fuselage nose, without a cowling.[1]
Specificationsedit
Bartel M.2 3-view drawing from Les Ailes March 17, 1927
Data from Jane's all the World's Aircraft 1928,[2] Polish Aircraft 1893–1939[1]
^ abcCynk, Jerzy B. (1971). Polish Aircraft 1893–1939. London: Putnam. pp. 354-356. ISBN978-0-370-00085-5.
^Grey, C.G., ed. (1928). Jane's all the World's Aircraft 1928. London: Sampson Low, Marston & company, ltd. pp. 180c–181c.
Bibliographyedit
Nelcarz, Bartolomiej & Peczkowski, Robert (2001). White Eagles: The Aircraft, Men and Operations of the Polish Air Force 1918–1939. Ottringham, UK: Hikoki Publications. ISBN1-902109-73-2.
External linksedit
Wikimedia Commons has media related to Bartel BM-2.
Photo and drawings
Ugolok Neba site (in Russian)
January 01, 1970
bartel, originally, bartel, polish, biplane, primary, trainer, aircraft, prototype, 1926, role, primary, trainer, aircraft, manufacturer, samolot, designer, ryszard, bartel, first, flight, december, 1926, status, prototype, number, built, contents, design, dev. The Bartel BM 2 originally Bartel M 2 was a Polish biplane primary trainer aircraft prototype of 1926 Bartel BM 2 Role Primary trainer aircraft Manufacturer Samolot Designer Ryszard Bartel First flight 7 December 1926 Status Prototype Number built 1 Contents 1 Design and development 1 1 Description 2 Specifications 3 See also 4 References 5 Bibliography 6 External linksDesign and development editThe aircraft was designed by Ryszard Bartel a chief designer of Samolot factory in Poznan It was the first Polish design of a trainer plane Initially it was known as Bartel M 2 then BM 2 M was for designer s wife Maryla The prototype was flown on 7 December 1926 in Poznan In June 1927 it was shown at the first Aviation Exhibition in Warsaw It was tested in 1927 and evaluated as quite good but it was not built in series because Bartel decided to design an improved aircraft which resulted in the Bartel BM 4 trainer which was produced in quantity After flight testing the prototype was removed from service 1 A distinguishing feature of the BM 2 and all Bartels was an upper wing of a shorter span because the lower and upper wing halves were interchangeable i e the lower wingspan included the width of the fuselage Also Bartel put a stress on standardizing the construction materials used steel pipes metal sheet etc in order to make production and repairs easier A distinguishing feature of the BM 2 was the upper wing directly over the lower wing unstaggered wings while in later Bartel designs the wings incorporate forward stagger where the upper wing is mounted ahead of the lower wing Description edit Wooden construction biplane conventional in layout Fuselage rectangular in cross section plywood covered engine section metal covered Rectangular two spar wings plywood and canvas covered Crew of two sitting in tandem in open cockpits with individual windshields Cockpits with twin controls the instructor seated aft Fixed landing gear with a rear skid main gear with a common axle sprung with a rubber rope Radial engine in the fuselage nose without a cowling 1 Specifications edit nbsp Bartel M 2 3 view drawing from Les Ailes March 17 1927 Data from Jane s all the World s Aircraft 1928 2 Polish Aircraft 1893 1939 1 General characteristicsCrew 2 Length 7 8 m 25 ft 7 in Wingspan 11 77 m 38 ft 7 in Height 3 08 m 10 ft 1 in Wing area 28 6 m2 308 sq ft Aspect ratio 8 5 Airfoil Bartel 37 IIa Empty weight 695 kg 1 532 lb Gross weight 970 kg 2 138 lb Fuel capacity 130 L 34 US gal 29 imp gal in two centre section tanks 16 L 4 2 US gal 3 5 imp gal oil Powerplant 1 Salmson 9AC 9 cylinder air cooled radial piston engine 89 kW 120 hp Propellers 2 bladed wooden fixed pitch propeller 2 24 m 7 ft 4 in diameter Performance Maximum speed 130 km h 81 mph 70 kn Landing speed 65 km h 40 mph 35 kn Cruise speed 100 km h 62 mph 54 kn Stall speed 65 km h 40 mph 35 kn Range 320 km 200 mi 170 nmi Service ceiling 4 000 m 13 000 ft Rate of climb 2 9 m s 570 ft min Time to altitude 1 000 m 3 300 ft in 7 minutes Wing loading 33 8 kg m2 6 9 lb sq ft Power mass 0 092 kW kg 0 056 hp lb Fuel consumption 34 L h 9 0 gal h 7 5 imp gal h See also editRelated development Bartel BM 4 Bartel BM 5References edit a b c Cynk Jerzy B 1971 Polish Aircraft 1893 1939 London Putnam pp 354 356 ISBN 978 0 370 00085 5 Grey C G ed 1928 Jane s all the World s Aircraft 1928 London Sampson Low Marston amp company ltd pp 180c 181c Bibliography editNelcarz Bartolomiej amp Peczkowski Robert 2001 White Eagles The Aircraft Men and Operations of the Polish Air Force 1918 1939 Ottringham UK Hikoki Publications ISBN 1 902109 73 2 External links edit nbsp Wikimedia Commons has media related to Bartel BM 2 Photo and drawings Ugolok Neba site in Russian Retrieved from https en wikipedia org w index php title Bartel BM 2 amp oldid 1126576660, wikipedia, wiki, book, books, library,
