The PZL.49 Miś (English: Little Bear) was a Polish twin-engined medium bomber design that remained only a project due to the outbreak of World War II. The PZL.49 was based on the contemporary PZL.37 Łoś and was to replace it at production lines at the PZL works.
PZL.49 Miś
Possibly a side drawing from one of the few surviving pieces of documentation on this design.
The PZL.49 was a development of the advanced, "state-of-the-art"[1]medium bomberPZL.37 Łoś, designed by Jerzy Dąbrowski, Stanisław Kot and Piotr Kubicki.[2] About 50% of its design elements were taken from PZL.37 Łoś bomber to simplify the design process. The main target for the design team was to increase performance, especially flight speed, by means of installing more powerful engines and improving aerodynamics. Its standard 2,200 kg (4,900 lb) bomb load could be increased to 3,000 kg (6,600 lb) by decreasing its fuel load. Its standard 2,200 km (1,200 nmi) range could be increased to 3,000 km (1,900 nmi) with additional fuel tanks.
Detailed project was ready in mid-1938 and a report by General Józef Zając from 28 November 1938 stated that all drawings were complete. Design process was slow due to the simultaneous involvement of PZL construction bureau in development of the PZL.50 Jastrząb fighter. During the summer of 1939, a mock-up of the PZL.49 was approved by the Air Force and project could be continued. Due to the engagement of Jerzy Dąbrowski in PZL.62 development, Piotr Kubicki became the leader of the PZL.49 design team.
In late 1938 or early 1939 production of parts for two prototypes begun in Wytwórnia Płatowców nr 1 of PZL factory (PZL WP-2). In early 1939 a full-scale mock-up of fuselage with part of the left wing was built for testing placement of cockpit and fuselage equipment.
Serial production was planned to take place in the PZL WP-2 factory in Mielec as well as construction bureau HQ. A development schedule from August 1939 set the first flight of PZL.49/I in the summer of 1940, with the first serial built aircraft being delivered to combat units in late 1941 or early 1942. However, due to the German invasion on 1 September 1939, all plans were canceled. All documentation of the PZL.49 project was moved to Jerzy Dąbrowski's apartment in Warsaw early September 1939 and in late September, during siege of Warsaw, was burned in a nearby bakery to avoid German capture. Very little of the documentation has been recovered since the war.[2]
Technical designedit
The aircraft was conventional in layout, all metal (including the skin), with low-set laminar-flow wings and a twin tail. In terms of size, it was slightly larger than the Lockheed Model 10 Electra that Amelia Earhart used and was comparable to its predecessor, the PZL.37 Łoś. The crew consisted of four: pilot, commander/bombardier, radio operator and a rear gunner. The bombardier was accommodated in the glazed nose, with two forward-firing 7.92 mm PWU wz.37 machine guns. The radio operator sat inside the fuselage, above the bomb bay. The radio operator also operated two rear-firing 7.92 mm PWU wz.37 machine guns fitted in a kołyska (Polish: bassinet, typically called a gondola in English). The rear gunner sat in a fuselage turret with a 20mm cannon or four 7.92 mm PWU wz.37 machine guns.
The main undercarriage retracted into the engine nacelles. The undercarriage was double-wheeled, with an independent suspension for each wheel and retractable rear wheel. The plane was powered by two Bristol Herculesradial engines with NACA covers. The bombs were carried in a two-section bomb bay in the fuselage, as well as bomb bays in the central section of the wings. The maximum load was 3,000 kg. Wings were fitted with split flaps.
Variants (planned)edit
PZL.49/I
First prototype for flight and static trials.
PZL.49/II
Second prototype, pattern aircraft for PZL.49A version.
^Lukowski, Jerzy; Zawadzki, Hubert (2001). A concise history of Poland. Cambridge University Press. p. xi. ISBN0-521-55917-0.
^ abc. samoloty.ow. Archived from the original on 16 December 2008. Retrieved 21 May 2019.
Further readingedit
Wikimedia Commons has media related to PZL.49 Miś.
Glass, Andrzej (1977). Polskie konstrukcje lotnicze 1893-1939" (Polish aviation constructions 1893-1939). Warsaw: WKiŁ.
April 11, 2024
miś, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, november, 2008, learn,. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources PZL 49 Mis news newspapers books scholar JSTOR November 2008 Learn how and when to remove this template message The PZL 49 Mis English Little Bear was a Polish twin engined medium bomber design that remained only a project due to the outbreak of World War II The PZL 49 was based on the contemporary PZL 37 Los and was to replace it at production lines at the PZL works PZL 49 MisPossibly a side drawing from one of the few surviving pieces of documentation on this design Role BomberManufacturer PZLPrimary user Polish Air Force planned Number built Incomplete prototypeDeveloped from PZL 37 Los Contents 1 Design 2 Technical design 3 Variants planned 4 Operators planned 5 Specification PZL 49 estimated 6 See also 7 References 8 Further readingDesign editThe PZL 49 was a development of the advanced state of the art 1 medium bomber PZL 37 Los designed by Jerzy Dabrowski Stanislaw Kot and Piotr Kubicki 2 About 50 of its design elements were taken from PZL 37 Los bomber to simplify the design process The main target for the design team was to increase performance especially flight speed by means of installing more powerful engines and improving aerodynamics Its standard 2 200 kg 4 900 lb bomb load could be increased to 3 000 kg 6 600 lb by decreasing its fuel load Its standard 2 200 km 1 200 nmi range could be increased to 3 000 km 1 900 nmi with additional fuel tanks Detailed project was ready in mid 1938 and a report by General Jozef Zajac from 28 November 1938 stated that all drawings were complete Design process was slow due to the simultaneous involvement of PZL construction bureau in development of the PZL 50 Jastrzab fighter During the summer of 1939 a mock up of the PZL 49 was approved by the Air Force and project could be continued Due to the engagement of Jerzy Dabrowski in PZL 62 development Piotr Kubicki became the leader of the PZL 49 design team In late 1938 or early 1939 production of parts for two prototypes begun in Wytwornia Platowcow nr 1 of PZL factory PZL WP 2 In early 1939 a full scale mock up of fuselage with part of the left wing was built for testing placement of cockpit and fuselage equipment Serial production was planned to take place in the PZL WP 2 factory in Mielec as well as construction bureau HQ A development schedule from August 1939 set the first flight of PZL 49 I in the summer of 1940 with the first serial built aircraft being delivered to combat units in late 1941 or early 1942 However due to the German invasion on 1 September 1939 all plans were canceled All documentation of the PZL 49 project was moved to Jerzy Dabrowski s apartment in Warsaw early September 1939 and in late September during siege of Warsaw was burned in a nearby bakery to avoid German capture Very little of the documentation has been recovered since the war 2 Technical design editThe aircraft was conventional in layout all metal including the skin with low set laminar flow wings and a twin tail In terms of size it was slightly larger than the Lockheed Model 10 Electra that Amelia Earhart used and was comparable to its predecessor the PZL 37 Los The crew consisted of four pilot commander bombardier radio operator and a rear gunner The bombardier was accommodated in the glazed nose with two forward firing 7 92 mm PWU wz 37 machine guns The radio operator sat inside the fuselage above the bomb bay The radio operator also operated two rear firing 7 92 mm PWU wz 37 machine guns fitted in a kolyska Polish bassinet typically called a gondola in English The rear gunner sat in a fuselage turret with a 20mm cannon or four 7 92 mm PWU wz 37 machine guns The main undercarriage retracted into the engine nacelles The undercarriage was double wheeled with an independent suspension for each wheel and retractable rear wheel The plane was powered by two Bristol Hercules radial engines with NACA covers The bombs were carried in a two section bomb bay in the fuselage as well as bomb bays in the central section of the wings The maximum load was 3 000 kg Wings were fitted with split flaps Variants planned editPZL 49 I First prototype for flight and static trials PZL 49 II Second prototype pattern aircraft for PZL 49A version PZL 49A Version powered by PZL Bristol Hercules III engines PZL 49B Export version with French Gnome Rhone 14N 50 51 engines Operators planned edit nbsp PolandPolish Air Force Brygada BombowaSpecification PZL 49 estimated editData from Samoloty PZL 49 Bear 2 General characteristicsCrew 4 Length 14 5 m 47 ft 7 in Wingspan 18 m 59 ft 1 in Height 4 8 m 15 ft 9 in Wing area 55 m2 590 sq ft Empty weight 6 500 kg 14 330 lb Max takeoff weight 11 500 kg 25 353 lb Powerplant 2 PZL Bristol Hercules III 14 cylinder air cooled sleeve valve radial piston engines 1 005 kW 1 348 hp each to 1 050 kW 1 410 hp for take off 829 862 kW 1 112 1 156 hp nominal rating Propellers 3 bladed de Havilland or PZL Hamilton Standard adjustable variable pitch propellersPerformance Maximum speed 520 km h 320 mph 280 kn Range 2 000 km 1 200 mi 1 100 nmi Ferry range 3 000 km 1 900 mi 1 600 nmi Wing loading 209 9 kg m2 43 0 lb sq ft Power mass 0 1825 kW kg 0 1110 hp lb Armament Guns 2 7 92 mm 0 312 in PWU wz 37 machine guns in nose 2 7 92 mm 0 312 in PWU wz 37 machine guns mounted in ventral position 1 20 mm 0 787 in Oerlikon FF S or FK wz 38D cannon or 4 7 92 mm 0 312 in PWU wz 37 machine guns in dorsal turret Bombs 3 000 kg 6 600 lb of bombsSee also editRelated development PZL 37 LosAircraft of comparable role configuration and era Handley Page Hampden Heinkel He 111 Dornier Do 17 Ilyushin DB 3 Ilyushin Il 4 Mitsubishi G4M Nakajima Ki 49References edit Lukowski Jerzy Zawadzki Hubert 2001 A concise history of Poland Cambridge University Press p xi ISBN 0 521 55917 0 a b c PZL 49 Bear samoloty ow Archived from the original on 16 December 2008 Retrieved 21 May 2019 Further reading edit nbsp Wikimedia Commons has media related to PZL 49 Mis Glass Andrzej 1977 Polskie konstrukcje lotnicze 1893 1939 Polish aviation constructions 1893 1939 Warsaw WKiL Retrieved from https en wikipedia org w index php title PZL 49 Mis amp oldid 1192073710, wikipedia, wiki, book, books, library,
