Its high wing, mounted on top of the fuselage girder, was rectangular in plan and built around a single, wooden spar with plywood skin ahead of it, forming a torsion-resistant D-box, and fabric covering behind. The wing was braced to the bottom fuselage beam with a single strut on each side, assisted by drag wires from the nose. Narrow and very high aspect ratio ailerons were hung behind and below the whole trailing edge, leaving a slot between wing and aileron.[2][3][4]
The wing of the original production model, named Pionier, Lithuanian for Pioneer[2] (or Pionerius, the plural[3]) had a span of 7.58 m (24 ft 10 in) and an area of 10.5 m2 (113 sq ft).[3] The later Zylė (Tit), alternatively known as the LAK-2, had a slightly larger wing with a span of 7.80 m (25 ft 7 in) and an area of 11.8 m2 (127 sq ft), improving the glide ratio a little.[2][3]
The forward part of the fuselage was a wooden beam which extended aft to end under the wing trailing edge. At the nose there was a simple, semi-circular enclosure formed from two single-curvature surfaces. This gave the pilot, seated just under the leading edge, some protection from the wind, though not for his upper body or sides. The same beam was attached to the wing with an N-form cross-member and also carried the forward end of the horizontal upper fuselage member. The rear lower member ran upwards to meet the upper one at the tail. In addition, they were interconnected at mid-fuselage by a pair of vertical and diagonal struts. Immediately ahead of the tail the fuselage was fabric covered, though not elsewhere.[2][3][4]
Both variants had triangular tailplanes mounted on the upper frame with elevators which were rectangular in plan apart from a cut-out for rudder movement. Their little, triangular fins carried rather angular, quadrilateral rudders.[3][4]
The fuselages of the Pionier and Zylė differed only in their landing gear. The Pionier landed on the underside of the forward beam but the Zylė had a monowheel semi-recessed into its beam below the forward wing and a short nose skid.[2][3][4]
Operational historyedit
The BRO-11 Pionier was very widely used across the DOSAAF; some 2000 were built between about 1955 and 1960.[2] The date of the first flight of the Zile is not known exactly but was about 1968. Production began in mid-1969[2] and ended in 1979.[5] Production numbers for this variant are not known.
Variantsedit
BRO-11 Pionier(ius)
Original design, first flown in 1954 and some 2000 built in the later 1950s.
BRO-11M (LAK-2) Zylė
Larger wing and a landing wheel. Production by Lietuviškos Aviacinės Konstrukcijos (Lithuanian Aero-Construction, LAK) from 1969-79.
^Hardy, Michael (1982). Gliders & Sailplanes of the World. London: Ian Allan Ltd. p. 73-4. ISBN0-7110-1152-4.
^ abcdefghiTaylor, John W. R. (1984). Jane's All the World's Aircraft 1984-1985. London: Jane's Publishing Co. p. 644. ISBN0710608012.
^ abcdefg"Oškinis BrO-11 Pionierius". j2mc Planeurs. Retrieved 26 August 2019.
^ abcd"Oškinis BrO-11M Zylé". j2mc Planeurs. Retrieved 26 August 2019.
^Lambert, M. (1990). Jane's All the World's Aircraft 1990-1991. London: Jane's Information Group. p. 651. ISBN07106-0908-6.
^Ogden, Bob (2009). Aviation Museums and Collections of Mainland Europe. Air Britain (Historians) Ltd. p. 357. ISBN978-0-85130-418-2.
April 18, 2024
oškinis, primary, glider, designed, ussr, produced, large, numbers, from, 1950s, role, primary, glider, national, origin, ussr, designer, bronius, oškinis, first, flight, 1954, primary, user, dosaaf, number, built, over, 2000, contents, design, development, op. The Oskinis BRO 11 was a primary glider designed in the USSR It was produced in large numbers from the 1950s BRO 11 Role Primary glider National origin USSR Designer Bronius Oskinis First flight 1954 Primary user DOSAAF Number built Over 2000 Contents 1 Design and development 2 Operational history 3 Variants 4 Operators 5 Aircraft on display 6 Specifications BRO 11M Zyle 7 ReferencesDesign and development editThe Oskinis BRO 11 was a simple single seat primary glider in the open girder style exemplified by the pre war SG 38 Schulgleiter It was more refined with slotted ailerons and somewhat better protected seating 1 2 Its high wing mounted on top of the fuselage girder was rectangular in plan and built around a single wooden spar with plywood skin ahead of it forming a torsion resistant D box and fabric covering behind The wing was braced to the bottom fuselage beam with a single strut on each side assisted by drag wires from the nose Narrow and very high aspect ratio ailerons were hung behind and below the whole trailing edge leaving a slot between wing and aileron 2 3 4 The wing of the original production model named Pionier Lithuanian for Pioneer 2 or Pionerius the plural 3 had a span of 7 58 m 24 ft 10 in and an area of 10 5 m2 113 sq ft 3 The later Zyle Tit alternatively known as the LAK 2 had a slightly larger wing with a span of 7 80 m 25 ft 7 in and an area of 11 8 m2 127 sq ft improving the glide ratio a little 2 3 The forward part of the fuselage was a wooden beam which extended aft to end under the wing trailing edge At the nose there was a simple semi circular enclosure formed from two single curvature surfaces This gave the pilot seated just under the leading edge some protection from the wind though not for his upper body or sides The same beam was attached to the wing with an N form cross member and also carried the forward end of the horizontal upper fuselage member The rear lower member ran upwards to meet the upper one at the tail In addition they were interconnected at mid fuselage by a pair of vertical and diagonal struts Immediately ahead of the tail the fuselage was fabric covered though not elsewhere 2 3 4 Both variants had triangular tailplanes mounted on the upper frame with elevators which were rectangular in plan apart from a cut out for rudder movement Their little triangular fins carried rather angular quadrilateral rudders 3 4 The fuselages of the Pionier and Zyle differed only in their landing gear The Pionier landed on the underside of the forward beam but the Zyle had a monowheel semi recessed into its beam below the forward wing and a short nose skid 2 3 4 Operational history editThe BRO 11 Pionier was very widely used across the DOSAAF some 2000 were built between about 1955 and 1960 2 The date of the first flight of the Zile is not known exactly but was about 1968 Production began in mid 1969 2 and ended in 1979 5 Production numbers for this variant are not known Variants editBRO 11 Pionier ius Original design first flown in 1954 and some 2000 built in the later 1950s BRO 11M LAK 2 Zyle Larger wing and a landing wheel Production by Lietuviskos Aviacines Konstrukcijos Lithuanian Aero Construction LAK from 1969 79 Operators editDOSAAFAircraft on display editBRO 11M Zyle Lithuanian Aviation Museum Kaunas Lithuania 6 Specifications BRO 11M Zyle editData from Jane s All the World s Aircraft 1984 5 2 General characteristicsCrew One Length 5 16 m 16 ft 11 in Wingspan 7 80 m 25 ft 7 in Height 2 50 m 8 ft 2 in Wing area 11 80 m2 127 0 sq ft Aspect ratio 5 05 Empty weight 65 kg 143 lb Max takeoff weight 125 kg 276 lb Performance Stall speed 31 km h 19 mph 17 kn Maximum glide ratio 12 Rate of sink 1 0 m s 200 ft min minimumReferences edit Hardy Michael 1982 Gliders amp Sailplanes of the World London Ian Allan Ltd p 73 4 ISBN 0 7110 1152 4 a b c d e f g h i Taylor John W R 1984 Jane s All the World s Aircraft 1984 1985 London Jane s Publishing Co p 644 ISBN 0710608012 a b c d e f g Oskinis BrO 11 Pionierius j2mc Planeurs Retrieved 26 August 2019 a b c d Oskinis BrO 11M Zyle j2mc Planeurs Retrieved 26 August 2019 Lambert M 1990 Jane s All the World s Aircraft 1990 1991 London Jane s Information Group p 651 ISBN 07106 0908 6 Ogden Bob 2009 Aviation Museums and Collections of Mainland Europe Air Britain Historians Ltd p 357 ISBN 978 0 85130 418 2 Retrieved from https en wikipedia org w index php title Oskinis BRO 11 amp oldid 1088181829, wikipedia, wiki, book, books, library,
