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The Cywiński Lublin I and II were very similar Polish gliders, designed and built for the 1923 First Polish Glider Contest.

Lublin
Role	Single seat glider
National origin	Poland
Manufacturer	Plage i Laśkiewicz, Lublin, Poland
Designer	Stanisław Cywiński
First flight	29 August 1923
Number built	2

Design and development

Reports of the first German glider contest, held at the Wasserkuppe in the late summer of 1920, generated considerable interest in Poland, leading to the First Polish Glider Contest at Czarna Góra between 30 August and 13 September 1923. The contest was not a great success, limited by novice designers and pilots and a poor site, but the Karpiński SL.1 Akar was by far the most successful entrant.[1]

The Lublin was designed by Stanisław Cywiński and two examples, designated Lublin I and Lublin II, were built in the Lublin works of Plage i Laśkiewicz. The only differences between the two were in their ailerons.[1]

The Lublin was an aerodynamically clean, wooden, high wing monoplane. Its one-piece wing had two spars, a trapezoidal plan and fabric covering. The fuselage had a rectangular section and in profile resembled a thick airfoil. It was covered with dural sheet forward and fabric aft and included an open, single-seat cockpit. At the rear the rudder and fin together were strongly swept back and roughly rhomboidal in shape. An all-moving tailplane was mounted on the extreme fuselage.[1][2]

Like most of the gliders at the contest, the Lublin had wheeled landing gear and a tailskid. The main wheels were mounted close to the fuselage underside on a single axle carried, via rubber-cord shock absorbers, by short V-struts.[1]

Each Lublin made only one flight, both piloted by Franciszek Rutkowski and ending in a crash. On 28 August 1923 the Lublin I managed a flight of only 10 seconds and on 6 September the Lublin II lasted 60 seconds. The latter was enough to earn the Plage i Laśkiewicz concern fourth prize, behind the two Akars and the Kubicki Ikub I.[2]

Specifications

Data from J. Cynk, 1971[1] except where noted

General characteristics

• Crew: One
• Length: 6.5 m (21 ft 4 in) [2]
• Wingspan: 12.5 m (41 ft 0 in)
• Height: 1.4 m (4 ft 7 in)
• Wing area: 17 m² (180 sq ft) [2]
• Aspect ratio: 9.2
• Empty weight: 125 kg (276 lb)
• Gross weight: 200 kg (441 lb)

References

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