Archive digitization



Aviation and Diplomacy

Frank Piasecki

NATO 1949-2009 Projekt ekspozycji w Muzeum Lotnictwa Polskiego w Krakowie



Polish Aviation Museum

31-864 Kraków,
al. Jana Pawła II 39
phone: (12) 640 99 60,
(12) 642 40 70
e-mail: info@muzeumlotnictwa.pl

a cultural institution of the Malopolska Region

Małopolska – Kraków Region


Patronage

Kraków Airport







Glider: SZD-21 Kobuz 3

SZD-21 Kobuz 3
Poland
aerobatic glider



  • Technical data


Span 14.0 m (45 ft 11 in)
Length 7.2 m (23 ft 7 in)
Wing area 13.5 sq m (145 sq ft)
Empty weight 311 kg (686 lb)
Take-off weight 401 kg (884 lb)
Glide ratio 30.5 at 100 kph (62 mph, 54 kt) optimum speed
Sink rate 0.9 mps (3 fps) at 100 kph (62 mph, 54 kt) economy speed
Minimum speed 73 kph (45 mph, 39 kt)
Max. diving speed 350 kph (217 mph, 189 kt)

 

A single seater aerobatic glider of wooden construction, bearing a cantilever mid-wing configuration.

Works on a new aerobatic glider to succeed the well-known Jastrząb (hawk) was begun in 1958. The design team was led by engineer Jerzy Trzeciak. Wings of a laminar aerofoil section were equipped with divided and slotted ailerons and air brakes.

The first prototype of the new glider designated the SZD-21-2 Kobuz (hobby) was flown in June 1961 by the test pilot Stanisław Skrzydlewski. In-flight tests showed that diagonal stability was insufficient for an aerobatic glider. Subsequent improvements failed to bring results as requested. In April 1963, during tests of the SZD-21 Kobuz 2A, a factory test pilot, engineer Sławomir Makaruk was killed. It was not until December 1964 that a successful SZD-21B Kobuz 3 prototype was flown. It was designed by engineers: Jerzy Trzeciak and Marian Gracz.

In total 32 examples of the Kobuz 3 gliders were produced. They served in aeroclubs until the mid-1980s, setting many significant records in aerobatics. The end the glider's career came after an accident, when a Kobuz decomposed in flight, due to the fatigue of glued together parts.

The exhibit on display enriched the museum's collection in 1983.

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Dofinansowano ze środków Ministra Kultury i Dziedzictwa Narodowego
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