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The SZD-9 Bocian (Stork) is a Polish two-seat glider developed by SZD (Szybowcowy Zakład Doświadczalny, Glider Experimental Works).

History Edit

The SZD-9 was designed by Marian Wasilewski, Roman Zatwarnicki and Justyn Sandauer. The prototype made its first flight on 10 March 1952 and production began in early 1953 after minor modifications. 617 Bocians were built until 1977.

The SZD-9 was advanced for its time, and unlike most two-seat gliders, it was fit for competition flying and aerobatics, in addition to training. Several world records were set with the SZD-9.

Variants Edit

  • SZD-9 Bocian - two prototypes.
  • SZD-9bis Bocian-1A - initial production variant, 11 built.
  • SZD-9bis Bocian-1B - larger tailfin, 11 built.
  • SZD-9bis Bocian-1C - wings swept at lesser angle, modified control surfaces and rear skid, 40 built.
  • SZD-9bis Bocian-Z - competition variant for 1956 World Gliding Competition, 3 built (2 modified from Bocian Cs).
  • SZD-9bis Bocian-1D - larger wheel and minor modifications, 186 built.
  • SZD-9bis Bocian-1E - straight wing tips, two-part canopy instead of three-part, landing gear with shock absorbers, 366 built.
  • SZD-33 Bocian 3 - improved trainer version, cancelled in favor of the Bocian-1E.

Specifications Edit

  • Crew: 2
  • Length: 8.2 m (26 ft 11 in)
  • Wingspan: 18.1 m (59 ft 5 in)
  • Height: 1.8 m (5 ft 11 in)
  • Wing area: 20 m2 (220 sq ft)
  • Aspect ratio: 16.2
  • Airfoil: root: NACA 43018A; tip: NACA 43012A
  • Empty weight: 330 kg (728 lb)
  • Max takeoff weight: 525 kg (1,157 lb)
  • Stall speed: 52 km/h (32 mph, 28 kn)
  • Never exceed speed: 200 km/h (120 mph, 110 kn)
  • Max aerotow speed: 140 km/h (87 mph; 76 kn)
  • Max winch launch speed: 115 km/h (71 mph; 62 kn)
  • g limits: (ultimate)
    +10.5 at 138 km/h (86 mph; 75 kn)
    +5.25 at 250 km/h (160 mph; 130 kn)
    0 at 250 km/h (160 mph; 130 kn)
    -2.62 at 250 km/h (160 mph; 130 kn)
  • Maximum glide ratio: 26 at 84 km/h (52 mph; 45 kn)
  • Rate of sink: 0.8 m/s (160 ft/min) at 71 km/h (44 mph; 38 kn)
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