Schneider ES-52

The Schneider ES-52 Kookaburra is an Australian two-seat training sailplane of the 1950s and 1960s. It was designed by Edmund Schneider, the designer of the Grunau Baby, who had emigrated to Adelaide, South Australia following the end of the Second World War.[1]

ES-52 Kookaburra
Role Two-seat sailplane
National origin Australia
Manufacturer Edmund Schneider Pty Australia
Designer Edmund Schneider
First flight 20 June 1954
Number built 44
External image
image icon Schneider ES-52B “Kookaburra”

The Kookaburra is a cantilever high-winged monoplane of wooden construction, with staggered side-by-side seating under a perspex canopy. The first example flew on 20 June 1954. It was available in both short and long wingspan versions and was widely used by Australian gliding clubs in the 1960s.[1]


Variants
ES-52 Mk.I
Initial production, 4 built.[1]
ES-52 Mk.II
Eleven built.[1]
ES-52 Mk.III
Eight built.[1]
ES-52 Mk.IV
17 built by 1964.[1]
ES-52B
A 14.86 m (48 ft 9 in) span version of the Kookaburra with a completely revised three piece wing. Four aircraft built.[2]

Specifications (ES 52 Mk.IV)

Data from The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II[2]

General characteristics

  • Crew: 2
  • Length: 7.90 m (25 ft 11 in)
  • Wingspan: 11.70 m (38 ft 5 in)
  • Height: 1.48 m (4 ft 10 in)
  • Wing area: 15.0 m2 (161 sq ft)
  • Aspect ratio: 9.13
  • Airfoil: Root: Go 549, Tip: M-12
  • Empty weight: 220 kg (485 lb)
  • Gross weight: 393 kg (866 lb)

Performance

  • Stall speed: 61 km/h (38 mph, 33 kn)
  • Never exceed speed: 220 km/h (140 mph, 120 kn)
  • Rough air speed max: 151 km/h (94 mph; 82 kn)
  • Aerotow speed: 113 km/h (70 mph; 61 kn)
  • Winch launch speed: 113 km/h (70 mph; 61 kn)
  • Terminal velocity: with full air-brakes at max all-up weight 208 km/h (129 mph; 112 kn)
  • g limits:
+5 -2.5 at 142 km/h (76.7 kn), +4 -0 at 300 km/h (186.4 mph; 162.0 kn)
  • Maximum glide ratio: 20:1 at 50.3 mph; 43.7 kn (81 km/h)
  • Rate of sink: 1.05 m/s (207 ft/min) at 44.7 mph; 38.9 kn (72 km/h)
  • Wing loading: 26.2 kg/m2 (5.4 lb/sq ft) (ES-52 Mk.IV)

Notes
  1. Taylor, John W. R. (1965). Jane's All The World's Aircraft 1965-66. London: Sampson Low, Marston & Company. pp. 359–360.
  2. Shenstone, B.S.; K.G. Wilkinson (1963). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II (in English, French, and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 20–24.

See also

References
  • Taylor, John W. R. (1965). Jane's All The World's Aircraft 1965-66. London: Sampson Low, Marston & Company. pp. 359–360.
  • Shenstone, B.S.; K.G. Wilkinson (1963). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II (in English, French, and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 20–24.
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