Schneider ES-52

ES-52 Kookaburra
Role	Two-seat sailplane
National origin	Australia
Manufacturer	Edmund Schneider Ltd
Designer	Edmund Schneider
First flight	20 June 1954
Number built	44

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]

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 / ES-52B)

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) (ES-52 Mk.IV)

14.86 m (48 ft 9 in) (ES-52B)

Height: 1.48 m (4 ft 10 in)
Wing area: 15.0 m² (161 sq ft) (ES-52 Mk.IV)

19.3 m² (208 sq ft) (ES-52B)

Aspect ratio: 9.13 (ES-52 Mk IV)

11.4 (ES-52B)

Airfoil: root: Go 549, tip M-12
Empty weight: 220 kg (485 lb) (ES-52 Mk.IV)

287 kg (633 lb) (ES-52B)

Gross weight: 393 kg (866 lb) (ES-52 Mk.IV)

500 kg (1,102 lb) (ES-52B)

Performance

Stall speed: 61 km/h (38 mph; 33 kn) (ES-52 Mk.IV)

59 km/h (37 mph; 32 kn) (ES-52B)

Never exceed speed: 220 km/h (137 mph; 119 kn) (ES-52 Mk.IV)

194 km/h (121 mph; 105 kn) (ES-52B)

Rough air speed max: 151 km/h (94 mph; 82 kn) (ES-52 Mk.IV)

145 km/h (90 mph; 78 kn) (ES-52B)

Aerotow speed: 113 km/h (70 mph; 61 kn)
Winch launch speed: 113 km/h (70 mph; 61 kn) (ES-52 Mk.IV)

105 km/h (65 mph; 57 kn) (ES-52B)

Terminal velocity: with full air-brakes at max all-up weight 208 km/h (129 mph; 112 kn) (ES-52 Mk.IV)

194 km/h (121 mph; 105 kn) (ES-52B)

g limits:

+5 -2.5 at 142 km/h (76.7 kn), +4 -0 at 300 km/h (186.4 mph; 162.0 kn) (ES-52 Mk.IV)

+5 -2.5 at 137 km/h (74.0 kn), +4 -0 at 293 km/h (182.1 mph; 158.2 kn) (ES-52B)

Maximum glide ratio: 20:1 at 50.3 mph; 43.7 kn (81 km/h) (ES-52 Mk.IV)

24:1 at 84 km/h (52 mph; 45 kn) (ES-52B)

Rate of sink: 1.05 m/s (207 ft/min) at 44.7 mph; 38.9 kn (72 km/h) (ES-52 Mk IV)

0.83 m/s (163.4 ft/min) at 68 km/h (42 mph; 37 kn) (ES-52B)

Wing loading: 26.2 kg/m² (5.4 lb/sq ft) (ES-52 Mk.IV)

25.9 kg/m² (5.305 lb/sqft) (ES-52B)

Notes

1 2 3 4 5 6 Taylor, John W. R. (1965). Jane's All The World's Aircraft 1965-66. London: Sampson Low, Marston & Company. pp. 359–360.
1 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.

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.

External links

MK IV Kookaburra - VH-GNZ.

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