Issoire Silène
| CE 75, E 78, and I 79 Silène | |
|---|---|
| Role | Sailplane |
| National origin | France |
| Manufacturer | Siren, CERVA, Issoire |
| First flight | 2 July 1974 |
| Number built | 6 by 1978 |
The Issoire Silène was a sailplane produced in France in the 1970s and early 1980s, intended primarily as a trainer. It was a conventional design of fibreglass construction in versions with fixed or retractable monowheel undercarriage. The aircraft featured side-by-side seating for two, with the seats slightly staggered in order to minimise fuselage width. French certification was obtained on 3 February 1978, and production began shortly thereafter at the rate of two aircraft per month.
The original CE 75 design was refined as the E 78, which featured a redesigned and roomier cockpit, and was again available in fixed and retractable undercarriage versions. A further development, the I 79, was in development in 1979, and featured tanks for water ballast as well as hydraulically operated flaps, undercarriage, and airbrakes.
Specifications (CE 75 Silène)[edit]
Data from Jane's all the World's Aircraft 1976–77[1]
General characteristics
- Crew: 2
- Length: 7.95 m (26 ft 1 in)
- Wingspan: 18 m (59 ft 1 in)
- Height: 1.5 m (4 ft 11 in)
- Wing area: 18 m2 (190 sq ft)
- Airfoil: Bertin E55-166 (16.6%)[2]
- Empty weight: 320 kg (705 lb)
- Max takeoff weight: 540 kg (1,190 lb)
Performance
- Stall speed: 63 km/h (39 mph, 34 kn) (single seat)
- 68 km/h (42 mph; 37 kn) (two seat with radio)
- 70.5 km/h (43.8 mph; 38.1 kn) (two seat with radio and oxygen equipment)
- Never exceed speed: 245 km/h (152 mph, 132 kn)
- Max aerotow speed: 164 km/h (102 mph; 89 kn)
- g limits: +5.3 (normal) ; +8 (ultimate)
- Maximum glide ratio: 36:1 at 84 km/h (52 mph; 45 kn) (single seat fixed mainwheel)
- 36 at 91.5 km/h (56.9 mph; 49.4 kn) (two seat with radio fixed mainwheel)
- 38 at 91.5 km/h (56.9 mph; 49.4 kn) (retractable mainwheel)
- Rate of sink: 0.59 m/s (116 ft/min) at 84 km/h (52 mph; 45 kn) (single seat)
- 0.64 m/s (2.1 ft/s) at 91.5 km/h (56.9 mph; 49.4 kn) (two seat with radio)
- 0.67 m/s (2.2 ft/s) at 91.5 km/h (56.9 mph; 49.4 kn) (two seat with radio and oxygen equipment)
- Wing loading: 31 kg/m2 (6.3 lb/sq ft) (max with oxygen equipment)
- 29 kg/m2 (5.9 lb/sq ft) (two seat with radio)
- 25 kg/m2 (5.1 lb/sq ft) (single seat)
References[edit]
- ^ Taylor, John W.R., ed. (1976). Jane's all the World's Aircraft 1976–77 (67th ed.). London: Jane's Yearbooks. ISBN 0-3540-0538-3.
- ^ Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.
Further reading[edit]
- Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. p. 535.
- Jane's All the World's Aircraft 1977-78. London: Jane's Yearbooks. pp. 581–82.
- Hardy, Michael (1982). Gliders and Sailplanes of the World. Shepperton: Ian Allan. p. 109.
- Coates, Andrew (1978). Jane's World Sailplanes and Motor Gliders. London: MacDonald and Jane's. p. 29.