IIL IS-11

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IS-11
Role Single seat
aerobatic glider
National origin Romania
Manufacturer Întreprinderea de industrie Locală (IIL)
Designer Iosif Șilimon
First flight 16 December 1959
Number built small number

The IIL IS-11 was an

aerobatic, single seat glider, designed and built in Romania
in 1959. It was built in small numbers.

Design and development

From about 1950 to his death in February 1981, Iosif Silimon was Romania's most prominent glider designer, his aircraft distinguished by his initials.

sailplane.[2]

The

chord just inboard of the ailerons. The wing tips carried the small, streamlined bodies known as salmons, common at the time.[3]

The fuselage of the IS-11 was an oval section plywood

elevators. These were balanced by a bob weight within the fuselage and had gaps both at their roots to clear the fin and at their tips to clear rearward tailplane extensions, with a small central cut out for rudder movement. There was a trim tab on the starboard elevator and a tail bumper under the rudder hinge.[3]

The IS-11 was first flown on 16 December 1959 and a few more were built during 1961.[2]

Specifications

Data from Sailplanes of the World, pp.204-5[3]

General characteristics

  • Crew: One
  • Length: 6.86 m (22 ft 6 in)
  • Wingspan: 14.1 m (46 ft 3 in)
  • Height: 1.60 m (5 ft 3 in) [2]
  • Wing area: 14.5 m2 (156 sq ft)
  • Aspect ratio: 13.75
  • Airfoil: NACA 23015 root, 23012 from mid span outwards
  • Empty weight: 240 kg (529 lb)
  • Gross weight: 330 kg (728 lb)

Performance

  • Stall speed: 60 km/h (37 mph, 32 kn)
  • Never exceed speed: 275 km/h (171 mph, 148 kn) placard, in smooth air
  • Rough air speed max: 160 km/h (99 mph; 86 kn)
  • Aerotow speed: 150 km/h (93 mph; 81 kn)
  • Winch launch speed: 100 km/h (62 mph; 54 kn)
  • g limits: +6/-4
  • Maximum glide ratio: best 24 at 80 km/h (50 mph; 43 kn)
  • Rate of sink: 0.82 m/s (161 ft/min) minimum, at 68 km/h (42 mph; 37 kn)
  • Wing loading: 23.8 kg/m2 (4.9 lb/sq ft)


References

  1. ISBN 0710607059
    .
  2. ^ a b c d Taylor, John W R (1964). Jane's All the World's Aircraft 1964-65. London: Sampson Low, Marston & Co. Ltd. p. 372.
  3. ^ a b c d Shenstone, B.S.; Wilkinson, K.G. (1963). The World's Sailplanes. Vol. II. Organisation Scientifique et Technique Internationale du Vol à Voile (OSTIV) and Schweizer Aero-Revue. pp. 204–5.
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