IIL IS-11

Last updated
IS-11
RoleSingle seat aerobatic glider
National origin Romania
ManufacturerÎntreprinderea de industrie Locală (IIL)
Designer Iosif Șilimon
First flight16 December 1959
Number builtsmall number

The IIL IS-11 was an aerobatic, single seat glider, designed and built in Romania in 1959. It was built in small numbers.

Contents

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. [1] His single seat IS-11 was a wooden, high wing aerobatic sailplane. [2]

The cantilever high wing of the IS-11 was mounted with a dihedral of 2.5°. It was built around a single spar with a plywood covered torsion box ahead of it around the leading edge. The rest of the wing was also ply covered. In plan the wing was symmetrically straight tapered. Its mass balanced ailerons were slotted and fabric over ply covered. The IS-11 had short span spoilers, opening both above and below the wing, mounted at mid-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 monocoque. [3] The pilot sat in a semi-reclining position in a single seat cockpit under a single piece, side opening perspex canopy [2] which, with a short, fixed transparency behind it stretched from the nose into the leading edge of the wing. Its undercarriage comprised a very short, rubber sprung skid under the nose and a fixed, unsprung monowheel semi-recessed into the fuselage under the forward wing and fitted with a brake. From the high wing the fuselage tapered aft to a conventional empennage. A narrow, ply covered fin and a fabric covered rudder which extended down to the keel together formed a straight edged vertical tail with rounded heel and tip. The fin also mounted a straight edged, fabric over ply covered tailplane placed just above the fuselage, carrying straight tapered, similarly skinned 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

Performance


Related Research Articles

Slingsby Skylark 4

The Slingsby T.50 Skylark 4 was a British single seat competition glider built by Slingsby Sailplanes in the early 1960s. It sold in numbers and had success at national, though not world level competition.

Cijan-Obad Orao

The Cijan-Obad Orao is a competition single seat sailplane designed in Yugoslavia just after World War II, one of the most advanced of its type at the time. It flew in three World Gliding Championships, having greatest success at its first in 1950 when it reached third place.

The Kirigamine Mita is a training glider, seating two in tandem, designed in Japan in the early 1960s. A modified version, first flown in 1966, was produced in modest numbers.

Maeda 703

The Maeda 703 was one of the first indigenous Japanese gliders, a high performance single seat aircraft which first flew in 1940. Three were built, two with gull wing wings; one of these set a national endurance record in 1941.

The Aviomilano CPV1, also known as the Arlecchino, was an Italian high performance sailplane built in the early 1960s. Only one was built.

CVT2 Veltro

The CVT2 Veltro was an Italian competition glider built in the mid-1950s. Its advanced design incorporated a laminar flow wing, T-tail, retracting undercarriage and a reclining seat to reduce parasitic drag.

The Scheibe SF-30 Club-Spatz is a 15 m class single seat sailplane built in Germany in the 1970s and intended for club use.

The IIL IS-4 was a single seat, high performance sailplane designed by Iosif Șilimon and built in Romania in the late 1950s.

The IIL IS-5 was a single seat, high performance sailplane designed by Iosif Șilimon and built in Romania in 1960.

The IIL IS-7 was a two-seat, sailplane designed by Iosif Șilimon and built in Romania in the late 1950s. Only one prototype was built.

The IIL IS-8 was a two-seat sailplane designed by Iosif Șilimon and built in Romania in 1960. They served with Romanian gliding clubs.

The IIL IS-9 was a low powered, experimental pod and boom style motor glider, designed and built in Romania in the late 1950s.

The IIL IS-10 was a high-performance, single-seat glider, designed and built in Romania in the early 1960s. It was the first Romanian aircraft to use laminar flow airfoils.

The IFIL-Reghin RG-5 Pescăruș or CIL Reghin RG-5 Pescăruș was a Romanian single seat sailplane built in the 1950s. Twenty six were constructed for gliding clubs.

Schneider ES-57 Kingfisher

The Schneider ES-57 Kingfisher is a low-cost, short-span Australian glider capable of respectable cross country soaring flights. It was produced in small numbers in the late 1950s.

The Schneider ES-56 Nymph was a short span, Australian glider with a laminar flow wing, built in the 1950s. Only four were built.

The Merville SM.31 is a French high performance glider with a laminar flow wing, first flown in 1960. Only one was built.

The PWS-103 was a high performance, Polish 15 m span sailplane developed from the longer-span PWS-102 just before World War II.

Rubik R-03 Szittya I

The Rubik R-03 Szittya I was a Hungarian single-seat sailplane flown in the late 1930s. The design was developed through three improving variants. though only one of each was built.

The Jancsó-Szokolay M22 was a Hungarian single-seat sailplane first flown in 1937. Twenty were built and the type set several national records. Some remained in service up to about 1953.

References

  1. ↑ Taylor, John W. R. (1981). Jane's All the World's Aircraft 1981-1982. London: Jane's Information Group. p. 586. ISBN   0710607059.
  2. 1 2 3 4 Taylor, John W R (1964). Jane's All the World's Aircraft 1964-65. London: Sampson Low, Marston & Co. Ltd. p. 372.
  3. 1 2 3 4 Shenstone, B.S.; Wilkinson, K.G. (1963). The World's Sailplanes. II. Organisation Scientifique et Technique Internationale du Vol à Voile (OSTIV) and Schweizer Aero-Revue. pp. 204–5.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.