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The JAI-21 (Russian: ХАИ-21) deltaplane was the first Soviet experiment using Rogallo-type wings. At the beginning of the 1960s, works on ultralight flying machines with “elastic” wings of the Rogallo type began to appear in scientific and popular literature around the world. The concept of deltaplane with "elastic" wing in the USSR was known by the terms Gibkolet and Deltalet.
In the USSR the first experiments with such a wing were developed at the Kharkov Aviation Institute in the form of JHA-21.
The JAI-21 was created at the SKB JAI between 1969 and 1972.
To check the flight characteristics of the motorized gibkolets the students AP Klimenko and V. Moiseyev under the direction of AF Pilnik initially built a model.
Constructively, the JAI-21 was made up of two independent components: the elastic wing and the motorized nacelle. Behind the pilot's seat was a 32 hp MT-9 engine moving a wooden propeller.
At the rear of the tail bar was located the tail unit. The landing gear was of the tricycle type with the front wheel of the steerable type.
The direction of the apparatus was carried out by means of a lever similar to that used in airplanes.
Construction of the model was completed by spring 1972 and first flown that year. With a take-off weight of 320 kg and a cruising speed of 90 km / h, a flight range of 150 km was calculated.
The JAI-21 was shown at the VDNJ of the USSR, as well as at international exhibitions in Canada and the United States, causing a good impression among specialists.
In 1986 the JAI-21 had a renaissance when students transformed it into the JAI-40 light aircraft.
Engine: 1 x 32hp MT-9
Wingspan: 8.00 m
Wing area: 2 m²
Length: 2.80 m
Maximum takeoff weight: 320 kg
Maximum speed: 90 km / h
Practical range: 150 km
Seats: 1

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