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Cheranovski BICh-8
In parallel with the development of the BICh-7, the construction of a new glider model began in the workshops of the Air Fleet Academy. The Cheranovski BICh-8 (Russian: Черановский БИЧ-8) was the first Cheranovski design to move away from the parabolic wing pattern.
Unlike previous Cheranovski models, the BICh-8 device featured a triangular-shaped wing on the plane, which is why it was nicknamed “Triugolnik” (Triangle).
The BICh-8 was designed as a single-seater experimental glider built entirely of wood. The first thing that stood out was the simplicity of its construction and its low weight.
The cantilever wing and high implantation, had a triangular shape and a structure of three spars. This wing was conceived in three sections: a central one forming an integral part of the fuselage and the long wing consoles with the rudders at the ends. The union of the consoles to the centroplane was made by means of some steel pieces. The entire leading edge was covered with a 1mm thick plywood sheet.
The entire leading edge was covered with a 1mm thick plywood sheet. The straight trailing edge featured control surfaces along the entire span, located on a bar on the soffit of the wing, just below the trailing edge. In the interior part and in order to achieve the necessary longitudinal balance when displacement of the center of gravity occurs, some adjustable stabilizers were located on the ground. The wingtip rudders functioned unconventionally, only operating outward and independently.
The fuselage was covered with plywood. The landing gear, located in the lower part of the fuselage, following the longitudinal axis of the glider, was made up of a ski. Payback was obtained by inserting an inflated bicycle tube between the ski and the fuselage. The wingtips served as stabilization skids.
The pilot was located in a cockpit forward. His cabin was narrow and not very comfortable. The control lever had a low stroke, especially in relation to the handling of the ailerons.
Construction was completed too late in 1929 to allow it to participate in the National Sailing Competitions. For this reason, the glider spent almost a year out in the open and without care, before being flown for the first time, shortly before the competitions the following year.
Cheranovski next to the BICh-8 during testing
In the BICh-8 glider, 7 races and 12 flights were carried out, of which the final four were carried out from the heights of the Moscow gliding station "Piervomaiskaya" (MOAJ), being flown by RA Pishuchiev and MF Romanov. During the first flights this glider showed a marked tendency to lower the nose, for which it was necessary to add a small weight in the tail section. The BICh-8 glider stood out for its good stability, both longitudinal and transverse, but it was very sensitive to rudder movements, not accepting sudden reactions. The landing had to be done carefully.
The descent speed, measured on September 29 with a stopwatch by ground observers, was in the range of 22 - 25 m / s, quite good for a device of its kind. The results could have been superior, but the long time without care in the open slightly deteriorated the coating of the glider.
A certain level of vibrations that appeared during flight number 12 and the poor performance led to the abandonment of the tests.
In 1931 the BICh-8 was flight tested by SP Koroliov, who valued the model positively.
Wingspan: 10.80 m
Wing area: 14.00 m²
Length: 2.92 m
Empty weight: 60 kg
Maximum takeoff weight: 130 kg
Wing loading: 9.3 kg / m²
Glide ratio: 18
Stabilizer surface: 1.84 m²
Ailerons surface: 1.68 m²
Accommodation: 1

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