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Gribovski Biesprizornik
The Gribovski Biezprizornik (Russian: Грибовский “Беспризорник”) competition glider came from a Gribovski concept project.Its designer barely had time to pay attention to its construction, so it was decided not to include it in the numbering sequence of his creations. Rejected by his "father" the model would be jokingly nicknamed "Biezprizornik" (neglected or neglected).
The Biezprizornik construction was carried out by Groshiev, Sirken and Filyushkin, belonging to the Construction Bureau of the Union of Defense and Aviation Assistance Societies-Chemical Construction of the USSR (OSOVIAJIM).
Construction was carried out at the Moscow OSOVIAJIM Glider Factory during 1932.
Constructively, it was a high-wing monoplane with a sunshade, braced to the lower fuselage structure by four struts.
With the aim of reducing construction times and being able to participate in the 1932 competitions, instead of the original Gribovski wing, the brigade adapted the wing of an Antonov “Upar” (Ps-1) glider to the model. In its central part, this wing had a rectangular shape, but towards the ends the chord was tapering until it ended almost at a point. Much of the trailing edge of these outer sections was occupied by long louvered ailerons. The selected wing profile was the TsBPK (ЦБПК) and the entire construction was made of wood, with fabric covering.
The fuselage featured a hexagonal section with lightened frames and six stringers, constructed of 12 x 12 mm slats. Due to a mistake by the constructors, the glider received a too long nose, which resulted in a deterioration of its handling in turns. A landing skid was located in the ventral region of the fuselage.
The tail was of the monoplane type with a large area rudder attached to a small keel built integrally with the fuselage. The two horizontal planes shared a single spar. The assembly process for these plans was very labor intensive, as the builders left very small hatches on the sides for service.
The pilot was located in a cockpit just in front of the wing leading edge. The control from the cabin was carried out with the help of the lever and pedals. The transmission system to the ailerons was copied from that of the Antonov Us-4 and Ps-2 gliders. An interesting detail was that the bow, up to the first frame, could be pivoted open to one side, to give easy access to the control systems.
Gribovski, busy with the problems of keeping the MKB open, could not devote much attention to monitoring the construction, so he decided not to assign the glider its numbering, although he did not refuse to register it under his authorship.
The name "Biezprizornik" was given to the glider in jest. Once the initial tests were completed, the glider was sent in a railway car to the Koktebel Superior School of Planning . In some inexplicable way the glider got lost on the way and for about six months it travelled along the railroad tracks until it finally reached the school, well into 1933. The flight instructors at Koktebel decided to nickname it "Biezprizornik" in reference to the lack of a "Owner" who cares about his delivery for the competitions.
During the glider tests it was decided to change the wing attack angle, but this modification had little influence on the behaviour. The rudder control system had to be revised on several occasions and the ski was replaced, which suffered ruptures due to the great gap between its points of support and the lack of a suspension system.
It participated in the IX and X editions of the National Sailing Competitions. During the IX call the glider “Biezprizornik” would achieve the longest flight of the competition by staying in the air for 62 hours and 30 minutes.
The glider was used for several years as a trainer at the Koktebel High School of Planerismo. From 1933 on in the pilot training practice, aerobatic flights on gliders were included. The Gribovski G-9 and Sheremetiev Sh-5 gliders were used for this purpose. Preliminary preparation was carried out on the “Biezprizornik” glider and included the execution of barrels, eights and the entry training in thermal currents, with a duration of 5 hours of flight.
Only the one copy was built.
Wingspan: 13.8 m
Wing area: 17.00 m²
Length: 6.57 m
Height: 1.42 m
Empty weight: 117 kg
Wing loading: 11.0 kg / m²
Glide ratio: 15.20
Stabilizers surface: 1.1 m²
Elevator area: 0.85 m²
Empennage surface: 0.07 m²
Rudder surface area: 0.70 m²
Ailerons surface: 1.72 m²
Accommodation: 1

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