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Gribovski G-7
The G-7 (Russian: Грибовский Г-7) was a successful development of the previous types. As the tests of the high wing model G-6 did not bring the expected results, Gribovski decided to return to the configuration with mid wings, successfully tested on the G-2.
The G-7 glider was designed as a cantilever high-wing aircraft with medium deployment and E-385 profile. The wing had two wooden spars with a box-like structure and a sparse distribution of the wing rib. This characteristic caused the wing covering to form kind of waves on the wing surface.
The fuselage had a monocoque structure with plywood covering and its lower part ended in a ski, which guaranteed landing.
The tail was of the conventional monoplane type, with a very tall tail.
The pilot sat in an open cockpit just ahead of the wing's leading edge.
The glider was designed and built at the Orenburg Flight School in 1929, during Gribovski's years as an instructor. Due to the lack of space for construction, the group of enthusiastic builders relied on an abandoned church, working in the area of ​​its bell tower. The different finished parts were lowered to the ground using ropes and then assembled.
In the VI National Competitions of 1929 Gribovski presented with the G-2 and G-6 models, participants in previous years and with the new G-7. Characteristic of Gribovski , the three designs stood out for their small dimensions, light weight and constructive simplicity.
The G-7 was one of the best gliders among the participants in the VI National Sailing Competitions, both for its stability in flight and for ease of control.
On October 16 1928, the pilot VA Stepanchonok tried to set a new flight record in this model. It originally took off from the north slope at 4:00 am, but the absence of wind caused the glider to soon descend. At 6:17 am he made the attempt again and this time with success. The glider stayed aloft throughout the day setting a Soviet record for flight duration of 10 hours 22 minutes.
Throughout the day the average flight height did not exceed 150 meters. Only in late afternoon and with the appearance of some cloudiness, Stepanchonok managed to ascend to about 500 meters.
A year later the G-7 would participate again in the competitions. On this occasion it would once again be a reference by achieving a continuous flight of 23 hours and 40 minutes.
Wingspan: 14.50 m
Wing area: 15.00 m²
Length: 5.45 m
Surface of the horizontal plane: 2.16 m²
Vertical plane surface: 1.08 m²
Spoiler area: 2.2 m²
Aspect ratio: 14
Empty weight: 143 kg
Wing loading: 14.9 kg / m²
Glide ratio: 25.4
Accommodation: 1

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