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Gribovski G-12
Gribovski G-12 glider during competitions at Koktebel.
With the objective of studying the potential of take-off and landing on the water, Gribovski decided in 1933 to build an experimental hydrofoil that received the name G-12 (Russian: Грибовский Г-12).
The G-12 glider was designed as a single-seater hydrofoil with a single-beam hull and high cantilever wing that had stabilization floats fixed to a support and braced by means of uprights on its external side. The wing structure comprised two box-like spars, joined together by light ribs. The wing was covered with 1 - 1.5 mm thick plywood, creating a flexible but strong structure. The wing had a fabric covering.
The hull had straight sides with a curved top and a 19-frame structure, a tail spar and five stringers. The entire hull was covered with 1.5 - 3 mm thick plywood nailed to the structure with zinc-plated lace and covered with glued canvas and enamelled in silver. Oil paint was used internally.
The G-12 glider was designed to operate in the water and on land, so the entire outer skin up to the tail post featured an ash skid designed for land landing at the bottom.
The tail area made transition towards the empennage and the thin stabilizer braced in its lower part by two short uprights.
The pilot was located in an open cockpit forward, in front of the wing leading edge.
The entire glider was painted silver.
The Gribovski G-12 glider was designed and built at the Moscow Construction Bureau (MKB) in 1933.
With the number "52" painted in black on its empennage and the name of the VVS chief "Alksnis" on the sides of the bow, it participated in the IX National Sailing Competitions. After the development of the normal flight tests, the G-12, piloted by AK Ioost, took off from the Uzun-Cyrt mountain, landing in the waters of the bay at Koktebel. It is noteworthy that landing proved to be considerably smoother than landing.
G-12 “Alksnis” hydrofoil on the Crimean beach during testing.
Later, in this same bay, an attempt would be made to carry out take-off tests from the water. Towing attempts from a motorboat and then from a Shavrov Sh-2 amphibious hydrofoil were unsuccessful. During the drag, when one of the side floats touched the water, they sank and slowed the glider. As a result of this the tests of aquatic operations were cancelled and from that moment the G-12 was only used on land.
Wingspan: 15.20 m
Wing area: 15.40 m²
Length: 6.50 m
Height: 1.45 m
Empty weight: 157 kg
Wing loading: 15.4 kg / m²
Stabilizers surface: 0.22 m²
Elevator area: 1.77 m²
Empennage surface: 0.9 m²
Rudder surface area: 0.9 m²
Aileron surface: 1.3 m²
Accommodation: 1

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