Chizhevski BOK-1
| BOK-1 ("SS") | |
|---|---|
| BOK-1 undergoing state trials, 1936 | |
| General information | |
| Type | High-Altitude research aircraft |
| National origin | Soviet Union |
| Designer | Bureau of Special Designs Vladimir Chizhevsky (Designer) |
| Built by | Plant № 39 (Moscow) (1932-1934) Plant № 35 (Smolensk) (1935) |
| Status | Retired |
| Number built | 1 |
| History | |
| First flight | December 13 1935 |
| Developed from | Tupolev ANT-25 |
| Developed into | BOK-7 |
| Fate | Unknown |
The BOK-1, where "BOK" stands for Byuro Osobyh Konstrukcij (Russian: Бюро Особых Конструкций) meaning "Bureau of Special Designs", also known as "SS" — Stratosfernyj Samolyot (Russian: "СС" — Стратосферный Самолёт) meaning "Stratospheric Plane", was a 2-seat, single-engine, low-wing monoplane, designed as an experimental high-altitude aircraft to study the feasibility of performing flights at altitudes above 11,000 metres (36,000 ft). It was the first Soviet plane to implement a pressurized cabin.