It became known that the “Cheget” chair, which is planned to be used in the manned spacecraft “Oryol”, will be able to withstand significantly higher loads than the “Kazbek-UM” seat, which is used in the “Soyuz” spacecraft. This was reported by the TASS news agency with reference to the words of Sergei Pozdnyakov, General Director of the Research and Production Enterprise “Zvezda”.
“The customer has now significantly increased the handling requirements. On “Kazbek” it was up to 70 g, and on “Cheget” – up to 100 g“, – said Mr. Pozdnyakov. For comparison, the value of the overload of a body at rest on the Earth at sea level is 1 g.
He also noted that the mission of any spacecraft chair is to absorb the congestion in such a way that it does not exceed human tolerance limits. Thus, for the spine, the maximum permissible overloads are 16–18 g, and the time of their exposure should not exceed a few milliseconds. Overloads are damped by a special shock-absorbing system.
Currently, the Cheget chair is at the stage of ergonomics testing, after the completion of which technical tests using a dummy will begin. Unlike the Kazbek seat, the Cheget chair is reusable. Its main feature is the absence of an individual lodgment. The “Cheget” chair has adjustment systems for the shoulders, pelvis, height and leg length, due to which it will be possible to maintain a fairly rigid fixation of the astronaut. The angles in the knee and hip joints were also increased, due to which it is possible to avoid swelling and discomfort. Two shock absorbers in the Cheget chair will help reduce vertical and longitudinal overloads.
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