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The S5.4 (AKA TDU-1, GRAU Index 8D66), was a Russian liquid rocket engine burning TG-02 and AK20F in the gas generator cycle used to deorbit spacecrafts. It was used as the breaking engine of the Vostok, the Voskhod and earlier Zenit, even though those later switched to solid engines. The engine produced of thrust with a isp of 266 seconds in vacuum for a single 45 seconds burn, which was enough for the deorbit. It had a main fixed combustion chamber and four small verniers to supply vector control. It was housed in the service module and had two toroidal tanks for pressurization.〔〔〔 It was designed by OKB-2, the famous Isaev Design Bureau, for the Vostok programme. The breaking engine for the first manned spacecraft was a very difficult task that no design bureau wanted to take. It was considered very critical and a failure might have meant to see a man agonizing in space. A solid engine was considered, but the ballistic experts predicted a 500km landing error versus a tenth of that for a liquid engine. It took the coordinated efforts of his longtime friend, Boris Chertok and Sergei Korolev to convince Isaev to accept the task.〔 ==See also== *Vostok *Voskhod *Zenit *Isaev 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「S5.4」の詳細全文を読む スポンサード リンク
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