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The KTDU-80 (Russian: ) is the latest of a family of integrated propulsion system that KB KhIMMASH has implemented for the Soyuz since the Soyuz-T. It integrates main propulsion, RCS and attitude control in a single system pressure fed from a common dual string redundant pressurized propellant system. The common propellant is UDMH and N2O4 and the main propulsion unit, is the S5.80 main engine. It generates of thrust with a chamber pressure of and a nozzle expansion of 153.8 that enables it to achieve a specific impulse of . It is rated for 30 starts with a total firing time of 890 seconds. The integrated system without the pressurization nor tanks weights and is an integrated unit that is long with a diameter of .〔〔〔 ==Description== The KTDU-80 system integrates a dual string redundant propellant and pressurization system, a main propulsion system (the SKD), an RCS (the DPO-B) and an attitude control system (the DPO-M). All the propulsion elements are pressure fed rocket engines burning UDMH and N2O4 with a common supply of pressurized propellant.〔 Mechanically, the KTDU-80 is separated in two sections: *Basic Unit (BB) (Russian: ): It is the main propulsion and includes all propellant pressurization and storage system. It is subdivided into three subsystems: * *Pneumatic Pressurization System: It is the system that keeps all tanks and lines pressurized and guarantees the correct working pressure is maintained in the storage and the propulsion subsystems. Given the use of pressure fed engines, this subsystem is critical and a failure could mean that the crew is kept stranded in space. * *Propellant Supply System: It which ensures propellant supply to the Orbital Maneuver Engines. Includes storage and propellant distribution. * *Orbital Maneuver Engine (SKD) (Russian: ): *Berthing/Attitude Control Thruster Subsystem (DPO) (Russian: ): It is reaction and attitude control system. It is composed of two subsystems: * *The redundant propellant supply subsystem. * *The Berthing/Attitude Control Thrusters (DPO) (Russian: ): These are all the thrusters used to control the attitude and translation movements. It has two different sets of thrusters: * * *High thrust thrusters (DPO-B) (Russian: ): These are used for attitude, translation, docking and undocking maneuvers and as backup de-orbit engine. * * *Low thrust thrusters (DPO-M) (Russian: ): These are used exclusively for attitude control. Each subsystem is describe in the following sections.〔 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「KTDU-80」の詳細全文を読む スポンサード リンク
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