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Fourth stage AVUM & IS34 The upper module of the Vega, developed by Avio, has been designed to place the payload in the required orbit and to perform roll and attitude control functions. It is called Attitude and Vernier Upper Module (AVUM) and comprises two separate sections: one housing the propulsion elements and another containing the platform for the avionics module. The propulsion module performs the attitude control and axial thrust functions during the final stages of the flight, enabling the payload to be placed in its orbit. Unlike the previous stages, it is equipped with a liquid bipropellant system for primary manoeuvring, that uses nitrogen tetroxide as oxidising agent and unsymmetric dimethylhydrazine as propellant, both of them fed by pressurised Helium, and it has a cold gas attitude control system. This stage is 1.72 m tall, 1.9 m in diameter and requires a total propellant load of between 250 and 400 kg, depending on its configuration and the mission to be performed. Positioned above the engine, the avionics module contains the main elements of the avionic subsystem of the launcher. |
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Length: 1.742 m Max diameter: 1.910 m Mass at Lift-off: 1237 kg Burn time: 694.5 s Total Impulse: 1 702 KN s Structural Ratio: 53.3% |
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