They deliver more than 90 percent of the launcher’s total thrust at the start of flight and burn for 130 sec.
before they are separated over a designated zone of the Atlantic Ocean.
The Ariane 5’s vehicle equipment bay integrates the guidance, stage sequencing, telemetry, tracking and safety systems.
Two redundant ring laser gyroscopes are used for inertial reference and guidance during the mission.
A cluster of GH2 thrusters is used for roll control.
Flight control is provided by the boosters’ movable nozzle, which is driven by hydraulically-controlled servoactuators.The Vulcain burns for just under 600 seconds, providing up to 116 metric tons of thrust in vacuum.The stage has an overall length of 30.5 meters from the Vulcain main engine’s nozzle to the forward (upper) skirt.During the powered flight, the attitude control in pitch and yaw is ensured by gimballing of the engine’s nozzle, while gaseous hydrogen thrusters are used for roll control.
During the ballistic phase, roll, pitch and yaw control uses clusters of gaseous hydrogen thrusters, while gaseous oxygen thrusters also are employed for longitudinal boosts.
To streamline the assembly process, Ariane 5’s vehicle equipment bay and ESC-A cryogenic upper stage are installed as a single unit atop its cryogenic core stage.