We are 
We know our rockets from head to toe 
, but can you tell the difference between the"Cryogenic Upper Stage, the Solid Rocket Booster and the Cryogenic Main Stage ? #ArianeFacts #TuesdayTopicpic.twitter.com/wk5Ts7R45N
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If any of you want to explain how each stage work specifically, feel free to reply and we may RT some of the smartest responses.
#ArianeFacts #TuesdayTopicpic.twitter.com/h33JPRhMBw
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Main stage EPC burn liquid hydrogen and liquid oxygen on Vulcain motor to provide approx 10% of total thrust. Very low thrust, but high ISP for more efficiency.
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Solid rockets boosters EAP burn a solid propellant to provide other 90% of thrust at startup. It's needed for lift Ariane 5 at startup and for two first flight minutes. Low ISP but very high thrust. Very useful for liftoff. Kerbal proverb : « in doubt, add moar boosters »
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For me the most impressive stage are the two EAP. First, they have a steerable nozzle, which is very rare for a solid booster! By the way, it's the booster that has the largest gimbal of all! 1/?
- CNES/Service Optique/VA-235pic.twitter.com/14Xkh6k4Ei
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Then, during the ignition of the boosters, their flame goes up almost to the top of the EAP, hiding them almost completely! On some flights we can even see traces of black soot on the boosters! (Example here : ) 2/?
- CNES/Service Optique/VA-233pic.twitter.com/to9mA93e72
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I will talk about logistics. All the stages are integrated in Europe and then transported to Guiana by the MN Colibri or MN Toucan boats. In fact only the EAPs are not integrated in Europe for safety reasons. It is integrated by Europropulsion at Kourou.
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