2 ! One for each engine ! 
Here’s an easy question for the budding engineers among our Space Tweeps: how many thrust chambers does Ariane 5 have? The answer is in the latest Piece by Piece episode. #ArianeGroup #PieceByPiece #Ariane5pic.twitter.com/tzCuLRoYes
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En tonnes ?
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4! 1 on the first stage 1 on the second stage And 2 on the boosters!
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Believe or not is 5, because thrust chambers are the one to move the Ship in a moment notice in space and at different angles. I presume.
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