The beautiful cutaway drawing included in this answer shows a metallic turnip-shaped object attached to the bottom of the Ariane V core stage.
What is that object?
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10It's the Chemtrail generator obviously. – Antzi Dec 04 '19 at 04:53
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It's an Helium tank; nicknamed LHESS
This website capcomespace.net have a very good article on the subject (in french)
Extract (roughly translated):
The tanks pressurisation system preserve the tanks structural integrity, and a continuous propellant flow. The LOX tank is pressurised by 141kg of liquid helium stored at 7°K and 19 bar, warmed up by contact with the turbine exhaust. The flow is 0,2 kg-s, regulated by vanes on a rotatory disc. The H2 tank pressurisation is done with gaseous H2.
Some illustrations:
- 6 is labelled "6/ Sphère de pressurisation réservoir LOX (145 kg d' hélium)" => Helium for LOX tank pressurisation (145kg)
Also seen on this schematic with a similar label:
color legend: In light blue, the pressurisation line running up to the LOX tank, dark blue is the Liquid Helium tank. Green are He tank too, but used for the gimbal system
AirLiquide, the tank maker has a product page describing it here
Extract:
Proven experience ǀ LHESS supercritical helium tanks have been fitted on Ariane 5 since its first launch in 1996, thereby proving their efficiency and robustness. Moreover, they have been continuously improved to increase their performance
Antzi
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I love the schematic drawing! Thanks. You also explained what pressurized the hydrogen tank which I was curious about. – Organic Marble Dec 04 '19 at 04:56
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1@OrganicMarble added a short translation of the color code to highlight the He line – Antzi Dec 04 '19 at 05:01
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Literal translation: "LOX reservoir pressurisation sphere (145 kg of helium)" – wjandrea Dec 04 '19 at 15:55