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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?

enter image description here

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    $\begingroup$ It's the Chemtrail generator obviously. $\endgroup$ – Antzi Dec 4 '19 at 4:53
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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: enter image description here

  • 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:enter image description here 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

enter image description here

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

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  • $\begingroup$ I love the schematic drawing! Thanks. You also explained what pressurized the hydrogen tank which I was curious about. $\endgroup$ – Organic Marble Dec 4 '19 at 4:56
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    $\begingroup$ @OrganicMarble added a short translation of the color code to highlight the He line $\endgroup$ – Antzi Dec 4 '19 at 5:01
  • $\begingroup$ Literal translation: "LOX reservoir pressurisation sphere (145 kg of helium)" $\endgroup$ – wjandrea Dec 4 '19 at 15:55

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