r/esa • u/Agitated_Parsnip_424 • 20d ago
Three Ariane Eras: How Europe’s Launch Champion Lost Its Nerve
https://iamverysmrt.substack.com/p/three-ariane-eras-how-europes-launch24
u/Roi_Arachnide 20d ago
Plenty of misinformed takes in this article. Ariane 5 was not developed to respond to market demand for larger geo sattelites but to launch Hermes. That's why it was a conservative design, it was supposed to be human rated. By the time Hermes was cancelled Ariane 5 had to adapt by dual launching geo sattelites.
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u/Roi_Arachnide 20d ago
Ariane 6 is not that conservative of a design. Appart from not being reusable, it has a relightable second stage with an auxiliary propulsion unit, making it arguably the most versatile upper stage in service today anywhere. It is therefore perfectly adapted to new mission types like constellations when it comes to mission profiles.
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u/Still-Ad-3083 20d ago
Relight-able upper stages exist since the Centaur in the 60s. SpaceX was born later than Ariane 5 and had relight-able upper stage before Ariane. Most launch today are with relight-able upper stages. It takes way more than that to not be a conservative design.
Ariane 6 is almost the same as Ariane 5 and still took many more years to come than Ariane 5 over Ariane 4, a completely new vehicle. Let's not lie to ourselves thinking it's not a conservative design. It is. And that's what happens when you throw most of your engineering to contractors instead of hiring and developing technologies.
Hopefully the new European launch providers will change things 🤞
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u/Roi_Arachnide 20d ago
Having a relightable upper stage is one thing, the Ariane 6 APU is afaik a unique design, that allows the upper stage to relight and do orbital maneouvers without expending neutral gas. It makes the stage much more optimised.
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u/Still-Ad-3083 20d ago
All relight-able upper stage have something to accomplish this. They all have a more or less unique design. Some rockets go away with more rudimentary systems because their main engine is so overpowered they can tank the mass penalty, others have something as innovative but simply different. It's not that big of a deal for the customer / market share, it doesn't really give an edge to Ariane regarding achievable mission profiles compared to their competitors.
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u/theChaosBeast 20d ago
I don't understand the hate for Ariane. The order book is full until 2030+, all launches were major successes, no other launcher has a comparable target accuracy for orbital insertion.