I deem senario 1: Drop-in replacement of Promethee instead of Vulcan 2.1 very unlikely. A Ariane Next that uses a promethee engine would always be a completely new/different launcher. LOx-LH has a density of 0.28-0.32 mT/M3 (kg/L); LOx-LNG (LCH4) is 0,82-0,83 mT/M3. So the fuel mass in the Core stage would nearly triple. So one Prometheus would not suffice.A Vulcain 2.2 or 2.3 (2.2 is already planned if I'm not mistaken) would be a much more logical drop in replacement. Vulcain 2.2 has 3D printed Turbopumps if I'm not mistaken. A new injector design (additive manufactured) and ignition system would lower the cost of a Vulcain engine a lot. I think that's a beter alternative than Scenario 1.
Interesting information, thanks.Will there be any other changes with Vulcain 2.2 and 2.3 (eg, thrust upgrade) or are they solely aimed at lowering the production cost?
Link to GKN video about new rocket engine production technology.I didn't known Vulcain 2.3 was actually really in development.Can you share some sources?
Airbus Safran Launchers tweeted a short video of the Prometheus 3D printed injector (is that what it is?).https://twitter.com/aslaunchers/status/842036194259136512
L'usine nouvelle has an interesting report about CNES plans for the post-Ariane 6 time. Codewort "Ariane Next"Vous avez aimé Ariane 6, vous allez adorer Ariane NextIt's all in french, so here is short a summary:• A launcher for "beyond 2030".• At the moment a team of 15 is working on the concept.• Further cost reduction by a factor of 2, compared to Ariane 6.• Tailored to both Commercial and State customers.• Development time reduced from 10 to 5 years.• Adaptable industrial base: o Ability to increase production if demand requires it... o But able to scale down and stay profitable if the commercial market shrinks.• The designated engine is Prométhéus o 10x cheaper to manufacture (compared to Vulcan 2) o 50% production time o Extensive use of additive manfivuating aka 3D-printing o Methane instead of LH2 propellant, easier to handle, yet similarities should speed up development. o One possible scenario is to use Prométhéus for both 1st and 2nd stage.• Callisto will be the prototype for reusability o Re-ignition at high altitude studied by Onera• Possibility of 2nd stage reuse is being considered.• Upper Stage could remain in orbit and conduct several GTO missions