Rocket Lab updated the project milestones on their Neutron page to move the first Archimedes engine hot fire from the last milestone of 2023 to the first slot in 2024. While this is a bit of a slip it seems to be a minor one and not real cause for concern at the moment. Rocket development projects without timeline adjustments just aren’t a thing so adjustments should be expected along the way. Rocket Lab is still very well positioned to make the required progress in the year ahead as you can see from my roundup of 2023 development updates. Notably, they did not push launch into 2025 while making their edits. Do I think the first Neutron launch is likely to slip to 2025? Yes, but I think most analysts assumed that would be the case when Rocket Lab committed to their admittedly aggressive timeline. One milestone slip does not necessarily doom a timeline, however, and Rocket Lab might still pull it off. I expect clear guidance from them on that in the new year.

I’ve updated my earlier post on the milestones to reflect this update.