this post was submitted on 28 Jun 2023
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Hot Staging (www.youtube.com)
submitted 1 year ago by few to c/spacex
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Recent news suggests that SpaceX are pivoting to hot-staging instead of the flip maneuver for getting Starship away from the booster. Looking at the Titan II hot staging it seems like it would be a violent and explosive event. How could this be mitigated? A hardened cover on top of the booster would be a significant weight penalty. Do the expected gains really outweigh the additional weight?

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[–] few 2 points 1 year ago (2 children)

If you look at what happened with the interstage on the Titan II then you get an idea of some of the forces acting. Even after the second stage had moved away a few feet, when the engines throttled up the whole interstage was just blown apart. And that was just one small engine, not six raptors.

Perhaps the interstage will be sacrificial. Perhaps they don't care at the moment because the early test boosters are not recoverable anyway. Maybe they'll go back to the flip when other parts have been proven. So many unknowns.

[–] [email protected] 4 points 1 year ago

I don't know much about the Titan II but some of those early rockets couldn't support their own weight and relied on internal pressure to maintain structural integrity. If they lost pressure they'd crumple. We already know the Superheavy booster is more robust than that so maybe with just some internal cooling it can survive hot staging.

[–] meldroc 3 points 1 year ago

Since Superheavy is still under power (center 3 engines, at 50%), maybe it just steers out of the exhaust before Starship lights the vacuum Raptors.