SpaceX frees up orbital launch site for advanced Super Heavy booster

After ‘destroying’ Starship S20, SpaceX has officially removed Super Heavy Booster B4 from Starbase’s lone orbital launch mount – and possibly for the last time.

About 69 meters (~225 ft) long and weighing at least 200 tons (~440,000 lb), Booster 4 has been at SpaceX’s Starbase Orbital Launch Site (OLS) for more than six months – longer than Starship S20 Only a short time, which was expected to eventually launch into space. Many of those months sat on top of the pad’s 22-metre-long (~70 ft) orbital launch mount, which was slowly but surely designed, modified, and supported to support basic Super Heavy testing. turned into something capable of doing.

All told, Booster 4 has completed more than a half-dozen cryogenic-proof tests, but never graduated to the more complex and valuable wet dress rehearsals — flammable liquid methane and methane to simulate preparations for an actual launch. Replacing neutral liquid nitrogen with oxygen propellant. Most importantly, despite having 29 proof-tested Raptor engines installed for months, the Super Heavy B4 never attempted to make steady fire. One Of those engines, where a successful 29-engine steady fire is probably the single most important test that the booster would need to pass in order to be cleared for flight.

As a result, the writing for Booster 4 has been on the wall for quite some time. Rather than invest in testing the booster, which has a somewhat outdated two-off design, it appears that SpaceX will instead move critical qualification testing to Super Heavy Booster 7. As discussed earlier, on top of the usual improvements to the process and fit and finish, Booster 7 is quite different from Booster 4.

“The Super Heavy B7 and Starship S24 featured extensive design changes, including a substantially revised header tank, an entirely new nosecone design, new layouts for the secondary systems (pressurization, avionics, heat exchangers, etc.), and more. Most importantly, their thrust structure – giant ‘pucks’ made of steel – has been tweaked to support the new Raptor V2 engines instead of the Raptor V1 and V1.5 engines that all Starships to date And installed and tested on super heavy prototypes.”

Teslarati.com – March 22, 2022

One could easily argue that SpaceX should have made better use of the months after the super heavy B4 remained dormant and largely untouched in Starbase’s launch facilities – instead using that time to conduct basic static fire tests. which could also be done in one of the two suborbitals. Launch mount if orbital mount was not ready. Still, despite this seemingly wasted opportunity, it makes sense that SpaceX now wants to cut its losses and focus its attention on prototypes with extensive upgrades and improvements.

Thereafter, SpaceX will continue to stack and outfit Starship S24. Already fully stacked, the Super Heavy B7 could be towed to the orbital launch site at almost any point in the next week or two to begin simple pneumatic and cryogenic proof tests, followed by Raptor V2 engine installation. And to start static fire testing.

SpaceX frees up orbital launch site for advanced Super Heavy booster