Tag: Superheavy

Superheavy booster #3 fires.

Capitalism in space: SpaceX yesterday successfully completed the first static fire test of the third Superheavy prototype, firing up three Raptor engines for about two seconds.

I have embedded the live stream from NASASpaceflight.com below the fold, cued to just before the engines fire. Because there was a delay of a few minutes from when the static fire was expected and when it actually happened, the announcers had began talking and were caught off guard by the burn.

Next up:

Booster 3 provides a first-time operation for fueling the huge booster with Liquid Oxygen (LOX) and Liquid Methane (CH4) during the test. How much propellant will be loaded, and the schedule for the sequence was unknown. However, NSF’s Adrian Beil wrote a feature on the expectations based on previous experiences with Starship being applied to Super Heavy.

Based on those evaluations, it was expected that Super Heavy would also undergo a Starship-like countdown of 45-60 minutes, with fueling beginning in the 30-40 minute range. Engine chill would then follow at T-12 minutes, ahead of the firing. As with previous Static Fires, the T-10 minute siren sounded, as per the alert notice to local residents. However, as with Starship, mini-holds can be expected, pushing the ignition time to the right. This proved to be the case on Monday.

The booster fired up all three engines for the expected duration, confirmed by Musk before he noted that “depending on progress with Booster 4, we might try a 9 engine firing on Booster 3.”

Booster #4 will be put on the orbital launchpad rather than the test pad, and is likely the booster to be used for the first orbital test flight of Starship, likely to be launched before the end of summer.
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Screen capture from NASASpaceflight.com live stream,
shortly after tank test of Superheavy

Capitalism in space: SpaceX’s first fullscale complete Superheavy prototype, dubbed #3, passed its first tank test yesterday.

Booster 3 was likely filled with a few hundred tons of liquid nitrogen relative to the more than 3000 tons its tanks could easily hold and the fraction of that total capacity SpaceX’s suborbital launch site can actually supply. Teams have been working around the clock for months to outfit Starship’s first orbital launch site with enough propellant storage for at least one or two back to back orbital launches – on the order of 10,000 tons (~22M lb) – but the nascent tank farm is far from even partially operational. That’s left SpaceX with its ground testing and suborbital Starship launch facilities, which appear to be able to store around 1200 tons of propellant.

Assuming the suborbital pad’s main liquid oxygen and methane tanks can also both store and distribute liquid nitrogen, which isn’t guaranteed, SpaceX thus has the ability to fill approximately 30-40% of Super Heavy B3’s usable volume. Frost lines aren’t always a guaranteed sign of fill level but if they’re close, SpaceX likely filled Booster 3’s tanks just 5-10% of the way during the rocket’s first cryoproof.

While the company still says it is aiming for a July orbital launch, that seems highly unlikely. They still have to do a Superheavy tank test with full tanks, plus static fire tests. They also need to get the orbital launchpad finished, with a full tank farm.

Nonetheless, SpaceX is moving fast towards flight of this heavy lift reusable rocket. I still think the odds are 50-50 it will complete its first orbital flight before SLS, even though its development began more than a decade later and has cost a tenth of the money ($6 billion vs $60 billion).

Capitalism in space: SpaceX has delivered to its Boca Chica launch site the first Raptor vacuum engine optimized for orbital operation.

The Starship prototype that will use this engine, as well as fly on the first orbital test flight, is #20.

While most of S20’s upgrades are a mystery, the ship’s thrust dome – spotted in work at Boca Chica earlier this month – has already confirmed that the prototype will be the first with the necessary hardware for Raptor Vacuum engine installation. That likely means that S20 will also be the first Starship to attempt to static fire six Raptor engines*, potentially producing more thrust than a Falcon 9 booster. On June 27th, one such vacuum-optimized Raptor (RVac) arrived in Boca Chica for the first time ever, making it clear that the comparatively brand new engine may already be ready to start integrated Starship testing.

*Update: SpaceX CEO Elon Musk says that the Raptor Vacuum delivered to Boca Chica on June 27th is, in fact, meant for Starship S20, seemingly confirming that the prototype will fly with a full six Raptor engines.

While this delivery as well as statements by both Musk and Gwynn Shotwell, SpaceX CEO, all point to an intended orbital test flight in July, the article at the link outlines the many tasks still undone that must be completed before that flight, all of which suggest that it will be August at the earliest before that flight can happen.

Nonetheless, SpaceX is barreling forward toward that first orbital flight, with clearly a goal to beat SLS’s first orbital flight, presently scheduled for November.

Capitalism in space: SpaceX engineers have removed Starship prototype #15, the first to successfully land after a test flight, from the launchpad and rolled back towards their assembly building.

They had already removed its three Raptor engines and landing legs for inspection, but taking the ship off the launchpad strongly suggests the company has decided to not fly it again.

The immediate assumption is that they will now fly prototype #16, built and ready for launch. The article however speculates something far more intriguing:

There’s a limited possibility that Starship SN16 – all but finished – could be sent to the launch site instead of heading straight to the scrapyard, but any testing would necessarily delay orbital pad construction and any flight activity would likely have to expend SN16 in the ocean rather than risk a land landing.

Ultimately, it’s looking more and more likely that SpaceX would rather go all-in on Starship’s inaugural orbital launch attempt, even if that means little to no ground or flight test availability for a few months.

Prototype #20 had been assigned that for that first near-orbital flight. Does this mean SpaceX has decided abandon #16 through #19 and to go straight to that orbital flight? To do this would also mean they have decided to forego any separate testing of Superheavy, and will instead fly it the first time with a Starship upper stage attached. It would also be the only possible way they could meet their July target date for that orbital flight.

If #16 does not move immediately to the launchpad and there are no Starship test flights for the next month or so, it will tell us that this is likely their plan.

Capitalism in space: It appears that the third Superheavy prototype, BN3 (Booster #3), is now being stacked and prepared for the first near-orbital flight of Starship, which SpaceX is still hoping to launch before the end of this year.

SpaceX has at least six BN3 sections – amounting to 22 rings and two of three tank domes – either completed or awaiting integration. The process of stacking BN3 began sometime in the last 7-10 days when SpaceX joined two four-ring sections – including the booster’s common dome, likely pictured above.

SpaceX has mostly completed BN3’s engine section, including a thrust dome with plumbing cutouts for a full 28 Raptor engines. Most recently, what looks like a Super Heavy fuel manifold appeared in Boca Chica. That manifold will attach to the end of a supersized Super Heavy transfer tube – also spotted in work – used to route methane through the liquid oxygen tank to fuel its Raptor engines. Fueling 28 large, high-performance Raptors is no mean feat and requires a rat’s nest of plumbing to feed them more than 15 metric tons (~30,000 lb) of propellant every second at full throttle.

Put simply, a majority of Super Heavy booster BN3’s hardware appears to be ready or almost ready for integration. The eight rings now stacked represent approximately 20% of the rocket’s full height, leaving another 30 or so rings – 54m (~180 ft) – to go.

That flight, the flight plan of which has already been submitted to the FCC, would take off from Boca Chica, circle about three-quarters of the globe, and land in the Pacific to the northwest of Hawaii. While not a full orbit, this flight would demonstrate an orbital capability while allowing for a controlled safe re-entry at a planned location, a wise approach for that first orbital attempt.

Capitalism in space: SpaceX’s fifteenth Starship prototype successfully completed a static fire test yesterday, and the company is now hoping to do its first test flight this week, possibly as early as tomorrow.

Meanwhile, preparations continue for the first test launch of a Superheavy prototype, as well construction at Boca Chica of the orbital launchpad.

The Orbital Launch Site is a hive of activity, with work ranging from the installation of large GSE (Ground Support Equipment) tanks to continued work on the launch mount and launch and integration tower.

The latter has now started to rise into the air next to the mount, which is yet to receive its launch table.

When finished, the tower will be the tallest structure in the region, at nearly 152 meters — towering over the 120 meter tall, fully integrated Starship/Super Heavy stack. The Tower will eventually host a crane and, as crazy as it initially sounded when Elon revealed it, arms designed to catch the returning booster.

It is not yet clear what the test schedule for Superheavy will be leading to that first orbital launch. They will likely fly a prototype on a hop first, then fly it with Starship stacked above. SpaceX however has not said exactly what its plans are, and even if it had, the company has been quite willing to revise those plans should it decide a change is advisable.