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SpaceX tests fully stacked Starship rocket for the first time

(NASASpaceflight)

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4 years ago

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After rapidly stacking Ship 20 and Booster 4 the evening prior, SpaceX appears to have begun testing a fully stacked Starship rocket for the first time ever.

Though the test SpaceX subjected Starship to was by no means ambitious and in spite of the fact that it no longer appears that Ship 20 and Booster 4 will ever fly, the first test of the first fully integrated prototype of a new rocket is still an immensely significant achievement – particularly so for the largest rocket ever built.

Standing around 119 meters (~390 ft) tall, Starship is unequivocally the largest and most voluminous rocket ever built. With its 29 Raptor V1 engines, the fully assembled Ship 20 and Booster 4 (B4) stack would have likely weighed around 4000-5000 tons (9-11M lb) and been able to produce around 5400 tons (11.9M lbf) of thrust at liftoff – substantially heavier and more powerful than Saturn V or N1, the largest rockets ever successfully and unsuccessfully launched.

For its first fully-integrated test, though, SpaceX appears to have put Starship through a fairly limited cryogenic proof – a test where flammable propellant is replaced with a similarly cold (cryogenic) fluid that’s similar enough to subject a rocket to similar thermal and mechanical stresses. For Ship 20 and Booster 4’s combined debut, Super Heavy was filled maybe 10-20% and Starship around 25-50% of the way with either liquid nitrogen (LN2) or a combination of LN2 and liquid oxygen (LOx). It’s difficult to tell but it’s unlikely any methane (LCH4) fuel was involved.

Back on the ground, Starship S20 completed five separate cryogenic proof tests before its first test on top of Super Heavy. More importantly, Ship 20 successfully completed several static fire tests, each of which also functioned as a wet dress rehearsal with LCH4/LOx propellant. Booster 4 had also passed several cryogenic proof tests. In that sense, it’s unlikely that SpaceX had a great deal of uncertainty as to whether either prototype would be able to complete yet another test.

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Beyond the basic mechanical demonstration that Super Heavy Booster 4 is strong enough to support a partially loaded Starship, which probably wasn’t in doubt, it’s likely that the main purpose of this first full-stack cryoproof was to ensure that all the systems required to fuel Starship on top of Super Heavy were working as expected. That’s no small feat given that Starship is both the tallest rocket and largest upper stage ever assembled. To fully fuel a Starship for an orbital launch, around 1200 tons (~2.65M lb) of propellant (or LN2 for a cryoproof) – equivalent to the weight of more than two entire Falcon 9 rockets – must be pumped around 85 meters (~275 ft) up Starbase’s integration tower.

That requires thousands of feet of plumbing and a symphony of giant valves and pumps, all of which must work in concert – without leaking, jamming, or freezing – to fuel Starship. As such, the first full-stack cryoproof was just as much – or more – of a test of the orbital launch site’s launch/integration tower and tank farm. That first test is just the start of a long process, though, and it’s likely that SpaceX will attempt an increasingly ambitious series of tests with Booster 4 and Ship 20 over the next week or two.

That could involve simply filling the rocket further and raising its tank pressures or it could potentially culminate in a partial wet dress rehearsal with methane and oxygen propellant in place of liquid nitrogen. There’s an even smaller chance that SpaceX could attempt to static fire Super Heavy B4 for the first time, although sources like NASASpaceflight are no longer confident that Booster 4 will be static fired before retirement. More to the point, it would be uncharacteristically risky behavior from SpaceX to perform the very first static fire of a new prototype with an already proven Starship sitting on top of it. An anomaly as small as an uncontrolled fire – far from uncommon for Starships – could easily risk the catastrophic destruction of both stages, which would itself run the risk of significantly damaging the orbital launch site, which could easily take months to repair.

Nonetheless, there’s still a chance. SpaceX has opportunities for additional testing on March 17th, 18th, 21st, and 22nd.

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Eric Ralph is Teslarati's senior spaceflight reporter and has been covering the industry in some capacity for almost half a decade, largely spurred in 2016 by a trip to Mexico to watch Elon Musk reveal SpaceX's plans for Mars in person. Aside from spreading interest and excitement about spaceflight far and wide, his primary goal is to cover humanity's ongoing efforts to expand beyond Earth to the Moon, Mars, and elsewhere.

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Elon Musk

Tesla says it is working on rides for the handicapped and disabled with Robotaxi

Tesla CEO Elon Musk confirmed that this was a focus by responding, “Absolutely,” to the embedded post on X above. Tesla said it is developing its own “wheelchair-accessible vehicle,” also known as a WAV. 

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10 hours ago

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September 20, 2025

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Credit: Teslarati

Tesla says on its Robotaxi app that it is working on enabling “accessibility rides” that would give the handicapped and disabled the ability to hail a Robotaxi to get to an appointment.

While Robotaxi will obviously revolutionize the way we travel for our work commutes, daily activities, and other things, but there is true potential to enable serious change for those who cannot drive.

Autonomous transportation would make life easier for those who are unable to obtain a driver’s license. Of course, with today’s ride-sharing platforms, things are much easier than they once were.

However, rides from Uber and Lyft, while plentiful, always have an opportunity to be unavailable in some regions, especially rural ones, due to a lack of drivers.

Robotaxi aims to solve this problem through autonomous transportation, a technology that Tesla has been developing for years.

However, new language in the Robotaxi app shows that Tesla is working on a solution for people who need rides for medical reasons, and it uses a picture of the Robovan to hammer this point home:

Tesla CEO Elon Musk confirmed that this was a focus by responding, “Absolutely,” to the embedded post on X above. Tesla said it is developing its own “wheelchair-accessible vehicle,” also known as a WAV.

This is likely the Robovan, which was unveiled on October 10 at the Robotaxi event last year:

Tesla unveils the Robovan at ‘We, Robot’ event

It is pretty interesting to see two Musk ventures working on solutions for those who are physically impaired or have other disabilities. With Tesla, Robotaxi will unlock immense potential for those who are unable to drive themselves, addressing a genuine need in today’s world.

Additionally, Neuralink is continuing its development of technology to fight against various physical and mental disabilities. A great question to ask is, “Which will be more beneficial for humans?”

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Cybertruck

Tesla gives big hint that it will build Cyber SUV, smaller Cybertruck

“Those are definitely things we’ve considered. Wait & see is probably the best way I can answer that. We’re working on so many innovative & fun things.”

Published

16 hours ago

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September 20, 2025

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Credit: @ApexRedPanda

Tesla appears to have given a significant hint that it plans to build two highly anticipated and requested vehicles: the Cyber SUV and a smaller Cybertruck. This potentially indicates that two new cars could be added to the lineup soon.

For some time, Tesla fans have been requesting two things: a true SUV and a more compact Cybertruck. The SUV has been on the minds of fans and owners for some time, as Tesla does not currently build a full-size SUV that competes with vehicles like the Chevrolet Tahoe or Ford Expedition.

Tesla’s longer Model Y did not scale back requests for this vehicle type from fans

Meanwhile, the compact and smaller Cybertruck has been teased for years, especially since the all-electric pickup seems to be a viable option for international markets; however, its size does not seem ideal for the tight roadways in other regions.

Lately, there have been more hints than ever that Tesla is finally considering these two vehicles. It’s all but confirmed, but Tesla has always left breadcrumbs for fans to find and speculate over.

In an interview with Bloomberg, Tesla Chief Designer Franz von Holzhausen said that the company has considered these two vehicles for its lineup, but he would not give a definitive “yes” or “no” regarding their development:

“Those are definitely things we’ve considered. Wait & see is probably the best way I can answer that. We’re working on so many innovative & fun things.”

Recently, the speculation regarding the Cyber SUV has been well-fueled, as a recent promotional video Tesla released seemed to show a mock-up design hiding in plain sight:

Credit: Tesla

Interestingly, Tesla said in a regulatory filing early this year that it would not adopt the Cybertruck’s stainless steel exoskeleton for new vehicles. However, it could still launch a design inspired by the Cybertruck, but using different materials.

As far as the more compact Cybertruck design, this would enable fans in Europe and Asia to purchase the all-electric pickup.

There have been concerns from a regulatory perspective in some countries outside of North America, as the sheer size and sharp edges have caused some concern for other governments:

Tesla Cybertruck gets pushback in Europe, increasing need for ‘international’ version

However, back in 2019, just after the Cybertruck’s unveiling, CEO Elon Musk admitted that there was a place for a smaller version.

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News

Tesla Robotaxi is headed to a new U.S. state following latest approval

“Only a trained employee, contractor, or other person authorized by the company can operate or monitor the vehicles.”

Published

21 hours ago

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September 20, 2025

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Credit: Joe Tegtmeyer | X

Tesla Robotaxi is headed to a new U.S. state following its latest approval, which was revealed on Friday night.

Tesla has been operating its Robotaxi platform in Texas and California, with Austin being the first city where the company could test a ride-hailing platform without anyone in the driver’s seat.

First launching in Austin in late June, Tesla’s focus has been expanding its service area, its fleet of Robotaxi vehicles, and its rider population, which has grown most recently due to its public launch.

However, Tesla is also filing applications in states where these autonomous driving programs can operate, aiming to expand to all 50 states eventually. CEO Elon Musk said earlier this year that the company should be able to offer Robotaxi rides to roughly half of the U.S. population.

Alongside Texas and California, Tesla recently gained permission to test its Robotaxi in Nevada, marking the third state where it had some form of regulatory permission to perform rides using an unreleased version of the Full Self-Driving suite.

Tesla adjusts one key detail of Robotaxi operations in Austin

Now, Tesla has gained another approval in a new state, its fourth, marking a significant step in its expansion across the U.S.

In Arizona, Tesla gained regulatory approval to begin testing autonomous vehicles on public roads.

The vehicles in Austin and the Bay Area of California both use what Tesla has been referring to as “Safety Monitors” in the cars. During city operation in Texas, the Safety Monitor sits in the passenger’s seat. When the route takes the car on the highway, the Safety Monitor jumps into the driver’s seat.

Tesla explains why Robotaxis now have safety monitors in the driver’s seat

In California, the Safety Monitor is always in the driver’s seat.

In Arizona, Tesla will also utilize what a communication said was “Safety Drivers,” insinuating that the monitor would be in the driver’s seat. However, another line in the email states:

“Only a trained employee, contractor, or other person authorized by the company can operate or monitor the vehicles.”

It sounds as if there is the potential for the Safety Monitor to be in either seat, much like Tesla’s process in Austin. However, this is currently unconfirmed.

The new approval marks a drastic step forward for Tesla as it has received two new approvals in just two weeks. Regulatory hurdles seem to still be the biggest bottleneck for Tesla in terms of gaining permissions to operate in new states, but things seem to be moving along pretty well so far.

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