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SpaceX wants to unleash Starhopper but longer Raptor test fires come first

SpaceX has reportedly fired a Raptor engine for more than 40 seconds, a necessary step along the path to untethered Starhopper test flights. (SpaceX & NASASpaceflight/bocachicagal)

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According to SpaceX CEO Elon Musk, the next round of Starhopper activity will focus on removing the spacecraft prototype’s tethers and performing far more substantial hop tests.

Longer tests demand that SpaceX begins expanding the known performance envelope of its full-scale Raptor engine. Towards that end, longer-duration tests would need to be done at the company’s McGregor, TX development facilities to reduce risk, tests that Musk confirmed are already well underway. A recent Raptor static fire reportedly lasted no less than 40 seconds, more than enough time for a single-engine Starhopper to significantly expand both the maximum altitude and velocity of future hop tests. In support of the upcoming Starhopper test campaign, significant construction work is also ongoing at SpaceX’s Boca Chica test and development facilities.

Starhopper awaits its return to hop testing, April 24th. (NASASpaceflight – bocachicagal)

Unleashing the Hopper

During the months of March and April, SpaceX’s South Texas team effectively completed Starhopper and put the prototype through its first real tests. The process began with tank proof tests in which Starhopper’s tanks were filled with liquid nitrogen – relatively neutral and unreactive – to safely identify and repair any leaks, while also subjecting the vehicle to cryogenic temperatures. The proof testing also put the newly installed ground systems (GSE) and vehicle-pad connection hardware through their paces before moving to Starhopper’s nominal liquid oxygen and liquid methane propellant.

Following at least half a dozen or so wet dress rehearsals (WDRs) that saw Starhopper loaded with LOx and methane, SpaceX technicians analyzed the health of the prototype and soon began live tests with a Raptor engine installed. Designed to produce no less than 2000 kN (450,000 lbf, 205 mT) of thrust at full throttle, Raptor offers more than twice the max thrust of the latest variant of the Merlin 1D engine that powers Falcon 9 and Heavy (941 kN or 212,000 lbf). In other words, a single Raptor should be more than enough to lift Starhopper off the ground 150+ tons of propellant aboard.

In the above tweets, Musk indicates that Starhopper’s next step will be untethered hop tests powered by one Raptor engine. This is further supported by confirmation that Raptor completed its longest static fire test yet on April 27th.

After several unsuccessful test attempts, Starhopper completed two static fires (<10s combined) and hopped – tethered – a handful of feet off the ground on April 3rd and 5th, three weeks after Raptor was first installed. Days later, the lone Raptor engine was removed from Starhopper and shipped back to SpaceX’s Hawthorne, CA factory or McGregor, TX testing facilities for post-test analysis and inspection. In short, SpaceX used Starhopper as a sort of ad hoc test stand for the second serial Raptor (SN02) produced, completing two major acceptance tests simultaneously.

A handful of concise tweets published by Musk in the last few days of April implicitly confirmed that the next steps for Starhopper involved untethered flights off its South Texas pad, once again powered by a single Raptor engine. As both the prospective altitudes and flight times rise for future Starhopper tests, so do the risks posed to SpaceX’s adjacent facilities and the prototype itself. To minimize those risks and progress the Raptor program as a whole, SpaceX has been extensively testing the third serial Raptor (SN03) at its McGregor facilities. Instead of a rushed test regime similar to the one that almost completely destroyed Raptor SN01 less than two weeks after testing began, SN03 is participating in a more cautious and systematic series of tests.

Technicians work inside Starhopper’s LOx tank on April 22nd. (NASASpaceflight – bocachicagal)
While almost impossible to visualize the changes from a flat perspective, several dozen trucks of dirt and concrete were delivered to Starhopper’s pad last week. (NASASpaceflight – bocachicagal)

Confirmed by Elon Musk, this included significantly increasing the length of Raptor SN03’s latest static fires, culminating in an April 27th test that lasted ~40 seconds. Above all else, long test fires are necessary to demonstrate that Raptor can reliably operate for dozens of seconds at a time, given that any failure leading to a loss of thrust could cause Starhopper – basically a controlled explosive device – to fall out of the sky. The famous Musk/SpaceX ethos of moving fast and breaking things does not preclude a pragmatic attitude towards the destruction of facilities and prototypes that could take months and millions of dollars to rebuild.

The ETA of future hop tests is unclear. For the time being, it appears that SpaceX’s South Texas facilities will be caught up in construction work for at least another week. Whether or not Raptor SN03 is next in line for installation on Starhopper, SpaceX will likely put it through several more long-duration static fires before moving ahead with untethered hop tests. All things considered, the rough Starship prototype is unlikely to restart powered testing for another two or so weeks. Stay tuned!

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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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Watch the first true Tesla Robotaxi intervention by safety monitor

Watch the first Tesla Robotaxi intervention by a safety monitor.

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Credit: Dave Lee

Nearly 60 hours into the launch of the Tesla Robotaxi platform, it appears we have our first true intervention that required the in-car safety monitor to intervene.

We’ve seen and heard about a handful of minor issues with the Robotaxi fleet thus far, one of which included a risky, but very human-like behavior of navigating across yellow lines to a turn lane after missing a turn.

While that is not necessarily a legal maneuver, it is something that you’d see commonly from human drivers, and although aggressive, it is sometimes reasonable to perform depending on traffic conditions.

For what it’s worth, the car seemed very confused by the situation, and while the safety monitor did not get involved and the car handled the situation with no real issue, it is something as a rider you’d like to see less of.

First Look at Tesla’s Robotaxi App: features, design, and more

As previously stated, that specific example did not require any intervention by a safety monitor. On Tuesday, we saw a video of the first true intervention that required the safety monitor who sits in the passenger seat to intervene by pressing a button on the center touchscreen.

During a ride that Tesla investor and YouTuber Dave Lee was taking in Austin in a Robotaxi, the vehicle seemed to get a little confused by a UPS truck that was parallel parking in front of it. The monitor pressed the “Stop in Lane” button on the touchscreen:

This appears to be one of the first errors shared by Tesla Robotaxi Early Access Program users that required the monitor to actually intervene. We have not seen any of it yet. You could also see the UPS truck is also a bit at fault here, as the space it pulled into did not seem even remotely large enough to fit the entire vehicle.

The car may not have anticipated that the truck would park there. You can see how the UPS truck was parked below, and it seems reasonable that the Tesla might not have thought it would attempt to fit there:

Credit: Dave Lee

The Model Y’s steering wheel was also turning sharply right into this spot, it appears. Dave ended his ride here, and stated that this was his dropoff spot. The UPS truck might have just cut off the Tesla, which led to the intervention.

It is a testament to Tesla’s strategy with this Robotaxi rollout. The company is obviously confident enough in the Full Self-Driving suite that it does not feel a human needs to be in the driver’s seat. However, it is still requiring someone, as of now, to sit in the passenger’s seat for instances just like this one.

Safety is the company’s priority with the launch of Robotaxi, and CEO Elon Musk has reiterated that. It is expected that we’d eventually see some kind of intervention that requires a monitor to step in. Everyone was safe.

Obviously, these things happen with autonomous vehicles. We’ve seen Waymos get stuck at intersections in very strange scenarios at times:

It is proof that autonomous tech is still in a growth phase and engineers are still learning about its capabilities. Tesla and other companies will learn from these rare cases and become better companies, and offer safer technologies because of it.

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Tesla removed from Charlotte’s approved EV list due to ‘safety issues’

City reps say it’s not because of Elon Musk’s political involvement, but instead because of safety issues.

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Credit: Tesla

Tesla has been removed from the Charlotte, North Carolina, City Council’s list of pre-approved electric vehicles that the city can purchase.

It’s not because of Elon Musk, Democratic council member LaWana Mayfield said, who urged her colleagues to remove Tesla. Instead, she claims it is because of “safety issues.”

She said (via WFAE):

“So it is not just the particular owner of this product. It is the fact that this product has been in multiple lawsuits because of safety issues, and there are multiple concerns.”

Recent data from Tesla shows that its vehicles are about half as likely to be involved in an accident when being driven normally. When Autopilot technology is used, it is about ten times safer than the average driver in the U.S., statistically.

Tesla Vehicle Safety Report shows Autopilot is 10x better than humans

Republican City Council member Ed Driggs stood up for Tesla, saying that:

“I think we just set a dangerous precedent if we have reasons that aren’t related to the cost and the performance of purchased items for excluding them. We already have Teslas in the fleet.”

If they’re so dangerous, why are they already in the fleet?

The NHTSA also shows that Ford is the most recalled car company in 2025, with 81 total recalls. Tesla has just five for the year.

Driggs said to Mayfield during the meeting:

“We are not identifying names on this list. You are singling out one name on this list for political reasons. You don’t have enough data on Tesla compared to the other car companies to suggest they shouldn’t be here. I object to trying to disguise this as anything other than a politically motivated desire to not have this name on this list.”

Tesla was successfully removed by a 6-3 vote. Democrats Danté Anderson, Malcolm Graham, Renee Johnson, Victoria Watlington, and Tiawana Brown supported Tesla’s removal. Republican Edwin Peacock, along with Driggs and Democrat Dimple Ajmera, all voted no on removing Tesla.

The City of Charlotte will buy 45 new electric vehicles, and Teslas would likely be the best option. Many local law enforcement agencies across the U.S. have utilized them and have shown that the vehicles contribute to massive maintenance and cost of ownership reductions due to the lack of overall upkeep.

Tesla police fleet is saving taxpayers $80k per year on fuel costs: report

This is not the first time that a city in the U.S. has chosen to go in a different direction with its EV fleet plans. Tesla was chosen over Ford by the City of Baltimore for a $5 million expenditure that would bolster its fleet with EVs.

However, earlier this year, Baltimore said it “decided to go in a different direction,” and although it was not directly confirmed, the move seemed to be political.

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Tesla threatened in France with claims of ‘deceptive’ practices

Tesla has been threatened by the Competition, Consumer Affairs, and Fraud Control Office in France after the agency said it is participating in “deceptive business practices” related to its semi-autonomous driving capabilities.

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tesla side repeater camera
(Credit: Tesla)

Tesla has been threatened by the Competition, Consumer Affairs, and Fraud Control Office in France after the agency said it is participating in “deceptive business practices” related to its semi-autonomous driving capabilities.

Investigators in the government office said that Tesla has engaged in deceptive commercial practices over the capabilities of its cars. In the past, other agencies and even some skeptics have said that Tesla’s use of the phrases “Autopilot” and “Full Self-Driving” is inaccurate in terms of its capabilities.

Tesla Autopilot gets stone cast in its direction by Pete Buttigieg

However, Tesla has been transparent with consumers and regulatory agencies that its cars are not yet fully autonomous, meaning drivers could sleep, play on their phones, or pay no attention to the road. The car would take care of steering and speed.

Tesla has never maintained that its cars are capable of this. On its website and in its Owner’s Manuals, it says that drivers are required to pay attention and be prepared to take over in case of an emergency.

The office began the investigation back in 2023 and, this week, ordered Tesla to comply with regulations within the next four months. If it does not, it will face fines of €50,000 per day.

This is not the first time Tesla has had some pushback from regulators regarding the naming of its semi-autonomous driving platforms. Back in 2023, then Secretary of Transportation in the United States, Pete Buttigieg, said the name “Autopilot” was not accurate because it is still a hands-on system:

“I don’t think that something should be called, for example, an Autopilot, when the fine print says you need to have your hands on the wheel and eyes on the road at all times. We call balls and strikes. I view it as something where it’s very important to be very objective. But anytime a company does something wrong or a vehicle needs to be recalled or a design isn’t safe, we’re going to be there.”

He then said that Autopilot and its interaction with the person operating the car is a “real concern.”

 

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