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SpaceX crushes rocket engine world record during Raptor test

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CEO Elon Musk has revealed that SpaceX crushed a global rocketry record during a recent Raptor engine test, pushing the crucial Starship component past years-old performance targets.

On August 17th, the SpaceX CEO unexpectedly released a photo of a Raptor test and a corresponding graph showing the engine’s chamber pressure, confirming that the company had successfully pushed the engine to record-breaking levels. Musk says that an unspecified Raptor – possibly serial number 39 (SN39) – briefly reached a main combustion chamber pressure of 330 bar (~4800 psi) during a controlled burn – and remained intact after shutdown.

Outside of subscale laboratory tests, the highest main combustion chamber known to full-scale, orbital-class rocketry was achieved by the Soviet Union in the 1980s with the RD-701 engine. Although the exceptionally unique engine was canceled before it could be used, it reportedly reached pressures of 290-300 bar in one mode of operation. Now, however, SpaceX and its Raptor engine appear to be the new world record holders – and by a huge margin.

SpaceX’s Raptor engine (right) appears to have stolen the crown of RD-701, a ~35-year-old Soviet engine and technological marvel. (SpaceX)

Raptor’s new crown comes roughly 18 months after Elon Musk revealed that the engine had beaten the Soviet RD-270 full-flow staged combustion (FFSC) with a higher sustained chamber pressure (~257 bar vs 255 bar). A few days later, the same Raptor went even further, cresting the Russian RD-180 engine’s 257 bar operating pressure with a peak of 268 bar. Still, SpaceX needed 6-12 more months to refine Raptor into an engine capable of operating even close to those pressures for more than ~10 seconds. In July and August 2019, Raptor engine SN6 flew twice on Starhopper, culminating in a ~60-second, 150-meter hop that ended with the engine nearly destroying itself seconds before landing.

Almost exactly one year later, Raptor SN27 launched on Starship SN5 on the same 150m trajectory and appeared to perform flawlessly. Exhibiting barely a stutter or flare, SN27 never came close to the flamethrower-like death throes Raptor SN6 suffered in August 2019. In short, SpaceX continued to do what SpaceX does best, continuously refining rough prototypes into increasingly polished end products.

Originally revealed in 2016 as a methane/oxygen full-flow staged combustion engine with an operating combustion chamber pressure of 300 bar (4350 psi), Raptor’s August 17th achievement means that SpaceX has already exceeded one of its performance goals. Of course, combustion chamber pressure is significant but still far less important than engine longevity, burn duration limits, and reusability in the context of Starship. SpaceX likely wouldn’t be pushing the envelope of chamber pressure if it wasn’t confident about Raptor’s many other important attributes, but it’s still unknown if Raptor has ever burned for longer than ~90 seconds.

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Regardless, if Raptor can actually sustain chamber pressures of 330 bar without damaging itself, the milestone could mean that SpaceX has already boosted Raptor’s maximum thrust from ~200 metric tons to ~225 metric tons (440,000-500,000 lbf. For Starship and Super Heavy, that 10% increase in thrust could easily translate to a 5-10% increase in payload to orbit per launch.

A senior SpaceX engineer and executive believes that Starship’s first orbital launch could still happen by the end of the 2020. (SpaceX)

To reach orbit, though, Raptor still has a ways to go. For Super Heavy to be able to complete a normal launch, SpaceX will need to dramatically expand Raptor production (~31 engines per booster) and ensure that Raptor can reliably operate for 3-5+ minutes and reignite multiple times in flight. For Starship, SpaceX needs – at the minimum – to mature Raptor until it can burn continuously for 5-10 minutes to reach orbit. The company will likely also need to finish developing a custom vacuum-optimized version of Raptor for efficient orbital Starship flights.

Given just how quiet SpaceX is about most Raptor milestones, there’s a chance the company has already made substantial progress along those lines. For example, Starship SN8 – already well on its way to completion – will likely be the first prototype to fly with three Raptor engines and will need the ability to stop and start those engines in-flight to perform full-fidelity 20 km (~12.5 mi) launch and landing tests. Even just sustaining 330 bar for 10-100+ seconds without destroying the engine is likely several Raptor iterations away. Still, given SpaceX’s track record, all of those milestones are likely just a matter of time and perseverance.

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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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Tesla robotaxi test details shared in recent report: 300 operators, safety tests, and more

Tesla has launched an initial robotaxi service for its employees in Austin and the San Francisco Bay Area.

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Credit: Tesla

During the Q1 2025 earnings call, Tesla executives reiterated the idea that the company will be launching a dedicated robotaxi service using its Full Self Driving (FSD) Unsupervised system this coming June.

A recent report from Insider, citing people reportedly familiar with the matter, has now provided a number of details about the preparations that Tesla has been making as it approaches its June target date.

Remote Operators

As noted by the publication, about 300 test operators have been driving through Austin city streets over the past few months using Teslas equipped with self-driving software. These efforts are reportedly part of “Project Rodeo.” Citing test drivers who are reportedly part of the program, Insider noted that Tesla’s tests involve accumulating critical miles. Test drivers are reportedly assigned to specific test routes, which include “critical” tracks where drivers are encouraged to avoid manual interventions, and “adversarial” tracks, which simulate tricky scenarios.

Tesla has launched an initial robotaxi service for its employees in Austin and the San Francisco Bay Area, though the vehicles only operate in limited areas. The vehicles also use safety drivers for now. However, Tesla has reportedly had discussions about using remote operators as safety drivers when the service goes live for consumers. Some test drivers have been moved into remote operator roles for this purpose, the publication’s sources claimed.

While Tesla is focusing on Austin and San Francisco for now, the company is reportedly also deploying test drivers in other key cities. These include Atlanta, GA, New York, NY, Seattle, WA, and Phoenix, AZ.

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Safety Tests

Tesla reportedly held training events with local first responders as part of its preparations for its robotaxi service, Insider claimed, citing documents that it had obtained. As per the publication, Tesla had met with the city’s autonomous vehicle task force, which include members of the Austin Fire Department, back in December.

Back in March, Tesla reportedly participated in about six hours of testing with local first responders, which included members of the fire department and the police, at a close test track. Around 60 drivers and vehicles were reportedly used in the test to simulate real-world traffic scenarios. 

Interestingly enough, a spokesperson from the Austin Police Department stated that Tesla did hold a testing day with emergency responders from Austin, Williamson County, as well as the Texas Department of Public Safety.

Reported Deadlines

While Tesla has been pretty open about its robotaxi service launching in Austin this June, the company is reportedly pursuing an aggressive June 1 deadline, at least internally. During meetings with Elon Musk, VP of AI software Ashok Elluswamy’s team reportedly informed the CEO that the company is on track to hit its internal deadline.

One of Insider’s sources, however, noted that the June 1 deadline is more aspirational or motivational. “A June 1 deadline makes a June 30 launch more likely,” the publication’s source noted.

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Atty who refused to charge six-time Tesla vandal sparks controversy

Despite the multiple offenses, Moriarty opted to enter Adams into an adult diversion program instead.

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Pilottap, CC0, via Wikimedia Commons

Hennepin County Attorney Mary Moriarty, who made the decision not to charge 33-year-old vandal Dylan Bryan Adams after he keyed six Teslas around Minneapolis last month, has found herself in the middle of controversy

The controversy came amidst her decision to press charges against a 19-year-old first-time vandal who keyed one vehicle at the White Castle in Brooklyn Park.

The Tesla Vandal

Moriarty’s decision not to charge Adams after he keyed six Teslas was met with widespread criticism. Adams’ actions resulted in more than $20,000 worth of damages, more than $10,000 of which was to a single vehicle, as noted in a New York Post report. Yet despite the multiple offenses, Moriarty opted to enter Adams into an adult diversion program instead.

The fact that Adams is a state employee who works for the Department of Human Services as a program consultant triggered allegations that his dismissal might be partly influenced by Gov. Tim Walz. Walz is a staunch critic of Musk, previously stating that the falling price of TSLA stock gives him a “boost” in the morning.

As noted in a report from The Minnesota Star Tribune, Moriarty’s decision was so controversial that she was asked about the matter on Wednesday. In response, the attorney argued that her office made the decision outside of any political consideration. “We try to make decisions without really looking at the political consequences. Can we always predict how a story will be portrayed in the media or what people will say? No,” Moriarty stated.

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Actually Charged

As noted by the Tribune, Moriarty has made arguments around the fact that Adams was a first-time offender, even if he opted to deface six separate Teslas. But even this argument has become controversial since Moriarty recently charged a 19-year-old Robbinsdale woman with no criminal record with first-degree felony property damage after she allegedly keyed a co-worker’s car. The damage incurred by the 19-year-old woman was $7,000, substantially less than the over $20,000 damage that Adams’ actions have caused.

Cases surrounding felony first-degree property damage are fairly common, though they require the damage to be over $1,000. The 19-year-old’s damage to her co-worker’s car met this threshold. Adams’ damage to the six Teslas he vandalized also met this requirement.

When Moriarty was asked about her seemingly conflicting decisions, she noted that her office’s primary goal was to hold the person accountable for keying the vehicle and get restitution to the people affected. She also noted that her office tries to avoid convictions when possible since they could affect a person’s life. “Should we have treated this gentleman differently because it’s a political issue? We made this decision because it is in the best interest of public safety,” she noted.

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Tesla faces emission credits tax in Washington state

House Bill 2077 taxes emissions credits, mainly hitting Tesla. Lawmakers expect $100M/year from the taxes.

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(Credit: Tesla)

Washington state lawmakers are advancing a bill that would tax Tesla’s emission credits, targeting profits under the state’s clean vehicle policy. Lawmakers who support the bill clarify that the Tesla credit tax is unrelated to Elon Musk.

HB 2077, introduced in mid-April, seeks to impose a 2% tax on emission credit sales and a 10% tax on banked credits. The bill primarily affects Tesla due to exemptions for companies with fewer credits.

In 2022, Washington’s Department of Ecology mandated that all new cars sold by 2035 be electric, hydrogen-fueled, or hybrids, with 35% compliance required by next year. Carmakers selling more gas-powered vehicles can buy credits from companies like Tesla, which sells only electric vehicles.

A legislative fiscal analysis projects taxes on those credits would generate $78 million in the 2025-27 biennium and $100 million annually thereafter. About 70% of the taxes will be allocated to the state’s general funds, and the rest will help expand electric car infrastructure.

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HB 2077 passed the state House eight days after its introduction and awaits a Senate Ways and Means Committee vote on Friday. At a House Finance Committee hearing, supporters, including union and social service advocates, argued the tax would prevent cuts to state services.

House Majority Leader Joe Fitzgibbon emphasized its necessity amid frozen federal EV infrastructure funds. “We didn’t have a budget crisis until this year. And we didn’t have the federal government revoking huge amounts of federal dollars for EV infrastructure,” he said.

Tesla’s lobbyist, Jeff Gombosky, countered that the proposal “runs counter to the intent” of the state’s zero-emission policy. Rivian’s lobbyist, Troy Nichols, noted a “modest” impact on his company but warned it could undermine the EV mandate. Kate White Tudor of the Natural Resources Defense Council expressed concerns, stating, “We worry it sets a dubious precedent.”

Fitzgibbon defended the tax, noting Tesla’s dominant credit stockpile makes it “one outlier” that is “very profitable.” “That’s the kind of thing legislators take an interest in,” he said. “Is it serving the interest of the public for this asset to be untaxed?”

With the legislative session nearing its end, the bill remains a key focus in budget talks in Washington.

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