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SpaceX delays Starhopper’s first flight a few days despite Raptor preburner test success

According to NASASpaceflight.com, SpaceX's Starhopper successfully completed a Raptor preburner taste on July 15th. A static fire ignition test should follow on July 16th.(NASASpaceflight - bocachicagal)

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SpaceX has (partially) ignited Starhopper’s freshly-installed Raptor engine, successfully verifying that the engine is ready for its next major test: a full ignition and static firing. Although successful, SpaceX still has some work to do before the vehicle is ready for its first untethered flight(s).

July 15th’s progress is just the latest in a several day-series of preflight tests designed to reduce the likelihood that Starhopper is destroyed over the coming days and (hopefully) weeks. If all goes planned during the awkward Starship prototype’s first foray into hover tests, SpaceX CEO Elon Musk has stated that he will provide an official presentation updating the public on the status of the company’s ever-changing next-generation rocket.

The past week or so of Starhopper preflight testing began with Raptor serial number 6 (SN06) completing the last of a series of acceptance test fires in McGregor, Texas on June 10th. Even on its own, this was a major milestone for the new SpaceX engine: Raptor SN06 was the first of the new, full-scale engines to pass the acceptance test program with flying colors. According to Musk, for the engine to complete those tests so successfully, SpaceX had to solve a challenging bug in which some sort of mechanical resonance (i.e. vibration) damaged or destroyed Raptors SN01-05.

Hours later, the engine began a short ~450 mi (720 km) journey south to Starhopper, located in Boca Chica, Texas. The engine arrived on July 11th and was fully installed on Starhopper by the following evening (July 12th), at which point SpaceX put Starhopper and Raptor through some mild but valuable thrust vector controller (TVC) tests, wiggling the car-sized engine to ensure it can accurately steer the prototype rocket.

Around two days after the above ‘wiggle’ test was successfully completed, SpaceX moved into the next stage, partially fueling Starhopper with liquid methane and oxygen propellant and helium pressurant in what is known in rocketry as a wet dress rehearsal (WDR). The (implicitly) successful WDR was capped off with a duo of what can now safely be concluded were some sort of Raptor test preceding even pre-ignition operations. Whatever the tests were, they appear to have been completed successfully.

That appears to be the case because less than 24 hours after their completion, on July 15th, SpaceX once again began loading Starhopper with propellant and pressurant for a second round of wet testing. This time around, SpaceX got right into more critical Raptor tests once enough propellant was loaded, igniting the engine’s interwoven oxygen and methane preburners.

Starhopper (technically) came alive for the third time ever on July 15th, albeit only partially. SpaceX ignited the engine’s preburners as a precursor to a full static fire, now NET July 16th. (LabPadre – YouTube livestream)

Previously discussed 24 hours ago in a Teslarati article focused on Raptor wiggles and other miscellaneous tests, Raptor is an extremely advanced rocket engine based on a cycle (i.e. how propellant is turned into thrust) known as full-flow staged combustion.

In a staged-combustion engine like Raptor, getting from the supercool liquid oxygen and methane propellant to 200+ tons of thrust is quite literally staged, meaning that the ignition doesn’t happen all at once. Rather, the preburners – essentially their own, unique combustion chambers – ignite an oxygen- or methane-rich mixture, the burning of which produces the gas and pressure that powers the turbines that bring fuel into the main combustion chamber. That fuel then ignites, producing thrust as they exit the engine’s bell-shaped nozzle.

Unintuitively, conditions inside the preburner – hidden away from view – are actually far more intense than the iconic blue, purple, and pink flame that visibly exists Raptor’s nozzle. Much like hot water will cool while traveling through pipes, the superheated gaseous propellant that Raptor ignites to produce thrust will also cool (and thus lose pressure) as it travels from Raptor’s preburner to its main combustion chamber. If the pressure produced in the preburners is too low, Raptor’s thrust will be (roughly speaking) proportionally limited at best. At worst, low pressure in the preburners can trigger a “hard start” or shutdown that could destroy the engine. According to Elon Musk, Raptor’s oxygen preburner thus has the worst of it, operating at pressures as high or higher than 800 bar (11,600 psi, 80 megapascals).”

In full-flow staged combustion (FFSC), even more complexity is added as all propellant that touches the engine must necessarily end up traveling through the main combustion chamber to eke every last ounce of thrust out of the finite propellant a rocket lifts off with. As such, FFSC engines can be about as efficient as the laws of physics allow any given chemical rocket engine to be, at the cost of exceptional complexity and brutally difficult development.

Additionally, FFSC physically requires two separate preburners and then makes things even harder by making each separate preburner (methane and oxygen) depend on each other’s operation for the engine to fully ignite. This means that no individual preburner can be used to kickstart Raptor – instead, SpaceX must somehow spin the turbopumps that feed propellant into each preburner with some separate system. This is all just to emphasize the fact that Raptor’s ignition sequence is a spectacularly complex orchestra of valves, spark plugs, sensors, and magic. This is why it’s valuable for Raptor to test its preburner system independently of an actual ignition test, at least as long as the engine is still in the development stages.

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A Raptor engine is pictured here during a static fire test in McGregor, Texas. (SpaceX)

According to NASASpaceflight.com managing editor Chris Bergin, what this practically translates to is a minor Starhopper hover test delay of 1-2 days, while the static fire has also been pushed roughly 24 hours from July 15th to July 16th. If that full static fire produces lots of happy data, Starhopper could be cleared for a hover test debut attempt as early as Wednesday or Thursday (July 17/18).

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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 UK sales see 14% year-over-year rebound in June: SMMT data

The SMMT stated that Tesla sales grew 14% year-over-year to 7,719 units in June 2025.

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Credit: Tesla

Tesla’s sales in the United Kingdom rose in June, climbing 14% year-over-year to 7,719 units, as per data from the Society of Motor Manufacturers and Traders (SMMT). The spike in the company’s sales coincided with the first deliveries of the updated Model Y last month.

Model Y deliveries support Tesla’s UK recovery

Tesla’s June performance marked one of its strongest months in the UK so far this year, with new Model Y deliveries contributing significantly to the company’s momentum. 

While the SMMT listed Tesla with 7,719 deliveries in June, independent data from New AutoMotive suggested that the electric vehicle maker registered 7,891 units during the month instead. However, year-to-date figures for Tesla remain 2% down compared to 2024, as per a report from Reuters.

While Tesla made a strong showing in June, rivals are also growing. Chinese automaker BYD saw UK sales rise nearly fourfold to 2,498 units, while Ford posted the highest EV growth among major automakers, with a more than fourfold increase in the first half of 2025.

Overall, the UK’s battery electric vehicle (BEV) demand surged 39% to to 47,354 units last month, helping push total new car sales in the UK to 191,316 units, up 6.7% from the same period in 2024.

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EV adoption accelerates, but concerns linger

June marked the best month for UK car sales since 2019, though the SMMT cautioned that growth in the electric vehicle sector remains heavily dependent on discounting and support programs. Still, one in four new vehicle buyers in June chose a battery electric vehicle.

SMMT Chief Executive Mike Hawes noted that despite strong BEV demand, sales levels are still below regulatory targets. “Further growth in sales, and the sector will rely on increased and improved charging facilities to boost mainstream electric vehicle adoption,” Hawes stated.

Also taking effect this week was a new US-UK trade deal, which lowers tariffs on UK car exports to the United States from 27.5% to 10%. The agreement could benefit UK-based EV producers aiming to expand across the country.

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Tesla Model 3 ranks as the safest new car in Europe for 2025, per Euro NCAP tests

Despite being on the market longer than many of its rivals, the Tesla Model 3 continues to set the bar for vehicle safety.

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Credit: Tesla Asia/X

The Tesla Model 3 has been named the safest new car on sale in 2025, according to the latest results from the Euro NCAP. Among 20 newly tested vehicles, the Model 3 emerged at the top of the list, scoring an impressive 359 out of 400 possible points across all major safety categories.

Tesla Model 3’s safety systems

Despite being on the market longer than many of its rivals, the Tesla Model 3 continues to set the bar for vehicle safety. Under Euro NCAP’s stricter 2025 testing protocols, the electric sedan earned 90% for adult occupant protection, 93% for child occupant protection, 89% for pedestrian protection, and 87% for its Safety Assist systems.

The updated Model 3 received particular praise for its advanced driver assistance features, including Tesla’s autonomous emergency braking (AEB) system, which performed well across various test scenarios. Its Intelligent Speed Assistance and child presence detection system were cited as noteworthy features as well, as per a WhatCar report.

Other notable safety features include the Model 3’s pedestrian-friendly pop-up hood and robust crash protection for both front and side collisions. Euro NCAP also highlighted the Model 3’s ability to detect vulnerable road users during complex maneuvers, such as turning across oncoming traffic.

Euro NCAP’s Autopilot caution

While the Model 3’s safety scores were impressive across the board, Euro NCAP did raise concerns about driver expectations of Tesla’s Autopilot system. The organization warned that some owners may overestimate the system’s capabilities, potentially leading to misuse or inattention behind the wheel. Even so, the Model 3 remained the highest-scoring vehicle tested under Euro NCAP’s updated criteria this year.

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The Euro NCAP’s concerns are also quite interesting because Tesla’s Full Self-Driving (FSD) Supervised, which is arguably the company’s most robust safety suite, is not allowed for public rollout in Europe yet. FSD Supervised would allow the Model 3 to navigate inner city streets with only minimal human supervision.

Other top scorers included the Volkswagen ID.7, Polestar 3, and Geely EX5, but none matched the Model 3’s total score or consistency across categories. A total of 14 out of 20 newly tested cars earned five stars, while several models, including the Kia EV3, MG ZS, and Renault 5, fell short of the top rating.

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Why Tesla’s Q3 could be one of its biggest quarters in history

Tesla could stand to benefit from the removal of the $7,500 EV tax credit at the end of Q3.

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(Credit: Tesla)

Tesla has gotten off to a slow start in 2025, as the first half of the year has not been one to remember from a delivery perspective.

However, Q3 could end up being one of the best the company has had in history, with the United States potentially being a major contributor to what might reverse a slow start to the year.

Earlier today, the United States’ House of Representatives officially passed President Trump’s “Big Beautiful Bill,” after it made its way through the Senate earlier this week. The bill will head to President Trump, as he looks to sign it before his July 4 deadline.

The Bill will effectively bring closure to the $7,500 EV tax credit, which will end on September 30, 2025. This means, over the next three months in the United States, those who are looking to buy an EV will have their last chance to take advantage of the credit. EVs will then be, for most people, $7,500 more expensive, in essence.

The tax credit is available to any single filer who makes under $150,000 per year, $225,000 a year to a head of household, and $300,000 to couples filing jointly.

Ending the tax credit was expected with the Trump administration, as his policies have leaned significantly toward reliance on fossil fuels, ending what he calls an “EV mandate.” He has used this phrase several times in disagreements with Tesla CEO Elon Musk.

Nevertheless, those who have been on the fence about buying a Tesla, or any EV, for that matter, will have some decisions to make in the next three months. While all companies will stand to benefit from this time crunch, Tesla could be the true winner because of its sheer volume.

If things are done correctly, meaning if Tesla can also offer incentives like 0% APR, special pricing on leasing or financing, or other advantages (like free Red, White, and Blue for a short period of time in celebration of Independence Day), it could see some real volume in sales this quarter.

Tesla is just a shade under 721,000 deliveries for the year, so it’s on pace for roughly 1.4 million for 2025. This would be a decrease from the 1.8 million cars it delivered in each of the last two years. Traditionally, the second half of the year has produced Tesla’s strongest quarters. Its top three quarters in terms of deliveries are Q4 2024 with 495,570 vehicles, Q4 2023 with 484,507 vehicles, and Q3 2024 with 462,890 vehicles.

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