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

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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Rivian grapples with challenges from Trump’s auto tariffs
Rivian CEO warns Trump’s auto tariffs will squeeze the EV industry. Scaringe says auto tariffs threaten rising costs & slower production.

Rivian is grappling with challenges arising from President Trump’s auto tariff. Rivian CEO RJ Scaringe recently enumerated the difficulties automakers face and elaborated on the impact of Trump’s auto tariffs on the electric vehicle (EV) industry.
President Trump’s auto tariffs were announced last month, imposing 25% tariffs on imported vehicles effective April 3, 2025, and levies on auto parts starting in May.
Scaringe talked a bit about the complexity of the automotive supply chain with Fox Business. Rivian’s R1T pickup, R1S SUV, and commercial electric van are manufactured at its Normal, Illinois plant. Scaringe boasted that Rivian has a “very U.S.-centric supply chain.
Yet, the complex global supply chain poses hurdles for U.S. automakers who want to comply with Trump’s auto tariffs.
“One of the things with automotive is the supply chain is so complex, where we have hundreds of suppliers providing parts from, say, a headlight or a tow hook or tires or the structure under the skin here that are coming from not only a set of suppliers that supply to us, but those suppliers have suppliers, and then in turn, those suppliers have suppliers, so there’s tier two, tier three,” Scaringe explained.
China’s restrictions on rare-earth material exports–in response to Trump’s 145% tariff on Chinese imports–further complicate matters. Rare-earth materials are critical for EV motor magnets and batteries. Nearly all rare-earth materials are processed exclusively in China.
“The trade restrictions and what we’re seeing in terms of rare earth metals out of China, that’s a real challenge for electric vehicles,” Scaringe noted.
Batteries comprise up to 40% of an EV’s cost. Goldman Sachs noted that battery costs have been falling in recent years. The investment bank estimated EV battery costs would drop by 50% between 2023 and 2026. However, China’s decision to restrict rare-earth materials may increase battery costs.
Wedbush analyst Dan Ives called the tariffs a source of “pure chaos” for the auto industry, stating, “A U.S. car made entirely with U.S. parts is a fictional tale.”
Ives warned automakers could increase car prices between $5,000 to $10,000. Wedbush predicts a potential change in Trump’s auto parts tariffs could ease disruptions.
For Rivian, starting prices near $70,000 limit room for cost increases without impacting sales. As trade tensions escalate, Rivian faces rising costs and potential production slowdowns, threatening its growth in a shifting EV landscape.
News
New Starlink router gets FCC approval, hints at dish upgrades
The new Starlink router hints at upcoming dish upgrades & faster service. SpaceX is setting the stage for 2 Gbps internet

SpaceX’s new Starlink router, model UTR-251, has secured FCC approval for U.S. sales. The new Starlink router hints at upcoming dish upgrades and improvements to SpaceX’s satellite internet service.
Starlink’s new router design and specs suggest ties to an updated high-performance dish or a new Starlink product. The UTR-251 succeeds the Gen 3 router (UTR-231 and UTR-232), launched in 2023.
Unlike its predecessor’s dual Ethernet ports, Starlink’s new router features a single port designed for “Indoor Use only,” with a vertical form resembling the Gen 2 router. FCC filings reveal WiFi 6 support and a higher “watt output” for expanded frequencies, including the 5.9GHz UNII-4 band, enhancing spectrum access.
Tim Belfall, a director at UK-based Starlink installer Westend WiFi, noted the router’s lower power needs. The new Starlink router needs a 9 Volt by 1.6 Amp, 14.4-watt input, compared to the Gen 3’s higher demands. The new router has significantly lower power requirements than the current Gen 3 router, suggesting compatibility with a smaller Starlink dish.
SpaceX is developing three new dish models, including a refreshed flat high-performance dish for enterprise users. Ukrainian engineer Oleg Kutkov noticed recent code changes in Starlink dishes, which he believes means SpaceX is ready to produce its high-performance dish.
In a webinar last month, SpaceX teased a new Starlink dish promising gigabit internet speeds, far surpassing the current average. SpaceX President Gwynne Shotwell highlighted the upgrade in 2024, stating, “Next generation, we’ll have smaller beams, more capacity per beam, lower latency.” She projected speeds up to 2 gigabits with the next-gen dish, positioning Starlink as a leader in high-speed satellite internet.
The UTR-251’s approval marks a step toward SpaceX’s vision of enhanced connectivity, though its exact role remains unclear. As SpaceX refines its hardware, the router’s advanced specs and efficiency underscore its push for faster, more reliable internet.
News
Swedish unions upset after Tesla opens two new Superchargers
Tesla seems to be getting better at overcoming the unions’ blockades.

Tesla Sweden is still dealing with a number of strikes due to its conflict with IF Metall, but the electric vehicle maker seems to be getting better at overcoming the unions’ efforts.
Tesla’s clever workarounds have resulted in network owner Telge Nät apologizing to the unions after two new Superchargers were opened despite the sympathy strikes of the Elektrikerna union and Seko.
Tesla Sweden’s New Superchargers
While Tesla’s main conflict in Sweden is with trade union IF Metall, a number of other unions have initiated sympathy strikes against the company. These include the Elektrikerna union and Seko, both of which have initiated efforts to block the launch of new Superchargers.
As noted in a CarUp report, however, Tesla Sweden recently opened two new Supercharger locations in the city of Södertälje. The first was a site with 16 Supercharger stalls in the Moraberg shopping area, and it was followed by a large 20-stall Supercharger at Vasa Handelsplats. The new Superchargers were appreciated by EV owners, as even non-Teslas use them, and they are among the most reliable and most affordable in the market.
Tesla Sweden celebrated the launch of its two new Superchargers in the country. “Södertälje is a long-awaited destination for fast charging, and Tesla’s two new stations enable comfortable, fossil-free, and economical trips between the east and west coasts and to southern Sweden,” the electric vehicle maker stated.
Angry Unions and Apologies
The unions were not happy at all that Tesla Sweden was able to overcome their blockade. Dennys Bello, press officer for the Elektrikerna union, noted that Tesla seems to be tapping the services of foreign companies and flying in people to help launch its charging stations. “It is a good question how this has happened. We think it is unfortunate. But they seem to have their methods. They bring in foreign companies and fly in people, we think,” Bello stated.
Network owners Telge Nät has issued an apology to the unions, stating that they regret the launch of the new Superchargers. In a comment, Erik Elowsson, press officer at the Telge Group, highlighted that they are not in any way overriding the union’s efforts.
“We can confirm that two Tesla-owned facilities in Södertälje have been connected contrary to the purpose of the current conflict measures. We regret this. We want to make it clear that we had no intention of overriding Seko’s conflict measures. We have taken strong measures to ensure that this does not happen again. We respect the Swedish model, and stand up for the value of collective agreements and see strength in the dialogue we have with Seko,” Elowsson stated.
Seko, for their part, demanded an apology and correction from Telge Nät. As per Seko’s head of information Jonas Pettersson, “The company has responded that it is a mistake, and we have had a good dialogue with them. They have said that this will never be repeated. Of course, it is unfortunate that it has happened. We feel confident that Telge is now taking the necessary measures to ensure that it never happens again.”
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