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SpaceX Starship prototype days away from first Raptor static fire test

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SpaceX’s latest Starship appears to be just a few days away from becoming the first full-scale prototype to attempt a static fire test with a functional Raptor engine, potentially setting the rocket up for a hop test in the near future.

On April 26th, SpaceX teams successfully filled the fourth full-scale Starship prototype with ~1000 metric tons (~2.2 million lb) of liquid nitrogen, pressurized it to roughly 5 bar (70 psi), and exerted hundreds of tons of force on its “thrust puck” engine section with hydraulic rams. Every part of the test appears to have been completed without issue, making Starship SN4 the first to pass cryogenic proof testing and graduate to riskier tests.

Since then, SpaceX technicians and engineers have been carefully inspecting Starship and likely cleaning its cavernous propellant tanks, while also preparing a lone Raptor engine for installation. By all appearances, that engine installation milestone could occur anytime within the next 24 hours and based on public road closure schedules, the first static fire attempt could occur just a day (or less) later.

SpaceX’s latest Starship prototype could be just a few days away from its first Raptor static fire test. (LabPadre)

Capable of producing at least 200 metric tons (~450,000 lbf) of thrust, SpaceX CEO Elon Musk recently revealed that Starship SN4 will only have one Raptor engine installed. Instead, the first multi-engine static fire and flight tests are planned for its successor, Starship SN5, with SN4 apparently set to feature an asymmetric engine layout.

Starship SN4’s thrust structure and engine section are pictured here on April 12th, confirming that it’s nominally designed to host three engines. (NASASpaceflight – bocachicagal)

Designed for three engines in a triangle formation, Starship’s existing engine section and thrust structure (thrust puck) would need an inefficient one-off redesign or heavy modifications to allow a single Raptor engine to be installed directly in the center of the rocket. Unsurprisingly, SpaceX chose not to waste resources on a one-off addition to a serial prototype. Instead, if Starship survives static fire testing and the asymmetric stress that will create, the rocket may apparently attempt to launch and land with the same setup.

This would very likely result in Starship SN4 both lifting off and landing at an angle, effectively drifting its way off the launch mount and onto an adjacent landing pad.

Raptor performs a static fire test in McGregor, Texas. (SpaceX)
Starship SN4 could soon attempt to replicate Starhopper’s spectacular 150m hop. (SpaceX)

Before that potentially bizarre flight test and the static fire that must precede it, however, SN4 must also complete the first full-scale Starship wet dress rehearsal (WDR), referring to the process of fully fueling a rocket and performing a launch countdown without actually launching. It’s likely that SpaceX plans to roll Starship SN4’s WDR directly into a static fire test, meaning that the massive rocket could ignite a Raptor engine as early as Friday, May 1st.

Stay tuned for visual confirmation of Raptor engine installation on Starship SN4!

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 receives approval for FSD Supervised tests in Sweden

Tesla confirmed that it has been granted permission to test FSD Supervised vehicles across Sweden in a press release.

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Credit: Grok Imagine

Tesla has received regulatory approval to begin tests of its Full Self-Driving Supervised system on public roads in Sweden, a notable step in the company’s efforts to secure FSD approval for the wider European market. 

FSD Supervised testing in Sweden

Tesla confirmed that it has been granted permission to test FSD Supervised vehicles across Sweden following cooperation with national authorities and local municipalities. The approval covers the Swedish Transport Administration’s entire road network, as well as urban and highways in the Municipality of Nacka.

Tesla shared some insights into its recent FSD approvals in a press release. “The approval shows that cooperation between authorities, municipalities and businesses enables technological leaps and Nacka Municipality is the first to become part of the transport system of the future. The fact that the driving of the future is also being tested on Swedish roads is an important step in the development towards autonomy in real everyday traffic,” the company noted. 

With approval secured for FSD tests, Tesla can now evaluate the system’s performance in diverse environments, including dense urban areas and high-speed roadways across Sweden, as noted in a report from Allt Om Elbil. Tesla highlighted that the continued development of advanced driver assistance systems is expected to pave the way for improved traffic safety, increased accessibility, and lower emissions, particularly in populated city centers.

Tesla FSD Supervised Europe rollout

FSD Supervised is already available to drivers in several global markets, including Australia, Canada, China, Mexico, New Zealand, and the United States. The system is capable of handling city and highway driving tasks such as steering, acceleration, braking, and lane changes, though it still requires drivers to supervise the vehicle’s operations.

Tesla has stated that FSD Supervised has accumulated extensive driving data from its existing markets. In Europe, however, deployment remains subject to regulatory approval, with Tesla currently awaiting clearance from relevant authorities.

The company reiterated that it expects to start rolling out FSD Supervised to European customers in early 2026, pending approvals. It would then be unsurprising if the company secures approvals for FSD tests in other European territories in the coming months. 

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Tesla owners in Sweden get direct attention from pro-union groups

As part of their efforts, the group has started distributing informational leaflets to Tesla vehicles across Stockholm, urging them to pressure the electric vehicle maker to sign a collective agreement.

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Andrzej Otrębski, CC BY-SA 4.0 , via Wikimedia Commons

Amid Tesla Sweden’s ongoing conflict with trade union IF Metall, a group of pro-union supporters has begun directing their attention to actual Tesla owners.

As part of their efforts, the group has started distributing informational leaflets to Tesla vehicles across Stockholm, urging them to pressure the electric vehicle maker to sign a collective agreement.

Leaflets on parked Tesla vehicles

As noted in a Dagens Arbete (DA) report, participants of the protest place yellow information slips on parked Tesla vehicles across parts of Stockholm. The slips resemble parking notices that contain information related to the unions’ ongoing strike against Tesla Sweden.

Participants involved in the activity said the leaflets were intended to inform consumers rather than target individual owners. The action was carried out in public areas, with leaflets placed on windshields of parked vehicles. When vehicle owners are present, organizers said they provide verbal explanations of the labor dispute.

Tesla has not commented publicly about the matter as of writing.

Recurring demonstrations against Tesla

The leaflet distribution effort follows weekly demonstrations that have taken place outside Tesla’s workshop and office in Upplands Väsby, where protesters typically gather to express support for a collective agreement. Those demonstrations have included informational outreach to customers and workers and, at times, police presence, according to prior reporting.

In a comment, one of the protesters stated that even Tesla owners must be concerned about the unions’ conflict with the electric vehicle maker. “You may think it doesn’t concern you, as you only drive a car. But it does, as we all have a responsibility for the rules in Sweden. 

“We are not looking to hunt down individual Tesla owners. Rather, this is a way to spread opinion and increase pressure on Tesla. It should have some impact if several Tesla owners come in and say that you should sign a collective agreement,” one of the protesters stated. 

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Tesla lands massive deal to expand charging for heavy-duty electric trucks

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Credit: Tesla Semi/X

Tesla has landed a massive deal to expand its charging infrastructure for heavy-duty electric trucks — and not just theirs, but all manufacturers.

Tesla entered an agreement with Pilot Travel Centers, the largest operator of travel centers in the United States. Tesla’s Semi Chargers, which are used to charge Class 8 electric trucks, will be responsible for providing energy to various vehicles from a variety of manufacturers.

The first sites are expected to open later this Summer, and will be built at select locations along I-5 and I-10, major routes for commercial vehicles and significant logistics companies. The chargers will be available in California, Georgia, Nevada, New Mexico, and Texas.

Each station will have between four and eight chargers, delivering up to 1.2 megawatts of power at each stall.

The project is the latest in Tesla’s plans to expand Semi Charging availability. The effort is being put forth to create more opportunities for the development of sustainable logistics.

Senior Vice President of Alternative Fuels at Pilot, Shannon Sturgil, said:

“Helping to shape the future of energy is a strategic pillar in meeting the needs of our guests and the North American transportation industry. Heavy-duty charging is yet another extension of our exploration into alternative fuel offerings, and we’re happy to partner with a leader in the space that provides turnkey solutions and deploys them quickly.”

Tesla currently has 46 public Semi Charger sites in progress or planned across the United States, mostly positioned along major trucking routes and industrial areas. Perhaps the biggest bottleneck with owning an EV early on was charging availability, and that is no different with electric Class 8 trucks. They simply need an area to charge.

Tesla is spearheading the effort to expand Semicharging availability, and the latest partnership with Pilot shows the company has allies in the program.

The company plans to build 50,000 units of the Tesla Semi in the coming years, and with early adopters like PepsiCo, DHL, and others already contributing millions of miles of data, fleets are going to need reliable public charging.

Tesla is partnering with other companies for the development of the Semi program, most notably, a conglomeration with Uber was announced last year.

Tesla lands new partnership with Uber as Semi takes center stage

The ride-sharing platform plans to launch the Dedicated EV Fleet Accelerator Program, which it calls a “first-of-its-kind buyer’s program designed to make electric freight more affordable and accessible by addressing key adoption barriers.”

The Semi is one of several projects that will take Tesla into a completely different realm. Along with Optimus and its growing Energy division, the Semi will expand Tesla to new heights, and its prioritization of charging infrastructure.

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