

News
SpaceX’s Starship Raptor Vacuum engine plans laid out by CEO Elon Musk
Elon Musk says that SpaceX Starship engine upgrades are on track to begin static fire tests of a Raptor Vacuum variant as few as a “couple months” from now.
Designed to enable more efficient performance in thin atmosphere or vacuum, Musk admitted that the first version(s) of Raptor Vacuum (RVac) will likely be a compromise between efficiency and speed of development. Nevertheless, the faster SpaceX can prepare Raptor Vacuum for flight, the easier it will be for Starship to begin serious (sub)orbital flight tests.
As it turns out, SpaceX’s first and only official render of Raptor – published in September 2016 – showed the engine’s vacuum-optimized variant. In the years since, CEO Elon Musk has vacillated between keeping the vacuum engines as a central Starship feature and simply replacing them with regular sea level Raptors to expedite the spacecraft’s debut. The 2016 and 2017 vehicles featured a mixture of vacuum and sea-level engines, whereas Musk revealed a vehicle with sea-level engines only in 2018.



Perhaps less than a month after Musk’s September 2018 presentation, the SpaceX CEO made the decision to radically redesign the vehicle – newly christened Starship and Super Heavy – by moving from a carbon composite aerostructure to stainless steel. At first, the seven SL Raptors remained a part of the design, but Musk took to Twitter in 2019 to indicate that SpaceX had changed gears again and had reprioritized Raptor Vacuum development.
This came as a bit of surprise and it should go without saying that there’s a significant chance that Musk/SpaceX will oscillate in the opposite direction once again before Raptor Vacuum is actually ready for flight. This time, though, Musk has sketched out a development schedule and strategy that suggests SpaceX is much more serious this time.
Most notably, Musk claims that the first Raptor Vacuum prototype could be ready for static fire testing just a “couple months” from now, an immensely ambitious schedule for any large liquid rocket engine development program. Nevertheless, Musk did indicate that the “V1.0” Raptor Vacuum design would be significantly compromised and “suboptimal”, an intentional decision to prioritize the engine’s “speed of development”.
Even then, Musk believes that the first variant – featuring a shortened bell nozzle – could still be up to 12% more efficient than sea level Raptors and thus already 70-80% of the way to the physical limit of methane-oxygen rocket efficiency.

On a positive note, shrinking V1.0 Raptor Vacuum’s nozzle a bit from its nominal length will likely mean that SpaceX can static fire fully-integrated engines at its McGregor, TX test facilities, critical for speedy development. If not, the company has experience with alternatives through Merlin Vacuum, which can only be tested on the ground with its lengthy nozzle detached. This method just makes it dramatically harder to optimize a vacuum nozzle design, as full-scale, flight-like testing is nearly impossible if a given vacuum engine can’t be tested on the ground with said nozzle installed.
Vacuum engines need such large and unwieldy nozzles in order to make them as efficient as possible. In a very simplistic sense, a rocket engine nozzle directs the flow of superheated, ultrafast gases in order to squeeze as much momentum transfer as possible out of available propellant. The lower the pressure of the surrounding atmosphere is, the more those gases will expand immediately after leaving the nozzle – giant vacuum nozzles simply try to harness the additional momentum available from that extra expansion. This is why rocket exhausts appear to spread and thin out as launch vehicles reach higher and higher altitudes.

In this sense, the perfect theoretical vacuum nozzle is quite literally infinitely long. The job of vacuum rocket engineers is to find the perfect balance between that impractical theoretical perfection and the limits of real-world materials and dynamics. In theory, SpaceX’s sea-level Raptor engines have already been designed to operate in vacuum conditions, while the engine’s closed-cycle design and regeneratively (i.e. propellant) cooled nozzle should apply well to a vacuum design.
If SpaceX is lucky, there will be few roadblocks in the way of simply lengthening a SL Raptor-style nozzle and calling it a day, in which case it would be impressive but not all that surprising if SpaceX is actually able to begin RVac testing before the end of 2019. Once a rough V1.0 engine is in place, the process of optimizing efficiency can be done slowly and methodically, all while exploiting an unprecedented wealth of data from flight and orbit-tested Raptor Vacuum engines.
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Elon Musk
SpaceX Starship gets FAA nod for ninth test flight
The FAA has given the green light for Starship’s ninth test flight.

SpaceX has received FAA approval for the ninth test flight of the Starship rocket. The approval was delayed due to the federal agency finishing its comprehensive safety review of the eighth flight earlier this year.
The FAA said in a statement that it has determined that SpaceX has “satisfactorily addressed the causes of the mishap, and therefore, the Starship vehicle can return to flight.”
The eighth test flight occurred back on March 6. SpaceX completed a successful liftoff of Starship and the Super Heavy Booster, before the two entered stage separation a few minutes after launch.
Starship Flight 8: SpaceX nails Super Heavy booster catch but loses upper stage
The booster returned and was caught by the chopsticks on the launch pad, completing the second successful booster catch in the program’s history. However, SpaceX lost contact with Starship in the upper atmosphere.
The ship broke up and reentered the atmosphere over Florida and the Bahamas.
The debris situation caused the FAA to initiate a mishap investigation:
Starship Flight 8’s Ship 34 provided some beautiful fireworks in the sky during its rapid unscheduled disassembly. Beautiful but unfortunate.
Hopefully, Flight 9 would no longer have any RUD incidents. pic.twitter.com/p4qAToDXOM
— TESLARATI (@Teslarati) March 7, 2025
The FAA said it will verify that SpaceX implements all the corrective actions on Flight 9 that it discovered during the mishap investigation.
There is no current confirmed launch window, but the earliest it could take off from Starbase is Tuesday, May 27, at 6:30 p.m. local time.
To prevent any injuries and potentially limit any damage, the FAA has stayed in contact with various countries that could be impacted if another loss of vehicle occurs:
“The FAA is in close contact and collaboration with the United Kingdom, Turks & Caicos Islands, Bahamas, Mexico, and Cuba as the agency continues to monitor SpaceX’s compliance with all public safety and other regulatory requirements.”
The agency has also stated that the Aircraft Hazard Area (AHA) is approximately 1,600 nautical miles and extends eastward from the Starbase, Texas, launch site through the Straits of Florida, including the Bahamas and Turks & Caicos.
For flight 8, the AHA was just 885 nautical miles.
News
Hyundai begins real-world testing of AI-powered EV charging robot

Hyundai announced on Thursday that it has officially launched real-world testing of its AI-powered EV charging robot, which it is referring to as the ACR.
The Korean company is partnering with both Kia and Incheon International Airport for the testing phase, which was launched with a memorandum of understanding (MOU). The pilot program is going to be used to lay the groundwork for future robot use for EV charging.
Incheon already has a reputation that aligns with the pilot program as it has the largest eco-friendly vehicle infrastructure in Korea, according to Korea JoongAng Daily, which first reported the launch of the pilot program.
Hyundai is partnering with Kia’s Robotics Lab to provide hardware and software solutions for this early rollout.
Yan Hee-won, President of Hyundai Motor’s R&D Division, said:
“This marks an important turning point in validating the practical value of future mobility technologies. With customized automatic charging solutions, we aim to deliver a more convenient and enhanced mobility experience for users.”
The testing phase will be limited in the sense that the charging robot will be deployed for a fleet of eco-friendly airport vehicles. Those who park their EVs at the airport will not be able to use it for use while they’re traveling — at least at first.
Eventually, it will become a great way to give vehicles range while the owners are off on trips.
Tesla had a similar idea several years ago, which it shared viral videos of back in 2015.
Tesla “snake charger” wasn’t just a creepy one-off, suggests Elon Musk
Musk said in 2020 that Tesla still had the intention of making it. However, it has shifted to wireless induction charging, which seems to be a better option simply because of fewer moving parts and better compatibility with the upcoming Robotaxi fleet.
Tesla flexes Robotaxi wireless charging — autonomy from top to bottom
Tesla displayed its wireless charging idea at the “We, Robot” event last year:
Robotaxi wireless charging
No hands required pic.twitter.com/XL746DkGhb
— Tesla (@Tesla) October 18, 2024
Elon Musk
How Tesla could benefit from the ‘Big Beautiful Bill’ that axes EV subsidies
Tesla has a few paths to limit damage from the elimination of tax credits.

The United States House of Representatives passed President Trump’s “Big Beautiful Bill” by a vote of 215 to 214 on Thursday, effectively bringing an end to many EV subsidy programs, like the $7,500 tax credit, by the end of this year.
The bill will not only eliminate the $7,500 credit on new EV purchases, but also the $4,000 credit given on the purchase of used electric vehicles, and a $1,000 credit on the installation of Level 2 chargers. It will also impact solar subsidies that help generate clean energy in a residential setting.
EVs would also be subject to a $250 road use fee.
🚨 The “Big Beautiful Bill” has been passed in the House, meaning:
1) The EV tax credit is in serious jeopardy. It will likely be eliminated for 2026.
2) EVs will likely have a $250 road use fee
3) $1,000 Level 2 charger credit will also be eliminated pic.twitter.com/Aad41say43— TESLARATI (@Teslarati) May 22, 2025
All of these things sound like negatives — truly because they are. Those who are not in a financial position to buy an EV this year, even with the tax credit, might not be able to afford them in the coming years either, unless manufacturers are able to bring pricing to a level that is more accessible to consumers.
In theory, President Trump’s focus on bringing manufacturing back to America would bring prices down, but it won’t happen overnight. Companies will take many years to completely bring manufacturing and part sourcing to the United States.
However, Tesla could feel some positives from this bill, and it all comes down to timing. Of course, in the long term, it wouldn’t be great for the company, especially if it did not have two things going on right now: a slightly lagging delivery pace and the introduction of affordable models.
Tax Credit Sunsetting Advantage
Sunsetting the $7,500 tax credit means one thing: those who have been in limbo over buying an EV from Tesla are going to have to make a decision on whether they want to buy this year and still have access to the credit, or test their luck and hope for price reductions.
More than likely, those who have been on the fence will be willing to pull the trigger this year, and Tesla will definitely gain some sales from this fact alone. Other automakers will, too.
This could help offset Tesla’s slow start to the year, which has been caused by the changeover of production lines of the Model Y across each of its factories globally.
Affordable Models
Tesla said earlier this year that it will roll out affordable models in the first half of 2025. These cars are expected to be around the $30,000 mark, but the company has not shed any true information on what they will cost.
Potential affordable Tesla “Model 2/Model Q” test car spotted anew in Giga Texas
Ideally, the cars would cost under $30,000 without the EV tax credit, which would be more than accessible for many car buyers in the United States.
The introduction of models that are not in need of a tax credit to be affordable to the masses. This would help offset some of the losses Tesla might feel from cars losing the tax credit.
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