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SpaceX’s first orbital Starship engine just breathed fire

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Less than three weeks after shipping to Texas, SpaceX says that Starship’s first Raptor Vacuum engine has completed a “full duration test fire” on the march towards orbital test flights.

Known as Raptor Vacuum or RVac, the engine is almost entirely based off of its sea level-optimized cousin, taking all of the complex turbomachinery and combustion chambers that represent the bulk of a rocket engine. Things start to diverge below the throat of the combustion chamber (the narrow part of the central hourglass-like curve), where SpaceX has expanded Raptor’s existing bell nozzle by a factor of five or more.

SpaceX’s reusable Starship spacecraft will use a mix of three sea level Raptors and three Raptor Vacuum engines to give it the thrust it needs to reach orbit and ensure efficient operations both in atmosphere and vacuum.

Raptor Vacuum (roughly) to scale alongside Raptor Sea Level, a Space Shuttle Main Engine (SSME), and a Saturn V F-1. (Teslarati)

In simple terms, a rocket engine can benefit from a vacuum-optimized nozzle because the added surface area (more or less) gives the extremely high-pressure gases exiting its combustion chamber even more footholds to push against. Rocket nozzles are at their most efficient when the engine’s exhaust gas finishes expanding to match ambient pressure at the exact moment it exits the bell. Logically, at sea level on Earth, the ambient air pressure is quite high, meaning that rocket exhaust doesn’t have to expand as much to equalize.

In the vacuum of space, however, exhaust gases must expand far more to reach the same pressure as its surroundings. For rocket propulsion, that extra expansion can be exploited to make a more efficient engine, squeezing extra energy out of the same propellant and in a perfect vacuum, the most efficient nozzle would technically be infinite. Engineering and physical infinities don’t exactly get along, unfortunately, so vacuum rocket engineers are forced to settle on a nozzle size at a scale that humans can feasibly manufacture.

In theory, Starship doesn’t need Raptor Vacuum engines to be a functioning orbital spacecraft and CEO Elon Musk himself floated a design with seven sea-level engines just two years ago. Since then, the SpaceX CEO revealed that Raptor was making such good progress that the company undid the removal of vacuum-optimized engines from Starship’s baseline design.

Look, Ma, no vacuum engines! (SpaceX)

It’s unclear exactly what SpaceX means when it says that Raptor Vacuum SN1 completed a “full duration test fire.” For Starship, a full-duration orbital insertion burn – beginning immediately after Super Heavy booster separate – would likely be no shorter than five or six minutes. Even for SpaceX, going from shipping the very first engine (Raptor Vacuum) produced to a successful several-minute static fire in less than three weeks’ time would be an almost inconceivable feat of engineering. The feat would imply that SpaceX is already extremely comfortable with several-minute Raptor burns – perhaps the single biggest hurdle standing between Starship and orbit.

More likely, “full duration test fire” simply refers to the fact that the pathfinder Raptor Vacuum engine managed to ignite, burn, and shut down on schedule – avoiding a premature shutdown, in other words. For an engine as large and complex as Raptor, even that downgraded interpretation would represent an impressive achievement.

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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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Elon Musk’s Neuralink posts massive update with new milestone

This is the first time Neuralink has successfully implanted two patients in a single day.

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neuralink link device with white background
(Credit: Neuralink)

Elon Musk’s Neuralink has posted a massive update with a new milestone that puts the company’s progress into perspective. Over the past few years, we have seen tremendous strides in Neuralink’s capabilities.

Now, the company has completed a new first, bringing more hope to the future of this revolutionary technology.

Neuralink’s third brain chip patient shares first video edited with BCI

Neuralink revealed in an update on Monday morning that it has officially completed two implants in a single day, with Patients 8 and 9 both receiving devices over the past weekend.

“Both participants are recovering well and in great spirits,” the company said in the short update. It did not disclose which day the surgeries were completed, but it did state explicitly that they both occurred on the same day:

Musk said that Neuralink’s capabilities could do “life-changing good for ultimately millions, maybe billions, of people.” Right now, it is being used to help combat life-altering diseases, such as ALS, also known as Lou Gehrig’s Disease, as well as cervical spinal cord injuries.

Eventually, Neuralink could resolve things like anxiety, depression, and blindness, among many other ailments.

Its Link device also received FDA recognition for speech restoration earlier this year, marking a significant bit of progress in the program as it explores ways to cure ailments of various natures.

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Elon Musk

Elon Musk gives key update on plans for Tesla Diner outside of LA

More Tesla Supercharger Diners are on the way, Elon Musk says, as long as the initial one is successful.

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tesla diner supercharger in los angeles california at night
Credit: Tesla

Elon Musk has given a key update on its plans for the Tesla Supercharger Diner, as the first location in Los Angeles is set to open today, July 21.

The idea for the Supercharger Diner, which resembles a 50s-style eatery with elements of futuristic technology, is seven years in the making. Many wondered whether Tesla would expand its idea for a Supercharger restaurant outside of LA, and now we have an answer directly from Musk.

Elon Musk confirms awesome new features at Tesla Diner Supercharger

The Tesla CEO said that the company will establish these types of experiences “in major cities around the world, as well as at Supercharger sites on long distance routes.”

The Supercharger Diner has plenty of ways to draw in customers, and although the food and merchandise sold at the location will not be a major contributor to Tesla’s balance sheet, where investors want to see it, it could pay off in other ways.

The Diner is not exclusive to Tesla owners, so those who drive gas cars can still stop in for a burger, fries, and a shake while roaming around Los Angeles. The features of the Diner, however, do require a Tesla vehicle.

In-car ordering and movie screens syncing to the center touchscreen are two things that Tesla owners will enjoy that other drivers will not. These might be trivial, but the experience on its own could be a way that some consider buying a Tesla.

It might sound crazy that a singular diner experience would flip someone to buy a car, but it’s not the most outlandish thing we’ve ever come across.

The question is where Tesla will plan to build these Supercharger Diners. Musk has already indicated that Starbase, Texas, will be one location, which fits with one of his other companies, SpaceX.

Austin could be an ideal location, but New York, Miami, Washington D.C., Boston, and plenty of other popular metro areas within the U.S. could see their own diners in the coming years.

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Investor's Corner

Tesla analyst says this stock concern is overblown while maintaining $400 PT

Tesla reported $2.763 billion in regulatory credit profits last year.

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Credit: Tesla

One Tesla analyst is saying that a major stock concern that has been discussed as the Trump administration aims to eliminate many financial crutches for EV and sustainable industries is overblown.

As the White House continues to put an emphasis on natural gas, coal, and other fossil fuels, investors are concerned that high-powered sustainability stocks like Tesla stand to take big hits over the coming years.

However, Piper Sandler analyst Alexander Potter believes it is just the opposite, as a new note to investors released on Monday says that the situation, especially regarding regulatory credits, is “not as bad as you think.”

Tesla stacked emissions credits in 2023, while others posted deficits

There have been many things during the Trump administration so far that have led some investors to consider divesting from Tesla altogether. Many people have shied away due to concerns over demand, as the $7,500 new EV tax credit and $4,000 used EV tax credit will bow out at the end of Q3.

The Trump White House could also do away with emissions credits, which aim to give automakers a threshold of emissions to encourage EV production and cleaner powertrains. Companies that cannot meet this threshold can buy credits from other companies, and Tesla has benefitted from this program immensely over the past few years.

As the Trump administration considers eliminating this program, investors are concerned that it could significantly impact Tesla’s balance sheet. Potter believes the issue is overblown:

“We frequently receive questions about Tesla’s regulatory credits, and for good reason: the company received ~$3.5B in ‘free money’ last year, representing roughly 100% of FY24 free cash flow. So it’s fair to ask: will recent regulatory changes threaten Tesla’s earnings outlook? In short, we think the answer is no, at least not in 2025. We think that while it’s true that the U.S. government is committed to rescinding financial support for the EV and battery industries, Tesla will still book around $3B in credits this year, followed by $2.3B in 2026. This latter figure represents a modest reduction vs. our previous expectation…in our view, there’s no need for drastic estimate revisions. Note that it’s difficult to forecast the financial impact of regulatory credits — even Tesla itself struggles with this — but the attached analysis represents an honest effort.”

Tesla’s regulatory credit profitability by year is:

  • 2020: $1.58 billion
  • 2021: $1.465 billion
  • 2022: $1.776 billion
  • 2023: $1.79 billion
  • 2024: $2.763 billion

Potter and Piper Sandler maintained an ‘Overweight’ rating on the stock, and kept their $400 price target.

Tesla shares are trading at $329.63 at 11:39 a.m. on the East Coast.

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