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SpaceX's new Starship test stand to make life a little easier for Raptor engine engineers

According to SpaceX CEO Elon Musk, one seemingly small tweak to Starship engine testing could make life much easier for Raptor engineers. (SpaceX)

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5 years ago

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SpaceX recently debuted a new rocket engine test stand at its Central Texas development facilities and one specific aspect of the so-called ‘tripod stand’ could make life a lot easier for Starship’s Raptor engine engineers.

The success of SpaceX’s extremely ambitious Starship spacecraft and Super Heavy boosters hinges heavily on the prior success of a next-generation rocket engine the company is developing itself. Known as Raptor, the engine is likely one of the most complex ever developed, owing to its use of a combustion cycle that’s as challenging and unforgiving as it is efficient. That efficiency is the draw.

The decision to base the Starship launch system around methane and oxygen propellant – relatively dense, safe to handle, and easy to generate on Mars – means that it can never be as efficient as a rocket based on hydrogen and oxygen, the pinnacle of chemical combustion-based propulsion. For a methalox rocket as nominally reusable as Starship, going to extremes to eke even a smidge of extra efficiency out of its Raptor engines is a reasonable – if not necessary – decision. However, that pursuit of efficiency carries many hurdles with it, some of which can even be exacerbated by the equipment used to test those engines on the ground.

SpaceX mocked up Starship Mk1 with three Raptor engines in late-September, but all three departed Boca Chica shortly after Musk’s presentation. (SpaceX)

Raptor is less than unique in this particular case but SpaceX’s engine development and testing has matured to the point that the stands it’s relied on for static fires have become a detriment to the engine’s progress. Specifically, aside from Starhopper, all previous Raptor static fires have been performed with engines installed horizontally in test bays located at SpaceX’s McGregor, Texas development facilities. While in flight, Raptor engines will theoretically never experience wear and tear similar to the unique conditions imposed by horizontal testing – engine burns will almost invariably exert forces along a vertical (up and down) axis.

To almost anyone else, even other engine development companies, this might seem like an insignificant difference. Built around the full-flow staged combustion (FFSC) cycle and meant to be unprecedentedly reusable and reliable, the Raptor engine is not quite as forgiving. Since the engine’s inaugural full-scale static fire test just one year ago, SpaceX CEO Elon Musk has noted several times that Raptor could benefit from new vertical test stands.

Speaking in October 2019, Musk stated that a new vertical test stand would “hopefully allow simplification of Raptor design, as pump shaft wear & drainage is better in vertical config.” More generally, testing Raptor engines vertically would also be “more representative of flight [conditions]”, allowing SpaceX to live up to its proven “test as you fly” philosophy.

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Pictured here in April 2018, SpaceX’s McGregor, Texas ‘tripod stand’ is visible to the right of the more functional flat-ground stand that replaced it. Also present is the first Falcon 9 Block 5 booster, B1046. (Aero Photo)

Indeed, aside from Starhopper’s two successful test flights and a handful of static fires, Raptor has performed barely any vertical testing despite more than 3200 seconds of static fires completed with 18 full-scale engine prototypes in the last 12 months alone. Including subscale engines tested from 2016 through 2018, SpaceX’s Raptor engine has likely completed some 5000 seconds (>80 minutes) of test fires over the course of three and a half years of development.

Aside from allowing SpaceX engineers to potentially simplify the Raptor engine design and test the Starship engines in conditions much closer to what they will experience in flight, the addition of a new dedicated test stand – on top of two existing horizontal bays – should allow even more testing to be done in a given time-frame. The more testing that can be done, the more engines SpaceX can quickly qualify for flight, and given that every Starship/Super Heavy pair could require up to 43 new Raptor engines, SpaceX will need all the testing capacity it can get.

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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 reveals Tesla’s next Robotaxi expansion in more ways than one

Tesla Robotaxi is growing in more ways than one. Tesla wants to expand and hopes to reach half the U.S. population by the end of the year.

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1 hour ago

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July 24, 2025

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Credit: Tesla

Tesla CEO Elon Musk revealed the company’s plans for its next expansion of the Robotaxi in terms of both the geofence in Austin and the platform overall, as it looks to move to new areas outside of Texas.

Tesla launched the Robotaxi platform last month on June 22, and has since expanded both the pool of users and the area that the driverless Model Y vehicles can travel within.

The first expansion of the geofence caught the attention of nearly everyone and became a huge headline as Tesla picked a very interesting shape for the new geofence, resembling male reproductive parts.

The next expansion will likely absolve this shape. Musk revealed last night that the new geofence will be “well in excess of what competitors are doing,” and it could happen “hopefully in a week or two.”

Musk’s full quote regarding the expansion of the geofence and the timing was:

“As some may have noted, we have already expanded our service area in Austin. It’s bigger and longer, and it’s going to get even bigger and longer. We are expecting to greatly increase the service area to well in excess of what competitors are doing, hopefully in a week or two.”

The expansion will not stop there, either. As Tesla has operated the Robotaxi platform in Austin for the past month, it has been working with regulators in other areas, like California, Arizona, Nevada, and Florida, to get the driverless ride-hailing system activated in more U.S. states.

Tesla confirmed that they are in talks with each of these states regarding the potential expansion of Robotaxi.

Musk added:

“As we get the approvals and prove out safety, we will be launching the autonomous ride-hailing across most of the country. I think we will probably have autonomous ride-hailing in probably half the population of the US by the end of the year.”

We know that Tesla and Musk have been prone to aggressive and sometimes outlandish timelines regarding self-driving technology specifically. Regulatory approvals could happen by the end of the year in several areas, and working on these large metros is the best way to reach half of the U.S. population.

Tesla said its expansion of the geofence in Austin is conservative and controlled due to its obsession with safety, even admitting at one point during the Earnings Call that they are being “paranoid.” Expanding the geofence is necessary, but Tesla realizes any significant mistake by Robotaxi could take it back to square one.

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Tesla warns customers of incentive strategy on EVs as tax credit nears end

If you’re thinking of buying a Tesla, the time to order is now, the company claimed.

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3 hours ago

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July 24, 2025

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(Credit: Tesla)

Tesla has warned customers about its incentive strategy for qualifying electric vehicles, as the days of both the $7,500 EV tax credit for new EVs and the $4,000 credit for used EVs are coming to a close.

Both tax credits, which impact some of the vehicles in the Tesla lineup, are set to be eliminated at the end of Q3. The phase out of these consumer credits was always in the plans of the Trump Administration, but now we’re in the final quarter of their existence.

As a result, EV companies are scrambling to see how they can reduce costs or make their vehicles more affordable for customers. The $7,500 will price many consumers out of many EVs on the market, and Tesla is not immune to that.

However, Tesla has made a significant push into Q3 deliveries, rolling out numerous incentives to customers, including 0% APR on select purchases, lease deals, free upgrades on certain inventory units, and more.

The extensive list of incentives on Tesla vehicles in the quarter will not get any longer, either. During last night’s Tesla Earnings Call for the second quarter of 2025, company executives stated that their intention for these incentives was to encourage customers to place orders early in the quarter.

Tesla will only be able to apply the $7,500 credit with deliveries that occur before the end of September. Even if an order is placed before then, delivery must be completed by September 31 to receive the tax credit.

CFO Vaibhav Taneja confirmed that the incentives for the quarter are already out and encouraged customers to place an order sooner rather than later:

“Given the abrupt change, we have a limited supply of vehicles in the US this quarter. As we are already within lead times to order parts for cars, we have rolled out all our planned incentives already and will start pairing them back as we start to sell. If you are in the US and looking to buy a car, let’s roll now as we may not be able to guarantee delivery for orders placed in the later part of August and beyond.”

The loss of the incentives will impact every EV maker in the United States. Tesla has a plan moving forward, and it said last night that its affordable models would be rolled out in Q4, as introducing these cars any earlier could have detrimental effects on Model 3 and Model Y sales.

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Tesla Model Y awarded Top Safety Pick+ from IIHS

The new Model Y continues to impress with this new award.

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5 hours ago

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July 24, 2025

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(Credit: Tesla)

The 2025 Tesla Model Y was one of two midsize luxury SUVs to receive the Top Safety Pick+ award from the Insurance Institute for Highway Safety (IIHS).

To qualify for the IIHS’s Top Safety Pick+ or even the lower-tier Top Safety Pick label, vehicles need good ratings in the small overlap front and side crash tests, an acceptable or good rating in the pedestrian front crash prevention evaluation, and acceptable or good ratings for headlights across all trim levels.

The difference between the two labels is that an “Acceptable” rating in the moderate overlap front test will get a car the Top Safety Pick rating, but a “Good” rating in this category will win the elusive Top Safety Pick+ category.

The 2025 Model Y, codenamed “Juniper” internally by Tesla, was released in the United States earlier this year and received the top rating across each of the categories, automatically qualifying it for the Top Safety Pick+ label:

Other vehicles in Tesla’s lineup have extraordinary marks in crash testing according to other agencies, like the National Highway Traffic Safety Administration (NHTSA), but there are reasons those cars are not on the IIHS lists.

In 2024, we reported that the IIHS had evaluated some Tesla vehicles for the necessary tests to achieve these marks. Joe Young of the agency told us that the Model 3, for example, was not featured on either the Top Safety Pick or Top Safety Pick+ lists because the vehicle had several missing tests.

Here’s why the Tesla Model 3 wasn’t an IIHS Top Safety Pick+, and why it could be soon

This is not to say those other Tesla vehicles would not perform well. The Cybertruck performed better than any pickup has ever in NHTSA crash testing assessments.

The Model Y is Tesla’s most popular vehicle and was the best-selling car in the world over the past two years. Tesla’s intense focus on safety continues to show that this priority goes into every decision the company makes regarding design and engineering. This focus has continued to pay dividends as some real-world crashes save the lives of those inside the cars.

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