News

NASA’s SLS Moon rocket almost aces vital prelaunch test on 7th try

Published

3 years ago

September 22, 2022

Eric Ralph

Following several incomplete attempts in April, June, August, and September, NASA’s first Space Launch System (SLS) Moon rocket has almost aced a vital prelaunch test on the seventh try.

NASA says that “all objectives were met” during the ten-hour test, which wrapped up around 4:30 pm EDT (20:30 UTC) on Wednesday, September 21st. Despite the rocket running into multiple additional issues, some old and others new, the agency was confident enough in the preliminary results of the wet dress rehearsal (WDR) – deemed a “cryogenic demonstration test” – to reaffirm that it’s still working towards a third launch attempt as early as September 27th.

NASA will hold a briefing on the Artemis I mission tomorrow at 12:30 p.m. after fully fueling the rocket and testing a fix to the hydrogen leak. "Based on data from the test, teams are fine-tuning procedures for the next launch opportunity, targeted for no earlier than 9/27."— Christian Davenport (@wapodavenport) September 22, 2022

That launch date is not set in stone, but NASA also hasn’t ruled out the window after the latest round of SLS testing. The agency will host a press conference on Friday, September 23rd, to provide its final decision and offer more details about the seventh wet dress rehearsal.

Despite NASA’s apparent confidence after the test, which was admittedly smoother than most previous SLS tests at the launch pad, it was far from smooth. The immediate story of the “cryogenic demonstration test” dates back to the SLS Artemis I rocket’s second so-called “launch attempt” on September 3rd. During that attempt, the launch was aborted well before SLS was ready when NASA detected a major hydrogen fuel leak around one of the quick-disconnect umbilical panels that fuels and drains the rocket. Remote troubleshooting was unable to solve the problem, forcing NASA to stand down.

Over the last few weeks, teams inspected, tested, and repaired the faulty Tail Service Mast Umbilical (TSMU), preparing for a cryogenic proof test meant to verify that the issue was fixed. During that September 21st test, the TSMU still leaked significantly for the whole duration, but it did so more predictably and – unlike prior leaks – never violated the limits that would trigger a launch abort.

The engine bleed quick disconnect LH2 leak reached 5% during max pressure, but the rate lowered on its own as flow continued. However, anything above 4% would trigger a launch abort if this was launch day. Something for them to evaluate ahead of the next attempt.— Michael Baylor (@MichaelBaylor_) September 21, 2022

But near the end, a different umbilical panel developed a significant hydrogen leak that did violate those launch constraints, meaning that NASA would have likely had to stand down yet again if it had attempted to launch before completing additional testing. The test was completed successfully, but its goals and constraints were not the same as those facing a launch.

A NASA-developed rocket leaking hydrogen is unfortunately a tale as old as time. That the agency that struggled with hydrogen leaks throughout the 30-year career of the Space Shuttle appears to be just as flabbergasted by nearly identical problems on a new rocket – SLS – that has Shuttle ‘heritage’ on almost every square inch is not surprising, even if it is somewhat embarassing.

Liquid hydrogen fuel always has been and likely always will be a massive pain to manage in any rocket, but especially in a large rocket. As the smallest element in the universe, it is fundamentally leak-prone. Combined with the fact that it only remains liquid below the extraordinarily low temperature of -253°C (-423°F), generates ultra-flammable hydrogen gas as it continually attempts to warm to a more stable temperature, and naturally embrittles most metals, it’s an engineering nightmare by almost every measure.

For all that pain, hydrogen does provide rocket engineers exceptional efficiency when properly exploited, but even that positive aspect is often diminished by hydrogen’s ultra-low density. For rocket stages that have already reached orbit, hydrogen-oxygen propellant offers unbeatable efficiency. But for a rocket stage that will never be used in orbit, like the SLS core stage, hydrogen fuel is rarely worth the tradeoffs – a reality that SLS is unfortunately providing a strong reminder of.

Demonstrating the Groundhog Day-esque nature of NASA rockets and hydrogen leaks, the same leaky TSMU panel that aborted SLS’ September 3rd launch attempt (sixth WDR) and had to be fixed and retested on September 21st also caused a hydrogen leak that partially aborted the rocket’s third wet dress rehearsal attempt in April 2022. NASA then rolled the rocket back to the Vehicle Assembly Building (VAB), where workers spent almost two months inspecting and reworking the fuel TSMU and fixing other issues. During its first test (WDR #4) after rolling back to the pad in June, the same fuel TSMU leaked and NASA had to return the rocket to the VAB again to fix the problem.

The fuel TSMU then leaked on the SLS rocket’s first launch attempt (really WDR #5), but the problem was resolved and was not what caused NASA to stand down. It was, however, a primary reason behind NASA’s second aborted launch attempt (WDR #6). With any luck, the eighth time will be the charm.

Investor's Corner

Tesla gets $475 price target from Benchmark amid initial Robotaxi rollout

Tesla’s limited rollout of its Robotaxi service in Austin is already catching the eye of Wall Street.

Published

3 hours ago

June 27, 2025

Simon Alvarez

Credit: Tesla

Venture capital firm Benchmark recently reiterated its “Buy” rating and raised its price target on Tesla stock (NASDAQ: TSLA) from $350 to $475 per share, citing the company’s initial Robotaxi service deployment as a sign of future growth potential.

Benchmark analyst Mickey Legg praised the Robotaxi service pilot’s “controlled and safety-first approach,” adding that it could help Tesla earn the trust of regulators and the general public.

Confidence in camera-based autonomy

Legg reiterated Benchmark’s belief in Tesla’s vision-only approach to autonomous driving. “We are a believer in Tesla’s camera-focused approach that is not only cost effective but also scalable,” he noted.

The analyst contrasted Tesla’s simple setup with the more expensive hardware stacks used by competitors like Waymo, which use various sophisticated sensors that hike up costs, as noted in an Investing.com report. Compared to Tesla’s Model Y Robotaxis, Waymo’s self-driving cars are significantly more expensive.

He also pointed to upcoming Texas regulations set to take effect in September, suggesting they could help create a regulatory framework favorable to autonomous services in other cities.

“New regulations for autonomous vehicles are set to go into place on Sept. 1 in TX that we believe will further help win trust and pave the way for expansion to additional cities,” the analyst wrote.

🚨 Brokerage firm Benchmark has hiked its price target on $TSLA to $475 from $350 following the successful launch of its robotaxi service in Austin

Analyst Mickey Legg said the limited launch "demonstrates a controlled and safety-first approach" that could help Tesla gain… pic.twitter.com/XcyTiBZVPi— Herbert Ong (@herbertong) June 26, 2025

Tesla as a robotics powerhouse

Beyond robotaxis, Legg sees Tesla evolving beyond its roots as an electric vehicle maker. He noted that Tesla’s humanoid robot, Optimus, could be a long-term growth driver alongside new vehicle programs and other future initiatives.

“In our view, the company is undergoing an evolution from a trailblazing vehicle OEM to a high-tech automation and robotics company with unmatched domestic manufacturing scale,” he wrote.

Benchmark noted that Tesla stock had rebounded over 50% from its April lows, driven in part by easing tariff concerns and growing momentum around autonomy. With its initial Robotaxi rollout now underway, the firm has returned to its previous $475 per share target and reaffirmed TSLA as a Benchmark Top Pick for 2025.

News

Tesla is testing a new way to eliminate a rare but concerning Supercharger issue

Tesla is testing a new way to end a rare issue at Superchargers, and its internal pilot program has already started.

Published

19 hours ago

June 26, 2025

Joey Klender

Credit: Tesla

Tesla is now testing a new way to eliminate a rare but concerning issue that can arise at Superchargers, especially as the company’s vehicles become more popular.

Tesla’s Supercharger Network is the most robust in the world, but the company has opened it up to other manufacturers, which makes the network even more congested than it already is.

Superchargers are continually being built, and existing stations are undergoing expansion in congested areas. However, there is one rare issue that still arises from time to time, and that’s the case of drivers cutting in line to charge before another vehicle that arrived before they did.

Tesla is rolling out a new ‘Supercharger queue’ in an effort to end one issue

A few months ago, Tesla said it would start testing a “virtual queuing” system that would tell cars what their position is in line. This would eliminate any instances of confusion between drivers and would also keep cutters from butting in front of those who arrived before them.

Now, Tesla is officially testing the program, according to Max de Zegher, the company’s North American charging head:

Pressure testing virtual queuing with the awesome @TeslaCharging teams, including for corner cases & bad actors. Public pilots next. If we get this right, it will be a big improvement for those rare cases with a wait. https://t.co/mxpFarYgJi pic.twitter.com/IgVVH2wiOe

— Max (@MdeZegher) June 26, 2025

Public pilots will begin soon at select sites after Tesla completes its internal testing. Admittedly, this is an incredibly rare issue, but it is something that is worth confronting because it will eliminate confrontations at Superchargers.

Elon Musk

Tesla still has two major milestones on track before end of Q2

Tesla still is on track to complete two monumental achievements as Q2 nears its end.

Published

22 hours ago

June 26, 2025

Joey Klender

(Credit: Tesla)

Tesla still has two major milestones it is on track to complete before the end of the second quarter, according to statements made by the automaker earlier this year.

With the launch of the Robotaxi platform in Austin on Sunday, Tesla has already completed perhaps its biggest milestone of 2025.

However, these are not the only things the company hopes to accomplish before we head into the latter half of the year, as there are two major things the company said it is aiming to complete before the third quarter starts next week.

Affordable Models

Tesla said earlier this year, on two separate occasions, that it is still on track to develop, build, and unveil the first affordable models that will be built on both the next-gen platform and also have aspects of the current vehicle platform.

Potential affordable Tesla “Model 2/Model Q” test car spotted anew in Giga Texas

In the Q4 2024 Earnings Call in January, the company said:

“Preparations are underway across our existing factories for the launch of new products in 2025, including more affordable models.”

The company continued:

“Plans for new vehicles, including more affordable models, remain on track for start of production in the first half of 2025. These vehicles will utilize aspects of the next generation platform as well as aspects of our current platforms and will be produced on the same manufacturing lines as our current vehicle line-up.”

Although there are only a few days left, Tesla has yet to confirm that these affordable models are delayed, so we can expect that they’ll be arriving before the quarter ends.

The company might have been hinting toward one recently at the Fremont Factory, but it is more likely that the vehicle seen was the new Model Y Performance trim:

Tesla’s apparent affordable model zips around Fremont test track

Tesla delivers itself to customers

Back in late May, CEO Elon Musk said that the first Tesla to self-deliver would happen in June:

For the past several days, Tesla has been testing self-driving Model Y cars (no one in driver’s seat) on Austin public streets with no incidents.

A month ahead of schedule.

Next month, first self-delivery from factory to customer.

— Elon Musk (@elonmusk) May 29, 2025

Tesla just launched its Robotaxi platform on Sunday, so this would be a tremendous step if it can, in fact, make this happen.

The customer would likely be extremely local to Gigafactory Texas. In the future, the company would load the vehicles onto haulers and then drive to customer homes from delivery centers, showrooms, and repair centers.