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SpaceX just finished its third Starship rocket in two months and a fourth is on the way

SpaceX just finished its third full-scale Starship prototype in a handful of months. (NASASpaceflight - bocachicagal)

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5 years ago

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SpaceX just rolled a completed Starship prototype to the launch pad for the third time in two months and began stacking the next rocket just hours after its assembly facilities were vacated.

SpaceX began building the latest Starship prototype – known as serial number 4 (SN4) – around March 23rd. Exactly 31 days later, SpaceX lifted the vast steel rocket onto a Roll Lift transporter and carried it roughly a mile down the road to the company’s Boca Chica, Texas test and launch facilities. In just a few hours, technicians lifted the rocket off its transporter and onto a fixed launch mount made out of thick steel beams, expediency made possible partly by the addition of new mounting points and hold-down clamps.

Sitting atop the late Starship SN3 prototype’s salvaged skirt, landing leg, and service section, the fate of Starship SN4 remains to be seen and the path it has taken to the pad is paved with the remains of several former prototypes. For the most part, that should be a positive aspect. Given how apparent it is that SpaceX is very quickly learning from past mistakes, SN4 has the best chance yet of successfully passing its proof tests and graduating into Raptor static fire and (perhaps) flight testing. However, if things don’t go as planned, SpaceX is perhaps just a week or two away from completing the next prototype – Starship SN5.

Starship SN4 rolled to the launch pad on Thursday, April 23rd, exactly one month after work on the rocket began. (Elon Musk)

A few hours after SpaceX lifted Starship SN4 onto its steel launch mount, CEO Elon Musk revealed an aerial photo of the rocket and its pad facilities taken with a drone. Recently painted gray and refurbished to undo damage done by Starship SN3’s April 3rd, that mount is currently configured with a strong metal frame and three powerful hydraulic rams. A nearly identical jig was damaged during SN3’s last test when a minor tsunamic of liquid nitrogen – used to safely simulate ultra-cold and explosive liquid oxygen and methane propellant – washed over the mount after the rocket burst.

Much like an ice cube can violently crack and pop when it rapidly changes temperature, untreated steel (almost always cheaper than the alternative) can also be catastrophically damaged by rapid temperature changes (thermal shock). This appears to be exactly what happened to the first hydraulic ram mount, which had visible cracks in photos taken after Starship SN3’s April 3rd demise.

Starship SN4 was installed on top of a launch mount and hydraulic ram stand on April 23rd. (NASASpaceflight – bocachicagal)

SpaceX appears to have had no issue at all acquiring a replacement in a matter of weeks and it arrived and was installed several days ago. The purpose of the hardware is relatively simple: simulate the stresses one or three Raptor engines will create when ignited and ensure Starship’s ‘thrust puck’ and engine section can survive those stresses while filled with cryogenic liquid methane.

Each ram attaches to the thrust puck with the same hardware an actual Raptor uses, including the rods each engine needs for thrust vector control (TVC; i.e. active steering). In the event that Starship SN4 passes its cryogenic proof test(s) and engine stress simulation(s) with flying colors, SpaceX has already built, acceptance-tested, and shipped three Raptor engines to Boca Chica, where they are waiting inside an assembly tent for their call to action.

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Once a Starship prototype passes acceptance testing and three Raptor engines can be installed, it will be a first for SpaceX’s next-generation rocket engine. For example, if SN4 makes it through testing and is ready to proceed into static fire operations, it will be the first time Raptor has operated in a multi-engine setup – always a significant milestone for any launch vehicle, including SpaceX’s own Falcon 9 and Merlin engines.

In case SN4 does make it to the other side, SpaceX is already prepared with both road closures and NOTAMs (Notices To Airmen) for static fire and hop tests spread out over the next week or so.

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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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SpaceX calls off Starship 10 flight attempt once again

SpaceX is calling off a potential launch of Starship this evening, marking the second consecutive night the tenth test flight of the massive rocket will be delayed.

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21 minutes ago

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August 25, 2025

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Credit: SpaceX

SpaceX is calling off a potential launch of Starship this evening, marking the second consecutive night the tenth test flight of the massive rocket will be delayed.

Originally planning to launch on Sunday at 6:30 p.m. local time in Starbase, Texas, SpaceX was forced to delay the tenth launch of Starship due to a hardware issue.

“Ground side liquid oxygen leak needs to be fixed. Aiming for another launch attempt tomorrow,” CEO Elon Musk posted on the social media platform X.

Starship Flight 10 rescheduled as SpaceX targets Monday launch

The launch was then pushed to Monday night, and the launch window was set to start at the same time as Sunday. However, SpaceX would push it back to 6:44 p.m. due to some weather issues.

Eventually, Starship seemed like it was trending toward a launch, but weather continued to persist in the area, with thunder, rain, and lightning all threatening in the area.

At around 7:03 p.m., SpaceX decided to stand down once again, confirming weather was the culprit of yet another delay:

SpaceX will likely try again on Tuesday night, but the company has not yet confirmed if it will open another launch window.

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WATCH: SpaceX Starship Flight 10 launch

Published

2 hours ago

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August 25, 2025

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Credit: SpaceX

SpaceX is set to launch its tenth test flight of the Starship program, with a launch window that will open at 6:44 p.m. local time, or 7:44 p.m. on the East Coast.

Starship’s tenth test flight was originally scheduled for launch yesterday with a one-hour window that opened at 7:30 p.m. ET, but it was called off 17 minutes before that window even had a chance to open.

Starship Flight 10 rescheduled as SpaceX targets Monday launch

SpaceX moved the flight to tonight. It was also originally scheduled to have a launch window at the same time as Sunday, but it was pushed back 14 minutes to around 6:30 p.m. ET. There are storms in the area, as well as clouds over Starbase, so there is the off chance for another launch delay.

There are several big objectives for this launch, including the expansion of the operating envelope for the Super Heavy booster. SpaceX says there are “multiple landing burn tests planned.”

The booster will also be performing a few in-flight experiments to help with data collection. Specifically, real-world performance data on future flight profiles and off-nominal scenarios will be on the list of things SpaceX will be looking for.

Starship itself will have a few in-flight objectives that include the deployment of eight Starlink simulators that are similar in size to the next-gen satellites for the internet service. SpaceX was set to test this with Starship’s seventh test flight, which occurred in January 2025. However, the task was abandoned as the vehicle was destroyed before deployment could occur.

Liftoff conditions are currently looking favorable, and SpaceX will be eager to improve upon its Starship launch program as CEO Elon Musk has big plans for it in the coming years.

You can watch the launch below via SpaceX:

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Tesla looks to expand Robotaxi geofence once again with testing in new area

It looks as if Tesla is preparing for its next expansion of the geofence, potentially moving toward a much larger service area that could eclipse 150 square miles.

Published

4 hours ago

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August 25, 2025

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Credit: Joe Tegtmeyer | X

Tesla looks to be preparing for the potential expansion of the Robotaxi geofence once again, as the company was spotted testing the suite in an area well outside of the Austin service area.

After it first launched the Robotaxi platform on June 22, Tesla has managed to expand its geofence twice, essentially doubling the travel area both times.

The most recent expansion took the size of the geofence from 42 square miles to about 80 square miles, bringing new neighborhoods and regions of the city into the realm of where the driverless vehicles could take passengers.

However, it looks as if Tesla is preparing for its next expansion of the geofence, potentially moving toward a much larger service area that could eclipse 150 square miles.

Over the weekend, one fan noticed a Robotaxi validation vehicle testing in Bee Cave, Texas, which is roughly 25 minutes from the edge of the current geofence:

Tesla has been testing vehicles in the western suburbs of Austin for some time, and it seems the company is laying some groundwork to push its geofence expansion into Plaid Mode as competition with Waymo continues to be at the forefront of the conversation.

Waymo has been expanding with Tesla for some time, as the pace of expansion for the two companies has been relatively accelerated for the past couple of months.

Tesla’s expansions of the geofence sent a clear message to competitors and doubters, but it is still aiming to keep things safe and not push the envelope too quickly.

The geofence expansion is impressive, but Tesla is also focusing on expanding its vehicle fleet in both Austin and the Bay Area, where it launched a ride-hailing service in July.

Tesla Bay Area autonomous fleet to grow to over 100 units: Elon Musk

Still, safety is the priority at the current time.

“We are being very cautious. We do not want to take any chances, so we are going to go cautiously. But the service areas and the number of vehicles in operation will increase at a hyper-exponential rate,” CEO Elon Musk said during the Q2 Earnings Call.

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