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(Update: Sunday) SpaceX’s high-altitude Starship launch debut slips to Monday
Update #2: Per new Temporary Flight Restrictions, there’s now a chance that SpaceX has rescheduled Starship’s (now slightly less) high-altitude launch debut on Sunday afternoon, December 6th.
As always with experimental testing, uncertainty remains. Stay tuned for updates as we close in on Starship SN8’s 12.5-kilometer (~7.8 mi) launch debut.
Update: SpaceX’s high-altitude Starship launch debut appears to have slipped to no earlier than (NET) Monday morning, December 7th, and been reduced from 15 km to 12.5 km.
FAA-approved flight restrictions filed on December 2nd were retracted on December 3rd for unknown reasons, ultimately giving SpaceX several more days to prepare Starship SN8 for an ambitious high-altitude launch, coast, freefall, and landing attempt.
Meanwhile, SpaceX has also lowered Starship SN8’s apogee target to 12.5 km (7.8 mi) from 15 km, itself a reduction from 20 km made earlier this year. Why is entirely unclear but it’s likely that the company is in active discussion (and probably arguments) with the FAA, perhaps requiring a compromise to ensure regulatory approval.
It remains to be seen if SpaceX will perform any additional testing over the weekend or if the company will attempt to schedule Starship SN8’s launch debut on Saturday or Sunday. Stay tuned for updates and Elon Musk’s promised SpaceX webcast.
SpaceX has received FAA approval to attempt Starship’s high-altitude launch debut as early as Friday according to a Temporary Flight Restriction (TFR) filed on December 2nd.
SpaceX’s first high-altitude Starship TFR revealed that the crucial flight test is now scheduled sometime between 8 am and 5 pm CST (14:00-23:00 UTC) on Friday, December 4th, with identical backup windows available (and cleared with the FAA) on Saturday and Sunday. Originally scheduled as early as November 30th, the delays are less than surprising given the complexity and unprecedented nature of the flight test facing SpaceX.
Starship serial/ship number 8 (SN8) – the first functional full-height prototype – is tasked with launching from Boca Chica, Texas to an apogee of 15 kilometers (~9.5 miles) and dropping back to Earth to test an unproven approach to rocket recovery.
Often referred to as a bellyflop or skydiver-style attitude, Starship SN8 will attempt to freefall belly-down back to earth, using four large flaps to maintain a stable approach much like skydivers use their arms and legs to control heading and speed. When landing on planets or moons with relatively thick atmospheres, a controlled freefall could save Starship a huge amount of structural mass (no need for wings or actual airfoils) and propellant – a major benefit for what aims to be the largest reusable orbital spacecraft ever built.
Powered by three Raptor engines capable of producing up to 600 metric tons (1.3 million lbf) of thrust at full throttle, SN8’s launch debut will mark Starship’s first multiengine flight – a major milestone for any rocket prototype. SpaceX CEO Elon Musk also recently noted that Starship SN8’s propellant tanks will only be “slightly filled” for its 15 km launch debut, potentially resulting in an extremely healthy thrust to weight ratio at liftoff.
Based on several unofficial estimates, Starship SN8 is also likely to break the sound barrier on ascent, potentially putting the prototype through conditions similar to what an actual orbital launch might see at Max Q (the point of maximum aerodynamic pressure). Further adding to the daunting list of ‘firsts’, SN8’s 15 km debut will be the first Starship hop or flight with a nosecone, making it the first full-scale structural test of a nose section and the methods used to attach it to Starship’s tank section. It’s hard to exaggerate the number of things that could go wrong and the number of ways Starship SN8 could fail during its first flight.
In the interim, SpaceX has taken Starship’s launch delay as an opportunity to perform some kind of additional testing on the evening of December 2nd, involving some kind of cryogenic proof test (using liquid nitrogen) or wet dress rehearsal (WDR; using real liquid methane and oxygen). While there were initial signs that SpaceX would put SN8 through one or several more Raptor static fires before clearing the rocket for flight, it appears that those plans were cancelled earlier this week.
Less testing amplifies the risk that Starship SN8 will fail after liftoff, the probability of which Musk has pegged at ~67%. Regardless, SN8’s launch debut is bound to be spectacular and Starships SN9 and SN10 are nearly ready to take over wherever SN8 leaves off.
A Tesla Semi caught fire in Hayward, California, which caused both directions of traffic to shut down for hours before being completely reopened early on Wednesday, the California Highway Patrol said.
The fire occurred just after 5:30 local time in Hayward on Tuesday, as the Semi caught fire in the southbound lanes of I-880 before CHP officials made the decision to shut down both lanes of traffic due to potential risks from hazardous chemical smoke.
There were no injuries reported.
🚨 A Tesla Semi reportedly caught fire, with California Highway Patrol confirming. The Semi was on I-880 SB
An estimated 5,000 to 7,000 semi-truck and large commercial vehicle fires occur on U.S. roadways every year
— TESLARATI (@Teslarati) October 28, 2026
The cause of the fire is currently unknown, as neither Tesla nor the CHP have not determined a cause.
However, some images taken before the Semi was completely destroyed by the fire seem to indicate this might have been an older unit, as it appears to be one of the designs that Tesla shipped as part of its pilot program, before revising it and starting mass production just a month ago.
@Tslachan From on of the videos looks like it’s an old Semi (not the refresh version that recently started production) https://t.co/KzwmR2kXow
— Area Under The Curve 🎗️ (@AreaUnderCurve) October 28, 2026
At the time of publication, CHP had not returned our request for a comment for additional details, including the Semi involved and any potential collaboration on an investigation between the CHP and Tesla. We will update this story when we hear back from them.
The southbound lanes were reopened at 3:30 a.m. on Wednesday, with the northbound lanes opening last night a few hours after the fire began. The CHP did state that the lithium batteries were “incredibly difficult to extinguish,” according to NBC Bay Area.
The truck’s driver said that the Semi caught fire, but he did not have an explanation.
An estimated 5,000 to 7,000 semi-truck and large commercial vehicle fires occur on U.S. roadways every year.
Tesla’s launch of the “Emergency Drive Away” function a few months back offered owners a safe option to evacuate an area if they were in reasonable danger. The function finally got its first use in the real world, but it appears it was by mistake.
A video shared by u/Joshalander in the r/TeslaLounge subreddit recorded the instance from his vehicle and said the incident took place in Austin this past weekend during the city’s F1 Race.
“Was charging around 6 AM this past Sunday in Austin before heading to the F1 race and heard a pop. Looked over and saw the new emergency drive-away feature in action. Genuinely felt bad for the dude when he got out and realized what happened, since he looked exhausted and only seemed to half-read the prompts.”
🚨 Here’s the first look at Tesla’s Emergency Drive Away function in action:
Apparently this driver accidentally enabled it and drove forward; you can see the Supercharger pull with the car.
Tesla said previously this would cost up to $25k if not used properly. https://t.co/B4qQRrsO6B
— TESLARATI (@Teslarati) October 28, 2026
Emergency Drive Away unlatches the Supercharger connector from the vehicle, but still causes damage to both the car and the Supercharger. Tesla has said that it will cost up to $25,000 in repairs to have everything fixed back to normal.
Additionally, the company said that if it were not used in an emergency situation, the driver of the vehicle who activated the Emergency Drive Away feature would be responsible for all repair costs.
Tesla constitutes the following situations as reasonable justifications for activating the feature:
- You face an immediate threat to your life or personal safety.
- You must leave the area immediately.
- Exiting the vehicle is unsafe.
- Unplugging the charge connector would unreasonably delay your departure or expose you to a risk to your personal safety.
After using the feature, Tesla requires the driver to schedule Service so the car can be inspected.
News
Tesla’s Cybercab battery design could make robotaxis even cheaper
Tesla built the Cybercab’s battery pack with spare room for a future switch to LFP.
Tesla built the Cybercab’s battery pack with empty space inside it on purpose, and the reason points to a cheaper robotaxi down the road.
Robert Sumpf, Tesla’s director of mechanical design engineering for battery modules and packs, said the extra room beside and beneath the Cybercab’s modules was left there so the company can move to lithium iron phosphate cells later. “So, we protected this pack to go to an even lower energy dense chemistry as we scale and need to bring LFP into the platform,” Sumpf said in a Cybercab deep dive with Munro Live.
The Cybercab runs on Tesla’s own 4680 cells with a nickel chemistry today. LFP cells store less energy for their size, so a straight swap would cut range. The reserved space lets Tesla add more LFP cells to make up the difference. In return, Tesla would get cells that cost less, run cooler and survive more charge cycles. LFP became the most used EV battery chemistry in the world last year.
Not all of that room was planned for a chemistry change. Lars Moravy, Tesla’s Vice President of Vehicle Engineering, said part of it exists because “we didn’t need as many batteries as we thought we did.” Tesla told Sandy Munro in early 2025 that it was targeting a Cybercab pack under 50 kWh with close to 300 miles of range.
The pack also breaks from the structural design Tesla used in some Model Y and Cybertruck builds. Instead of potting hundreds of cells into one block, the Cybercab uses four separate, individually sealed modules, so a bad module can be replaced without scrapping the whole pack. Sumpf was blunt about the older approach, giving the Model Y structural battery “a grade D” because it was hard to build and nearly impossible to repair. He estimated a fully structural pack gains about 10% more cell volume, but said “the issue is the service cost.”
That cost matters more for a car that rarely sits parked. Cybercab chief engineer Eric Earley said replacing an entire pack “before half a million miles is a killer on cost,” which is why remanufacturing and serviceability were built into the design from the start.
The same Munro Live tour produced Moravy’s admission that the Cybercab line at Giga Texas is now outpacing Robotaxi deployments, along with a look at the robotaxi’s unorthodox paint process. Tesla is aiming to deliver the first Cybercabs to outside customers by the end of 2026, though Elon Musk has said the vast majority will stay owned by Tesla and run as a transport service.
Sumpf did not give a date for an LFP version, name a cell supplier or say how a chemistry change would affect range. For now, the 4680 cars keep piling up: Texas DMV records from Tuesday list 544 Cybercabs authorized for Tesla’s Robotaxi fleet, more than the 507 Model Ys on the same roster for the first time.
Tesla Semi catches fire in California: what we know
Tesla’s ‘Emergency Drive Away’ function gets its first use in the real world
