

News
Ex-SpaceX engine expert to help design rockets built for launch on world’s largest jet
Stratolaunch, an aerospace company funded by Microsoft-made billionaire Paul Allen to build the world’s largest flightworthy aircraft, has announced a decision to build its own liquid-fueled rockets, to be air-launched from the aforementioned mega-plane.
Targeting an inaugural launch of the first version of the rocket – currently nicknamed “Kraken” – as early as 2022, Stratolaunch has chosen Jeff Thornburg, formerly SpaceX’s Vice President of Propulsion Engineering and the father of the company’s Mars-focused Raptor engine, to lead its foray into in-house rocket propulsion development and manufacturing.
Stratolaunch has confirmed what most people have long speculated: it’s developing its own launch vehicles for its air-launch system, including a reusable space plane that could eventually carry people. pic.twitter.com/nF9lKVe4xk
— Jeff Foust (@jeff_foust) August 20, 2018
But first: building the world’s largest aircraft
Stratolaunch’s first task at hand, however, is to begin flight-testing the largest (hopefully) operational aircraft in history, a prerequisite for the company’s longer-term orbital rocket and spaceplane aspirations. Nicknamed “Roc” after a mythical (and fictional) bird so large it could carry an elephant, the plane certainly lives up to its namesake. Featuring a full six of the same engines that power Boeing’s once-record-breaking 747 airliner and a wingspan that could easily fit three smaller 737 airliners with room to spare, it is genuinely difficult (if not impossible) to successfully convey the sheer scale of Roc outside of witnessing it in person.
Stationed in California’s Mojave Desert, the aircraft’s one and only copy is, for the most part, completed and has spent the brunt of 2018 conducting runway taxi tests, hopefully culminating in an inaugural flight test later this year or early next year. Designed to lift orbital-class rockets weighing as much as 250 metric tons (550,000 lb) to an altitude of at least 9100 meters (30,000 feet), the primary benefit of using aircraft as launch platforms derives from the simple fact that the atmospheric density at 30,000 feet is more than three times less than that at sea level. Similar to aircraft, rocket performance dramatically improves as atmospheric density decreases: less atmosphere means lower drag and pressure.
Rockets that launch from sea-level have to grapple with the difficulties of Earth’s relatively thick atmosphere at that height, with major launch events like “Max-Q” being big concerns almost solely because the dense air exerts major forces on launch vehicles and demands extreme measures like throttling down booster engines (very inefficient) and optimizing structures for aerodynamic efficiency despite the fact that rockets spend very little time operating in a significant atmosphere.
A launch pad without a rocket (sort of)
However, the simple fact of the matter is that billionaire Paul Allen’s colossal aircraft essentially does not have a single air-launched rocket in the world that can properly take advantage of its capabilities. Originally sized and designed with an air-launched version of SpaceX’s Falcon 9 in mind, that relationship folded amicably after roughly a year (2012), at which point SpaceX realized it would need to almost completely redesign a unique variant of Falcon 9. Your author will readily admit that they have admired the insanity of such a massive plane while still severely doubting its practical utility.
Thankfully, it appears that Allen is adamantly opposed to the idea that Stratolaunch is some silly whim to build the world’s largest plane. Rather, he is exceptionally reserved and pragmatic when discussing the aerial launch platform, according to a recent and extensive interview by Wired Magazine’s Steven Levy.
“Allen isn’t one to show exuberance, and when he speaks about the plane he focuses on its future utility. ‘When you see that giant plane, it’s a little nutty,’ he says. ‘And you don’t build it unless you’re very serious, not only about wanting to see the plane fly but to see it fulfill its purpose. Which is getting vehicles in orbit.’ – Paul Allen, 2018
- Stratolaunch’s Roc shown with a triplet of Orbital ATK Pegasus XL rockets. (Vulcan Space)
- Back in 2012, SpaceX briefly entertained the idea of a Falcon 9 variant optimized for air-launch, potentially including crew rating the rocket down the road. (Stratolaunch/Dynetics)
- The Roc is inconceivably vast. (Stratolaunch)
Currently, Orbital ATK’s (now Northrop Grumman Innovation Systems) air-launched Pegasus XL rocket is the only “customer” in the world that can realistically use Stratolaunch as a launch platform, not exactly an impressive or sustainable launch vehicle with a maximum performance of less than 450 kg (~1000 lbs) to low Earth orbit for an incredible ~$40 million per (expendable) flight.
To answer that call and ensure Stratolaunch’s utility, the company reportedly began seriously considering its own in-house expendable and reusable rockets and propulsion systems sometime in 2016, plans that have since grown concrete and been publicly embedded into Stratolaunch’s overarching mission. Nicknamed “Kraken” after the mythical sea monster, the company hopes to develop an initially expendable rocket system capable of launching 3400 – 6000 kg (~7500 – 13250 lbs) into low Earth orbit with single booster and triple booster variants. Further down the line, Stratolaunch is eyeing the design and production of a fully and rapidly reusable orbital spaceplane, potentially including a version that would carry astronauts into space.
- A concept video produced by Stratolaunch shows the Roc launching a Kraken rocket. (Stratolaunch, via Wired)
- A concept video produced by Stratolaunch shows the Roc launching a Kraken rocket. (Stratolaunch, via Wired)
- A concept video produced by Stratolaunch shows the Roc launching a Kraken rocket. (Stratolaunch, via Wired)
- SpaceX’s subscale Raptor engine has completed more than 1200 seconds of testing in less than two years. (SpaceX)
- BFS (circa 2017) shows off its complement of SL and Vacuum Raptor engines. SpaceX is moving back to something similar to this. (SpaceX)
Normally, one might simply roll their eyes at yet another startup touting small(ish) expendable rockets with first launches no earlier than the early 2020s – the market is getting to be absurdly and impossibly overcrowded at this point. However, Stratolaunch differs for one fundamental and reason: they have placed ex-SpaceX propulsion executive and expert Jeff Thornburg at the helm of the company’s freshly public rocket propulsion wing. While at SpaceX, Mr. Thornburg spent all but one of his five years with the company (2011-2015) single-mindedly focused on the development and engineering of all aspects of the Raptor rocket engine, a next-generation propulsion system designed to enable SpaceX’s sustainable colonization of Mars.
Raptor is an exceptional rocket engine thanks in no small part to Thornburg’s brilliance as a propulsion engineer, and that same brilliance and half-decade of experience at the most successful rocket startup in existence could ultimately prove a massive boon for Stratolaunch’s otherwise interesting but unexceptional expendable rocket concepts.
Put simply, under Jeff Thornburg’s direction and with access to founder Paul Allen’s considerable wealth, Stratolaunch is undoubtedly worth keeping a close eye in the future, both far and near.
For prompt updates, on-the-ground perspectives, and unique glimpses of SpaceX’s rocket recovery fleet check out our brand new LaunchPad and LandingZone newsletters!
Elon Musk
Elon Musk commends Tesla team on successful Robotaxi launch
Tesla CEO Elon Musk commended the company on the successful launch of Robotaxi.

Tesla CEO Elon Musk commented on the company’s launch of the Robotaxi platform, which officially went live to a small group on Sunday in Austin, Texas.
It is the first time Tesla has offered driverless rides through the ride-hailing platform it has worked to activate for several years, and it was overwhelmingly successful based on early reviews.
The launch was coupled with the release of the first-ever looks at the Tesla Robotaxi app, which does more than allow riders to summon vehicles for transportation. It also allows the rider to adjust climate settings in the car before it arrives for a comfortable ride, and it will sync entertainment and streaming settings to keep occupants entertained.
Tesla Robotaxi riders tout ‘smooth’ experience in first reviews of driverless service launch
The first rides are being performed with a safety monitor in the passenger’s seat. These monitors have no control over the vehicle, and are there just to ensure smooth operation.
The first reviews called rides “smooth” and “comfortable,” and commended Tesla for its hard work over the past few years to make this happen. Many were impressed with the cars’ ability to keep pedestrians safe, avoid congested parking lots, and the efficiency of the rides, as the time from the ride request to the Robotaxi accepting the ride was extremely fast.
Musk has been at the forefront of this operation for a decade, as Tesla has been working to release a version of the Robotaxi through the development of Full Self-Driving. This has been an effort that included seeking top-tier engineering talent and taking incredible leaps of faith, including switching to a Vision-only approach for Full Self-Driving.
Musk commended the Tesla team for its hard work:
Super congratulations to the @Tesla_AI software & chip design teams on a successful @Robotaxi launch!!
Culmination of a decade of hard work.
Both the AI chip and software teams were built from scratch within Tesla.
— Elon Musk (@elonmusk) June 22, 2025
It’s truly an incredible accomplishment, as many considered Robotaxi a “failure” despite it not even being rolled out. In May, we reported on media outlets calling the Robotaxi rollout a total failure, despite Tesla always maintaining the launch would happen in June:
Tesla Robotaxi deemed a total failure by media — even though it hasn’t been released
Hundreds of rides have already been taken, and there have not been many complaints. It’s an incredible jump forward for Tesla.
Elon Musk
Tesla Robotaxi riders tout ‘smooth’ experience in first reviews of driverless service launch
The first reviews of Tesla Robotaxi are in, and those riders are impressed and astounded with the smooth and comfortable nature of the service.

Tesla Robotaxi riders are touting their awesome experiences in their first rides using the automaker’s new driverless ride-hailing service, which launched to a limited number of people yesterday for the first time.
On Sunday, Tesla officially launched Robotaxi, its driverless ride-hailing service, in downtown Austin. A select group of people were chosen to receive early access to the program, as well as the new Robotaxi app, which is used to request a ride and will sync everything from climate preferences to streaming settings with each pickup.
Teslarati gained access to the Early Access riders program and the Robotaxi app, giving us a first-hand look at the experience. We will be in Austin soon to test out the Robotaxi fleet for ourselves.
However, those who were there for the initial rides on Sunday had nothing but great things to say. Hundreds of rides were taken during the first hours of the Robotaxi program, and neither the company nor the riders reported any issues.
Here’s what people said about their experiences:
- “Extremely smooth stops,” and great awareness of road conditions, including pedestrians, speed bumps, and busy parking lots, were all handled with ease:
Robotaxi slows down really nice for speed bumps. Extremely smooth stops as well pic.twitter.com/H8R2pXllWB
— Zack (@BLKMDL3) June 22, 2025
- Safe navigation around pedestrians who walked just off the sidewalk into the road:
Tesla Robotaxi stops for a man who veered off the sidewalk and onto the road as @JoeTegtmeyer and I were approaching Zilker Park earlier today. The stop was smooth and our Tesla Robotaxi allowed him to get back on the sidewalk and continue with our journey. This man is likely… pic.twitter.com/fozP6A7esK
— JC Christopher (@JohnChr08117285) June 23, 2025
- “Just as good as it is during the daytime” at night. There were no changes to report by riders who took rides during the day and evening:
Here is my experience in one of the first public nighttime @Tesla Robotaxi rides. It was smooth, comfortable and just as good as it is during the daytime. pic.twitter.com/7bDvVaWf3A
— Sawyer Merritt (@SawyerMerritt) June 23, 2025
- Avoided expensive and stressful parking at local tourist hotspots like Terry Black’s Barbeque:
Here’s a huge benefit of Tesla Robotaxi-
Dropped us off in front of Terry Blacks, crazy hard to find parking here, yesterday it took me almost 30 minutes to find a spot and today, I got dropped off right in front.
Didn’t have to pay for parking either. Game changing. @robotaxi pic.twitter.com/yZjQ8u4s8X
— Zack (@BLKMDL3) June 22, 2025
- “Comfortable and similar to existing Tesla cars with FSD,” intuitive and “surreal” experience:
My thoughts after 3 Robotaxi rides:
– Very smooth and comfortable. Similar to existing Tesla cars with FSD.
– App UI is intuitive but can use a couple upgrades (placing a pin anywhere, change trip while in car)
– It is completely and totally surreal.As a Tesla owner and…
— Farzad (@farzyness) June 22, 2025
- The app is quicker than other ride-sharing services. When a destination is chosen, Robotaxi is already on the way to your location:
My thoughts after 13 Robotaxi rides.
-Driving is very comfortable. It feels similar to our FSD, but braking is even better.
-The app is super fast, pick a destination and the robotaxi is simultaneously on the way.
-Yes our cars do well on FSD, but no one in the driver seat,… pic.twitter.com/pkuaXVxuMP
— Dirty Tesla (@DirtyTesLa) June 23, 2025
News
Tesla Robotaxi rollout proves that Elon Musk still delivers, even if it’s late
Tesla is also still the company that makes the impossible feel late.

It took a long time, but Tesla has finally successfully rolled out its dedicated Robotaxi service in Austin this weekend. The initial rollout only involved a small fleet of cars operating in a small geofenced area in Texas, but it is still significant.
It does, if any, prove that Elon Musk is still capable of delivering on his promises, even if they are late. Tesla is also still the company that makes the impossible feel late.
Finally, a Rollout
Elon Musk has been predicting a Robotaxi rollout for years, so much so that even avid Tesla supporters have grown quite wary of his constant predictions. After a while, Elon Musk himself admitted that he has become the boy who cried FSD, though he still maintained that self-driving was really just around the corner.
This past weekend, Musk’s predictions finally came true. Actual paying customers used Tesla’s dedicated Robotaxi service for a small flat fee of $4.20 per ride. Elon Musk seemed quite happy with the Robotaxi’s initial launch, as evidenced by his congratulatory message to the Tesla AI team on X.
No More Tesla Vision Debates
One thing that is evident in Tesla’s initial Robotaxi rollout in Austin was the fact that the debate surrounding Tesla’s vision-only approach is completely gone now. With actual Robotaxis operating around Austin, there are no more questions about whether cars can navigate city streets on their own using only AI and cameras. They can, and safely too, at least based on Tesla’s initial fleet of Robotaxis.
The Beauty of Normalcy
The Robotaxi rides from Tesla owners who were fortunate enough to experience the first driverless rides from the EV maker’s fleet were quite uneventful. Comments on social media platforms such as X observed that the Robotaxis operated safely and cautiously, and their driving was actually smoother than some human drivers.
That may not sound very exciting at all, but that’s the beauty of it. Tesla’s Robotaxi service is designed to look and feel natural to people. And so far, it appears that Tesla is accomplishing this with its Robotaxi rollout.
-
News2 weeks ago
I took a Tesla Cybertruck weekend Demo Drive – Here’s what I learned
-
Elon Musk2 weeks ago
Tesla tops Cathie Wood’s stock picks, predicts $2,600 surge
-
News2 weeks ago
First Tesla driverless robotaxi spotted in the wild in Austin, TX
-
Elon Musk2 weeks ago
X account with 184 followers inadvertently saves US space program amid Musk-Trump row
-
Elon Musk2 weeks ago
Tesla sues former Optimus engineer for stealing trade secrets
-
Elon Musk2 weeks ago
Tesla CEO Elon Musk reveals new details about Robotaxi rollout
-
News1 week ago
SpaceX produces its 10 millionth Starlink kit
-
News1 week ago
Tesla Robotaxi just got a big benefit from the U.S. government