Tim Ellis
@thetimellis
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Cofounder, Board Member, & fmr CEO of @RelativitySpace. Building humanity’s multiplanetary future.
Los Angeles, CA
Joined January 2016
Today marks a bold new chapter for @relativityspace - read below: Some dreams are so audacious they’re worth dedicating significant years of your life to. Nine years ago, we scribbled Relativity’s wild vision on the back of a Starbucks receipt, never imagining how many
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Awesome update, proud of this team! And @ericschmidt great job and progress
The November Terran R program update is out. Progress is building across design, build, test, and launch as hardware and infrastructure ramp forward. 🏭 On the floor, teams completed all circumferential welds on the first stage tank and wrapped acceptance testing on the second
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It’s the season of giving… 🎁 Get FREE access to ANY model from the Dedalus API. Available until January 12th, 2026.
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Very excited to see this expanded customer partnership (+a previously unannounced launch deal with SES)!
We’re expanding access to orbit with @SES_Satellites 🚀 We’re proud to announce new Terran R launches with @SES_Satellites, advancing global connectivity through next-generation communications satellites. ➡️Learn more about the partnership: https://t.co/N5HDJGhXf7
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From Space Beach and the Space Coast, Terran R hardware and infrastructure are coming to life across design, build, test and launch. 🏭 On the factory floor teams installed the second stage downcomer and forward test adapter on the tank in preparation for acceptance testing,
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Really awesome progress and proud of the team seeing this come together!
Terran R build is continuing to ramp up this fall. From avionic builds to expanding of our machine shop capabilities and more. 🔥In prop, teams completed assembly of the second Aeon R engine for first flight and reduced average cycle times across key engine components by 50%.
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Alaska embodies the edge: vast, remote, and unforgiving. It demands technology that works where others can't. @AlaskaDOTPF's drone program reduced their critical decision-making window from 28+ hours to real time. Watch how they're reimagining what's possible with Armada at the
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In thrust we trust! August marked the completion of thrust structure build and the start of thrust structure testing on our newly activated structural test stand, alongside other exciting program milestones, including: - First stage tank welding underway, with initial
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Test like you fly. ✅ We’ve completed qualification testing for Aeon R with 60+ hot fires done in the qual campaign validating the engine design that will power Terran R to space. From design and build to test, this program milestone is the culmination of dozens of teams. 🎥
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July marked a major milestone for the Terran R program: qualification of the Aeon R engine. Stay tuned for a behind-the-scenes deep dive on the qual campaign coming soon. 👀
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From factory floor to launch site, the Terran R program is gaining serious momentum. Here’s the latest from May across design, build, test, and launch: 🖌️ Design: 17+ component-level Critical Design Reviews completed—rapidly releasing simpler parts like trays and manifolds ahead
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If matter can't be created from nothing then where did our universe of matter come from?
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Throttle valves, isolation valves, igniter solenoid valves – you name it, we've made it.
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Terran R is coming to life. We’ve advanced design fidelity across all subsystems, hit significant hardware and software development milestones, and moved into first flight production. Let’s take a look at what the team has been up to. 👇
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Flight hardware and in-depth update on the entire Terran R program!! SO proud of this team 🚀
Exciting times at Relativity! We’ve completed the vehicle-level critical design review for Terran R and begun flight production. It's full steam ahead towards first launch and beyond. 🚀 Catch up on the latest developments with our in-depth program update: https://t.co/rQB2GjS9KF
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Very cool
I’ve never been more thankful to be an iPhone user. Due to the lack of cell service, EVERYONE in Asheville NC right now on iOS 18 has been able to get messages out and in with the Satellite messaging feature. This is literally saving lives @Apple.
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Humans for scale! Terran R is optimized for the commercial satellite industry and ideal payload mass and volume
Time to take a look at Terran R’s payload envelope, designed to strike the perfect balance of payload capacity 🤝 launch frequency 🤝 mass-to-orbit efficiency. 📸: fairing with humans for scale 🚶
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Flight hardware for Terran R is in full swing! More updates over coming weeks, and continued big news 👀 @relativityspace
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Clean ! Making rapid progress on the entire Terran R program as we ramp up hardware production across all systems.
👀 Experience Aeon R’s first full-size, fully 3D-printed skirt in action during the latest thrust chamber assembly testing campaign @NASAStennis. *sound on
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3 full iterations on Aeon R engine design + test already. Quite different between designs, this means Terran R will be more mature and advanced for reliable reusability and performance by the time it flies in 2026
Making blue fire is fun. But knowing our Aeon R engines will effectively propel Terran R to where it needs to go is more fun. 🚀
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Full flight duration, full power.
On the test stand Aeon R fires at 100% power for 180 seconds 🔥 📍 @NASAStennis, R Complex 🚀 180 seconds of hot fire = the max duration for a Terran R first stage flight plus margin. 🔁 Test, learn, iterate, repeat.
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Rockets are complex and a lot needs to get done: production/test/launch infrastructure, regulatory, an experienced team, and win customers to prove what you’re building is actually ideal for solving their needs (prove product-market fit). And then, of course, all the rocket
🔥 @NASAStennis, #AeonR engine: Unleashing 100% power! 268K pounds of thrust full power hot fire in the books.
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