Cowboy Space Big Iron Rocket Orbital Data Center Explained: 86-Metre Rocket, 2028 First Flight and the 20,000-Satellite Plan
Illustrative image: a heavy-lift rocket lifting off. Big Iron exists so far only as a design and renders — no flight hardware has launched yet. Image: Wikimedia Commons.
TL;DR: Cowboy Space Big Iron rocket orbital data center explained in one line: the US startup has unveiled an 86-metre stainless-steel rocket whose upper stage does not come home — it stays in orbit as a megawatt-class AI data center, with a first flight targeted for 2028.
📌 KEY HIGHLIGHTS
- Cowboy Space, founded by Robinhood co-founder Baiju Bhatt, unveiled Big Iron on 26 October 2026 — a rocket purpose-built to put AI data centers in orbit.
- The reusable booster uses nine methane-fuelled Clydesdale engines; the upper stage stays in orbit as a 132m by 73m satellite carrying five racks of Nvidia Vera Rubin GPUs.
- Each launch is designed to carry more than 15,000 kg to sun-synchronous orbit, and every launch grows the company's planned 20,000-satellite Stampede constellation.
- Cowboy has filed an FCC application for Stampede, launched a first test satellite on 1 October, and opened Big Iron Express launch services to outside customers.
- Nothing has flown yet: the first rocket is due by end-2027 and the first flight is targeted for 2028 — a timeline the CEO himself calls a stretch goal.
What happened?
Cowboy Space Corporation, the San Carlos, California company formerly known as Aetherflux, unveiled the architecture of its launch vehicle Big Iron on 26 October 2026, in a company announcement carried by Business Wire. The pitch is blunt, in founder and CEO Baiju Bhatt's words: "We set out to build data centers in space and found there weren't enough rockets to get them there, so we're building our own."
The company is not starting from nothing. It raised a $275 million Series B round in May, led by Index Ventures with backers including Breakthrough Energy Ventures, Construct Capital, Andreessen Horowitz, NEA and IVP. It launched its first satellite, Reason-1, on 1 October to demonstrate beaming laser power from orbit to Earth, and a second satellite, Reason-2, is slated for 2027 to run GPUs in orbit for commercial and government workloads. Big Iron is the vehicle meant to scale that experiment into a business.
Alongside the rocket, Cowboy introduced Big Iron Express, a commercial launch programme for government and third-party payloads — customers who need megawatt-class power in orbit, whether for compute or other uses. The company frames this as an answer to a national shortage of launch capacity.
Cowboy Space Big Iron rocket orbital data center explained: the numbers
| Spec | Big Iron |
|---|---|
| Height / build | 86 metres (282 ft), stainless steel, sized to the limit of road transport |
| First stage | Reusable booster, nine liquid oxygen / methane Clydesdale engines, 300,000 lbs thrust each |
| Second stage | Single Clydesdale engine; stays in orbit instead of being discarded |
| Payload | More than 15,000 kg to sun-synchronous orbit; Big Iron Express offers 18 tonnes to low Earth orbit |
| Orbital data center | 132m by 73m deployed in dawn-dusk orbit; five racks of Nvidia Vera Rubin GPUs; megawatt-class; six laser links |
| Timeline | First rocket by end-2027; first flight targeted 2028 (prototype summer 2028, first operational launch December 2028, per Aviation Week) |
Illustrative image: server racks in a ground-based data center — the kind of compute Cowboy Space wants to move into orbit. Image: Wikimedia Commons / NERSC.
Why the design is different
Most rockets treat the upper stage as a disposable delivery van: it drops off a satellite and burns up. Big Iron's upper stage is the satellite. Once deployed, it joins Cowboy's constellation, so every launch adds compute capacity rather than space junk. That is the whole business model — the company calls the constellation Stampede, and its FCC application covers 20,000 satellites.
To make that affordable, Cowboy designed parts to do two jobs. The rocket's stainless-steel skin becomes the data center's radiator once in orbit. The ammonia propellant doubles as coolant. The nitrogen that pressurises the second stage deploys the solar wings. Building a separate satellite with GPUs would need separate radiators, coolant hardware and deployment mechanisms — Cowboy's argument is that flying them as part of the rocket means not paying to lift the same metal twice.
The orbit matters too. Big Iron targets a dawn-dusk sun-synchronous orbit, which keeps the satellite in near-constant sunlight — steady solar power for a data center that cannot plug into a grid. The company says this design puts it "on a path to cost parity with terrestrial data centers," so orbital AI compute could eventually cost less than ground-based compute. That is a company claim about a future cost curve, not a demonstrated price.
Why it matters for USA readers
The United States is living through an AI infrastructure crunch: power, land and chips are the bottlenecks, and data-center power demand is now a national policy question. Cowboy's bet is that orbit solves the first two — sunlight is free and abundant up there, and there is no local planning permission to fight. If it works, the US gains another domestic path to orbit at a moment when launch capacity is scarce, plus a new option for government customers who want compute processed where data is collected, in space, with only results sent to Earth.
But the honest version of this story is shorter than the pitch deck. No Big Iron has flown. The Clydesdale engine has only had part of its combustion chamber built and tested — a roughly 30-person team did that in 90 days at NASA's Stennis Space Center, with full hot-fire testing planned for next year. Megawatt-scale cooling in orbit has not been demonstrated at this scale, and government customers, in the company's own telling, "want to see a completed rocket" before buying. Bhatt himself said the 2028 timeline requires "a lot of things to go right." Treat Big Iron as an ambitious, well-funded design — not as infrastructure that exists.
Should you care? Verdict
✅ Worth watching, not hype. The dual-use engineering is genuinely clever, the funding is serious, and the Reason satellites show the company can actually put hardware in orbit. But the leap from a tested combustion chamber to a 20,000-satellite megawatt constellation is enormous, and the 2028 date is a stretch goal by the CEO's own admission. Follow the engine tests, not the renders.
FAQs
What is Cowboy Space's Big Iron? Big Iron is an 86-metre stainless-steel rocket whose upper stage stays in orbit as a megawatt-class AI data center, carrying five racks of Nvidia Vera Rubin GPUs. Each launch adds one data-center satellite to Cowboy Space's planned Stampede constellation, instead of discarding the upper stage.
When will Big Iron fly? Cowboy Space aims to build its first rocket by the end of 2027 and fly it in 2028. Aviation Week reports a prototype flight in summer 2028 and a first operational launch in December 2028. The CEO has described the timeline as a stretch goal.
How big is the orbital data center? Once deployed in dawn-dusk orbit, each Big Iron upper stage measures 132 metres by 73 metres with solar wings extended, carries five GPU racks, and is designed for megawatt-class compute with six laser links.
What is the Stampede constellation? Stampede is Cowboy Space's proposed orbital data-center constellation, covered by an FCC application for 20,000 satellites. Its first satellite, Reason-1, launched on 1 October 2026 to test laser power beaming; Reason-2, due in 2027, will run GPUs in orbit.
Takeaway: Big Iron is the most literal answer yet to the AI power crunch: if you cannot build data centers fast enough on Earth, build the rocket that becomes one in orbit. The engineering logic is neat and the money is real — but until a Clydesdale engine hot-fires and a full stage reaches orbit, it remains a design with a deadline, not a data center.
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Sources
- Business Wire — Cowboy Space reveals Big Iron (company announcement, 26–27 October 2026)
- Aviation Week — Cowboy Space details Big Iron launcher plans (27 October 2026)
- Data Center Dynamics — Cowboy Space shows Big Iron (October 2026)
- Advanced Television — Cowboy Space shows off Big Iron (29 October 2026)
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