Venus Aerospace builds next-generation rocket propulsion systems for hypersonic flight, defense missions, and space vehicles. On July 8, 2026, the Houston company landed a $90 million Series B led by Mercury Fund as it pivots harder toward military and space customers after proving its rotating detonation engine in flight. The problem it’s trying to solve is simple to describe and brutal to fix: existing propulsion systems are often less efficient, less flexible, and harder to adapt for the new wave of long-range, high-speed vehicles. Venus was founded in 2020 by CEO Sassie Duggleby and CTO Andrew Duggleby, and the company now looks a lot less like a futuristic passenger-jet bet and a lot more like a serious propulsion supplier chasing near-term defense programs.
What does Venus Aerospace actually build?
At the center of the company is a rotating detonation rocket engine, or RDRE. Instead of burning propellant through ordinary subsonic combustion, Venus’s engine sends a continuous supersonic detonation wave around an annular chamber to generate thrust. The design delivers about 15% better efficiency than conventional rocket engines while staying compact enough for missiles and upper stages. It also fits orbital transfer vehicles and landers.
The commercial pitch is broader than “buy this one engine.” Venus is building what Andrew Duggleby calls a common propulsion architecture — one core system that can be adapted across different mission classes instead of forcing buyers to source a different engine for every vehicle. In practice, that means the same core technology is being pushed toward defense munitions and reusable uncrewed systems. Space hardware too.
There’s a second layer to the story. Venus also pairs the RDRE with its Venus Detonation Ramjet, or VDR2, an air-breathing ramjet designed to take a vehicle from runway takeoff into hypersonic cruise without a separate booster. The company has described that combined system as the route to speeds above Mach 6, with the long-term vision still pointing back to high-speed aircraft like its Stargazer M4 passenger concept.
Venus is trying to remove the usual tradeoff between performance and manufacturability. Its RDRE and VDR2 are built around 3D-printed parts and standard materials. They also have no moving parts, plus throttling and reusability. Before this, many defense buyers defaulted to solid rocket motors. They’re proven and simple, but fixed-thrust and expendable. Venus wants a liquid-fueled option that gives more control and can be produced from a more resilient domestic supply chain.
How was Venus Aerospace founded, and who are the founders?
The founding bet
Venus started in 2020 with a much more sci-fi sounding mission: build clean-flying hypersonic passenger aircraft. That wasn’t just branding. The company’s whole early thesis was that if it could crack a workable RDRE and pair it with an air-breathing system, it could change long-distance flight. Then the market talked back. After Venus completed its flight test on May 14, 2025, Sassie Duggleby said prospective buyers reacted with a very different question: “oh my gosh, you have a working RDRE, would you sell us one?” That was the moment the company’s center of gravity shifted from future travel to nearer-term defense and space programs.
Why Sassie and Andrew Duggleby made sense for this bet
This wasn’t a pair of outsiders wandering into aerospace. Sassie Duggleby had already worked as a launch systems engineer and mission management consultant at Virgin Orbit before founding Venus, and her earlier career included executive roles across fiber optics and biotech. Manufacturing startups too. She holds a biomedical engineering degree from Texas A&M and an MBA from Virginia Tech, and she now also serves on the Texas Space Commission.
Andrew Duggleby’s résumé is even more squarely propulsion-shaped. Before Venus, he was head of launch operations at Virgin Orbit, overseeing mission control and launch infrastructure. Ground systems too. He also led development and hot-fire testing of a dual-mode 3D-printed rocket engine in partnership with NASA, held faculty roles in mechanical engineering at Virginia Tech and Texas A&M, and co-founded Exosent Engineering. He’s a licensed professional engineer, a U.S. Navy Reserve lieutenant commander, and holds a PhD in mechanical engineering from Virginia Tech. That’s a lot of domain fit for a company trying to move a hard-to-control combustion concept out of the lab and into hardware.
Traction, funding, and the hard part that still matters
The headline technical milestone is real. Venus says its May 2025 test at Spaceport America was the world’s first successful flight test of a high-thrust RDRE, and it reached that point in just over 4 years after spending about $80 million in capital. The company has now run around 600 tests. That’s enough to show the core idea isn’t vapor.
But this still looks like a deep-tech engineering slog, not a straight line. Venus’s longest engine firing so far is 32 seconds. Customer goals require something more like 6 to 15 minutes. Sassie Duggleby put the core technical challenge bluntly: for years the work was basically “how do we keep this engine from melting,” and she said the company has solved that part. Short tests are one thing. A fielded system is another. That’s the gap this round is really about.
How does Venus Aerospace compare with Hermeus, GE, and solid rocket motors?
Venus isn’t alone in chasing hypersonic propulsion, but it is taking a different route. Hermeus is building high-Mach aircraft around hybrid turbine-and-ramjet propulsion and closed a $350 million Series C in April 2026 after reaching its first unmanned supersonic flight in May. That’s a vehicle company first. Venus, by contrast, is increasingly acting like an engine company that can plug into multiple defense and space systems.
Big incumbents are in the mix too. GE Aerospace demonstrated rotating-detonation ramjet engines in 2025, and Lockheed Martin said in January 2026 that it would continue that missile-focused maturation work with GE. So the “detonation propulsion” category is no longer a one-startup curiosity. Primes are here now.
Then there’s the most important legacy alternative: solid rocket motors. They already power a lot of missiles, they’re familiar to defense buyers, and they’re good enough for plenty of jobs. Castelion is leaning into that reality. It raised a $350 million Series B in December 2025 to mass-produce hypersonic weapons built around internally developed solid motors after more than 20 flight tests in 2025. Venus’s differentiator is that its liquid-fueled RDRE promises throttling and reusability. It also offers one engine architecture that can stretch from munitions to space applications. If that works, it’s a real edge. If not, incumbents still have the easier sell.
Why did Venus Aerospace raise $90M now?
Because the company is past the “can it light and fly?” phase and entering the much uglier “can it become a product?” phase. The new money is meant to fund testing and development on specific vehicle designs with potential customers, not just keep the lab busy. That’s a big shift. It means Venus is being pushed toward operational programs and qualification work. Buyer-driven requirements too.
The investor list says a lot. Mercury Fund led the round, and Lockheed Martin Ventures came back alongside MESH, PEAK6, Draper Associates, Starboard Star Venture Capital, and Green Sands Equity. Lockheed’s continued participation matters because it suggests the company sees Venus as more than an interesting science project. Mercury’s involvement gives Venus a strong Texas-centered backer as it builds manufacturing and test capability in Houston.
A bigger test stand is part of the roadmap too. This year, the Texas Space Commission awarded Venus up to $3.9 million to design, build, and activate an RDRE testing facility with a current end date of November 30, 2026. That doesn’t sound flashy. It’s crucial. Deep-tech aerospace startups usually live or die on infrastructure, and longer-duration burns won’t happen without more serious test hardware.
Why is hypersonic propulsion attracting money now?
Start with the defense budget. Congress’s research service said the Department of Defense requested $13.4 billion in procurement and RDT&E funding for offensive and defensive hypersonic warfare programs in FY2026. Even if only a slice of that eventually touches propulsion startups, it’s enough to explain why venture firms and prime contractors are paying attention.
The broader commercial numbers are moving in the same direction. One market forecast put the hypersonic rocket engine market at $7.59 billion in 2025 and projected it to reach $13.42 billion by 2030. You can argue about the exact forecast. But the pattern is obvious: governments want faster strike systems, launch providers want more efficient propulsion, and startups think the manufacturing stack has finally caught up with ideas that were mostly theoretical a decade ago.
That timing is why Venus’s pivot makes sense. Passenger hypersonic travel is still a long-horizon story. Defense and space buyers need range and domestic supply chains. They also need propulsion that can be built now. That’s where the money is.
What should investors and defense buyers watch next?
The next real checkpoint isn’t another flashy render. It’s burn duration. Venus Aerospace has already shown it can fly an RDRE. Now it has to prove the engine can run for minutes instead of seconds, survive the heat, and integrate into actual customer vehicles without turning every program into a custom science experiment.
That’s why this round matters more than the headline number. Venus Aerospace is no longer selling a future dream of two-hour international flights first. It’s trying to become a dependable propulsion vendor for defense and space customers who care about range and manufacturability. Test data too. Watch the larger test facility, longer burns, and whether one of those “would you sell us one?” conversations turns into a real deployed system.
Read how Prime Intellect raised $130 million in a Series A round led by Radical Ventures to help enterprises build, train, and deploy custom AI agents with a full-stack platform for compute, reinforcement learning, and model optimization.
FAQ
- What funding did Venus Aerospace announce? Venus Aerospace announced a $90 million Series B on July 8, 2026. Mercury Fund led the round, and investors included Lockheed Martin Ventures, MESH, PEAK6, Draper Associates, Starboard Star Venture Capital, and Green Sands Equity.
- How does the Venus Aerospace RDRE work? It works by using a continuous supersonic detonation wave that rotates through the combustion chamber instead of relying on ordinary subsonic burning. Venus says that architecture improves efficiency and keeps the engine compact. It also lets it serve missions ranging from munitions to orbital transfer vehicles.
- Who founded Venus Aerospace? Venus Aerospace was founded in 2020 by Sassie Duggleby and Andrew Duggleby. Both came from Virgin Orbit, where Sassie worked in launch systems and mission management, while Andrew led launch operations and had already worked on advanced rocket-engine development.
- Is Venus Aerospace a defense company or a space company? Right now, it’s basically both — with defense looking like the nearer-term business. The company began with hypersonic passenger-travel ambitions, but after its May 14, 2025 flight test, it shifted focus toward replacing solid rocket motors in weapons and supplying propulsion for military and space systems.
