Houston Rocket Startup Raises $91M to Scale Engine
Aerospace suppliers should watch for component and testing demand as the engine moves toward manufacturing.
Updated on Nov. 6, 2026 in Startups
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Houston-based Venus Aerospace announced a $91 million Series B funding round on July 8, 2026, led by Mercury Fund with participation from Lockheed Martin Ventures. The capital is aimed at scaling its Rotating Detonation Rocket Engine toward manufacturable production, a development of interest to aerospace suppliers and propulsion-focused investors.
Why it matters
The round funds the step from a successful 2025 flight demonstration toward a scalable, manufacturable propulsion system, which is the stage where hardware startups typically face their largest cost and supply-chain challenges. Participation from a defense prime's venture arm signals that established aerospace players are watching the technology closely.
Venus Aerospace raised $91 million in its Series B round, with the company founded in 2020 and its RDRE flight demonstration completed in 2025. The source does not provide a prior-round comparator or valuation, and the round's investor group includes MESH, PEAK6, Draper Associates, Starboard Star Venture Capital, and Green Sands Equity alongside the lead.
The players
Venus Aerospace
A Houston-based aerospace startup developing detonation-based rocket propulsion and the proposed Stargazer M4 hypersonic passenger aircraft.
Mercury Fund
A Houston-based venture capital firm that led the Series B round for Venus Aerospace.
Lockheed Martin Ventures
The venture investment arm of defense and aerospace prime contractor Lockheed Martin, which participated in the round.
The details
The Rotating Detonation Rocket Engine uses a detonation-based combustion process rather than conventional steady burning. In the proposed Stargazer M4 design, the RDRE would provide initial acceleration after runway takeoff, and the aircraft would then transition to a detonation-based ramjet once it reached supersonic speeds. Converting a demonstrated engine into a repeatable, manufacturable product is the central engineering and capital task the new round is meant to address.
Timeline
2020: Venus Aerospace is founded by Sassie Duggleby and Andrew Duggleby.
2025: The company completes a flight demonstration of its Rotating Detonation Rocket Engine.
July 8, 2026: The $91 million Series B round is announced.
Early 2030s: The company has discussed a first uncrewed Stargazer flight test.
Market Landscape
The round places Venus Aerospace among startups pursuing next-generation propulsion as a commercial and defense supply category, with Lockheed Martin Ventures' participation indicating interest from an established prime. Its stated long-term goal of a hypersonic passenger aircraft remains a projection that depends on engine scaling and flight testing not yet scheduled beyond an early-2030s target.
For operators in aerospace supply chains, the funding signals rising demand for propulsion components and testing services as the engine moves toward manufacturing. Businesses that sell materials, machining, or test-facility services to hardware startups should watch for procurement activity tied to scaled production rather than demonstration-stage work.
The takeaway
The key operating lesson is that the gap between a flight demonstration and a manufacturable product is where capital requirements and supplier relationships become decisive. Operators in aerospace and defense supply should track whether Venus Aerospace begins issuing component or materials orders as the engine program scales.
What happens next
The company has discussed conducting its first uncrewed Stargazer flight test in the early 2030s, though no specific date was provided.
Further reading
For more on the local company behind this round, see Houston Startups, where founders and funding moves in the region are tracked.
Source note: This article includes information reported by Economic Times.
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