Venus Aerospace has raised a $90 million Series B round led by Mercury Fund, with participation from Lockheed Martin Ventures, MESH, PEAK6, Draper Associates, Starboard Star Venture Capital and Green Sands Equity, the company confirmed on July 8, 2026 TechCrunch.

The Houston-based propulsion startup, founded in 2020 by CEO Sassie Duggleby and CTO Andrew Duggleby, builds a Rotating Detonation Rocket Engine (RDRE) — a design that sustains a continual supersonic detonation wave rotating through a circular combustion channel rather than relying on conventional deflagration. The round follows a $20 million Series A in 2022 led by Prime Movers Lab PR Newswire, a more than fourfold increase in disclosed institutional capital raised.

The company's SEC Form D, filed May 4, 2026, lists Sheila Menz as Secretary and General Counsel of Venus Aerospace Corp. SEC EDGAR, a filing that preceded the public Series B announcement by roughly nine weeks.

Venus has run approximately 600 tests of its RDRE hardware to date, with the longest continuous burn reaching 32 seconds, according to the company TechCrunch. The Texas Space Commission has awarded the company a grant to construct a larger test stand, expanding its ground-test capacity beyond current facilities.

The new capital will fund testing and development work tied to specific vehicle designs being developed with potential customers, per the company's disclosure to TechCrunch. Venus has not named those customers publicly.

Founded with an initial mandate to develop hypersonic passenger aircraft, Venus Aerospace shifted its primary commercial focus toward hypersonic weapons systems and military space vehicles following a flight demonstration in May 2025. That test marked the first time an RDRE had powered a rocket into flight, according to the company's account of the milestone.

The pivot from civil hypersonic transport to defense-oriented propulsion is not unique to Venus. RDRE technology has drawn interest from NASA, the Air Force Research Laboratory and multiple national labs over the past decade because of its theoretical efficiency advantage: a detonation-driven cycle can, in principle, extract more thrust per unit of propellant than a conventional rocket combustor by exploiting the pressure gain from the detonation wave itself rather than losing energy to constant-pressure burning. Getting that efficiency out of a lab rig and into a flight-worthy article has proven to be the harder problem, which is why 600 ground tests culminating in a 32-second burn is the more telling data point here than the funding figure itself.

Lockheed Martin Ventures' participation is the detail worth sitting with. Strategic investment arms of large defense primes do not typically write checks into propulsion startups unless there is a credible path to program insertion — either as a subsystem supplier or as an acquisition candidate down the line. Whether Venus ends up integrated into an existing missile or launch program, or continues to pursue its own vehicle designs independently, is not something the company or its investors have specified, and it would be premature to read the cap table as a signal of any particular outcome.

The broader propulsion funding environment has cooled and reheated in cycles over the past five years, tracking geopolitical demand signals for hypersonic and counter-hypersonic capability at least as much as pure technical readiness. Venus's jump from a $20 million Series A to a $90 million Series B, more than four years apart, sits within that pattern rather than outside it. What distinguishes this round from earlier hypersonic-adjacent raises is that Venus now has actual flight data — a single successful RDRE-powered flight, not just static-fire results — to point to, which changes the risk calculus for investors evaluating technical maturity against program timelines.

In this author's view, the more interesting long-run question is what happens to the RDRE's dual-use potential if Venus's near-term revenue concentrates around defense customers. Detonation-cycle engines that prove out reliability and burn duration in a weapons context tend, historically, to migrate toward civil and space-launch applications once the underlying combustor physics stabilizes — turbopump and materials lessons from military programs have fed commercial rocketry before. Whether Venus's founders retain enough independence, and interest, to eventually circle back toward the hypersonic passenger transport vision that motivated the company's founding is an open question the Series B does not answer, one way or the other.