The United States defense apparatus has a propulsion problem, and rocket startups are racing to fix it. The Air Force Research Laboratory just exercised a $10.9 million contract option with Colorado-based Ursa Major to push forward development on the Draper liquid rocket engine. If you've been watching how fast defense procurement is shifting toward commercial agility, this move shouldn't surprise you.
The military wants hypersonic capabilities that don't take a decade and billions of dollars to build. Traditional defense contractors move like cruise ships, while private propulsion innovators move like speedboats. Ursa Major took its Affordable Rapid Missile Demonstrator (ARMD) powered by the Draper engine from a blank sheet of paper to flight-ready hardware in a stunning eight months.
What Makes the Draper Engine Different
Most people assume hypersonic weapons rely solely on solid rocket motors or massive cryogenic liquid engines. Solid rocket motors are great for sitting in a silo for years without maintenance, but they are notoriously hard to throttle, and the industrial base faces severe supply chain bottlenecks. Cryogenic engines perform well, but they require complex fueling processes right before launch, which ruins tactical responsiveness.
Draper solves this by being a storable liquid rocket engine. It stays fueled and ready for action over long periods, combining the tactical readiness of solid propellant with the performance control of liquid propulsion. It's throttleable, highly maneuverable, and built almost entirely using 3D printing.
When Ursa Major ran flight tests for the Draper-powered demonstrator, both flights reached supersonic speeds, with the second flight significantly expanding the vehicle's envelope. That kind of rapid iteration cycle exposes how sluggish legacy defense acquisitions used to be. Instead of waiting years between test phases, engineers gather real-world flight telemetry and tweak designs next week.
The Broader Shift in American Missile Defense
This $10.9 million infusion isn't happening in a vacuum. The Pentagon is desperately trying to diversify its propulsion base. For decades, a couple of massive primes held near-monopolies on tactical rocket motors and missile propulsion. When geopolitical tensions spike, those single-source vulnerabilities threaten national security.
We saw a similar signal when the U.S. Navy handed Ursa Major a massive $137 million deal for advanced solid rocket motor programs. The Department of Defense is systematically opening the door to non-traditional defense contractors because traditional manufacturing lines can't keep up with modern demand tempos.
Building missiles that cost millions less while maintaining Mach 5+ performance changes how combatant commanders plan operations. If a hypersonic system costs a fraction of legacy interceptors or strike missiles, militaries can buy them in volume rather than hoarding small, exquisite stockpiles.
What Comes Next for Ursa Major
The pressure is on. Ursa Major expects to fly a full-up hypersonic booster demonstrator by early 2027. That timeline is hyper-aggressive by aerospace standards, but the company has already hot-fired the Draper engine hundreds of times in testing environments.
Watch how fast these commercial-style engineering teams scale their manufacturing footprints. Berthoud, Colorado, and Youngstown, Ohio, are turning into hotbeds for high-rate propulsion manufacturing. If Ursa Major nails its upcoming booster tests, the defense industry will permanently abandon the old decade-long development cycle in favor of agile propulsion tech.
Check your assumptions about how defense hardware gets built. The startups are no longer just building lab experiments; they are reshaping the frontline arsenal.
