US firm's rocket engine that delivers 4,000-lb thrust to get upgrade

A Colorado-based company, Ursa Major, is advancing its Draper rocket engine, designed for space-based defense and hypersonic applications, following a $34.9 million contract from an undisclosed U.S. aerospace and defense firm. The Draper engine operates on non-cryogenic, non-toxic propellants and combines the storability of solid rocket motors with the higher performance, restart capability, throttle control, and maneuverability of liquid engines. This makes it suitable for rapid response and in-space maneuverability, addressing critical national security needs by providing enhanced responsiveness and flexibility against emerging threats in space and missile defense. Draper is notable for its affordable production, leveraging additive manufacturing with nearly two-thirds of its components made in the U.S., and a design that supports storage for at least 10 years. It has been hot-fired over 250 times, demonstrating safety, reusability, and reliability. The engine’s active throttle control allows it to simulate hypersonic threats more effectively than