US pursues low-cost hypersonic missile with 4,000-pound thrust engine

The U.S. Air Force is developing an experimental hypersonic missile called "Angry Tortoise," aimed at demonstrating a lower-cost approach to hypersonic weaponry and ballistic threat simulation. Central to the project is the Draper rocket motor, a 4,000-pound-thrust liquid-fueled engine using a hydrogen peroxide–kerosene mix that can be stored at room temperature for extended periods, enhancing tactical readiness. About 60 percent of the motor's parts are 3D printed, enabling significant cost reductions compared to current hypersonic propulsion systems. The program leverages components from the existing Economical Target-2 (ET-2) rocket to further cut costs while improving performance. The first test flight is scheduled for December 2025 at White Sands Missile Range, initially targeting speeds near Mach 2, with potential to reach Mach 4 or Mach 5 in future iterations. The project is currently a science and technology demonstration rather than an immediate weapons deployment, with