A possible contender to arm USAF’s next generation bomber has fired its scramjet engine for the first and completed a critical design review, according to a Boeing release. Air Force Research Lab’s Propulsion Directorate manages the X-51A WaveRider Scramjet Engine Demonstrator program for a consortium comprising USAF, DARPA, NASA, Boeing, and Pratt & Whitney Rocketdyne. The goal is to demonstrate hypersonic technology that Boeing’s Advanced Systems president, George Muellner, says could be used to deliver payloads to space as well as other atmospheric flight applications. He said earlier this year that it might well be adapted for the NGB.
The rate of building B-21 bombers would speed up if the fiscal 2026 defense budget passes. But it remains unclear how much capacity would be added, and whether the Air Force would simply build the bombers faster, or buy more.
