The second flight test of an X-51A experimental hypersonic air vehicle was cut short when the vehicle’s scramjet engine ignited but did not transition to full power, announced Air Force officials Wednesday. “Obviously we’re disappointed and expected better results,” said Charlie Brink, Air Force Research Lab’s X-51A program manager, of Monday’s test off of the coast of California. “But we are very pleased with the data collected on this flight.” A B-52 released the X-51 at about 50,000 feet in altitude; the X-51’s booster then accelerated the vehicle to a speed around Mach 5 before it separated. While the vehicle’s scramjet engine subsequently lit on ethylene, it did not properly transition to JP7 fuel operation, said the officials. The vehicle then continued on in a controlled orientation until ocean splashdown. The first X-51 flight, considered overwhelmingly successful, took place in May 2010. The next flight test is tentatively scheduled for the fall.
Pentagon Releases Cost of Living, BAH Rates for 2026
Dec. 30, 2025
The Pentagon will pay cost of living allowances to 127,000 service members in the continental U.S. in 2026, an increase of 66,000 members in 2025. Airmen and Guardians across the U.S. will also receive an average increase of 4.2 percent for their Basic Housing Allowance, compared to the 5.4 percent…
