Hypersonic vehicle (IMAGE) University of Arizona College of Engineering Caption Artist's rendering of the experimental X-51A Waverider, an unmanned, autonomous supersonic combustion ramjet-powered hypersonic flight test demonstrator for the U.S. Air Force. Credit U.S. Air Force graphic Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.