Scramjet engines are theorized to be capable of reaching between Mach 12 and Mach 24. The fastest conventional air-breathing vehicles, such as Lockheed's SR-71 ("Blackbird"), travel at about Mach 3.2.

Curtis Berger could barely contain his enthusiasm as he briefed journalists about the first flight of Pratt & Whitney Rocketdyne's new "scramjet." The experimental aircraft hit Mach 5, or about 3,750 ...

The Air Force's experimental, scramjet-powered Waverider makes a short but historic flight in a test range over the Pacific Ocean. Jon Skillings is an editorial director at CNET, where he's worked ...

Air Force engineers are scratching their ends after a test flight of an experimental hypersonic X-plane ended last month prematurely when the vehicle failed to reach full power. A rocket successfully ...

In this Wednesday, May 1, 2013 photo released by the U.S. Air Force, the X-51A Waverider, carried under the wing of a B-52H Stratofortress bomber, prepares to launch for its fourth and final flight ...

Arcing through the hazy air above California, this is the incredible sight of a scramjet as it flies at six times the speed of sound. The experimental aircraft set a record for hypersonic flight, ...

Reuters reported that an experimental scramjet engine was successfully tested in a joint effort between the US and Australia defense scientists. It attained speeds of up to 6,835 miles (11,000 km) per ...

According to the U.S. Air Force, the flight test for the experimental X-51A WaveRider plane which could potentially travel up to 4500mph has resulted in failure. As previously reported on SmartPlanet, ...

An experimental jet engine has been successfully tested at speeds of up to 6,835 miles per hour, or 10 times the speed of sound, during trials in Australia's outback, defense scientists said on Friday ...

Scramjet from Popular Science. The first true reusable, free-flying scramjet could be Darpa's HTV-3X. It is also known as Blackswift. The HTV-3x could make its inaugural flight as early as 2012.

A team of engineers at the Air Force Research Laboratory and Air Force Test Center have set a record for the highest thrust produced by an air-breathing hypersonic engine in the military branch's ...