Nasa delays scramjet test
2004-11-16 09:09
Los Angeles - Nasa delayed a planned flight of an unmanned hypersonic jet designed to reach a record speed of Mach 10, or 11 263 kph.
A problem developed on Monday with the plane's avionics shortly before the flight, leaving too little time to reach the launch area as scheduled, Nasa officials said.
Engineers planned to try again on Tuesday to launch the plane off the California coast.
Just 3.6 metres long and 1.5 metres wide, the X-43A jet is mounted on a modified Pegasus rocket designed to be carried aloft by a B-52 aircraft and released at 12 000 metres.
The rocket will carry the X-43A to 33 000 metres and separate, allowing the craft to fly for about 10 seconds with its supersonic combustion jet operating.
The X-43A will then become a glider and perform manoeuvres until it splashes into the ocean. The craft was designed to sink and will not be recovered.
The first X-43A flight failed in 2001 when the booster rocket veered off course and had to be destroyed. The second X-43A flew in March and reached Mach 6.83, or nearly 8 045 kph, a record for an aircraft powered by an air-breathing engine.
Scramjet technology may be used in developing hypersonic missiles and aeroplanes or reusable space launch vehicles, with a potential for offering speeds of at least Mach 15.
Unlike rockets, scramjets would not have to carry heavy oxidiser necessary to allow fuel to burn because they can scoop oxygen out of the atmosphere.
On the net:
www.nasa.gov
- SAPA