The engine, known as the Integrated Powerhead Demonstrator (IPD), was being tested at NASA’s Stennis Space Center near Bay St. Louis, Mississippi.

The IPD is designed to provide nearly twice as much thrust as current space shuttle engines and to do it safer and more efficiently. It does this by using unique "full flow" preburners that provide more thrust than traditional rocket engines while operating at cooler temperatures.

http://www.space.com/businesstechnology/te...051019_ipd.html

New engine thruster would be safer (less heat), cheaper (less fuel) and more powerfull (twice for the same fuel).

Rodolfo