NASA has recently admitted that the X-34 project, touted with the X-33 as the route to reducing launch costs, is at an impasse. Readers will remember that in 1995, as a result of the great success of the DC-X reusable rocket funded by the Defence Department, NASA announced its own RLV program - with the X-33 and X-34 reusable rockets as its centre-pieces. Both were to start a series of progressive demonstration flights in 1999, leading on to low-cost launch vehicles.