The Boeing X-45A UCAV demonstrator has completed low-speed taxiing tests up to 25kt (46km/h) and is due to make its maiden flight in early 2002. Boeing and Northrop Grumman meanwhile are nearing the end of the initial phase of the UCAV-N advanced technology demonstration with the completion of baseline designs.
First flight of the X-45A has been delayed by the need for more extensive flight control software testing than originally envisaged. Progress so far includes completion of 25 out of the 115 planned demonstrations, the initial evolution of Block 2 software and further refining of the UCAV operational system. Mission software is flying on a T-33 support aircraft, which has been modified to simulate an UCAV.
Design work is also under way on the follow-on X-45B - to be more closely modelled on an operational UCAV. It will likely retain the X-45A's Honeywell F-124 turbofan at the outset, but will be configured to take a yet-to-be-selected production powerplant with a 660mm- (26in) wide fan. The X-45B will retain the outer mould-lines of the -45A, but feature a larger wing, an increased 8.5t maximum take off weight, low-observable treatment and integrated avionics, sensor and weapons suite.
Boeing and Northrop Grumman expect to move into the second phase of the UCAV-N programme next year with flight demonstrations of their respective X-46 and X-47 vehicles. Boeing's UCAV-N proposals differ significantly from the X-45A, and more closely resemble a miniaturised Northrop Grumman B-2 platform.
Source: Flight International
