The X-47B is an unmanned combat air system carrier
(UCAS) is being developed by Northrop Grumman for the US Navy (USN). The strike fighter
size unmanned aircraft is currently in its demonstration phase. The unmanned aircraft
was first developed as part of the X-47 programme. Air worthiness of the X-47B unmanned combat air
system demonstrator was developed at an estimated cost of $813m.
The aircraft performed a successful initial test flight at Patuxent River, Maryland,
US, in July 2012. The X-47B is expected to enter active naval service by 2019.
Development history of the UCAS-D The X-47B UCAS was developed by the US Navy
as part of the unmanned combat air system carrier demonstration (UCAS-D) programme.
The programme aims to develop and demonstrate which fighter sized
tailless unmanned aircraft can be deployed from US Navy aircraft carriers.
The X-47B is a variant of Pegasus X-47A, which was developed as a joint USAF and USN programme,
called J-UCAS, in 2001. The programme was funded by the DARPA with Northrop Grumman as the main
contractor. In February 2006, however, the UCAS development programme was cancelled
for separate UAV development programmes by both the defence forces. Development of
the X-47B, which had started in June 2005, was temporarily halted following the cancellation.
The US Naval Air Systems Command (NAVAIR) contracted Northrop Grumman for the construction
and demonstration of two X-47B aircraft under the unmanned combat air system demonstrator
(UCAS-D) programme, in August 2007. The UCAS-D programme also aims to pave the way for developing
potential future carrier-compatible, unmanned systems with little risk.
Companies collaborating on the UCAS-D programme include Rockwell Collins,
Goodrich, Lockheed Martin, Parker Aerospace, Honeywell, GKN Aerospace,
General Electric (GE), Wind River, Dell, Hamilton Sundstrand, Pratt & Whitney, Eaton and Moog.
Design and features of the X-47B The tailless unmanned aircraft is 38.2ft-long
and has a wingspan of 62.1ft. The shape of the aircraft is designed for stealth or
low observable relevant requirements. The weapons bay can carry 4,500lb of weapons.
Operations of the computer-controlled X-47B
UCAS are smart and its flight control system is autonomous.
The navigation of the UCAS is controlled by hybrid global positioning system (GPS) vision-based
system. The flight path is preprogrammed and its operations are monitored by a mission operator.
The UCAS is equipped with electro-optics (EO), infrared (IR), synthetic aperture radar (SAR),
inverse SAR, ground moving target indicator (GMTI),
electronic support measures (ESM) and maritime moving target indicator (MMTI) sensors.
The UCAS-D will feature both probe-and-drogue of the US Navy
and boom-receptacle mechanisms of the USAF for autonomous air refuelling.
X-47B engine and performance details
The X-47B is powered by a Pratt & Whitney F100-PW-220U engine and exhaust system.
The aircraft has a high subsonic speed of approximately 0.45M
and range of roughly 2,100nm. The UCAS can fly to a maximum altitude of 40,000ft.
Two autonomous jet-powered X-47B aircraft were built under the UCAS-D programme.
The two demonstration vehicles have similar design and hardware features.
However, only one is equipped to test aerial refuelling tasks.
They can accommodate various kinds of sensors for reconnaissance, intelligence and surveillance and
have space for weapon systems. Payload is not installed on the demonstration units.
The first X-47B, including structural proof testing, was completed by October 2009. Named
air vehicle 1 (AV-1), the aircraft was transferred to Edwards Air Force Base (AFB) for flight testing
in July 2010. The second aircraft, named AV-2, arrived at the base for testing in March 2011.
The first flight test of the UCAS-D was conducted in February 2011.
The first catapult launch of X-47B was conducted at an onshore catapult facility at Naval Air
Station Patuxent River in November 2012. The first at-sea test phase involving a series
of deck handling trials aboard the USS Harry S. Truman (CVN 75) was completed in December 2012.
The aircraft will also be tested for launching, operating and recovering capabilities in a navy
carrier operable area of 50nm. The carrier launch, recovery, and deck handling tests were
completed in December 2012. The aerial refuelling demonstrations were carried out in April 2015.