Grumman X-47

Northrop Grumman X-47B

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X-47B UCAS-D
The Northrop Grumman X-47B during its first takeoff at Edwards Air Force Base, California in 2011.
Role	Unmanned Combat Aerial Vehicle
Manufacturer	Northrop Grumman
First flight	4 February 2011
Primary user	United States Navy
Developed from	X-47A Pegasus

The Northrop Grumman X-47B is an American demonstration Unmanned Combat Aerial Vehicle (UCAV) which first flew in 2011. The X-47 project began as part of DARPA's J-UCAS program, and is now part of the United States Navy's UCAS-D (Unmanned Combat Air System Demonstration) program, which aims to create a carrier-based unmanned aircraft. Unlike the similar Boeing X-45, the development of the original X-47A Pegasus was company-funded. The X-47A's follow-on naval version is designated X-47B.

Design and development

The US Navy did not commit to practical UCAV efforts until mid-2000, when the service awarded contracts of US$2 million each to Boeing and Northrop Grumman for a 15-month concept-exploration program.^[1] Design considerations for a naval UCAV included dealing with the corrosive saltwater environment, deck handling for launch and recovery, integration with command and control systems, and operation in an aircraft carrier's high-electromagnetic-interference environment. The Navy was also interested in procuring UCAVs for reconnaissance missions, penetrating protected airspace to identify targets for following attack waves.^[2]
The J-UCAS program was terminated in February 2006 following the US military's Quadrennial Defense Review. The US Air Force and US Navy proceeded with their own UAV programs. The Navy selected Northrop Grumman's X-47B as its unmanned combat air system demonstrator (UCAS-D) program.^[3] The X-47B carries no weapons, but has a full-sized weapons bay. In order to provide realistic testing, the demonstration vehicle is the same size and weight as the projected operational craft.^[4][5][6]
The X-47B prototype rolled out from Air Force Plant 42 in Palmdale, California, on December 16, 2008. Its first flight was planned for November 2009, but the flight was delayed as the project fell behind schedule. On December 29, 2009, Northrop Grumman oversaw towed taxi tests of the aircraft at the Palmdale facility,^[7] with the aircraft taxiing under its own power for the first time in January 2010.
The first flight of the X-47B demonstrator, designated Air Vehicle 1 (AV-1), took place at Edwards Air Force Base, California, on February 4, 2011.^[8][9] The aircraft first flew in cruise configuration with its landing gear retracted on September 30, 2011.^[10]
The X-47B is planned to have a three-year test program at Edwards AFB and NAS Patuxent River, Maryland, culminating in sea trials in 2013.^[11] The aircraft will be used to demonstrate carrier launches and recoveries, as well as autonomous inflight refueling with a probe and drogue. The X-47B has a maximum unrefueled range of over 2,000 miles (3,200 km), and an endurance of more than six hours.^[12]

Variants

A mockup of the Northrop Grumman X-47B.

X-47A

Original proof-of-concept prototype with a 19-foot (5.9-m) wingspan, first flown in 2003.

X-47B

X-47C

Proposed larger version with a payload of 10,000 lb (4,500 kg) and a wingspan of 172 ft (52.4 m).^[13]

Specifications (X-47B)

General characteristics

• Crew: None aboard
• Length: 38.2 ft (11.63 m)
• Wingspan: 62.1 ft (30.9 ft folded) (18.92 m)
• Height: 10.4 ft (3.10 m)
• Empty weight: 14,000 lb (6,350 kg)
• Max takeoff weight: 44,567 lb (20,215 kg)
• Powerplant: 1 × Pratt & Whitney F100-220U turbofan

Performance

• Maximum speed: Subsonic
• Cruise speed: 0.45 mach
• Range: 2,100+ NM (3,889+ km)
• Service ceiling: 40,000 ft (12,190 m)

Armament
2 weapon bays, providing for up to 4,500 lb (2,000 kg) of ordnance^[14]
Avionics
Provisions for EO/IR/SAR/ISAR/GMTI/MMTI/ESM

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