X-47B

  Its an unmanned drone, not a stealth fighter. Its an attack aircraft. It cant even dance with a mig 19. Air force on the cheap. It can not travel at supersonic speeds and is only equipped with bombs.

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 (6,350.29 kg)
• Max takeoff weight: 44,567 lb (20,215 kg)
• Powerplant: 1× Pratt & Whitney F100-220U turbofan

Performance

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

Armament

• 2 × GBU-31 JDAM (905 kg each)(2000 lb)

Although admittedly, while it may not be a fighter class aircraft, it is a superior drone. Hydrogen fuel is not exactly a high energy substance. Its not exactly as efficient as jet fuel. What is the plane doing? Loitering at low speeds? Lets be honest, you expect this thing to take on a fighter aircraft?