F (musical note)
FB (band), an electronic music collaboration of Benny Benassi and Ferry Corsten
Facebook, a social networking website, also known as FB.com
Friendship book, a booklet swapped amongst pen pals
Frostbite (game engine), a video game engine
F B, a Japanese military vehicle used for crossing difficult swampy terrain
Fast busy, or reorder tone, a type of telephone signal
Feedback, in signaling systems
Femtobarn, a small unit of area used in high energy physics
Fine business, amateur radio slang
Fluidized bed, a special technology used in energy, reactor, chemical engineering etc.
Hyundai FB, a series of buses manufactured by Hyundai Motor Company
Foreign body, any object originating outside the body
In 2001, Lockheed Martin began studies on the feasibility of the FB-22 as the company sought to leverage the design and capabilities of the F-22 Raptor. Experience gleaned from Operation Enduring Freedom in Afghanistan demonstrated the value of a bomber that could remain in theatre in the absence of surface-to-air missiles. The F-22, while designed as an air superiority fighter, embodied some degree of air-to-ground attack ability.
One primary objective of the internal studies was to exploit the F-22's air-to-ground capability while keeping costs to a minimum. To this end, the company devised several concepts that saw significant structural redesigns with respect the fuselage and wings, while retaining much of the F-22's avionics. With an early design, Lockheed Martin lengthened and widened the fuselage to increase the internal weapons load; it was later found that doing so would have incurred a cost penalty of 2530% in weight, materials and development. Instead, the company left the fuselage intact as it enlarged the wing to a more delta shape. The wing, which was around three times that of the F-22, enabled the storage of a much larger amount of weapons and fuel. Various figures give the payload of the FB-22 to be 30 to 35 Small Diameter Bombs; this is compared to the F-22's payload of eight of such 250-pound (110 kg) weapons. Unlike the F-22, the FB-22 was designed to be able to carry bombs up to 5,000 pounds (2,300 kg) in size. With stealth, the aircraft's maximum combat load was to have been 15,000 pounds (6,800 kg); without stealth, 30,000 pounds (13,600 kg).
Range was almost tripled from 600 miles (970 km) to more than 1,600 miles (2,600 km), which could have been extended by external fuel tanks. This placed the aircraft in the category of a regional bomber, comparable to that of the F-111, as it was intended to replace the F-15E Strike Eagle and take over some of the missions of the B-1 and B-2. According to the Air Force magazine, the combination of range and payload of the FB-22 would have given the concept a comparable effectiveness to that of the B-2 armed with 2,000-pound (910 kg) bombs. The design could also have been adapted to use a more powerful engine, such as the F-35 Lightning II's Pratt & Whitney F135, or the General Electric/Rolls-Royce F136. While an early FB-22 concept featured no tailplanes, the design incorporated twin tailplanes and likely would have fixed engine nozzles as opposed to the thrust vectoring nozzles on the F-22. The FB-22 was to have a maximum speed of Mach 1.92. Because the aircraft was to emphasize air-to-ground capability while maintaining stealth characteristics, the FB-22 would have lacked dogfighting capability.
One aspect that arose during the early stages of the design process was the consideration that Boeing would be responsible for the final assembly of the aircraft. At the time, Lockheed Martin was making the mid-fuselage at its plant in Fort Worth, Texas, while assembling the plane in Marietta, Georgia. However, since Boeing was responsible for the manufacturing of parts of the fuselage and more crucially, the wingsas well as integrating the avionicsit was considered prudent to give final assembly to Boeing.
Other than the wings, the aircraft would have retained much of the design of the F-22. This included 80% of the avionics, software, and flight controls. This commonality would have also significant reduced the costs of software integration.
In February 2003, during a session with the House Committee on Armed Services, Air Force Secretary James Roche said that he envisioned a force of 150 FB-22s would equip the service. In 2004, Lockheed Martin officially presented the FB-22 to the Air Force to meet its requirement for a potential strategic bomber as an interim solution to become operational by 2018. Because of the work already done on the F-22, the cost of developing the FB-22 was estimated to be as low as 25% of developing a new bomber, with development expected to be US$57 billion (2002 dollars), including the airframe cost of US$1 billion (2003 dollars). It was later revealed that six different versions of the bomber were submitted, as targets, payload and range had yet to be defined. In addition, as a stealth bomber, the FB-22 was designed to carry weapons externally while maintaining stealth with the assistance of detachable and faceted pods dubbed "wing weapons bay"; previously, an aircraft could only remain stealthy if it carried its weapons internally. However, the FB-22 in its planned form appears to have been canceled in the wake of the 2006 Quadrennial Defense Review and subsequent developments as the Department of Defense favored a bomber with much greater range.