The Bell X-5 was the first aircraft capable of changing the sweep of its wings in flight. It was inspired by the untested wartime P.1101 design of the...

The Bell X-1 (Bell Model 44) is a rocket engine–powered aircraft, designated originally as the XS-1, and was a joint National Advisory Committee for Aeronautics–U...

for the Bell X-1, the first supersonic aircraft, and for the development and production of many important civilian and military helicopters. Bell also developed...

The Bell X-2 (nicknamed "Starbuster") was an X-plane research aircraft built to investigate flight characteristics in the Mach 2–3 range. The X-2 was...

The Bell X-22 is an American V/STOL X-plane with four tilting ducted fans. Takeoff was to selectively occur either with the propellers tilted vertically...

Diego–based biotech firm Illumina Xitami X5, an open-source Web server Bell X-5, an experimental aircraft X5, the IATA code for Afrique Airlines BMW X5...

The Bell 505 Jet Ranger X (JRX) is an American/Canadian light helicopter developed and manufactured by Bell Helicopter. The Bell 505 was unveiled at the...

The Bell X-14 (Bell Type 68) is an experimental VTOL aircraft flown in the United States in the 1950s. The main objective of the project was to demonstrate...

The Bell X-16 was a high altitude aerial reconnaissance jet aircraft designed in the United States in the 1950s. The designation of X-16 was a cover to...

feature further developed in later variable-sweep aircraft such as the Bell X-5 and Grumman XF10F Jaguar. Within nine days of the 15 July 1944 issuance...