B-29

The Boeing B-29 Superfortress is a four-engined propeller-driven heavy bomber that was designed by Boeing and flown primarily by the United States during World War II and the Korean War. It was designed for high-altitude strategic bombing and dropped the atomic bombs on Hiroshima and Nagasaki. The B-29 had state-of-the-art technology, including a pressurized cabin and analog computer-controlled fire-control system, and was one of the largest aircraft of World War II. Its development cost $3 billion, making it the most expensive of the war. The B-29 remained in service in various roles throughout the 1950s and a few were used as flying television transmitters. The aircraft was the progenitor of a series of Boeing-built bombers, transports, tankers, reconnaissance aircraft, and trainers.learn more on wikipedia