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 Boeing's swept-wing XB-47 won the Air Force's postwar bomber competition and swiftly transformed the XB-46 and the XB-48 into aviation footnotes. Six Allison J35-2 turbojet engines slung in pods beneath the swept-back wings gave the prototype Stratojet nimble performance, and helped to validate a design concept still widely used today.

 Although uprated J47-GE-3s were soon substituted, the B-47 also carried mountings for 18 solid-fuel booster rockets in the aft fuselage to shorten the takeoff roll.