Momentum is building for a propulsion upgrade of the 1960s-vintage, nuclear-armed Boeing B-52H Stratofortress, with the company proposing an eight-for-eight swap for engines in the 17,000-19,000-lb.-thrust range that were designed to power regional jets. In the mid-2000s, the U.S. Air Force was tinkering with four-engine options to replace the strategic bomber’s old and wheezy Pratt & Whitney TF33s using the Boeing 757-class Rolls-Royce RB211, Pratt PW2040 or General Electric CF6. ...

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