The conflicting requirements of low-cost and high-stealth aircraft remain unresolved. However, there may be a solution in new concepts offered by engine builders who suggest cutting costs by building more stealth into the propulsion systems and less into the airframe. One example of this strategy is the S-shaped engine exhaust. It was presaged by General Electric and Northrop Grumman's work on the B-2. Now both GE and Pratt & Whitney are developing more sophisticated versions, the ...


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