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General Electric and Pratt & Whitney have been selected over Rolls-Royce for the U.S. Air Force Research Laboratory’s Adaptive Engine Technology Development (AETD) program to mature fuel-efficient, high-thrust powerplants for post-2020 Lockheed Martin F-35 upgrades and sixth-generation combat aircraft...
The 48-month AETD has four goals. The first is to design a new combat-aircraft engine with 25% lower thrust-specific fuel consumption, but 5% more military power and 10% higher maximum thrust than the Pratt F135 now powering the F-35...
“We will take that engine through preliminary design review,” Reed says. The engine must be sized to fit in the F-35 with “only modest modifications,” he says.
http://www.aviationweek.com/Article.asp ... 15.xml&p=1
So... their trying again?
The sky is blue because God loves the Infantry.