WEST PALM BEACH, FL -- Pratt & Whitney has completed fuel performance testing of the F-35 Joint Strike Fighter engine -- the first step in a slate of iterative technology upgrades that could significantly improve engine efficiency and performance, the company said this week. The five-week, Navy-funded Fuel Burn Reduction testing verified the F135 engine upgrade can provide a 5 percent to 6 percent fuel burn improvement and a 6 percent to 10 percent thrust increase for all three F-35...
