Unlike the China military industrial complex, Pratt & Whitney didn't have sources to buy or steal cutting edge information and technology, so you would expect more problems with original design and R&D.
Stony, I think the term is "borrow", in any reqard you are correct, all clean sheet designs have to be engineered, prototyped, and go through a trouble shooting phase, the F-100 was going into the most advanced fighter aircraft in the world, the F-15, and its kinematic performance was in a whole nother world, just as the F-22s remains today. I know that its difficult to remain objective in these discussions, particularly when others make false accusations to cover their own methodology, or defend the lack of progress, we all know what the score is, we don't need to move the goal post, so it is best to have a civil objective conversation to sort out these nuggets of truth. brat
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