Yoda2

I do find this subject interesting as well, however it all comes down to cost and practicality. We know all sorts of Gee Whiz stuff can be done in controlled conditions, though it's often not practical or features an Achilles Heal or some other gotcha that is not practical to overcome. So instead we settle/compromise with more traditional/simpler solutions and aerodynamic palliatives. How much more efficient can we make say a Citation X for example [Although far removed from its predecessor, the name that originally got chided about getting bird strikes in the rear] We can keep flogging these things forever I guess. We're still in the Stone Age and for no good reason. We might not need to reinvent the wheel, but we surely can build a much better mousetrap...