Additionally, if the "saucer" had any reality to it, the F-35[1] program would not be the mess that it is. It's performance is half the "saucer's" purported performance[2]: short takeoff / vertical landing (STOVL), half the maximum speed, slightly more range (which it is struggling to achieve), approximately half the service ceiling (and the range and service ceiling are probably for the conventional "A" model, not the STOVL "B" model).
[1] http://en.wikipedia.org/wiki/Lockheed_Martin_F-35_Lightning_...
[2] http://en.wikipedia.org/wiki/Lockheed_Martin_F-35_Lightning_...