I just thought of something. What about the XF10F Jaguar. It had a wing-sweep system similar to the X-5 whereby the wing pivoted aft and the roots traveled forward to keep the C/L in the right space.
Why was the X-5 light in weight, yet the XF10F Jaguar enormously overweight?
R.C.
"That being said, I'd like to remind everybody in a manner reminiscent of the SNL bit on Julian Assange, that no matter how I die: It was murder (even if there was a suicide note or a video of me peacefully dying in my sleep), and should I be arrested or framed for a criminal offense, or disappear entirely -- I think we all know who to blame for it"