Pardon me dropping in on this but.... I looked at the link in post #13, and except for the biplane, there isn't a single swept wing in the entire collection!???

I see almost all the wings with a tapered leading edge, and straight trailing edges, but none of them have the charateristic of being swept, as illustrated in the pixs in post #16, where the trailing edge of the tip is AFT of the trailing edge of the root of the wing.

So what do you guys think you're talking about?