[SkyDancer]

In reading aviation history I believe it was said that the first Doodle Bugs were having flight problems so they made one that a pilot could sit in one to evaluate its performance and why it was acting as it was. I think a wind tunnel could have also figured out what was going on. IMHO

[Steely Tom]

That would be Hanna Reitsch.

[hoosierham]

The Nazis would probably have better used the resources to build more fighters.