Andreas Maurer wrote:

Messerschmitt Me 321.

I've seen film of these and the Me 323 flying. They showed quite
alarming amounts of flexibility and general aero-elasticity when flying,
surely enough to affect controllability. I can't imagine how difficult
they must have been to fly.

I think this film is in the Imperial War Museum collection.

--
martin@ | Martin Gregorie
gregorie. |
org | Zappa fan & glider pilot