Is it possible to fly a conventional aircraft backwards in straight-and-level flight? Or is it just plain impossible? I was thinking along the lines of a turboprop like the Turbo Raven, with really good reverse thrust.
Exactly this has been done with indoor aerobatic rc-planes with a variable pitch prop. It lets you do some pretty impressive figures. So I'd say it's possible but I think no-one is crazy enough to do the same thing with an 1:1-plane.