Sounds daft, but bear with me..
I remember reading a story once, possibly from the Korean war, where a heli was shot down and the pilots removed the damaged blade and managed to get it airborne again (albeit with some serious shaking!) to avoid capture by the enemy.
Anyone heard of this story? Do you think it's possible?
I might have read it in this:
http://www.amazon.co.uk/Tales-Helico.../dp/1560989521
But I don't have the book here so I can't check.