"I thought something rotating as fast as a prop wouldn't allow water to collect and ice to form?"
Ice will form and will break off and hit the fusalage just behind the cockpit with a most frightening din!
Good movie that - the book is even better - covered in "Fate is the Hunter" as well.
Actually a number of years ago - late 80's I believe Air Classics mag. did a story about this event.
I believe it was called "Rescue at Lake O'Connor" - never did find a copy of it.
Anybody have one?