Re. Igor's test flying...
I read a history of helicopter test flying many years ago which (obviously) covered the great man's efforts. It reported, (paraphrased, not verbatim), that, after the first flight of the first machine, Sikorsky was asked how it had gone. His reply was that everything was fine and that next time out he would be trying to make the thing fly FORWARDS !!
Great man, marvellous machines <img src="smile.gif" border="0">