John R81
17th Nov 2013, 18:47
A friend brought this to my attention:
Video: A 500 mph Helicopter? | Flying Magazine (http://www.flyingmag.com/aircraft/helicopters/video-500-mph-helicopter)
Not a sleek-looking as the X2
Video: A 500 mph Helicopter? | Flying Magazine (http://www.flyingmag.com/aircraft/helicopters/video-500-mph-helicopter)
Not a sleek-looking as the X2