This isn't directly relevant to your post, I know, but there exists a filmed interview with Igor Sikorsky in which he tells of someone who approached him and asked, quote "'Mr Sikorsky, can you tell me when the helicopter will be faster than the aeroplane, can you tell me that?' and I said, 'yes, I know that, and it is never'. And he asked me 'can you tell me when the helicopter will be faster than the aeroplane, can you tell me that?' and I said 'yes, I know that, and it is never. However, the helicopter can do things that nothing else can do, and that is when you use a helicopter'."