Something I dreamt up sometime ago, sketched them back in the 80's before I found what computers were -- This was about the time Airwolf used to be on TV.
To give an idea of the size of the Heavy Lift helicopters, the car in the drawing is a 78 Camaro ( I measured up the wife's old car back then)
The top and bottom drawings are compound helicopters, while the middle drawing is of a more conventional layout although the little helicopter that is there is another compound one. It was while drawing up the little helicopter that I worked out that an Airwolf type helicopter hadn't a hope in flying (very fast that is), so I tried to come up with something that might, hence the bottom design.