Hey, why not? It'd probably be able to outmaneuver, outfly and outgun most other things in the air. I imagine it'd be great for making speedy deliveries (for civilian use), and would be one step forward in the direction of 'future' transportation methods if it were made readily accessible to the...
Well, the best we could possibly do for it would make it a rudimentary plane with very little surface control. It'd be functional; just wouldn't be as effective at dogfighting as planes would be. So, then the problem would be that we need to fill the time gap between folding the helicopter...
Airwolf (from the T.V show Airwolf) is a Mach 1+ helicopter capable of reaching speeds up to Mach 2. For it's time, it's weapons system was pretty farfetched (had fourteen weapons systems overall, including chaffe and flares) at it's time.
I'm well aware of the limits of regular helicopters'...