This is a cool composition. IMO the shot would have been better if the sky wasn't so blown out and hazy. A little more detail of the chopper would have made this more interesting to me.
Great DOF and detail. Would have been nice to see the helicopter higher on the horizon compositionally. Obviously, you have no control over this though ; )
Interesting effect on this shot, wish it was in color though. In this case the black and white just makes it look a little too busy. Good job though...