I managed to smack the tail with the rotors yesterday. I'd gotten myself into a vortex ring, so I nosed down to fly out of it but in doing that I was too close to the ground so I hauled back on the cyclic and collective trying to climb out of it and heard a BANG!
I was thinking, "there go my rotors" and I was reaching for ctrl+eee when I realized I was still flying. I flipped to F2 view and there was a big chunk missing from the front of the tail but the rotors were fine. Even finished the mission, Russians build those birds tough.