g33,
regarding your question, "have you tested the windshield to destruction" the answer is no. With the strike of the 1 KG bird at 165 knots, the worst place is at a corner, and test failure is any penetration of any kind (a morsle of bird is failure). The windshield kept out everything, and at the worst place. If one were to speculate, a bigger bird at cruise speed (more like 150 knots) and that strikes the windshield in the center would possibly not penetrate. By 120 knots or so, protection is assured for the 1.8 KG bird, with zero penetration in the worst place.
The effects of the bird on the tail rotor are eye-watering. a 1 KG bird on the tail rotor will fail the blade at the root on every helicopter below about 35,000 lbs, unless they were specifically designed to withstand the shock. The energy of the bird on the main and tail tips is about 40,000 ft-lb, about the same as an A-10's cannon projectile on a tank! I wandered through the NTSB data base the other day and found three helos that crashed due to bird strikes on the tail rotor alone, and several more with birds on the main rotor that caused severe vibration.
I have posted an avi film of the S/H-92 tail rotor bird strike tests, it is about 900K, so be patient. It shows the tail rotor running in a bird stand, and red jelly globules are being tossed at it at 165 knots, followed by some pheasants:
http://www.s-92heliport.com/BIRD1.AVI
Here is a very short clip of the bird hitting the top of the windshield(upside down view!). It is 1 second because it is high res, so it is still 1.5 megs!:
http://www.s-92heliport.com/Bird2.avi