Hail was mentioned in the context of, &quot;I&#x27;m assuming &#x27;copter windscreens can handle hail?&quot;<p>I can guarantee you that a helicopter windscreen cannot handle 3lb hail. If such a hailstorm were ever encountered (unlikely, the record in the US is 1lb 15oz) then the helicopter would be completely destroyed.<p>If we consider a somewhat more sane hailstone size of 8cm, that has a terminal velocity of about 170km&#x2F;h and weighs about 1.5lbs. And a helicopter is not going to survive flying through a storm like that either. This drone, by comparison, weighs twice as much. The helicopter&#x27;s cruising speed is about 245km&#x2F;h, so that would be about the impact speed.<p>I don&#x27;t understand why anyone would think that a 3lb chunk of machinery moving at 150MPH relative to a helicopter wouldn&#x27;t go through the windscreen.<p>I also don&#x27;t understand why everyone in this thread is apparently so eager to minimize the risks presented here. There are some good arguments to be made about not over-regulating and about the low probability of an actual impact, but the attempts to downplay the potential effects of an impact should one occur are getting pretty crazy.