Even a duck against a fullly aluminum wing creates some impressive damage.
If I took a drone that size to the prop, landing gear or windshield while I was at full cruise speed I would have an immediate emergency situation.
It's the speed the planes are moving, more than the weight of the drone. 150-220mph impact speed depending on the small plane, even,if the drone is still.
--J
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"Praise be to our prophet, John Moses Browning, who hath bestowed upon us the new testament of shooting. Delivered unto us, his disciples, on 29 March 1911 A.D."