How is this different than birdstrike?
If I hit a 2kilo bird or 2kilo drone at the same relative velocity, do I really care? There are more birds at present. Large birds can cause issues - esp when they go into engine cores - as demonstrated by the American that landed in the Hudson River.
For some slightly sensational reporting of CFD results, see: https://vtnews.vt.edu/articles/2015/10/102815-engineering-jetenginedronestrike.html