3. Last year, researchers at the University of Dayton set out to answer the question, "What happens when a drone collides with a plane?" Under a partnership with the Sinclair College National UAS Training and Certification Center, they unleashed a 2.1-pound recreational drone flying at 238 mph into the wing of a prop plane. The results are both stunning and terrifying. As the researchers describe themselves, "The drone did not shatter on impact. Rather, it tore open the leading edge of the wing as it bore into the structure, damaging its main spar." Their video on YouTube has amassed close to 950,000 hits over the past year.