Just curious, some of them can get pretty big.
I can’t provide a cite (it was at least 20 years ago), but I distinctly recall a news item about a man in the DC area who was struck in the chest by a model airplane, and killed. You’re right, some of them are quite large, and they move along at a pretty good clip.
Here’s a very recent story about someone being killed by a model airplane. The victim was a 13-year-old girl (another article about it).
My father tells a story about a friend from his neighborhood back in the 50s. The kid had a wire controlled model airplane and he flew it into the electrical lines. The kid died. My father decided to become an aeronautical engineer because of the event.