[obi1kenobi]

Even if you are looking at the turbines "edge-on," there's probably going to be a noticeable Doppler return as well.

Plastic drones with plastic propellers are still visible on radar because the tiny propellers spin super fast, so they light up like a Christmas tree on Doppler radar because the approaching vs receding velocities of the blades are so different.

[swores]

Any chance you can explain to this idiot (me) the flaw in my thinking? https://news.ycombinator.com/item?id=39903084

[obi1kenobi]

Seems like another user with way more experience than me did an excellent job explaining the situation -- I enjoyed reading their answer!