[mkl]

The propeller method was explored in a fascinating series of videos by Veritasium and Xyla Foxlin:

https://www.youtube.com/watch?v=jyQwgBAaBag

https://www.youtube.com/watch?v=yCsgoLc_fzI

https://www.youtube.com/watch?v=VUgajGv4Aok.