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Timestamps:
0:00 Intro
1:33 How do they work?
3:52 Manufacturing test samples is HARD
5:18 Toroidal props sound different (maybe better?)
6:57 Sound pressure level measurements
7:46 Check out the data
8:18 Thrust measurements
9:12 Efficiency measurements
10:35 Weight and moment of inertia
11:47 Conclusions
13:40 Brilliant! (.org)
14:43 Outro

Video sponsored by Brilliant.