She actually refers to a video of Rick Cavallaro who built the Blackbird and does an excellent job explaining how it works...
21:30 : model on level threadmill
36:00 : from tacking downwind to a propeller
38:00 : the yoyo
I had not seen this video nor the examples used in it when I drew mine. Yet it is the logical way to go if you understand the physics and try to explain them, I guess.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
Last edited by RedDevil; 06-30-2021 at 10:51 AM..
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