Birdwatch Archive

Birdwatch Note Rating

2023-08-29 21:04:15 UTC - NOT_HELPFUL

Rated by Participant: B230B42C143D6A41F9CAE5FB746497ABFEC38C21497C19E21D597609DDBBE982
Participant Details

Original Note:

The development of the propeller commenced in Europe: 1480 da Vinci sketches a helicopter. 1680 Robert Hooke, windmill vanes could move water. 1752 Bernoulli, vanes set at an angle of 60ยบ to both the arbor & the keel propel boats https://www.mh-aerotools.de/airfoils/prophist.htm

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