Birdwatch Archive

Birdwatch Note Rating

2023-08-29 23:06:58 UTC - HELPFUL

Rated by Participant: C58008E0C646BED489070BBAA460ECC4D06EF04B5C0DAB75AF06A00B0522F2D7
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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All Information

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