Birdwatch Archive

Birdwatch Note Rating

2023-08-30 03:57:29 UTC - NOT_HELPFUL

Rated by Participant: 049E9E249CF132BD220934A2301413303C9F83D5CC0D861A6488BB5A903CCA42
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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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