En mécanique, l’ hélice est un dispositif formé de plusieurs pales disposées régulièrement autour d’un axe. Lorsque son axe entre en rotation, ce système décrit des hélices dans un fluide en avançant perpendiculairement au plan de rotation, grâce aux pales orientées suivant un certain angle de calage qui prennent appui… Lire la suite… →
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