upstroke

UK
/ˈʌpstrəʊk/
US
/ˈʌpstroʊk/

Library

The surprising secrets of hummingbird flight - Kristiina J. Hurme and Alejandro Rico-Guevara
turn their wrists during the upstroke
aerodynamics
phase ascendante
La phase ascendante est la partie ascendante d'un battement d'ailes.