> but during autorotation the terminal velocity is still much lower than if the blades were fixed it's not that straightforward, whether or not braking or free

> but during autorotation the terminal velocity is still much lower than if the blades were fixed it's not that straightforward, whether or not braking or freewheeling causes more drag depends on the prop. [1] https://www.rcgroups.com/forums/showthread.php?3753127-Freewheeling-prop-in-wind-tunnel-results/page2 https://www.rcgroups.com/forums/showthread.php?3753127-Freew... [2] https://www.peter2000.co.uk/aviation/misc/prop.pdf https://www.peter2000.co.uk/aviation/misc/prop.pdf