4 ms·

Autorotation? Sorry I don’t know enough about drone aerodynamics, but it’s something seen in helicopters. https://en.wikipedia.org/wiki/Autorotation https://en

• NovemberWhiskey 5y ago
  Not nearly enough energy in the rotor system of that kind of drone to manage an autorotation landing; and they lack a freewheeling system in any case.
  • schiffern 5y ago
    Not sure about these drones, but on my toy drone I can absolutely cut the power and let the wind autorotate the rotors while it falls toward the ground. No need for a freewheel, since the unpowered electric motors spin freely (which isn't necessarily true for a helicopter's engine). There's no collective so you can't "flare" for landing like a helicopter, but during autorotation the terminal velocity is still much lower than if the blades were fixed. The drones in this video fall a lot slower though. This looks like controlled descent, not autorotation.
    • 05 5y ago
      > 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
• taneq 5y ago
  Drones almost always use fixed pitch props which aren't capable of autorotation (in this sense anyway).
• deleted 5y ago
  [deleted]