4 ms·

If all four on one side went out, I assume you'd be in big trouble.

• CarVac 9y ago
  And if one on one side went out, you'd immediately descend.
• FabHK 9y ago
  I'd imagine if two stacked ones go out, you'd be in trouble (as the centre of gravity will not be exactly in the intersection of the two diagonals).
  • SolarNet 9y ago
    Actually that's a benefit of the quad-copter design. It can sacrifice an axis of control in that situation (a "minor" one, like rotation about the gravity vector). In this case it would likely make the passengers sick, but it would still be able to fly in a controllable fashion. See this video: https://www.youtube.com/watch?v=ek0FrCaogcs https://www.youtube.com/watch?v=ek0FrCaogcs
    • anotheryou 9y ago
      with the counter-set props probably less spin even
      • FabHK 9y ago
        Yes, you go from 8 df in the control to 7 df (instead of from 4 to 3). So, you could basically "hang" the weight off the remaining diagonal, and then use the working off-diagonal rotors to keep roll/yaw/pitch in line. But then the rotors on the diagonal have to generate twice the force. I'd rather not be a pax in this when two rotors fail.