6 ms·

Why not autorotation? https://wikipedia.org/wiki/Autorotation https://wikipedia.org/wiki/Autorotation Is it less mass and therefore momentum in the rotor/drive

• jacquesm 7y ago
  That needs forward flight to work. A quad copter does not have a glide ratio high enough that it would be able to start up the rotors to spin fast enough to get some lift out of them. A quad copter is best modeled as a brick with a magic anti gravity device attached, if the anti gravity device fails it is a suspended brick and gravity will soon assert itself. A real helicopter (or an auto-gyro) is best modeled as a rotating wing, as long as the blades rotate you can control the craft to greater or lesser extent. It still won't be pretty in a proper helicopter but at least you have a chance.
  • pr_nik 7y ago
    Additionally, you need "collective pitch" control, i.e. the ability to angle the rotor blades for windmilling and then for hover flight right before touchdown. Multicopters just have fixed-pitch rotors and rely on differential torque/thrust for attitude control and ascend.
  • jaclaz 7y ago
    >A quad copter is best modeled as a brick with a magic anti gravity device attached, if the anti gravity device fails it is a suspended brick and gravity will soon assert itself. Very nice definition. There isn't AFAIK such a neat distincion in English, in Italian the iron (the device you use for ironing, maybe flatiron?) has a specific name "ferro da stiro" so it is common to use it as a term of comparison for such a behaviour.