How stable can an hexa/octacopter be?

I am thinking of a project in which I would have to use an hexacopter to "watch" other moving things. It would have a camera attached to it's bottom. Somehow, it would have to be "locked" above the moving parts to film it and pass the image to the computer. There would be fixed points which would be used as references by the tracking software. The problem is that I don't know whether there is a way to keep a hexacopter stable enough in order not to have this area out of sight.

These are my questions:

- How does altitude affect the hexacopter's stability?

- How much wind is necessary to take my hexacopter totally out of position?

- What should I concern about when building an hexacopter in order to make it as stable as possible?

- What about another multirotor? Is and "octacopter" much more stable than an hexa?

Any other tips and helpful informations are welcome.

Regards;

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Replies

  • There is nothing inherently stable about multi rotors - if you want inherent stability you need a plane. Carl is correct in its all down to the controller and the accuracy of its sensors and the speed the props can react. All discussions (vibes, motor and prop sizes, sensors etc etc) fall out of that basic principle.

    Hex and octos allow finer control of movements (if the controller can) as there are more props to control, and more even thrust footprint. They do offer a modicum of redundancy in the event of catastrophic motor/prop failures - the main advantage IMO.
  • It is not really a matter of how stable another platform is,  It is how the controller is set up.  If the Pid's are set properly the camera is mounted to a roll tilt mount then you can get a very stable quad.  Hexas and Octo's are usually for lifting higher amounts of weight. But this is just my opinion. 

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