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Quad-rotor control

Posted by Gwangtim Timothy Poyi on November 29, 2010 at 3:19am
Greetings all,
I just felt it was good to ask for your input or some clarification on a few areas where possible and connvenient for u.
1. I know that the Quad-Rotor helicopter manoeuvres by varying the thrust generated from each of its four rotors. With one rotor at each corner, differential thrust causes the airframe to rotate and change direction. It's not very clear how it is propelled forward or backwards or even sideways since the rotors are fixed-pitched. I really wish I could have a better understanding of this because most of what I have read do not go deep into explaining that.

2. A major challenge I have is to get the Helicopter to be able to test and know the speed and direction of the wind as it flies. My mathematics will be a lot easier if I can find a way of knowing the speed and direction of the wind as the helicopter flies. I am still trying to understand the DCM


I'll really appreciate any explannations or references that could help in making me understand these issues better.

Thank u in anticipation

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Replies

  • Developer
    Doug Weibel November 29, 2010 at 9:36am
    Forward, sideways and backward flight are accomplished by holding the copter with a pitch or roll angle. There is then a horizontal thrust component from the propellers. This is the same as a traditional heli - cyclic pitch control is used to tilt the rotor disk but it is the horizontal lift component and not the cyclic pitch which produce horizontal motion.

    Wind estimation from a quad platform is difficult and often much less necessary than you might think. There is no inherent stability to a quad so position hold control works equally well it it is level in no wind or tilted in a wind
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