I didn't find any previous thread about this matter, so I hope none strangles me if I just missed it.
I am interested to know a little bit more about the theory of the initiation of dutch roll. I have a theory but I am not sure whether it's the correct one or not. So here we go (it assumes a non swept wing aircraft):
With the fact in mind that the air is not smooth, gusts hit us all the time and if one comes from the side it will give us a side slipe angle. Let us assume we have gust from the right giving us a right side slipe angle.
- The directional stability gives a right yaw into the wind. The outer (left) wing will move faster through the air and create more lift
and drag.
- The net result will be a roll to the right and a yaw to the left.
- When the aircraft now yaws left, the right wing will move faster through the air and we will have a roll to the left and yaw to right.
- The sequence is repeated.
How did that sound?
Now, your opinions
TIA