Originally Posted by Mr Vortex
I'm wondering that does the auto-stab function in yaw axis does apply some
rudder when pilot fly the aircraft by his hand to prevent the sideslip or
dutchroll or not?
Also, does the auto stab does "modify" some pilot input to minimize the effect
of the turbulence all the time when airplane encounter the turbulence or only
when the AP are in the "TURB" mode? Does it help to reduce the stress on the
aircraft like the "load alleviation" on the moder aircraft like A380?
And final the final question, how the camber help to reduce the shifting
position of the center of pressure on the Concorde and if possible where is it
on the wing?
Firstly; Thanks AZR!
Then, yes the autostabiliser does provide yaw damping to control the Dutch roll, but there was also (from memory) some roll damping.
No, there is no load alleviation function. Concorde had a very low aspect ratio wing which gives in turn a very low lift curve slope, so the loads coming from hitting gusts are quite modest and load alleviation was not needed. The autostabiliser was working all the time, not just when A/P was engaged. Since the span was also low the manoeuvre bending moment was also small so again load alleviation was not required. BTW, I believe that the A380 load alleviation is just this manoeuvre case not gust loads. The A320 had gust load alleviation on early models, but it proved to be a pain in the neck and was gratefully dropped when the MTOW went up and made manoeuvre loads the critical design case.
Finally, the camber is spread all over the wing. In cross section it looks like a banana with the bent bit like a shallow 'U' and the leading edge drooped downwards, so the whole thing lookss like a distorted 'S'
CliveL