Mach and THS attitude
Salute!
Somewhere in the cobwebs of this old brain it seems that temperature is a big player to get true mach, especially up high. An SR-71 buddy of mine reminded me of this awhile back, but what do WE know? And ask a few Concorde pilots about this. So if the Airbus wants to use only dynamic and total pressures to calculate mach, I am wondering a bit.
Secondly, manually trimming the THS for nose down might not help with a neutral stick. That's leading edge of the THS "up". OTOH, it could be the plane has the same characteristic as the Viper, in which we could command a brief nose up attitude and higher AoA, then the nose would fall down and we could "rock" the thing outta the deep stall. In our case the equivalent of the THS was leading edge up to get the nose down, but we pilots had cleverly managed to get real slow at an extreme pitch attitude and the thing settled into a comfortable deep stall with little wing rock and good directional stability.
jez a thot.