quote:Also, regarding the 4000psi pressure adopted - the control surfaces most definitely did need powerful actuators; as you now know they were very active, especially on approach and transonic, and as well as IASs of up to 530kts you have all the lever arm changes brought by shifting centres of pressure over the surfaces caused by shockwave movements.unquote
Yup, I agree with that. I did the original control hinge moment calculations before we joined up with Sud, and the static hinge moments generated are quite impressive!
In fact the most critical zone is the transonic region and some (most) of the CG boundaries in the 'transonic corridor' are defined by hinge moment capability to provide the necessary manoeuvre 'g', especially with one system inoperative. The control rates aren't all that demanding, but the static hinge moment definitely was critical, and as you say, frontal area is everything and the jacks lie outside the wing section profile.
CliveL