Hi John.
Post # 17 For minimum drag (no aileron or roll spoiler deflection) at VMCA
I would like to withdraw that statement. It was badly constructed.
On Boeings, you can feel the point when no aileron is required. (Hence no roll spoilers deployed)
On Airbus, you can't feel that point. (Hence Beta Target)
See:
http://www.dream-air.ru/new/pilotam/...or_support.pdf Page 139.
"Hence in order to indicate the amount of rudder required to fly properly with an EO at T/O, the measured SIDE SLIP index is SHIFTED on the PFD by the residual side slip computed value, and displayed in blue instead of yellow, and called BETA TARGET; by pressing the rudder pedal to center the BETA TARGET index, the pilot will fly with the RESIDUAL SLIP as required by the EO condition. Thus theA/C will fly at
constant heading with roll surfaces retracted."