From what I can find, it looks as if the B-2 is designed for
fly-by-wire control, probably to keep it stealthy as much as anything.
The flying wing shape by itself does not demand FBW, as the XB-35 and
YB-49 designs of the 40's were controllable without computer assistance.


The B-2 has FBW controls and a 6000 psi hydraulic system to move the control
surfaces for a number of reasons, mainly stability and weight reduction. I
have several friends who have flown it and they generally describe it's flying
qualities as F-111-like. The B-35 and B-49 designs were unsuitable as bombers
because of lack of directional stability expecially on a bomb run. If you
notice, the competition (B-36) has a large vertical fin.

Steve