On 1/07/2012 1:46 AM, Fred J. McCall wrote:
bob haller wrote:


wonder if a work around is possible to point with just 2 reaction
wheels?


Oh, good God! THINK, Bobbert! You need pointing control in 3
dimensions. You cannot do that with only two axis control So no, you
cannot 'work around' the laws of physics.

If the axes of rotation of the three wheels are orthogonal, and one
reaction wheel rotates, it changes the axes of rotation of the other
two. Indeed, the axes of the other two can be interchanged.

Sylvia.