I'm getting a bit confused on the difference between reaction wheels and momentum wheels. One of our objectives call for 3 momentum wheels for attitude control, with spin-up, spin-down, and reverse spin modes, as well as observing "long term, moderate rate spin tests". That's all the information we are given. The thing is, I've been getting mixed information on momentum wheels. Some places call momentum wheels and reaction wheels the same thing. Other sources, including SMAD, say reaction wheels are zero momentum systems where the wheels start at zero spin then increase to turn the spacecraft, while momentum wheels are only on the pitching axis and have a nominal spin rate that increases and decreases to turn one way or another.
My question is, can you use momentum wheels on each axis to control attitude? Or do you think it actually means reaction wheels? I personally thought that it meant use a momentum bias system but on three axes, but I could be completely wrong.