I have a model that "flies" along Y-axis. The model is oriented so
that I input the negative speed. When I calculate Y-component of
force, it always in negative range. I used to deal with this
problem (SW2008) by adding one more coordinate system with Y-axis
opposite to default Y-axis.
Now (SW2009SP2.1) try this trick and it doesn't work. I add two
Y-component of force. One for global coordinate system and one one
for my coordinate system. The results are absolutely identical