Hey folks, I created and verified a model with hand calculations, and decided to re-use my same logic.. Which now is giving me false numbers. Was wondering if you guys could help me out. Setup/Verification (See attached Reaction_Forces picture): Body in motion being held down by straps. Uniform Center of Gravity (CG) in model. Reaction forces (in red) are found in top 4 corners, x,y,z for each. Moment Force is verified by summing cross product of each force reaction (x,y,z) and its relative locations from body CG. Resulting moment is 0.5% off my program approximation. Great! [reaction 1 cross product] + [R2 crossP] + [R3 crossP] + [R4 crossP] = One axis moment reaction. Perfect. Problem (See attached NEW_CG): Same body in motion. CG is now offset from exact middle of body. New CG. Reaction forces adjust accordingly as expected. Nice. Moment is predicted by program with a sizeable addition in one of the 3 axis.. Roughly equivalent total though. Hand calculated Moment, using same method as above with cross product of reaction forces and relative locations from NEW CG, is completely wrong. 55% wrong. Are there more than 4 reaction cross products now? Is there something I'm not taking into account? The body is now rotating slightly, I understand there will be 2 axis forces for moment now.. But my hand calculations are so far off I feel like I'm missing something. Any help would be appreciated!