Quick comparison of
the ATB program vs
pc-crash Multi-body simulation
first note that ATB is:

- ATB general purpose lumped mass program.png (29.78 KiB) Viewed 61 times
And here is a comparison of the models, look familiar?

- ATB v pc-crash multibody.png (187.43 KiB) Viewed 61 times
And here are the ONLY references pc-crash provides about their multi-body option:

- pc-crash multi body references.png (32.94 KiB) Viewed 61 times
why?