I found this extension some years ago and was blown away with its possibilities. I even managed to make a rotating caterpillar track, but SP was buggy and limited.
One of my dissappointments was that you could not enter real physical values for mass, force, spring rate and friction so as to create a dynamic 3rd order mechanical system that could be verified by hand calculation eg the classic mass/spring and dash pot as we undergrads were plagued with solving
Has this changed at all?
I believe I would have to get a copy of su14 32bit for SP to work