Originally posted by hyyyper
I suppose nobody has the actual link to the 'perfect loops'-paper?
The "perfect loop" was done based on a particle isntead of an entire train, thus it doesn't seem to be much different than, as I said, a "perfect loop" that could be made in Newton.
What's important here is that an accurate model is available, not just the loop itself. I think modern designing software has some similar FVD type of systems so that any designer could easily make such a loop. It just doesn't appear to have been done yet for the fact that hang time on the top of a loop is just plain awesome.
IMO, the "perfect loop" is one balanced to be as symmetrical as possible. The positive vertical G's leading up to it should calm down gradually until the very tip of the loop where the rider experiences close to weightlessness. Of course, in practice, no rider will get a perfect vertical G transition, but it's close.