FVD's and HSAK are two very different formula's. HSAK is a circular formula in which you can make turns very easily. The beauty about them is that you can actually specify everything you want and then it pops out for you. FVD's are the same way in specificity, but not the same at all as far as formula goes. FVD's stands for Force Vector Designs. Its a formula that gives you complete control over your coaster, and more or less, keeps it within realistic standards. You can specify how high you want the forces to go, and your ride will not get any higher or lower than what you tell it to. It's an extremely intricate formula, but its very effective. It allows control like no other, and thats why it has so much precedences over newton 1 because you can actually specify your own time zones. You can tell the ride to hold 4 G's for 1.5 seconds, and then transition from 4 G's to -1 G's in a 2 second period. Mind you though, it does get annoying.
So, my friend came up to me the other day and asked if I wanted a frozen banana, and I said no, but I want a normal banana later, so... yea.
- RIP Mitch Hedberg