Here you go, Jeff:
http://www.paceandcap.com/forums/sho...97&postcount=8
Arguably, Doc Sartin's 'crowning achievement' (at least, according to him).
There are also several Follow Ups devoted to the genesis and concept behind VDC (velocity relative to deceleration). Try browsing starting around Issue #70. If I can put my finger on the particular issues, I'll post them.
There has also been a lot of other discussion on this at Paceandcap.com. You could try a PaceandCap 'site search' in Google (like I did), as follows: 'site:paceandcap.com vdc formula', or other relevant terms.
The formula itself if actually not in the public domain, but the concept is.
cheers,
Ted