Hi, I thought I would spin off a separate thread for this one.
This is the original presentation by Robert Chung http://anonymous.coward.free.fr/wattage/cda/indirect-cda.pdf
It shows how elegant and simple the maths is to tease out a cda from a jumble of data.
Great share - thank you 
Excellent share. Thank you.
How have you found the results from this? Any good improvements?
The results gave me what I was looking for at the time. That is feedback on finding: the most aero position that I could which was comfortable enough to ride a 12 hr; the amount of aero I was compromising on by going for comfort; and the impact of helmet options, road / aero road / short and long tail TT, on outcome.
There was a whole ton more that I wanted to get into to further refine equipment options etc. but circumstances have prevented me exploring further.
very cool. thanks for sharing