Greg- I trust your methodology better- there are no 'hidden' calcs and you are not depending on 'unseen code' for your parameters. Of course, I'm really old school and prefer it this way-so YMMV. Airfoiling and losing the lug may bring down your Cd a bit, maybe even to .65 ( I use an avg of .72 for my junk). Don't get me wrong- I luv OR and RockSim, but still like the long hand version better.
All persons, living or dead, are purely coincidental-Vonnegut
97% of the time, I'm right-the other 5% doesn't bother me.
There comes a point in your life that looks just like all the other points you didn't notice either.
If I had a nickel for every dollar I spent on rockets, I'd have more rockets.
You may have had more fun in your life than me, but the chaos was undeniable.