Anyone hear from ptarmigan, who hasn't posted here in a while? His web site doesn't appear to have been updated in the last year and a half, either.
I just finished reading some of his book, Angle of Attack, fished from a shelf in my study. He occasionally posted some of his articles here to open up some technical discussion. He and I sparred frequently, agreed on some things, disagreed on others, but his background, experience, and viewpoints were always a worthwhile exercise whether one agreed, or not.
His website, for those who haven't been:
https://airlinesafety.blog. It contains a lot of articles he'd post here, which are well worth the time to read.