This is by Charles Camarda, the former Director of Engineering at Johnson Space Center, heat shield expert, and shuttle astronaut. It is the document referenced

This is by Charles Camarda, the former Director of Engineering at Johnson Space Center, heat shield expert, and shuttle astronaut. It is the document referenced in by the OP here: https://news.ycombinator.com/item?id=47582043 https://news.ycombinator.com/item?id=47582043