The space shuttle has heat shields. How does he expect to survive.
He’s not going to be reaching 22 times the speed of sound like the space shuttle.
Thing is...the Shuttle was coming in from 100 MILES in altitude at 18,000 miles an hour. Going that fast, the atmosphere going by at mach 20 or so would heat the outside to 2-3000 degrees.
Felix only plans to go from 120,000 feet to get to about about Mach 1.1. That isn’t going anywhere NEAR fast enough to cause heating of that sort. His biggest concern will be atmospheric pressure at the speed of sound, what aerospace engineers refer to as “Max Q”. I think they’ll be fine, but that remains to be seen.