Oleg Zabluda's blog
Tuesday, August 14, 2018
 
"""
"""
But the [???] base heat shield, it's also a big improvement. And we replaced the old composite structure with a high-temperature titanium structure to support rapid reuse. The base heat shield will also be somewhat actively cooled with water. So we're finding that some things are really just, during the very high-energy phases of re-entry, ascent does not require them, but during the high-energy phases of re-entry, where you have a hypersonic shock-shock impingement, it generates a very hot spot, and you kind of have to use a high-melting point material, a high-temperature material, plus active water cooling in certain places on the base of the heat shield.
"""
https://www.reddit.com/r/spacex/comments/8itzz2/elon_musk_discusses_new_spacex_block_5_rocket/

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