Citation :
Elon Musk
This is a matter of execution, rather than ideas. Unless we make the heat shield relatively heavy, as is the case with our Dragon capsule, where reliability is paramount, we will only discover the weak points by flying. Right now, we are not resilient to loss of a single tile in most places, as the secondary containment material will probably not survive.
I will explain the problem in more depth with @Erdayastronaut
next week. This is a thorny issue indeed, given that vast resources have been applied to solve it, thus far to no avail.
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