Elon Musk: “We are confident in making a fully reusable [orbital] heat…”

“Yeah, I mean, there are thousands of engineering challenges that remain for both the ship and the booster, but the single. Maybe the single biggest one is the reasonable orbital heat shield. We are confident in making a fully reusable [orbital] heat shield. but it will require many flights, many iterations to figure out where the weak points are in the heat shield, where we need to change the design, either strengthening the tile or changing how big the gap is between tiles, changing what's underneath the tile.” (13:22)

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