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Full Transcript (below)
13. Q: Would some designs include the ability to change the heat shield, depending upon the mission, while keeping the basic ship the same except for the heat shield?
Balboni: I think the difference in the heat shield and requirements probably will drive different vehicles for say, the Mars entry. And then for the Mars return would probably be a different vehicle with a different heat shield. Mostly likely, rather trying to use the same vehicle over again. The other thing about an ablating material is that they tend to be one time use, and after that you would want to re-use an ablated heat shield. (30 SECONDS)