[ERPS] Reentry shields...

[Ian Woollard]

Does anyone know any rules of thumb for a reentry shield? (I'm trying to design a reusable vehicle.)

i.e. if I have a vehicle weighing X, with a cross-section of A reentering with a speed R then the reentry shield needs to have a mass of... what?

The only thing I've found so far is a reference that Apollo used a shield mass of 15 pounds per square foot(!); but I'm unclear how to scale this. [presumably more area = less loading = less shield per square foot]

Anyone have know of any documents I can check out, or know any rules of thumb?


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