TC wrote:
Jonathan Silverlight wrote:
In message , Gareth Slee
writes
Any reason why the foam cannot be *inside* the fuel tank?

Because if anything came off, for any reason, it would go into the SSME?
I suspect that could spoil your whole day.

Liquid oxygen soaked into an organic material is an explosive.
So any internal insulation in the oxygen tank would have to
be non-organic.


In principle, you could immerse the LO2 tank in the LH2 tank, and insulate
the outside of the LO2 tank.