T                   Entropy fix (efix)
1.4d0               gamma
0.                  xBreach
42390               mHermes (kg)
1.013000000000000d5 1.225000000000000d0 0.000000000000000d0 0.000000000000000d0 Hermes atmosphere
0.010000000000000d5 0.045600000000000d0 0.000000000000000d0 0.000000000000000d0 Vacuum approximation
       p (Pa)              rho (kg/m^3)        u (m/s)             v (m/s)

Mass calculation:

Hermes is a L=100m long x D=5m diameter cylinder with d=5mm thick walls made of Al, rhoAl=2700 kg/m^3
   mHull = rhoAl*L*(pi*D)*d = 21195 kg
   mPayload = mHull

   mHermes ~= 42390 kg