Mass of fuel and oxidizer in 5m tank.

[Zatnikitelman]

Guys, I'm having real troubles figuring out the mass of LOX and LH2 given their densities, maximum allowable volume of a 5m cylinder, and a fuel to oxidizer ratio of 1:6. So far, for liquid oxygen, I've gotten Mass=(1141(19.634h))/(5/6) and Mass=(70.8(19.634h))/(1/6) where h equals the height of the individual tanks. The only place where they seem to intersect is at h=0. I'm incredibly confused on this one guys.
Thanks for any help!
Zat

 

[mjessick]

Remember this earlier discussion:
http://orbiter-forum.com/showthread.php?p=29632

You are ratioing the heights using masses. Use volumes.
M_lox/M_lh2 = 6
dens_lox/dens_lh2 = 16

Vol_lox/Vol_lh2 = (M_lox/dens_lox) / (M_lh2/dens_lh2)
= 6 / 16

so 6/22 for LOX and 16/22 for LH2