Scott Kozel wrote on Thu, 23 May 2019 03:29:15
-0700 (PDT):

On Thursday, May 23, 2019 at 12:11:18 AM UTC-4, Fred J. McCall wrote:

Now lets see how the old LEM stacks up. It's too physically large to
fit inside the payload fairing of anything other than SLS or Falcon
Super Heavy. It relies on a docking adapter that doesn't exist
anymore. It's battery powered and only has power for a 75 hour
duration.

What is proposed for longer stays ... an APU, solar arrays?


Fuel cells. You need something that can get you through lunar night.
Blue Origin's Blue Moon will use hydrogen fuel cells powered with boil
off from the propellant tanks.

It's made largely out of, well, tissue paper. Atmosphere
is pure oxygen at 5 PSI or so. It uses old hypergolic engines fueled
by Aerozine 50 and using dinitrogen tetroxide as the oxidizer.

The main advantage being non-cryogenic. What fuel and oxidizer would
be superior for a LEM today?


Blue Origin is using LH2/LOX, with the idea that eventually lunar ice
can be used to make the propellants rather than shipping them all the
way from Earth.


--
"The reasonable man adapts himself to the world; the unreasonable
man persists in trying to adapt the world to himself. Therefore,
all progress depends on the unreasonable man."
--George Bernard Shaw