In article om,
says...

On 14-10-20 09:54, Jeff Findley wrote:

A friend of mine is working on this project:

Terrestrial Return Vehicle for International
Space Station National Laboratory
http://intuitivemachines.com/aerospace/trv/


The small return vehicle would stll need some form of de-orbit engine.
Would NASA/Russia allow a device that may have hydrazine as fuel to
enter pressurized section of ISS ?

I'm going to say no. I'd guess they'll use something like nitrogen
"cold gas" thrusters. If an N2 tank leaked, there would be no danger
from toxic fumes.

From a re-entry point of view, doesn't any type of vehicle require some
sort of attitude control engine to ensure it is aimed right just before
de-=orbit engine burn is made, and during initial stages of re-entry
when you have to ensure proper iroentation before aero=dynamic forces
starts to be strong enough to use aerodynamics for attitude control ?

Yes, you can see notional attitude control thrusters at the back of the
craft. Based on the pictures so far (renderings, really), I'm guessing
they're still pretty early in the design process. I have no real
knowledge of how far they are though as I know all of this stuff is
likely to be proprietary (for business reasons) so I'm not going to ask
my friend for any details beyond what has been released publicly.

Jeff
--
"the perennial claim that hypersonic airbreathing propulsion would
magically make space launch cheaper is nonsense -- LOX is much cheaper
than advanced airbreathing engines, and so are the tanks to put it in
and the extra thrust to carry it." - Henry Spencer