Craig,
Actually, gaseous hydrogen is an awful cold gas propellant because while
its Isp is decent, its density is really poor. Unlike with LOX/LH2, I'm not
sure if it's ever worth it. Just as with cubesats, you're better off with a
denser gas like N2 if you want a pure cold gas system.
~Jon
On Wed, Jun 6, 2018 at 8:19 PM, Craig Fink <webegood@xxxxxxxxx> wrote:
On Wed, Jun 6, 2018 at 12:55 PM Paul Breed <paul@xxxxxxxxxx> wrote:
For a fin less tubular rocket using a single center line gimbaled thrust
chamber...
Using cold gas for roll control, how would one size the system?
Options for roll control:
Cold Gas
Hydrogen would be my choice for a Cold Gas Thruster. There are just so
many positive things about stepping up from Water Rockets to Cold Gas
Hydrogen Thrusters.
The ISP of a Cold Hydrogen is wonderful. It just starts out with so much
"head room" for increasing performance. Starting at almost 0 K propellant
to 0 C Exhaust Gas, hard to find a better ISP.
A cold gas Hydrogen Thruster could also be used for roll control.
For fun I, figured out how to do limited roll control of "a fin less
tubular rocket using a single center line gimbals thrust chamber" after
watching a Falcon 1 launch. But it has to be liquid and would be better as
part of baffle-less slosh controller
--
Craig Fink
WeBeGood@xxxxxxxxx
