From his site, he's leaning towards slushed Methane or Ammonia.
~Jon
On Tue, Dec 1, 2015 at 5:37 PM, Rand Simberg <simberg@xxxxxxxxxxxxxxx>
wrote:
Do we know what his proposed propellant is?
On 2015-12-01 15:43, Jonathan Goff wrote:
On a note somewhat related to stable, high-performance
monopropellants, Kevin Parkin just announced the start of a San
Francisco-based startup to pursue his previous Microwave Thermal
Rocket launch technology (which I think we discussed a bunch on
aRocket back in the day). Hard to get more stable than inert, and even
with Methane or Ammonia, the performance is still very respectable...
~Jon