On Thu, Mar 12, 2015 at 8:49 AM, Dave McMillan <skyefire@xxxxxxxxxxxx> wrote: > > Well, as long as we're talking about purely *theoretical* fuels.... :) > I wish I could remember the one that George Herbert once proposed - a radioactive monopropellant, IIRC it had a half life of fifteen minutes and was hypergolic with it's daughter product. D.