Is anyone familiar with the chemical/thermodynamic properties of Otto II fuel (a monopropellant used in torpedoes)? It is composed of nitrated propylene gycol with a couple additives that make it non-explosive: https://en.wikipedia.org/wiki/Otto_fuel_II.
It is a stable, non-cryogenic, low vapor pressure, "shirt sleeves" chemical blend...not exactly benign, but not nearly as dangerous as hydrazine or even high test peroxide. It does not require a catalyst to burn. I have no idea what its ISP would be in a rocket thruster application.
As one of the gaseous products is hydrogen cyanide, it's not hard to understand why it's not commercially available. Can anyone shed some light on this propellant and why it is not used in spaceflight applications?