What is the best temp to cook the erythritol/KNO3 mixture? I made a crumbly mess that wouldn't burn at all.
According to wiki the melting point of Erythritol is around 121°C (250 °F). Which from memory, is pretty much correct. You can go higher without the risk of caramelisation.
btw. I assume you are using the "melted" method? If you are using the dissolved/re-crystallized it behaves very differently.
Like I pointed out above, the finer the KNO3, the thicker the mixture becomes. From my experience it was very hard to light. Nevertheless, in a larger motor, under more pressure, with a prime, I'm reckon it would work well.