Its not really like sand, its more like toothpaste that is dried up. Its essentially a rocket fuel where the fuel and the oxidizer is premixed in the same 'past

Its not really like sand, its more like toothpaste that is dried up. Its essentially a rocket fuel where the fuel and the oxidizer is premixed in the same 'paste'. This makes clear why its a pretty dangerous substance. You need to be very careful manufacturing those, as they can explode pretty easily. The way it works, is that it burns from the insight out, like a hollow candle. The trajectory of the booster is basically molded into the hole in the middle. Once you light in on fire, the booster is gone fly its trajectory whatever you do. Here you can see all that pretty well: https://www.youtube.com/watch?v=k_JULlA_9Mo https://www.youtube.com/watch?v=k_JULlA_9Mo