it is a solid rocket motor powered by potassium nitrate and sugar
it has two versions.
Stark 1
We couldn’t record each detail in camera and in-person due do delay in ignition we switched off camera and went close to it, and there was a sudden ignition due to which we could not notice the initial actions.
Observation: high smoke, CDN was thrown out of motor just after ignition which proves the factor thrust.it had a fire of around 6-7 inch in length. At the end there was no smoke. The burn time is approx 20 sec. a liquid output was observed. The liquid is assumed to be impure potassium carbonate(tested it with solubility).the body collapsed after all the burn.
Stark 2
stark 2 has the same fuel used in stark 1. and it also has few diffrences
It had a narrow ,less smoke and a linear one, due to huge thrust there was a forward motion of motor and it finally hit the rock, due to which front end seal was broken and a dent and a hole was found, most of the numbers needed was not able to record. Very less potassium carbonate was produced compared to stark 1.