The ignition subsystem serves two functions. One is to pyrolyze the fuel grain so that it may combust with the incoming oxidizer flow. The second is to initially dissociate the nitrous oxide molecules so that the combustion reaction can take place.
The igniter is constructed from a section of a hobby rocket solid motor, a pair of e-matches, a pyrogen catalyst, and a thermocouple. The thermocouple provides digital feedback so the instrumentation is informed automatically of the result of ignition.