How must igniters be wired for rockets powered by a cluster of motors?

When wiring igniters for rockets powered by a cluster of motors, the correct approach is to wire them in parallel. This ensures that each igniter receives the same voltage regardless of how many motors are used. If one igniter fails or does not fire, the other igniters in the system can still function, allowing the rocket to launch successfully.

Wiring igniters in parallel means that when the launch command is given, the current can flow to all igniters simultaneously, maximizing the chances of ignition for each motor. Additionally, this method reduces the overall resistance in the circuit, which can help improve the reliability of the launch sequence.

In contrast, if the igniters were wired in series, the voltage would be divided among the igniters, and if any one igniter does not ignite or has a higher resistance, it can prevent the entire system from functioning, leading to a failed launch. Therefore, the preferred and most reliable method when launching rockets with multiple motors (clusters) is to wire the igniters in parallel.