When must a high power rocket launching device include a blast deflector?

A high power rocket launching device must include a blast deflector when it is necessary to prevent damage or reduce the risk of fire. The purpose of a blast deflector is to redirect the exhaust and energy from the rocket’s motor away from the launch pad and surrounding areas. This not only protects the equipment from potential damage due to the intense heat and force generated during launch, but it also helps to ensure the safety of people and property in the vicinity.

In scenarios where the rocket is using high thrust and producing significant exhaust, a blast deflector acts as a critical safety feature, as it can mitigate the risk of igniting nearby flammable materials or causing injury to bystanders. Therefore, its inclusion is essential whenever the launching conditions warrant it, regardless of other factors such as altitude, number of motors, or proximity to spectators.