Which types of rocket motors are not allowed for a Level 2 flier as a research motor?

In rocketry, particularly in the context of certification levels, specific restrictions are placed on the types of motors that can be utilized by flyers at various levels. For a Level 2 flier, the regulations prohibit the use of certain advanced rocket motor types due to safety and complexity considerations.

Research Black Powder Motors and Liquid rocket motors are classified under experimental and advanced categories that require higher levels of understanding, handling, and specific safety protocols. These motor types are more complex and can pose greater risks if mismanaged. As a result, their use is restricted for Level 2 certification holders, who are expected to demonstrate proficiency with less complex motor types before progressing to these advanced options.

Hybrid motors, on the other hand, are generally considered more user-friendly and are not explicitly restricted for Level 2 flyers. Therefore, they can still be used under this certification level.

The restriction on both Research Black Powder Motors and Liquid rocket motors ensures that flier safety is prioritized while also allowing a gradual escalation of complexity as one moves up in certification levels.