Which of the following motor types is prohibited for a Level 2 flier to create and fly as a research motor?

A Level 2 flier in the Tripoli Rocketry Association is authorized to create and fly research motors, but there are specific restrictions regarding the types of motor combinations they can use. Research black powder motors and liquid rocket motors are not permitted for Level 2 fliers due to the complexity and associated risks involved in their design and handling.

Research black powder motors fall under the classification of high-power rocketry motors, and while black powder motors are common in lower classifications, creating a research variant requires advanced knowledge and safety protocols. Because of this, they are beyond the scope of Level 2 certification.

Liquid rocket motors involve handling volatile propellants in a liquid state, which adds layers of risk during construction and operation, requiring understanding of complex fluid dynamics and hardware systems that are not covered at the Level 2 certification level.

Hybrid rocket motors can be created and flown by Level 2 fliers, as they generally involve less complexity and risk compared to liquid and research black powder engines. Therefore, it's essential to understand that while both black powder and liquid rocket motors present significant challenges and are not allowed for Level 2 research motor design, hybrid motors are permissible within the scope of their training and certification.