What material must the cotter pin on the flight bracket be made of?

The cotter pin on the flight bracket must be made of stainless steel due to its superior strength, corrosion resistance, and durability. Stainless steel is ideal for applications in environments that may involve exposure to the elements, which is critical for safety equipment like the flight bracket used in a Skycoaster. This material ensures that the pin will maintain its integrity over time, resisting bending and wear, which is essential to securely holding components in place during operation. Unlike other materials, stainless steel provides the necessary reliability to withstand the forces exerted during a flight, contributing to the overall safety of the Skycoaster setup.