What is the ideal angle for slack on the tether after a fist length?

The ideal angle for slack on the tether after a fist length is 90 degrees. This angle provides optimal tension and stability in a tethered system while ensuring that the force applied is directed safely away from the individual. At 90 degrees, the tether is fully extended, but not overly taut, which minimizes the risk of snapping back or causing injury in case of sudden movements or forces.

Maintaining the tether at this angle also facilitates better control and maneuverability. It allows the user to effectively manage slack and adjust their position or orientation without excessive effort or risk of entanglement. This principle is key in safety protocols, especially in urban air environments, where agility and responsiveness are vital for safe operation.

Other angles, while they may offer certain benefits, do not provide the same level of security and effectiveness in managing the tether’s slack. For instance, a smaller angle could lead to increased tension and reduced flexibility, while a larger angle could introduce instability and difficulty in controlling the tether's dynamics.