What is the total length of rope needed for making a barrel hitch?

The total length of rope needed for making a barrel hitch is calculated based on the rope’s interaction with the barrel and the required wraps and connections. When forming a barrel hitch, the rope needs to encircle the barrel adequately to ensure a secure hold while also allowing for the additional lengths required for tying off and managing the hitch.

In this scenario, using two barrel lengths addresses the need for the rope to go around the barrel at two different heights. The inclusion of one circumference incorporates the complete wrap around the barrel's surface, ensuring that it has the grip necessary for stability. The four diameters factor in the additional length required for securing the hitch and creating a tight, effective hold around the barrel and its curvature.

This combination captures not just the basic dimensions but also the extra length necessary for tying and completing the hitch effectively. Therefore, the total proposed in this option accurately represents both the physical geometry involved and practical rigging considerations needed for a secure and functional hitch.