What feature makes a pulley prusik minding?

A prusik-minding pulley is specifically designed to facilitate the use of a prusik knot while preventing it from jamming. The flat bottom of the pulley allows the prusik knot to travel freely along the rope when load is applied, ensuring smooth operation during rescue scenarios. When the prusik knot is under tension, it grips the rope, allowing for controlled movement. If the bottom were rounded, it could potentially cause the knot to slip or bind in a manner that leads to jamming, which would disrupt the system's efficiency and safety.

Choosing a flat bottom design is crucial in rescue applications where reliable ascension or descension is needed, and it allows for the easy adjustment of the prusik knot without risking entrapment or jamming. This ensures that rescue operations can proceed smoothly without unnecessary complications.