What is the recommended fleet angle for a grooved drum?

• A. 0 to 0.5 degrees
• B. 0.5 to 2 degrees
• C. 2 to 4 degrees
• D. 4 to 6 degrees

Answer: (B)

The fleet angle is the small deviation of the rope’s path on the grooved drum from the drum’s centerline. Keeping this angle within a light range ensures the rope sits properly in the groove as it winds and unwinds, which minimizes uneven wear and keeps the rope aligned under load.

The recommended range is 0.5 to 2 degrees. This slight angle prevents the rope from climbing out of the groove and reduces lateral wear on both the rope and the grooves. If the angle is too small, the rope may not seat securely and can creep or shift under tension. If the angle is too large, increased lateral force causes faster wear, groove damage, and potential rope failure.