In rope bending around a surface, the minimum surface diameter should be at least how many times the rope diameter?

In rope bending around a surface, the minimum surface diameter should be at least how many times the rope diameter?

• A. 2x
• B. 3x
• C. 4x
• D. 5x

Answer: (B)

When rope is bent, the turning surface controls how gentle or sharp the bend is. A bend that is too tight concentrates stress on the rope fibers and can crush or fray the sheath, weakening the rope. Using a surface with a diameter at least three times the rope diameter gives a sufficiently gentle curve, minimizes peak fiber strain, and helps preserve rope strength as it passes around corners, fairleads, or edges. If the surface were only about twice the rope diameter, the bend would be much sharper and more damaging; larger diameters like four or five times are usually more than needed for this rule of thumb but aren’t required as the minimum.

When rope is bent, the turning surface controls how gentle or sharp the bend is. A bend that is too tight concentrates stress on the rope fibers and can crush or fray the sheath, weakening the rope. Using a surface with a diameter at least three times the rope diameter gives a sufficiently gentle curve, minimizes peak fiber strain, and helps preserve rope strength as it passes around corners, fairleads, or edges. If the surface were only about twice the rope diameter, the bend would be much sharper and more damaging; larger diameters like four or five times are usually more than needed for this rule of thumb but aren’t required as the minimum.