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The rope sheaves in Sepson’s snatch block have a ratio of 10 times the rope
diameter.
For xed installation on vehicles where the winch is used intermittently and during
short periods the ratio between sheave diameter and rope diameter should be 20 if
the rope turns more than 45°.
If the change of rope direction is small the ratio can be much smaller but note that
the rope will get damaged if the ratio is too small. For dimensioning of rope sheaves
diameters see DIN 15020.
4.5 Dimensioning of rope sheaves
Winch basics
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