The Tulip sheaves are fixed sheaves that do not turn in the direction of manoeuvres since they accept quite different lead angles.
The choice of a Tulip sheave instead of a revolving block comes from the need to reduce bulk and weight.
The sheave, with an axial bearing in composite fibre and large round bearings (self-captive) in Torlon for side loads, is in anodized and Teflon coated aluminum and can handle very high loads.
The D=45 mm sheave is resin made with Delrin side ball bearings.
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