Ronstan Series 40mm Orbit Block has a unique
sheave design with 12 gripping faces, which directly resist loaded line
movement and provide up to 25:1 holding power, nearly double that of its
This lightweight block delivers superior rope
wear performance and is lightweight. It has an on/off switch for manual
operation, and it can automatically engage when load is applied to the block.
In the Auto mode, it switches off when the load is released and allows the
sheet to run freely. This is especially handy for smooth bearaways and clean
tacks with asymmetric spinnakers.
The Series 40mm is ideal for Optimist, Laser,
470, and 49er mainsheet assemblies; mainsheet and spinnaker sheets on dinghies
with traditional and asymmetric spinnakers; sports boats; and small keelboats.
They are also used for control lines on larger yachts.