Running Backstay
A backstay that can be tensioned or released during sailing to support the mast and control rig loads.
Running backstays are normally fitted as a port-and-starboard pair from the after part of the vessel to an upper mast attachment. The windward runner is tensioned while the leeward one is eased so the boom and sail can pass during a tack or gybe.
They may support an inner forestay, a fractional rig or mast bend, depending on the design. Incorrect sequencing can leave the mast insufficiently supported or trap a loaded runner, so crews need a practised procedure.
Key functions of a running backstay:
- Mast support: It helps to prevent the mast from bending aft under load, especially in strong winds or when carrying large sails.
- Forestay tension adjustment: By adjusting the tension in the running backstay, you can fine-tune the tension in the forestay, which affects the sail shape and performance.
- Balance: It helps to balance the forces on the mast, especially when using a staysail or other headsails that can create unbalanced loads.
When are running backstays used?
- Heavy weather: In strong winds or rough seas, the running backstay can be tightened to provide additional support to the mast and prevent it from bending or breaking.
- Upwind sailing: When sailing close to the wind, the running backstay can be used to increase the tension in the forestay, which helps to flatten the sails and improve upwind performance.
- Using a staysail: When using a staysail, the running backstay helps to balance the forces on the mast and prevent the staysail from pulling the mast too far forward.
Important considerations:
- Accidental gybe: Because running backstays are attached low on the mast, they can pose a risk in an accidental gybe, as the boom may hit the stay, potentially damaging the boom, mast, or both.
- Proper adjustment: It’s crucial to correctly adjust the tension in the running backstay to avoid over-stressing the rigging and mast.
- Maintenance: Regular inspection and maintenance of the running backstay are essential to ensure its safety and functionality.
