How to Choose and Replace a Headsail Furling Line

A worn, undersized or incorrectly routed furling line can make an otherwise good headsail furling system difficult to operate. When replacing the line, the important factors are the furler model, specified line diameter, drum capacity, required length and deck routing.

Always start by identifying the furling system and checking the manufacturer's specification rather than choosing a line diameter from yacht length alone.

Choosing the Correct Furling Line Diameter

The correct diameter is primarily determined by the furling system. A line that is too large can reduce drum capacity, while one that is too small may be uncomfortable to handle and may not suit the line guides, blocks or drum.

For example, current Seldén Furlex specifications use the following furling-line sizes:

Older Furlex models and furlers from other manufacturers may use different sizes, so confirm the model before ordering a replacement line.

How Much Furling Line Do You Need?

The safest approach is to use the manufacturer's specified length where available. If the original line is still fitted and correctly routed, it can also provide a useful reference.

The required length needs to allow for:

• the line stored on the furling drum;
• the route from the drum through the stanchion blocks or fairleads;
• the distance back to the cockpit;
• sufficient working tail for secure handling and cleating.

Do not simply copy an old line if the deck routing has been changed or the previous line was obviously too short or excessively long.

Choosing the Rope Construction

A furling line needs to run cleanly around the drum and through the deck hardware while remaining comfortable to handle. Polyester braid is commonly used because it offers good durability, grip and resistance to UV exposure.

Strength should be considered, but braid count alone does not determine breaking load. Rope construction, fibre type, diameter and manufacturer specification all matter.

Check the Deck Routing

Before replacing the line, inspect every part of its route. Stiff or damaged blocks, poor alignment and excessive changes of direction can create much more friction than the rope itself.

Check:

• stanchion blocks and fairleads for free movement;
• sheaves for wear or damage;
• the line entering and leaving the furling drum cleanly;
• that the line does not rub against guard wires, fittings or the deck;
• the cockpit cleat or clutch used to secure the line.

If the Furler Is Difficult to Turn

A furling line should not be used simply to overpower a stiff or obstructed furling system. If excessive force is required, check the furler, halyard arrangement, bearings, swivels, foil alignment and deck routing before assuming that a stronger rope is the solution.

Always follow the operating guidance for the particular furling system. Excessive force can hide an underlying problem and may damage the furler, sail or standing rigging.

Seldén Furlex Replacement Furling Lines

If your yacht uses a Seldén Furlex system, we stock genuine replacement lines and a wide range of Furlex components for both current and earlier systems.

View Seldén Furlex spare parts and replacement furling lines.

Seldén Furlex and Harken MKIV Ocean Systems

If you are replacing the complete furling system rather than only the control line, see our Yacht Furling Systems range.

You can compare Seldén Furlex 104S, 204S, 304S and 404S systems or view the Harken MKIV Ocean range.

For more maintenance, identification and selection guidance, visit our Furling Systems Knowledge Centre.