Choosing the right dock lines: An expert guide
When selecting dock lines, always opt for nylon rope. Other materials like polypropylene degrade faster in the sun, lack the necessary stretch, and have a lower breaking strength.
Types of dock lines
Three strand
- Abrasion-resistant
- More stretch
- Easier to splice
- Less expensive
Braided Nylon
- Stronger
- Easy on the hands
- Aesthetically pleasing
Double-Braided Nylon
- Strongest option
- Easy to manage
- Abrasion-resistant with controlled elongation
- Aesthetically pleasing
Features of dock lines
Most dock lines available at chandleries have a loop on one end for fastening to a cleat. Transient or temporary lines usually lack loops due to the varying cleat designs at different docks. Permanent lines often have loops on both ends. If you plan to splice your own lines, three-strand lines are easier to work with than braided ones.
They also come in various colours, but this is mostly for aesthetic purposes. Darker lines fade quicker, while lighter lines show dirt more easily.
Size, length, and quantity
The rule of thumb is to have 3.3mm of diameter for every 3 metres of the boat, with a minimum size of 10mm. For example:
- A 6-metre boat should use 10mm lines.
- A 13-metre boat should use 16mm lines.
You can choose larger lines for easier handling. For vessels over 21 metres, the formula adjusts to accommodate the width-to-strength ratio.
Reference Chart
Your specific requirements may vary, but the following chart can guide you:
- Length: They should be long enough to reach from your vessel cleat to the dock cleat. Transient lines for the stern or bow should be about two-thirds of the boat’s length. Spring lines should be equal to your boat’s length.
- Quantity: Ideally, have two stern lines, two bow lines, and two spring lines on board. At a minimum, carry one bow line, one stern line, and two spring lines. You might not always need to use two bow/stern lines, but having them on hand is essential for certain situations, such as heavy or stormy conditions.
Conclusion
Choosing the right dock lines is essential for your vessel’s safety and ease of handling. Opt for nylon rope in three-strand, braided, or double-braided varieties based on your needs. Ensure you have the correct size, length, and quantity to handle various docking scenarios effectively. Always be prepared and equipped with the appropriate dock lines for a smooth and secure boating experience.
