How to Pick an Anchor Rope Size, Type, Length and More

How to Pick an Anchor Rope Size, Type, Length and More

Every anchor needs to be attached to the boat some how. In this article we'll discuss everything anyone ever needed to know about anchor rode.

Video: Everything You Need to Know About Anchor Rode

The video below answers many of the topics addressed here although the article goes into more detail (so there is some reward for reading!).

What is anchor rode?

Rode simply refers to the line and/or chain that connects the anchor to your boat. (Believe it or not, rode is not a typo!)

Ideally, the rode for any anchor setup should consist of both chain and rope. The chain should be on the end with the anchor. Why use both chain and rope? First, it keeps the nylon rode from wearing away by rubbing on the bottom of the sea-floor as the boat swings. Second, because the chain is heavy, it holds the rode to the bottom so the pull on the anchor is horizontal, which reduces the chances of your anchor unsetting.

What type of rope should I use? Nylon, Polyester, or ...?

For most boaters, the best type of rope to use when anchoring is nylon. Nylon has many advantages for anchoring including:

  • It's elastic therefore offering good shock absorption
  • Light and flexible
  • Good strength
  • The most common anchor rope found in marine stores
  • It sinks

Nylon anchor rope is light, flexible, strong, and provides elasticity, which mitigates peak loads on your anchor and boat. Unfortunately, the very fact that nylon stretches means that it creates heat and will eventually break down and need to be replaced. However, you want a strong rope that will absorb the shock from waves and sink, not float. Nylon fits the bill of all of these things.

What's the difference between braided and twisted rope?

In our experience, for most recreational boaters, the difference between using twisted anchor rope or braided anchor rope comes down to preference and taste. Both make excellent choices for an anchor rope but there are some subtle differences between these two styles of rope.

Braided Rope

Braided

PROs

  • Less stiff and more flexible
  • Frequently stronger than twisted rope
  • Easier on the hands

CONs

  • Difficult to splice
  • Less stretch than twisted rope

Twisted Rope

Twisted

PROs

  • Fairly easy to splice
  • Generally less expensive
  • Has more stretch than braided

CONs

  • Has a tendency to kink or hockle
  • More stiff and less flexible

How much anchor rope do I need and what size?

One of the questions we get asked most often is, "How much anchor rope and/or chain do I need?" When selecting how much rope and chain you need there are a couple of rules of thumb to use.

Rules for calculating how much and how big of anchor rope to use

  1. You should have 8 feet of rope for every 1 foot of water you will be anchoring in
  2. Your rope should have 1/8" of rope diameter for every 9' of boat.

So this means a 28' boat would want at least a 3/8" or 1/2" diameter rope. Rope is one of those things, like anchors, where bigger normally is better.

As for a rope choice, Nylon is the clear favorite due to the fact it is elastic and relatively strong,

How much anchor chain do I need and what size?

Rules for choosing anchor chain length and size

Along with the rope, you should also have a smaller amount of chain between the rope and the anchor. This chain will keep your rope from rubbing against the seabed and also creates the optimal angle between your rode and the seabed. The general rule of thumb is that you want approximately 1' of chain for every 1' of boat. So a 30' boat would want 30' of chain. However, often certain constraints such as weight and locker room will not allow this ideal chain amount so in these situations you should have at least 10-15' of anchor chain for the reasons mentioned above. For boaters anchoring in extreme conditions and/or for extended periods of time, you will want about 1 foot of chain for every 6 feet of rope. The reason for the different requirements is that, in theory, by having 1 foot of chain for every 6 feet of rope, an optimal angle between the rode and the seabed will be achieved.

What type of chain do I need? (I am not using a windlass)

If you're not using an anchor windlass, your life is easy! Any chain that you can buy at a marine store that follows the size rules above should be adequate. Hardware store chain can also sometimes suffice but you should always be conscious of the breaking strength of it and ensure that it is galvanized. If you are not using a windlass, you can simply attach your rope to your anchor using a shackle in between (ideally your rope will have an eye and/or thimble spliced into one end to make attaching a shackle easy.

What type of chain do I need? (I am using a windlass)

Thinking about using a shackle with your windlass? Don't do it!

If you are using an anchor windlass then your choices are limited and you must use only the type and size of chain specified by the windlass manufacturer. Normally this type of chain will be G4 or BBB chain. Don't have your windlass manual? We have an article that lists the type and size of chain required by most popular sizes of windlass here. Windlass chain is a whole other topic and in fact, we have another article all about windlass chain here. If you are using a windlass, remember that you must splice your rope to your chain as a shackle going through your windlass gypsy will be bad news. (You can also hook the shackle around your windlass as well once it gets to that point but that's a pain!) You can purchase a prespliced rope and chain package or you can splice your own.

Published

Recent Posts

Best Options For Connecting Your Boat To WiFi Internet
Best Options For Connecting Your Boat To WiFi Internet
Whether you’re sailing around the world, exploring remote destinations, or hosting a few friends for a weekend getaway, there has never been a better time to connect your boat and guests with high-speed internet. Today’s digital era has made connectivity an essential part of work and play for most people, so we’ve assembled the best methods for accessing the internet right from your boat.
Best Boating and Fishing Mobile Apps of 2021
Best Boating and Fishing Mobile Apps of 2021
In today's modern world, there are a plethora of apps available to help us navigate our everyday lives. In recent years the boating world has benefited greatly from a variety of helpful apps that can help take your boating experience to the next level. Boaters today can download apps to help them log their trips, download nautical charts, reserve a slip, and even learn to tie essential boating knots. We have reviewed many of the apps on the market today and are sharing our best boating and fishing apps.
Choosing the Right Lighting For Your Dock
Choosing the Right Lighting For Your Dock
Dock lights not only help give your dock the right look but also go a long way to ensure you, your guests and your property remain safe and secure. We've assembled a list of the best dock lighting options to help you find the perfect solution for your dock.
Best Anchor Rode Accessories to Make Anchoring Easier
Best Anchor Rode Accessories to Make Anchoring Easier
Anchoring with inadequate ground tackle is not only unsafe but can also make setting anchor a painstaking and arduous process. Luckily there are a number of solutions available to help simplify the process and to help keep you and your craft safe. The three main components of your anchor rode are the anchor line, chain, and anchor but additional accessories can be added to customize your system for your specific needs to help make dropping anchor a snap.
2020 Holiday Gift Guide - 15 Best Boating Gift Ideas
2020 Holiday Gift Guide - 15 Best Boating Gift Ideas
It's that time of the year again! Are you having troubles finding that perfect gift for your boating enthusiast? Never fear, we have assembled 15 of this years coolest and best gift ideas that will put a smile on any boaters face.
Best DIY Upgrades to Add Comfort and Value to Your Boat
Best DIY Upgrades to Add Comfort and Value to Your Boat
As the weather begins to cool off and the boating season starts to wind down, now is the perfect time to start planning a few DIY upgrades you can perform to improve the comfort factor and value of your boat for seasons to come.
Outboard Boat Engine Won't Start: Common Issues and Fixes
Outboard Boat Engine Won't Start: Common Issues and Fixes
Oh no! You go to crank your outboard only to realize it won't start. Don't fret - by following these common outboard problems and fixes you'll be able to identify and resolve the issue in no time.
How to Clean Boat Fenders
How to Clean Boat Fenders
Dirty fenders aren't just hard on the eyes, they can also leave ugly streaks and scratches down the hull of your boat that are hard to remove. Dirt, mildew, and sediment can build up on a fender's surface from years of use and abuse. Here are some tried and true methods for keeping your fenders looking good and operating properly for years to come.
Boating With Dogs: Essentials and Creature Comforts
Boating With Dogs: Essentials and Creature Comforts
Dogs can make great first mates whether you're setting sail for the long voyage or taking the boat out for some quick fun in the sun on your favorite lake. Dogs and boats can be a fun combo, but there are extra precautions you should take to ensure Fido remains safe and secure.
When to Replace Your Anchor Rode
When to Replace Your Anchor Rode
How often do you change your anchor rode? This is a question we seldom hear, but in reality, is a question that boat owners should ask themselves more often. If your anchor rode components operate smoothly and look good at a glance, this is probably a question you wouldn't even think to ask. However, failing to keep a close eye on your current anchor rode setup could lead to costly repairs down the road.