Selecting the Correct Sized Anchor for Your Boat
Choosing the right anchor is essential for keeping your boat secure, whether you’re relaxing for lunch in a sheltered bay or waiting out a change in the weather. While anchor sizing charts offer a helpful starting point, it’s important to remember that these are general guidelines. Factors such as boat design, weight distribution, windage, seabed type, and where you typically anchor can all influence what size and style you ultimately need.
Below is a simple overview of two common anchor types, along with their typical applications and suggested boat sizes.
When to use a Sand Anchor
Sand anchors are a classic choice for smaller boats and tenders operating in sandy or muddy bottoms. Their lightweight design and straightforward shape make them quick to set and easy to retrieve, perfect for casual day trips, beach landings, and sheltered anchorages.
Example Specification:
Weight: 1.8kg
Length Overall: 440mm
Suitable for boats up to: 10'
These compact anchors provide a reliable hold for small vessels and are ideal as a primary anchor for dinghies or as a secondary/stern anchor on larger boats.
When to use a Plough Anchor
Plough-style anchors are known for their ability to dig in deeply and reset themselves if the boat swings, making them a popular all-rounder for trailer boats and small cruisers. They perform well in a variety of seabeds, including sand, mud, and gravel.
Example Specification:
Weight: 10 lbs
Suitable for boats up to: 21'
Their dependable holding power and versatility make them a smart choice for boaters who might encounter mixed bottom conditions or stay overnight on the pick.
When to use a Plough-Style Roll-bar Anchor
Plough-style rollbar anchors are a popular modern evolution of the traditional plough design, offering excellent performance across a wide range of seabeds. The defining feature is the rollbar, which helps the anchor land and set in the correct orientation every time. This makes them especially reliable for boaters who anchor frequently or in varied bottom conditions.
These anchors excel in sand, mud, gravel, and softer seabeds, using their weighted tip and wide fluke profile to dig in quickly. The rollbar ensures the anchor self-rights on landing, promoting fast setting and dependable holding power — even if your boat swings with tide or wind changes.
Example Specification:
Weight: 10–15 lbs (varies by model)
Suitable for boats up to: 18'–30' (general guidance only)
Rollbar plough anchors are well-regarded for their ability to reset if the vessel swings, making them a strong choice for overnight stays or exposed anchorages. Their robust construction and consistent performance provide peace of mind, especially for trailer boats, small cruisers, and those who want a high-holding anchor without moving into heavier or more specialised designs.
Final Tips
- Always consider going up a size if your boat has a high cabin, a heavy fit-out, or if you regularly anchor in exposed locations.
- Pairing your anchor with the correct chain and rope setup is just as important as the anchor itself.
- Keep in mind that local conditions vary, when in doubt, opt for a bit of extra holding power.
- With the right anchor on board, you’ll enjoy safer, more confident boating—whether you’re casting a line, grabbing lunch, or spending the night under the stars.