Fenders protect your boat from scratches, dents, and damage while mooring. Yet, they're often misplaced: too high, too low, or in the wrong place. Correctly adjusting fenders is essential for preventing hull damage, whether you're sailing a sloop, motorboat, or sailboat. A properly positioned fender absorbs the pressure between the boat and the dock, not the railing or edge of the hull.
In this article, we explain how to adjust fenders to the correct height and position, tailored to different boat types. This way, you'll know exactly what to look for and prevent unnecessary damage when mooring.
1. Basic Principles of Fender Adjustment
A fender should always be placed where the boat can make contact with the dock, piling, or another boat. This is usually the widest part of the hull. The correct height is achieved when the fender hangs precisely between the hull and the dock and can move freely.
It's important that the fender doesn't rest on the edge of the boat, but hangs along the side. Use sturdy lines to prevent the fender from shifting in waves or currents. See our blog post "Different Types of Fenders" for the right fenders.
2. Adjusting fenders on a sloop
Sloops often have a low freeboard and a rounded hull. Therefore, fenders should be set relatively low. Hang them so that the center of the fender is level with the edge of the dock.
It's best to place several smaller fenders along the sides instead of one large one. This distributes the pressure better and keeps the boat stable.
3. Adjusting fenders on a motorboat
Motorboats usually have higher hulls and more weight. Therefore, it's important to mount fenders a little higher than on a sloop. Make sure the fenders protect the hull, not just the superstructure.
For wide motorboats it is wise to place additional fenders at the widest point.
4. Adjusting fenders on a sailboat
Sailboats often have a narrow waterline and a protruding hull. This requires extra attention to the position of the fenders. Angle them slightly outward so they make good contact with the dock.
For longer moorings or boxes, it is wise to use additional fenders at both the front and rear, especially in changing wind directions.
5. Common mistakes with fenders
One of the most common mistakes is hanging fenders too high. This prevents them from absorbing contact and can still damage the hull. Using too few fenders or hanging them all from a single point is also common.
In addition, fenders are sometimes attached with lines that are too thin or worn. Always use strong lines suitable for maritime use. The blog "Lines & Ropes" explains how to adjust this correctly.
Frequently asked questions about fender adjustment
How high should a fender hang?
A fender should be hung so that it is exactly between the hull and the jetty, usually at the widest part of the boat.
How many fenders do I need?
That depends on the length of your boat. A guideline is: at least three fenders per side for smaller boats and more for longer or heavier boats.
Can I use the same fenders for every jetty?
Not always. With high scaffolding or poles, it may be necessary to adjust the fenders or use additional fenders.