Mounting Downriggers: Fiberglass Boat Installation Guide

how to install downriggers on a fiberglass boat

Installing downriggers on a fiberglass boat can be a challenging task. It is important to consider the type of downrigger, the size of the boat, and the placement of the downrigger mounts. Some people opt for clamp-on mounts, while others prefer to drill holes and use bolts, washers, and nuts for a more permanent solution. The weight of the downrigger and the force exerted on the mount should also be considered, with many recommending the use of backing plates or large washers to provide additional support.

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Using a thick L-bracket with pre-drilled holes

When installing downriggers on a fiberglass boat, one method you can use is to employ a thick L-bracket with pre-drilled holes. This method was shared by a user who installed downrigger mounts on their 14' Valco boat.

To achieve this, you will need to source a suitable L-bracket with pre-drilled holes. The user in this case procured theirs from Bi-Mart. Once you have the L-bracket, you will attach two bolts to the side of the bracket to secure it to the boat. This provides stabilization for the downrigger setup.

In addition to the L-bracket, the user also recommends attaching a square piece of marine plywood, measuring 8"x8", to the setup. This plywood can be fastened with bolts, washers, and nylock nuts, ensuring a secure installation.

It is important to consider the weight and force exerted on the downrigger mounts. Some users recommend the use of a full backing plate or, at a minimum, large OD washers to withstand the force. This is especially crucial when dealing with constant pressure while trolling.

When installing the downrigger mounts, it is advisable to position them at a slight angle instead of aligning them directly with the hull side. This angled placement ensures that the downrigger does not interfere with adjacent rod holders when swung into the stored position. This consideration allows for more efficient use of space and avoids potential tangles or obstructions.

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Clamping downriggers onto gunwales

There are a few different types of clamps that can be used for this purpose. One option is to use a Big Jon clamp-on rigger, which can be clamped directly onto the gunwale. These are typically used for smaller boats and can be found at hardware stores. Another option is to use a Penn downrigger mount, which fits into an existing gunnel rod holder, avoiding the need for drilling holes.

When clamping downriggers onto gunwales, it is important to consider the force that will be exerted on the mount. It is recommended to use a backing plate or large washers to distribute the force and prevent damage to the boat. The downrigger should also be mounted at an angle to the hull side to avoid interference with other equipment when in the stored position.

In addition to clamping, some downrigger setups may require additional stabilisation. This can be achieved by bolting the downrigger to the side of the boat or using a thick L-bracket with pre-drilled holes. It is important to consider the weight and force exerted on the downrigger when selecting the appropriate mounting method and hardware.

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Using a swivel mount

To install a swivel mount, you will need to purchase a swivel mount kit that is compatible with your boat and downrigger. The kit should include all the necessary hardware, such as bolts, washers, and nuts. Follow the instructions provided with the kit for the specific steps involved in installing the swivel mount.

Before beginning the installation, it is important to identify the location where you want to mount the downrigger. Consider the size and layout of your boat, and choose a location that will provide easy access to the downrigger while also allowing for optimal fishing performance.

When installing the swivel mount, pay close attention to the instructions for attaching the mount to the boat. Make sure to use the appropriate tools and hardware to ensure a secure and safe installation. It is recommended to use backing plates, large washers, and locking washers or nylon grip nuts for added strength and stability.

Additionally, consider the weight and force that the downrigger will exert on the mount. Ensure that the mount is installed at a slight angle to avoid interference with other components of the boat, such as rod holders. This will also help distribute the weight more effectively and reduce the risk of damage to the boat or the mount itself.

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Bolting downriggers onto a board

When bolting downriggers onto a board, it is important to consider the weight and force exerted on the mount. Here is a step-by-step guide:

  • Choose an appropriate board: Select a board made of sturdy material, such as marine plywood or aluminium, that can withstand the weight and force of the downrigger.
  • Prepare the board: Cut the board to the desired size, making sure it is large enough to provide a stable base for the downrigger. Drill holes in the board for bolts, washers, and nuts.
  • Gather the required hardware: Ensure you have the correct bolts, washers, and nuts to secure the downrigger to the board. Stainless steel or nylon bolts, washers, and nuts are recommended for corrosion resistance.
  • Attach the downrigger: Place the downrigger on the board and align the holes. Secure the downrigger to the board by inserting the bolts and tightening them with washers and nuts.
  • Stabilize the setup: Consider adding additional stabilization to the setup by using L-brackets or a backing plate. This will help distribute the force and weight more evenly, reducing the stress on the bolts.
  • Test and adjust: Once the downrigger is securely bolted to the board, test the setup by applying weight and ensuring it holds steady. Make any necessary adjustments to ensure a secure and stable mount.

It is important to note that the specific steps may vary depending on the type of downrigger and boat involved. Always refer to the manufacturer's instructions and take the necessary safety precautions when working with boats and fishing equipment.

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Using a full backing plate

When installing downrigger mounts on a fiberglass boat, it is recommended to use a full backing plate to withstand the constant pressure and force exerted on the mount when trolling. The backing plate provides additional support and helps distribute the load more evenly, reducing the risk of the mount failing or pulling out.

To install a full backing plate, start by measuring the size of the downrigger mount's base. The backing plate should be larger than the base to provide ample support. Cut the backing plate to size, considering the shape and angle of the mounting surface. Drill holes in the backing plate that align with the mount's base.

When preparing to install the downrigger, clean the mounting surface on the boat to ensure that it is free of any dirt, grease, or debris. This step is crucial for achieving a strong bond. Position the backing plate where the downrigger mount will be placed, using the drilled holes as a guide. Use stainless steel or nylon bolts, washers, and nuts to secure the backing plate to the boat. Apply a marine-grade sealant or adhesive to the bolts and between the backing plate and the boat to prevent water ingress and corrosion.

Finally, attach the downrigger mount to the backing plate using appropriate fasteners. Ensure that the mount is secure and check all fittings for tightness. By following these steps and using a full backing plate, you can securely install downriggers on your fiberglass boat, ensuring a safe and enjoyable fishing experience.

Frequently asked questions

It is recommended to use a full backing plate or large OD washers to deal with the force exerted on the mount. It is also important to angle the mount a few degrees off the side of the hull to avoid interference with the rod holder.

Some products that can be used include the Cannon Mounting Systems, Scotty Electric Downriggers, and the Big Jon Clamp.

It is important to consider the weight capacity and stability of the boat when choosing an installation method. Some users prefer removable or unboltable mounts for convenience and safety.

Some common issues include insufficient hardware stock, difficulty accessing mounting locations, and concerns about the strength of the installation.

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