Helena Frye
When it comes to mounting a side-imaging transducer on a fiberglass boat, there are several options and techniques to consider. The choice of mounting method depends on factors such as boat type, performance requirements, and installation complexity. One popular method is the transom-mount, which is suitable for most boats, including fiberglass vessels. This method involves ensuring the transducer is parallel to the hull bottom, with fine-tuning adjustments for optimal performance. Another option is the trolling motor mount, which requires adapters to attach the transom mount transducer to the trolling motor. For fiberglass boats, through-hull transducers are also an effective choice, offering clean water and reduced interference. However, they are generally more expensive and challenging to install, requiring holes in the hull. Some boat owners prefer to use mounting boards or aluminium mounts, which provide flexibility in transducer placement and reduce the need for multiple holes in the transom.
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What You'll Learn
Transom-mount transducer installation tips
Transom-mount transducers are a good choice for most trailerable boats. They are affordable, easy to install, and perform well at less-than-planing speeds. Here are some tips to help you install a transom-mount transducer:
Positioning the Transducer
Most installation manuals recommend positioning the transducer so that its bottom surface is parallel with the hull bottom and either flush with the hull bottom or 1/8" below. This can be achieved by holding a long straight edge against the bottom of your boat and matching the fore-aft angle of the transducer. Use a horizontal guideline on your transom, such as the bottom edge of a jackplate, and a framing square to ensure your transducer is level side-to-side.
Fine-tuning
Getting a transom-mount transducer to work optimally may require some fine-tuning. This can often be done without drilling new holes, but using a mounting plate is recommended to minimise drilling into your transom. Screw-on and stick-on plates are commercially available, or you can make your own from materials like Starboard or expanded PVC.
Cable Routing
When routing the transducer cable, avoid placing it close to other cables and wiring to prevent interference. Use cable clamps to secure the cable along its length. If you need to drill through the transom to route the cable, use the supplied cable cap and sealant to prevent water intrusion.
Performance Considerations
Lowering the "tail" end of the transducer a few degrees can improve performance at speed. However, be cautious as lowering it too much will create drag and increase the risk of strikes from floating debris. Additionally, ensure the transducer is immersed in water free of air bubbles to prevent sonar interference.
Single-drive and Twin-drive Boats
For single-drive boats, Airmar recommends locating the P66 on the starboard side, where propeller blades are usually moving downward. It should be close to the centerline but at least 3 inches outside the swing radius of the prop blades. For twin-drive boats, mount the transducer between the drives.
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Trolling motor mount as an alternative
Trolling motor mount is one of the three mounting options for a side-imaging transducer on a fibreglass boat. The other two options are transom-mount and plastic thru-hull transducer. The trolling motor mount option requires you to purchase adapters separately to attach the transom mount transducer to the trolling motor.
The trolling motor mount is a good option for side imaging as it helps identify rockpiles, rock ridges, brushpiles, and logs. It can also help locate missed piles without needing to circle over the area. However, it is important to note that the images produced while fishing may not be very clear.
To get good images at slow speeds, you need to match your screen scroll speed with your boat speed. Setting the scroll speed to 'Auto' can help with this. Additionally, the orientation of the transducer is crucial. The transducer should move through the water in the same direction it is pointing. Any skewed motion, such as from a side wind or current, can distort the side and down images, especially when turning the trolling motor.
When installing a trolling motor mount, it is important to ensure that the bottom of the transducer is parallel with the bottom of the hull. This can be achieved by holding a long straight edge against the bottom of the boat and matching the fore-aft angle of the transducer. Lowering the "tail" end of the transducer a few degrees can improve performance at speed, but it is important not to lower it too much as it can create drag and put the transducer at risk of strikes from floating debris.
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Benefits of through-hull transducers
For fiberglass boats, through-hull transducers offer several advantages over other types of transducers. Firstly, they are located in clean water, well forward of the engines, reducing the risk of interference from other electronics and cables. This clean and unobstructed water flow can also improve performance at speed. The location of through-hull transducers makes it easier to run cables separately, further reducing the possibility of interference. This is particularly beneficial for center consoles, where there may be limited wiring options.
Another benefit of through-hull transducers is their accuracy, even at higher speeds. Unlike in-hull transducers, which send sound waves through the hull material and may experience interference or distortion, through-hull transducers are mounted directly on the exterior of the hull with the sensing element extending into the water. This direct contact with the water column provides more accurate depth and fish-finding information, even when the boat is moving quickly.
Through-hull transducers also offer a streamlined and aesthetically pleasing installation. They are installed by drilling a hole through the hull of the boat, which securely mounts the transducer to the hull. While this requires a more complex installation process and may not be suitable for DIYers, the result is a robust and reliable transducer setup.
Despite the drawbacks, such as increased cost and vulnerability to damage from floating debris or trailer bunks, through-hull transducers are a popular choice for fiberglass boats. They provide optimal performance, accuracy, and clean data readings, making them a preferred option for boaters seeking efficient and effective navigation and fish-finding capabilities.
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Drawbacks of through-hull transducers
When it comes to choosing a transducer for your fiberglass boat, you may be considering a through-hull transducer. While this type of transducer offers some advantages, there are also several drawbacks to be aware of before making your decision.
One significant drawback of through-hull transducers is the installation process. Unlike in-hull transducers, which are mounted on the inner surface of the hull using adhesive, through-hull transducers require drilling a hole in the hull of your boat. This can be a major inconvenience for boat owners who want to avoid altering their vessel's structure. Additionally, if the through-hull transducer is not installed correctly, it may not function properly, and you may need to haul your boat out of the water to address any issues.
Another disadvantage of through-hull transducers is the potential impact on hull performance. Any protrusion from the hull, such as a through-hull fitting, can increase the thickness of the turbulent layer downstream, affecting the overall hydrodynamic efficiency of your boat. This is an important consideration, especially if you prioritize speed and smooth sailing.
Through-hull transducers may also pose challenges in terms of compatibility and replacement. For example, if you have a specific model of through-hull transducer that fails or becomes outdated, you might need to grind off the old fairing and install a completely new unit, which can be costly and time-consuming.
Lastly, through-hull transducers can be more expensive than in-hull options. While a basic through-hull transducer can be purchased for a few hundred dollars, high-performance models can cost upwards of $1,000. Therefore, it is essential to carefully consider your boating needs and budget before selecting a through-hull transducer.
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$130.23 $149.99
Using sealant to prevent water ingress
When mounting a side-imaging transducer on a fibreglass boat, it is important to consider the use of sealants to prevent water ingress. While fibreglass boats are known for their durability, the use of an appropriate sealant can provide an extra layer of protection against water intrusion, ensuring a dry and comfortable ride.
Marine sealants are designed to withstand the harsh conditions of the marine environment, including exposure to water, salt, and UV rays. They create a reliable seal that prevents water from entering the boat through gaps or joints. Sealants can also help block sound and heat transmission and prevent the accumulation of dirt and debris, contributing to a more pleasant boating experience.
When selecting a sealant for your fibreglass boat, consider the advantages of adhesive sealants, which not only seal fittings but also mechanically bond to certain materials. This provides a stronger hold and can be particularly useful for areas below the waterline. Silicone, for example, is a popular choice for boat maintenance due to its UV resistance, heat resistance, and insulating properties. However, keep in mind that silicone has weak adhesive strength, so it may be impractical for certain applications.
For through-hull transducers, which require a hole in the hull bottom, using a suitable marine sealant is essential to creating a watertight seal around the transducer mounting. This will prevent water ingress and protect the integrity of your boat's hull. It is also important to consider the type of transducer being installed. Through-hull transducers, for example, are located in clean water, well forward of the engines, making it easier to run cables separately and avoid interference from other electronics.
By following the manufacturer's instructions and selecting a high-quality marine sealant, you can effectively prevent water ingress and maintain the longevity of your fibreglass boat, ensuring a safe and enjoyable boating experience. Remember to allow adequate curing time for the sealant before exposing your boat to water, as this will ensure a strong and durable seal.
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Frequently asked questions
There are three mounting options for a side-imaging transducer: transom-mount, trolling motor mount, and plastic thru-hull transducer. For a fiberglass boat, a through-hull transducer is likely the best option for performance, especially at speed. However, it is more expensive and requires a hole in the hull bottom, which is not suitable for DIYers. A transom-mounted transducer is a more popular choice for trailerable boats.
The first step is to ensure the bottom of the transducer is parallel with the hull bottom and 1/8" below it. Lowering the "tail" end of the transducer a few degrees can improve performance. The next step is to ensure the transducer is level side-to-side by using a horizontal guideline on the transom. It is also important to avoid routing transducer cables close to other cables and wiring to prevent interference.
Through-hull transducers are generally more expensive and are not suitable for DIY installation. They require drilling a hole in the hull bottom, which can be a concern for water leakage. Additionally, models extending below the hull bottom are more susceptible to damage from floating debris and trailer bunks.
It is recommended to use a mounting board or aluminium mount to fasten the transducer to the boat. Drilling pilot holes and filling them with marine sealant can help secure the mount. It is also important to consider the location of the transducer to avoid interference from other cables and electronics.
