B744VL Raymarine bronze through-hull triducer long cable 13.8m

A triducer is a type of marine transducer that combines three essential functions into a single unit. The Raymarine B744VL measures depth below the keel, boat speed through the water, and water temperature. It provides these data simultaneously to compatible navigation instruments.

The Raymarine B744VL triducer operates on two frequencies: 50 kHz and 200 kHz. The 50 kHz frequency is ideal for deep-water depth detection and bottom penetration, while the 200 kHz frequency provides better resolution and accuracy for shallower depths and target detection.

The B744VL triducer is made of bronze for its durability and corrosion resistance in a marine environment. Bronze is particularly well-suited to fiberglass and wooden hulls, providing excellent longevity and reliability in saltwater.

"Through-hull" means the triducer is installed by drilling a hole through the boat's hull, with the sensor's active part protruding below the hull and the connection inside. This installation method ensures direct and precise data readings, without interference from the hull, unlike transom-mounted or internally bonded transducers.

The Raymarine B744VL triducer comes with a 13.8-metre cable. This generous length provides significant flexibility for installation, allowing you to route the cable to Raymarine instruments or multifunction displays without needing additional extensions in most configurations.

The "L" in B744VL indicates that this model is equipped with a long stem. A long stem is particularly useful for thick hulls or installations requiring a larger fairing block, ensuring the transducer surface is properly exposed to the water flow beneath the hull.

Yes, the B744VL triducer is equipped with a self-sealing valve. This valve allows the transducer insert to be removed from inside the hull for cleaning or maintenance without having to take the boat out of the water.

The advantages of a through-hull triducer include increased accuracy for depth and speed, as it is less prone to turbulence and interference. It also delivers better hydrodynamic performance, reducing drag and ensuring reliable detection even at high speeds or in rough sea conditions. In contrast, transom-mount transducers may lose bottom or speed due to cavitation.

Yes, thanks to its through-hull design and the option to use a fairing block, the B744VL triducer is engineered to deliver reliable performance even at high speeds and in rough sea conditions. The through-hull installation minimizes turbulence and ensures a steady water flow over the sensor.

The B744VL triducer is designed to provide highly accurate water speed and temperature measurements. Speed is measured using a paddlewheel that rotates with the water flow, while temperature is measured by an integrated thermistor, delivering reliable data for navigation and fishing.

The B744VL bronze triducer is compatible with fiberglass and wood hulls. It is not recommended for aluminum or steel hulls due to the risk of galvanic corrosion between the bronze and the hull metal. For these materials, stainless steel or plastic transducers are typically required.

The Raymarine B744VL triducer is designed to be compatible with Raymarine multifunction displays (MFD), Digital Sounder Modules (DSM), or CHIRP sounder modules (CP), as well as certain dedicated Raymarine instruments. It outputs analog data that is then processed by these units. It is always recommended to verify specific compatibility with your Raymarine device model.

The Raymarine B744VL triducer is specifically designed with a connector and electrical specifications for Raymarine systems. Use with other brands is generally not possible without a specific adapter or modification, which is not recommended.

The B744VL triducer is an analog transducer that outputs raw depth, speed, and temperature data. It does not connect directly to an NMEA 2000 network. To integrate its data into an NMEA 2000 network, it would need to be connected to a Raymarine device compatible with NMEA 2000 (such as an MFD or a fishfinder module) that can convert and transmit this information over the network.

Installing the B744VL triducer requires drilling a hole of a specific diameter in the hull. For this model, the drilling diameter is typically 51 mm (2 inches). It is essential to consult the installation manual provided with the product for exact dimensions and detailed instructions before drilling.

The fairing block is a shaped part installed around the triducer’s shaft on the hull. Its role is to compensate for the hull’s deadrise angle and provide a flat, hydrodynamic surface for the triducer. This ensures the sensor is correctly oriented downward and minimizes turbulence and drag, improving measurement accuracy—especially at high speeds.

The ideal position for installing a through-hull triducer is generally in the forward section of the boat, away from turbulence generated by the propeller, keel, or other appendages. It should be placed in an area where the water flow is most laminar and free of air bubbles to ensure accurate depth and speed readings. It is recommended to consult the installation manual and, if possible, a professional.

Yes, using an appropriate marine sealing product is absolutely essential when installing a through-hull triducer. It is applied generously around the transducer barrel and on the contact surfaces with the hull to ensure a perfect seal and prevent any water infiltration. A polyurethane sealant or a similar product is generally recommended.

Yes, due to its design with a self-sealing valve, you can remove the insert from the B744VL triducer from inside the hull to clean or inspect it without taking the boat out of the water. The valve automatically closes to prevent water from entering during this operation.

The Raymarine B744VL is a long-stalk triducer designed to be used with a fairing block to optimize its performance. Typically, this type of transducer is supplied with a fairing block matched to its shape to facilitate correct and hydrodynamic installation. It is advisable to check the exact contents of the packaging.