Upgrade your boat's navigation with the Raymarine T911 long-body thru-hull speed transducer, a reliable choice for capturing precise speed-through-water data even in demanding marine conditions. Designed for vessels with thicker hulls, this retractable model stands out by combining speed measurement, water temperature sensing, and easy maintenance features into one robust package.

Why Choose the Long-Body Design for Your Vessel

The T911's extended body accommodates hull thicknesses up to 2.125 inches (55mm), making it ideal for larger displacement hulls or those with reinforced bottoms where shorter transducers fall short. Unlike flush-mount options, its thru-hull installation ensures minimal drag and accurate readings unaffected by prop wash or paddlewheel interference. Boaters often praise its consistency during long passages, delivering speed data that syncs seamlessly with chartplotters and multifunction displays.

Key Performance Advantages

• Retractable Piston Mechanism: Pull it up effortlessly for hull cleaning without hauling the boat, minimizing downtime during cruises.
• Integrated Flap Valve: Seals against water intrusion the moment you retract the sensor, a game-changer for safety in rough seas.
• Built-in Temperature Sensor: Tracks real-time water temps to optimize engine performance, fishing spots, or hypothermia risks.
• Compact 2-Inch Diameter: Fits standard cutouts while providing a low-profile bronze housing that resists corrosion in saltwater environments.
• 6-Meter Cable Length: Offers flexible routing to your Raymarine instruments, reducing signal noise from long runs.

Installation Insights for Optimal Results

Mounting a thru-hull transducer like the T911 requires careful planning to avoid turbulence. Position it forward of the prop and keel, ideally amidships at the boat's widest beam, angled slightly downward (about 10-15 degrees) for best water flow. The included blanking plug lets you seal the hole during off-season storage. Pair it with marine sealant and fairing blocks to align perfectly with your hull's deadrise angle—users report up to 20% better accuracy post-install tweaks.

Real-World Reliability and Compatibility

Engineered for Raymarine's legacy T100 and MN100 speed systems, the T911 integrates smoothly with modern NMEA 0183 networks too. It's a staple for sailboats, power yachts, and fishing charters needing dependable log data without the fuss of in-hull alternatives. In choppy waters or with biofouling-prone areas, the flap valve and retractable design keep performance steady, often outlasting budget sensors by years.

Maintenance Tips to Extend Service Life

Regular care keeps the T911 spinning smoothly. Retract monthly for a gentle freshwater rinse and impeller inspection—common culprits like barnacles or algae are no match for this setup. Winterize by filling the housing with antifreeze, and always use the blanking plug to prevent freezing damage. Proactive owners swear by these habits for decade-long reliability.