Precision-Engineered GRP Tube for Superior Bow Thruster Performance

This specialized GRP tube measures 250mm in diameter, 7.5mm wall thickness, and 1000mm in length, designed exclusively for Lewmar's 250TT series bow thrusters. Crafted from high-quality glass-reinforced plastic, it forms the essential tunnel housing that directs thrust efficiently, ensuring smooth sideways maneuvering for mid-sized vessels.

Boat owners upgrading or repairing their propulsion systems appreciate its robust construction, which withstands the harsh marine environment without compromising structural integrity. Whether you're retrofitting an older installation or building a custom setup, this tube delivers the reliability Lewmar is renowned for in the boating community.

Why Choose GRP for Your Bow Thruster Tunnel?

GRP, or glass-reinforced plastic, stands out in marine applications for its exceptional properties:

• Corrosion Resistance: Unlike metal alternatives, GRP won't rust or degrade from constant exposure to saltwater, extending the lifespan of your thruster system.
• Lightweight Durability: At just the right balance of strength and low weight, it reduces overall boat load without sacrificing rigidity.
• Smooth Interior Surface: Minimizes friction for propellers, optimizing thrust efficiency and reducing wear on moving parts.
• Easy Installation: Pre-sized for quick fitment, with clean edges that simplify bonding or mounting in fiberglass hulls.

These attributes make it a go-to choice for professional installers and DIY enthusiasts tackling bow thruster projects on yachts and motorboats up to 50 feet.

Perfect Compatibility with 250TT Series

Tailored specifically for the Lewmar 250TT bow thruster lineup, this tube ensures seamless integration. It accommodates the thruster unit's dimensions precisely, preventing alignment issues that can lead to vibration or reduced performance.

Common applications include sailboats, powerboats, and workboats where precise docking is critical. Verify your hull thickness and thruster model during planning—most installations suit hulls from 40mm to 120mm thick, but always measure twice for a flawless fit.

Installation Insights for Optimal Results

Installing a bow thruster tube requires careful preparation, but this GRP component simplifies the process:

1. Site Preparation: Mark the tunnel path through the bow, ensuring at least 300mm clearance from the keel for unobstructed water flow.
2. Cutting and Fitting: Use a fine-tooth saw for clean cuts; the 7.5mm wall provides ample strength for trimming if needed.
3. Sealing and Bonding: Apply marine-grade epoxy or polyester resin for a watertight seal, reinforcing with fiberglass cloth around joints.
4. Thruster Alignment: Level the unit within the tube using shims, then secure with provided hardware for vibration-free operation.

Pro tip: Test-fit the tube before final bonding to account for any hull curvature. In cooler climates, warm the resin for better adhesion.

Long-Term Maintenance for Peak Efficiency

To keep your bow thruster performing like new:

• Inspect the tube annually for cracks or delamination, especially after grounding incidents.
• Flush the tunnel with fresh water post-saltwater use to prevent marine growth.
• Avoid impacts from debris; the GRP's impact resistance is high, but proactive care pays off.

With proper upkeep, this tube supports years of trouble-free service, minimizing downtime during peak boating seasons.

Frequently Asked Questions