Lewmar has developed a rope clutch technology utilizing a variable geometry handle and a unique “Domino” grip pattern designed to minimize rope fray. This non-cam clutch system employs a series of hinged, in-line, and parallel rings that are tilted by a single connecting lever. The tilting action forces the rope to snake through the rings, generating friction to secure the line. Releasing the handle allows the rings to return to their original configuration, straightening the line for controlled easing. The system has undergone independent testing and has received recognition for its innovative design.
Operational Principles of the Lewmar DC Clutch
The Lewmar DC rope clutch differs significantly from traditional cam-based clutches. Historically, rope clutches relied on teeth on a cam to grip the rope. This method often resulted in line abrasion. Lewmar’s approach utilizes a “Domino” mechanism that flexes the line, providing a secure hold while reducing wear. The clutch operates by tilting a series of rings, causing the rope to snake through them and create friction. This friction is the primary means of securing the line. When released, the rings return to their original position, allowing the rope to be eased. The design emphasizes controlled release, even under full holding load, achieved through the combination of the handle pull-back and the patented clutch and release mechanism.
Clutch Sizing and Rope Compatibility
Selecting the appropriate clutch size is crucial for optimal performance. It is recommended to choose a clutch with an upper rope range that closely matches the diameter of the rope being used. This ensures maximum deflection as the Domino mechanism flexes the line, maximizing holding power. The Lewmar DC clutch is capable of handling rope sizes ranging from 6mm (1/4 inch) to 14mm (9/16 inch). Lewmar offers two models: the DC1, designed for low-load applications, and the DC2, intended for high-load applications.
Installation Considerations
Information regarding specific installation procedures is limited within the provided documentation. However, a user forum post indicates experience installing Lewmar D1 clutches on a cabin top. The user referenced a previous installation on a C-22 model, utilizing 3.5-inch long, 6mm stainless steel bolts for mounting. The post specifically requests confirmation of this bolt length for newer designs. The documentation does not provide specific installation instructions or torque specifications.
Lewmar Product Documentation Overview
The provided documentation includes references to various Lewmar product manuals, covering a range of boating equipment. These include installation manuals for drive systems (models 893000563, 89300057, 89300058, 89300059), product manuals for autopilots (models 8000, Gen 2 S2000, Gen 2 S900), flush hatch fittings (FLUSH 2G, FLUSH 3G), and anchoring systems (LFX). Additionally, manuals are available for winches (models 111, 111/3EST, 111EST, 18000430, 18000431, 40, 40EST, 44, 44EST, 48), safety equipment (OVERSIDE WORK RAIL SYSTEM), and cash counters (AutoAnchor 560 V2). Documentation also exists for fishing equipment (CPX, CPX3, Fish 1000, Fish 700, Pro Fish Pb, Pro Series). The documentation also lists manuals for V700, S2000, and S900 models.
Features of the Lewmar DC Clutch
The Lewmar DC rope clutch incorporates several key features:
- Domino Cluster: A greater holding surface area designed to secure the line under load without causing fraying.
- Controlled Release: A patented clutch and release mechanism, combined with a pull-back handle, facilitates controlled release even when the clutch is under a full holding load.
- Solid Linkage: A solid link connects the handle to the Domino Cluster, ensuring reliable operation.
- Rope Size Versatility: The clutch accommodates rope sizes from 6mm (1/4 inch) to 14mm (9/16 inch).
- Model Options: Availability in two models, DC1 (low load) and DC2 (high load), to suit different application requirements.
Available Documentation and Manuals
Lewmar provides a comprehensive range of documentation for its products, accessible through their website and manual repositories. The documentation includes installation manuals, product manuals, assembly instructions, owner’s manuals, and servicing manuals. These resources cover a wide array of boating equipment, including autopilots, winches, safety equipment, and anchoring systems. The documentation is categorized by product type and model number, facilitating easy access to relevant information. The documentation also includes instructions for flush hatch fitting and adjustment.
Safety Equipment Documentation
Lewmar also provides documentation for safety equipment, specifically the OVERSIDE WORK RAIL SYSTEM, including installation, use, and servicing manuals. Documentation for switches (models 68001026, 68001027, 68001030, 68001031) is also available, consisting of instructions.
Winch Documentation
A substantial amount of documentation is available for Lewmar winches, covering various models (111, 111/3EST, 111EST, 18000430, 18000431, 40, 40EST, 44, 44EST, 48). This documentation includes manuals detailing installation, operation, and servicing procedures.
Conclusion
The Lewmar DC rope clutch represents an innovative approach to rope handling, prioritizing reduced line wear through its unique Domino mechanism. The clutch’s ability to flex the line, rather than grip it with teeth, minimizes abrasion and provides a secure hold. Proper clutch sizing, based on rope diameter, is essential for optimal performance. While detailed installation instructions are not provided in the available documentation, user reports suggest a 3.5-inch bolt length may be suitable for certain installations. Lewmar offers a wide range of supporting documentation for its products, including manuals for autopilots, winches, safety equipment, and anchoring systems.