Blocks & buoys Rake

Base your selection primarily on the working load (SWL)—it is crucial for actual operation. The breaking load is the ultimate safety value, but it does not replace proper sizing. Select the pulley size, bolt/shackle strength, and pulley type to match the rope diameter, shearing angle, and position (e.g., mainsheet, downhaul, traveller). For highly dynamic loads (gusts, waves, forced jibes), a safety margin is advisable.

Ball bearings offer very smooth operation under low to medium loads and are ideal for trim lines, fine-tuning, and quick operation. For high continuous loads, a high-load design or a robust bearing (depending on the series) may be the better choice. The key factor is: smooth operation must work under your actual load—not just “at the pier.”

Composite is lightweight, corrosion-resistant, and popular in the performance sector. Stainless steel (e.g., A4/316) is very robust and seawater-resistant, but adds weight. Aluminum is lightweight and rigid, but requires special attention regarding galvanic coupling (contact with stainless steel/carbon, humid environments). Use suitable insulation/separator layers and ensure you use appropriate fasteners.

It is important to use the right shackles/straps, play-free stops, and clean line routing (no sideways pulley travel, no sharp deflection angles). Avoid impact loads caused by overly long attachment points and, if necessary, secure freely swinging blocks with a lightweight keeper/retainer. Also ensure that the rope matches the sheave diameter—rope that is too thick or too stiff increases friction and wear.

In high-load areas, always use backing plates or sufficiently large washers so that forces are properly transferred to the deck/bulkhead. Drill holes cleanly, deburr edges, seal core material if necessary (sandwich deck), and use a suitable sealant. Select appropriate fasteners (A4/316) and ensure correct length and torque—this will help prevent leaks and material damage.

Inspect bolts/split pins, shackles, bearing movement, washer flanges, and attachment points. Rinse off salt and check for cracks, deformations, and signs of corrosion. Bearings should rotate freely; sand/salt can significantly impair smooth operation. For components in heavily loaded systems (mainsheet/traveler/downhaul), regular visual and functional checks are particularly important.