In the Carbo blocks 75mm section you will find products from Harken's largest Carbo block series for heavier use: single block (H2660), block with hunsvot (H2661), double block (H2662) and double block with hunsvot (H2663), triple block (H2664 and H2665 with hunsvot), and triple blocks with locks (H2668, H2669 with hunsvot).
75 mm is the largest size in Harken's Carbo series and is designed for the main rigging of larger sailboats, such as mainsheet systems and genoa trim lines, where the loads are significantly higher than in smaller auxiliary functions.
The model with a lock (H2668/H2669) allows the rope to be locked directly to the internal mechanism of the block without a separate rope lock – this is particularly useful in winch systems where the rope needs to be held in place without constant hand holding, for example on a mainsheet in high winds.
The carbon fiber construction keeps the weight of the block reasonable despite its large size, which is especially important for blocks mounted at the top of the mast or at the end of the boom, where extra weight high up affects the stability of the boat more than below the center of gravity.
The triple block allows for the construction of a more complex pulley system with greater mechanical advantage – this is especially necessary for large sails, which would be too heavy to trim manually without a proper pulley ratio.
Before ordering, it is important to ensure the load capacity of the block in relation to the sail area of ??your boat and the expected wind conditions – an undersized block under heavy load is a safety risk that can lead to the block breaking at the worst possible moment.
Maintain the block regularly by rinsing it with fresh water and checking the bearings at the beginning and end of the season, as a larger block is often a more expensive investment, the service life of which should be extended with proper maintenance.
Larger blocks are also common in racing sailing, where the rope must run as smoothly as possible, even under heavy loads – high-quality bearings make a difference, especially in fast trim changes during racing.
If necessary, seek advice from a rigging expert if you are unsure about choosing the right size or type of block for your boat and sailing style.
Remember to also check the compatibility of the rope thickness with the selected block size before installation, so that the rope runs through the block without obstruction.
The stainless steel used in the larger block is highly resistant to saltwater corrosion for years without significant maintenance, making it a long-lasting investment for the entire life of the boat and saving you money in the long run.
A larger block is also suitable for rope systems where ropes of different thicknesses are often changed during the season according to different weather conditions.