The Harken Black Magic® Air Runner Block is a durable and lightweight component designed for high-performance sailing applications. It features a sheave with a high degree of rotational freedom, enhancing the efficiency of sail controls. The block is equipped with Torlon® roller bearings housed in a central cage, providing a high strength-to-weight ratio and reducing friction. Side running strips are incorporated to dampen vibrations, contributing to smoother operation. The design includes side openings and embedded axle pins within the cheek, creating a sleek aesthetic and preventing line snagging. The heads of the Black Magic® Air Runner Blocks are available with either parallel or perpendicular shackles, and the plates allow for the attachment of tensioners, straps, and other fittings. Installation is tool-free, facilitating quick and easy setup. Optional foam insert socks are available to protect the block, deck, and crew during operation.
- Lightweight construction with high-load Torlon® roller bearings for enhanced strength-to-weight ratio.
- Ideal for dynamic high-load sail controls, including mainsheets, runners, halyards, and spinnaker systems.
- Center cage design keeps Torlon® roller bearings separated and parallel, reducing friction.
- Sheaves with radiused edges protect modern high-tech lines.
- Recessed cotter key design prevents snagging on lifelines.
- Tool-free installation for quick and easy setup.
- Optional foam insert socks available for additional protection.
Technical Specifications:
- Sheave Diameter: Available in various sizes, including 45 mm, 57 mm, 75 mm, 100 mm, 125 mm, and 150 mm.
- Maximum Line Diameter: Varies by model; for example, the 45 mm model accommodates lines up to 10 mm (3/8 inch).
- Maximum Working Load (MWL): Ranges from approximately 1,653 lb (750 kg) for the 45 mm model to 15,000 lb (6,802 kg) for the 150 mm model.
- Breaking Load: Approximately 3,306 lb (1,500 kg) for the 45 mm model to 30,000 lb (13,605 kg) for the 150 mm model.
- Weight: Varies by model; for instance, the 45 mm model weighs 2.89 oz (82 g), while the 150 mm model weighs 56.72 oz (1,608 g).
- Length: Varies by model; for example, the 45 mm model has a length of 2-13/16 inches (71 mm), and the 150 mm model measures 10-13/16 inches (275 mm).
Materials:
- Sideplates and Sheaves: 6061-T6 aluminum with a deep-saturation Hard Lube-anodized finish for strength and durability.
- Bearings: Torlon® roller bearings housed in a center cage.
Compatibility Information:
The Black Magic® Air Runner Blocks are suitable for various sail controls, including mainsheets, runners, halyards, and spinnaker systems. They are designed for use on offshore boats and are compatible with modern high-tech lines.
