Product Details
55 Series Orbitblock™ Ratchet Sheave Triple Block with Becket, Cam Cleat & Swivel Shackle, Auto for 3/8" D Lines by Ronstan®. Automatic ratchet block. Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.
Specifications
| Breaking Load: 3300 lb |
| Maximum Line Diameter: 10 mm (3/8") |
| Maximum Working Load: 1650 lb |
| Pin Diameter: 5 mm (3/16") |
| Sheave Diameter: 2-5/32" |
| Weight: 13.8 lb |
Features
- Up to 20:1 holding power
- Smooth easing of sheets
- High performance cleating
- Swivel shackle head for unlimited block rotation
- Stainless steel shackle head for ultimate durability and compatibility with harsh fixing points
- Ultra low profile integrated beckets
Applications:
Mainsheet systems and spinnaker sheets on dinghies, catamarans, sportsboats and small keel boats to 9m (30ft)
RF55410 when paired with a RF56330B and a RF35101 lashed to the becket produces a powerful 8:1 mainsheet system for use on catamarans to 5.5m (18ft). This can be increased to 9:1 by replacing the RF35101 with a RF35202
Halyard, vang and backstay applications on boats to 8m (26ft)
Control line applications on larger yachts
Awesome ratchet block holding power Quite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of Ronstan patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of Ronstan nearest competitior. The unique sheave design has 12 gripping faces which directly resist loaded line movement. Traditional designes have only 8 faces with an angled resistance to line movement. Ronstan Generation 2 design has straight resistance faces which both distribute the load and minimise rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.
The sailboat hardware market and the architectural rigging market are worlds apart, but in Australia they're both dominated by one powerhouse player. Ronstan® end-to-end design, manufacture and distribution operation has grown to become the only serious competitor. Ronstan head office in Melbourne, Australia is home to Ronstan state-of-the-art design and manufacturing facilities, and Ronstan advanced warehousing and global distribution system. Ronstan home market is further supported by sales offices in Sydney, Brisbane and Perth. Internationally, Ronstan one of the top three sailboat hardware brands in the world, instantly recognised and respected in 45 countries. Ronstan passionate team has worked tirelessly to develop export markets, establishing manufacturing facilities in Denmark and Indonesia and sales offices and distribution facilities in the United States - all the while building strong relationships with Ronstan distribution partners around the world.