Ratchet blocks significantly improve performance on hand controlled lines. Ratchet blocks allow you to trim and ease sails more easily and with more control. A ratchet block works just like a ratcheting wrench, it allows the sheave to turn in only one direction. Most Ratchet blocks have an on/off feauture to allow them to also work as a free rolling block. New Ratchet blocks from Harken and Ronstan (the Harken Ratchmatic and the Ronstan Orbit Blocks).
About Harken Ratchet Blocks
The Hexaratchet series is Harken's original line of ratchet blocks. They match the classic harken blocks and feature Hardkote-anodized, Teflon impregnated eight-sided sheaves that are machined from solid aluminum for strength and corrosion resistance. Harken Hexaratchet blocks use free-rolling Delrin ball bearings, sheave, and sideplates that are UV stabilized with carbon black for maximum protection. Highstrength stainless steel straps reinforce Harken Hexaratchet blocks.
Harke Carbo Ratchet blocks are 60% stronger and 30% lighter than the classic Hexararchet blocks. he nylon resin sideplates are densely packed with long-glass fibers for a compact block with a high strength-to-weight ratio. Ball bearings, sheave, and sideplates are UV-stabilized with carbon black for maximum protection. Harken Carbo Ratchet blocks are available in 57 and 75mm sizes and have an on/off switch for the ratcheting feature.
Harken Carbo Ratchmatic blocks are load-sending ratchet block that rolls freeling in both directions under low loads and automatically engages the ratchet as loads increase. Shifting between ratchet and light-air modes is seamless with the Automatic Ratchmatic blocks from Harken. Unloaded main and jib sheets run out freely during mark roundings and asymmetrical spinnakers free instantly during jibes. Harken Ratchmatic automatic ratchet blocks are available in 57mm and 75mm sizes.
About Lewmar Ratchet Blocks
Lewmar's high performance Control Ratchet Blocks
are extremely lightweight and have unprecedented load bearing capacity. The weight advantage comes from a combination of MRT (Metal Replacement Technology) and stainless steel central race and balls. Long Fibre Technology provides you with exceptional strength and durability. Plus, the open design allows you to easily flush out sand and salt, which keeps maintenance simple and your entire operation running a lot smoother.
About Ronstan Ratchet Blocks
Now you can enjoy the flexibility of setting up your fitout exactly to suit yourself. Ronstan is the only company that offers a 40, 55 and 70mm ratchet block with both auto and manual engagement models. With automatic models, 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. Manual modes allow the ratchet mechanism to be switched on or off as required. This is the preferred mainsheet set-up for many top sailors.
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