Series 40 ratchet blocks with either auto or manual engagement models deliver up to 14:1 holding power. With automatic models, the ratchet mechanism engages when load is applied, but switches off when it is released. This lets the sheet run out smoothly and freely; great for rapid easing of the sheet and for gybing asymmetric spinnakers. Manual models allow the ratchet mechanism to be switched on or off as required. This is the preferred mainsheet set-up for many sailors. The unique sheave design has 8 gripping faces which directly resist loaded line movement and straight resistance faces which both distribute the load and minimize rope wear are offset from the radial line, to draw the rope down into the gripping area when under load. The system is compatible with Dyneema®/Spectra® strops, webbing, and carbon connection points.
With auto models, the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. When engaged, and with manual models, the sheave cross-hole geometry eliminates the 'shuddering' ease-out that you can expect from traditional v-groove ratchet blocks. Stand-up kits feature a clatter-free rubber boot. You can attach the Dyneema link so that the block is aligned with the stand-up base or across it.
