Cunningham/Downhaul Systems



This 6:1 Cunningham is extremely versatile and would likely provide enough power on everything from dinghies and small off-the-beach multihulls right up to small trailerables, allowing you to flatten the main and keep moving forwards instead of sideways in a building breeze. Boats with more modern square-top mainsails will likely need additional purchase; see other systems on this page.

The versatile stainless hook can either be hooked onto an eyelet, stainless D-Ring, or webbing, depending on how the sailmaker has finished the tack. Alternatively for a more modern, lighter solution a custom soft shackle could be created, however keep in mind that the lashing line through the RF25309 must have a tight splice in the head, or cross over/through itself, before connecting to the sail. 

Max Line Size = 6mm (1/4")



12:1 internal system, popular on high performance off-the-beach catamarans such as the A-class. Features an endless sheet exiting both sides of the mast base and leading to RF5 swivel cleat units, for operation on either side of the boat from trapeze. Tails of line are generally looped around shrouds, or tied off at each shroud for easy access.

MWL = 250kg (550 lb) at the eyelet
Max Line Size = 6mm (1/4")

VARIATIONS If a higher MWL of 275kg (600 lb) is required, replace centre RF20711 with an RF20711HL



This 12:1 Cunningham offers more purchase than Cunningham #1, and is ideally suited to boats with more modern, square-top rigs where Cunningham tension is critical to achieve accurate mainsail trim. The 6:1 component is the same as what is seen in system #1, however, in this setup an RF35109HL is lashed to the sail so that a 2:1 strop can be added. This gives a total 12:1 purchase. Because of the relatively limited travel, some tweaking will be required in order to get the strop length right to maximise travel. 

Max Line Size = 6mm (1/4")

Schematics are for illustrative purposes only - products and setup details may vary based on real-life considerations. Further details regarding product specifications and applications may be found on the individual product pages. Please refer to our Definitions & Customer Considerations and Fittings & Equipment General Guidance before selecting a product. If unsure, or for additional guidance in product selection, please feel free to contact us

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