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TECH CORNER CUNNINGHAMS   SHOP NOW     Cunninghams are used to tension the luff of the mainsail or genoa without adjusting the halyard. Luff tension affects draft position and the fullness of the sail. Cunninghams should be led to the crew so they can be adjusted frequently as wind speed changes. Typical boat length: Small Boat: 22' - 28' (6.7 - 8.5 m) Midrange: 29' - 34' (8.8 - 10.4 m) Big Boat: 35' - 42' (10.7 - 12.8 m) Small Boat Mid- range Big Boat HARKEN PART NUMBER 8:1 Cascaded A 244 2655 2655 2655 2621 B 245 2658 2658 2658 2624 4:1 Cascaded A 348 351 352 2650 2651 2659 — B 349 2652 — C 350 2644 — D 358 389 389 357 4:1 Double-ended Cascaded A 348 2656 — — B 392 — — 12:1 Cascaded A 2640 2604 2664 B 2613 2630 2686 6:1 Double-ended Jib Downhaul A 348 351 2650 2651 2607 B 350 2644 2606 C 338 365 365 150 150 D 339 339 237 237         8:1 Cascaded: The most basic cunningham is a self-cleating 4:1 tackle positioned at the mastbase.   4:1 Cascaded: This simple system leads aft to the cockpit.           4:1 Double-ended Cascaded: This cunningham system is popular on smaller beach cats—it adjusts from the trapeze on either tack and rigs and unrigs easily.   12:1 Cascaded: This simple 2:1 purchase is attached to a 6:1 cascade for a 12:1 system. Used on larger racing and cruising boats.         6:1 Double-ended Jib Downhaul: Many small keelboats like J/24s use a genoa cunningham to adjust draft from the weather rail.