Published on November 19th, 2019 | by Rigworks0
Standing Rigging (or ‘Name That Stay’)
Question: When your riggers talk about standing rigging, they often use terms I don’t recognize. Can you break it down for me?
From the Rigger: Let’s play ‘Name that Stay’…
Forestay (1 or HS) – The forestay, or headstay, connects the mast to the front (bow) of the boat and keeps your mast from falling aft.
- Your forestay can be full length (masthead to deck) or fractional (1/8 to 1/4 from the top of the mast to the deck).
- Inner forestays, including staysail stays, solent stays and baby stays, connect to the mast below the main forestay and to the deck aft of the main forestay. Inner forestays allow you to hoist small inner headsails and/or provide additional stability to your rig.
Backstay (2 or BS) – The backstay runs from the mast to the back of the boat (transom) and is often adjustable to control forestay tension and the shape of the sails.
- A backstay can be either continuous (direct from mast to transom) or it may split in the lower section (7) with “legs” that ‘V’ out to the edges of the transom.
- Backstays often have hydraulic or manual tensioners built into them to increase forestay tension and bend the mast, which flattens your mainsail.
- Running backstays can be removable, adjustable, and provide additional support and tuning usually on fractional rigs. They run to the outer edges of the transom and are adjusted with each tack. The windward running back is in tension and the leeward is eased so as not to interfere with the boom and sails.
- Checkstays, useful on fractional rigs with bendy masts, are attached well below the backstay and provide aft tension to the mid panels of the mast to reduce mast bend and provide stabilization to reduce the mast from pumping.
Shrouds – Shrouds support the mast from side to side. Shrouds are either continuous or discontinuous.
Continuous rigging, common in production sailboats, means that each shroud (except the lowers) is a continuous piece of material that connects to the mast at some point, passes through the spreaders without terminating, and continues to the deck. There may be a number of continuous shrouds on your boat (see Figure 1).
- Cap shrouds (3), sometimes called uppers, extend from masthead to the chainplates at the deck.
- Intermediate shrouds (4) extend from mid-mast panel to deck.
- Lower shrouds extend from below the spreader-base to the chainplates. Fore- (5) and Aft-Lowers (6) connect to the deck either forward or aft of the cap shroud.
Discontinuous rigging, common on high performance sailboats, is a series of shorter lengths that terminate in tip cups at each spreader. The diameter of the wire/rod can be reduced in the upper sections where loads are lighter, reducing overall weight. These independent sections are referred to as V# and D# (see Figure 2). For example, V1 is the lowest vertical shroud that extends from the deck to the outer tip of the first spreader. D1 is the lowest diagonal shroud that extends from the deck to the mast at the base of the first spreader. The highest section that extends from the upper spreader to the mast head may be labeled either V# or D#.
A sailboat’s standing rigging is generally built from wire rope, rod, or occasionally a super-strong synthetic fibered rope such as Dyneema ®, carbon fiber, kevlar or PBO.
- 1×19 316 grade stainless steel Wire Rope (1 group of 19 wires, very stiff with low stretch) is standard on most sailboats. Wire rope is sized/priced by its diameter which varies from boat to boat, 3/16” through 1/2″ being the most common range.
- 1×19 Compact Strand or Dyform wire, a more expensive alternative, is used to increase strength, reduce stretch, and minimize diameter on high performance boats such as catamarans. It is also the best alternative when replacing rod with wire.
- Rod rigging offers lower stretch, longer life expectancy, and higher breaking strength than wire. Unlike wire rope, rod is defined by its breaking strength, usually ranging from -10 to -40 (approx. 10k to 40k breaking strength), rather than diameter. So, for example, we refer to 7/16” wire (diameter) vs. -10 Rod (breaking strength).
- Composite Rigging is a popular option for racing boats. It offers comparable breaking strengths to wire and rod with a significant reduction in weight and often lower stretch.
Are your eyes crossing yet? This is probably enough for now, but stay tuned for our next ‘Ask the Rigger’. We will continue this discussion with some of the fittings/connections/hardware associated with your standing rigging.