The right Rocna anchor for your sailboat is the size Rocna's displacement-based chart recommends for your boat length and weight — roughly 9 lb (4.1 kg) for 22–26 ft boats, 22 lb (10 kg) for a Catalina 36-class cruiser, and 33 lb (15 kg) or larger for 40–43 ft vessels. Choose the classic roll-bar Rocna for maximum first-drop set reliability, or the roll-bar-free Rocna Vulcan when bow-roller clearance is tight.
Rocna anchors at a glance
| Option | Design | Finish & durability | Best for |
|---|---|---|---|
| Rocna Original (galvanised) | Concave spade blade + fixed roll-bar for self-righting | Hot-dip galvanised zinc coating (typically 85–100 microns); can be re-galvanised when worn | Primary anchor for active cruisers; best value per pound of holding power |
| Rocna Original (stainless) | Same roll-bar spade geometry | 316-grade marine stainless steel; minimal maintenance, polished finish | Boats kept in the water year-round or owners prioritizing looks; roughly 3–4× the price of galvanised |
| Rocna Vulcan (galvanised) | Roll-bar-free spade blade with self-righting shank geometry | Hot-dip galvanised steel | Boats with narrow bow rollers or bowsprits where a roll-bar won't clear |
What is a Rocna spade anchor and how does it work?
A Rocna anchor combines a concave spade blade with a fixed roll-bar along the crown. When the anchor lands on the seabed, the roll-bar prevents it from resting on its side and always presents the blade at the correct attack angle. As tension comes onto the rode, the blade digs progressively deeper, compressing sediment beneath it and generating high holding power relative to its weight in sand, mud, and mixed bottoms. This self-setting behavior is why Rocna anchors typically set on the first drop, without repeated backing-down attempts.
Rocna anchors are built in hot-dip galvanised steel or stainless steel, and the shank pin hole accepts standard 12 mm and 16 mm pins depending on model size, which is compatible with most production bow roller hardware.
What size Rocna anchor does my sailboat need?
Rocna publishes sizing recommendations based on boat length and displacement — always check both. As working guidance: the 9 lb (4.1 kg) model is correctly sized as a primary anchor for light-displacement boats around 22–26 ft; boats in the 26–28 ft range should consider stepping up to 15 lb (6.8 kg); a Catalina 36 or Hunter 36 (roughly 12,000–14,000 lb displacement) matches the 22 lb (10 kg) model; and 40–43 ft cruisers such as a Catalina 42 or Island Packet 40 should look at 33 lb (15 kg) or larger.
When your boat's displacement is above average for its length, or you anchor in open roadsteads and higher wind exposure, size up. Smaller Rocna models also serve well as kedge, stern, or secondary anchors on larger boats where stowage space is at a premium.
Should I choose the Rocna Original or the Rocna Vulcan?
Both share the same concave spade blade concept; the difference is how they self-right. The Original uses the roll-bar, which adds width to the anchor's profile compared with a traditional plow or CQR. On some production bow rollers — the Catalina 42's relatively narrow factory roller channel is a common example — the roll-bar can contact the roller housing's side cheeks before the shank seats correctly, and owners fitting larger Original models (22 lb and up) often add an extended stainless roller platform for width and forward projection.
The Vulcan deletes the roll-bar and instead relies on its blade and shank geometry to self-right, so it stows and launches cleanly on rollers where the Original won't clear. Before ordering either, measure the interior width of your bow roller housing and compare it against Rocna's published dimensions for the size you are installing — and always test-fit before committing to a chain splice or windlass setup.
Galvanised or stainless — which Rocna finish is better?
The hot-dip galvanised versions are the workhorse choice for sailors who anchor frequently. Hot-dip galvanisation deposits a zinc layer typically 85–100 microns thick — significantly heavier than spray-zinc or electroplating — protecting the steel through multiple seasons of saltwater use, and the anchor can be re-galvanised when the coating eventually wears.
Stainless Rocna anchors use 316 marine-grade stainless steel and suit owners who prioritize aesthetics and minimal maintenance — particularly charter boats or vessels stored in the water year-round. The trade-off is cost: stainless models run roughly 3–4 times the price of the galvanised equivalent at the same weight, with the same holding performance. For most active cruising programs, galvanised is the better value.
How do I get the best holding from a Rocna anchor?
Even the best anchor underperforms on an inadequate rode or short scope. Rocna recommends a minimum of 3:1 scope in calm, protected anchorages and 7:1 or greater in exposed conditions or when winds above 25 knots are forecast. A full chain rode keeps the pull angle low and horizontal along the seabed, which is exactly what the spade blade's loading mechanism depends on; for the 9 lb model, 5/16-inch (8 mm) G4 short-link chain is the standard pairing for boats in its size range.
To confirm the set, pay out full scope, then load the rode with reverse throttle or wind. A properly set Rocna shows no drag over 30–60 seconds of sustained load; use a transit — two fixed shore references held in alignment — to verify the boat is stationary.
Frequently asked questions
What is a Rocna anchor?
A Rocna is a new-generation spade anchor with a concave blade and (on the Original) a roll-bar that self-rights the anchor so it sets on first contact in sand, mud, weed, and mixed bottoms. It is available in hot-dip galvanised and 316 stainless steel.
What is the difference between the Rocna Original and the Rocna Vulcan?
The Original uses a roll-bar to self-right; the Vulcan achieves the same self-righting through blade and shank geometry with no roll-bar, so it fits narrow bow rollers and bowsprits more easily.
What size Rocna do I need for a 30-ft sailboat?
Most 28–32 ft cruisers land between the 15 lb (6.8 kg) and 22 lb (10 kg) models depending on displacement and wind exposure — check Rocna's chart against your boat's actual displacement and size up if it is heavier than average.
Will a Rocna anchor fit my bow roller?
Measure the interior width of your roller housing and compare it with Rocna's published roll-bar width for your size; larger Original models often need an extended roller platform, while the Vulcan usually fits standard hardware without modification.
How much scope should I use with a Rocna?
Use at least 3:1 scope in calm, protected water and 7:1 or more in exposed anchorages or winds above 25 knots, ideally on an all-chain rode to keep the pull angle low.
Is a galvanised or stainless Rocna better?
Holding performance is the same; galvanised costs roughly a third to a quarter as much and can be re-galvanised, while stainless offers a polished, low-maintenance finish for boats kept in the water year-round.