What anchor size and chain length are suitable for a Hallberg-Rassy 37?

For a Hallberg-Rassy 37, a 25 kg modern steel anchor with 60 metres of calibrated 10 mm galvanised chain is a sound cruising setup, provided the bow roller, windlass and locker can accommodate it. Consider 80 metres for deeper Mediterranean anchorages; 40 to 45 metres suits local, shallow-water cruising but must be checked against depth, tide and bow height.

Check the windlass and bow roller

Before ordering, identify the windlass model and the chain specification stamped on its gypsy, the pocketed wheel that handles the chain. The HR 37 is a substantial cruising yacht, roughly 7.5 tonnes before cruising stores, so choose gear for its loaded condition and intended anchorages.

Equipment varies with build year and previous owners' changes. Do not assume another HR 37 has the same chain or windlass.

• Gypsy: confirm chain diameter and calibration standard. Some 10 mm DIN 766 and ISO chains have different link dimensions and are not interchangeable on the same gypsy.
• Bow roller: check shank clearance, fluke clearance from the stem, and whether the anchor can be secured firmly.
• Locker: check drainage and the clear drop beneath the windlass. Extra chain must pile without jamming the feed.

Isolate the windlass electrically before putting hands near the gypsy or checking beneath it.

Choose anchor design and weight

A modern 20 kg anchor can be adequate for ordinary sheltered cruising, subject to its manufacturer's sizing guidance. For regular overnight anchoring and extended cruising, I would favour the 25 kg class. It gives useful reserve without becoming unnecessarily awkward to handle on this boat.

Check the fit of a Rocna Original 25 kg, a Mantus M1 25 kg or a Spade S100, approximately 20 kg. Assess each individually: equal weight does not mean equal holding ability, and a roll bar can interfere with some bow arrangements.

A heavier anchor helps only if it penetrates and sets properly. Sand, soft mud, weed and hard clay behave differently. Extra kilograms cannot compensate for anchoring in thick weed or failing to test the set. An older 20 kg CQR should not automatically be treated as equivalent to a modern scoop anchor of similar weight.

Match chain length to depth

For this boat, 10 mm calibrated galvanised chain of documented grade and strength is a conservative choice. Match it to the windlass and use compatible, rated connecting hardware. An 8 mm installation may be suitable with an appropriately specified chain and an assessment of the complete system, but diameter alone proves little.