What anchor size and chain length suit an Arcona 340?

For an Arcona 340, a 15 kg modern anchor with 50 m of calibrated 8 mm galvanised chain is a sound starting point for cruising. For frequent exposed overnight anchoring, consider 20 kg, provided the anchor maker's sizing chart, bow roller and handling arrangements support it.

Check bow fittings and windlass

Before ordering, identify the windlass model and chain gypsy specification, then measure the bow roller and anchor locker. An anchor that catches the stem, or chain that jumps the gypsy, makes a poor installation regardless of size.

The Arcona 340 is approximately a five-tonne yacht before cruising stores. Loaded displacement varies with equipment and inventory. That makes 8 mm chain a reasonable starting point; the 10 mm chain used on substantially heavier yachts adds considerable weight forward.

• Gypsy: match both chain diameter and link dimensions. "8 mm calibrated chain" alone is not a complete specification; confirm the required standard with the windlass maker.
• Bow roller: check shank width, fluke clearance, retaining pin position and clearance from the forestay and furling drum.
• Locker: check that chain can fall clear beneath the windlass without piling up and jamming.
• Structure: inspect the roller attachment, backing plates and strong point that will carry anchoring loads.

Choose the anchor size

Around 15 to 16 kg is a practical size for a modern primary anchor on this boat. Candidates include the Rocna Original 15 kg, the Mantus M1 35 lb (approximately 16 kg) and the appropriate Spade model selected from its sizing chart. Their shapes differ substantially. Check the fit with a full-size template before buying.

For sheltered coastal cruising, a well-set anchor in this class is a sound choice. For regular exposed nights, heavier cruising loads or longer periods aboard with the anchor unattended, consider the next size up, commonly around 20 kg. Check the maker's recommendation for your loaded displacement and intended conditions.

A larger anchor gives useful reserve, but cannot compensate for weed, poor setting or insufficient scope. Sand and firm mud generally offer more dependable holding than rock or thick weed. Carry a second anchor of a different design for an alternative seabed or an emergency.

Match chain length to depth

For predominantly shallow Danish anchorages, 40 to 45 m can be sufficient. I would choose 50 m of 8 mm chain for more flexibility when cruising Denmark and Sweden, or 60 m if deeper anchorages are a regular part of the plan.