Design and Construction
Karlsson's 340 stretches 33.46 feet on the waterline length of 28.38 feet, with a beam of 11.15 feet giving her an L/B ratio of 2.95 — a moderately broad hull that, combined with a displacement of 14,330 pounds and 5,071 pounds of lead ballast, produces a ballast ratio of 37 percent and a displacement-length ratio of 279. That loading puts her firmly in the heavy-displacement cruiser class, and the 198 kg/cm (1,109 lbs/inch) immersion rate tells you she sits deep and moves slowly in the water when loaded. The hull is solid fiberglass; the deck is die-cast fiberglass; the keel is lead and the fuel tank is stainless steel. The wetted surface measures about 33 square meters, a figure consistent with a full-length cruising hull rather than a stripped-out racer. Her capsize screening value is 1.84 and a Motion Comfort Ratio of 28.1 to 30.7 place her among the steadier, more forgiving designs of her size — numbers that match the boat's evident brief as a short-handed family cruiser rather than a regatta weapon.
Rig and Handling
The 340 is built as a masthead sloop, and the sail plan drives a theoretical hull speed of 7.1 knots for a displacement hull of this length. Under power, the recorded performance splits by engine: a Volvo Penta 2003 delivers a max speed of 7.0 knots, while a later Volvo Penta MD2040 is calculated at about 6.5 knots, both through a shaft drive transmission. The fin keel gives her a draft of roughly 1.60 to 1.70 meters (5.25 to 5.55 feet) depending on load, which keeps her within most marina depths while preserving a useful ballast-driven righting moment. The masthead rig is a simple, robust arrangement that suits a cruising sailor who values predictability over a tall, twitchy fractional setup.
Accommodations
Below, the 340 is laid out with two cabins and 3+2 berths, finished throughout in mahogany — the same warm, traditional interior wood many Nordic cruisers of the era employed. The two-cabin arrangement suggests a forward and aft sleeping space with the saloon settees making up the additional berths, a plan that privileges privacy and enclosed stowage over an open bunk-room feel. With 53 gallons of water and 40 gallons of diesel, the interior systems support extended coastal or modest offshore passages without constant replenishment runs.
Known Issues and Refits
A period rig photograph of a 1990-hull 340 shows a mast dated 1999 and a Selden furling mainsail, explicitly not the original equipment anchor. A buyer or owner should treat any 340's mast and mainsail handling system as a likely later upgrade rather than factory-fitted, and verify the age and compatibility of the spar and furling gear accordingly.
The Verdict
The Najad 340 is a conservative, well-founded little cruiser from the Karlsson–Najad partnership: heavy enough to be comfortable in a seaway, simple enough in rig and systems to be maintained by a competent owner, and finished in a manner that ages gracefully. She will not win around the buoys, but she was never meant to.
Pros
- Solid fiberglass hull and die-cast deck with lead keel and stainless fuel tank
- Steady sea-kindly numbers: capsize screening 1.84, comfort ratio ~29
- Two cabins and 3+2 berths in mahogany-finished interior
- Draft of 5.25–5.55 feet keeps her into most marinas
Cons
- Original rig frequently replaced — verify mast and furling mainsail age on any example
- Heavy displacement and modest sail area limit light-air performance
