Design and Construction
Gade Marine built the Atlantic 23 as a solid fiberglass hull with a swing keel, giving a minimum draft of 0.35 meters and a maximum of 1.6 meters anchor. The 30 percent ballast-to-displacement ratio and 141.37 displacement-to-length figure place her firmly in the light-displacement trailerable camp, while the 2.52 capsize screening result and 10.14 comfort ratio describe a boat tuned for sheltered-water day sailing rather than offshore passage work. Her 5.86-knot hull speed and 559.60 pounds-per-inch immersion reflect the modest buoyancy and waterplane of a 23-footer asked to do little more than coast.
Rig and Sail Plan
The standard masthead sloop rig carries 185 square feet of working sail — a 9.2 m² mainsail with an 8.8-meter foot, an 8.0 m² jib, and an 18.0 m² genoa, plus a 40 m² spinnaker for downwind reaching anchor. A fractional-rig alternative was offered with a larger 10.8 m² mainsail and a smaller 14.5 m² genoa, trading headsail power for mainsail drive. The sail-area-to-displacement ratio of 17.52 and an S# of 3.58 mark her as a moderately powered light-air performer for her size, not a heavy-weather hull.
Accommodations and Intended Use
The available material names no interior arrangement, berth count, or tankage for the Atlantic 23. What the numbers do establish is a 2.5-meter beam on a 7.1-meter hull — beamy enough for a small cuddy or open-plan dayboat layout, but the sources are silent on how the volume was finished. With 70 built in a single year, she reads as a focused one-off design.
Known Issues
The swing-keel arrangement itself is the only feature that invites owner vigilance by design, since pivot hardware and trunk seals on such keels are conventionally prone to wear — but the sources name no specific failure on this model.
Refits and Ownership
Ownership of a 1976-vintage Atlantic 23 means living with a 50-year-old solid fiberglass hull and a swing keel whose pivot and lifting gear are now decades old. The fractional-rig option also complicates used-boat identification, since two different sail plans were offered and a buyer must confirm which rig a given hull carries.
The Verdict
The Atlantic 23 is a curious footnote in small-boat history: a beamy, light-displacement German swing-keel sloop of which only 70 were made in a single year. She offers a clean sail-plan choice and easy trailering draft, but her scarcity and undocumented interior leave her suited to the enthusiast who values rarity over support network.
Pros
- Swing keel drops to 0.35 m for shallow exploration and trailering
- Two rig options (masthead or fractional) tailor power to owner taste
- Light 1,000 kg displacement with 30% ballast for a stiff small-dayboat feel
Cons
- Only 70 built in 1976 — minimal class support or spare parts
- Undocumented interior, tankage, and berth layout
- Solid fiberglass swing keel demands age-related pivot and seal scrutiny
