Design and Construction
Gade Marine built the Atlantic 23 with a solid-fiberglass hull and swing keel. Draft ranges from 0.35 meters with the keel raised to 1.6 meters with it lowered, making the boat suitable for shallow water and trailering draft ranges from 0.35 to 1.6 meters.
The 30 percent ballast-to-displacement ratio and displacement-to-length figure of 141.37 place the Atlantic 23 firmly in the light-displacement, trailerable category. Its capsize screening result of 2.52 and comfort ratio of 10.14 describe a boat intended for sheltered-water day sailing rather than offshore passages.
A calculated hull speed of 5.86 knots and immersion figure of 559.60 pounds per inch 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. Its sail plan comprises a 9.2 m² mainsail with an 8.8-meter foot, an 8.0 m² jib, and an 18.0 m² genoa. A 40 m² spinnaker provides additional sail area for downwind reaching the standard sail plan includes these four sails.
Gade also offered a fractional-rig alternative, with a larger 10.8 m² mainsail and smaller 14.5 m² genoa. This arrangement trades headsail power for more drive from the mainsail.
A sail-area-to-displacement ratio of 17.52 and an S# of 3.58 mark the Atlantic 23 as a moderately powered light-air performer for its size, rather than a heavy-weather hull.
Accommodations and Intended Use
The available material doesn’t specify the Atlantic 23’s interior arrangement, berth count, or tankage. What the numbers do establish is a 2.5-meter beam on a 7.1-meter hull—beamy enough for a small cuddy or an open-plan dayboat layout. The sources, however, are silent on how that volume was finished.
With only 70 boats built in a single year, the Atlantic 23 reads as a focused, one-off design.
Known Issues and Ownership
The swing-keel arrangement is the only feature that invites owner vigilance by design. Pivot hardware and trunk seals on such keels are conventionally prone to wear, although the sources identify no specific failure on this model.
Owning 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 can also complicate used-boat identification: because Gade offered two sail plans, a buyer must confirm which rig a particular hull carries.
The Verdict
The Atlantic 23 is a curious footnote in small-boat history: a beamy, light-displacement German swing-keel sloop, with only 70 examples built in a single year. It offers a choice of two clean sail plans and a shallow draft for trailering, but its scarcity and undocumented interior make it best suited to an enthusiast who values rarity over an established support network.
Pros
- Swing keel reduces draft to 0.35 m for shallow-water exploration and trailering
- Masthead and fractional rig options let owners choose how the boat develops its power
- Light 1,000 kg displacement and 30 percent ballast ratio give it a stiff small-dayboat feel
Cons
- Only 70 were built in 1976, leaving minimal class support or spare-parts availability
- Interior arrangement, tankage, and berth layout are undocumented
- Aging swing-keel pivot hardware and seals demand scrutiny
