Cap Vert Information, Review, Specs

Cap Vert Drawing
Make
Cap
Model
Vert
Builder
Designer
Jean-Jacques Herbulot
Number Built
Production Year(s)
1959 - ??

The Cap Vert stands as a seminal achievement in the career of legendary French naval architect Jean-Jacques Herbulot. Introduced in 1957, this 7-meter (23-foot) coastal cruiser was a pioneer in the democratization of yachting, utilizing innovative plywood construction to provide a seaworthy, affordable vessel for the post-war generation. Built primarily by yards such as Silvant and Chantier Naval de la Plaine, the Cap Vert was designed to be robust enough for offshore passages while remaining manageable for a small crew. According to the Association des Propriétaires de Cap-Vert, the design was specifically tailored to the requirements of the Glénans sailing school, which needed a boat capable of handling the rigorous conditions of the Atlantic coast. The vessel’s silhouette is instantly recognizable by its high freeboard, reverse sheer, and hard chine hull—features that maximize internal volume and structural rigidity without the need for complex, expensive hull curvatures.

Sailing Performance & Handling

Under sail, the Cap Vert is characterized by exceptional stability and a surprisingly "stiff" profile for its size. The hard chine hull provides a significant amount of form stability; as the boat heels, it quickly settles onto its chine, creating a reliable platform in a breeze. While not a lightweight racing machine, the boat performs admirably in moderate to heavy air, where its weight and hull shape allow it to punch through chop with more authority than modern, lighter equivalents. Technical reviews from Voiles et Voiliers highlight its balanced helm and predictable tracking, making it an ideal trainer for offshore navigation.

Most models were equipped with a heavy iron centerboard, which significantly lowered the center of gravity while allowing for a shallow draft of approximately 0.80 meters with the board up. This configuration makes the Cap Vert particularly adept at coastal "gunkholing" and tidal navigation. Although its sail-area-to-displacement ratio is conservative by modern standards, the boat carries its canvas well, often outperforming newer designs in survival conditions due to its seaworthy "overbuilt" philosophy.

Interior Comfort & Variations

For a 23-foot boat designed in the late 1950s, the Cap Vert offers an impressively functional interior. The high freeboard and raised deck design provide significant headroom—nearly 1.75 meters in some areas—which was revolutionary for a small plywood cruiser of that era. The standard layout typically accommodates four adults across a V-berth in the forepeak and two settee berths in the main salon. The "open plan" feel is accentuated by the lack of a full bulkhead between the cabin and the forepeak, a common Herbulot design trait intended to improve ventilation and the perception of space.

Several variations were produced during its long production run. While the centerboard version is the most common, a few rare fixed-keel versions were built for owners prioritizing deep-water stability. The Cap Vert also belongs to a family of "Cap" siblings designed by Herbulot: the smaller Cap Corse (5.75m), which served as a more compact daysailer/cruiser hybrid, and the Cap Horn (6.5m), which offered a middle ground in terms of size and complexity. The Cap Vert, however, remained the flagship of the range for serious coastal cruising.

The Cap Vert’s cultural footprint is deeply embedded in French maritime history. Its most significant "claim to fame" is its long tenure as the primary offshore training vessel for the world-renowned Glénans sailing school. This association cemented the boat's reputation as a "school of the sea," and it appears frequently in early editions of the "Nouveau Cours des Glénans," the quintessential manual of French sailing. It is often cited in French maritime literature as the vessel that taught a generation of sailors how to navigate the treacherous waters of the Bay of Biscay.

Known Issues & Buyer’s Checklist

Because the Cap Vert is a vintage plywood vessel, prospective buyers must prioritize structural integrity over cosmetic finishes.

  • Plywood Rot: The most critical area of inspection is the hull-to-deck joint and the transom. Water ingress in these areas can lead to delamination and structural rot that is difficult and expensive to repair.
  • Centerboard Trunk: The centerboard trunk is a known weak point. Owners frequently report leaks or "thumping" sounds if the pivot pin has worn down or if the internal housing has been damaged by corrosion of the iron board.
  • Deck Softness: Many Cap Verts were retrofitted with fiberglass skins over the original plywood. If not done professionally, water can become trapped between the glass and the wood, leading to hidden rot. A "thumping" test with a plastic hammer is essential to check for voids.
  • Chainplates: Inspect the areas where the shrouds meet the deck; the internal backing plates often require reinforcement or replacement if the original plywood has softened over decades of tension.

Community & Resources

The legacy of the model is preserved primarily by the Association des Propriétaires de Cap-Vert, which maintains an extensive archive of original plans, technical drawings, and restoration logs. This group is the definitive resource for anyone seeking to restore a Cap Vert to its original specifications or seeking advice on modernizing the rig.

The Verdict

The Cap Vert is a rugged, character-filled classic that offers a level of seaworthiness rarely found in modern 23-footers. It is an "honest" boat—simple to understand, rewarding to sail, and surprisingly spacious.

Pros:

  • Remarkable headroom and interior volume for its length.
  • High form stability and excellent handling in heavy weather.
  • Deeply historical design with a dedicated enthusiast community.
  • Shallow draft capability with the centerboard version.

Cons:

  • Plywood construction requires diligent, ongoing maintenance to prevent rot.
  • Slow performance in very light winds due to high wetted surface area.
  • Original iron centerboards are prone to heavy corrosion and jamming.

Measurements

Construction & Hull

Construction Material
Fiberglass/Wood Composite
Hull Type
Monohull Sailboat
Keel Type
Centerboard
Rudder
1x —
Ballast
-
Displacement
4000 lbs
Water Capacity
-
Fuel Capacity
-

Dimensions

Length Overall (LOA)
26.25 ft
Waterline Length (LWL)
24 ft
Beam
8 ft
Draft
4.58 ft
Max Headroom
-
Air Draft
-
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Cutter
P (Main Luff)
-
E (Main Foot)
-
I (Foretriangle Height)
-
J (Foretriangle Base)
-
Forestay Length (est)
-
Sail Area
318 sqft

Calculations

Sail Area / Displacement (SA/D) Ratio
20.19
Ballast / Displacement Ratio
Displacement / Length Ratio (D/L) Ratio
129.17
Comfort Ratio
15.7
Capsize Screening Formula
2.02
Hull Speed
6.56 kn