Daimio 23 Information, Review, Specs

Sailing Performance & Handling

Under sail, the Daimio 23 is characterized by its stability and predictable manners, traits inherent to François Sergent’s design philosophy of creating "seaworthy small ships." With a displacement of approximately 1,500 kg (3,300 lbs) and a ballast ratio near 40%, the boat feels considerably stiffer than many modern 23-footers. This weight allows it to punch through a moderate chop without the hobby-horsing often associated with lighter, flat-bottomed designs.

The sail plan is relatively conservative, usually featuring a high-aspect mainsail and a generous genoa. While it is not a "light-air flyer," it finds its stride in 10 to 15 knots of breeze. Owners often report that the boat tracks well due to its longish fin keel, reducing the helm fatigue common in more modern, spade-rudder designs. However, the Daimio 23 does possess a moderate amount of weather helm when over-canvased; reefing the mainsail early—typically around 18 knots of apparent wind—is essential to keep the boat balanced and the rudder effective.

Interior Comfort & Variations

The interior of the Daimio 23 was considered revolutionary for a 7-meter boat in the early 1970s, maximizing usable space through a "linear" approach. The layout typically features a classic V-berth in the bow, followed by a central saloon with two opposing settees that double as berths, providing a total of four sleeping spots. The headroom is approximately 1.45 meters (4'9"), which, while not standing room for adults, is generous for a vessel of this length and allows for comfortable seated living.

Materials were typical of the CNSO era, utilizing molded fiberglass liners for the "wet" areas and mahogany or teak-veneered marine plywood for the cabinetry. The galley is a compact affair, usually located near the companionway for ventilation, featuring a small sink and a single or double-burner stove. During its production run, the model saw slight variations in deck hardware and interior finishing, later evolving into the Daimio 700, which featured modernized window lines and minor refinements to the cockpit ergonomics but retained the same hull form.

Known Issues & Buyer’s Checklist

Prospective buyers of a Daimio 23 should focus on the typical aging characteristics of 1970s French GRP construction. While the hulls are generally "overbuilt" in terms of laminate thickness, they are not immune to time.

1. Deck Delamination: Like many boats of this era, the Daimio 23 uses a balsa or foam-cored deck. Moisture ingress around the chainplates, stanchion bases, or the mast step can lead to core rot. Buyers should walk the side decks specifically looking for "spongy" spots or audible crunching.
2. Osmosis: While CNSO hulls are robust, early polyester resins were prone to osmotic blistering. A haul-out inspection is mandatory to check for hull "pimples," particularly near the waterline and keel join.
3. Rudder Assembly: The semi-balanced rudder is a known wear point. The pintles and gudgeons can develop significant play over decades of use. Additionally, the internal structure of the rudder blade should be checked for water saturation and swelling.
4. Mast Step Compression: The load of the deck-stepped mast is transferred to the keel via an internal bulkhead or compression post. If the wood at the base of this support has rotted due to bilge water, the deck may begin to sag, leading to rig tension issues and door misalignment in the interior.

Community & Resources

The primary hub for technical support is the French-based owner's community, which remains active due to the boat's enduring popularity in the Lot-et-Garonne region where it was born. Owners frequently share restoration projects and technical drawings through the Association des Propriétaires de CNSO, a group dedicated to the preservation of the yard's legacy models. While no longer in production, parts such as original portlights and specialized hardware are often sourced through French maritime salvage sites or custom-fabricated by the community.

The Verdict

The Daimio 23 is a rugged, honest cruiser that offers a level of seaworthiness rarely found in the sub-25-foot category. While it lacks the speed of modern sportboats, its "big boat" feel and forgiving handling make it an ideal choice for new sailors or those seeking a budget-friendly coastal pocket cruiser.

Pros:

• Robust, heavy-displacement hull provides a secure feel in coastal chops.
• Large production run ensures a wealth of community knowledge and available used parts.
• Surprisingly spacious interior for a 23-foot boat.

Cons:

• Limited headroom may be restrictive for taller sailors on extended trips.
• Heavy for its size, making it less suitable for frequent trailering compared to contemporary "trailer-sailers."
• Early 1970s GRP may require preventative osmosis treatment if not already performed.