Design Brief & Intent
The design brief for the R.N.S.A. Twenty-Four was to create an offshore racer that prioritized structural integrity, sea-kindliness, and budget-friendly construction without sacrificing performance under the prevailing Royal Ocean Racing Club rating rules. Built predominantly of wood—typically mahogany or teak planking over steam-bent oak frames—the Twenty-Four was characterized by a remarkably narrow beam of seven and a half feet and a deep, traditional full keel. What truly set the design apart from other Laurent Giles creations of the era, such as the beamier and heavier Vertue class, was its heavily cutaway forefoot. This profile change, borrowed from Illingworth’s radical racer Myth of Malham, was intended to dramatically reduce wetted surface area and minimize drag.
Internally, the cabin arrangement reflected a no-nonsense, functional philosophy. Accommodations were spartan but highly practical for offshore passages. The narrow beam limited interior volume, preventing the installation of expansive modern amenities. Instead, the cabin was fitted with simple, robust joinery, comprising basic pipe berths or settee berths, a compact galley situated near the companionway for optimal ventilation, and a modest navigation station. Headroom was limited, and the overall fit-out was designed to keep weight low and centralized. The quality of the carpentry, executed by premier yards such as Camper & Nicholsons and AH Moody & Son, was exceptional, relying on traditional joinery techniques that have allowed surviving hulls to endure for nearly eight decades.
Variations & Configurations
Because the R.N.S.A. Twenty-Four was conceived as an early offshore one-design class, the underlying hull shape remained strictly uniform across the production run. However, the boats exhibited considerable variation in their rigs and interior fit-outs depending on the preferences of their original owners and the yards that built them. While AH Moody & Son constructed the initial prototype, Pocahontas, in 1947, Camper & Nicholsons built the first batch of five production boats—including Illingworth’s own Minx of Malham and the famous club yacht Samuel Pepys. In total, approximately 15 to 16 units were completed between 1948 and 1953.
The standard sail plan was a fractional sloop rig designed by Illingworth himself, which utilized running backstays to keep the foretriangle rigid. This configuration allowed for a highly adjustable mast bend and precise sail shape controls, a novelty for offshore cruisers of the late 1940s. However, some owners opted for entirely custom rigs to suit specific long-distance voyaging plans. Most notably, the legendary voyager Bill King rigged his R.N.S.A. Twenty-Four, Galway Blazer, as a ketch for his solo transatlantic passage in 1949. Other owners chose masthead configurations or simplified cruising rigs to eliminate the operational complexity of running backstays. Additionally, several boats were originally delivered without auxiliary engines to save weight and cost, while others were fitted with tiny 4 to 5 horsepower petrol or diesel engines.
Sailing Performance & Handling
Under sail, the R.N.S.A. Twenty-Four is a study in classic heavy-displacement dynamics. With a displacement of 9,650 pounds on a 24-foot waterline, its displacement-to-length ratio of 311.63 places it firmly in the heavy-cruiser category. This mass, combined with the narrow hull form, yields a high motion comfort ratio of 38.56. At sea, this translates into an incredibly soft, predictable motion, with none of the violent motion or pounding characteristic of modern flat-bottomed designs. The capsize screening ratio of 1.41 is exceptionally low, representing a hull that possesses tremendous reserve buoyancy and an inherent physical resistance to roll-overs, making it highly secure in blue-water conditions.
However, these offshore safety characteristics come with trade-offs in light-wind performance. The sail area-to-displacement ratio of 13.94 indicates that the R.N.S.A. Twenty-Four is relatively underpowered in light airs. To maintain momentum in under ten knots of breeze, the boat relies heavily on large, overlapping headsails. Conversely, when the wind rises, the boat truly comes into its own. The cutaway forefoot, paired with the deep full keel and transom-hung rudder, grants the boat exceptional directional stability. It tracks as if on rails, requiring minimal helm correction, yet it responds with surprising agility when maneuvered. Under the command of skilled crews, hulls like Samuel Pepys achieved remarkable success, winning line honors in the punishing 1950 Transatlantic Race from Bermuda to Plymouth and demonstrating that the design could maintain high average speeds in heavy weather without losing its docility.
Market Snapshot & Economics
Decades after the final hull slid down the slipway, the R.N.S.A. Twenty-Four has transitioned from an active ocean racer into a highly prized classic. It is exceptionally scarce on the brokerage market, with only a small handful of surviving hulls known to exist worldwide. Consequently, transactions are rare, and these boats are primarily sought after by wooden-yacht preservationists, classic boat enthusiasts, and collectors. Rather than trading on standard production-boat valuations, an R.N.S.A. Twenty-Four's market value is entirely dictated by its historical provenance and structural condition.
Purchasing an unreconstructed model often represents a significant financial commitment rather than a bargain. Prospective owners must weigh the purchase cost against the inevitability of complex, highly skilled shipyard labor. A neglected hull can quickly accumulate refit and restoration costs that dwarf any potential market value, while a turn-key, meticulously restored vessel commands a notable premium among classic yacht circles. For those dedicated to maritime heritage, the economics are driven by the privilege of stewardship rather than financial return.
Known Issues & Triage
As with any wooden yacht constructed in the mid-20th century, the primary threat to the longevity of an R.N.S.A. Twenty-Four is structural decay. Traditional carvel construction using mahogany or teak over oak frames is highly susceptible to freshwater rot, galvanic corrosion, and fastener fatigue. A prominent vulnerability is the deterioration of the steam-bent oak frames, which can crack or break over time under the constant stress of the hull planks swelling and contracting. This frame cracking is a critical structural failure that must be triaged immediately to prevent the development of hard spots in the planking.
Another major concern is the condition of the hull fasteners. Many of these yachts were fastened with copper rivets, which, while highly durable, can fail if the surrounding wood softens or if there is galvanic action with dissimilar metal fittings. Inspecting and systematically refastening the hull below the waterline is a standard requirement for any restoration. Additionally, the iron or lead ballast keel is attached using heavy keel bolts that are prone to crevice corrosion or wasting. Because many of these boats have spent decades in saltwater, removing and inspecting at least a sample of these keel bolts is an essential triage step. The deck structure, often constructed of laid teak over marine plywood or soft-wood tongue-and-groove decking, is another common source of leaks, leading to deck beam rot and cabin trunk deterioration. The tragic scrapping of Andrillot II in 2016 due to unrepairable, extensive rot and insect damage serves as a stark reminder of the consequences of deferred maintenance on these historic hulls.
Modernization & Upgrades
For the dedicated owners undertaking restorations of the R.N.S.A. Twenty-Four, modernization is focused on preserving the boat's classic lines while incorporating reliable, modern systems for short-handed cruising. The most common mechanical upgrade is the replacement of obsolete, unreliable inboard engines with compact, lightweight marine diesels. While the original hulls were often underpowered or entirely unpowered, retrofitting a modern, reliable two-cylinder diesel engine significantly improves safety in crowded modern marinas. Furthermore, the boat's narrow engine compartment and heavy-displacement hull form have made it an excellent candidate for electric propulsion conversions, with owners utilizing modern direct-drive electric motors paired with custom lithium iron phosphate battery banks.
On deck, the modernization of the rig is often necessary to facilitate easier single-handed or double-handed handling. Veteran owners frequently replace the complex, labor-intensive running backstays with modernized fractional rigging configurations or self-tacking foresails, allowing the boat to be sailed without a large crew. Below decks, completely rewiring the outdated, dangerous DC electrical systems is standard practice. Modern installations emphasize low-draw LED lighting, high-efficiency refrigeration, and simple, independent solar charging arrays to minimize the need for heavy, space-consuming generator systems.
The Verdict
The R.N.S.A. Twenty-Four stands as a monumental achievement in postwar yacht design, representing a brilliant collaboration between Jack Laurent Giles and Captain John Illingworth. It successfully challenged the convention that offshore racing was exclusively the domain of large, heavy-displacement yachts. Today, it remains a purist's dream: an exceptionally beautiful, sea-kindly, and historically significant classic that delivers an unmatched motion comfort and structural solidity at sea. However, it is not a boat for the casual weekend sailor. Owning an R.N.S.A. Twenty-Four requires a deep commitment to traditional shipwright skills, a willingness to accept limited interior volume, and an ongoing investment in wood preservation. For those willing to take on the responsibility of stewardship, it offers an incomparable sailing experience that connects the helmsman directly to the golden age of ocean racing.
Pros:
- Unmatched motion comfort and sea-kindliness in heavy weather.
- Exceptional historical provenance and classic aesthetic appeal.
- Outstanding directional stability and tracking under sail.
- Highly robust construction from prestigious postwar shipyards like Camper & Nicholsons.
- Active community appreciation and eligibility for prestigious classic yacht regattas.
Cons:
- High maintenance demands and significant potential for structural rot.
- Extremely scarce on the brokerage market.
- Underpowered in light wind conditions.
- Very limited interior living space and low headroom due to a narrow beam.
- Complex traditional systems, such as running backstays, require skilled handling.
