The Loch Long One Design (LLOD) stands as a testament to the enduring legacy of Scottish naval architecture and the craftsmanship of Alexander Robertson & Sons. Commissioned in 1937 to celebrate the coronation of King George VI, the vessel was designed by James Miller of St. Monans to provide a more affordable alternative to the expensive 6-meter and 8-meter racing classes of the era. Built primarily at the Robertson yard in Sandbank, the Loch Long was specifically engineered to handle the unpredictable, often choppy conditions of the Firth of Clyde. While the class originated in Scotland, it found a second home in Aldeburgh, Suffolk, creating two distinct but identical fleets that continue to compete today. The design remains a purist's racing keelboat, characterized by its elegant spruce spars, slender beam, and a hull form that prioritizes seaworthiness over raw speed.
Loch Long OD Information, Review, Specs

- Make
- Loch
- Model
- Long OD
- Builder
- William Boag/Robertson & Sons
- Designer
- James Croll
- Number Built
- 138
- Production Year(s)
- 1938 - ??
Sailing Performance & Handling
The Loch Long One Design is frequently described by its helmsmen as a "stiff" and remarkably dry boat for its 21-foot length. With a displacement of approximately 1.2 tons and a heavy iron keel constituting nearly half of that weight, the boat possesses a high righting moment. This allows it to stand up to its canvas in conditions where other dayboats might be forced to reef. According to the Loch Long Association, the boat's handling characteristics are defined by its deep-V entry and balanced rudder, which provide excellent tracking even in a confused sea state.
The technical profile of the LLOD reflects a traditional narrow-beam philosophy. With a beam of just 5'10", the boat does not rely on form stability but rather on its low center of gravity. Under sail, it exhibits a gentle motion and responds well to fine adjustments in shroud tension and jib lead positioning. Unlike modern planing keelboats, the Loch Long is a displacement hull that excels in upwind work, slicing through waves rather than bouncing over them. While it was originally rigged with a wooden mast and cotton sails, modern versions utilize aluminum spars and Dacron, though the class rules remain strictly controlled to ensure that older wooden hulls can still compete fairly against the newer GRP (Glass Reinforced Plastic) versions introduced in the late 20th century.
Popular Mentions & Media
The Loch Long’s cultural footprint is deeply embedded in the history of British competitive sailing. Its launch in 1937 was a major event on the Clyde, and the class has been a staple of the Cove Sailing Club for over eighty years. The vessel's longevity is such that several original hulls are listed on the National Historic Ships UK register, highlighting their significance as examples of pre-war maritime engineering. The class often features in regional BBC documentaries focusing on the heritage of the Holy Loch and the Clyde’s shipbuilding "golden age," often being cited as the "people’s racer" of mid-century Scotland.
Known Issues & Buyer’s Checklist
When evaluating a Loch Long One Design, the primary concern is the material of the hull. The class is divided between traditional carvel-built wooden hulls (typically Larch on Oak) and modern GRP hulls.
- Rib and Timber Integrity: On older wooden models, the steam-bent oak ribs are prone to cracking near the turn of the bilge. Prospective buyers should inspect the "lands" (the areas where planks overlap or meet) for signs of "nail sickness" or weeping, which indicates the copper roves are failing.
- Keel Bolt Corrosion: The iron keel is attached with galvanized steel or bronze bolts. Over decades, the interface between the wood and the iron can lead to electrolytic corrosion. Any evidence of "rust bleeding" from the keel joint or movement in the keel during a hoist is a major red flag.
- Mast Step Rot: Since these are open boats, rainwater frequently collects in the bilge. The mast step, which bears the significant downward compression of the rig, is a common site for freshwater rot.
- Hull-to-Deck Joint (GRP Models): For GRP versions built by later manufacturers like Boag of Largs, the hull-to-deck joint should be inspected for stress cracks, particularly around the chainplates where the rig tension is highest.
Community & Resources
The class is governed by the Loch Long One Design Association (LLODA), which maintains the official register and enforces the strict measurement rules that keep the fleet competitive. The association organizes the annual "National Championships," which alternate between the Scottish fleet on the Clyde and the English fleet at Aldeburgh. For technical restoration advice, the Aldeburgh Yacht Club serves as a secondary hub for owners, providing a wealth of knowledge on maintaining the traditional wooden rigs.
The Verdict
The Loch Long One Design is a quintessential classic that offers a gateway into the world of heritage racing without the astronomical costs of larger "Meter" boats. While it lacks the amenities for cruising, its pedigree as a Robertson-built racer ensures it remains a sought-after model for those who value aesthetics and historical significance.
Pros:
- Exceptional heavy-weather performance for a small keelboat.
- Strong, dedicated class association with a vibrant racing calendar.
- Timeless aesthetic that commands respect in any marina.
- Strict one-design rules prevent "out-spending" the competition.
Cons:
- Wooden hulls require significant annual maintenance and specialized storage.
- Open cockpit provides no shelter, making it strictly a fair-weather dayboat for non-racers.
- Narrow beam and heavy displacement make it slower in very light air compared to modern sportsboats.
Measurements
Construction & Hull
- Construction Material
- Wood
- Hull Type
- Monohull Sailboat
- Keel Type
- Fin
- Rudder
- 1x —
- Ballast
- 700 lbs
- Displacement
- 1800 lbs
- Water Capacity
- -
- Fuel Capacity
- -
Dimensions
- Length Overall (LOA)
- 21 ft
- Waterline Length (LWL)
- 16.25 ft
- Beam
- 5.84 ft
- Draft
- 2.95 ft
- Max Headroom
- -
- Air Draft
- -
Rig & Sails
- Rig Type
- Fractional Sloop
- P (Main Luff)
- -
- E (Main Foot)
- -
- I (Foretriangle Height)
- -
- J (Foretriangle Base)
- -
- Forestay Length (est)
- -
- Sail Area
- 145 sqft
Calculations
- Sail Area / Displacement (SA/D) Ratio
- 15.68
- Ballast / Displacement Ratio
- 38.89
- Displacement / Length Ratio (D/L) Ratio
- 187.27
- Comfort Ratio
- 14.99
- Capsize Screening Formula
- 1.92
- Hull Speed
- 5.4 kn