Design Brief & Intent
The Lehman Interclub was built with a singular mission: to provide highly competitive, tactically demanding one-design racing and serve as a responsive trainer for yacht club members. Unlike the larger, double-handed sloops of the era, the Interclub was designed as a cat-rigged open dinghy. It featured a plumb stem, a vertical transom, a transom-hung rudder, and a retractable daggerboard. Because fiberglass technology was in its infancy, early hulls featured a minimalist approach. The boat was entirely open, lacking any deck structures, cockpit liners, or built-in seats. Skippers and crew sat directly on the gunwales or the floorboards, relying on hiking straps for leverage.
This sparse aesthetic was complemented by traditional varnished mahogany wood trim, which was eventually phased out or paired with aluminum trim as W.D. Schock standardized production. The design targeted serious racing enthusiasts who valued instantaneous feedback over cruising comfort. It was famously selected for prestigious inter-club matches, including a high-profile US-Mexico regatta in Acapulco in 1952, and became a staple of west coast intercollegiate sailing.
Sailing Performance & Handling
On the water, the Lehman Interclub is an incredibly lively, albeit tender, platform. Weighing in at a mere 105 pounds, the hull is extremely light for its size, which, when paired with a 67-square-foot mainsail, yields an astronomical sail-area-to-displacement ratio of 48.16. This massive power-to-weight ratio ensures the boat accelerates instantly in the slightest puff of wind. The stayed catboat rig is highly tunable, but because the mast is stepped well forward, helmsmen must maintain active mainsheet trim and constant weight management to prevent severe weather helm.
With a capsize screening ratio of 3.75, the hull’s round-bottom bilge and relatively narrow beam of 4.42 feet make it highly sensitive to crew movement. Unlike modern hard-chined dinghies that offer strong initial stability, the Interclub rolls easily and requires its crew to act as a human ballast. The draft ranges from 3.0 feet with the daggerboard fully extended to just 4 inches when retracted, making it exceptionally easy to beach, launch, or transport on a car roof rack. When sailed flat, the boat slips through the water with minimal drag, turning and tacking on a dime. However, it offers virtually no margin for error, earning it a reputation among veteran yacht club racers as a boat that will quickly expose any technical flaws in a sailor's technique.
Known Issues & Triage
The most significant historical vulnerability of the Lehman Interclub is its lack of built-in flotation. In its original factory configuration, a capsize meant the hull would swamp completely, requiring a dedicated support boat with a pump to rescue the vessel, as it could not be self-rescued from the water. Over the years, class rules and safety requirements prompted owners to install heavy-duty inflatable buoyancy bags or hand-shaped foam blocks under the gunwales to prevent the boat from sinking to its gunwales when wet.
Another area requiring close inspection is the daggerboard trunk. Decades of hard racing and beaching can wear down the trunk’s internal laminate, leading to stress cracks and slow leaks where the trunk meets the keel. Furthermore, the original stayed aluminum masts and mast steps are prone to fatigue. The forward-stepped mast puts immense downward pressure on the step; over time, the fiberglass support structure underneath can sag or de-laminate, throwing off rig tension and mast rake.
Modernization & Upgrades
Veteran owners of the Lehman Interclub focus their efforts on safety, rigging efficiency, and structural preservation. Modern safety standards make the addition of secure, high-volume dual buoyancy bags mandatory for any active racing. These are typically strapped down using custom webbing anchored directly to the hull to ensure they do not pop out during a capsize.
Rigging layouts have also seen extensive modernization. Replacing heavy, original wire halyards with high-modulus polyethylene lines reduces weight aloft and improves safety. Adding a modern, high-purchase boom vang (often 8:1 or 10:1) and a sleek Cunningham system allows solo sailors and light crews to flatten the sail and de-power the rig when the breeze builds. Additionally, owners frequently reinforce the high-wear areas of the daggerboard trunk and mast step with localized epoxy resin glassing to ensure the boat can handle the increased loads of modern, stiffer sail fabrics.
The Verdict
The Lehman Interclub is a historic gem of the fiberglass transition era. While it lacks the self-rescuing capability and stability of modern trainers, it remains a purist's racing machine that delivers an unmatched level of tactical feedback and handling responsiveness.
Pros
- Extremely lightweight hull is easy to transport on a car roof, store, and launch.
- Outstanding light-wind performance and agility on the racecourse.
- Significant historical pedigree as W.D. Schock’s inaugural fiberglass production boat.
- Simple, easily managed stayed cat rig is perfect for teaching fundamental sail trim.
Cons
- Highly tender with low initial stability, making it prone to sudden capsizes for inexperienced crews.
- Lacks modern self-bailing cockpits or built-in flotation, requiring aftermarket buoyancy bags.
- High-maintenance vintage wood trim on older models requires regular varnishing.
- Extremely scarce on the used market outside of historic Southern California sailing hubs.
