Usa Interclub Information, Review, Specs

Usa Interclub Drawing
Make
Usa
Model
Interclub
Builder
O'Day Corp.
Designer
Sparkman & Stephens
Number Built
Production Year(s)
1946 - ??

The Interclub Dinghy, often simply referred to as the "IC," stands as one of the most enduring legacies of American small-boat racing. Designed in 1945 by the legendary Olin Stephens of Sparkman & Stephens, the boat was specifically envisioned as a "Frostbite" racer—a vessel capable of being campaigned in the harsh winter months of the Northeast United States. At 11 feet, 6 inches, the Interclub was designed to be sturdy enough to handle the rigors of cold-weather utility while remaining agile enough to provide technical, tactical racing. Initially constructed in cold-molded plywood, the class successfully transitioned to fiberglass production, with the O'Day Corporation eventually becoming one of the primary builders during the fiberglass revolution of the 1960s and 70s.

Sailing Performance & Handling

The Interclub is characterized by its cat-rigged configuration and unstayed mast, a design choice that simplifies rigging in freezing temperatures and provides a clean, responsive sail plan. Despite its diminutive length, the IC is known for being surprisingly powerful and somewhat "tender" or tippy, particularly when sailed solo. However, it was designed to be raced by a crew of two, with a combined weight typically ranging between 300 and 350 pounds to keep the boat flat and maximize the efficiency of its 72-square-foot sail.

Handling the Interclub requires a high degree of finesse. Because the mast is unstayed, the sailor uses the mainsheet and vang as the primary tools for controlling mast bend and sail shape. In heavy air, the boat can be a handful; it lacks the buoyancy in the bow found in more modern designs, making it prone to "diving" if not handled carefully downwind. Conversely, in the light, shifting winds of a protected harbor—the typical venue for Frostbite racing—the Interclub’s high sail area-to-displacement ratio allows it to ghost along while heavier dinghies stall. Its tracking is dominated by a large, traditional centerboard, which provides the necessary lateral resistance to tack sharply in tight, crowded starting lines.

The Interclub's cultural footprint is deeply embedded in the history of East Coast yacht clubs, specifically the Larchmont Yacht Club and Manhasset Bay Yacht Club. It is the definitive vessel of the "Frostbite" movement, a tradition of winter racing that began in the 1930s. The boat's development is documented in the design archives of Sparkman & Stephens, where it is listed as Design No. 614. Its longevity is frequently cited in nautical literature as a testament to Olin Stephens' ability to create a "ship-shape" dinghy that performs well under varied loads. The boat has been a training ground for countless America’s Cup and Olympic sailors, who credit the IC’s sensitive handling with sharpening their tactical skills during the off-season.

Known Issues & Buyer’s Checklist

When evaluating a vintage Interclub, particularly those built during the O’Day production era, several technical areas require close inspection:

  • Mast Partner and Step: Because the mast is unstayed, the entire load of the sail is transferred to the mast partner (where the mast passes through the deck) and the step on the keelson. Older fiberglass models may exhibit stress cracking or "crazing" in these areas. Softness in the deck around the partner indicates core delamination, which can lead to structural failure in heavy air.
  • Centerboard Trunk: The trunk is a common site for leaks and structural fatigue. In older wood-reinforced fiberglass hulls, the bond between the trunk and the hull can weaken over time. Ensure the centerboard operates smoothly; a warped board can jam, which is a significant safety hazard in a small dinghy.
  • Weight Consistency: For those interested in competitive one-design racing, the weight of the hull is critical. Older boats that have undergone multiple repairs or have sat uncovered in the rain may "soak up" weight or have heavy patches that exceed the class minimum, putting the sailor at a disadvantage.
  • Hull-to-Deck Joint: On O'Day-built models, the rub rail protects a mechanical and chemical bond. Check for any gaps or signs of water ingress, as these boats are often pulled onto docks or trailers, leading to impact damage at the gunwale.

Community & Resources

The Interclub remains a vibrant class thanks to the Interclub Dinghy Class Association, which maintains the official class rules and coordinates the racing circuit. This organization is the primary repository for technical data, including rigging guides and a list of approved builders. Local fleets remain most active in the New England and Mid-Atlantic regions, where winter racing programs continue to draw large numbers of competitive sailors.

The Verdict

The Interclub is a specialized machine, designed for a specific purpose and a particular type of sailor. It is not a leisurely daysailer for the uninitiated, but rather a refined tool for those who appreciate tactical racing and the history of naval architecture.

Pros:

  • Exceptional Pedigree: Designed by Olin Stephens, ensuring a balanced and seaworthy hull form.
  • Active One-Design Racing: A robust class association ensures the boat remains relevant and holds its value.
  • Simplicity: The unstayed cat rig allows for rapid setup and fewer points of mechanical failure.

Cons:

  • Weight Sensitivity: Performance is highly dependent on crew weight and hull condition.
  • Cold-Weather Focus: Its design favors protected waters; it can be "wet" and uncomfortable in significant chop.
  • Age-Related Wear: Most available models are decades old and require vigilant maintenance of the mast step and centerboard trunk.

Measurements

Construction & Hull

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

Dimensions

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

Rig & Sails

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

Calculations

Sail Area / Displacement (SA/D) Ratio
40.8
Ballast / Displacement Ratio
Displacement / Length Ratio (D/L) Ratio
44.03
Comfort Ratio
2.65
Capsize Screening Formula
3.45
Hull Speed
4.54 kn