IW-40 Information, Review, Specs

The story of the IW-40 begins in 1973 when Sparkman & Stephens was commissioned for its design, initially for a British yard, South Hants Marine. However, the project was transferred to IW-Varvet on Orust Island, Sweden, in 1974, with production commencing in 1975. IW-Varvet, founded in 1958, had already established a reputation for quality fiberglass yachts, and its collaboration with S&S was a defining characteristic of its most iconic models, including the popular IW-31. Olin Stephens' design philosophy emphasized "long sailing lines and large sail area, with moderate displacement and small wetted surface," aiming for speed and pleasing aesthetics. For the IW-40, this translated into a robust cruiser-racer. During production, Sparkman & Stephens maintained "serious quality control" over the building of the first hull and the overall production setup, ensuring the high standards for which IW-Varvet became known, particularly their "fine plastic work" in fiberglass construction. Notably, some variations occurred during the production run, including a mast that was lengthened by approximately 1.5 meters at some point, catering to typical racing and cruising in protected waters. Production of the IW-40 ran until approximately 1983, with around 35 hulls built.

Sailing Performance and Handling

The IW-40's design ratios reveal a vessel primarily geared towards stability and comfort rather than out-and-out light-air racing, though still offering capable performance. With a Sail Area to Displacement ratio (SA/D) of approximately 15.57, she is moderately powered, suggesting a more conservative cruiser that will perform well in moderate to strong breezes but may require more effort or engine assistance in very light conditions. Her high Ballast to Displacement ratio (B/D) of around 0.45 indicates exceptional stiffness and stability, allowing her to stand up to substantial wind without excessive heeling. This contributes to a comfortable motion in a seaway, a desirable trait for offshore passages. The Displacement to Length ratio (D/L) of approximately 327.36 confirms her as a heavy displacement cruiser. This design choice prioritizes a stable, powerful platform, capable of carrying stores for extended voyages and providing a secure feeling offshore. Owners note that the IW-40 is a "fantastic ocean sailing yacht" that handles "all conditions very well," even in heavy winds exceeding 35 knots, maintaining good speeds while reefed. It is generally agreed by owners that while she may not point as well or excel in light winds compared to lighter performance boats, her robust construction and comfortable ride are significant advantages.

Accommodations and Layout

While specific detailed diagrams are scarce, general descriptions of the IW-40's interior indicate a layout focused on comfort and seaworthiness, consistent with its cruiser-racer design. Given its substantial beam of 11.48 feet and nearly 40-foot length overall, the IW-40 would typically feature a traditional interior arrangement. Reviews and owner comments for similarly sized boats of that era often describe a V-berth forward, a main salon with settees that can serve as berths, a galley, and a navigation station. Many Sparkman & Stephens designs, including other IW-Varvet models, were known for incorporating robust joinery and quality materials, suggesting a durable and aesthetically pleasing finish with wood trim. Adequate storage for provisions and gear would be a priority for a boat designed for cruising, and ventilation would be provided through deck hatches and portlights. The design would likely include a head compartment, possibly with a shower. IW-Varvet's reputation for "fine plastic work" implies well-finished fiberglass liners, often complemented by wooden bulkheads and trim to create a warm and inviting atmosphere below decks.

Owner's Perspectives

Owners of the IW-40 consistently praise its robust build quality and offshore capabilities. Many consider it a "fantastic ocean sailing yacht," highlighting its ability to handle challenging conditions with ease and provide a stable ride. Owners report that the boat feels safe and capable, even in significant wind and waves, allowing them to sail comfortably when other boats might seek shelter. The "quality and strength of the IW40 are of very high standards." While not a light-wind flyer or an extreme performance racer, owners appreciate its predictable handling and comfortable motion. Common themes among owners include satisfaction with its seaworthiness and solid construction, reflecting IW-Varvet's commitment to building durable vessels.