King 40 Information, Review, Specs

Sailing Performance & Handling

The King 40 is defined by its IRC-optimized hull form, which favors a high ballast-to-displacement ratio and a powerful, non-overlapping sail plan. With a displacement of approximately 16,000 lbs and a deep T-bulb keel, the boat exhibits exceptional stiffness and "upwind grunt," a characteristic frequently noted by Mills Design. Unlike many lightweight sprinters that struggle in a chop, the King 40 utilizes its moderate displacement to maintain momentum through waves, making it a formidable contender in varied sea states.

The steering is exceptionally communicative, thanks to a large-diameter carbon wheel and a high-aspect rudder that provides grip even when pressed hard on a reach. In technical terms, the boat’s Sail Area/Displacement ratio (typically hovering around 26) indicates a vessel that transitions quickly to its hull speed in light air but remains manageable when the breeze refreshes. According to editorial testing by Sailing World, the boat tracks with remarkable precision, allowing the helmsman to "lock in" on the windward string. Downwind, the King 40 utilizes a retractable carbon bowsprit to fly large asymmetric spinnakers, facilitating high-speed planning and stable gybing angles that are less temperamental than traditional symmetric setups.

Interior Comfort & Variations

While the King 40 is unapologetically a racing machine, its interior reflects the "performance cruiser" ethos of the Summit brand. The layout is surprisingly voluminous for a 40-foot racer, featuring three cabins and a functional, if minimalist, galley. The use of composite materials for the interior modules keeps the weight centered and low, while the finish—often a mix of white gelcoat and light wood accents—provides a sense of airiness that is often lacking in dedicated race boats.

There is a distinct sibling relationship between the King 40 and the smaller Summit 35, which shares the same design language and IRC focus. While the King 40 offers a full-beam master-style cabin forward and twin aft berths, the 35 is more compact. Crucially, the King 40’s interior was designed to be modular; for serious offshore campaigns, much of the cabinetry can be protected or simplified, yet for weekend coastal cruising, it provides genuine headroom and basic comforts like a fully enclosed head and a proper navigation station. This versatility was a primary selling point for owners who wanted a boat capable of winning the Newport Bermuda Race while still being hospitable for family outings.

Popular Mentions & Media

The King 40 gained significant cultural traction in the sailing world through the success of specific hulls. Soozal, a well-known King 40, achieved a legendary status on the West Coast and Australian racing circuits, proving the design’s longevity and competitiveness across different handicap systems. The model’s debut was one of the most covered launches of 2009, with Yachting World and Sailing World providing extensive technical deep-dives into how Mark Mills successfully translated custom grand prix features into a production-friendly format.

Known Issues & Buyer’s Checklist

Prospective buyers of a pre-owned King 40 should focus their inspections on the high-load areas typical of a grand prix racer.

1. Keel Attachment and Grid: Given the high righting moment of the T-bulb keel, the internal fiberglass grid and floors should be inspected for any signs of movement or stress cracking, particularly if the boat has a history of hard groundings during racing.
2. Deck Hardware Sealing: The King 40 is equipped with premium hardware, often from Harken or Lewmar. Over time, the high loads from winches and clutches can compromise the bedding of these fittings. Check for moisture ingress in the balsa or foam core around the pit and primary winch islands.
3. Rudder Bearing Wear: Due to the high aspect ratio of the rudder, the bearings (often JP3 or similar high-end brands) can develop "slop" or play. Replacing these is a standard maintenance item but can be costly.
4. Rigging Fatigue: Most King 40s were delivered with Hall Spars carbon masts and rod rigging. A thorough NDT (non-destructive testing) of the rod rigging and a visual inspection of the mast at the spreaders and hounds are essential if the rig is more than 7–10 years old.

Community & Resources

The King 40 benefits from the technical support of Mills Design, which remains active in providing rating optimizations for owners looking to update their IRC or ORC certificates. While there is no longer a formal "class association" in the traditional sense, the global fleet is well-documented through the Mills Design technical archives, which offer insights into sail plan developments and keel modifications that have evolved since the boat's inception.

The Verdict

The King 40 remains one of the most successful "crossover" yachts of the last two decades, offering a level of build quality and design sophistication that holds its value well in the brokerage market.

Pros

• Exceptional Versatility: Equally at home on a beer-can race course or a 600-mile offshore classic.
• IRC Optimization: Built specifically to perform well under handicap systems, ensuring it remains competitive years after launch.
• High Build Quality: Benefiting from the Carroll Marine heritage, the composite construction is robust and purposeful.

Cons

• Complex Systems: The carbon rig and high-load hardware require a knowledgeable crew and a higher maintenance budget.
• Draft Limitations: The deep performance keel may limit access to shallower harbors and cruising grounds.
• Sparse Comforts: Compared to a dedicated cruiser like a Beneteau Oceanis, the interior is functional rather than luxurious.