Mull Ocean 40 Information, Review, Specs

Sailing Performance & Handling

The Ocean 40 reflects Gary Mull’s philosophy that a cruising boat should not be a "slug." With a fin keel and a large spade rudder, the boat is remarkably responsive for a vessel of its displacement. Because Mull integrated IOR (International Offshore Rule) design principles into the hull, the Ocean 40 tracks well upwind and exhibits a high degree of "feel" through the helm. According to technical assessments of Mull’s design era found in archives from Cruising World, his designs were noted for having a "sweet spot" in moderate air, allowing them to outpace heavier full-keel cruisers of the same length.

The Sail Area to Displacement (SA/D) ratio of the Ocean 40 is typical for a performance-oriented cruiser of the early 1980s, providing enough power to keep the boat moving in light winds while remaining manageable for a short-handed crew when the breeze freshens. Owners often report that the boat feels stiff and predictable, though, like many IOR-derived shapes, it can become lively off the wind in a following sea. The spade rudder provides excellent maneuverability in tight marinas, a significant advantage over the long-keel or skeg-hung designs common in the 40-foot cruising market at the time.

Interior Comfort & Variations

Inside, the Ocean 40 reflects the craftsmanship associated with the Taiwan yards of its era. The interior is characterized by extensive use of solid teak and high-quality joinery, creating a warm, traditional atmosphere that contrasts with its modern exterior lines. Most configurations feature a classic offshore-friendly U-shaped galley to port and a navigation station to starboard. The main salon typically utilizes a drop-leaf table flanked by settees, providing ample seating for a full crew.

Variations on the hull include the "Mull 40" and the slightly larger "Mull 42" sibling, which often shared similar interior appointments but offered expanded aft cabin options. In the Ocean 40, the master cabin is generally located forward with a V-berth, while a smaller quarter berth or a modest aft cabin provides additional sleeping quarters. Headroom is generous throughout the main cabin, usually exceeding 6’3”, which was a selling point for the North American market. The storage capacity is substantial, with deep lockers designed for long-range provisioning, reflecting Mull's intent for the boat to serve as a serious coastal or blue-water voyager.

Known Issues & Buyer’s Checklist

Prospective buyers of a Mull Ocean 40 must account for the specific construction methods of the King Dragon yard and the age of the vessel. The following areas are high-priority for any professional survey:

• Teak Deck Integrity: Like many Taiwan-built boats of the 1980s, the Ocean 40 often came with thick teak decks screwed into a fiberglass-cored sub-deck. Over decades, the bungs and caulking can fail, leading to water intrusion into the core. Evidence of "soft spots" or brown staining on the interior headliner is a significant red flag.
• Stainless Steel Metallurgy: Some components, specifically chainplates and pulpits sourced from early 1980s Asian foundries, have been known to exhibit crevice corrosion. A thorough dye-penetrant test of the chainplates is recommended if they have not been replaced.
• Osmotic Blistering: While the hulls are generally stoutly built, reports of hull blistering are common for this era of fiberglass production. It is essential to inspect the hull after a period of drying to identify any hidden "osmotic pox."
• Rudder Post and Bearing Wear: The spade rudder design puts significant stress on the rudder post and bearings. If there is noticeable "play" or vibration in the steering, the bushings may require replacement to ensure safety in offshore conditions.

The Verdict

The Mull Ocean 40 remains a highly respected choice for the sailor who refuses to sacrifice performance for comfort. It bridges the gap between a dedicated racer and a heavy-displacement cruiser, offering a timeless aesthetic and a hull that can handle blue-water conditions with grace.

Pros:

• Exceptional Pedigree: Designed by Gary Mull, ensuring a fast and well-balanced hull.
• Interior Craftsmanship: High-quality teak joinery provides a luxury feel that modern production boats struggle to match.
• Maneuverability: The fin keel and spade rudder configuration make it much easier to handle under power than traditional cruisers.

Cons:

• Maintenance Intensity: The extensive teak (especially on deck) requires significant upkeep or expensive replacement.
• Aged Systems: Original electrical and plumbing systems are likely reaching the end of their service life and will require modernization.
• Market Rarity: As a relatively low-production model, finding replacement parts specific to the deck hardware may require custom fabrication.