Cal 31 Information, Review, Specs

Built in both the Costa Mesa, California, and Tampa, Florida facilities, the Cal 31 was produced until roughly 1984. It stands as a testament to the transition of the brand from pure racers to sophisticated cruiser-racers. Its sibling models from the same era, such as the Cal 35 and the Cal 39, shared similar design cues, including the move toward more comfortable cockpits and updated interior joinery, though the 31 is often cited by owners as having the "sweetest" helm balance of the late-seventies lineup.

Sailing Performance & Handling

The Cal 31 is frequently lauded for its stiffness and "sea-kindly" motion, a direct result of its significant 4,000-pound lead keel on a 9,000-pound total displacement. This 44% ballast ratio is exceptionally high for a production 31-footer, allowing the boat to carry full sail long after its competitors have been forced to reef. According to a legacy review by Practical Sailor, the boat exhibits excellent tracking and stability, even in heavy air, thanks to the combination of a high-aspect-ratio fin keel and a balanced spade rudder.

Under sail, the boat is a classic masthead sloop with a sail-area-to-displacement ratio that sits in the moderate range. It is not a light-air flyer, but once the breeze exceeds 10 knots, the hull finds its groove. Owners often report that the boat "sails on its lines" even when pressed, avoiding the excessive weather helm that plagued many flat-bottomed designs of the 1970s. The T-shaped cockpit is a standout feature for the helmsman, allowing for a large-diameter wheel that provides enough leverage for finger-tip control while offering comfortable seating positions for the crew.

Interior Comfort & Variations

For a vessel of its era, the Cal 31 interior was considered quite voluminous, benefiting from a 10' 7" beam. The layout is traditional yet functional: a V-berth forward, a head with a shower to port, and a hanging locker to starboard. The main salon features a settee to starboard and a wrap-around dinette to port, which can be converted into a double berth. High-authority editorial reviews from the 1980s highlight the 6' 2" headroom as a major selling point for cruisers.

A significant design variation in the Cal 31 compared to its predecessors was the "T-shaped" cockpit, which moved the helmsman further aft and allowed for a larger social area around the companionway. The interior finish utilized significantly more teak than earlier, sparer Cal models, reflecting the market’s shift toward luxury. While no major hull variants like a "tall rig" were officially marketed as separate models, minor variations in engine choice—primarily the Universal 5416 or 5421 diesel—remain the primary differentiator between used units today.

Popular Mentions & Media

The Cal 31 maintains a quiet but firm reputation in the PHRF (Performance Handicap Racing Fleet) racing circuit. While it never achieved the legendary status of the Cal 40, it remains a "sleeper" in club racing. It is frequently mentioned in regional cruising guides for the Pacific Northwest and the Chesapeake Bay as an ideal "first serious cruiser" due to its ability to handle sudden squalls with composure. While it hasn't been the star of a major Hollywood production, its presence in the sailing literature of the 1980s as a benchmark for the "modern 30-footer" solidified its place in American yachting history.

Known Issues & Buyer’s Checklist

Prospective buyers should approach a Cal 31 with a focus on its age-related technical vitals. While the hulls are solidly built of hand-laid fiberglass, they are from an era when osmotic blistering was common; a professional moisture survey of the hull is essential.

1. Deck Core Integrity: Like many boats of this vintage, the Cal 31 uses a balsa-cored deck. Moisture ingress around stanchion bases, the mast step, and the chainplates can lead to delamination. Pay close attention to "soft spots" when walking on the foredeck.
2. Chainplate Inspection: The chainplates are bolted to bulkheads. Over time, leaks at the deck joint can rot the plywood bulkheads, compromising the rig's structural integrity. This is a common "gotcha" in the Cal owner community.
3. Engine Access and Mounts: While the Universal diesel is a reliable workhorse, the engine mounts on the 31 can settle over forty years, leading to shaft misalignment and vibration. Access for maintenance is decent, but checking the condition of the exhaust riser is a priority.
4. Rudder Bearing Wear: The spade rudder is robust, but the bearings can develop play. If the steering feels "clunky" or loose at the wheel, the upper or lower rudder bushings may require replacement.

Community & Resources

The Cal 31 benefits from a robust and dedicated owner network. The Cal Sailboats Owners Group remains the primary repository for technical manuals, wiring diagrams, and specific Bill Lapworth design notes. While there is no longer a formal manufacturer-backed association, these independent technical wikis provide invaluable support for maintaining the Universal engines and sourcing replacement parts for the original Lewmar or Barient hardware.

The Verdict

The Cal 31 is an exceptionally honest boat that offers a "big boat" sailing experience in a 31-foot package. It is best suited for the sailor who prioritizes structural integrity and heavy-weather composure over the latest interior gadgets or flat-out racing speed.

Pros:

• Stiff and Stable: High ballast ratio makes it one of the most secure-feeling boats in its class.
• Timeless Design: Bill Lapworth’s lines have aged significantly better than the "wedge" designs of the 1980s.
• Ergonomic Cockpit: The T-shaped cockpit is excellent for both single-handed sailing and entertaining.

Cons:

• Balsa Core Risks: Potential for expensive deck repairs if previous owners neglected re-bedding hardware.
• Slow in Light Air: The heavy displacement and moderate sail plan require a breeze to truly perform.
• Aging Systems: Original plumbing and wiring are often due for a total overhaul on unrefitted examples.