Design Brief & Intent
The Cal T/4 was engineered to excel under both the Midget Ocean Racing Club and early Quarter Ton rules. To achieve competitive speeds without sacrificing raw stability, Lapworth eschewed the tall, boxy coachroofs common among cruising 24-footers of the era, opting instead for a sleek, low-profile flush deck. This choice kept the vertical center of gravity low and optimized the deck space for aggressive crew work.
Below deck, the flush-deck configuration creates a surprisingly wide, open-feeling cabin that utilizes the boat's full eight-foot beam. The interior layout features a standard V-berth forward, a compact space for a marine or chemical toilet, and two long settee berths in the main cabin 3. A minimal galley area with a sink and icebox sits near the companionway. True to Jensen Marine standards of the 1970s, the cabin was insulated with fabric-on-foam lining and trimmed in warm mahogany or optional teak, providing a cozy and dry interior that feels far more substantial than the spartan "stripped-out" interiors of later dedicated racing designs.
Sailing Performance & Handling
On the water, the Cal T/4 behaves like a scaled-down offshore racer rather than a tender day sailer. Its performance profile is anchored by an extraordinary ballast-to-displacement ratio of 50 percent, carrying 2,000 pounds of lead in a deep, four-foot fin keel. This heavy concentration of low-slung weight gives the boat immense righting moment and stiffness, allowing it to carry full sail long after its lighter contemporaries have been forced to reef.
With a sail area-to-displacement ratio of 16.25, the T/4 is lively and responsive in light-to-moderate air, tacking quickly and accelerating easily out of tacks. Its displacement-to-length ratio of 192.82 sits firmly in the moderate-light category for its generation, indicating a hull shape that can easily exceed its theoretical hull speed on a reach. The underbody features a soft double chine and a long, flat aft kicker terminating in a balanced, transom-hung rudder. This design maximizes the effective waterline while under sail and provides exceptional helm control in heavy downwind runs.
However, with a capsize screening ratio of 2.02 and a motion comfort ratio of 17.64, the T/4 is still a light, 24-foot boat. It will feel active and athletic in a sea state, and its flat-bottomed entry can slam when driven directly into a short, steep head chop.
Known Issues & Triage
As with any early-1970s production fiberglass boat, the Cal T/4 has aging points that require close inspection. The most prevalent structural concern is deck core rot. Jensen Marine utilized balsa-cored fiberglass for the decks, which can delaminate when water penetrates through poorly bedded deck hardware, stanchion bases, or chainplates. Any potential buyer should perform a systematic percussion test across the flush deck to locate soft or hollow-sounding areas.
Another classic vintage Cal issue is the "Cal Smile"—a cosmetic or structural hairline crack that appears at the leading edge of the keel-to-hull joint. While often just a symptom of the fiberglass fairing flexing over the lead keel, it can occasionally signal loose keel bolts or water penetration into the bilge laminate, requiring the bolts to be retorqued or the joint to be reinforced with epoxy. Additionally, because the T/4 features a deck-stepped mast, the structural compression post below deck must be checked for sagging. Moisture migrating from the deck step can rot the wood block inside the bilge or compress the bulkhead, resulting in slack rigging that cannot be properly tensioned.
Market Snapshot & Economics
Due to its short two-year production run, the Cal T/4 is a rare find on the brokerage market today. It is generally sought after by pocket-cruising purists and vintage racing enthusiasts who appreciate Lapworth's naval architecture. The boat represents an incredibly economical entry point into sailing, often trading at a very low cost due to its age.
Owners should expect the primary investment to lie in refitting and modernization rather than the initial purchase. Because the boat was built to accommodate a simple 3 to 6 horsepower outboard motor on a transom bracket, there are no complex inboard diesel engines or sail drives to maintain. Upgrading the boat with modern high-modulus running rigging, refreshing the basic 12-volt electrical system, and investing in a modern four-stroke or electric outboard motor represent the most common and practical economic outlays.
The Verdict
The Cal T/4 is a highly capable, exceptionally stiff pocket keelboat that punches well above its weight class in terms of heavy-weather stability and pure sailing joy. While its flush-deck design limits standing headroom below, it rewards the sailor with a massive foredeck, an uncluttered layout, and a rock-solid feel at the helm. For those willing to hunt down a rare specimen and undertake basic fiberglass and rigging restoration, the T/4 remains one of the most robust and rewarding 24-footers ever built.
Pros
- Unmatched stiffness and stability for a 24-footer, courtesy of a 50 percent ballast ratio
- Extremely responsive and well-balanced helm, even when sailing in a blow
- Clean, unobstructed flush-deck layout offers excellent working space for the crew
- Simple outboard engine configuration keeps mechanical maintenance costs to a bare minimum
- Well-insulated cabin that avoids the damp, bare-fiberglass feel of comparable period racers
Cons
- Very rare and difficult to locate on the used market due to a short production run
- Low coachroof design limits standing cabin headroom for taller sailors
- Susceptible to balsa core delamination and bulkhead rot if deck leaks are ignored
- High ballast ratio and fixed keel design make it heavy and difficult to trailer regularly
