Lapworth conceived the boat for coastal racing, family cruising, and short offshore passages rather than globe-girdling voyaging. At 47 feet 9 inches overall, with a 35-foot waterline, 12-foot beam, moderate 25,000-pound displacement, and roughly 10,000 pounds of ballast, the Cal 48 combines substantial cruising proportions with a performance-minded hull and rig.
Design and Construction
Lapworth paired a moderate-displacement fin keel with a spade rudder, giving the 47-foot-9-inch hull agility without sacrificing the directional steadiness expected by a cruising couple. The hull is solid hand-laid fiberglass. Later examples replaced the earlier solid deck with a balsa-cored arrangement, an important distinction when evaluating a particular hull: the core calls for the usual moisture scrutiny that the earlier layup does not.
The boat’s ballast-to-displacement ratio is near 38 percent, and its capsize screening figure is 1.64. The Cal 48 carries enough lead to feel planted, while its 6-foot-6-inch draft and 260-plus displacement-length ratio place it firmly at the moderate, seakindly end of the period’s performance spectrum rather than among extreme light-displacement racers.
The original Jensen build uses a shoebox joint. Owners should verify that this joint and the deck-to-hull bond remain intact.
Rig and Sail Plan
The masthead sloop rig is straightforward and generously proportioned. On the standard rig, the I and J dimensions are 55 and 19 feet. The mainsail has a 48.16-foot luff and a 21.5-foot foot, for an area just over 529 square feet.
The working jib carries about 509 square feet at 115 percent overlap, while the 150-percent genoa measures nearly 788 square feet. A masthead spinnaker of some 1,607 square feet confirms the boat’s racing pedigree.
Its sail-area-to-displacement ratio of 19.5 helps explain the Cal 48’s reputation for speed. The numbers point to a lively, easily driven hull that rewards clean sail trim.
Handling and Seakeeping
Period assessment and the design ratios tell a consistent story. The Cal 48 is renowned for its seaworthiness in 15 to 25 knots, and the same report describes a balanced, dry ride. That combination speaks to the harmony between Lapworth’s keel and rudder, as well as the moderate beam’s restraint in a chop.
The spade rudder provides authority at the helm, making the Cal 48 a confident handler as the wind builds within that range. Its balance of speed, steadiness, and cruising capability suits coastal racing, family cruising, and short offshore passages.
Accommodations and Tankage
For a 1960s boat of this length, the Cal 48 has a spacious layout for the era. The 35-foot waterline and full 12-foot beam provide more below-decks volume than many contemporary rivals.
Tankage includes 110 gallons of water and 60 gallons of diesel, suggesting a boat intended for weeks aboard rather than weekend sprints. Together, the genuine cruising tankage and open saloon footprint distinguish the Cal 48 as a serious cruiser-racer rather than a stripped-out racer fitted with bunks.
Refits and Ownership
Owning a Cal 48 means dealing with a small, finite fleet. Its tiny production run can make examples scarce and difficult to compare side by side.
The principal construction variable is the balsa-cored deck found on later hulls. Buyers and owners should treat core-moisture testing as routine rather than exceptional. Otherwise, the solid hand-laid hull and simple masthead rig keep long-term upkeep within reach of a competent amateur, provided the original shoebox joint and deck-to-hull bond have been verified as intact.
The Verdict
The Cal 48 is a Lapworth cruiser-racer of uncommon poise: fast for its displacement, dry and balanced in a breeze, and roomy for its day. The tiny production run means every surviving example matters, while the later balsa decks require targeted inspection. Even so, the fundamental design remains a coherent, bluewater-capable sloop.
Pros
- Renowned speed, supported by a 19.5 sail-area-to-displacement ratio
- Balanced, dry ride and proven seaworthiness in 15–25 knots
- Spacious 1960s layout with sensible cruising tankage
- Solid hand-laid hull and the agility of a moderate fin keel and spade rudder
Cons
- Only about thirteen were built, making examples scarce and difficult to compare side by side
- Later balsa-cored decks introduce moisture-risk variables
- The 6-foot-6-inch draft limits some shallow-water gunkholing
