Cal T/4 Information, Review, Specs

Boat drawing
Make
CAL
Model
T/4
Number Built
238
Production Year(s)
1971 - 1972

The Cal T/4 is a spirited small sailboat that embodies the performance-oriented design philosophy for which Cal Boats became renowned. Conceived by the prolific naval architect C. William "Bill" Lapworth, and built by Jensen Marine (the company behind the iconic Cal brand) in the early 1970s, the T/4 was specifically engineered to excel in the then-popular International Offshore Rule (IOR) Quarter Ton racing class. This vessel was envisioned as a "radically new, radically fast" racer, synthesizing cutting-edge design for its era with Cal's reputation for robust, fiberglass construction.

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The Cal T/4 had a brief but impactful production run, entering the market in 1971 and concluding in 1972, with 238 units built. It emerged during a period when the International Offshore Rule (IOR) was a dominant force in sailboat racing, categorizing yachts into "ton" classes to foster competitive racing among boats of similar performance potential. Lapworth's design for the T/4 was a direct response to the Quarter Ton rule, effectively a racing-optimized version of the popular Cal 24, distinguished primarily by its taller rig. This design choice reflected Lapworth's goal to produce a highly competitive and agile racer, showcasing his ability to blend speed with manageable handling. Jensen Marine, the builder, was known for embracing fiberglass as a versatile and durable material, consistently producing performance-oriented yachts that were also regarded as solid, well-built, and tough, characteristics that carried through to the Cal T/4.

Sailing Performance and Handling

With a length overall of just over 24 feet and a waterline length of 21 feet, the Cal T/4 was designed for nimble performance. Its sail area to displacement ratio of approximately 16.25 suggests a vessel capable of respectable performance across a range of wind conditions, particularly in lighter airs where its sail plan can efficiently propel its modest displacement. The boat truly stands out with a high ballast to displacement ratio of 50%, indicating exceptional stiffness and stability, allowing it to stand up to a breeze and carry its canvas well even as the wind builds. This high ballast ratio contributes significantly to its stability and ability to handle more challenging conditions. Furthermore, with a displacement to length ratio around 192.82, the Cal T/4 positions itself as a lighter, more performance-oriented boat for its size, aligning with its racing pedigree. Anecdotal evidence from its era described the Cal T/4 as "radically fast," suggesting a lively and responsive sailing experience. Like many Cal designs, it is generally considered very manageable, even for a single experienced sailor, and is known for tracking well and offering a dry ride, attributes that made Cal boats popular for both racing and cruising.

Accommodations and Layout

As a dedicated Quarter Ton racer, the Cal T/4's interior accommodations are generally spartan, prioritizing performance and crew functionality over extensive cruising comforts. While specific detailed interior layouts are not widely available in common reviews, it is understood that boats of this class and era typically offered a basic arrangement sufficient for overnight racing or short weekend excursions. The design would likely include V-berth forward, rudimentary galley facilities, and possibly quarter berths or settees in the main cabin, all within its modest eight-foot beam. Interior finishes would likely be straightforward, primarily fiberglass with some wood trim, reflecting the functional and durable approach characteristic of Jensen Marine's construction ethos. Storage would be limited but practical for racing gear and essential provisions. Ventilation would depend on standard deck hatches and portlights, common for sailboats of its size from the period.

Measurements

Construction & Hull

Construction Material
Fiberglass (Solid)
Hull Type
Monohull Sailboat
Keel Type
Fin
Rudder
1x Transom-Hung
Ballast
2000 lbs
Displacement
4000 lbs
Water Capacity
-
Fuel Capacity
-

Engine

Engine Make
Engine Model
Engine Type
Engine HP
Engine Count
1
Drive Type
Fuel Type
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Masthead Sloop
P (Main Luff)
23.6 ft
E (Main Foot)
9 ft
I (Foretriangle Height)
30 ft
J (Foretriangle Base)
10 ft
Forestay Length (est)
31.62 ft
Main Sail Area
106.2 sqft
Foretriangle Sail Area
150 sqft
Total Sail Area (Reported)
256 sqft
Total Sail Area (Calc)
256.2 sqft

Dimensions

LOA
24.17 ft
LWL
21 ft
Beam
8 ft
Draft
4 ft
Max Headroom
-
Air Draft
-

Calculations

Hull Speed
6.14 kn
Pounds per Inch Immersion
600.28