Design and Construction
Fiberglass defines the 4600's structure, with a solid fiberglass hull and deck and lead ballast housed in a fin, fin-with-bulb, or stub/centreboard keel depending on the individual boat. The three keel options are a meaningful part of the model's identity. A fin-keel 4600 draws about 8.89 to 9.19 feet dependent on load and is restricted to major marinas, while the fin-with-bulb version draws just 5.51 to 5.81 feet and the stub/centreboard only 4.79 to 5.09 feet, letting that variant into even shallow marinas. The beam measures 14.33 feet against a 39.60-foot waterline, an l/b ratio of 3.22 that comparative reviews rated as more spacious than 73% of all similar sailboat designs.
Rig and Handling
The 4600 is built with a masthead rig and a reported sail area of 1,014 square feet, split nearly evenly between a 508.25-square-foot main triangle and a 505.75-square-foot fore triangle. The I measurement is 59.50 feet and J is 17.00 feet, with an estimated forestay length of 61.88 feet. Comparative rig data shows the 4600 carries more rig than 42% of similar sailboats, which marks it as slightly underrigged, yet its sail-area-to-displacement ratio of 17.67 (17.1 with the ISO reference sail, 20.1 with a 135% genoa) means it is faster than 27% of similar designs in light wind. The theoretical maximal speed of the displacement hull is 8.4 knots with a calculated max near 6.9, and the capsize screening formula sits at 1.89. The Motion Comfort Ratio of 30.9 is more comfortable than 42% of similar designs, an immersion rate of 1,978 pounds per inch underscoring a hull that responds visibly to load changes.
Accommodations
Below, the 4600 is laid out with two cabins and 4+2 berths, a galley, a toilet facility, and comfortable accommodations for the crew. The fresh-water capacity is 150 gallons (567 liters), paired with a 182-liter waste-water tank and a 70-gallon fuel tank. The volume afforded by the 14.33-foot beam and 46.20-foot LOA gives the interior a sense of room that the comparative spaciousness ranking quantifies rather than merely asserts.
Known Issues
No documented structural or systemic defects appear in the surveyed authority records for the Tartan 4600. The principal owner-facing variables are the keel configuration and its draft consequences, and the choice between a Westerbeke or Yanmar 63-horsepower diesel, since auxiliary power was provided by either a Westerbeke or Yanmar diesel engine with 63 horsepower. The absence of recorded failure modes in the source material means the model's used reputation rests on configuration rather than on a pattern of faults.
Refits and Ownership
Ownership considerations center on the engine make installed and the keel selected, because those choices drive both marina access and spares familiarity. The 63-horsepower diesel (Westerbeke or Yanmar) and the three keel drafts are the durable differentiators among boats of the class. A buyer or owner evaluating a refit will find the rigging schedule well documented: mainsail and jib/genoa halyards estimated at 42.1 meters with 14 mm diameter, mainsheet at 35.2 meters and 16 mm, and genoa sheets at 14.1 meters and 16 mm.
The Verdict
The Tartan 4600 is a Jackett-designed performance cruiser that trades absolute volume for a lighter, more responsive hull than most of its peers, with keel options that genuinely broaden where it can cruise. Its comfort and spaciousness rankings are mid-fleet rather than class-leading, and the slightly underrigged masthead plan rewards a working genoa more than a barehead rig.
Pros
- Three keel options from 4.79 ft to 9.19 ft draft suit vastly different cruising grounds
- Lighter than 66% of similar designs with a moderate-racer DL ratio
- 150-gallon water capacity and two-cabin, 4+2-berth layout
- Westerbeke or Yanmar 63 hp diesel auxiliary
Cons
- Slightly underrigged versus 58% of similar sailboats
- Deep fin-keel version limited to major marinas
- Comfort Ratio better than only 42% of similar designs
