Design and Construction
The Tripp 47's hull is fiberglass, and she carries a fin keel with bulb executed in lead. At a beam of 13.67 feet against a 47-foot length overall, her length-to-beam ratio is 3.43 — a narrow, purposeful section that favors stability and tracking over interior volume. The 9,500 pounds of lead ballast against an 18,800-pound displacement yields the 51 percent ballast ratio, a figure the recorded data ranks higher than 98 percent of all similar sailboat designs. That density low in the hull, paired with the light-racer DL category, explains much of her behavior under sail even before the rig is considered. Her wet-bottom surface of about 656 square feet and immersion rate of 1,848 pounds per inch round out a picture of a boat that sits firmly and responds predictably to loading.
Rig and Handling
The boat was offered with more than one rig, specifically a fractional rig and a masthead rig, and the documented control lengths differ between them in ways that matter to anyone re-running wire. On the fractional setup the mainsail, jib/genoa, and spinnaker halyards each run 48.1 meters in 14 mm diameter, while the masthead rig shortens those to 43.8 meters in the same diameter. Sheet geometry is shared: jib and genoa sheets are 14.3 meters in 16 mm, mainsheet 35.8 meters in 16 mm, spinnaker sheet 31.5 meters in 16 mm. The sail-area-to-displacement ratio is 26.7 with the ISO 8666 reference sail and 30.3 with a 135 percent genua, and that ratio is recorded as making her faster than 100% of all similar sailboat designs in light wind. Yet the same source notes she carries more rig than only 42 percent of similar boats, which labels her slightly underrigged — a tension between light-air acceleration and overall canvas that any prospective owner should weigh against intended waters.
Performance Profile
The theoretical maximal speed of a displacement hull her length is 8.3 knots, with a calculated max near 7.3 knots, and the capsize screening value is 2.06. That screening figure is not a rounding error: it is the documented threshold that indicates this boat would not be accepted to participate in ocean races. Her Motion Comfort Ratio is 21.4, a number the data places above just 10 percent of similar designs — quantifiably firm rather than soft in a seaway, despite the light-racer label. The 2.06 capsize value and the 21.4 comfort figure together argue for coastal and offshore cruising within sensible limits rather than regulated ocean racing.
Accommodations and Draft Reality
A load-dependent draft of roughly 8.99 to 9.29 feet is the defining constraint below the waterline. The documented note is blunt: the Tripp 47 can only enter major marinas at that draft dependent on load. For a 47-footer with a 100-gallon water and 50-gallon diesel capacity, that keel depth trades universal port access for the righting moment that underwrites the ballast story above. Owners prioritizing quiet anchorages over shallow gunkholing will find the trade rational; those needing universal marina reach will not.
Known Issues and Limits
The sharpest caveat is the capsize screening value of 2.06 and its direct consequence for sanctioned ocean racing, already noted. Beyond that, the only other documented limitation is draft-driven marina access. The source material records no defect history, so the risk profile rests on geometry and rating.
The Verdict
The Tripp 47 is a narrowly proportioned, lead-ballasted light racer whose documented numbers — 51 percent ballast ratio, 2.06 capsize screen, 21.4 comfort ratio, SA/D up to 30.3 — describe a boat built for speed in light air and steadiness in a breeze, constrained by a deep bulb keel and barred from formal ocean racing by screening rules. She rewards the sailor who values quantified performance over marina convenience.
Pros
- Ballast ratio of 51 percent, higher than 98 percent of similar designs
- SA/D up to 30.3 with 135% genua; faster than 100% of similar boats in light wind
- Motion Comfort Ratio of 21.4, firmer than most similar designs
- Offered in fractional and masthead rig configurations
Cons
- Capsize screening value of 2.06 excludes her from ocean races
- Load-dependent draft of ~9–9.3 ft limits her to major marinas
- Slightly underrigged relative to 58 percent of similar sailboats
- Comfort ratio above only 10 percent of similar designs
