Design and Construction
Peterson’s late-1970s lines gave the Formosa 46 a length-to-beam ratio of 3.56. Her ballast ratio is 30 percent, with roughly 10,000 pounds of lead in a boat displacing 33,000 pounds.
The yard assembled the solid-fiberglass hull, separate deck, and separate cabin house in a three-piece joint. Below the waterline, the hull is solid fiberglass without core material, while the deck follows the marque’s sandwich construction practice and is overlaid with teak.
Depending on load, the fin keel draws between 6.46 and 6.76 feet, restricting the boat to major marinas. Wetted surface is about 570 square feet. The hefty immersion rate of 1,782 pounds per inch indicates that the boat settles relatively little as the lockers are loaded for a passage.
Rig, Performance, and Handling
The Formosa 46 has a sail-area-to-displacement ratio of 15.90 and a displacement-length ratio of 230. The rating system categorizes the boat as a “moderate racer”, rather than a heavy cruiser. Her theoretical hull speed is 8.4 knots.
Standing and running rigging dimensions are well documented. Jib and genoa sheets are about 46 feet long and 5/8 inch in diameter. The mainsheet is a 115-foot line of the same diameter, while the spinnaker sheet stretches 101 feet. Those lengths point to a large foretriangle and a boom that demands careful mainsheet management.
The capsize screening value is 1.63, which, by that formula alone, would admit her to offshore events. Her Motion Comfort Ratio is 39.1—moderate rather than plush.
Accommodations and Cruising Footprint
With a length of 45 feet and a beam of 12.92 feet, the Formosa 46 has the footprint of a sizable cruiser. Her 30-percent ballast ratio and 33,000-pound displacement imply a stiff, settled platform rather than a featherweight weekender.
The Verdict
On paper, the Formosa 46 is a study in contrasts: a Taiwan-built Peterson design with racer-derived ratios wrapped around cruiser-scale displacement and beam. By the numbers, she has a serious, offshore-capable hull, but her draft limits her to deep-water marinas, and her comfort ratio falls in the middle of the range rather than at the softer end.
For a buyer seeking Peterson’s late-1970s performance thinking in a 45-foot fiberglass hull, the Formosa 46 is a distinctive and defensible choice.
Pros
- A documented capsize screening value of 1.63 and Motion Comfort Ratio of 39.1 indicate offshore-suitable stability.
- Moderate-racer D/L and SA/D ratios suggest livelier handling than that of typical Taiwan cruisers.
- Solid-fiberglass hull below the waterline, with separate hull, deck, and cabin-house construction.
Cons
- Draft of 6.46–6.76 feet restricts access to major marinas.
- An immersion rate of 1,782 lbs/inch reflects a heavy platform with limited load tolerance before it sits deep.
