Design and Construction
Both hull and deck are solid fiberglass, and the boat was also offered as a home-completion shell, so finished quality varies from one example to the next. The keel is iron, and loaded draft runs about 5.74 to 6.04 feet depending on burden, which keeps her within the draft envelope of most marina approaches. With a beam of just over ten feet and a length-to-beam ratio of 3.03, she is a moderately proportioned 31-footer; the ballast ratio of 42 percent and the published capsize screening of 2.02 means she would not qualify for ocean racing under that metric. Her displacement-length ratio of 198 places her among "moderate racers," and the motion comfort ratio of 17.5 to 21.0 describes a settled sea manner for a boat of this size.
Rig and Handling
The UFO 31 carries a masthead rig, and the review notes she has more rig than only 42 percent of comparable sailboats, marking her as slightly underrigged for her type. With the ISO 8666 reference sail the sail-area-to-displacement ratio is 15.5, rising to 18.7 with a 135 percent genoa, so reaching performance depends heavily on carrying the larger headsail. The theoretical displacement hull speed is 6.8 knots, and the relative speed performance index is 38. Standing and running rigging dimensions are fully specified: halyards for main, genoa, and spinnaker each run 90.6 feet at 3/8 inch, sheets for genoa and jib are 30.8 feet at 1/2 inch, and the mainsheet is 77.1 feet at 1/2 inch. The wetted surface is about 301 square feet, and the immersion rate of 908 pounds per inch tells the owner how firmly she sits with added load.
Accommodations
No interior arrangement, berth count, or joiner detail is published for the UFO 31, and the home-completion route means the finished cabin plan could differ from one boat to another. What can be stated is the external envelope that bounds any layout: just over 25 feet of waterline inside a 30-foot-10-inch overall length, a 10-foot beam, and a fin keel. Buyers comparing her to sisters in the UFO line should note the design came from Holman & Pye's mid-1970s practice rather than the later Italian Felci-designed sportboat UFOs that share only a name.
The Verdict
The UFO 31 is a modestly powered, moderately racer-flavored cruiser-racer from the mid-1970s British fiberglass tradition, with a known and useful set of rig dimensions and stability figures but an uneven finish pedigree due to the home-completion option. She is best understood as a straightforward solid-glass Holman & Pye design of her era rather than a bluewater-certified offshore racer.
Pros
- Solid fiberglass hull and deck by Colvic Craft
- Moderate racer profile with documented stability and comfort ratios
- Draft low enough for most marina access
- Fully specified rigging lengths and diameters for easy renewal
Cons
- Slightly underrigged relative to peers
- Capsize screening excludes ocean-race eligibility
- Home-completion history means variable build quality
