Design and Construction
The Halcyon 27 measures 27 feet overall, with a 20.25-foot waterline. She displaces 6,720 pounds and carries 3,000 pounds of iron ballast, giving her a ballast ratio of 45%. Her displacement-length ratio of 356 places her firmly in the heavy-cruiser class for her length, while a length-to-beam ratio of 3.57 confirms her relatively narrow hull form.
The hull and deck are both solid fiberglass. Her full long keel draws about 4.00–4.30 ft, depending on load, enough to let her tuck into shallow marinas.
Wetted bottom area is near 172 square feet, and the immersion rate is about 535 pounds per inch. Those figures point to a hull that sits heavily and may respond reluctantly when overloaded, but holds its trim in a seaway.
Rig and Handling
The Halcyon 27 has a masthead sloop rig and a modest sail-area/displacement ratio of 13.03. The source specifies a 67-foot mainsheet, 27-foot jib and genoa sheets, and a 59-foot spinnaker sheet, all 3/8-inch in diameter. These lengths suit a conventional sloop of this size with control lines led to the cockpit.
Under power, the Wickström engine gives a calculated maximum speed of about 3.4 knots, while a Saab installation is listed at 4.5 knots. The boat’s theoretical displacement hull speed is 6.0 knots.
A capsize screening value of 1.60 and Motion Comfort Ratio of 31.3 describe a stable, damped motion profile rather than the livelier behavior of a racer.
Accommodations and Cruising Role
Below, the Halcyon 27 has two cabins and four berths, a simple layout consistent with a small family cruiser of the period. That accommodation count is documented rather than inferred.
Together, the 45% ballast ratio and heavy-cruiser classification support a boat intended for settled coastal and modest offshore use rather than regatta sailing.
The Verdict
The Halcyon 27 is a traditional, heavy-displacement, long-keel cruiser built to Alan Buchanan’s conservative design. She offers stable motion and a draft shallow enough for marina access, but she is slow under her documented auxiliary power and built to an older specification than modern 27-footers.
Pros
- Full long keel with 4.0–4.3 ft draft, providing shallow access and tracking
- Heavy-cruiser displacement and 45% ballast ratio for stable motion
- Two cabins and four berths in a simple cruising layout
Cons
- Calculated maximum speed of only about 3.4 knots with the Wickström engine
- High immersion rate means she sits heavily when loaded
- Masthead sloop rig on a narrow hull, with a modest sail-area/displacement ratio of 13.03
