Design and Construction
The Bianca 36 carries a length-to-beam ratio of 3.41 and a displacement-to-length index of 369, which places her firmly among what the design data calls "ultra heavy cruisers" anchor. Her ballast ratio is 43 percent, and the iron fin keel draws between six and 6.3 feet depending on load, meaning she needs the deeper visitors' berths at major marinas rather than the shallow end of the fuel dock. The hull itself is solid fiberglass with a wetted surface of roughly 312 square feet, and each inch of sinkage demands about 894 pounds of added load, a figure that speaks to a volume that does not perk up lightly when stores are added. A capsize screening value of 1.68 and a motion comfort ratio near 34.4 suggest a stable, damped motion profile in a seaway rather than a lively one.
Rig and Handling
She is built with a masthead sloop rig, and the numbers tell a candid story about her sail plan. The sail-area-to-displacement ratio is 14.3 on the ISO reference sail and 17.2 with a 135 percent genoa, while the rig comparison puts her with more sail than only 24 percent of similar boats — a clear signal that she is significantly underrigged, as yachtdatabase.com's review found anchor. The theoretical hull speed is 6.8 knots, yet the calculated maximum is about 5.1, and the relative speed performance index reads 54; together these describe a boat that prefers to be kept moving with a full genoa than to be hurried under main alone. The halyard and sheet dimensions are worth noting for any re-rig: mainsail, jib, and spinnaker halyards all run about 101.8 feet at 3/8 inch, while the genoa and mainsheets are 34.3 and 85.8 feet respectively at half-inch diameter.
Accommodations
Below, the Bianca 36 is equipped with six berths along with a galley and a toilet facility. The arrangement serves a family or a crewed passage plan rather than a minimalist solo layout, and the berth count is consistent with her heavy-cruiser brief: space was allotted to living aboard and to sea-keeping, not stripped for the race course.
The Verdict
The Bianca 36 is a thoughtfully proportioned heavy-displacement cruiser from the Sparkman & Stephens board, built by a Danish yard at the height of its fiberglass transition. She is stable and commodious, but her underrigged sail plan means the prudent owner carries and uses a genoa. She is a known quantity in the used market under two names, and her limits are clear from her design numbers.
Pros
- Iron fin keel and 43 percent ballast ratio give a reassuring motion comfort index near 34.4
- Six berths with galley and head suit extended cruising or family use
- Solid fiberglass hull from a recognized Danish builder
Cons
- Significantly underrigged for her displacement; needs a genoa to perform
- Six-foot-plus draft limits marina access to deeper berths
- Calculated top speed near 5.1 knots trails her theoretical hull speed
