Design and Construction
The Alc 40 has a solid-fiberglass hull and was offered with several keel alternatives, including a fin keel cast in lead. Lead has a practical advantage over iron here: because it is 44% denser, the builder can use a smaller foil, reducing wetted resistance and freeing a little speed compared with an iron keel.
The hull’s length-to-beam ratio is 3.38. She is slimmer than 58% of the designs in her peer group, which helps explain much of her offshore character. Her displacement-to-length ratio is roughly 250, placing her among light cruisers and offshore racers. The bottom has about 365 square feet of wetted surface, a moderate footprint for a boat of this length.
Rig and Handling
The Alc 40 carries a masthead sloop rig. Her reference sail plan gives a sail-area-to-displacement ratio of 15.4, rising to 18.7 with a 135% genoa. That’s enough canvas to make her lively in a breeze without leaving her overcanvased for short-handed cruising.
Sheet sizes are thoroughly documented. The jib and genoa sheets are 39.5 feet long and 9/16 inch in diameter. The mainsheet is 98.8 feet at the same diameter, while the spinnaker sheet is 87 feet long and 9/16 inch in diameter.
Her capsize screening value is 1.88, which, by that formula alone, would qualify her to enter ocean races. The Motion Comfort Ratio is 27.1, making her more comfortable than 38% of similar sailboat designs. Meanwhile, 54% of comparable designs are heavier.
Performance and Draft
The theoretical hull speed for a displacement boat of this length is 7.4 knots, while the calculated maximum speed is about 6.3 knots.
She immerses about 1,227 pounds per inch, so loading her for a cruise will noticeably change her trim and draft. With the shallow fin keel, she draws 4.59–4.89 feet, depending on load, and can enter even shallow marinas. The deeper fin option draws 5.74–6.04 feet and can still enter most marinas. These two draft ranges allow a buyer to match the boat to the intended cruising ground.
Accommodations and Power
The Alc 40 is a large sailboat, but the available material doesn’t itemize her interior or provide tankage details. That leaves buyers to assess the accommodations and livability in person.
Propulsion is flexible. She may be equipped with an inboard Westerbeke 4-107 diesel rated at 37 horsepower. Vire is also listed as the engine supplier, and diesel is the stated fuel type.
Known Issues
The only ownership-related caution is indirect. Because the Alc 40 immerses about 1,227 pounds per inch, a heavily loaded boat will sit deeper and change its documented draft ranges. A surveyor should therefore confirm the actual freeboard against the designed lines rather than relying on a specification-sheet draft.
Verdict
The Alc 40 is a thoughtfully engineered, narrow sloop that combines useful speed with offshore credibility. Her lead fin-keel option, documented sheet specifications, and choice of two draft ranges make her a versatile used racer-cruiser. Her Motion Comfort Ratio, however, is better than only 38% of similar designs, and the limited accommodation record means a buyer will need to verify livability in person.
Pros
- Lead fin-keel option reduces wetted resistance compared with iron
- Capsize screening value of 1.88 meets the ocean-race formula threshold
- Two draft ranges—4.59–4.89 feet and 5.74–6.04 feet—suit varied cruising grounds
- Masthead rig with a 135% genoa raises SA/D to 18.7
Cons
- Motion Comfort Ratio is better than only 38% of peers
- An immersion rate of 1,227 pounds per inch means added load noticeably changes draft
- No interior or tankage details are provided in the available material
