Design and Construction
The Nicholson 40 AC is a solid fiberglass hull with lead ballast and a fin keel, a skeg-hung rudder, and a ketch rig. At 40 feet overall with an 11.5-foot beam her length-to-beam ratio is 3.47. The displacement-to-length ratio of 384 makes her an ultra-heavy cruiser, and at 24,416 pounds with 1,224 pounds per inch of immersion she sits stubbornly in the water. Her capsize screening value of 1.59 and motion comfort ratio of 43.3 mark a stable, forgiving sea boat anchor.
Rig and Handling
The ketch carries a 100-foot mainsheet and 40-foot jib and genoa sheets, all 14 millimeters. With a sail-area-to-displacement ratio of 17.87 she is modestly canvased for a 24,000-pound hull. The theoretical hull speed is 7.4 knots on a 30.5-foot waterline, and the fin keel draws 5.74 to 6.04 feet by load, letting her into most marinas anchor. The wetted surface is about 398 square feet.
Accommodations and Intended Use
The aft-cockpit layout and ultra-heavy cruiser rating point to a liveaboard offshore vessel. The ketch rig splits the sail plan for shorthanded crews.
Known Issues
The hull and rig of the Nicholson 40 AC show no structural defects, osmotic blistering, rigging failures, or systemic faults in available accounts.
Refits and Ownership
With only a few hulls built from 1978 onward, every surviving example is a low-volume keeper yacht. The simple ketch rig means refits tend to systems and canvas.
The Verdict
A traditional heavy-displacement ketch cruiser from the late-1970s British school — limited in numbers, honest in construction, styled for ocean passage.
Pros
- Ultra-heavy cruiser displacement and 1.59 capsize screening mark a stable offshore hull
- Solid fiberglass construction with lead ballast and fin keel
- Ketch rig splits sail handling for shorthanded crews
- 65-gallon fuel and 85-gallon water support long passages
Cons
- 17.87 sail-area-to-displacement ratio is modest; needs wind to move well
- 5.74–6.04 foot draft limits shallow anchoring
- Only a few built, so spares and knowledge base are thin
