Design and Construction
The hull and deck are fiberglass, while the interior is finished in teak, as were many contemporary cruisers. The keel is iron rather than lead, reflecting a particular construction tradition for a boat of this size.
The Nauticat 52 has a moderate beam-to-length ratio of 3.39. Her recorded ballast is 15,200 pounds against a displacement of 56,000 pounds, giving a ballast ratio of 31 percent. The underwater body has about 667 square feet of wetted surface.
Her immersion rate is roughly 2,088 pounds per inch. Combined with that large wetted surface, it helps explain why she settles heavily under load and why her draft varies from 7.22 to 7.52 feet depending on what she carries. That draft limits her to major marinas.
Rig, Power, and Handling
The Nauticat 52 carries a ketch rig, dividing the sail plan into more manageable sections for a hull of this size.
Under power, she reaches 10.0 knots with her Ford engine, although the theoretical hull speed for a displacement vessel of this length is 8.4 knots. Those figures mark the distinction between what the propeller can drive and the speed suggested by displacement-hull theory.
Her capsize screening value is 1.61, a figure used to argue that she could be accepted under that formula’s test before the quoted passage was cut. The Motion Comfort Ratio is 50.6, consistent with the easy motion expected from a heavily ballasted cruiser.
Accommodations
Below deck, the 15-foot beam and long hull provide substantial interior volume. Teak joinery gives the accommodation the traditional character found aboard many boats of the era and places her among traditional Finnish-built cruisers rather than spartan racer-cruisers.
The layout is intended for liveaboard and long-passage use, with the volume implied by a 51.16-foot hull and an ultra-heavy-cruiser designation.
Verdict
The Nauticat 52 is a purpose-built heavy motorsailer drawn by Sparkman & Stephens and produced by Siltala Yachts. She combines a fiberglass hull, iron keel, ketch rig, substantial displacement, and a teak-finished interior.
She is a load-sensitive passage boat whose draft restricts her marina choices. Her documented ratios place her firmly among ultra-heavy cruisers, while her Motion Comfort Ratio and capsize screening value suit her offshore intentions.
Pros
- Large, teak-finished interior within a 15-foot beam and 51.16-foot hull
- Ultra-heavy-displacement hull, with a D/L ratio of 378, for stable motion
- Ketch rig divides the sail area into more manageable sections
- Documented powered speed of 10.0 knots with the Ford engine
Cons
- Draft of 7.22–7.52 feet restricts her to major marinas
- Immersion rate of 2,088 pounds per inch indicates heavy load sensitivity
- Iron rather than lead keel, for buyers weighing ballast material
