Design and Construction
Trident Marine built the Seaforth 36 with a solid fiberglass hull and solid deck, avoiding the saturation risks associated with cored panels. Her solid fiberglass hull and bilge keels give a loaded draft of 3.74 to 4.04 feet, allowing access to shallow marinas and drying moorings that a deeper 36-footer cannot use.
She carries 4,480 pounds of iron ballast against a displacement of 13,440 pounds, for a ballast ratio of 33 percent. Her 11.16-foot beam and 29-foot waterline produce a length-to-beam ratio of 3.23. Wetted surface is 322 square feet, while an immersion rate of 1,127 pounds per inch means she trims slowly and rewards careful loading.
Rig and Handling
The ketch rig uses a 90-foot mainsheet and a 36-foot genoa sheet, both 14 mm, along with a 79-foot spinnaker sheet.
A sail-area-to-displacement ratio of 12.02 and a displacement-length ratio of 246 point to a predictable sea boat with no pretensions to the race course. Theoretical hull speed is 7.2 knots, while the capsize screening value is 1.88. Her Motion Comfort Ratio of 26.7 further marks her as a steady cruiser rather than a racer.
Accommodations
The 11.16-foot beam and shoal bilge keels leave the cabin floor largely unobstructed. A three-cabin cruising layout, typical of the period, fits within the hull volume without intrusion from a centreboard trunk.
Known Issues
The iron ballast in the bilge keels will rust if water is allowed to stand in the bilge. Otherwise, the solid fiberglass hull and deck show no structural defects or rigging failures across the class.
The Verdict
The Seaforth 36 is a pragmatic shoal-draft cruiser. She trades sprint speed for shallow-water access and steadiness under a split ketch rig.
Pros
- Bilge keels provide a draft of 3.74–4.04 feet for shallow-water access
- Solid fiberglass hull and deck avoid cored-panel saturation
- A 26.7 comfort ratio and 33% ballast ratio favour settled cruising
Cons
- A displacement-length ratio of 246 limits light-air acceleration
- Iron ballast in the bilge keels requires vigilance to keep the bilge dry
