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Seafarer 31 Mkii
Designer: Mccurdy And Rhodes  ·  Builder: Seafarer Yachts (Usa)  ·  First built: 1974
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About the Seafarer 31 Mkii

A capable and dependable cruising sailboat, the Seafarer 31 Mkii represents a refined evolution of the original Seafarer 31 design, offering sailors a well-rounded platform suited to coastal and nearshore cruising. The Mkii designation suggests meaningful improvements over its predecessor, typically reflecting refinements in hull form, interior layout, or deck hardware that respond to real-world feedback from owners and sailors. Seafarer yachts built a solid reputation during the golden era of American fiberglass production sailing, earning respect among budget-conscious cruisers who valued seaworthiness and practicality over flash. The 31 Mkii carries that tradition forward, appealing to sailors looking for a manageable, trailerable-sized vessel that can handle weekend coastal passages with confidence while remaining accessible to a single-hander or small crew. With limited specifications readily available, prospective buyers are encouraged to seek out existing owner communities and inspection reports, as firsthand accounts often reveal the most useful insights into this model's particular strengths and quirks. Overall, the Seafarer 31 Mkii remains an approachable and honest cruising sailboat worth serious consideration for those entering bluewater-adjacent sailing on a practical budget.

Core Dimensions
LOA (Length Overall) 31.00 ft / 9.45 m
LWL (Waterline Length) 25.08 ft / 7.64 m
Beam 9.75 ft / 2.97 m
Max Draft 5.25 ft / 1.60 m
Displacement 10,300.00 lb / 4,672 kg
Ballast 4,850.00 lb / 2,200 kg
Ballast Type Lead
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG/balsa cored deck
Designer McCurdy and Rhodes
Builder Seafarer Yachts (USA)
First Built 1974
Owner Reviews

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Known Issues & What to Watch For

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Performance Ratios
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
47.09
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
291.48
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 5.24 pounds/inch
Rig Dimensions
I (Foretriangle Height) 15.43
J (Foretriangle Base) 13.25 ft / 4.04 m
P (Mainsail Luff) 455.00 ft² / 42.27 m²
E (Mainsail Foot) Universal
Engine & Accommodations
Horsepower 30
Fuel Capacity 20 gals / 76 L
Water Capacity 45 gals / 170 L
How It Compares

vs. Bristol 311, Island Packet 31, Longbow 31 Westerly

This boat Similar boats
Dimensions
LOA
Seafarer 31 Mkii ★
31.0 ft
Bristol 311
31.0 ft
Island Packet 31
31.0 ft
Longbow 31 Westerly
31.0 ft
LWL
Seafarer 31 Mkii ★
25.1 ft
Bristol 311
24.8 ft
Island Packet 31
27.8 ft
Longbow 31 Westerly
25.0 ft
Beam
Seafarer 31 Mkii ★
9.8 ft
Bristol 311
10.2 ft
Island Packet 31
11.6 ft
Longbow 31 Westerly
9.5 ft
Displacement
Seafarer 31 Mkii ★
10 lbs
Bristol 311
11 lbs
Island Packet 31
11 lbs
Longbow 31 Westerly
9 lbs
Ballast
Seafarer 31 Mkii ★
4 lbs
Bristol 311
4 lbs
Island Packet 31
4 lbs
Longbow 31 Westerly
4 lbs
Sail Area
Seafarer 31 Mkii ★
Bristol 311
455 sq ft
Island Packet 31
530 sq ft
Longbow 31 Westerly
371 sq ft
Performance
SA / Displacement (higher = more powerful)
Seafarer 31 Mkii ★
Bristol 311
14.6
Island Packet 31
17.2
Longbow 31 Westerly
13.4
Ballast / Disp (higher = stiffer)
Seafarer 31 Mkii ★
47.1 %
Bristol 311
40.2 %
Island Packet 31
40.9 %
Longbow 31 Westerly
Comfort Ratio (higher = more comfortable offshore)
Seafarer 31 Mkii ★
Bristol 311
29.6
Island Packet 31
22.6
Longbow 31 Westerly
27.0
Capsize Screening (lower = safer)
Seafarer 31 Mkii ★
Bristol 311
1.82
Island Packet 31
2.09
Longbow 31 Westerly
1.80
Displacement / Length (lower = lighter)
Seafarer 31 Mkii ★
291
Bristol 311
329
Island Packet 31
229
Longbow 31 Westerly
Hull Speed
Seafarer 31 Mkii ★
Bristol 311
6.7 kts
Island Packet 31
7.1 kts
Longbow 31 Westerly
6.7 kts
Speed Number (higher = faster)
Seafarer 31 Mkii ★
Bristol 311
1.4
Island Packet 31
2.4
Longbow 31 Westerly
1.7
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