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Ocean 40 Mull
Designer: Gary Mull  ·  Builder: Kyung-Il Yachts (Korea)  ·  First built: 1979
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About the Ocean 40 Mull

Designed for serious offshore and bluewater cruising, the Ocean 40 Mull is a performance-oriented sailboat that reflects the enduring design philosophy of Gary Mull, a respected American naval architect known for producing fast, well-balanced hulls. Mull built a strong reputation throughout the 1970s and 1980s for designs that struck an appealing balance between racing competitiveness and genuine offshore capability, and the Ocean 40 carries that legacy forward. With a hull shaped to move efficiently through a range of sea conditions, this boat tends to attract sailors who want more than a comfortable coastal cruiser — those who are drawn to longer passages and open water challenges. Mull's designs typically feature clean, purposeful lines with an emphasis on upwind performance without sacrificing sea-kindly behavior in rougher conditions. While detailed specifications for this particular model are limited, the Ocean 40 Mull is generally regarded as a capable and rewarding boat to sail. Prospective buyers would benefit from a thorough survey and hands-on sea trial to fully appreciate her character and confirm she suits their specific cruising ambitions.

Core Dimensions
LOA (Length Overall) 40.00 ft / 12.19 m
LWL (Waterline Length) 31.83 ft / 9.70 m
Beam 12.75 ft / 3.89 m
Max Draft 7.00 ft / 2.13 m
Displacement 19,000.00 lb / 8,618 kg
Ballast 9,100.00 lb / 4,128 kg
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Gary Mull
Builder Kyung-Il Yachts (KOREA)
First Built 1979
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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
47.89
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
263.02
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. 8.7 pounds/inch
Rig Dimensions
I (Foretriangle Height) 17.35
J (Foretriangle Base) 17.20 ft / 5.24 m
P (Mainsail Luff) 769.00 ft² / 71.44 m²
E (Mainsail Foot) 263.02
How It Compares

vs. Intrepid 40, Lancer 40, Tartan 40 Offshore

This boat Similar boats
Dimensions
LOA
Ocean 40 Mull ★
40.0 ft
Intrepid 40
40.0 ft
Lancer 40
40.0 ft
Tartan 40 Offshore
40.0 ft
LWL
Ocean 40 Mull ★
31.8 ft
Intrepid 40
32.8 ft
Lancer 40
33.7 ft
Tartan 40 Offshore
36.0 ft
Beam
Ocean 40 Mull ★
12.8 ft
Intrepid 40
12.6 ft
Lancer 40
12.0 ft
Tartan 40 Offshore
13.3 ft
Displacement
Ocean 40 Mull ★
19 lbs
Intrepid 40
20 lbs
Lancer 40
15 lbs
Tartan 40 Offshore
26 lbs
Ballast
Ocean 40 Mull ★
9 lbs
Intrepid 40
7 lbs
Lancer 40
4 lbs
Tartan 40 Offshore
10 lbs
Sail Area
Ocean 40 Mull ★
Intrepid 40
749 sq ft
Lancer 40
689 sq ft
Tartan 40 Offshore
788 sq ft
Performance
SA / Displacement (higher = more powerful)
Ocean 40 Mull ★
Intrepid 40
16.3
Lancer 40
17.8
Tartan 40 Offshore
14.4
Comfort Ratio (higher = more comfortable offshore)
Ocean 40 Mull ★
Intrepid 40
30.5
Lancer 40
24.6
Tartan 40 Offshore
34.3
Capsize Screening (lower = safer)
Ocean 40 Mull ★
Intrepid 40
1.86
Lancer 40
1.93
Tartan 40 Offshore
1.80
Hull Speed
Ocean 40 Mull ★
Intrepid 40
7.7 kts
Lancer 40
7.8 kts
Tartan 40 Offshore
8.0 kts
Speed Number (higher = faster)
Ocean 40 Mull ★
Intrepid 40
2.1
Lancer 40
3.0
Tartan 40 Offshore
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