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Block Island 40 Migrator
Designer: William Tripp Jr.  ·  Builder: Migrator Yachts, Inc.  ·  First built: 1984
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About the Block Island 40 Migrator

Designed for serious coastal and offshore cruising, this 40-foot sailboat represents the evolution of the popular Block Island 40 platform with enhanced long-distance capabilities. The Migrator variant was specifically developed to address the needs of cruisers planning extended passages and live-aboard adventures. Built with a robust fiberglass construction and moderate displacement hull, the Migrator emphasizes seaworthiness and comfort over racing performance. Her traditional lines feature a full keel configuration that provides excellent tracking and stability in challenging conditions, making her particularly well-suited for ocean crossings and extended coastal cruising. The cockpit and deck layout prioritize safety and ease of handling, with well-positioned winches and logical sail control systems that can be managed by a small crew. Below decks, the Migrator offers a practical interior arrangement optimized for long-term living aboard, with generous storage throughout and systems designed for self-sufficiency. While not as common as some production cruisers, the Block Island 40 Migrator has earned respect among serious cruising sailors for its solid construction and reliable performance in varied conditions. Her reputation centers on being a dependable passage-maker that doesn't sacrifice comfort for capability.

Core Dimensions
LOA (Length Overall) 40.75 ft / 12.42 m
LWL (Waterline Length) 28.00 ft / 8.53 m
Beam 11.00 ft / 3.35 m
Max Draft 8.82 ft / 2.69 m
Min Draft 4.17 ft / 1.27 m
Displacement 20,000.00 lb / 9,072 kg
Ballast 7,800.00 lb / 3,538 kg
Sail Area (Reported) 736.00 ft² / 68.38 m²
Design & Construction
Hull Type Keel/Cbrd.
Rigging Type Masthead Yawl
Construction FG
Designer William Tripp Jr.
Builder Migrator Yachts, Inc.
First Built 1984
Related Sailboats ["Irwin 41 Citation" · "Tartan 41" · "Caliber 40" · "J/40" · "First 405 Beneteau"]
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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
 16.04
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
 39.84
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
 1.62
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 7.09
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 0.96
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. 1.0
Rig Dimensions
I (Foretriangle Height) 46.8
J (Foretriangle Base) 15.58
P (Mainsail Luff) 39.5
E (Mainsail Foot) 15.0
SA Fore 364.57
SA Main 296.25
How It Compares

vs. Caliber 40, J/40, Tartan 41

This boat Similar boats
Dimensions
LOA
Block Island 40 Migrator ★
40.8 ft
Caliber 40
40.9 ft
J/40
40.9 ft
Tartan 41
40.6 ft
LWL
Block Island 40 Migrator ★
28.0 ft
Caliber 40
32.5 ft
J/40
35.5 ft
Tartan 41
32.7 ft
Beam
Block Island 40 Migrator ★
11.0 ft
Caliber 40
12.7 ft
J/40
13.2 ft
Tartan 41
12.3 ft
Displacement
Block Island 40 Migrator ★
20 lbs
Caliber 40
21 lbs
J/40
18 lbs
Tartan 41
17 lbs
Ballast
Block Island 40 Migrator ★
7 lbs
Caliber 40
9 lbs
J/40
7 lbs
Tartan 41
9 lbs
Sail Area
Block Island 40 Migrator ★
736 sq ft
Caliber 40
—
J/40
780 sq ft
Tartan 41
725 sq ft
Performance
PHRF Rating (lower = faster)
Block Island 40 Migrator ★
—
Caliber 40
120 s/nm
J/40
78 s/nm
Tartan 41
102 s/nm
SA / Displacement (higher = more powerful)
Block Island 40 Migrator ★
16.0
Caliber 40
—
J/40
17.1
Tartan 41
17.1
Ballast / Disp (higher = stiffer)
Block Island 40 Migrator ★
—
Caliber 40
44.0 %
J/40
41.7 %
Tartan 41
51.5 %
Comfort Ratio (higher = more comfortable offshore)
Block Island 40 Migrator ★
39.8
Caliber 40
32.4
J/40
33.6
Tartan 41
28.0
Capsize Screening (lower = safer)
Block Island 40 Migrator ★
1.62
Caliber 40
1.82
J/40
1.60
Tartan 41
1.88
Displacement / Length (lower = lighter)
Block Island 40 Migrator ★
—
Caliber 40
280
J/40
162
Tartan 41
228
Hull Speed
Block Island 40 Migrator ★
7.1 kts
Caliber 40
7.6 kts
J/40
9.6 kts
Tartan 41
7.7 kts
Speed Number (higher = faster)
Block Island 40 Migrator ★
1.0
Caliber 40
—
J/40
—
Tartan 41
2.4
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