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Island Trader 41
Designer: William Garden  ·  Builder: Transworld Boat Building Co. (Taiwan)  ·  First built: 1976
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About the Island Trader 41

William Garden's Island Trader 41 represents classic cruising yacht design from the mid-1970s era, embodying the traditional values of seaworthiness and comfort over speed. Built by Transworld Boat Building Co. in Taiwan starting in 1976, this fiberglass cruiser features a distinctive staysail ketch rig and full long keel configuration that prioritizes stability and tracking ability. The yacht's substantial 29,000-pound displacement and generous beam of 12 feet create impressive interior volume while contributing to a remarkably high comfort ratio of 47.5, making her exceptionally well-suited for extended offshore passages and liveaboard cruising. The long keel design, while sacrificing some maneuverability in tight quarters, provides excellent directional stability and the ability to take ground safely in tidal areas. Garden's design philosophy emphasized seakindliness over performance, and the Island Trader 41 delivers accordingly with moderate sail area and conservative proportions. The staysail ketch rig offers versatility in heavy weather, allowing crews to balance the boat effectively under various sail combinations. Her capsize screening formula of 1.57 falls within acceptable offshore parameters, though her design clearly favors comfort and load-carrying capacity over racing potential. This makes her an attractive choice for serious cruising couples seeking a traditional, well-mannered passage maker.

Core Dimensions
LOA (Length Overall) 40.25 ft / 12.27 m
LWL (Waterline Length) 32.00 ft / 9.75 m
Beam 12.00 ft / 3.66 m
Max Draft 6.00 ft / 1.83 m
Displacement 29,000.00 lb / 13,154 kg
Ballast 9,000.00 lb / 4,082 kg
Ballast Type Iron
Sail Area (Reported) 810.00 ft² / 75.25 m²
Design & Construction
Hull Type Long Keel
Rigging Type Staysail Ketch
Construction FG
Designer William Garden
Builder Transworld Boat Building Co. (TAIWAN)
First Built 1976
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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
198
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
13.79
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
31.03
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
395.09
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
47.5
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
1.57
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. 7.58 kn
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. 1,372.07 pounds/inch
Engine & Accommodations
Engine Make Perkins
Engine Model 4-108
Engine Type Diesel
Horsepower 50
Fuel Capacity 60 gals / 227 L
Water Capacity 100 gals / 379 L
How It Compares

vs. Bristol 40, Cape Dory 40, Gulfstar 40 Hood, Mariner 40 Garden, Morgan 40 Cruising Ketch

This boat Similar boats
Dimensions
LOA
Island Trader 41 ★
40.3 ft
Bristol 40
40.2 ft
Cape Dory 40
40.2 ft
Gulfstar 40 Hood
40.2 ft
Mariner 40 Garden
40.3 ft
Morgan 40 Cruising Ketch
40.2 ft
LWL
Island Trader 41 ★
32.0 ft
Bristol 40
27.5 ft
Cape Dory 40
30.0 ft
Gulfstar 40 Hood
32.3 ft
Mariner 40 Garden
30.2 ft
Morgan 40 Cruising Ketch
30.0 ft
Beam
Island Trader 41 ★
12.0 ft
Bristol 40
10.8 ft
Cape Dory 40
11.7 ft
Gulfstar 40 Hood
11.3 ft
Mariner 40 Garden
11.4 ft
Morgan 40 Cruising Ketch
11.3 ft
Displacement
Island Trader 41 ★
29 lbs
Bristol 40
17 lbs
Cape Dory 40
19 lbs
Gulfstar 40 Hood
24 lbs
Mariner 40 Garden
26 lbs
Morgan 40 Cruising Ketch
21 lbs
Ballast
Island Trader 41 ★
9 lbs
Bristol 40
6 lbs
Cape Dory 40
Gulfstar 40 Hood
12 lbs
Mariner 40 Garden
9 lbs
Morgan 40 Cruising Ketch
8 lbs
Sail Area
Island Trader 41 ★
810 sq ft
Bristol 40
694 sq ft
Cape Dory 40
778 sq ft
Gulfstar 40 Hood
766 sq ft
Mariner 40 Garden
733 sq ft
Morgan 40 Cruising Ketch
700 sq ft
Performance
PHRF Rating (lower = faster)
Island Trader 41 ★
198 s/nm
Bristol 40
132 s/nm
Cape Dory 40
120 s/nm
Gulfstar 40 Hood
113 s/nm
Mariner 40 Garden
Morgan 40 Cruising Ketch
SA / Displacement (higher = more powerful)
Island Trader 41 ★
13.8
Bristol 40
16.5
Cape Dory 40
17.3
Gulfstar 40 Hood
14.8
Mariner 40 Garden
13.3
Morgan 40 Cruising Ketch
14.8
Comfort Ratio (higher = more comfortable offshore)
Island Trader 41 ★
47.5
Bristol 40
36.7
Cape Dory 40
34.6
Gulfstar 40 Hood
42.2
Mariner 40 Garden
48.1
Morgan 40 Cruising Ketch
39.1
Capsize Screening (lower = safer)
Island Trader 41 ★
1.57
Bristol 40
1.66
Cape Dory 40
1.74
Gulfstar 40 Hood
1.57
Mariner 40 Garden
1.54
Morgan 40 Cruising Ketch
1.63
Displacement / Length (lower = lighter)
Island Trader 41 ★
395
Bristol 40
Cape Dory 40
322
Gulfstar 40 Hood
Mariner 40 Garden
Morgan 40 Cruising Ketch
Hull Speed
Island Trader 41 ★
7.6 kts
Bristol 40
7.0 kts
Cape Dory 40
7.3 kts
Gulfstar 40 Hood
7.6 kts
Mariner 40 Garden
7.4 kts
Morgan 40 Cruising Ketch
7.3 kts
Speed Number (higher = faster)
Island Trader 41 ★
Bristol 40
1.2
Cape Dory 40
1.6
Gulfstar 40 Hood
1.5
Mariner 40 Garden
0.8
Morgan 40 Cruising Ketch
1.2
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