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Sea Tiger 41
Designer: William Garden  ·  Builder: Formosa Yachts  ·  First built: 1974
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About the Sea Tiger 41

Designed by renowned naval architect William Garden and built by Taiwan's Formosa Yachts starting in 1974, this substantial cruising sailboat exemplifies the era's emphasis on seaworthiness and comfort over speed. The masthead sloop rig configuration and traditional long keel design create a stable, predictable sailing platform that inspires confidence in challenging conditions. With a displacement of 28,000 pounds and a comfort ratio of 42.96, this yacht prioritizes offshore capability and crew comfort during extended passages. The long keel provides excellent directional stability and protects the rudder, though it sacrifices some maneuverability in tight quarters. The capsize screening formula of 1.58 indicates good stability characteristics suitable for ocean voyaging. Garden's design philosophy shines through in the boat's conservative proportions and robust construction. The fiberglass hull construction by Formosa Yachts, known for their solid craftsmanship during this period, has proven durable over decades. While the sail area to displacement ratio of 13.4 suggests moderate performance in light air, the design excels in heavier weather where its substantial build and forgiving handling characteristics become valuable assets. This yacht appeals to serious cruising sailors seeking a proven offshore platform with traditional sailing qualities and the security that comes with William Garden's respected design heritage.

Core Dimensions
LOA (Length Overall) 41.00 ft / 12.50 m
LWL (Waterline Length) 35.00 ft / 10.67 m
Beam 12.00 ft / 3.66 m
Max Draft 6.20 ft / 1.89 m
Displacement 28,000.00 lb / 12,701 kg
Sail Area (Reported) 769.00 ft² / 71.44 m²
Design & Construction
Hull Type Long Keel
Rigging Type Masthead Sloop
Construction FG
Designer William Garden
Builder Formosa Yachts
First Built 1974
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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
 216
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
 13.4
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
 291.55
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
 42.96
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
 1.58
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. 7.93 kn
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
 1.5
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. 1,500.71 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 13.39
Rig Dimensions
I (Foretriangle Height) 49.90 ft / 15.21 m
J (Foretriangle Base) 17.50 ft / 5.33 m
P (Mainsail Luff) 40.00 ft / 12.19 m
E (Mainsail Foot) 16.60 ft / 5.06 m
SA Fore 436.63 ft² / 40.56 m²
SA Main 332.00 ft² / 30.84 m²
SA Total (100%) 768.63 ft² / 71.41 m²
Est. Forestay Length 52.88 ft / 16.12 m
Engine & Accommodations
Engine Make Perkins
Engine Type Diesel
Fuel Capacity 80 gals / 303 L
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