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Sigma 41
Designer: David Thomas  ·  Builder: Sigma Yachts  ·  First built: 1982
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About the Sigma 41

Developed by the British yard Sigma Yachts, the Sigma 41 earned a solid reputation as a capable and versatile performance cruiser-racer during its production run. Built to appeal to sailors who wanted genuine offshore ability without sacrificing competitive racing potential, the design struck a balance that made it popular in British sailing circles and beyond. The Sigma 41 carries the hallmarks of the broader Sigma range — clean, purposeful lines with an emphasis on seakeeping and speed. She is well regarded for her lively performance in a range of conditions, making her equally at home on an offshore passage as she is competing in coastal or club racing. The hull design prioritises stability and control, giving crews confidence when conditions build. For prospective buyers, the Sigma 41 represents an appealing option in the used market for those seeking a boat that performs creditably on the race course while remaining genuinely manageable for short-handed coastal sailing or longer bluewater passages. Her established class following in the UK also means that finding experienced owners and class knowledge is relatively straightforward, which can be a real advantage when evaluating a purchase.

Core Dimensions
LOA (Length Overall) 41.00 ft / 12.50 m
LWL (Waterline Length) 33.33 ft / 10.16 m
Beam 12.17 ft / 3.71 m
Max Draft 6.00 ft / 1.83 m
Displacement 19,000.00 lb / 8,618 kg
Sail Area (Reported) 710.00 ft² / 65.96 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer David Thomas
Builder Sigma Yachts
First Built 1982
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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
96
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
16.01
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
29.55
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
1.83
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. 7.74
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
2.28
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) 50.5
J (Foretriangle Base) 14.7
P (Mainsail Luff) 44.0
E (Mainsail Foot) 15.4
SA Fore 371.18
SA Main 338.8
How It Compares

vs. Sceptre 41, Sweden Yachts 41, Sydney 41

This boat Similar boats
Dimensions
LOA
Sigma 41 ★
41.0 ft
Sceptre 41
41.0 ft
Sweden Yachts 41
41.0 ft
Sydney 41
41.0 ft
LWL
Sigma 41 ★
33.3 ft
Sceptre 41
36.0 ft
Sweden Yachts 41
32.7 ft
Sydney 41
35.8 ft
Beam
Sigma 41 ★
12.2 ft
Sceptre 41
12.7 ft
Sweden Yachts 41
12.8 ft
Sydney 41
12.1 ft
Displacement
Sigma 41 ★
19 lbs
Sceptre 41
21 lbs
Sweden Yachts 41
18 lbs
Sydney 41
14 lbs
Ballast
Sigma 41 ★
Sceptre 41
8 lbs
Sweden Yachts 41
8 lbs
Sydney 41
5 lbs
Sail Area
Sigma 41 ★
710 sq ft
Sceptre 41
Sweden Yachts 41
Sydney 41
867 sq ft
Performance
PHRF Rating (lower = faster)
Sigma 41 ★
96 s/nm
Sceptre 41
126 s/nm
Sweden Yachts 41
Sydney 41
18 s/nm
SA / Displacement (higher = more powerful)
Sigma 41 ★
16.0
Sceptre 41
Sweden Yachts 41
Sydney 41
23.6
Ballast / Disp (higher = stiffer)
Sigma 41 ★
Sceptre 41
40.5 %
Sweden Yachts 41
43.5 %
Sydney 41
Comfort Ratio (higher = more comfortable offshore)
Sigma 41 ★
29.6
Sceptre 41
Sweden Yachts 41
Sydney 41
21.3
Capsize Screening (lower = safer)
Sigma 41 ★
1.83
Sceptre 41
Sweden Yachts 41
Sydney 41
2.00
Hull Speed
Sigma 41 ★
7.7 kts
Sceptre 41
Sweden Yachts 41
Sydney 41
8.0 kts
Speed Number (higher = faster)
Sigma 41 ★
2.3
Sceptre 41
2.6
Sweden Yachts 41
Sydney 41
4.4
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