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X 1 Ton
Designer: Niels Jeppesen  ·  Builder: X Yachts  ·  First built: 1986
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About the X 1 Ton

Originating from the Danish boatbuilder X-Yachts, the X 1 Ton represents an intriguing chapter in the competitive racing heritage that has come to define the brand's reputation. Designed to compete within the One Ton Cup rating class, this yacht emerged during an era when measurement rule racing was at the height of its popularity, producing a generation of fast, purpose-built hulls that pushed designers and sailors alike to their limits. As a One Ton class racer, the X 1 Ton was built with performance as its primary objective, making it well suited to inshore and offshore racing in the hands of an experienced crew. Its design would reflect the priorities of the rating rules of its time, likely featuring a fine hull form optimized for speed across a range of wind conditions. For the modern buyer, an X 1 Ton represents an opportunity to own a piece of competitive sailing history with genuine racing pedigree. While detailed specifications can be limited given the boat's age, prospective buyers are encouraged to research individual examples carefully and consult with experienced surveyors familiar with vintage racing yachts.

Core Dimensions
LOA (Length Overall) 39.75 ft / 12.12 m
LWL (Waterline Length) 33.14 ft / 10.10 m
Beam 12.92 ft / 3.94 m
Max Draft 7.50 ft / 2.29 m
Displacement 13,200.00 lb / 5,987 kg
Sail Area (Reported) 818.00 ft² / 75.99 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Fractional Sloop
Construction FG
Designer Niels Jeppesen
Builder X Yachts
First Built 1986
Last Built 1989
Related Sailboats X 402 · J/39 · Contest 40S · Nordic 40 · X4
Owner Reviews

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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
23.52
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
19.23
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
2.19
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. 7.71
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
4.02
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. 1.0
Rig Dimensions
I (Foretriangle Height) 47.6
J (Foretriangle Base) 13.8
P (Mainsail Luff) 51.5
E (Mainsail Foot) 19.0
SA Fore 328.44
SA Main 489.25
How It Compares

vs. Contest 40S, J/39, Nordic 40, X 402, X4

This boat Similar boats
Dimensions
LOA
X 1 Ton ★
39.8 ft
Contest 40S
39.7 ft
J/39
39.8 ft
Nordic 40
39.7 ft
X 402
39.7 ft
X4
39.7 ft
LWL
X 1 Ton ★
33.1 ft
Contest 40S
30.8 ft
J/39
33.5 ft
Nordic 40
32.5 ft
X 402
33.2 ft
X4
34.1 ft
Beam
X 1 Ton ★
12.9 ft
Contest 40S
12.7 ft
J/39
13.0 ft
Nordic 40
12.4 ft
X 402
12.9 ft
X4
12.5 ft
Displacement
X 1 Ton ★
13 lbs
Contest 40S
26 lbs
J/39
16 lbs
Nordic 40
18 lbs
X 402
13 lbs
X4
17 lbs
Ballast
X 1 Ton ★
Contest 40S
10 lbs
J/39
6 lbs
Nordic 40
7 lbs
X 402
6 lbs
X4
6 lbs
Sail Area
X 1 Ton ★
818 sq ft
Contest 40S
767 sq ft
J/39
720 sq ft
Nordic 40
756 sq ft
X 402
703 sq ft
X4
818 sq ft
Performance
PHRF Rating (lower = faster)
X 1 Ton ★
Contest 40S
186 s/nm
J/39
45 s/nm
Nordic 40
105 s/nm
X 402
78 s/nm
X4
SA / Displacement (higher = more powerful)
X 1 Ton ★
23.5
Contest 40S
14.0
J/39
16.9
Nordic 40
17.7
X 402
20.2
X4
19.2
Ballast / Disp (higher = stiffer)
X 1 Ton ★
Contest 40S
38.5 %
J/39
39.4 %
Nordic 40
39.4 %
X 402
51.7 %
X4
Comfort Ratio (higher = more comfortable offshore)
X 1 Ton ★
19.2
Contest 40S
40.8
J/39
33.7
Nordic 40
28.0
X 402
19.2
X4
26.7
Capsize Screening (lower = safer)
X 1 Ton ★
2.19
Contest 40S
1.71
J/39
1.61
Nordic 40
1.90
X 402
2.19
X4
1.92
Displacement / Length (lower = lighter)
X 1 Ton ★
Contest 40S
397
J/39
168
Nordic 40
234
X 402
161
X4
Hull Speed
X 1 Ton ★
7.7 kts
Contest 40S
7.4 kts
J/39
9.4 kts
Nordic 40
7.6 kts
X 402
7.7 kts
X4
7.8 kts
Speed Number (higher = faster)
X 1 Ton ★
4.0
Contest 40S
1.0
J/39
Nordic 40
2.4
X 402
3.6
X4
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