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Udell
Designer: Knud Reimers  ·  Builder: Kungsörs Boatyard  ·  First built: 1955
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About the Udell

Designed by renowned Swedish naval architect Knud Reimers in 1955, this elegant 36-foot sailboat represents classic Scandinavian craftsmanship and thoughtful proportions. Built exclusively by Kungsörs Boatyard, only twelve examples of this distinctive design were ever constructed, making it a rare find in today's market. The Udell's traditional wood construction and fractional sloop rig reflect the sophisticated design principles that made Reimers famous throughout Northern Europe. With a displacement of 4,600 pounds and substantial ballast ratio, this boat offers reassuring stability for coastal cruising and longer passages. The fin keel configuration provides good pointing ability while maintaining reasonable draft for gunkholing. At 36.25 feet overall with a 27.25-foot waterline, the design emphasizes seaworthiness over pure speed, though the hull is capable of reaching its theoretical hull speed of 7 knots in favorable conditions. The modest beam of 6.42 feet creates a sleek profile that cuts through waves efficiently, while the comfort ratio of 19.93 suggests a motion that experienced sailors will find predictable and manageable. This boat suits sailors seeking a well-balanced coastal cruiser with offshore capability, particularly those who appreciate traditional construction methods and timeless Scandinavian design aesthetics.

Core Dimensions
LOA (Length Overall) 36.25 ft / 11.05 m
LWL (Waterline Length) 27.25 ft / 8.31 m
Beam 6.42 ft / 1.96 m
Max Draft 4.50 ft / 1.37 m
Displacement 4,600.00 lb / 2,087 kg
Ballast 2,400.00 lb / 1,089 kg
Sail Area (Reported) 235.00 ft² / 21.83 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Fractional Sloop
Construction Wood
Designer Knud Reimers
Builder Kungsörs Boatyard
First Built 1955
Number Built 12
Related Sailboats Piana 37 · Antigua 37 · J/105 · C Cat 37 · Wasa 30
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
13.63
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
52.17
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
101.49
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
19.93
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
1.55
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. 7.00 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. 625.10 pounds/inch
How It Compares

vs. Antigua 37, C Cat 37, J/105, Piana 37, Wasa 30

This boat Similar boats
Dimensions
LOA
Udell ★
36.3 ft
Antigua 37
37.1 ft
C Cat 37
36.4 ft
J/105
34.5 ft
Piana 37
36.1 ft
Wasa 30
36.1 ft
LWL
Udell ★
27.3 ft
Antigua 37
35.8 ft
C Cat 37
35.6 ft
J/105
30.0 ft
Piana 37
35.0 ft
Wasa 30
29.5 ft
Beam
Udell ★
6.4 ft
Antigua 37
19.7 ft
C Cat 37
19.2 ft
J/105
11.0 ft
Piana 37
19.7 ft
Wasa 30
7.2 ft
Displacement
Udell ★
4 lbs
Antigua 37
9 lbs
C Cat 37
11 lbs
J/105
7 lbs
Piana 37
9 lbs
Wasa 30
5 lbs
Ballast
Udell ★
2 lbs
Antigua 37
C Cat 37
J/105
3 lbs
Piana 37
Wasa 30
2 lbs
Sail Area
Udell ★
235 sq ft
Antigua 37
C Cat 37
J/105
600 sq ft
Piana 37
Wasa 30
Performance
SA / Displacement (higher = more powerful)
Udell ★
13.6
Antigua 37
C Cat 37
J/105
24.1
Piana 37
Wasa 30
Ballast / Disp (higher = stiffer)
Udell ★
52.2 %
Antigua 37
C Cat 37
J/105
44.9 %
Piana 37
Wasa 30
56.2 %
Comfort Ratio (higher = more comfortable offshore)
Udell ★
19.9
Antigua 37
8.0
C Cat 37
9.2
J/105
22.3
Piana 37
8.1
Wasa 30
Capsize Screening (lower = safer)
Udell ★
1.55
Antigua 37
3.67
C Cat 37
3.45
J/105
1.66
Piana 37
3.67
Wasa 30
Displacement / Length (lower = lighter)
Udell ★
101
Antigua 37
96
C Cat 37
109
J/105
103
Piana 37
103
Wasa 30
91
Hull Speed
Udell ★
7.0 kts
Antigua 37
8.0 kts
C Cat 37
8.0 kts
J/105
8.4 kts
Piana 37
7.9 kts
Wasa 30
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