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Mount Desert Island One Design
Designer: Ralph E. Winslow  ·  First built: 1922
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About the Mount Desert Island One Design

Originating from the scenic waters of Mount Desert Island off the coast of Maine, this classic one-design class carries with it the charm and tradition of New England sailing culture. Designed for competitive racing within a strict one-design format, every boat in the class is built to the same specifications, ensuring that race outcomes are determined by sailor skill rather than equipment advantages. The Mount Desert Island One Design is well suited to the sheltered coastal waters and island-dotted anchorages of its home region, where it has long served as a platform for spirited local racing among a dedicated fleet of enthusiasts. Like many regional one-design classes, its appeal lies in the tight-knit community it fosters and the consistency of competition it enables. For a prospective buyer, acquiring a boat in this class means joining an established local sailing community with shared knowledge, camaraderie, and access to organized racing. Those drawn to traditional New England sailing heritage and keenly competitive one-design racing will find this vessel a rewarding and characterful choice.

Core Dimensions
LOA (Length Overall) 21.57 ft / 6.57 m
LWL (Waterline Length) 16.42 ft / 5.00 m
Beam 6.67 ft / 2.03 m
Max Draft 4.00 ft / 1.22 m
Displacement 4,428.00 lb / 2,009 kg
Ballast 1,700.00 lb / 771 kg
Sail Area (Reported) 260.00 ft² / 24.15 m²
Design & Construction
Hull Type Long Keel
Rigging Type Fractional Sloop
Construction Wood
Designer Ralph E. Winslow
First Built 1922
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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
15.47
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
30.39
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
1.63
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. 5.43
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. 391.33
How It Compares

vs. Four 21, Grondin, Kestrel 22 Jones Uk

This boat Similar boats
Dimensions
LOA
Mount Desert Island One Design ★
21.6 ft
Four 21
21.5 ft
Grondin
21.7 ft
Kestrel 22 Jones Uk
21.7 ft
LWL
Mount Desert Island One Design ★
16.4 ft
Four 21
19.5 ft
Grondin
18.5 ft
Kestrel 22 Jones Uk
20.0 ft
Beam
Mount Desert Island One Design ★
6.7 ft
Four 21
7.3 ft
Grondin
7.2 ft
Kestrel 22 Jones Uk
7.1 ft
Displacement
Mount Desert Island One Design ★
4 lbs
Four 21
3 lbs
Grondin
1 lbs
Kestrel 22 Jones Uk
3 lbs
Ballast
Mount Desert Island One Design ★
1 lbs
Four 21
1 lbs
Grondin
Kestrel 22 Jones Uk
Sail Area
Mount Desert Island One Design ★
260 sq ft
Four 21
Grondin
199 sq ft
Kestrel 22 Jones Uk
Performance
SA / Displacement (higher = more powerful)
Mount Desert Island One Design ★
15.5
Four 21
Grondin
25.1
Kestrel 22 Jones Uk
Comfort Ratio (higher = more comfortable offshore)
Mount Desert Island One Design ★
30.4
Four 21
Grondin
8.2
Kestrel 22 Jones Uk
17.4
Capsize Screening (lower = safer)
Mount Desert Island One Design ★
1.63
Four 21
Grondin
2.56
Kestrel 22 Jones Uk
1.94
Hull Speed
Mount Desert Island One Design ★
5.4 kts
Four 21
Grondin
5.8 kts
Kestrel 22 Jones Uk
6.0 kts
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