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San Juan 21 2
Designer: Don Clark  ·  Builder: Clark Boat Co. (Usa)  ·  First built: 1974
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About the San Juan 21 2

Designed as an accessible and fun daysailer, the San Juan 21 2 carries on the legacy of the popular San Juan line of small sailboats that earned a loyal following among recreational sailors in North America. Built for affordability and ease of use, this compact vessel is well suited to protected coastal waters, lakes, and bays, making it an appealing option for weekend sailors, beginners, and those looking for a low-maintenance entry into the sport. The San Juan series was known for producing light, responsive hulls that reward attentive helmsmanship without demanding expert-level skill. The 21 2 fits comfortably within that tradition, offering a boat that is easy to trailer, rig, and launch — qualities that matter enormously to sailors with limited time and storage options. Its modest size makes it manageable for short-handed sailing or small crews. For buyers researching a first boat or a simple recreational platform, the San Juan 21 2 represents a practical and proven choice. Its used market availability also tends to make it a budget-friendly option for those prioritizing time on the water over premium specifications.

Core Dimensions
LOA (Length Overall) 20.50 ft / 6.25 m
LWL (Waterline Length) 17.00 ft / 5.18 m
Beam 7.00 ft / 2.13 m
Max Draft 4.00 ft / 1.22 m
Displacement 1,250.00 lb / 567 kg
Ballast 400.00 lb / 181 kg
Design & Construction
Hull Type Swing Keel
Rigging Type Fractional Sloop
Construction FG
Designer Don Clark
Builder Clark Boat Co. (USA)
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
252
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
32.0
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
113.58
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. 2.55 pounds/inch
Rig Dimensions
I (Foretriangle Height) 0.70 ft / 0.21 m
J (Foretriangle Base) 8.21 ft / 2.50 m
P (Mainsail Luff) 193.00 ft² / 17.93 m²
E (Mainsail Foot) 113.58
How It Compares

vs. Cal 21, Holder 20, Precision 21

This boat Similar boats
Dimensions
LOA
San Juan 21 2 ★
20.5 ft
Cal 21
20.5 ft
Holder 20
20.3 ft
Precision 21
20.8 ft
LWL
San Juan 21 2 ★
17.0 ft
Cal 21
16.7 ft
Holder 20
18.4 ft
Precision 21
17.5 ft
Beam
San Juan 21 2 ★
7.0 ft
Cal 21
6.7 ft
Holder 20
7.8 ft
Precision 21
8.3 ft
Displacement
San Juan 21 2 ★
1 lbs
Cal 21
1 lbs
Holder 20
1 lbs
Precision 21
1 lbs
Ballast
San Juan 21 2 ★
400 lbs
Cal 21
360 lbs
Holder 20
260 lbs
Precision 21
600 lbs
Sail Area
San Juan 21 2 ★
Cal 21
196 sq ft
Holder 20
194 sq ft
Precision 21
203 sq ft
Performance
PHRF Rating (lower = faster)
San Juan 21 2 ★
252 s/nm
Cal 21
261 s/nm
Holder 20
186 s/nm
Precision 21
243 s/nm
SA / Displacement (higher = more powerful)
San Juan 21 2 ★
Cal 21
29.5
Holder 20
28.2
Precision 21
21.4
Ballast / Disp (higher = stiffer)
San Juan 21 2 ★
32.0 %
Cal 21
32.7 %
Holder 20
22.4 %
Precision 21
32.0 %
Comfort Ratio (higher = more comfortable offshore)
San Juan 21 2 ★
Cal 21
7.6
Holder 20
6.1
Precision 21
9.4
Capsize Screening (lower = safer)
San Juan 21 2 ★
Cal 21
2.59
Holder 20
2.98
Precision 21
2.68
Displacement / Length (lower = lighter)
San Juan 21 2 ★
113
Cal 21
106
Holder 20
82
Precision 21
156
Hull Speed
San Juan 21 2 ★
Cal 21
5.5 kts
Holder 20
5.8 kts
Precision 21
5.6 kts
Speed Number (higher = faster)
San Juan 21 2 ★
Cal 21
6.0
Holder 20
6.4
Precision 21
3.7
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