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San Juan 34
Designer: Hein Driehuyzen/Don Clark  ·  Builder: Clark Boat Co. (Usa)  ·  First built: 1980
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About the San Juan 34

Built from 1980 to 1986 by Clark Boat Co., this mid-sized cruiser represents solid American fiberglass construction from the era when performance cruising was gaining momentum. The collaboration between designers Hein Driehuyzen and Don Clark produced a well-balanced boat that strikes an appealing compromise between comfort and sailing ability. With its fin keel and spade rudder configuration, the San Juan 34 offers responsive handling and decent pointing ability while maintaining the stability needed for coastal cruising and occasional offshore passages. The masthead sloop rig provides versatile sail handling options, making it manageable for couples or small crews. At 10,500 pounds displacement with nearly half that weight in ballast, she carries herself well in a seaway while remaining light enough to be reasonably quick in moderate air. The boat's design philosophy clearly favors practical cruising over pure racing, though the sail area to displacement ratio suggests she won't disappoint sailors looking for spirited performance. Her dimensions create a roomy interior layout typical of early 1980s designs, when builders were learning to maximize space within moderate-sized hulls. This makes her particularly attractive to cruising couples seeking a manageable yet capable boat for extended coastal exploration.

Market Price Estimate Beta
Small sample size. This estimate is based on fewer than 5 listings and may not be representative of the true market. Use with caution.
$4,500 – $4,500
typical asking price
Median $4,500  ·  2 listings used
All listings
$4,500 – $4,500 2
Rate a listing price
$
About this estimate
  • Prices are based on recent asking prices from public listings — not actual sale prices, which are typically lower.
  • Condition is not factored in. A well-maintained boat with new sails and engine can be worth significantly more than a project boat of the same model.
  • Location affects price. Boats in landlocked states or areas with fewer buyers often sell for less than those on the coast.
  • Year of manufacture is not filtered. Older examples of this model will generally be priced lower than newer ones.
  • Included equipment varies widely. A boat with a full suite of electronics, dodger, and new standing rigging may command a large premium.
  • Outliers are automatically excluded using statistical filtering to improve accuracy, but some bad data may remain.
Core Dimensions
LOA (Length Overall) 33.79 ft / 10.30 m
LWL (Waterline Length) 27.92 ft / 8.51 m
Beam 10.92 ft / 3.33 m
Max Draft 5.92 ft / 1.80 m
Displacement 10,500.00 lb / 4,763 kg
Ballast 4,800.00 lb / 2,177 kg
Ballast Type Lead
Sail Area (Reported) 548.00 ft² / 50.91 m²
Headroom 6.25 ft / 1.91 m
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Hein Driehuyzen/Don Clark
Builder Clark Boat Co. (USA)
First Built 1980
Last Built 1986
Owner Reviews

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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
132
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
18.35
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
45.71
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
215.37
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
22.64
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
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. 7.08 kn
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
2.68
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. 1,089.39 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 18.38
Rig Dimensions
I (Foretriangle Height) 45.25 ft / 13.79 m
J (Foretriangle Base) 14.66 ft / 4.47 m
P (Mainsail Luff) 39.50 ft / 12.04 m
E (Mainsail Foot) 11.00 ft / 3.35 m
SA Fore 331.68 ft² / 30.81 m²
SA Main 217.25 ft² / 20.18 m²
SA Total (100%) 548.93 ft² / 51.00 m²
Est. Forestay Length 47.57 ft / 14.50 m
Engine & Accommodations
Engine Make Yanmar
Engine Model 3GM
Engine Type Diesel
Horsepower 24
Fuel Capacity 22 gals / 83 L
Water Capacity 50 gals / 189 L
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