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J34
Designer: Rodney S. Johnstone  ·  Builder: J Boats Tillotson Pearson  ·  First built: 1985
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About the J34

With limited specifications available in current databases, the J34 represents an intriguing gap in sailboat documentation that highlights the challenges of preserving comprehensive records for all production vessels. This boat appears to be part of the broader J-Boats lineage, a manufacturer renowned for creating performance-oriented sailboats that balance racing capability with cruising comfort. Given J-Boats' established design philosophy, the J34 likely embodies the company's signature approach of clean lines, efficient rigs, and responsive handling characteristics. The manufacturer has consistently focused on creating boats that appeal to sailors seeking spirited performance without sacrificing livability, suggesting this model would suit coastal cruising and club racing environments. The scarcity of readily available information about the J34 may indicate limited production numbers or a shorter manufacturing run compared to other J-Boats models. For prospective buyers interested in this particular vessel, conducting thorough research through sailing forums, contacting J-Boats directly, or connecting with existing owners becomes especially important to understand the boat's specific characteristics, performance traits, and any unique design elements that distinguish it within the J-Boats family.

Core Dimensions
LOA (Length Overall) 34.00 ft / 10.36 m
LWL (Waterline Length) 26.00 ft / 7.92 m
Beam 11.20 ft / 3.41 m
Max Draft 6.20 ft / 1.89 m
Displacement 8,100.00 lb / 3,674 kg
Ballast 3,400.00 lb / 1,542 kg
Sail Area (Reported) 505.00 ft² / 46.92 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Rodney S. Johnstone
Builder J Boats Tillotson Pearson
First Built 1985
Last Built 1987
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
20.1
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
17.65
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
2.23
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. 6.83
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
2.98
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) 44.0
J (Foretriangle Base) 12.6
P (Mainsail Luff) 38.0
E (Mainsail Foot) 12.0
SA Fore 277.2
SA Main 228.0
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