J/34 C
Specifications
Hull
| LOA | 34.5 ft |
| LWL | 30 ft |
| Beam | 11.1 ft |
| Draft | 4.9 ft |
| Displacement | 12,000 lb |
| Ballast | 4,500 lb |
| Hull speed1.34·√LWL | 7.3 kn |
Rig & Sails
| Iforetriangle height | 45.67 ft |
| Jforetriangle base | 13.5 ft |
| Pmainsail luff | 40.5 ft |
| Emainsail foot | 15 ft |
| FLforestay | 13.5 ft |
| Mainsail | 636.3 sq ft |
| Jib (100%) | 308.3 sq ft |
| Spinnaker | 524.1 sq ft |
About the J/34 C
Features 'UFO' keel, which, according to the builder is 'part wing and part bulb'. Displacement was originally listed as 10,000 lb/ 4,536 kg.
The J/34 C is a performance-oriented masthead sloop designed by Rodney S. Johnstone and built by J Boats Tillotson Pearson (USA) between 1986 and 1990. With a total production run of 36 hulls, this model represents a rare and specialized entry in the J/Boats lineup, distinct from the more common J/34 variants.
- Best for:
- This boat is best suited for experienced coastal cruisers and club racers who prioritize speed and handling over heavy offshore comfort, given its relatively light displacement of 12000.0 lb and high sail area-to-displacement ratio of 18.75.
- Bluewater capability:
- While the J/34 C features a moderate capsize ratio of 1.94 and a comfort ratio of 23.97, its light displacement and fin keel configuration suggest it is better suited for protected coastal waters rather than extended bluewater passages.
- Comparables:
- Comparable vessels include the J/34 (standard) and J/35, as they share similar era, designer lineage, and performance-focused hull forms, though the J/34 C is distinguished by its specific build count and production window.
Performance
Pricing
We don't have market pricing data for the J/34 C yet. If you own one, help other buyers — what did you pay for it? Reports build a community price estimate over time.
Estimated Cost of Ownership
Based on 34.5ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
We don't have enough data on the J/34 Cyet to publish model-specific findings we'd stand behind — but here's a free general inspection checklist, built from our research into what actually goes wrong on boats of this kind.
Drawn from 7,029 documented issues across 2,391 models, ordered so the areas that most often turn up problems come first.
Own a J/34 C? Reports from owners are what turn this into a model-specific checklist — and they're the reason the boats above it have one.
Similar Sailboats
Which engine powers your J/34 C?
We haven't confirmed the engine for this model yet. If you own or know one, tell us — as owners report in, we build an accurate picture over time.
Already know your engine? Search all engines → to find its exact parts.
Used sails that fit the J/34 C
Checking eBay for sails sized to this boat's rig…