J/105
Specifications
Hull
| LOA | 34.5 ft |
| LWL | 29.5 ft |
| Beam | 11 ft |
| Draft | 6.5 ft |
| Displacement | 7,750 lb |
| Ballast | 3,417.2 lb |
| Material | 34’ 5”10.5 m |
| Hull speed1.34·√LWL | 7.3 kn |
Rig & Sails
| Iforetriangle height | 40.6 ft |
| Jforetriangle base | 13.5 ft |
| Pmainsail luff | 41.5 ft |
| Emainsail foot | 14.6 ft |
| FLforestay | 13.5 ft |
| Mainsail | 601.2 sq ft |
| Jib (100%) | 274.1 sq ft |
| Spinnaker | 483.1 sq ft |
Accommodation
| Cabins | 1 |
| Berths | 2 |
| Heads | 1 |
| Fuel | 11.9 L |
| CE category | N/A€ |
About the J/105
The J/105 is a 34.5 ft fractional sloop designed by Rodney S. Johnstone and built by J Boats Tillotson Pearson (USA) in 1995. With a displacement of 7750.0 lb and a beam of 11.0 ft, this vessel represents a specific era of performance cruising, though the exact total hulls built is unknown.
- Best for:
- This boat suits coastal cruisers and performance-oriented sailors who prioritize speed and handling over heavy offshore comfort, given its low D/L ratio of 134.77 and high SA/D ratio of 23.65.
- Bluewater capability:
- With a capsize ratio of 2.23 and a comfort ratio of 15.85, the J/105 is better suited for coastal and protected waters rather than heavy bluewater passages.
- Comparables:
- Comparable boats include the J/109 and J/110 from the same manufacturer and era, as they share similar fractional rig configurations and performance-focused hull forms.
Performance
ORC Performance Data(3 certificates)
Measured performance data from ORC (Offshore Racing Congress) certificates.
Polar Diagram
Boat speed (kn) vs. true wind angle. Source: ORC
Racing Ratings
Triple Number
ORC Measured
Sail Areas (ORC)
Speed Table (kn)
| TWA \ TWS | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 20 | 24 |
|---|---|---|---|---|---|---|---|---|---|
| 52° | 4.1 | 5.5 | 6.5 | 7.0 | 7.2 | 7.4 | 7.4 | 7.5 | 7.6 |
| 60° | 4.3 | 5.8 | 6.7 | 7.2 | 7.4 | 7.5 | 7.6 | 7.8 | 7.8 |
| 75° | 4.5 | 5.9 | 6.8 | 7.3 | 7.6 | 7.8 | 8.0 | 8.2 | 8.3 |
| 90° | 4.3 | 5.8 | 6.8 | 7.4 | 7.6 | 7.9 | 8.2 | 8.6 | 8.8 |
| 110° | 4.3 | 5.9 | 7.0 | 7.6 | 8.1 | 8.4 | 8.8 | 9.3 | 9.9 |
| 120° | 4.2 | 5.7 | 6.9 | 7.5 | 8.0 | 8.5 | 9.0 | 10.0 | 11.0 |
| 135° | 3.6 | 5.1 | 6.3 | 7.2 | 7.7 | 8.2 | 8.8 | 10.3 | 13.2 |
| 150° | 3.0 | 4.3 | 5.5 | 6.4 | 7.1 | 7.6 | 8.0 | 9.0 | 11.5 |
| Beat VMG | 2.6 | 3.6 | 4.4 | 5.0 | 5.2 | 5.3 | 5.4 | 5.5 | 5.5 |
| Run VMG | 2.6 | 3.7 | 4.7 | 5.6 | 6.2 | 6.6 | 7.0 | 7.8 | 10.0 |
Images
Estimated Value
Low ConfidenceAsking price by model year
5 listings · boat years 1997–2002 · median $69,900
Each dot is one listing · hover for details · dashed red line marks the median · obvious data-entry outliers (top & bottom 2.5%) excluded.
Estimated Cost of Ownership
Based on 34.5ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
11 reported issues across 6 systems for the J/105, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a J/105? This is an in-depth report on the faults this model is known for — so you know exactly what to check when you walk the boat. For the price of a coffee.
- ✓ All 11 specific issues — severity, symptoms & fixes
- ✓ Model-specific pre-purchase inspection checklist
- ✓ Downloadable PDF to take to your surveyor — yours to keep
One-time $2.99 · secure checkout by Stripe · instant access · 30 days online, PDF yours to keep
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Which engine powers your J/105?
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Used sails that fit the J/105
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