J 70
Boat highlights
J 70 is currently estimated in the Very Good band with an SBP score of 126.
Length overall
22.7 ft
Primary sail area
280 ft²
Displacement
1,750 lbs
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Performance Analysis
Detailed performance metrics and polar diagram for J 70.
Methodology note: SBP scores, polar diagrams, hull-speed values, and derived ratios are estimates. Use them for comparison and planning support—not as a substitute for manufacturer specifications, measured sea trials, rating certificates, professional weather routing, or safety margins. Review how we rate boats.
Performance Metrics
Speed Estimates
| Wind Speed (kn) | Beat VMG (kn) | Run VMG (kn) |
|---|---|---|
| 6 | 3.0 | 3.5 |
| 8 | 3.7 | 4.4 |
| 10 | 4.2 | 5.1 |
| 12 | 4.4 | 5.6 |
| 14 | 4.5 | 6.1 |
| 16 | 4.5 | 6.7 |
| 20 | 4.5 | 9.0 |
Polar Diagram
Wind Speed (kn)
Key Specifications
Explore the hull dimensions and sail plan for J 70.
Dimensions
Sails
Construction ratios
Discussion
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Log in to commentData sources and methodology
Published specifications are kept separate from calculated ratios and estimated performance. SBP and speed outputs are model-based estimates, not owner ratings or certified handicaps.
- Specifications
- verified
- Ratios
- derived
- Performance
- estimated
Last checked: 27 Aug 2026. Source: J Boats official website. Read the SBP methodology.
