J 40
Performance Cruiser Built by J Boats
Boat highlights
J 40 is currently in the Decent band with an SBP score of 89.
Length overall
43.3 ft
Primary sail area
1,033 ft²
Displacement
16,755 lbs
Performance band: Decent GPH rating: 596
89
SBP score
Decent band
Quick actions
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Performance Analysis
Detailed performance metrics and polar diagram for J 40.
Performance Metrics
SBP Score
ⓘ
89
ORC GPH
ⓘ
596
Average Speed (GPH)
ⓘ
6.0 kn
Yardstick
ⓘ
81.6
Sail Carry Number
ⓘ
5.0
Planing Potential
ⓘ
1.0 (medium)
Hull Speed
ⓘ
8.1 kn
Speed Estimates
| Wind Speed (kn) | Beat VMG (kn) | Run VMG (kn) |
|---|---|---|
| 6 | 3.8 | 3.4 |
| 8 | 4.5 | 4.4 |
| 10 | 5.1 | 5.3 |
| 12 | 5.4 | 6.1 |
| 14 | 5.6 | 6.8 |
| 16 | 5.6 | 7.4 |
| 20 | 5.7 | 8.3 |
Polar Diagram
Wind Speed (kn)
Key Specifications
Explore the hull dimensions and sail plan for J 40.
Dimensions
Length over all 43.34 ft
Length at Waterline 36.10 ft
Hull Speed 8.1 kn
Beam 12.66 ft
Draft 7.22 ft
Displacement 16,755 lbs
Sails
Main Sail Area 581.25 ft²
Foresail Area 452.08 ft²
Upwind Sail Area 1033.33 ft²
Spinnaker/Gennaker Area N/A ft²
Construction ratios
Sail area-to-displacement (SA/D)
25.3Capsize screening (CSF)
1.96Comfort ratio (CR)
22.8Discussion
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