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B-31 (BOSTROM) and designed by Bruno Boström/Grandinsson. Her first hull was built in 1973 with an overall lengh of 9.34 m or 30.64 ft long
| Overall Length (LOA) m / ft | 9.34 m / 30.64 ft |
| Designer(s) | Bruno Boström/Grandinsson |
| Hull Type | Fin with rudder on skeg |
| Number of Hulls Built | 1000 |
| First Hull Built | 1973 |
| Last Hull Built | 1988 |
| Ballast Type | Iron |
| Rigging Type | Masthead Sloop |
| Unsinkable | No |
| Trailerable | No |
| Ballast Ratio | 48.16 |
| Overall Length (LOA) | 9.34 m / 30.64 ft |
| Waterline Length (LWL) | 7.92 m / 25.98 ft |
| Beam (width) | 2.76 m / 9.06 ft |
| Draft | 1.80 m / 5.91 ft |
| Light Displacement (MLC) | 3530 kg / 7782 lb |
| Maximum Displacement | 3530 kg / 7782 lb |
| Ballast Weight | 1700 kg / 3748 lb |
| Capsize Screening Formula (CSF) | 1.83 |
| Comfort Ratio | 23.32 |
| Displacement-Length Ratio (DLR) | 198.12 |
| Ballast Ratio | 48.16 |
| Sail Area to Displacement | 15.12 |
| Estimated Forestay Length | 11.97 m / 39.27 ft |
| Reported Sail Area | 34.37 m² / 370.00 ft² |
| Total Sail Area | 34.40 m² / 370.24 ft² |
| Mainsail Area | 13.58 m² / 146.21 ft² |
| I | 37.40 ft * 11.40 m |
| J | 11.98 ft * 3.65 m |
| P | 31.82 ft * 9.70 m |
| E | 9.19 ft * 2.80 m |
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