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OVNI 31 built by Chantier Alubat (FRA) and designed by Michel Joubert. Her first hull was built in 1976 with an overall lengh of 9.50 m or 31.17 ft long
| Overall Length (LOA) m / ft | 9.50 m / 31.17 ft |
| Builder(s) | Chantiers Alubat |
| Designer(s) | Michel Joubert |
| Brand | Ovni |
| Country | France |
| Hull Type | Fin with rudder on skeg |
| First Hull Built | 1976 |
| Last Hull Built | 1980 |
| Ballast Type | Lead |
| Rigging Type | Masthead Sloop |
| Unsinkable | No |
| Trailerable | No |
| Freshwater Tank Capacity lt/gal | 150 L / 40 gal |
| Ballast Ratio | 42.1 |
| Overall Length (LOA) | 9.50 m / 31.17 ft |
| Waterline Length (LWL) | 7.50 m / 24.61 ft |
| Beam (width) | 3.25 m / 10.66 ft |
| Draft | 1.65 m / 5.41 ft |
| Light Displacement (MLC) | 3800 kg / 8378 lb |
| Maximum Displacement | 3800 kg / 8378 lb |
| Ballast Weight | 1600 kg / 3527 lb |
| Capsize Screening Formula (CSF) | 2.10 |
| Comfort Ratio | 20.83 |
| Displacement-Length Ratio (DLR) | 250.93 |
| Ballast Ratio | 42.1 |
| Sail Area to Displacement | 22.2 |
| Reported Sail Area | 53.00 m² / 570.49 ft² |
| Maximum Headroom | 6.00 ft * 1.83 m |
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