The Commander 31 bianca is a 30.7ft fractional sloop designed by Knud E. Hansen & Jan Kjærulff and built in fiberglass by Bianca Yachts between 1969 and 1976.
150 units have been built.
The Commander 31 bianca is a heavy sailboat which is under powered. It is very stable / stiff and has an excellent righting capability if capsized. It is best suited as a coastal cruiser.
Main features
| Model | Commander 31 bianca | ||
| Length | 30.70 ft | ||
| Beam | 8.83 ft | ||
| Draft | 3.70 ft | ||
| Country | Denmark (Europe) | ||
| Estimated price | $ 0 | ?? | 
Ratios
| Sail area / displ. | 13.73 | ||
| Ballast / displ. | 45.69 % | ||
| Displ. / length | 323.46 | ||
| Comfort ratio | 26.62 | ||
| Capsize | 1.79 | 
Hull
| Hull type | Monohull fin keel with rudder on skeg | ||
| Construction | Fiberglass | ||
| Waterline length | 22 ft | ||
| Maximum draft | 3.70 ft | ||
| Displacement | 7715 lbs | ||
| Ballast | 3525 lbs | ||
| Hull speed | 6.29 knots | 
Rigging
| Rigging | Fractional Sloop | ||
| Sail area (100%) | 334 sq.ft | ||
| Air draft | 0 ft | ?? | |
| Sail area fore | 0 sq.ft | ?? | |
| Sail area main | 0 sq.ft | ?? | |
| I | 0 ft | ?? | |
| J | 0 ft | ?? | |
| P | 0 ft | ?? | |
| E | 0 ft | ?? | 
Engine
| Nb engines | 1 | ||
| Total power | 10 HP | ||
| Fuel capacity | 0 gals | 
Accommodations
| Water capacity | 0 gals | ||
| Headroom | 0 ft | ||
| Nb of cabins | 0 | ||
| Nb of berths | 0 | ||
| Nb heads | 0 | 
Builder data
| Builder | Bianca Yachts | ||
| Designer | Knud E. Hansen & Jan Kjærulff | ||
| First built | 1969 | ||
| Last built | 1976 | ||
| Number built | 150 | 
 
                         
                                                     
                                     
                                         
                                         
                                         
                                         
                                         
                                        