I like my 311 shoal draft but it is a bit
tender. I have the impression that the 331 is less so.
311 shoal draft is iron keel.
Sail calculator shows:
Performance Comparison
LOA
Beneteau 311 32.4 Beneteau 331 34
LWL
Beneteau 311 28.1 Beneteau 331 30.5
Beam
Beneteau 311 10.7 Beneteau 331 11.33
Displacement
Beneteau 311 8047 Beneteau 331 11200
Sail Area
Beneteau 311 502 Beneteau 331 525
Capsize Ratio
Beneteau 311 2.14 Beneteau 331 2.03
Hull Speed
Beneteau 311 7.1 Beneteau 331 7.4
Sail Area to
Displacement
Beneteau 311 20 Beneteau 331 16.78
Displacement to LWL
Beneteau 311 162 Beneteau 331 176
LWL to Beam
Beneteau 311 2.63 Beneteau 331 2.69
Motion Comfort
Beneteau 311 17.87 Beneteau 331 21.46
Pounds/Inch
Beneteau 311 1074 Beneteau 331 1235