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gorgemay said..
Can someone explain the buoyancy to weight ratio?
Just a figure of speech and basic maths. When you are learning you want a floatier board so the higher the ratio the better. As long as the board is more buoyant than your weight plus the weight of the rig, it will float when stationary. So if you and rig together weigh 100Kg and the board is 100Lt then it would be a 1 to 1 ratio, yes?
If the board was 150Lt then it would be 1.5 to 1 - which is same as 3:2. As you get better and sail in higher winds you will want to use a smaller board as they are more fun and controllable at speed in chop, swell, and waves etc.
What musorianin was saying is in his opinion you needn't worry about stability with a 146Lt board.