If you look at the pic, the board is a long ways forward as it should be so that its infront of the LCG or the board will just lift the stern for zero advantage.


To balance this forward position you have to increase the area of the rudders to drag the lateral centroid aft so you don't have a bad case of weather helm. An example would be the foiling moths where the rudder is the same chord as the board and just 2-300mm shorter, plus its on a gantry which helps also.
The net result is that you have nixed your light air performance with the added wetted area and made the boat a bit more difficult to tack.

What looks like a good solution for the use of banana boards comes from VPLP and the WSL boats that (see below) that I believe should be launched next month.


The web site is web page