a friend of mine is currently working on a Pronefoil Board that also suits when powered with a Wing.
We are concerned about the Box Position from Tail. Where should this be Placed, does the standard 50cm rule apply?
From my little experience the box position of prone boards work pretty well as is for winging. I have a 4’3 30L prone board from a big brand (Takoon) and I take it out winging as a sinker when there is enough wind, I don’t move the foil around between winging and proning and it works pretty well.
Must say I ride strapless so I might be naturally adjusting my foot position when riding without really noticing.