A pair of symetrical foils can be made out of one mold, while a pair of asymetrical foils requires two molds.
Not necessarily, if you had boards that were the same on each end you could have one mold (with two halves) and flip the board end for end to insert in port vs starboard hull. Assuming the curve was continuous.
You can make a straight board with one mold - two halves if you have a "shark fin" end, or with one mold - one half if you have square ends.
Bill
