Sorry about that, I should actually read my post before posting it. The boards are 3/4 inch thick by 1 foot wide, several feet long. I would laminate two together and then shape it into a foil.
My teak rudder is wrapped in glass, I'm sure it must get wet in there since there is not any sealant where the pintles are bolted on. It apparently doesn't swell enough to crack the glass. Any idea if pine would swell more than teak?
I'll check out some cedar pricing. As I remember it's fairly rot resistant, so is redwood. I used redwood for the bunks when I built my trailer. Maybe there are some options besides teak.