There is a stack of 2x6x10' and 18'(!) boards in my shop that I got from a home builder a couple years ago. It's wood, that's all I know. I'm in the PNW so it's likely (?) from a relatively local source. Maybe the illusive Hem-Fir?
The idea of building 9 1/2' oars is on my mind. CLC has detailed plans I like for Pete Cullerish oars.
I'd hate to waste the effort of building oars by being cheap. I'm afraid to ask the price of Sitka spruce.
My question is the suitability of generic lumber for this purpose.