I read a lot about oars before making a set for my NE Dory. I settled on 8' length, and they work well in all three rowing stations. Mine are flat blade oars base on the Peter Culler design.

   Oar length = ((A+B)+9)x1.34
A is beam at oarlock
B is water to bottom surface of oarlock (in inches)

I think this is from John Harris's article in woodenboat.

   Jacardan2,

Can you tell a difference between the spoons and the flat blades?  If so what?

Thanks!

Curt