The paddle I built this week worked fine ....until I destructively tested it back to "broken iako!" I had nicked the carbon fiber fabric on the blade with a chisel when I was cleaning up excess resin. I filled the nick on the final coat but that is where it failed. I was paddling as hard as I could and snap the blade folded - starting from the cut fibers . Not to worry, I've removed the broken bits from the shaft and have a new and improved blade started. Beta 1 was pretty light, about 4-5 oz lighter than production CF blades of this size so on Beta 2 I've decided to add a 2 mm sheet of plywood to back up the CF as the balsa certainly doesn't provide any strength. The plywood adds about 3 oz. The other thing I'm working on is vacuum bagging. For paddle making my neglected food vacuum bagging unit may just be the ticket. I did a test run on Friday when a made a closed cell foam and CF "hockey puck" the vacuum bagging part worked great though with only one layer of CF the whole thing remains spongy.