Well, I happen to have one of Derek's designs and I could write about it too, but haven't got the time right now. I'm headed for the water and another fabulous day in the Expedition.
Gee, I thought I was having some success in paddling, but I hardly ever use a 90 degree feather. Oh well.
You and Derek should give NC a try. Just kidding, but you can't really fault a guy for being enthusiastic about what turns him on.