rat,
Thanks for the links to the vids. I am familar with 2 mm and 4mm on wings. I had one Spadette and two BUHOR's with wings both ways. Both flew fantastic. I am in the process of building one of the Bad Boys of spadflyer.com. It is supposed to fly like a sport plane. I also have a Dogfighter with Andy Erwin's modified 2mm wing. That thing is a hoot to fly with a K&B 28 on it. Even added main gear to it. Just couldn't do much with the hand launch.