alot of info for you
Go check out APB (aviation partners Boeing) website, they are the division of boeing that created the winglets and they have a ton of info about them. Im a mechanic working for Delta Airlines installing winglets currently on the UPS fleet. I know UPS also has a winglet line in hong kong currently installing on the other half of their fleet. You should try to get a tour to check out the install, its impressive! Good luck with your theisis