I understand that an elliptical platform is most efficient. I also realize that this is less noticeable with higher aspect ratios. Is there a formula that will express this inefficiency? If I have a 14:1 aspect ratio, how much worse is a constant cord wing than an elliptical wing? A Double taper? Paul RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]