I'm working with some talented youngsters on aerodynamics and glider design and am having a hard time explaining exactly WHY elliptical lift distribution (and the resulting elliptical planform) is a theoretical ideal. Does anyone have a great simple way of thinking about it? Good modes of explanation are what I'm after here. TIA Scobie in Seattle RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]