Thanks so much for the explanation, Rotaryphile. I've been competing in the SAE Aero Design West competition for the past two years, and will do it again next year, and the rules for next year limit wing span to a maximum of five feet, so a biplane is definitally in order. This competition is in a way an exercise in increasing the lift to drag ratio, so every little bit will be helpful (such as staggering the wings).