Airfoil Shape: Eppler 423 Selected for high coefficient of lift at relatively low speeds

1. Airfoil Shape: Eppler 423 • Selected for high coefficient of lift at relatively low speeds • 32 balsa wood short ribs, 6 long ribs to support flaps and ailerons • Wing Construction Method • Ribs cut from 3/32 in. balsa sheets • Laser cutter used to ensure precision • Ribs were attached to 4 spars of various dimensions • Ribs were glued to leading edge, trailing edge, mid-chord spars to give wing rigidity and strength • Webbing used to join mid chord spars for additional strength Wing design in Solidworks • Wing Covering • 1/16 in. balsa wood sheets sprayed with ammonia/water mixture and curved around the leading edge • The entire wing was covered in Monokote which is a plastic type shrink wrap that allows complex curves to be covered Stress analysis in Solidworks • Engine • O.S. .61FX with E-4010 Muffler • Fuel Tank • Great Planes Fuel Tank 12 oz. • Propeller • Wooden 13x5 Propeller • Engine Cowl • Constructed using balsa sticks and sheets glued together and shaped with sand paper and files • Decreases the blockage area from the front of the plane • Increases airflow across the engine