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In 2004 the FAA finalized the Sport Pilot/Light Sport Aircraft (LSA) category. This category of affordable aircraft makes owning an aircraft more accessible than ever. There are two airworthiness certification categories: 1 A special light-sport aircraft (S-LSA), sold ready-to-fly that maybe used for flight training, rental, or personal flight, including personal flight instruction. 2 An experimental light-sport aircraft (E-LS), sold in a kit form that may be used for personal recreational flight or personal flight training. This paper describes a design applicable to the first category: S-LSA. The aircraft will be primarily used for recreational purposes and a sport pilot may only operate this airplane during daylight hours. The occupants are seated in tandem. A three-surface design is chosen for its aerodynamic efficiency. The paper describes the design philosophy, design requirements, weight sizing, performance sizing, weight and balance, aerodynamics and stability and control.