Este artigo discute composição de alas e parece ser um download gratuito em PDF. Aparentemente, a asa adicional fornece sustentação para descarregar o rotor, permitindo que eles trabalhem mais no fornecimento de propulsão para a frente e aliviando algumas de suas necessidades para também criar sustentação. A figura no topo da página 6 mostra o helicóptero com a asa adicionada com suportes externos na asa.
The compound helicopter configuration, known as the hybrid compound helicopter, features both wing and thrust compounding. The wing offloads the main rotor at high speeds whereas two propellers provide additional axial thrust as well as yaw control. This study investigates the maneuverability of these two helicopter configurations using inverse simulation. The results predict that a hybrid compound helicopter configuration is capable of attaining greater load factors than its conventional counterpart, when flying a Pullup-Pushover maneuver. In terms of the Accel-Decel maneuver, the two helicopter configurations are capable of completing the maneuver in comparable time-scales. However, the addition of thrust compounding to the compound helicopter design reduces the pitch attitude required throughout the acceleration stage of the maneuver.