أرسل هذا في رسالة قصيرة: On the design and aerodynamic performance of joined-wing aircrafts

  _____    _    _     _  __   _    _   __    __  
 / ____|| | || | ||  | |/ // | || | || \ \\ / // 
/ //---`' | || | ||  | ' //  | || | ||  \ \/ //  
\ \\___   | \\_/ ||  | . \\  | \\_/ ||   \  //   
 \_____||  \____//   |_|\_\\  \____//     \//    
  `----`    `---`    `-` --`   `---`       `