SIAP4D No fin - as on the McDonnell Douglas X-36. Examples include the Gloster Javelin and McDonnell Douglas DC-9. Multiple fins - examples include the Lockheed Constellation (three), Bellanca 14-13 (three), and the Northrop Grumman E-2 Hawkeye (four). Examples include the Northrop P-61 Black Widow, P-38 Lightning, de Havilland Sea Vixen, Sadler Vampire, and Edgley Optica. Examples include the Antonov An-225 Mriya, B-25 Mitchell, Avro Lancaster, and ERCO Ercoupe. Twin boom A twin boom has two fuselages or booms, with a vertical stabiliser on each, and a horizontal stabiliser between them.|Gibson Les Paul Bass