The A-20D was a proposed lightweight version of the A-20B with more
powerful turbosupercharged R-2600-7 engines. In addition, larger fuel
tanks were added. However, these tanks were not self-sealing and
would have been a definite hazard in combat. Since the turbosupercharged
A-20 had not been a success, this project never got past the initial
design stage.
Sources:
-
American Combat Planes, Third Enlarged Edition, Ray Wagner, Doubleday,
1982.
-
McDonnell Douglas Aircraft Since 1920, Vol 1, Rene J. Francillon,
Naval Institute Press, 1988
-
United States Military Aircraft Since 1909, Gordon Swanborough and
Peter M. Bowers, Smithsonian, 1989.
-
A-20 Havoc in Action, Aircraft Number 144, Squadron/Signal Publications,
Jim Mesko, 1994.
-
Famous Bombers of the Second World War, William Green, Doubleday, 1960
-
Boston, Mitchell and Liberator In Australian Service, Stewart Wilson,
Aerospace Publications, 1992.
-
Jane's Fighting Aircraft of World War II, Military Press, 1989.