YB-40 Flying Fortress

The Boeing YB-40 Flying Fortress was a modification for operational testing purposes of the B-17 Flying Fortress bomber aircraft, converted to act as a heavily armed gunship to support other bombers during World War II. At the time of its development, long-range fighter aircraft such as the North American P-51 Mustang were just entering quantity production, and thus were not yet available to accompany bombers all the way from England to Germany and back.

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1943  Wikimedia, Wikidata
B-40 Flying Fortress; Boeing B-40 Flying Fortress; Boeing Flying Fortress; Boeing YB-40 Flying Fortress; Flying Fortress; Service Test Bomber Design 40
25 produced, 
B-17F Flying Fortress, Douglas, United States Army Air Forces, Vega Aircraft Corporation, United States, 

B-17F Flying Fortress, XB-47 Stratojet, Y1B-17 Flying Fortress, Y1B-9, Y1B-9A, YB-9, 

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Location: KML, Cluster Map, Maps,

Frameless

Type	Subtype	Date	Description	Notes	Source