Home Archive Search Media Media-418415.jpg FRE 8851 IMAGE Download Image By downloading this image, you are agreeing to our Terms and Conditions Two B-17E Flying Fortresses (serial number 41-9131) and (serial number 41-9141) fitted with ball turrets during a test flight. Connections See how this entry relates to other items in the archive by exploring the connections below. Aircraft 41-9131 Aircraft Type: B-17 Flying Fortress 41-9141 Aircraft Type: B-17 Flying Fortress Unit: 301st Bomb Group Revisions Date: 2 Feb 2015 10:00:14 ContributorAAMChangesAAM ingestSourcesIWM, Roger Freeman Collection