The XB-40 and XB-41 were secret, little-known experimental modifications of the B-17F and B-24D, respectively, into heavily-armed bomber gunships sometimes referred to as "bomber escorters”. They wer

In 1935 the USAAC wanted to build a potential intercontinental bomber, a 'Guardian of the Hemisphere,' and granted Donald Douglas a contract to build the world's largest bomber. The groundwork for th