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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 I...
因为维加公司有更高生产优先级的项目，所以这些飞机的装配工作被交给了 道格拉斯公司，其中4架为训练机，被称为TB-40. 在其余20架上，美国人尝试了不同的武器配置，一些YB-40在机鼻安装了4挺机枪，还有的尝试安装了40毫米口径的火炮。
The YB-40 Flying Fortress was a modification of the B-17 Flying Fortress in World War 2. Used as heavy armed Gunship to escort other B-17 bombers in formation.
X/YB-40护航轰炸机是美国陆军航空队基于B-17F轰炸机改装的护航轰炸机，外文名X/YB-40 Escort Bomber，旨在通过强化火力为轰炸机编队提供空中支援。该机型源于二战初期B-17轰炸机在日间轰炸德军时因缺乏护航战斗机导致的高战损问题，1942年启动改装计划 [1-3]。
The YB-40 was an attempt to provide a long range escort aircraft to support the Eighth Air Force's daylight bombing campaign over Europe, created by adding extra guns to a standard B-17F
The YB-40 could carry nearly triple the amount of ammunition - 11,200 rounds as compared to 3,900 rounds carried on a B-17F.
History of the Boeing YB-40 Flying Fortress Like other classic aircraft of the WWII era (1939-1945), the Boeing B-17 Flying Fortress heavy bomber was the subject of many experiments and modification projects during it...
In the early years of the Allied Combined Bomber offensive in Europe, before long-range fighters like the P-51D became available, the bombers of the 8th Air Force suffered mightily at the hands of the
1942年8月，美国陆军向Vega飞机公司授权了原型机XB-40的开发。原型机在1942年11月10日进行了首次飞行，之后美国陆军迅速订购了13架实战评估机YB-40（后来又增加了12架）。 YB-40的原型B-17F原本就装备了12门12.7毫米机枪，这是一种重型武装。因此，在YB-40中，除了进一步增加机枪外，还加入了确保每个 ...
The Boeing YB-40 Flying Fortress was a modification of the United States B-17 Flying Fortress bomber aircraft, converted to act as a heavily armed "gunship" for other bombers during World War II. At the time of its de...
