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Jet aircraft quickly rendered Douglas' prop-driven XB-42 Mixmaster obsolete

机译：喷气式飞机迅速使道格拉斯的道具驱动XB-42 Mixmaster过时

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Douglas Aircraft Company of Santa Monica, Long Beach and El Segundo, California, was indisputably one of the premier builders of tactical aircraft during World War Ⅱ. The A-20 Havoc (1939) and A-26 Invader (1942), for example, were arguably the best attack-light bomber aircraft in their class. Douglas sought to push the envelope even further when it instigated a company-funded study in early 1943, charging designer Ed Burton and his staff with the job of coming up with a new plane that possessed speed and range comparable to the new Boeing B-29 Superfortress, yet would be considerably smaller and lighter―as well as a lot cheaper. While Douglas was putting its design proposal together, the multiengine tactical bombardment aircraft in service with the U.S. Army Air Forces (USAAF) at the time―namely, the Douglas A-20, the North American B-25 and the Martin B-26 (the A-26 would not reach combat units until late 1944)―were 50 to 100 mph slower than most enemy fighters, possessed service ceilings well below 30,000 feet and had combat radii in the neighborhood of 600 miles. Under combat conditions, early experience with these types had shown that fighter protection en route to and from the targets was absolutely essential. If a new type of tactical bomber was to be developed with sufficient range to reach deeper targets, past the normal operational radius of a fighter escort, it would need to be pretty darned fast and high flying.
机译：毫无疑问，二战期间，圣莫尼卡，长滩和埃尔塞贡多的道格拉斯飞机公司是战术飞机的主要制造商之一。例如，A-20浩劫（1939）和A-26侵略者（1942）被认为是同类飞机中最好的攻击轻型轰炸机。道格拉斯（Douglas）在1943年初发起一项由公司资助的研究时，试图进一步推动这一领域，要求设计师埃德·伯顿（Ed Burton）和他的工作人员想出一款新飞机，该飞机的速度和航程与新波音B-29相当超级堡垒，却要小得多，轻便得多，而且便宜得多。道格拉斯（Douglas）提出其设计建议时，当时是与美国陆军空军（USAAF）一起使用的多引擎战术轰炸机，即道格拉斯A-20，北美B-25和马丁B-26（ A-26直到1944年下半年才可以到达战斗部队）-比大多数敌方战斗机慢50至100英里/小时，服役上限远低于30,000英尺，战斗半径在600英里左右。在战斗条件下，这些类型的早期经验表明，战斗机在进出目标时的防护是绝对必要的。如果要开发一种新型战术轰炸机，其射程要足以达到更深的目标，超过战斗机护卫舰的正常作战半径，就必须非常快速，高空飞行。

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