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二战初期,美军战斗机在性能上并非世界顶尖。然而,随着美国参战,其强大的科研、生产能力逐步发挥出巨大威力。由于国土面积广大,美国很早就专注于研制大航程、大运载量的飞机,这也为美军远程重型轰炸机研制奠定了基础。从B-17到B-25,各种大型轰炸机取得了非凡的战果。1940年6月27日,美国陆军与四家飞机制造商签订“超级轰炸机”预研合同,并按优先顺序赋予型号:波音的方案为XB-29,洛克希德为XB-30,道格拉斯XB-31,康绍里德XB-32。最终波音公司以明显优势胜出。B-29轰炸机的设计思路很简单,就是载弹量尽可能大,航程尽可能长,速度尽可能快。说来简单,但要实现上述性能,在当时属于最尖端的科技。最终B-29做到了:它比B-17“空中堡垒”轰炸机大一倍,炸弹装载量也多一倍,最大速度高达640千米/小时。为了在10000米高空飞行,除了炸弹舱之外,B-29的所有座舱都是密封加压。B-29的4台大功率活塞式发动机,每台承连的炸弹重量创当时的世界新纪录。正因如此,B-29被赋予“超级空中堡垒”的绰号。从使用上说,B-29全部在亚洲使用,可以说是为日本“定制”的武器。1944年6月5日,B-29轰炸机从印度基地起飞,飞向第一个攻击目标——泰国首都曼谷周围的铁路设施。同年6月15日,B-29轰炸机再次从印度起飞,途经中国成都加油,长驱直入轰炸位于九州的日本制铁所,大获成功。从此以后,B-29在日本战果累累,日本全境都笼罩在B-29的恐怖梦魇之中,最著名的莫过于“火烧东京”了。最后投向广岛、长崎的两颗原子弹也是由B-29投放。各型B-29共生产了3974架。在二战期间,空袭日本的B-29累计达34790架次,投下的炸弹和燃烧弹合计达170000吨以上。的确,美国为研制B-29花费了大量资金,但也带来了丰厚的回报。假设没有这种飞机,不知道还要多付出多少生命和时间才能结束战争。B-29完全体现了大型轰炸机的价值。
In the early World War II, the performance of the U.S. military fighter was not the highest in the world. However, as the United States entered the war, its powerful scientific research and production capabilities gradually exerted great power. Due to its vast territory, the United States has long focused on the development of large-scale aircraft and large-capacity airplanes, which laid the foundation for the development of the U.S. long-range heavy bomber. From B-17 to B-25, various large bomber aircraft achieved extraordinary success. On June 27, 1940, the U.S. Army entered into a “Superbleeter” pre-research contract with four aircraft manufacturers and prioritized models: Boeing’s plan for the XB-29, Lockheed for the XB-30, Douglas XB-31, Compressor XB-32. Boeing eventually won by a clear advantage. B-29 bomber design is very simple, that is, as much as possible loading capacity, voyage as long as possible, the speed as fast as possible. To put it simply, but to achieve the above performance, was at the time the most cutting-edge technology. Eventually the B-29 did it: twice as big as the B-17 Air Bastion bomber and twice as many bombs as its maximum speed of 640 km / h. In order to fly at a height of 10,000 meters, all cockpits of the B-29 are sealed and pressurized except for bombs. B-29’s four high-power piston engines, each bearing the weight of a bomb hit a new world record. Because of this, the B-29 is given the nickname “Super Sky Fortress.” From the use of said, B-29 all used in Asia, can be said to be Japan “custom ” weapon. On June 5, 1944, the B-29 bomber took off from its base in India and flew to its first target of attack - the rail facility around the Thai capital, Bangkok. On June 15 the same year, the B-29 bomber took off again from India and cheered through Chengdu, the capital of China, to the bombing of the Nippon Steel Works in Kyushu. Since then, B-29 in Japan, the fruitful, all over Japan are shrouded in the B-29 horror nightmare, the most famous than “burning Tokyo.” Finally, the two atomic bombs that hit Hiroshima and Nagasaki will be put on the B-29. All types of B-29 produced a total of 3974. During World War II, air strikes on Japan’s B-29 totaled 34,790 sorties, dropping more than 170,000 tons of bombs and bombs. Indeed, the United States spends a lot of money on developing the B-29, but it has also brought huge returns. Assuming that there is no such aircraft, we do not know how much more life and time is required to end the war. B-29 fully embodies the value of large bomber.