| 查看: 7089 | 回复: 139 | ||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | ||
[资源]
NASA_X战机计划：从X-1到X-55【American X-vehicles: an inventory— X-1 to X-50】
|
||
|
NASA_X战机计划：从X-1到X-55【American X-vehicles: an inventory— X-1 to X-50】 For a while, it seemed the series of experimental aircraft sponsored by the U. S. government had run its course. Between the late 1940s and the late 1970s, almost thirty designations had been allocated to aircraft meant to explore new flight regimes or untried technologies. Then, largely, it ended. But there was a resurgence in the mid- to late-1990s, and as we enter the fourth year of the new millennia, the designations are up to X-50. Many have a misconception that X-vehicles have always explored the high-speed and high-altitude flight regimes— something popularized by Chuck Yeager in the original X-1 and the exploits of the twelve men that flew the X-15. Although these flight regimes have always been in the spotlight, many others have been explored by X-vehicles. The little Bensen X-25 never exceeded 85 mph, and others were limited to speeds of several hundred mph. There has been some criticism that the use of X designations has been corrupted somewhat by including what are essentially prototypes of future operational aircraft, especially the two JSF demonstrators. But this is not new—the X-11 and X-12 from the 1950s were going to be prototypes of the Atlas intercontinental ballistic missile, and the still-born Lockheed X-27 was always intended as a prototype of a production aircraft. So although this practice does not represent the best use of “X” designations, it is not without precedent. 百度网盘下载地址： http://pan.baidu.com/s/1c0rFV2o   QQ截图20131226163545.jpg |
回复此楼» 本帖附件资源列表
-
欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：xiaomuchong@tal.com - 附件 1 : NASA_X战机计划X1-55.pdf
2013-12-26 16:37:03, 1.1 M
» 本帖已获得的红花（最新10朵）
汉风» 猜你喜欢
一志愿厦门大学化学学硕307求调剂
已经有3人回复
-
315分求调剂
已经有4人回复
-
化学调剂一志愿上海交通大学336分-本科上海211
已经有4人回复
-
总分293求调剂
已经有7人回复
-
环境专硕324分求调剂推荐
已经有3人回复
-
284求调剂
已经有3人回复
-
北京林业大学硕导招生广告
已经有6人回复
-
0703化学/290求调剂/本科经历丰富/工科也可
已经有3人回复
-
274求调剂
已经有16人回复
-
一志愿北京化工大学材料与化工（085600）296求调剂
已经有4人回复
56楼2014-03-08 11:06:31
简单回复
皇恩浩荡3楼
2013-12-27 09:48
回复
五星好评 顶一下，感谢分享！
2013-12-27 20:52
回复
五星好评 顶一下，感谢分享！
老虎遇上猫5楼
2013-12-27 22:22
回复
五星好评 顶 [ 发自手机版 http://muchong.com/3g ]
2013-12-28 00:38
回复
五星好评 顶一下，感谢分享！
xinbo8187楼
2013-12-28 16:51
回复
五星好评 顶一下，感谢分享！
zzl8038楼
2013-12-30 23:02
回复
五星好评 顶一下，感谢分享！
wmnick9楼
2013-12-30 23:55
回复
五星好评 顶一下，感谢分享！
zgl200010楼
2013-12-31 01:31
回复
一般 顶一下，感谢分享！
zbxue11楼
2013-12-31 04:05
回复
五星好评 顶一下，感谢分享！
tongren12楼
2013-12-31 08:06
回复
五星好评 顶一下，感谢分享！
zoujt07713楼
2013-12-31 08:46
回复
五星好评 顶一下，感谢分享！
zhf_wx200214楼
2013-12-31 09:17
回复
五星好评 顶一下，感谢分享！
6