<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区

          US loses contact with hypersonic test plane

          Updated: 2011-08-12 14:54

          (Agencies)

            Comments() Print Mail Large Medium  Small 分享按鈕 0

          US loses contact with hypersonic test plane

          Falcon Hypersonic Technology Vehicle 2 (HTV-2) is shown in this undated artist's conception, released August 11, 2011. The unmanned US hypersonic glider blasted off from a California air force base on Thursday on a test flight aimed at reaching 20 times the speed of sound, but ground control lost contact with the flight after about 36 minutes, a Pentagon agency said.??[Photo/Agencies]

          WASHINGTON - An unmanned experimental aircraft designed to glide down from the upper atmosphere at 20 times the speed of sound lost contact with ground control on its second test flight on Thursday, a Pentagon agency said.

          The Falcon HTV-2 was launched from Vandenberg Air Force Base in California on a rocket and successfully separated from the launch vehicle, the Defense Advanced Research Projects Agency said.

          The arrowhead-shaped plane was expected to separate from the rocket near the peak of its ascent and glide back to earth, reaching hypersonic speed before rolling and plunging into the Pacific ocean, according to a test diagram posted online.

          About 10 minutes after the flight began, DARPA tweeted that the mission was "on track, entering glide phase." But about 26 minutes later, DARPA tweeted that its monitoring stations had lost contact with the glider.

          "Downrange assets did not reacquire tracking or telemetry," DARPA tweeted about an hour later. "HTV-2 has an autonomous flight termination capacity."

          The loss of communications in the final stages of the test flight was a failure for the agency. During the initial flight test in April, researchers lost contact with the vehicle about nine minutes into the flight.

          The Falcon HTV-2 glider is part of the Defense Department's effort to build what it calls a "prompt global strike" capability that would enable it to hit targets worldwide within an hour with conventional or nuclear warheads.

          US loses contact with hypersonic test plane

          Hot Topics

          The European Central Bank (ECB) held a conference call late on Sunday ahead of the market opening, pledging the ECB will step in to buy eurozone bonds with efforts to forestall the euro zone's debt crisis from spreading.

          主站蜘蛛池模板: 国产精品www夜色影视| 欧美videos粗暴| 脱了老师内裤猛烈进入| 国产精品福利无圣光一区二区| 亚洲国产天堂久久国产91 | 日韩精品中文字幕综合| 天天爱天天做天天爽夜夜揉| 中文字幕一区二区三区在线毛片| 中文字幕午夜AV福利片| 99香蕉国产精品偷在线观看| 久久91综合国产91久久精品| 免费VA国产高清大片在线| 国产美女久久久亚洲综合| 97精品尹人久久大香线蕉| 最新精品国偷自产在线美女足| 欧美18videosex性欧美tube1080| 亚洲丶国产丶欧美一区二区三区| 国产一区二区三区在线观| 欧洲精品亚洲精品日韩专区| 欧洲免费一区二区三区视频| 亚洲最大日韩精品一区| 午夜精品福利亚洲国产| 制服丝袜美腿一区二区| 亚洲视频欧美不卡| 果冻传媒董小宛视频| 麻豆成人传媒一区二区| 国模粉嫩小泬视频在线观看| 国产美女久久久亚洲综合| 人人爽人人爽人人片av东京热| 国产免费无遮挡吸奶头视频| 99热久久只有这里是精品| 如何看色黄视频中文字幕| 亚洲av成人午夜电影在线观看| gay片免费网站| 人妻偷拍一区二区三区| av永久免费网站在线观看| 蜜臀av一区二区三区在线| 日韩高清视频 一区二区| 亚洲精品国产中文字幕| 一区二区三区av在线观看| 无码人妻精品一区二区三区蜜桃|