美打造“黑鸟之子” 一小时内打击跨洲目标
<p><span word="Lockheed">Lockheed</span> <span word="Martin">Martin</span> <span word="has">has</span> <span word="begun">begun</span> <span word="work">work</span> <span word="on">on</span> <span word="a">a</span> <span word="successor">successor</span> <span word="to">to</span> <span word="the">the</span> <span word="supersonic">supersonic</span> <span word="Blackbird">Blackbird</span> <span word="SR">SR</span>-71 <span word="spy">spy</span> <span word="plane">plane</span>.</p><p><span word="The">The</span> <span word="unmanned">unmanned</span> <span word="SR">SR</span>-72 <span word="will">will</span> <span word="use">use</span> <span word="an">an</span> <span word="engine">engine</span> <span word="that">that</span> <span word="combines">combines</span> <span word="a">a</span> <span word="turbine">turbine</span> <span word="and">and</span> <span word="a">a</span> <span word="ramjet">ramjet</span> <span word="to">to</span> <span word="reach">reach</span> <span word="its">its</span> <span word="top">top</span> <span word="speed">speed</span> <span word="of">of</span> <span word="Mach">Mach</span> 6 - <span word="about">about</span> 3,600<span word="mph">mph</span> (5,800<span word="km">km</span>/<span word="h">h</span>).</p><p><span word="Like">Like</span> <span word="its">its</span> <span word="predecessor">predecessor</span>, <span word="the">the</span> <span word="SR">SR</span>-72 <span word="will">will</span> <span word="be">be</span> <span word="designed">designed</span> <span word="for">for</span> <span word="high">high</span>-<span word="altitude">altitude</span> <span word="surveillance">surveillance</span> <span word="but">but</span> <span word="might">might</span> <span word="also">also</span> <span word="be">be</span> <span word="fitted">fitted</span> <span word="with">with</span> <span word="weapons">weapons</span> <span word="to">to</span> <span word="strike">strike</span> <span word="targets">targets</span>.</p><p><span word="Lockheed">Lockheed</span> <span word="said">said</span> <span word="the">the</span> <span word="aircraft">aircraft</span> <span word="should">should</span> <span word="be">be</span> <span word="operational">operational</span> <span word="by">by</span> 2030.</p><p><span word="Jet">Jet</span> <span word="engines">engines</span></p>
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