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Hypersonic Technology Vehicle 2
Hypersonic Technology Vehicle 2 (HTV-2) is a crewless,〔(【引用サイトリンク】title=Experimental aircraft to launch Wednesday from Vandenberg )〕 experimental rocket glider developed as part of the DARPA Falcon Project capable of flying at 13,201 mph (21,000 km/h).〔(【引用サイトリンク】title=A Rocket-Airplane Will Fly Mach 20 Today, But Won't Be Taking Passengers )〕 It is a test bed for technologies to provide the United States with the capability to reach any target in the world within one hour using an unmanned hypersonic bomber aircraft.
==Development==
The Falcon HTV-1 program, which preceded the Falcon HTV-2 program, was conducted in April, 2010. The mission ended within nine minutes from launch.〔 Both these missions are funded by the US Defense Advanced Research Projects Agency (DARPA) to help develop hypersonic technologies and to demonstrate its effectiveness.〔(【引用サイトリンク】title=Falcon Hypersonic Technology Vehicle HTV-2 )〕 Under the original plan, HTV-1 was to feature a hypersonic lift-to-drag ratio (L/D) of 2.5, increasing to 3.5-4 for the HTV-2 and 4-5 for the HTV-3. HTV-2 was to lead to the development of an HTV-3X vehicle, known as Blackswift, which would have formed the basis for deployment around 2025 of a reusable Hypersonic Cruise Vehicle, an unmanned aircraft capable of taking off from a conventional runway with a 5,400 kg (12,000 lb) payload to strike targets 16,650 km away in under 2h. The HCV would have required an L/D of 6-7 at M10 and 130,000 ft (40,000m).〔http://www.flightglobal.com/news/articles/does-us-need-1bn-hypersonic-test-area-after-htv-2-failure-341672/〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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