Bonsoir.
Voiçi la preuve de l'existence de ce programme,
cela me parait crédible et vous ?
http://www.flightglobal.com/Articles...echnology.htmlA key US hypersonics programme is undergoing changes even as Congress urges the creation of a joint technology office to co-ordinate fragmented US high-speed research.
The changes affect the US Defense Advanced Research Projects Agency’s (DARPA) Falcon programme to demonstrate technology for responsive spacelift and global strike. With cutbacks in NASA funding, Falcon has taken on a leading role in US hypersonics and could be affected by any Congressional directive to consolidate research.
DARPA and prime contractor Lockheed Martin have decided not to build and fly the first version of the Falcon hypersonic test vehicle (HTV) after encountering difficulties manufacturing the carbon-carbon aeroshell. Instead, they have shifted efforts to a more producible design for the second in a series of test vehicles, HTV-2, says DARPA Falcon programme manager Dr Steven Walker.
The change will delay a first flight from 2007 for the HTV-1 to late 2008 for the first of two ground-launched, expendable HTV-2s. These will be followed by a reusable HTV-3 closer in design to the objective hypersonic cruise vehicle (HCV). The Mach 10 HTV-3 will be unpowered, but Walker says DARPA has received funding to develop and ground test a propulsion system for the HCV.
Walker says Lockheed has selected a high-Mach turbine engine and supersonic-combustion ramjet (scramjet) for a combined-cycle powerplant enabling the HCV to take off from a runway and accelerate to a hypersonic cruise. Tests of the “inward-turning” inlet and scramjet are planned for later this year.
AFRL and DARPA plan to integrate the HyTECH scramjet with an M4 expendable turbine engine, HiSTED, for a combined-cycle ground demonstration that could lead to flight tests of a large-scale hypersonic cruise X-vehicle. Walker says the HySTED/HyTECH combination is an alternative to the HCV propulsion system being pursued by Lockheed.
http://www.darpa.mil/tto/programs/falcon.htmThe Falcon program objectives are to develop and demonstrate hypersonic technologies that will enable prompt global reach missions. This capability is envisioned to entail a reusable Hypersonic Cruise Vehicle (HCV) capable of delivering 12,000 pounds of payload a distance of 9,000 nautical miles from CONUS in less than two hours. The technologies required by a HCV include high lift-to-drag technologies, high temperature materials, thermal protection systems, and guidance, navigation, and control. Leveraging technology developed under the Hypersonic Flight (HyFly) program, Falcon will address the implications of hypersonic flight and reusability using a series of hypersonic technology vehicles (HTVs) to incrementally demonstrate these required technologies in flight. In order to implement this flight test program in an affordable manner, Falcon will develop a low cost, responsive Small Launch Vehicle (SLV) that can be launched for $5M or less. In addition to hypersonic technology vehicles (HTV) sub-orbital launches, the SLV will be capable of launching small satellites into low earth and sun-synchronous orbits and will provide the nation a new, small payload access to space capability. Thus, the Falcon program addresses many high priority mission areas and applications such as global presence and space lift. DARPA established an MOA with the Air Force for this program in May 2003 and with NASA in October 2004. Falcon capabilities are planned for transition to the Air Force at the conclusion of Phase III, which is anticipated to be completed by FY 2010.
Le futur nous le dira...
Je crois qu'en science il n'y a pas de sujet tabou. Contrairement à une opinion qui est sous-jacente au comportement d'un certain nombre de gens, la science se caractérise par ses méthodes, mais il n'y a pas de sujet interdit en matière scientifique. Il y a des domaines où l'on n'arrive pas à, en fait, créer un sujet scientifique, mais ce n'est pas pour autant que le domaine doive être interdit [André Lebeau, Directeur de la métérologie nationale]
Cordialement,
Europa
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