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The latest project to be announced under the Falcon banner was a fighter-sized unmanned aircraft called Blackswift which would take off from a runway and accelerate to Mach 6 before completing its mission and landing again. The memo of understanding between DARPA and the USAF on Blackswift—also known as the HTV-3X—was signed in September 2007. The Blackswift HTV-3X did not receive needed funding and was canceled in October 2008.[3]
Current research under FALCON program is centered on X-41 Common Aero Vehicle (CAV), a common aerial platform for hypersonic ICBMs and cruise missiles, as well as civilian RLVs and ELVs. The prototype Hypersonic Technology Vehicle 2 (HTV-2) first flew on 22 April 2010; the second test flew 11 August 2011. Both flights ended prematurely.
Contents
Design and development
Past projects
The aim was always to be able to deploy a craft from the continental United States, which could reach anywhere on the planet within one to two hours. The X-20 Dyna-Soar in 1957 was the first publicly acknowledged program—although this would have been launched vertically on a rocket and then glided back to Earth, as the Space Shuttle does, rather than taking off from a runway. Originally, the Shuttle was envisaged as a part-USAF operation, and separate military launch facilities were built at Vandenberg AFB at great cost, though never used. After the open DynaSoar USAF program from 1957–1963, spaceplanes went black. In the mid-1960s, the CIA began work on a high-Mach spyplane called Project Isinglass. This developed into Rheinberry, a design for a Mach-17 air-launched reconnaissance aircraft, which was later canceled.[4]According to Henry F. Cooper, who was the Director of the Strategic Defense Initiative ("Star Wars") under President Reagan, spaceplane projects consumed $4 billion of funding in the 1970s, 1980s and 1990s (excluding the Space Shuttle). This does not include the 1950 and 1960s budgets for the Dynasoar, ISINGLASS, Rheinberry, and any 21st-century spaceplane project which might emerge under Falcon. He told the United States Congress in 2001 that all the United States had in return for those billions of dollars was "one crashed vehicle, a hangar queen, some drop-test articles and static displays".[5] Falcon was allocated US$170 million for budget year 2008.[6]
FALCON
The overall FALCON (Force Application and Launch from CONtinental United States) program announced in 2003 had two major components: a small launch vehicle for carrying payloads to orbit or launching the hypersonic weapons platform payload, and the hypersonic vehicle itself.[2]Small Launch Vehicle
The DARPA FALCON solicitation in 2003 asked for bidders to do development work on proposed vehicles in a first phase of work, then one or more vendors would be selected to build and fly an actual launch vehicle. Companies which won first phase development contracts of $350,000 to $540,000 in November 2003 included:[7]- AirLaunch LLC, Reno Nevada
- Andrews Space Inc., Seattle Washington
- Exquadrum Inc., Victorville California
- KT Engineering, Huntsville Alabama
- Lockheed Martin Corp., New Orleans Louisiana
- Microcosm Inc., El Segundo California
- Orbital Sciences Corp., Dulles Virginia
- Schafer Corp., Chelmsford Massachusetts
- Space Exploration Technologies, El Segundo California
Hypersonic Weapon System
The first phase of the hypersonic weapon system development was won by three bidders in 2003, each receiving a $1.2 to $1.5 million contract for hypersonic vehicle development:[7]- Andrews Space Inc., Seattle, Wash.
- Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Palmdale, Calif.
- Northrop Grumman Corp., Air Combat Systems, El Segundo, Calif.
Follow on hypersonic program
The program was to follow a set of flight tests with a series of hypersonic technology vehicles.[8]
The FALCON project includes:
- X-41 Common Aero Vehicle (CAV): a common aerial platform for hypersonic ICBMs and cruise missiles, as well as civilian RLVs and ELVs.
- Hypersonic Technology Vehicle 1 (HTV-1): a test concept, originally planned to fly in September 2007, now canceled.[9]
- Hypersonic Technology Vehicle 2 (HTV-2): first flew on 22 April 2010, but contact was lost soon after booster separation[10][11][12]
- HTV-3X: Blackswift, now canceled
- Small Launch Vehicle (SLV): a smaller engine to power CAVs, now complete[citation needed]
Blackswift
The Blackswift was a proposed aircraft capable of hypersonic flight designed by the Lockheed Martin Skunk Works, Boeing, and ATK.[15]The USAF states that the "Blackswift flight demonstration vehicle will be powered by a combination turbine engine and ramjet, an all-in-one power plant. The turbine engine accelerates the vehicle to around Mach 3 before the ramjet takes over and boosts the vehicle up to Mach 6."[16] Dr. Stephen Walker, the Deputy Director of DARPA's Tactical Technology Office, will be coordinating the project. He told the USAF website,
I will also be communicating to Lockheed Martin and Pratt & Whitney on how important it is that we get the technical plan in place ... I'm trying to build the bridge at the beginning of the program—to get the communication path flowing.The Falcon program has announced the hypersonic horizontal take-off Blackswift/HTV-3X. It is also launching the HTV-2 off the top of a rocket booster.[17] Falcon seems to be converging from two directions, on the ultimate goal of producing a hypersonic aircraft which can take off and land from a runway in the USA, and be anywhere in the world in an hour or two. Falcon is methodically proceeding toward a Hypersonic Cruise Vehicle. Dr. Walker stated,
We need to fly some hypersonic vehicles—first the expendables, then the reusables—in order to prove to decision makers that this isn't just a dream… We won't overcome the skepticism until we see some hypersonic vehicles flying.
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In October 2008 it was announced that HTV-3X or Blackswift did not receive needed funding in the fiscal year 2009 defense budget and had been canceled. The Hypersonic Cruise Vehicle program will continue with reduced funding.[3][19]
Flight testing
The first HTV-2 flight was launched on 22 April 2010.[10] The HTV-2 glider was to fly 4,800 miles (7,700 km) across the Pacific to Kwajalein at Mach 20.[17] The launch was successful, but the first mission was not completed as planned. Reports stated that contact had been lost with the vehicle nine minutes into the mission.[20][21] In mid-November, DARPA revealed that the test flight had ended when the computer autopilot had "commanded flight termination". According to a DARPA spokesman, "When the onboard system detects [undesirable or unsafe flight] behavior, it forces itself into a controlled roll and pitchover to descend directly into the ocean." Reviews found that the craft had begun to roll violently.[22]
A second flight was launched on 11 August 2011. The unmanned Falcon HTV-2 successfully separated from the booster and entered the mission's glide phase, but again lost contact with control about nine minutes into its planned 30-minute Mach 20 glide flight. Initial reports indicated it purposely impacted the Pacific Ocean along its planned flight path as a safety precaution.[23][24][25] Some analysts thought that the second failure would result in an overhaul of the Falcon program.[26]
Refocus
In July 2013, Darpa decided it would not conduct a third flight test of the HTV-2 because enough data had been collected from the first two flights, and another test was not thought to provide any more usable data for the cost. The tests provided data on flight aerodynamics and high-temperature effects on the aeroshell. Work on the HTV-2 will continue to summer 2014 to provide more study on hypersonic flight. The HTV-2 is the last active part of the Falcon program. Darpa has now changed its focus for the program from global/strategic strike to high-speed tactical deployment to penetrate air defenses and hit targets quickly from a safe distance.[27]See also
- Boeing X-51
- Prompt Global Strike, a follow on military project
- Rockwell X-30 (National AeroSpace Plane)
- Lockheed Martin SR-72
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