Military History | How To Make War | Wars Around the World Rules of Use How to Behave on an Internet Forum
Weapons of the World Discussion Board
   Return to Topic Page
Subject: US Sea-Skimming Mach 2.5 Ramjet missile
Softwar    10/22/2007 1:26:33 PM (while the Coyote is a target missile to test Aegis - it still has the makings of a cruise missile - solid fuel integrated ramjet). Orbital Sciences missile work gets a boost Orbital Sciences Corp. said Monday it won a contract worth up to $37.9 million from the Navy to build 13 more Coyote missiles. The new production order for the Dulles-based manufacturer of small rockets and space systems was issued by the Naval Air Systems Command based at the Patuxent River Naval Air Station in Maryland. Orbital won the initial development contract from the Navy in 2000 to build the supersonic sea-skimming target (SSST) missile and in 2005 completed the development phase, which included six flight tests. Now Orbital is building missiles for actual use. The work on the missiles, which can reach speeds of more than Mach 2.5, is being conducted at the company's launch vehicle engineering and production facility in Chandler, Ariz. Orbital has received orders to build 61 missiles, and 19 of them have been delivered.
Quote    Reply

Show Only Poster Name and Title     Newest to Oldest
doggtag    ...but expect the next generation to be twice as fast!   10/25/2007 8:54:11 PM
Aerojet Demonstrates Combined Cycle Inlet to Enable Hypersonic Flight
(Source: Aerojet; issued Oct. 24, 2007)
SACRAMENTO, Calif. --- Aerojet, a GenCorp company, has completed testing of its Advanced Combined Cycle Integrated Inlet (ACCII). The test campaign, performed at the NASA Langley Unitary Plan Wind Tunnel (UPWT) test facility, was the result of a collaboration of government and industry.  
Aerojet funded the design and fabrication of the ACCII test article, and the Air Force Research Laboratory in Dayton, OH, invested in both the test facility costs and Aerojet for key analysis efforts.  
"This was a great opportunity to work with the Turbine Engine Division, the Aeronautical Sciences Division of the Air Vehicles Directorate, and our industry partners at Aerojet to explore some of the critical design issues in integrating gas turbine and scramjet propulsion cycles into a single highly integrated propulsion system," said Parker Buckley, Chief of the Aerospace Propulsion Division at AFRL. As a collaboration partner, NASA provided test equipment and manpower as well.  
The ACCII test program represents the latest in a long history of combined-cycle approaches to manufacture ever faster aircraft. During the 1960s, the venerable SR-71 Blackbird flew to speeds of Mach 3 using a turbo-ramjet combination cycle. Today, aerospace engineers remain challenged with developing technologies for aircraft capable of flight from runway takeoff to Mach 7 (about one- and a-half miles per second) or better, with conventional jet fuels. Concepts have been studied by the U.S. Air Force and NASA -- from applications such as high speed strike / reconnaissance to low cost 'airplane-like' space launch vehicles.  
Turbine Based Combined Cycle (TBCC) propulsion has been one accepted standard for these future high speed aircraft designs. TBCC combines the low-speed performance and reliability of turbine engines with the performance and simplicity of a dedicated high-speed Scramjet engine. For years, designers have wrestled with the challenge of how to gracefully transition between the low speed and high speed engines as the vehicle accelerates.  
Aerojet's patented ACCII, part of a suite of key combined cycle engine technologies, integrates the needs of the turbine engine and the scramjet engine into one elegant design. "The ACCII inlet provides a true 'combined cycle' approach, allowing smooth transition from low- to high-speed operation through the mission, as if the aircraft had one engine system," said Dick Bregard, Aerojet's vice president of Defense Programs.  
The highly instrumented test article was tested for more than three weeks. The broad test program evaluated influences of several flight conditions as well as multiple hardware configurations. The objective of the test campaign -- to provide data for correlation of design methods and analytical tools -- was met successfully. The team will be analyzing the data in more detail throughout the coming weeks. "We have obtained a wealth of data from this program that will help us confidently develop future combined-cycle propulsion applications for the DoD and NASA," said Dr. David Davis, Chief Engineer of Aerojet's Inlet team.  
Aerojet is a world-recognized aerospace and defense leader principally serving the missile, space propulsion and armaments markets. GenCorp is a leading technology-based manufacturer of aerospace and defense products and systems with a real estate segment that includes activities related to the entitlement, sale and leasing of the company's excess real estate assets.  
Anyone want to bet we'll see missiles utilizing ACCII before we see (production, not prototypes) manned or unmanned aircraft utilize it?
Quote    Reply

dwightlooi       11/6/2007 7:14:33 PM
If the US wants a ramjet powered supersonic AShM we would have built one a long time ago -- the technology has been there since.. geez... the Talos (RIM-8; circa 1959) and they are not expensive! The fact is that we the services have concluded that a Mach 2~2.5 approach speed for an anti-ship missile does not significantly improve the missile's chances of evading enemy fleet air defenses. The reason is that a supersonic target is no more challenging than a subsonic one for our naval SAMs or the enemy's. In fact a supersonic AShM is more detectable -- due to their high sea skimming height and red hot IR signature. The only thing speed gives you is the reduction in reaction time (from ~2.5 minutes to ~45 seconds) and modern naval air defense can handle that easily. Therefore, there is no significant weapon advantage associated with Supersonic AShMs and no attempt over the past 40 years to field a such a weapon.">

Quote    Reply

Charles99       11/10/2007 12:45:44 AM
For the seaskimming model that speed isn't that useful, however the US is working on high speed missiels of this type for the destruction of time sensative land targets.
Quote    Reply