Discussion in 'Military Aviation' started by asianobserve, Nov 1, 2013.
seems there is another cold war brewing between china and usa
I thought it was satellite imagery that made SR-71 obsolete.
This is the amazing Lockheed Martin SR-72â€”the space Blackbird
U2 is still busy.
Just look it's pic & it's straight air intake .guess it looks stealthy but PAk-fa is not
Read the article smartass. At Mach-6, no one gives two $hits about signature-reduction. Then again, it's just a pretty picture for now.
As a bomber, Mach 6 is fast. As a recon aircraft, mach 6 is slow.
It would be great to know the actual service ceiling of the aircraft. But it will definitely be faster than any planned Russian fighter aircraft. So they will have to start making plans for a mach 6+ fighter jet like they did with Mig-25 and Mig-31 and get it in service in 3 or 4 years after the SR-72 is operational.
To note: 40N6 is already a Mach 12 missile.
This design looks FAR less technical than the SR-71. The Black bird also had Ram jets that by-passed the jet engine, the SR-71 wasted far less space by incorporating the Ram and Turbine solution in one housing which consumed much less space..The Engine to body ratio of SR-71 shows a much larger engine to body weight. While the SR-72 looks like mere wet dream with disproportionate sizes and failure of imagination..
Truth is what ever you can think of they already thought of in the 60s and 70s, You cant do much interms of design development, only newer materials can be used to reduce weight, they played with FAR FAR more designs and brains storms during the cold war. So you young boys cant afford that.
I guess Chinese ASAT capabilities have rustled some jimmies in Pentagon.
Do elaborate, please.
The higher you go, the less capable your speed is in the operational envelope. SAMs will catch you since radars will find you sooner. And today's Russian SAMs are theoretically capable of stopping Mach 15 objects which they are bringing into practical use, let alone mach 6 objects.
Of course, the SR-72 will most probably be more stealthy than a F-22, but that's a different topic considering radars in 2030 would also be different in capability.
Just to be clear again, you're saying Mach-6 is "slow." Right?
Yes, it is. Let me rephrase. It is too slow, probably too low too.
Today's cruise missiles and quasi-ballistic missiles can already do that with conventional technology. And there are missile systems being designed to stop such missiles today. Brahmos 2 will perform the same but with a SCRAMJET, and it will be ready for operation within the decade.
Google SSTO and see where the world is really headed. 2030 should give a far clearer picture for the future of this technology, including the existence of real aircraft with near unlimited range.
Mach 6 looks like a big number today, but that's not enough if you want a survivable aircraft in enemy territory.
That's perfect. Thank you.
Lockheed martin presented this first in their video on their past achievements future projects this was called as global strike platform
SR-71 used as recently as 1998, over Bosnia, before retired for unmanned drones, which is cheaper and safer......they still need a plane over local area of interest, satellite has limitations, like cannot loiter over area .........
Inside America's Next Spyplane
The SR-72 will travel at six times the speed of sound—the fastest military jet ever made—and fly as high as 80,000 feet.
Born in the spy-vs.-spy cauldron of the Cold War, the iconic SR-71 “Blackbird” remains the fastest air-breathing military aircraft the world has known. It flew so high and so fast that enemy defenses were powerless to intercept it. Eventually, satellite technology and advanced radar eroded its advantage. In 1998, the U.S. Air Force retired it. Now, with regional threats growing and portable surface-to-air missiles evolving, engineers have once again set out to build the fastest military jet on the planet.
This time, it will take the form of a 4,000-mile-per-hour reconnaissance drone with strike capability. Known as the SR-72, the aircraft will evade assault, take spy photos, and attack targets at speeds of up to Mach 6. That’s twice as fast as its predecessor.
Aeronautical engineers at Lockheed Martin and Aerojet Rocketdyne have been designing the SR-72 at their Skunk Works black site in California for the past several years. It will require a hybrid propulsion system: a conventional, off-the-shelf turbo jet that can take the plane from runway to Mach 3, and a hypersonic ramjet/scramjet that will push it the rest of the way. Its body will have to withstand the extreme heat of hypersonic flight, when air friction alone could melt steel. Its bombs will have to hit targets from possibly 80,000 feet. Lockheed says the craft could be deployed by 2030. Once it is, the plane’s ability to cover one mile per second means it could reach any location on any continent in an hour—not that you’ll see it coming.
HOW RAMJETS WORK
Ramjets forgo the big rotary compressors needed on turbojets and instead rely on their own forward motion to compress air. First, air is scooped into an inlet and compressed as it funnels into a diffuser. The diffuser also slows the air to subsonic speeds for easier combustion. From there, air and fuel are fed into a combustion chamber and ignited. Finally, an exhaust nozzle accelerates the resulting burst of hot, expanding air, producing massive thrust.
Turbojet engines can take a plane from runway launch to about Mach 3; speeds faster than that require an air-breathing ramjet, which compresses high-speed air for combustion, but which typically begins operating at about Mach 4. To bridge the gap, engineers are developing a hybrid engine that can operate in three modes. The aircraft will accelerate to about Mach 3 under turbojet power, switch to ramjet power to take it to about Mach 5, and then switch again to scramjet mode, which uses supersonic air for combustion.
Aerodynamic friction at speeds exceeding Mach 5 will heat an aircraft’s exterior to 2,000 degrees. At that point, conventional steel airframes will melt. So engineers are looking at composites—the same kinds of high-performance carbon, ceramic, and metal mixes used for the noses of intercontinental ballistic missiles and space shuttles. Every joint and seam must be sealed: Any air leak at hypersonic speed, and the in-rushing heat would cause the aircraft to collapse. (That’s what doomed the space shuttle Columbia).
The stresses on a plane shift as it travels through subsonic, supersonic, and hypersonic speeds. For instance, when a jet is accelerating through subsonic flight, the center of lift moves toward the back of the aircraft. But once the craft hits hypersonic speeds, drag on the plane’s leading egdes cause the center of lift to move forward again. If the ceter of lift gets too close to the center of gravity it can cause dangerous instability. The plane’s shape must tolerate these changes, and more, to keep the craft from tearing apart.
Lockheed describes the SR-72 as an intelligence, surveillance, reconnaissance, and strike platform, but its exact payload is secret. Most likely, it hasn’t yet been invented. Taking spy photos or dropping bombs at Mach 6 will require extraordinary engineering. It will require hundreds of miles to make a turn. It will need powerful guidance computers to line up targets, 80,000 feet below. Also, you can’t just open a bomb bay at 4,000 miles per hour. The SR-72 will need new sensors and weapons to operate at such high speeds.
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