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China to test next-generation hypersonic engine

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Chinese engineers from the Beijing Research Institute of Machinery are set to test a prototype combined-cycle hypersonic aircraft engine and first-stage carrier rockets later this year, Aviation Week reported.

That will pave the way for the first demonstration flight of a full-scale propulsion system by 2025.

According to the publication, this prototype engine will be the basis for a full-size model that will pave the way for the first demonstration flight of a full-scale propulsion system by 2025.

As experts have noted, the main problem in the creation of such engines is the fact that each of them can operate in a narrow range of speeds but in order to design a power house that would accelerate the aircraft from zero to hypersonic speed (more than Mach 5 or over 6, 2,000 kilometers per hour), that is not yet possible.

The hypersonic engine, which the Chinese engineers are currently working on, is expected to be able to accelerate the aircraft from zero to speeds of more than Mach 10.

The development has been called TRRE [Turbo-aided Rocket-augmented Ram / scramjet Engine].

The uniqueness of such a design is that a single casing combines turbojet, rocket and ramjet air-jet engines together.

Furthermore, the nozzle of this combined power machine has a variable diameter – depending on the speed of flight and which of the three engines is running.

At the first stage of this flight, the engine will operate its low-speed turbojet component. At the next stage, after reaching Mach 2, a rocket and ramjet engine will be turned on.

After Mach 6, the rocket engine switches off and the ramjet reactive air passes into hypersonic mode with an additional supply of liquid oxygen to the combustion chamber.

If successful, the engine could be the first of its type in the world to power a hypersonic vehicle or the first stage of a two-stage-to-orbit spaceplane.

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U.S. Commandos Want This Technology for Special Forces Raids

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For Dungeons & Dragons roleplayers, part of the fun of make-believe adventure is searching for hidden chambers where the monsters keep their treasure. For that matter, it’s a familiar theme in horror movies to have villains and vampires pop out from behind walls and bookcases.

But for U.S. commandos, hidden compartments are not entertainment. They are obstacles to a successful mission to capture fugitives, or seize documents and weapons. And on a house raid in hostile territory, there isn’t a lot of time to go tapping on walls to find a stash.

That’s why U.S. Special Operations Command (SOCOM) wants a detector that can quickly spot where the loot is hidden. The goal of the research project is to develop a handheld device that can detect hidden chambers in an average-sized room (168 square feet) and at a range of about 6.5 feet during sensitive site exploitation, or SSE, operations.

The sensor should be able to penetrate to a depth of 2 feet and have enough battery power to run for forty to fifty minutes. However, while it needs to detect hidden spaces, it doesn’t need to scan the contents inside. “It doesn’t have to ‘see’ thru a metal surface/container; the presence of a metal chamber in a wall would be a suspicious indication,” SOCOM says.

Sensors that detect the presence of humans, such as infrared, acoustic or radar, already exist or are being developed. But current technology is either too bulky or too complicated, says SOCOM. But developing a handy device poses technical challenges. SOCOM emphasizes that the sensor must be able to distinguish between normal spaces in a wall, such as the gap between studs, and hidden compartments. It also must be able to function with a variety of building materials, including brick, cinder block, concrete, wood and sheet rock. “The system should be able to distinguish suspicious hidden cinder block openings vs normal cinder block voids in normal wall construction,” SOCOM adds.

And the device has to be easy to use and reliable. “For the operator to be willing to carry/operate an additional system, along with all of his other equipment, the system performance needs to be high; a system with low detection rates or high false detection rates will be left behind,” SOCOM points out.

SOCOM suggests that cutting-edge technologies such as modern radio frequency transmit/receive modules, advanced computer vision algorithms and modern computer processors may enable a solution to be found. The research proposal did contain links to a Wikipedia entry on ground-penetrating radar, and a Florida company called Ground Hound Detection Services that detects the presence of underground utilities before construction begins in an area.

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Persistent Systems unveils new Dual Channel Push-to-Talk (PTT) device for the MPU5

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Persistent Systems, LLC (“Persistent”) announced today that it is unveiling its new Dual Channel Push-to-Talk (“Dual PTT”) accessory for the MPU5. The Dual PTT, said company officials, will allow the MPU5’s audio capabilities to reach their full potential.

The Dual PTT allows the user to quickly and easily select between 16 talk groups as well as control volume levels for each talk group independently. When paired with a stereo headset, the two selected talk groups are heard in the left and right ears, and the volume level in each ear can be controlled independently.

Dual PTT will improve networked communications and eliminate extra legacy radios

With the MPU5 and Dual PTT, a single MPU5 can communicate on two talk groups either independently (by pressing a single PTT button) or simultaneously (by pressing both PTT buttons). In the past, when a user needed to communicate with two different groups (channels) of users, that user needed to carry two separate Land Mobile Radios (LMRs). Therefore, the MPU5 and Dual PTT significantly reduces size, weight, power, and cost (SWaP-C) burdens on users.

This is possible because the MPU5 is an IP radio, where talk groups are multicast addresses, instead of an LMR radio, where channels are different RF frequencies.

Dual PTT will improve networked communications and eliminate extra legacy radios

“It used to be that a commander would have to carry a PRC-148 and a PRC-152,” said Brian Mcdonald, Field Operations Manager at Persistent. “Now the commander just carries the MPU5 and can use the Dual PTT to talk to both groups. Carrying one radio instead of two will both save money as well as reduce the load on the soldier, which is a major selling point with customers,” Mcdonald explained.

The Dual PTT also serves as the interface into the MPU5’s Radio over IP (RoIP) subsystem. Users can tether legacy LMR radio systems to the MPU5, and associate each of those radios with one of the 16 talk groups as a multicast address on the network. When an MPU5 user communicates on that talk group, the MPU5 “keys up” the LMR radio and transmits audio through it.

“For the warfighter, this means one can tether a TACSAT channel on a vehicle to the RoIP port on the MPU5 and talk on TACSAT from within a building or tunnel while carrying only an MPU5 and Dual PTT,” said Dr. Herbert Rubens, Founder and CEO of Persistent. “The MPU5’s RoIP capability is compatible with PRC-148s, PRC-152s, Tactical Satellite (TACSAT), Fires Net, Public Safety LMRs, or standard walkie-talkies, which means, for example, being able to talk to Command Net, Assault Net, Fires Net, etc. whenever it’s suddenly required by the mission.”

Persistent has begun accepting orders for the Dual PTT.

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