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  27 décembre 2018 | International, Naval

  The US Navy’s surface fleet: Here’s what’s ahead in 2019

  By: David B. Larter WASHINGTON — The U.S. surface fleet has a big year in store for 2019, and we're going to start getting more details very soon on what the future has in store for surface warriors. But surface leadership has been dropping clues on where things are going. Here's a handy reference guide for heading into January's Surface Navy Association annual symposium and for what the fleet has up its sleeve for the coming months. Robot wars The Chief of Naval Operations' Surface Navy Director Rear Adm. Ron Boxall forecast what was on his mind at a recent training and simulation conference in Orlando. The focus for Boxall and the N96 shop will be to get more sensors and weapons into the battlespace, distributed and networked, so that a smaller number of larger warships can act as command and control for smaller units. “If you think about what we are trying to do with the surface force, we have large and small surface combatants that will [ultimately make up part of the 355-ship Navy] but we have no requirement for unmanned surface vessels right now, which I see as an absolutely critical part of distributed lethality, distributed maritime operations environment that we are moving into,” Boxall said. “Ultimately I need more nodes out there.” N96 is looking closely at what might be needed for a large unmanned surface vessel, much like the Sea Hunter drone developed by the Defense Advanced Research Projects Agency. “I think these are what you need to go in the water and carry large things and be more places at less cost,” Boxall said. “So, in that nodal structure, we are looking at them becoming large sensors or large shooters, but we are still working out the requirement.” Developing unmanned vessels for military use was a key component of a recent agreement with NATO forged during the July summit. Future frigate Next year is the crucial year for FFG(X), the year when the Navy finalizes its requirements and puts the first hull out to bid for a 2020 detailed design and construction award. Look for news to creep out on this ship throughout the year but Boxall had some remarks on how it will fit into the fleet now in development. Boxall hinted that the planned 20 hulls may be a low-ball figure, and that he's looking to maybe keep the program going beyond that. “It will be a very capable ship, but it won't have a lot of capacity,” he said. “But it will be able to both sense and shoot and do command and control at a smaller level. It will be a much less expensive platform and I can have more of them.” Training Training is a major focus of Surface Navy boss Vice Adm. Richard Brown, and some ongoing efforts will start to bear fruit in 2019. Earlier in 2018, the Navy reprogrammed $24 million to build a Maritime Skills Training Program, which will be heavily reliant on simulators to bring together officer and enlisted watchstanders from both the bridge and the combat information center to train on equipment and work as a unit. “We've secured the funding for the maritime skills training centers, which is going to do two things: individual officer training through the [officer of the deck training],” Brown said earlier this year. “So that, in conjunction with building out the navigation, seamanship and ship-handling trainers in the fleet concentration areas, will give us integrated bridge and [combat information center] training at the high end. That's my No. 1 priority.” Those facilities will be ready for use by the waterfront in the 2021 time frame, Brown said. Upgrades to existing simulators are being rolled out this month. DDG-1000 Look for news on the future of DDG-1000. The first of the class, the Zumwalt, is wrapping up its combat systems installation in San Diego and will start the process of integrating the three-ship class into the fleet. We're going to find out more about its new mission – surface strike – and how the Navy plans to employ its behemoth new surface combatant. The Navy has pivoted away from its long odyssey to find a use for its advanced gun system, with requirements boss Vice Adm. William Merz saying in testimony in April that the Sisyphean task of getting a working gun on Zumwalt was holding the ship back. “Even at the high cost, we still weren't really getting what we had asked for,” he said. “So what we've elected to do is to separate the gun effort from the ship effort because we really got to the point where now we're holding up the ship.” Instead, efforts are going to focus on getting Zumwalt into the fleet and on the hunt for ships to kill. Large surface combatant Last up, the Large Surface Combatant should start getting some meat on its bones in 2019. Boxall and company are aiming to put the fleet on a course to buy its cruiser and destroyer replacement in 2023 or 2024, which means a request for information from industry could be in the near future. What we know is that, like the small surface combatant, the Navy wants commonality with other nodes in the network. That means a similar radar as on FFG(X), the same combat system and as much overlapping equipment as the fleet can manage to tamp down on compatibility issues and on how much specialized training sailors need to be on one platform or another. https://www.defensenews.com/naval/2018/12/26/the-us-navys-surface-fleet-heres-whats-ahead-in-2019/

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  14 août 2019 | International, Aérospatial

  Precooler Technology Could Bring Advantages To Fighter Engines

  By Tony Osborne Technology developed by Britain's Reaction Engines for its SABRE (Synergistic Air-Breathing Rocket Engine) hypersonic powerplant is to be fitted on the Eurojet EJ200 engine from a Eurofighter Typhoon to understand if the technology can help transform the powerplant's operating envelope. The £10 million ($12 million) project announced by the Royal Air Force (RAF) Rapid Capability Office (RCO) in July will see BAE Systems, Reaction Engines and Rolls-Royce engineers work to better comprehend Reaction's precooler technology and how it could be integrated for use on a jet engine—perhaps even the powerplant for Britain's future combat aircraft, the Tempest. Two-year project will scope integration to better understand precooler potential benefits Heat exchanger is an enabler for Reaction Engines' SABRE technology The trials represent the first acknowledged application of the precooler technology At high speed, jet engines struggle with a thermal challenge as air entering the intake becomes too hot, reducing thrust and limiting the ability to reach speeds beyond Mach 3. Reaction's precooler, essentially a highly efficient heat exchanger, already has proven its ability to quench megawatts of heat energy from the incoming air. Trials in the U.S. have shown the precooler technology to cool intake airflow from more than 800F (426C) to around 212F in just 1/20th of a second, helping to maximize performance. Applied to a fighter engine, the precooler could allow it to work more efficiently at high speeds but also enable manufacturers to be less reliant on exotic, expensive and heat-resistant materials such as titanium. This could lead to lower costs in terms of purchase and maintenance, which are both key focuses of Britain's Future Combat Air System Technology Initiative (FCAS TI). The goal of the FCAS TI is to research and develop new technologies that can be spiraled into Britain's Eurofighter Typhoons and Lockheed Martin F-35s, but also potentially featured in a combat aircraft to replace the Typhoon in the 2030s. “This is Phase 1 of something more,” Air Vice Marshal, Simon “Rocky” Rochelle, chief of staff for capability and the brainchild behind the RAF's RCO, said at the Royal International Air Tattoo, where the contract was signed. “There is something here that needs to be explored, investigated, tested and tried.” Over the next two years, engineers will study how the precooler can be integrated onto the EJ200. Once this is established, the engine and precooler will be ground-tested together. “This isn't about a new market for EJ200. We are using existing assets to try and address that heat challenge,” Conrad Banks, Rolls-Royce's chief engineer for future defense programs, tells Aviation Week. “If you can cool the intake air down, suddenly you can expand the flight envelope of your gas turbine and it introduces some exciting supersonic and hypersonic applications.” There is no suggestion the UK is looking for a hypersonic fighter, especially with the high costs associated with the airframe alone. Nonetheless, the technology could enable higher supercruise performance—sustained supersonic flight without the use of afterburner, or more simply better fuel economy. “What we will do on the testbed is assess the drop in temperature and then see how that affects the core of the engine, that then validates our model. . . . This is not about massively changing the engine,” Banks explains. How the precooler could be fitted to the engine is also part of the scope of the study. One option could be a donut-like configuration around the intake, Banks suggests. The work also will consider how the introduction of a precooler affects the rest of the airframe and whether such an installation is affordable. The precooler fitted to the EJ200 will be “designed and scaled to the engine to match its performance,” says Banks. As Banks describes it, the technology will not change the low-observability aspects of the platform such as the engine's infrared signature, pointing out that will depend on what is done on the back end of the engine. However, officials note such a heat exchanger also could be mounted to the rear of the engine. For Reaction Engines, the trials build on its lightweight heat exchanger (HTX) experiments, which were conducted in Colorado and used a J79 engine from an F-4 Phantom to feed the precooler. The technology is key to the company's SABRE concept, which is targeted at air-breathing hypersonic and space access vehicles. In this role, the engine is designed to efficiently extract oxygen from the atmosphere for rocket combustion. In the fully integrated SABRE, the chilled air will be passed from the HTX to a turbo-compressor and into the rocket thrust chamber, where it will be burned with sub-cooled liquid hydrogen fuel. Reaction Engines has raised over £100 million in the last three years from public and private sources. In addition, the UK government in 2013 announced a £60 million commitment to assist with the demonstrator engines. Strategic investments also have been made at BAE Systems in 2015 and more recently in 2018 by Rolls-Royce and by Boeing's capital venture arm, HorizonX. https://aviationweek.com/defense/precooler-technology-could-bring-advantages-fighter-engines

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  10 février 2024 | International, Terrestre

  ANALYSIS | The political tides of war are shifting — and may be taking Ukraine with them | CBC News

  We have been warned — over and over again lately — that Russia’s invasion of Ukraine is an inflection point in history. And while the soaring political rhetoric may have sounded good over the last few years, it's very likely that this week, we truly arrived at that turning point.