US Air Force plans to award Next Generation Air Dominance deal in 2024

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  11 novembre 2019 | International, Aérospatial

  UAE cleared for CH-47F Chinook buy

  By: Aaron Mehta and Jen Judson WASHINGTON — The U.S. State Department has cleared the United Arab Emirates to purchase 10 CH-47F Chinook cargo helicopters, with an estimated price tag of $830.3 million. The potential deal was announced Thursday on the website of the Defense Security Cooperation Agency, or DSCA. Such notifications are not guarantees of final sale; should the request be approved by Congress, quantities and dollar figures can change during negotiations. This request represents the 10th Foreign Military Sales request from the UAE since the start of fiscal 2017, for a total approximate worth of $10.5 billion. It is also the first Foreign Military Financing request cleared by the DSCA since the Trump administration declared a regional emergency in order to get several weapons packages pushed through Congress despite opposition on Capitol Hill, leading to bipartisan criticism of the move. The UAE bought its first lot of CH-47Fs — 16 aircraft for estimated total of $2 billion — in 2009. Boeing said earlier this year that it was relying on foreign military sales, including “30 helicopters or less” to the UAE, to shore up a delta between the production of its Block I version of the F-model and its Block II version. The company needs FMS deals like the one with the UAE even more now that the U.S. Army is planning not to buy the Block II version for the active force. The service still plans to produce Block II aircraft for Army special operators. Top Army officials have said they are working hard to mint FMS deals to help make up for the huge production gap left open following the service's decision to not buy Block II F-models for the active force. But Boeing told Defense News that it expected FMS deals would not lessen the blow and, so far, none of the anticipated sales are for Block II versions. The UAE's order, according to Boeing, was not for Block II, and the only other possible F-model sale to the United Kingdom is for extended range versions of the Block I version. It is unclear which countries might actually be interested in Block II aircraft, but the service won't be ready to offer those to foreign customers until after the variant's qualification testing is completed in 2021. The proposed sale “will expand the UAE's helicopter fleet,” per the DSCA announcement. “Further, it will enhance the UAE's operational and defensive capabilities to better defend U.S. and UAE national security interests in the region, and increase the UAE's contributions to any future joint or coalition efforts requiring helicopter support.” In addition to the helicopters themselves, the proposed package would include 26 T55-GA-714A engines; 24 embedded global positioning systems with inertial navigation system; 20 M134D-H mini-guns; and 20 M240H machine guns, as well as various transmitters and other equipment. Up to 10 U.S. government or contractor representatives will be needed in the UAE to help prepare the Chinooks for operations. Primary work will be done at Boeing's Ridley Park, Pennsylvania, facility, Honeywell Engine's Phoenix, Arizona, location, and Science and Engineering Services in Huntsville, Alabama. https://www.defensenews.com/global/mideast-africa/2019/11/08/uae-cleared-for-ch-47f-chinook-buy/

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  1 août 2023 | International, Aérospatial, C4ISR, Sécurité, Autre défense

  How Taiwan plans to counter drones by mid-2024

  Taiwan is trying to accelerate the development and production of military drones and countermeasures by expanding two national defense programs.

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  2 août 2019 | International, Aérospatial

  European Hypersonic Cruise Passenger Study Set For New Tests

  By Guy Norris A team of European hypersonic researchers are preparing for wind tunnel tests of a Mach 8 concept that is designed to prove technologies for the development of future ultra-long-range, high-speed commercial vehicles and air-breathing space launch systems. Funded under Europe's Horizon 2020 research and innovation program, Stratofly (Stratospheric Flying Opportunities for High-speed Propulsion Concepts) is targeted at fostering hypersonic capabilities for a 300-seat passenger vehicle cruising above 30 km (19 mi.) to TRL (technology readiness level) 6 by 2035. The project builds on the Lapcat waverider concept developed under earlier programs by the European Space Agency/European Space Research and Technology Center. Using the 310-ft.-long Lapcat II MR2.4 version as a reference vehicle, the 30-month Stratofly effort is focused on classic hypersonic technology challenges such as propulsion integration, hot structures and thermal management. In addition, with environmental concerns at the forefront in Europe, the project also includes sustainability considerations such as fuel-burn efficiency, noise and emissions reductions, as well as operational issues such as life-cycle costs, safety and certification. Coordinated by The Polytechnic University of Turin, Italy, the project team believes that sustainable hypersonic travel is feasible through the use of liquid hydrogen fuel and new trajectories that would enable flights from Europe to Australia in 3 hr. Specific targets include 75-100% CO2 reductions per passenger kilometer and 90% reductions in nitrous oxide (NOx) compared to current long-range transport aircraft. A version of the vehicle could also be adapted into the first stage of a two-stage-to-orbit space launch system, says the group. Other members of the 10-strong consortium include the von Karman Institute for Fluid Dynamics in Belgium, which is focused on propulsion and noise; the Netherlands Aerospace Center, NLR, which is also part of the noise study; and CIRA, the Italian aerospace research center, which is conducting high-speed flow analysis. Propulsion systems and climate impact input is provided by Germany's DLR research organization, while ONERA, the French aerospace research center, is focused on emissions as well as plasma-assisted combustion in the vehicle's combined-cycle propulsion system. Sweden's FOI defense research agency is also part of the plasma combustion study. The French National Center for Scientific Research is also evaluating the vehicle's potential climate impact, particularly in areas such as the effects of water droplets from the exhaust in the upper atmosphere. Studies of the overall business plan, human factors and hypersonic traffic management are being conducted by the Hamburg University of Technology, while the Spain-based Civil Engineering Foundation of Galicia is focused on structural analysis and optimization. Like the original Lapcat design, the Stratofly MR3 waverider configuration is dominated by a large elliptical inlet and an integrated nozzle aft located between two canted tail fins. For takeoff and acceleration up to Mach 4.5, the vehicle is powered by six air turbo ramjets (ATR, also known as air turbo rockets) in two bays of three, each fed by secondary inlets in the primary intake. Above this speed, sliding ramps cover the ATR inlets as the vehicle accelerates and transitions to a dual-mode ramjet/scramjet (DMR) for the next phase of the flight. The DMR is housed in the dorsal section, nested between the ATR ramjets, and is designed to operate in ramjet mode to above Mach 5 and scramjet mode up to Mach 8. The scramjet will incorporate a plasma-assisted combustion system to maintain the stability of the flame front and prevent the potential for flameouts. Tests of the plasma system in a combustor will take place later this year at ONERA, where supersonic combustion testing also took place for Lapcat. The tests will be conducted in November-December at ONERA's ATD5 facility and will focus on inlet conditions at Mach 3.7. Also planned for later this year is a test of the full vehicle in the high-enthalpy wind tunnel at DLR's Gottingen research facility. Testing at DLR will run through September 2020 and is expected to target similar free-stream conditions as those tested on Lapcat II—around Mach 7.8. The work will assess aerothermodynamic characteristics and be used to validate the results of earlier computational fluid dynamics analysis of the MR3 design, which incorporates external and internal differences against the reference vehicle. “We elevated the canard [a retractable feature for lower-speed flight] and redesigned the vertical tails,” says Davide Ferretto, a research assistant on the Stratofly team from The Polytechnic University of Turin. “We also redesigned the leading-edge radius of the inlet for increased efficiency as it feeds both propulsion systems.” As part of the redesign, the enclosed passenger compartment, which was divided into two sections running along each side of the vehicle, has been combined into a single cabin in the lower lobe of the fuselage. https://aviationweek.com/propulsion/european-hypersonic-cruise-passenger-study-set-new-tests