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  August 2, 2019 | International, Aerospace

  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

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  June 30, 2020 | International, Aerospace

  Army Helo Market Pegged at $10 Billion

  By Jon Harper Market opportunities for the Army's helicopter fleet will average about $10 billion per year over the next decade as the service modernizes its rotary-wing assets, according to analysts. The current inventory includes UH-60 Black Hawk utility helicopters, AH-46 Apache attack helicopters, CH-47 Chinook heavy-lift helicopters and UH-72 Lakota light utility helicopters. All but the Lakota are still in production today. Meanwhile, future vertical lift is one of the Army's top three modernization priorities, and it is pursuing two new aircraft: an armed scout platform known as the future attack reconnaissance aircraft, or FARA, and the future long-range assault aircraft, or FLRAA. “The Army's effort to develop and field the next generation of vertical lift aircraft ... will have significant implications for the industrial base,” defense analysts Andrew Hunter and Rhys McCormick wrote in a recent report for the Center for Strategic and International Studies. “Projections show that although there will be a drop-off in the procurement of legacy aircraft in the mid-2020s as FARA and FLRAA full-rate production starts to ramp up, there is still a roughly $8 billion to $10 billion annual addressable Army vertical lift market over the next decade,” they said in the report titled, “Assessing the Industrial Base Implications of the Army's Future Vertical Lift Plans.” FLRAA has an estimated program value of $40 billion, while FARA could be worth about $20 billion. In March, the Army announced it had selected Bell and a Sikorsky-Boeing team for the FLRAA competitive demonstration and risk reduction effort. The winner of that phase is expected to be selected in fiscal year 2022. The service also picked Bell and Sikorsky to continue on in the competition for the future attack reconnaissance aircraft. A “flyoff” for the FARA competition is scheduled for fiscal year 2023, with a production decision expected in fiscal year 2024. Both the FARA and FLRAA platforms are slated to enter production later this decade. Meanwhile, operation and sustainment costs will remain the largest source of Army vertical lift spending over the next 10 years, according to the CSIS report. “There's going to be opportunity [for industry] in kind of the aftermarket side because even as you start to produce the new aircraft, there will still be the enduring platforms that are out” operating as next-generation helicopters come online, said Patrick Mason, head of Army program executive office aviation. “We will still need spares and certain things done within the aftermarket side as this transition would occur,” he added during a recent press briefing. “That drives so much of the supply chain.” Some observers have questioned whether the Army will have enough money to buy high-ticket FARA and FLRAA platforms at the same time given future budget projections. There is also the risk that the programs might go off the rails. “FVL isn't the only game in town, but it is by far the biggest,” Loren Thompson, a defense industry consultant and chief operating officer of the Lexington Institute think tank, wrote in a recent op-ed for Forbes. “If production of legacy rotorcraft ceases to make room for new ones and then FVL fails to deliver, industry might not have enough cash flow to sustain essential skills and suppliers.” Hunter said problems with the future vertical lift initiatives would upend the CSIS market projections. “If you were to take one of those programs out of the equation, that changes the addressable market in two significant ways,” he said. “One is, it shrinks it obviously by pulling out ... multiple billion dollars of investment throughout the 10-year window that we looked at. The other effect that it has is it reduces the competitive opportunity for industry. Right now, you know you've got multiple companies gunning for two aircraft. And even if you went down to one [program] and you were still competing, that's much less opportunity for industry to win in that scenario.” https://www.nationaldefensemagazine.org/articles/2020/6/29/army-helo-market-pegged-at-$10-billion

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  May 14, 2024 | International, Naval

  UK Navy to buy six vessels, enters new ‘golden age’ of shipbuilding

  The country also plans to give its future frigates the ability to attack land-based targets.