Transforming war: A strategic integration of unmanned aerial systems

Sur le même sujet

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  9 juillet 2019 | International, Aérospatial

  Enhancing Unmanned Operations in Extreme Conditions with the Power of Two-Stroke

  Peter Lietz, Head of International Business Development for Hirth Engines, explains why engine manufacturers must raise the endurance bar for unmanned aerial vehicles (UAVs) to advance capabilities in extreme weather conditions. Drones have become a popular choice for various exploits, from hobbyist aerial photography to large organisations such as Amazon exploring the future of delivery services. In the same vein, governments, militaries and research groups are exploring the use of UAVs to enable highly effective monitoring of unforgiving terrains without risking manned aircraft or land-based patrols. The need for unmanned aerial systems to navigate harsh environments is vital for the maritime, military and commercial sectors. Providing reliable and to the minute information on the status of, and threats to, environments like the Arctic is crucial as governments prepare to take action against significant issues such as climate change and increases in populations. UAVs will play a crucial role in this future considering the need for operators to monitor harsh environments and difficult to reach terrains, especially rotary UAVs. Reaching inhospitable locations can present a variety of logistical challenges, not least of which is the cost of sending land-based patrols or manned aircraft often from navy ships or other maritime vessels. This is where UAVs can enable operators to safely monitor terrains in a cost-effective and efficient way to better understand complex habitats. Carrying out monitoring exercises in areas such as the Artic where there is a real risk to life can be a major challenge. Through the use of well-engineered rotary UAVs, organisations are able to perform a variety of tasks with ease. The responsibility to advance the endurance capabilities of UAVs falls on engine manufacturers. For this reason, we must continue to innovate to increase performance. Over the last few years, rotary UAVs have grown in complexity, not only in terms of the platforms themselves but also the robustness and performance of the engines they run on. As the operational requirements for UAVs grows, engine manufacturers must continually innovate to improve power-to-weight ratios, reduce emissions, and accelerate capabilities in harsh environments. For a long time, fixed-wing UAVs were considered the optimal choice for endurance and speed over their rotary counterparts. However, this is changing rapidly thanks to enhancements in engine design. Rotary UAVs are now becoming a platform of choice due to their reduced logistical footprint and the ability to take off and land in a confined or limited space, especially in maritime environments such as on-board navy ships and coastguard cutters for example. The requirement for rotary UAVs to operate in extreme temperatures such as the cold of the Arctic or the severe heat of warmer climates is essential for operators. This is where two-stroke propulsion engines play a vital role. Two-stroke applications present rotary UAV manufacturers with a range of benefits, including ease of maintenance due to less moving parts and the ability to operate on heavy fuels which are a must for corrosive marine environments. Alongside this, two-stroke powered rotary UAVs are often capable of flying missions with a full payload in extreme conditions for more than five hours without overhaul. With this as a backdrop, it is vital for UAV and engine manufacturers to accelerate the development of propulsion systems capable of operating in extreme locations around the globe. As the industry moves towards hybrid and electric propulsion new challenges will arise and it is crucial that OEMs raise the bar to power the next generation of UAVs. In order to advance the endurance and capabilities of rotary UAVs, engine manufactures must look to innovate the propulsion technology used. Electric is an increasingly popular option for commercial drones. However, electric comes with its own challenges and limitations, such as operational endurance and increased weight of the electrical motors. Considering the performance of batteries in extreme temperatures in comparison to their fuel-based counterparts, there is a long way to go before pure electric UAVs will be capable of flying extended missions in harsh terrains. Hybrid applications that utilise both a combustion engine and electric propulsion systems will provide a bridge toward the future of pure electric flight. A clear advantage for hybrid applications is improving power to weight ratios to enable increased payload capacities. Hybrid UAV applications can be used in various functions, such as: electrically powered take-off and landing with conventional engines powering horizontal flight; or powering flight using only electrical motors whilst the combustion engine acts solely as a generator. In addition, safety is a key purpose behind the pursuit of hybrid applications. For UAV manufacturers, having the ability to convert to an electric battery should the combustion engine fail could make all the difference in enabling a safe landing. Operating UAVs in extreme weather conditions reduces the chances of potential health and safety issues associated with deploying staff or manned systems into harsh environments. In addition, a further key benefit of using UAVs is enabling the deployment of cost-effective systems that perform safely in extreme locations. Ultimately, developing UAVs that can fly farther and for longer in harsh environments will require engine manufacturers to consider alternative fuel and power systems such as heavy fuel two-stroke applications. Heavy fuel is widely considered a must in the maritime industry when dealing with complex environments due to its resistance to extreme temperatures. At Hirth, pairing a robust heavy fuel combustion engine with electrical propulsion is something we are pursuing to advance the future capabilities of unmanned systems and bridge the gap to pure electric flight. For further information about Hirth's portfolio of engines, visit: http://hirthengines.com/ About Hirth Hirth Engines GmbH, based near Stuttgart, with global sales operated from Vienna, has a long pedigree in the development of propulsion systems, stretching back to The innovative company was founded by German aviation pioneer and World War I ace Helmuth Hirth, a student of US inventor Thomas Edison, and collaborator with the Wright Brothers and Zeppelin. The company has set its sights on consolidating its leading role in the development of two-stroke engines for a range of diverse sectors including:  Unmanned and manned light and experimental aircraft (fixed wing and helicopters)  Hovercraft Next generation R&D will focus on hybrid engines, based on the company's winning formula of providing easy to maintain power to weight ratio propulsion technology across civilian and military applications. https://dronescrunch.com/enhancing-unmanned-operations-in-extreme-conditions-with-the-power-of-two-stroke/

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  4 septembre 2024 | International, C4ISR

  Spain's Indra Sistemas signs $284 mln radar system deal with Poland

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  4 février 2019 | International, Aérospatial

  The US Air Force wants to continue its light-attack experiment. Will industry buy in?

  By: Valerie Insinna WASHINGTON — If the U.S. Air Force takes two years to conduct a light-attack experiment — made possible in part by industry investments — and then abandons it, why should defense contractors buy into the next one? That was the question posed to the Air Force's top uniformed acquisition official by one attendee of a Feb. 1 event held by the Air Force Association. "I think there's a skepticism out here,” said Mike Loh, a retired Air Force four-star general who now runs a consulting firm. “There's got to be a requirement or funding or both at the end of that, otherwise you've got guys in industry that are investing a lot of money, and they're looking back at light-attack aircraft,” he said. “What did you do? Nothing. You put it on the back burner.” Loh's question highlights the confusion surrounding the Air Force's path forward on the light-attack experiment, as well as unease about the way the service approaches industry investment in short-term experimentation or development campaigns with no clear contract award at the end of the process. Industry investments have already allowed the service to fly the aircraft, set up logistics infrastructure and try new capabilities Last month, Air Force officials confirmed the service would not put out a final solicitation for the light-attack program. Matt Donovan, its undersecretary, said on Jan. 18 that the service preferred to conduct additional experiments and wanted to broaden the campaign. This latest shift follows a failed attempt to acquire a light-attack plane about a decade ago. In 2009, the Air Force began the Light Attack/Armed Reconnaissance program, and its competitors — the Textron AT-6 and Sierra Nevada Corp.-Embraer A-29 Super Tucano — are the same two aircraft involved in the current experimentation campaign. That program fizzled out due to political reasons around 2013, but the Air Force is still hopeful it can press ahead with its latest light-attack effort. “I have ideas of how we go forward, and I think we know how we go forward,” Lt. Gen. Arnold Bunch, the military deputy for the Office of the Assistant Secretary of the Air Force for Acquisition, said of the light-attack experiment on Friday. ”We are planning to broaden the experimentation out and carry the experimentation forward, and I think when our budget hits, you'll understand more of what we're doing." Bunch said the experiment has helped validate the Air Force's requirement for a light-attack capability that can counter violent extremist threats in a low-cost manner. “What I don't want to do is end up in a position that I've got F-35s chasing small buses or mopeds or whatever else we may be trying to chase,” he said. But when it came down to it, Air Force officials looked at the new National Defense Strategy — which prioritizes a high-end fight — and decided against making a large-scale buy of light-attack planes in the upcoming budget, he said. The Pentagon's annual report by the director of operational test and evaluation, released Thursday, shed some light on what may have been the Air Force's initial plans for the light-attack program. The service would have purchased 359 aircraft for eight operational squadrons and three training units, with a contract for either the AT-6 or A-29 to be awarded before September, the report said. The Air Force also considered getting a waiver so that it conduct component-level, live-fire tests for both aircraft before making a final downselect. An Air Force spokeswoman confirmed to Defense News that the timeline and procurement quantities noted in the DOT&E report are no longer accurate. Expanding the experiment What becomes of the light-attack experiment remains unknown — Air Force officials haven't made it clear what the service wants to see in future stages of the effort. Air Force Chief of Staff Gen. Dave Goldfein stressed the importance of getting buy-in from international militaries during a Jan. 26 interview with Defense News. He also said aircraft like helicopters and drones could be considered in addition to the turboprop planes that dominated the first phases of the experiment. On Friday, Bunch said the service could look at “technologies we may be able to put on platforms or solutions that we may not have thought of” during the first phase of the experiment. “I know many people have talked about specific platforms. What I want to talk about [is] not necessarily that,” he said. That may point to a systems-of-systems approach similar to what the Air Force is seeking with its Advanced Battle Management System — a replacement for its JSTARS ground surveillance planes that will be comprised of a network of existing and new sensors. But the Air Force will need to be clear with industry about what it wants, said Andrew Hunter, head of the defense-industrial initiatives group at the Center for Strategic and International Studies. For example, “if the answer is that they need to do some kind of dramatic cost-cutting initiative, give them a number,” he said. It might also benefit the Air Force to incorporate prototypes in the large-scale international exercises it regularly holds with partners, which has the added benefit of giving foreign militaries more exposure to technology that the U.S. might buy, he said. “I think people will stick with it for a while because there's still a belief that the Air Force will invest and, more important, that there is still a broad international market for this capability,” Hunter said of the light-attack experiment. But, he added, the uncertainty regarding the future of the effort illustrates the constraints of rapid prototyping and experimentation: There's no promise of a program of record at the end of the road. “[While] there is some value of exercising the muscle ... not every one of these is going to lead to a production program,” he said. After two years of experimentation, the Air Force still doesn't have an answer for how it should fill its light-attack requirement, but Bunch, the acquisition official, was adamant the experiment has had value. "I may be the only one that believes it, but I actually believe it has been a success. We tried something we hadn't done. We built a partnership with industry. We experimented. We learned a lot, and we got to the point where we weren't ready to make a large buy decision at this stage. I still believe that is learning,” Bunch said. “And I believe it is something we will take the lessons learned and roll it into how we go forward,” he added. “We've got to look at ourselves in the mirror and say: ‘Was that good or was it bad, and how do we do it better?' We've got to do our own image check." https://www.defensenews.com/air/2019/02/01/the-us-air-force-wants-to-continue-its-light-attack-experiment-will-industry-buy-in