29 avril 2020 | International, Aérospatial
The Air Force is close to testing an experimental vertical takeoff prototype under its new program.
The first contract in the U.S. Air Force's bid to acquire flying cars has gone to a company whose design harks back to a pioneer in the field.
California-based Sabrewing Aircraft Company received a $3.25 million Phase II Small Business Innovative Research earlier this month to test its Rhaegal-B, a four-rotor craft that the company says can carry up to 5,400 pounds up to 200 knots some 1,000 nautical miles.
With its four electric rotors, two on either side of the aircraft, the 60-foot Rhaegal-B somewhat resembles the M400X Skycar from Paul Moller.
Moller is, in many ways, the Nikola Tesla of the flying car field. In the early 2000s, the Moller International Skycar became the first non-helicopter vertical takeoff and landing aircraft to actually get off the ground. The four motors would lift the car up and then swivel to propel it forward, like a V-22 Osprey. Even though the design worked, it never made it into showrooms.
“For the engine, the most critical element is power,” Moller told The Futurist magazine in 2008.
“Once you reduce the diameter of the propulsion system [making the propellor smaller] you go from a helicopter to a fan system. So you're moving less air, and the less air you move, the more power it takes to generate a certain kind of thrust. If I took a helicopter and made it one-half the diameter, I would have to immediately add 60% more power. I halve the diameter again, I have to add 60% more power, again. The M400 Skycar has over 1,000 horsepower.”
Given the high cost to power it, the M400 Skycar was impractical for most locations outside of the Middle East, where oil sheiks would use them to traverse wide distances, Moller said at the time.
Sabrewing CEO Ed De Reyes, who once worked for Moller, said his former boss was restricted by the engines of his time. The best-suited for the purpose were Wankel rotor engines, and internal combustion engines, which offered high speeds but limited torque. The electric motors that have arrived in recent years are far more promising: smaller, lighter, yet capable of producing more torque than an internal combustion engine.
The Rhaegal-B design is highly but not fully autonomous, De Reyes said. A controller will command it from a ground station, but with the sort of low-effort, push-button interface you would encounter on a Northrop Grumman Global Hawk, rather than the more hands-on piloting needed for General Atomics MQ-9 Reapers.
Something else that's come a long way since the early 2000s is the ability to detect and avoid objects in mid-air. Ssense-and-avoidance systems are a major stepping stone to more widespread use of drones in U.S. civilian airspace. A lot of drone manufacturers are hoping for the FAA's blessing for their versions.
The Rhaegal-B combines radar and nine other sensors to give the aircraft a picture of the environment around it. It can take evasive action without any human control. (In fact, humans can't override it to accidentally steer the vehicle into something else.) If communication is cut off, it can continue to its destination with no additional imput from the ground operator.
The appeal for the Air Force has to do with versatility and even detectability. During a webcast on Monday, Air Force Col. Pete White, with Air Force Warfighting Integrating Capability, said that traditional helicopters are noisy compared new vertical-lift aircraft. Thanks, in part, to the new electric motors. “Within feet of an enemy, they can't hear you,” He said that new, nimble electric air vehicles that could take off and land without a runway could help the military “maneuver around the battlefield at a pace that would be impossible today”
The Air Force says it wants flying cars to evacuate wounded soldiers from the battlefield, among other missions. That means that they could be operating under fire. De Reyes says the military version of the aircraft has a Kevlar coating to protect it from small ballistics and can operate even when one of the motors is damaged.
Air Force officials have also said that they are looking to fund and support U.S. flying-car companies, lest they migrate to China or accept lots of foreign investment. De Reyes says he's often approached by Chinese investors looking to gain a foothold in his company and other entrepreneurs in this space are as well.
Sabrewing will test the Rhaegal-B at the Air Force's Edwards Air Force Base, hoping to meet safety requirements that will clear it for more military work and perhaps even commercial use. A June flight demonstration with its prototype has been postponed due to travel restrictions
https://www.defenseone.com/technology/2020/04/flying-car-future-looks-flying-cars-past/164995
23 mai 2024 | International, C4ISR
San Diego – May 22, 2024 – General Atomics Aeronautical Systems, Inc. (GA-ASI) was awarded a $94,808,020 cost-plus-fixed-fee contract for research, development, test, and evaluation of Autonomy and Artificial Intelligence...
25 novembre 2020 | International, Aérospatial
By Anthony Capaccio Boeing Co. has been cited by the Pentagon's contracts management agency for an increase in incidents of damage to military aircraft or components at three of its facilities. The citation from Army Lieutenant General David Bassett, director of the Defense Contract Management Agency, cited “recent negative trends” in mishaps at Boeing's facilities in Seattle, San Antonio and Mesa, Arizona, “that far exceeds historical rates” and are “not consistent with expected performance.” The results could include damage from parts falling off a cart during transportation or too little overhead “clearance when maneuvering the aircraft or ground support equipment resulting in repairs needing to be made,” Matthew Montgomery, a spokesman for the contracts agency, said in an email. “Our analysis of mishaps indicates a disproportionate number of events occurring at Boeing facilities” since 2018 involving aircraft or parts damaged before delivery to the military, Bassett told Leanne Caret, chief executive officer of Boeing's defense unit, in a previously undisclosed June letter obtained by Bloomberg News. The mishaps add to other indications of challenged performance at units of Chicago-based Boeing, the No. 2 defense contractor after Lockheed Martin Corp. They include problems with parts quality for Apache AH-64 helicopters that led to a recent halt in delivery that's still in effect and a wide-ranging Army-led inspection of the Mesa facility. In addition, Boeing is still struggling to deliver a KC-46 refueling tanker that meets refueling system specifications nine years after the company won the contract. Earlier: Boeing's Arizona Chopper Plant Under Scrutiny by Army Mishaps at Boeing facilities increased from 18% of those tracked by the defense contracts agency for large aviation contractors in fiscal years 2017 and 2018 to 38% in 2019. As of June, they stood at 50%, far exceeding “levels observed in other large DoD aircraft contractors of similar scope over the same time period,” Bassett wrote. The issues included a lack of procedures, a failure to follow those in place and “inattention or supervisory factors” that “contributed to the majority of these mishaps,” Bassett wrote. Of particular concern was Boeing's Seattle facility, where 66% of the company's fiscal 2020 mishaps occurred, he wrote. Since the letter, “Boeing leadership and their employees have responded well” and “have initiated changes that should lead to better quality and mishap outcomes,” Bassett said in a statement. “We look forward to those changes demonstrating enduring improvements in quality and mishap reduction that will improve the products we receive.” Boeing spokesman Todd Blecher said the company didn't have a comment on the Bassett letter. Montgomery, the contracts agency spokesman, said that Boeing ranks in the top three of the 13 major aviation contractors tracked for reported mishaps over fiscal 2019 and 2020. “Each mishap is unique and some mishaps are still under investigation,” Montgomery said. “Some mishaps represent a failure to follow a procedure or take necessary preventative action.” During the time period reviewed, Boeing had five reportable mishaps in fiscal 2017 and four in fiscal 2018, he said. “They are currently sitting at 11 mishaps for fiscal 2020.” https://www.bloomberg.com/news/articles/2020-11-24/boeing-dinged-and-damaged-military-aircraft-pentagon-complains
27 avril 2020 | International, Aérospatial, Naval, Terrestre, C4ISR, Sécurité
By: Joe Gould WASHINGTON ― Cash flow for small defense contractors is continuing to suffer under the coronavirus pandemic, according to a survey by the National Defense Industrial Association. The survey echoes warnings from the Pentagon that these firms, part of a vast network of suppliers that makes up the defense-industrial base, are especially vulnerable. The Pentagon this week announced it will make $3 billion in new “progress payments" to increase cash flow to prime contractors, expecting the money would then trickle down. Of the NDIA survey respondents: 67 percent of companies with less than $1 million in annual revenue have seen a cash-flow disruption. 60 percent said the crisis has interfered with their cash flow. 60 percent expect to have long-term financial and cash-flow issues stemming from the crisis. 66 percent said accelerated payments from the Defense Department or prime contractors would be the most helpful step toward business recovery. L3Harris Technologies said this week it will issue more than $100 million in payments to its small suppliers. Lockheed Martin announced Friday it executed $256 million in accelerated payment toward its $450 million goal. Both of these promised followed the Pentagon's announcement this month that it will boost progress payment rates from 80 percent to 90 percent for large companies, and to 95 percent for small businesses. The payments are made to contractors, usually on a monthly basis, for costs incurred and work performed under a contract; a 90 percent rate means that if $1 million in expenses are submitted on the program, the Defense Department will reimburse $900,000. Sixty-six percent of the respondents also said it would help them to receive flexibility on the performance of their contracts. Seventy-two percent expected to avoid overruns on their firm fixed-price contracts as a result of disruptions caused by COVID-19. On Thursday, acquisitions officials with the Army said they expect costs to rise, and in response will guard against program slips and closely watch vulnerable lower-tier companies with less slack in their workforces. Pentagon officials anticipate workforce and supply chain issues will yield a three-month delay across the majority of its Major Defense Acquisition Program portfolio. “The supply chain does have some challenges, and that's probably where the vast majority of any slips would occur that are tied to individual companies,” said Bruce Jette, the Army's acquisition chief. “These companies are small, and if one person gets COVID in the company, the next thing you know you've lost 14 days with the company because everybody that didn't get it is in quarantine.” As of April 10, 769 small businesses responded to the NDIA survey. The number of companies expecting cash-flow disruptions was slightly lower last month, when 458 small businesses responded. Factoring into cash-flow problems, according to the NDIA, are cuts to billable hours, delayed payments from prime contractors and government customers, a lack of telework options or schedule flexibility in contracts, and shelter-in-place orders that prevent employees from working. Beyond revenue expectations, meeting contract obligations and access to capital are where small businesses are taking the biggest hits during the pandemic. Other areas of difficulty were workforce availability, access to secure facilities, contracting officers accessibility, clear information from the Defense Department, confidence in the supply chain, and stock and cost of materials. The technology and services sectors reported more disturbances from the crisis than the manufacturing sector, NDIA noted. And businesses with fewer than 50 employees are feeling the brunt harder than businesses with more than 500 employees. Defense Contract Management Agency data this week showed that 106 out of 10,509 primary Pentagon contractors are closed, and 68 companies closed and then reopened. Of 11,413 subcontractors, 427 were closed, with 147 having closed and reopened. https://www.defensenews.com/2020/04/24/covid-cash-crunch-still-hurting-small-defense-firms/