US announces first batch of Ukraine aid since pivot on Russia strikes

Sur le même sujet

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  25 avril 2024 | International, Aérospatial

  US Army to field long-range combat aircraft to first unit in FY31

  The program's schedule is behind by a year following Lockheed Martin's protest over the Army's decision to choose Bell's offering.

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  21 janvier 2020 | International, Aérospatial

  Technical Failure or Unrealistic Expectations? Report Shows U.K. Police Drones Fall in Heavy Rains

  Whether technical failure or simply unrealistic expectations, a new report published in the U.K. indicates that the DJI Matrice Series drones fall during heavy rains. As reported by CNN, the U.K.'s Air Accidents Investigation Branch (AAIB) found that 16 DJI Matrice 200 series drones crashed due to “technical failures” while flying in the rain. This month's AAIB bulletin reports on one specific incident that took place in a flight over a sporting event: The DJI Matrice 210 small unmanned aircraft was being operated commercially to record video footage of an outdoor athletics event. The pilot started to position the aircraft back towards the landing site due to an increase in the rainfall. The pilot then saw the aircraft“wobble” slightly and as it neared the landing site it flipped over before descending rapidly to the ground from a height of about 3 m (10 ft). No one was injured. During the accident flightthe aircraft had been operating at heights of up to about 30 m (100 ft) near to, and above people on the ground. This investigation reviewed other similar accidents and the risk of injury to people on the ground. It's important to note that the professional pilot handled the situation correctly and according to protocol – and as a result, his aircraft was damaged but there were no injuries or issues with the spectators or participants in the event. The event began in light rain, but, as can happen in the U.K., a drizzle became a downpour. In a statement to CNN, DJI reiterated that safety is a priority: “The DJI Matrice 200 Series has been independently certified by a third party that it has an IP43 rating,” it said. “This certifies that ‘water falling as a spray at any angle up to 60° from the vertical shall have no harmful effect'. However, the M200 is not suitable, and should not, be operated in conditions or precipitation greater than those stated by the certification. “All users of M200 series drones should refer to our current maintenance guidelines and safety information here to help manage their aircraft and maximise flight safety.” The problem may not be as much about a “failure,” which implies the unexpected, as it is one of unrealistic expectations. Much of the advantage of an sUAS is in its small form factor. While the technical capabilities of drones have increased over the last several years, and commercial drones can now maintain stability in a wider range of environments, they aren't airplanes and they aren't designed to be flown in all weather conditions – including a downpour. https://dronelife.com/2020/01/17/technical-failure-or-unrealistic-expectations-report-shows-u-k-police-drones-fall-in-heavy-rains/

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  8 mai 2019 | International, Naval

  The US Navy is eyeing a big change to its new stealth destroyers

  By: David B. Larter NATIONAL HARBOR, Md. — The U.S. Navy is considering a significant change to its new stealth destroyers, one driven by the change of mission announced in last year's budget documents, the head of the program said May 7 at the Sea-Air-Space conference. The service has been struggling to find a use for the ship's advanced gun system — the largest of its type fielded by the service since World War II — and now is considering stripping them off the platform entirely, said Capt. Kevin Smith, the DDG-1000 program manager at Program Executive Officer Ships. The Navy sidelined the guns after the service truncated the buy to just three ships, and after the ammunition, called the Long-Range Land-Attack Projectile, ballooned in price to more than $800,000 per round. "The guns are in layup,” Smith said. “We're waiting for that bullet to come around that will give us the most range possible. But given that that is offensive surface strike, we're going to look at other capabilities potentially that we could use in that volume.” The ships shifted missions from land attack to ship-hunting and -killing last year. The Navy is integrating the SM-6 missile, which has a surface-attack mode, and are integrating the maritime strike Tomahawk to fill out the new capabilities. In April testimony, the Navy's top requirements officer, Vice Adm. William Merz, told Congress that the slow development of the Advanced Gun System was holding back the Zumwalt. “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.” The Navy has touted the ship's excess space, weight, power and cooling as advantages the service would want throughout the ship's life. Everything from directed energy and electromagnetic rail guns to electronic warfare equipment has been floated as add-ons to the Zumwalt-class destroyers. The Navy got in its present pickle with the 155mm/.62-caliber gun with automated magazine and handling system because the service cut the buy from 28 ships, to seven, and finally to three. The AGS was developed specifically for the Zumwalt class, as was the LRLAP round it was intended to shoot. There was no backup plan, so when the buy went from 28 to three, the costs remained static, driving the price of the rounds through the roof. The program itself is coming along, said Smith. The Zumwalt is going through trials as its combat system installation wraps up; the Michael Monsoor is heading into the yards for its combat system installation; and the Lyndon B. Johnson is nearly 85 percent complete. The remaining work on Johnson involves running cables, painting spaces and otherwise putting the finishing touches on the ship. The ship will then leave Bath, Maine, and head toward its home port of San Diego, California. “We're going to energize high voltage in September, lighting off the generators in the spring, then we'll be going to test and activation for the [hull, mechanical and electrical systems], trials in the fall, then delivery.” https://www.defensenews.com/digital-show-dailies/navy-league/2019/05/07/the-us-navy-is-eyeing-a-big-change-to-its-new-stealth-destroyers