November 25, 2019 | International, Aerospace
The U.S. government is pushing into hypersonic weapons in a big way, with at least five different weapons programs currently in development. Nanotechnology is shaping up to be a key tech that will enable delivery systems to survive traveling through the atmosphere at Mach 5 and above, with carbon nanotubes showing promise as strong, lightweight material that rapidly sheds heat.
Hypersonic weapons are weapons that travel at incredible speeds through the atmosphere. Hypersonics start at Mach 5 (3,836 miles an hour), or five times the speed of sound. Pushing an object through the air at really, really fast speeds creates a unique problem: as speed increases, the friction from the object passing through air also increases.
This friction generates heat. The skin of the SR-71 Blackbird strategic reconnaissance jet and the fasted manned airplane ever built regularly warmed to up to 500 degrees Fahrenheit at Mach 3. The X-15 rocket plane, flown during the 1960s, reached temperatures of 1200 Fahrenheit as it flew to Mach 6. At Mach 10, the friction is enough to “melt the toughest steel,” while at Mach 20, the temperature reaches an astounding 17,000 Fahrenheit. Eventually, hypersonic weapons could reach Mach 24.
Scientists and engineers understand how to handle traditional air friction problems thanks to the technical challenges of spacecraft and nuclear warheads re-entering the atmosphere. But a missile warhead de-orbiting over an enemy target is only exposed to heat for a handful of minutes, as it transitions from space to the atmosphere and finally smashes into its target. A hypersonic weapon, on the other hand, spends its entire flight within the atmosphere and is exposed to high heat the entire time.
An article at DefenseOne describes how scientists are working with carbon nanotubes to solve the heat issue. Scientists at Florida State University's High-Performance Materials Institute are looking into using carbon nanotubes as a construction material for hypersonic weapons. Carbon nanotubes are a synthetic material consisting of carbon tubes with a diameter as small as one nanometer. Carbon nanotubes are stronger than steel and insulate against heat. Now, researchers have discovered that soaking carbon nanotubes in phenol can increase their ability to disperse heat by one-sixth, allowing less nanomaterials to be used for the same job.
What does this mean for hypersonic weapons? It means that materials that can stand the heat and stresses of hypersonic, atmospheric travel are on the way, and that hypersonic weapon designers could even safely achieve higher speeds by using thicker layers of the stuff.
https://www.popularmechanics.com/military/research/a29847271/us-military-nanotech/
July 29, 2021 | International, Aerospace
The unveiling of the light, single-engine aircraft comes amid the country’s current work on the Su-57, a heavy fighter jet also developed by Sukhoi.
July 29, 2019 | International, Aerospace
For the first time, No. 36 Squadron (36SQN) has worked to get United States Air Force (USAF) C-17A Globemasters back into the air under a new cross-servicing arrangement. Technicians from 36SQN were able to assist the crews of two USAF C-17As on separate tasks in Australia. The work came following both countries agreeing to a C-17A Aircraft Repair and Maintenance Service - Implementing Arrangement (ARMS-IA), which allows RAAF and USAF technicians to work on each other's C-17As. On 4 July , ARMS-IA was enacted to help support a USAF C-17A at RAAF Base Richmond. Warrant Officer (WOFF) Pete Ranson, Warrant Officer Engineering at 36SQN, said the request for assistance came via the Boeing Defence Australia representatives at RAAF Base Amberley. “We supplied a co-pilot Multi-Function Control Panel for the cockpit, fitted it and carried out the associated operational checks to verify the replacement,” WOFF Ranson said. “After that rectification, another unserviceability appeared, and was successfully rectified.” This issue related to a Secondary Flight Control Computer, and saw 36SQN engage fellow RAAF technicians at 37SQN for tooling and consumables. Throughout the repair on the USAF C-17A, RAAF and USAF technicians worked side-by-side. “The issues with the affected aircraft were outside the expertise of the USAF maintenance personnel on that task,” WOFF Ranson said. “The USAF aviation technician trades are more specialised than the RAAF, where we stream to either Aircraft Technician or Avionics Technician.” “We carry a broader experience in a range of tasks, and 36SQN maintenance personnel were able to guide the USAF counterparts in rectifying the jet.” The fix at RAAF Base Richmond came just days after 36SQN technicians assisted another USAF C-17A with a suspected fuel leak fault at Rockhampton. “On that occasion, we sent maintenance personnel to troubleshoot the problem,” WOFF Ranson said. “We found it was a faulty valve and not a fuel leak from the tank, which gave confidence to the USAF crew that they could carry on to an appropriate location to replace the valve.” Group Captain (GPCAPT) Steve Pesce, Officer Commanding No. 86 Wing, said the work of 36SQN technicians had immediately validated the ARMS-IA. “The ARMS-IA recognised the close relationship between RAAF and USAF C-17A communities, and the reality that we operate this aircraft a long way from home,” GPCAPT Pesce said. “Both of these examples witnessed a C-17A getting back on a task much sooner than would have been otherwise possible, which is invaluable support.” “I am very proud of the 36SQN team for the assistance it's rendered to its USAF counterparts.” https://www.jber.jb.mil/News/News-Articles/Article/1917908/royal-australian-air-force-and-us-air-force-technicians-on-the-tools-together/source/GovD/
January 14, 2022 | International, Aerospace
The contract, valued at up to $60 million, will help fast-track critical design and development initiatives on Boom Supersonic's Overture aircraft.