Free Republic

Trailing-edge noise is the dominant source of sound from aeronautical and turbine engines like those in airplanes, drones, and wind turbines. Suppressing this noise pollution is a major environmental goal for some urban areas. In Physics of Fluids, researchers from Xi'an Jiaotong University used the characteristics of owl wings to inform airfoil design and significantly reduce the trailing-edge noise. "Nocturnal owls produce about 18 decibels less noise than other birds at similar flight speeds due to their unique wing configuration," said author Xiaomin Liu. "Moreover, when the owl catches prey, the shape of the wings is also constantly changing, so...

The strange flying objects have been spotted near F.E. Warren Air Force Base in Wyoming, which houses enough nuclear intercontinental ballistic missiles to wipe out several cities. For weeks, mysterious unidentified flying objects over the Eastern Plains region of Colorado have vexed residents, law enforcement, the military, and state and federal officials. Those who see them say they appear in the night sky, often several at a time, their locations marked by the light they emit. Audibly buzzing, they hover and maneuver in precise formations. The mystery of their origin has gripped Colorado, where news of a sighting makes near-daily...

I’m as much a Sci-Fi fan as most anyone. I’ve read my fair share of Orson Scott Card books, seen all the Men in Black movies, think it’s a travesty that Firefly got canceled, and have sat through every cringy second of every lame attempt to improve on the original Star Wars trilogy, but until the past few months, I’d never seriously considered even the remotest possibility that humans may not be alone, at least on this planet and in this solar system.  But here we are, and if anything should unite humanity in an era seemingly as divided as...

Full Title: President Putin says five men killed in huge explosion in northern Russia that caused sudden radiation spike died trying to create a weapon that ‘has no equal in the world’ Russian President Vladimir Putin has told widows of the five scientists who died in a nuclear explosion earlier this year that their husbands were working on 'the most advanced and unmatched technical' weaponry. Putin's comments came during a ceremony of state decorations at the Kremlin today where he awarded the deceased employees of Russia's state nuclear company with the Order of Courage, posthumously.

the predecessor to the U.S. Air Force's iconic SR-71 Blackbird ... also incorporated then-state-of-the-art features to reduce its radar cross-section. These included a combination of a stealthy overall shape and radar-evading structures, as well as the use of composites in its construction, and the incorporation of radar absorbing materials on its skin. A far less known, but still a key component of the Skunk Works plan to make the A-12 harder to spot on radar involved a cesium-laced fuel additive to dramatically reduce the radar signature of the plane's massive engine exhausts and afterburner plumes by creating an ionizing cloud...

For decades, physicists, engineers and mathematicians have failed to explain a remarkable phenomenon in fluid mechanics: the natural tendency of turbulence in fluids to move from disordered chaos to perfectly parallel patterns of oblique turbulent bands. This transition from a state of chaotic turbulence to a highly structured pattern was observed by many scientists, but never understood. For decades, physicists, engineers and mathematicians have failed to explain a remarkable phenomenon in fluid mechanics: the natural tendency of turbulence in fluids to move from disordered chaos to perfectly parallel patterns of oblique turbulent bands. This transition from a state of chaotic...

<p>NEW YORK – Two New York residents accused of conspiring to support ISIS and plotting to set off a pressure-cooker bomb in the city have pleaded guilty to all charges against them, federal prosecutors and New York City officials said.</p>

Russia has launched five successful flights of a hypersonic jet that is capable of destroying an aircraft carrier with a single impact, according to a new report. The Zircon cruise missile travels between 3,800mph and 4,600mph - five to six times the speed of sound - and puts Russia 'half a decade' ahead of the US', the report says. This makes it faster than any anti-missile system, including those that are expected to appear in the next two decades.

On November 28, the fearless Ethiopian will make a flying debut and marry his fiance Seble Bekele the moment he lands. This will be his second attempt after he first taxied to a runway 40 kilometers but a broken propeller ruined his chance of flying. However, Asmelash Zeferu is all set with a new engine that doubles his power to 78 horsepower and has even sought professional advice for flying. Flying has always been a dream for Zeferu, since childhood he wanted to become a pilot but he had to meet with disappointment when he got to know he did...

I home school a young girl. In years past, we have gone to the local air show and done such things as measure the tops and bottom of wings and rotos and figure the ratio or difference between the area of the top of the wing versus the bottom and estimated which wings had more lift than others. We measure how much area the wheels occupied on the ground and consulted with the crew chief what the tire pressure was and calculated the weight of the plane. In years past we were able to see F18s form a vapor cone...

We've screamed for them for years. We've joked about it. We've featured them in auto insurance commercials. IBM was using the idea in their advertisements well over a decade ago. But now the flying cars are here. Flying cars aren't just science fiction anymore.Woburn, Mass.-based Terrafugia Inc. said Monday that its prototype flying car has completed its first flight, bringing the company closer to its goal of selling the flying car within the next year. The vehicle — dubbed the Transition — has two seats, four wheels and wings that fold up so it can be driven like a car....

Europe's ability to develop next-generation combat aircraft has been dangerously eroded, and will reach "a point of no return" unless collaborative funding decisions are made soon, a new industry study warns. Commissioned by the European Defence Agency (EDA), the Future Air Systems for Europe (FAS4Europe) group study says "the situation for future air systems is severe, with some important industrial capabilities and technologies already at risk". Without additional investment and a joint strategy, the situation "will soon become critical", it says, identifying the "development of future combat aircraft (manned and unmanned) and attack helicopters" as being at risk. "Europe's military...

This is the Ugandan aircraft that Africa hopes will thrust it right into the space race. Constructed amidst the rubble of his mother's backyard, ambitious Chris NSamba believes the African Skyhawk will lead to his continent launching its first astronaut into orbit. The African Space Research Programme founder has been helped by 600 volunteers in partially achieving the first stage of his dream - the creation of the plane that will penetrate the edge of space by flying at 80,000ft.

Of all the great and amazing aerobatic tricks performed at the Chico Air Show I attended last weekend, there is probably none that I was more fascinated with then a stunt performed by a pilot who stood his plane on end in the air while holding it in place.  My only problem was I forgot to record it with my video camera.  I was so enthralled by the many performances that I also never interviewed any of the performers like I wanted to.  So I decided to return on Sunday morning and see if I could catch up with...

In the cockpit of the sleek, black aircraft slung underneath the wing of the B-52 bomber, my interphone crackles. "Ah, Robert, it’s a lovely morning," says Jack Allavie, the commander of the B-52 launch aircraft. "Yes it is, Jack," I respond while running through the preflight checklist for our July 17, 1962 mission. The North American Aircraft X-15 was designed to investigate flight at hypersonic (Mach 5-plus) speeds and extremely high altitudes, and the effects of aerodynamic heating on aircraft surfaces. It was the first aircraft to fly Mach 4, Mach 5, and Mach 6—and I had the good fortune...

For some time, NASA has focused much of its limited aeronautics research budget on the blended wing-body configuration, believing it has the best chance of meeting its aggressive environmental targets for commercial aircraft entering development after 2025. These include reductions exceeding 70% in fuel burn, 75% in emissions and 71dB in airport noise compared to today's airliners. Now the agency is broadening its search to include other alternatives to the ubiquitous tube-and-wing layout. And one of those is the truss-braced wing (TBW), or strut-braced wing (SBW), a concept that allows a substantially longer span for significantly higher lift-to-drag (L/D) ratio....

The Canadian Press VANCOUVER — SNIPPET: "Khaled Nawaya, a flight instructor, was arrested by Canada Border Services agents when they found $800,000 in gold coins and other currency in his car and pockets on Oct. 6, as he crossed into Surrey, B.C., near Vancouver." SNIPPET: "He'd been living in the U.S. since he was 17 and had gained approval for permanent residency in Canada. Besides the gold, Canadian agents found a ring bearing the insignia of Hezbollah, which has been listed as a terrorist organization by the Canadian government since 2002. They also seized 9/11 conspiracy theory-themed DVDs and a...

8/27/2009 - WASHINGTON (AFNS) -- Officials in NASA's Aeronautics Research Mission Directorate will begin accepting scholarship applications on Sept. 1 for the 2010 academic year. The application deadline is Jan. 11, 2010. "These scholarships are a fantastic way to support our brightest students and encourage them to finish their education, expose them to NASA's research programs and inspire them to pursue a career in aeronautics," said Jaiwon Shin, associate administrator for the Aeronautics Research Mission Directorate at NASA Headquarters in Washington. NASA officials expect to award 20 undergraduate and five graduate scholarships to students in aeronautics or related fields. Undergraduate...

Those of us who've been dreaming of cheap personal air travel in the Buck Rogers, sci-fi jet-pack mode should turn their eyes towards Vinci, Italy on May 25. That's when Gennai Yanagisawa, inventor of the tiny GEN H-4 personal helicopter, will be taking his lightweight 165-pound whirly-gig on a demonstration flight. Why Vinci? According to the 75-year-old Yanagisawa, "Since the concept of our helicopter came from Italy, I always wanted to take a flight in the birthplace of da Vinci." Indeed, Leonardo's famous notebook drawings from 1493 show an "ornithopter" with a screw-like rotor. Like da Vinci's pioneering design,...

For those who are bored with hang-gliding or find skydiving just too dull, a Swiss airline captain has devised the ultimate aerial thrill: flying like a bird. Thanks to high technology and nerve, Yves Rossy has come closer than anyone to realising the ancient dream of soaring free, flitting through the sky, guided only by the body. As well as a crash helmet he wears a small pair of wings and four tiny jet engines. As he skims the Alps at up to 187mph (300km/h), the only thing that the former fighter pilot has come up against so far is...