Aerodynamics

April 1, 2013 - 12:30am
Air blown through small holes in the blade makes dynamic stall less severe in demanding maneuvers, according to researchers at DLR.

Researchers at the German Aerospace Center (DLR) in Göttingen may have discovered a way to make helicopters more maneuverable, by reducing the dynamic load on the rotor head control rods.

During rapid forward flight or maneuvering, airflow stalls on the main rotor blade as it retreats (moves backwards), giving rise to a “dynamic stall” and subjecting the rotor head control rods to formidable dynamic loads.

March 20, 2013 - 1:50pm

The FAA is adopting an airworthiness directive (AD) for the Cessna 750 Citation X prompted by reports of loss of displayed airspeed.

March 13, 2013 - 1:20pm

TAG Aviation can now help its aircraft maintenance clients benefit from a supplemental type certificate that the European Aviation Safety Agency has granted for installation of high-Mach blended winglets for the Falcon 2000/2000EX and 900. TAG installs the winglets, made by Aviation Partners, at its Geneva Airport facility.

March 6, 2013 - 12:00pm

The NTSB is faulting the pilot of a Bell 206 that crashed into New York’s East River in 2011, killing three of the four passengers after it experienced an apparent loss of tail rotor effectiveness (LTE).

March 4, 2013 - 2:35am
Magenta hoops on the upper PFD section depict the Xavion-determined flight path. The airports are color-coded, indicating reachable airports.

If your engine or engines suddenly quit, could you glide safely to the end of a runway? If that does happen, an iPad/iPhone app called Xavion can help point the way to a safe landing in any weather.

Xavion is the latest product from X-Plane simulator developer Austin Meyer’s Laminar Research. The company tested Xavion extensively on X-Plane and used the simulations to hone the program’s algorithms. A side benefit is that you can run Xavion on X-Plane to practice before trying it in a real airplane.

February 21, 2013 - 3:15pm

Aerion has started its next round of high-speed test flights, in conjunction with NASA Dryden Flight Research Center, to validate the laminar-flow wing for its supersonic business jet. These tests, using a test article mounted under the centerline of NASA’s F-15B research aircraft and flown at speeds up to Mach 2.0, are intended to measure the real-world robustness of supersonic natural laminar flow. Information from these tests will help define manufacturing standards for surface quality and assembly tolerances of the proposed SSBJ’s laminar-flow wing.

February 4, 2013 - 3:25pm

The FAA recently published a notice to operators, training managers and inspectors of the importance of AC 120-109, to reinforce the importance of adequate flight crew training on the use of aircraft stick shakers and pushers. The increased emphasis was the result of a September 2010 Aviation Rulemaking Committee (ARC) to stem the numbers of loss-of-control accidents due to pilot unfamiliarity with stick pushers, as well as flight into icing and wind-shear conditions.

January 29, 2013 - 9:29am
On a business jet, seconds count (or do they?)

“No traditional business jet will take you closer to the speed of sound,” promises Gulfstream in an announcement about its recently certified G650, which boasts a maximum velocity of Mach 0.925.

January 24, 2013 - 3:30pm

Former Cessna chairman and CEO Jack Pelton is among a half-dozen veteran business and military aviation executives who have joined forces to offer remanufactured turbine-powered aircraft to the aviation and defense industries. The newly formed company, The Aviation Alliance, also announced its first business aviation offering yesterday: the Excalibur 421.

January 8, 2013 - 3:20pm

Aerion, which aims to develop a supersonic business jet, promoted Doug Nichols to CEO yesterday. Nichols, who was previously COO at the company, also joined Aerion’s board of directors. In his new capacity he is responsible for all corporate activities of Aerion, including its recently acquired Desktop Aeronautics aerospace software and consultancy subsidiary based in Palo Alto, Calif. “Doug’s promotion…will allow an increasingly vertically integrated Aerion to expand and monetize its portfolio of transonic and supersonic intellectual property,” said Robert M.

 
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