Results from these tests suggested future aircraft designers may be able to scale down the size of the vertical tail by about 17 percent and reduce fuel usage by as much as 0.5 percent, which quickly adds up to big savings.
In this photo taken from a chase plane, the Boeing ecoDemonstrator 757 flight test airplane –with NASA’s Active Flow Control technology installed on the tail — makes a final approach to King County Boeing Field in Seattle, Washington. Image credit: Boeing/John D. Parker
By World News Report Bureau
For the Active Flow Control Enhanced Vertical Tail Flight Experiment on board the ecoDemonstrator 757, 31 tiny devices called sweeping jet actuators were installed on the aircraft’s vertical tail to see what – if any – effect they have on the aerodynamics of the tail and rudder surfaces. In the photo, white tufts pepper the side of the tail on which the actuators are installed; the tufts help researchers visualize the flow of air.
The job of an airplane’s vertical tail is to provide stability and directional control during takeoff and landing. The possible future benefit of the active flow control work is that the technology could take over some of the work provided now by the tail’s size. “If we can control the flow of air over the vertical tail on demand, we believe we can provide enough side force during take-off and landing that aircraft manufacturers can safely make the tail smaller,” said Mike Alexander, lead systems engineer for the flight tests at NASA’s Langley Research Center in Hampton, Virginia. “The ability to reduce the size of the vertical tail would reduce weight and drag and decrease fuel consumption and emissions.”
The ecoDemonstrator made six roundtrip flights April 9-15 between Boeing Field in Seattle and the Strait of Juan de Fuca. The active flow control technology was tested in a variety of configurations and flight conditions, including simulated engine failures. “Initial flight test results seem to validate the wind tunnel testing we did with a Boeing 757 tail that was outfitted with this same active flow control system. But we still have a lot more analysis to do,” said John Lin, active flow control experiment principal investigator at Langley.
Wind-tunnel tests of the same technology were performed late in 2013 at the National Full-Scale Aerodynamic Complex at NASA’s Ames Research Center in Moffett Field, California. Results from these tests suggested future aircraft designers may be able to scale down the size of the vertical tail by about 17 percent and reduce fuel usage by as much as 0.5 percent, which quickly adds up to big savings.
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Wagah Border between India and Pakistan
China and Russia share common border with as many as 14 countries. China: Afghanistan (76 km); Bhutan (470 km); India (3,380 km); Kazakhstan (1,533 km); North Korea (1,416 km); Kyrgyzstan (858 km); Laos (423 km); Mongolia (4,673 km); Myanmar (2,185 km); Nepal (1,236 km); Pakistan (523 km); Russia (3,645 km); Tajikistan (414 km); and Vietnam (1,281 km).
Russia: Azerbaijan (284 km); Belarus (959 km); China (3,645 km); Estonia (294 km); Finland (1,313 km); Georgia (723 km); Kazakhstan (6,846 km); North Korea (19 km); Latvia (217 km); Lithuania (227 km); Mongolia (3,441 km); Norway (167 km); Poland (206 km); and Ukraine (1,576 km).
Next, Brazil shares borders with ten countries while Sudan and Democratic Republic of Congo have nine.
On the other hand Sri Lanka shares only has maritime borders with the Maldives and India while Denmark has borders with Sweden and Norway by sea; Canada has sea boundaries with Denmark and France
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