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Blown tails saving fuel

Old 10-28-2014, 07:18 AM
  #11  
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Again, the statistical likelihood of a triple engine failure (apu too) can be determined using existing data which has to have an exceedingly low chance of that happening. I doubt that's the problem with blown aerodynamics, although porous panel contamination may introduce a new twist. We already have reliable technology for bird and ice protection, dirt contamination is just another one. Short of a massive insect swarm or volcano ash I do not see it being a major issue. Cleanliness of porous panels can be monitored using an array of pressure transducers in the air lines with automated computer monitoring for the whole thing, all the pilot sees is an abnormal message if there is one. Another thought is, if truly terrible bug swarms are a serious risk to blown aircraft, then swarm forecasting could be added as a branch of meteorological science. Flight into regions of known severe insect swarms prohibited, might be a limitation.
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Old 10-28-2014, 08:46 AM
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What if you had porous panels and somebody waxed the plane?
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Old 10-28-2014, 03:27 PM
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Originally Posted by Yoda2
What if you had porous panels and somebody waxed the plane?
What if somebody waxed the static ports?
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Old 10-28-2014, 06:35 PM
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Originally Posted by rickair7777
What if somebody waxed the static ports?
Probably not a major issue compared to others; just pulled that from the "If it can be done, it will be done" file...
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Old 10-29-2014, 06:08 AM
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Originally Posted by rickair7777
What if somebody waxed the static ports?
What if somebody duct tapes the static ports?

https://www.youtube.com/watch?v=6b-F6zNBURk

http://code7700.com/mishap_aeroperu_603.html
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Old 10-29-2014, 06:13 AM
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Someone earlier mentioned using air ducts from the leading edges to channel air to the tail. It seems to me that would be the far more reliable option and wouldn't load the crew with another system to configure correctly.
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Old 11-20-2014, 08:55 AM
  #17  
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the 787-9 has a boundary layer control on the horizontal stabilizer from a scoop on the vertical Stabilizer
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Old 12-02-2014, 09:56 AM
  #18  
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Another news clip related to this. A couple of people on this thread mentioned passive air jets or channels in contrast to a powered boundary layer enhancement system.

More Efficient Tail To Be Tested

The Smithsonian (12/1, Iozzio) interviewed Israel Wygnanski, a professor of Aerospace and Mechanical Engineering at the University of Arizona. He worked on a tail for Boeing’s test plane, the 757 ecoDemonstrator, scheduled to fly next year. It uses 37 small sweeping airjets to “help control steering at low speeds or in the event of an engine failure.” The team received a Group Achievement Award from NASA in October, and its work “could lead to smaller, lighter tails and more fuel efficiency in the coming decades.” Wygnanski said that the airjets can shrink fuel use by 30 percent.
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