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kach22i
Aug3-07, 10:52 AM
FYI:

Boeing makes 'quiet' advances
Noise-reduction efforts pay off at remote airfield in Montana

By JAMES WALLACE
SEATTLE POST-INTELLIGENCER AEROSPACE REPORTER
http://seattlepi.nwsource.com/business/236095_quietjet11.html
During tests at the Glasgow site with a 777 in 2001, Boeing found that two engines equipped with chevrons made no more noise than a single engine without the chevron.

Photo Caption:
Technology being tested on this Boeing 777 in Montana is expected to find its way into 787s, due to enter service in 2008, and the 747 Advanced. (August 11, 2005)

Credit: James Wallace/Seattle Post-Intelligencer
kach22i
Aug3-07, 02:59 PM
A couple of smart guys in this other forum seem to have a pretty good idea how this all works.

LINK:
http://forums.pelicanparts.com/showthread.php?t=360271

In another forum I'm helping someone redesign their hovercraft.:cool:

http://www.hoverclubofamerica.org/forum/index.php?showtopic=1295
http://i184.photobucket.com/albums/x295/kach22i/MISC/Scott-H3.jpg
minger
Aug7-07, 02:55 PM
It's not as simple as they say. If you look at the actual research, many different chevon styles and configurations were used. Some produced 'more' noise than baseline, some produced the same, some produced less.
kach22i
Aug7-07, 03:14 PM
It's not as simple as they say. If you look at the actual research, many different chevon styles and configurations were used. Some produced 'more' noise than baseline, some produced the same, some produced less.
Please provide a link to that reseach if possible.

This link looks interesting, lots of pretty charts and pictures.

http://adg.stanford.edu/aa241/noise/noise.html
minger
Aug8-07, 03:46 PM
My graduate adviser works at Glenn. He's been keeping us up to date on this work. I don't have any raw data, just what he's been telling us.

From what he says though, the results are very interesting and many times unexpected.
kach22i
Aug9-07, 08:33 AM
Don't get anyone fired.
FredGarvin
Aug9-07, 09:30 AM
Coincidentally, I will be at the very same facility tomorrow for some of the same testing we are going to be undertaking.
kach22i
Aug10-07, 08:07 AM
Coincidentally, I will be at the very same facility tomorrow for some of the same testing we are going to be undertaking.

I'm guessing they will make you check in your camera phone at the front desk.:cool: