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Noise Reduction Area  
User currently offlineN243NW From United States of America, joined Jul 2003, 1609 posts, RR: 20
Posted (10 years 5 months 1 week 4 days ago) and read 1760 times:

Hello all:

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Photo © Gerardo Dominguez
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Photo © Tobias Rose



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Photo © Tobias Rose
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Photo © Rotate



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Photo © Joe Pries - A.T. TEAM



I recently came across some pictures of the "noise reduction area" for engine tests at Zürich. How exactly does it work? I can see the center/centre one directs the exhaust and noise upwards, but that's all I can really tell from looking at the pictures. Could anyone offer some insight as to what's the story behind these things? How much do they help? Are there any other pictures in the d/b of these devices? At what other airports are they used? Are there different types of these devices? I'm not sure, but I think I might have seen one in an old book about 707s and the like.
Thanks in advance!
-N243NW Big grin


B-52s don't take off. They scare the ground away.
3 replies: All unread, jump to last
 
User currently offlineMxCtrlr From United States of America, joined Nov 2001, 2485 posts, RR: 36
Reply 1, posted (10 years 5 months 1 week 3 days 16 hours ago) and read 1541 times:

I've never seen anything like this before but from what I can see of this pic it appears that the exhaust from #1 & #3 is redirected through the structures leading away from the aircraft to each side. Other than that, I imagine each tube is fitted with baffles that reduce the noise level to an acceptable level. All of this is pure conjecture on my part but it sounds plausible.

MxCtrlr  Smile/happy/getting dizzy
Freight Dogs Anonymous - O.O.T.S.K.  Smokin cool



DAMN! This SUCKS! I just had to go to the next higher age bracket in my profile! :-(
User currently offlineRNOcommctr From United States of America, joined Jan 2001, 826 posts, RR: 3
Reply 2, posted (10 years 5 months 1 week 3 days ago) and read 1396 times:

Here at RNO, the Nevada Air National Guard used to have F-4's, and they sometimes used what we called a "hush house" which appears to be similar in design to what is shown in your photos. Sorry I don't know more about them.


I'm sorry, ma'am, I don't work for the airline.
User currently offlineN243NW From United States of America, joined Jul 2003, 1609 posts, RR: 20
Reply 3, posted (10 years 5 months 1 week 2 days 4 hours ago) and read 1359 times:

Thanks, MXCtrlr and RNOcommctr! Anyone know anything else?
-N243NW Big grin



B-52s don't take off. They scare the ground away.
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