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Lawn Mower Noise On Takeoff?  
User currently offlineCory6188 From United States of America, joined Feb 2004, 2686 posts, RR: 6
Posted (8 years 12 months 2 days 19 hours ago) and read 1639 times:

I noticed an odd sound coming from the engines of the CO 738 and 752 that I was on going to and from PVR, respectively.

Right after takeoff, a noise that could only be described as similar to a lawn mower began in the engines, and it did not quit until we were at crusing altitude. Could anyone explain to me what it is that I was hearing? I noticed this noise to be especially prominent when we flew on B6 last year, but I heard it for the first time on CO in April.

Thanks for the info!

4 replies: All unread, jump to last
 
User currently offlineGoboeing From United States of America, joined Jun 2000, 2630 posts, RR: 12
Reply 1, posted (8 years 12 months 2 days 18 hours ago) and read 1613 times:

Search for "buzz saw" and "engine noise" in the tech/ops archives. There have been some discussions of this before. It depends on the type of engine. I have heard it on SWA planes as well as others.

Nick

User currently offlineYWG From Canada, joined Feb 2001, 1140 posts, RR: 2
Reply 2, posted (8 years 12 months 1 day 23 hours ago) and read 1384 times:

I believe the engine sounds have to do with where exactly you sit in comparison to the engines position. I took 'the dopler effect' in gr12 physics last semester...and I believe this has a small part in it.

It's just the way the sound waves are compressed and meet with your head.

Blair


Contact Winnipeg center now on 134.4, good day.
User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 3, posted (8 years 12 months 1 day 23 hours ago) and read 1379 times:

You gotta love "cut-and-paste"

The noise to which you refer is most likely the sound generated by the blade tips of the engine fan at high rpm with a relatively low impact airspeed as the plane accelerates. The sound fades as the plane reaches cruise speed and the throttles are pulled back.

And to all you high techies that is an extremely oversimplified explanation and was intentionally so...


One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
User currently offlineTomFoolery From Austria, joined Jan 2004, 492 posts, RR: 2
Reply 4, posted (8 years 12 months 1 day 2 hours ago) and read 1296 times:

That is the sound of innocent air particles being beat into submission by the fans.



TF


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