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Interior Buzzsaw Sounds (Read 1316 times)
May 13th, 2012 at 11:06am

ilikerio   Offline
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R/C flying, plastic/paper
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Coral Springs, Florida

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When you sit behind the engine in for example a 757, will you still hear the buzzsaw as when you sit in front?  Huh Thanks!
 
This... Is Rio.
...
Loud and talkative Bengal cat. He's not ours; his owner lives two houses down, but he wanders around the neighborhood getting food and talking to his human friends. He'll sometimes get into a fight if he meets another cat though... But it's rare because he's kicked out all other cats in the neighborhood. He thinks all the houses are his too...
I came up with the name "ilikerio" way back in 4th grade, and I've used it with most user accounts ever since.
My group of close friends and I have named ourselves The Rio Group. ilikerio Productions is the media branch, located here: http://www.youtube.com/user/ilikerio
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Reply #1 - May 13th, 2012 at 11:43am

skoker   Offline
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Jordan never wore his
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Simple answer, no...

Compare these with same camera and videographer

http://www.youtube.com/watch?v=XXewTuW0lpU

http://www.youtube.com/watch?v=V30hvar0o_8
 

...
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Reply #2 - May 13th, 2012 at 7:20pm

DaveSims   Offline
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Clear Lake, Iowa

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737NGs have the same issue.  We once paid to upgrade on AirTran so we could be more comfortable and get some sleep, but it was too loud.
 
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Reply #3 - May 13th, 2012 at 10:39pm

expat   Offline
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skoker wrote on May 13th, 2012 at 11:43am:
Simple answer, no...

Compare these with same camera and videographer

http://www.youtube.com/watch?v=XXewTuW0lpU

http://www.youtube.com/watch?v=V30hvar0o_8


You cannot compare the two videos. This noise is caused when the engine is at or close to max power setting due to temperature or loading. The vast majority of take offs are reduced power take offs to save engine life. No two aircraft will or are unlikely to choose the same take off power setting for the a fore mentioned reason.

Matt
 
PETA ... People Eating Tasty Animals.

B1 Boeing 737-800 and Dash8 Q-400
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Reply #4 - May 14th, 2012 at 4:12pm

ilikerio   Offline
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Coral Springs, Florida

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I just wanted to know because we're flying in December... I'll just find out when we go.

BTW we're sitting right above the engine, not in front or behind.  Tongue
 
This... Is Rio.
...
Loud and talkative Bengal cat. He's not ours; his owner lives two houses down, but he wanders around the neighborhood getting food and talking to his human friends. He'll sometimes get into a fight if he meets another cat though... But it's rare because he's kicked out all other cats in the neighborhood. He thinks all the houses are his too...
I came up with the name "ilikerio" way back in 4th grade, and I've used it with most user accounts ever since.
My group of close friends and I have named ourselves The Rio Group. ilikerio Productions is the media branch, located here: http://www.youtube.com/user/ilikerio
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Reply #5 - May 15th, 2012 at 9:02pm

skoker   Offline
Colonel
Jordan never wore his
safety goggles...
1G3

Gender: male
 Posts: 4611
 *****
 
expat wrote on May 13th, 2012 at 10:39pm:
skoker wrote on May 13th, 2012 at 11:43am:
Simple answer, no...

Compare these with same camera and videographer

http://www.youtube.com/watch?v=XXewTuW0lpU

http://www.youtube.com/watch?v=V30hvar0o_8


You cannot compare the two videos. This noise is caused when the engine is at or close to max power setting due to temperature or loading. The vast majority of take offs are reduced power take offs to save engine life. No two aircraft will or are unlikely to choose the same take off power setting for the a fore mentioned reason.

Matt

It still proves the point however.  You will always get a Buzzsaw in front of the engine while having a rumble behind, power setting dependent.  Compare virtually any takeoff video of being in front of the wing vs behind and you will get the same results. Wink
 

...
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Reply #6 - May 15th, 2012 at 10:43pm

expat   Offline
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Deep behind enemy lines!

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skoker wrote on May 15th, 2012 at 9:02pm:
expat wrote on May 13th, 2012 at 10:39pm:
skoker wrote on May 13th, 2012 at 11:43am:
Simple answer, no...

Compare these with same camera and videographer

http://www.youtube.com/watch?v=XXewTuW0lpU

http://www.youtube.com/watch?v=V30hvar0o_8


You cannot compare the two videos. This noise is caused when the engine is at or close to max power setting due to temperature or loading. The vast majority of take offs are reduced power take offs to save engine life. No two aircraft will or are unlikely to choose the same take off power setting for the a fore mentioned reason.

Matt

It still proves the point however.  You will always get a Buzzsaw in front of the engine while having a rumble behind, power setting dependent.  Compare virtually any takeoff video of being in front of the wing vs behind and you will get the same results. Wink


Look at the weather in said videos. It is for the most part sunny and hot. Find a video of a take off on a day when it is cold and wet, you are most likely not to hear this sound.

Matt
 
PETA ... People Eating Tasty Animals.

B1 Boeing 737-800 and Dash8 Q-400
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Reply #7 - May 15th, 2012 at 11:01pm

skoker   Offline
Colonel
Jordan never wore his
safety goggles...
1G3

Gender: male
 Posts: 4611
 *****
 
expat wrote on May 15th, 2012 at 10:43pm:
Look at the weather in said videos. It is for the most part sunny and hot. Find a video of a take off on a day when it is cold and wet, you are most likely not to hear this sound.

Um...

http://www.youtube.com/watch?v=knIDhewHxOo

http://www.youtube.com/watch?v=DmCJpQ-rQYc

http://www.youtube.com/watch?v=a5iPQz3GBYw

Grin
 

...
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Reply #8 - May 16th, 2012 at 1:06am

expat   Offline
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Deep behind enemy lines!

Gender: male
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skoker wrote on May 15th, 2012 at 11:01pm:
expat wrote on May 15th, 2012 at 10:43pm:
Look at the weather in said videos. It is for the most part sunny and hot. Find a video of a take off on a day when it is cold and wet, you are most likely not to hear this sound.

Um...

http://www.youtube.com/watch?v=knIDhewHxOo

http://www.youtube.com/watch?v=DmCJpQ-rQYc

http://www.youtube.com/watch?v=a5iPQz3GBYw

Grin



I did not say it would not happen. If it does happen it is due to the power setting, that being up near to max power. Due to aircraft weight a reduced power take off will not be used. The reason you do not hear it at the rear of the aircraft is because it is high power intake resonance. It occurs at around 96%. A reduced power take off can go as low as 89%, but is normally around 93-ish%, at that setting you will not (normally) hear it, though humidity can also play a factor.
The correct name for this is "fan loading noise"
The fan of a high-bypass turbofan engine has a relatively high loading. Each blade in the fan is operating at a high lift coefficient. Under these conditions, pressure on the front surface of the fan blade is much lower than the pressure on the rear of the blade. This difference in pressure comes together at the trailing edge of the blade. The difference results in a pressure disturbance. This pressure disturbance is the source of the fan noise and as such is linked to the power setting the crew have selected for a take off run. When I do a "trim run" (max power run up) it can also be heard, but again not always as temperature and humidity also play a factor as does the lack of ram effect.

Matt
 
PETA ... People Eating Tasty Animals.

B1 Boeing 737-800 and Dash8 Q-400
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Reply #9 - May 16th, 2012 at 4:13pm

ilikerio   Offline
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R/C flying, plastic/paper
models, FSX, and IL-2
Coral Springs, Florida

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Shocked
Ok... So I should be able to hear it because we're sitting kind of in front of the engine (AAL B763 with GE CF6s). CF6s have a very slight buzzsaw so I've heard...  Roll Eyes
 
This... Is Rio.
...
Loud and talkative Bengal cat. He's not ours; his owner lives two houses down, but he wanders around the neighborhood getting food and talking to his human friends. He'll sometimes get into a fight if he meets another cat though... But it's rare because he's kicked out all other cats in the neighborhood. He thinks all the houses are his too...
I came up with the name "ilikerio" way back in 4th grade, and I've used it with most user accounts ever since.
My group of close friends and I have named ourselves The Rio Group. ilikerio Productions is the media branch, located here: http://www.youtube.com/user/ilikerio
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Reply #10 - May 17th, 2012 at 3:12am

expat   Offline
Colonel
Deep behind enemy lines!

Gender: male
 Posts: 8499
 *****
 
ilikerio wrote on May 16th, 2012 at 4:13pm:
Shocked
Ok... So I should be able to hear it because we're sitting kind of in front of the engine (AAL B763 with GE CF6s). CF6s have a very slight buzzsaw so I've heard...  Roll Eyes


As I keep saying, it will depend if the crew perform a reduced power take off or if the aircraft is loaded to the gunnels in which case he will firewall the throttles. Add to that humidity and temperature.

Matt
 
PETA ... People Eating Tasty Animals.

B1 Boeing 737-800 and Dash8 Q-400
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Reply #11 - May 18th, 2012 at 4:37pm

ilikerio   Offline
Colonel
R/C flying, plastic/paper
models, FSX, and IL-2
Coral Springs, Florida

Gender: male
 Posts: 140
 *****
 
Well, just in the case he uses full throttle...   Roll Eyes
 
This... Is Rio.
...
Loud and talkative Bengal cat. He's not ours; his owner lives two houses down, but he wanders around the neighborhood getting food and talking to his human friends. He'll sometimes get into a fight if he meets another cat though... But it's rare because he's kicked out all other cats in the neighborhood. He thinks all the houses are his too...
I came up with the name "ilikerio" way back in 4th grade, and I've used it with most user accounts ever since.
My group of close friends and I have named ourselves The Rio Group. ilikerio Productions is the media branch, located here: http://www.youtube.com/user/ilikerio
Back to top 
IP Logged
 
Reply #12 - May 18th, 2012 at 5:25pm

jetprop   Offline
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A freeware addict!
a chair infront of a monitor.

Posts: 1523
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ilikerio wrote on May 18th, 2012 at 4:37pm:
Well, just in the case he uses full throttle...   Roll Eyes

You mean:if the pilot is jetprop... Grin
I ALWAYS go full throttle in FSX,nearly every plane if not all! Grin
 
...
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Reply #13 - May 18th, 2012 at 5:29pm

ilikerio   Offline
Colonel
R/C flying, plastic/paper
models, FSX, and IL-2
Coral Springs, Florida

Gender: male
 Posts: 140
 *****
 
Well come on... It's not real...  Roll Eyes
You don't care about sound restrictions and reduced power takeoffs and crap like that in a virtual game...  Tongue
 
This... Is Rio.
...
Loud and talkative Bengal cat. He's not ours; his owner lives two houses down, but he wanders around the neighborhood getting food and talking to his human friends. He'll sometimes get into a fight if he meets another cat though... But it's rare because he's kicked out all other cats in the neighborhood. He thinks all the houses are his too...
I came up with the name "ilikerio" way back in 4th grade, and I've used it with most user accounts ever since.
My group of close friends and I have named ourselves The Rio Group. ilikerio Productions is the media branch, located here: http://www.youtube.com/user/ilikerio
Back to top 
IP Logged
 
Reply #14 - May 18th, 2012 at 6:06pm

jetprop   Offline
Colonel
A freeware addict!
a chair infront of a monitor.

Posts: 1523
 *****
 
ilikerio wrote on May 18th, 2012 at 5:29pm:
Well come on... It's not real...  Roll Eyes
You don't care about sound restrictions and reduced power takeoffs and crap like that in a virtual game...  Tongue

Sound restrictions...
Does that matter in a vulcan? Grin
 
...
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