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Rhinozherous

The reason of the roar?

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I think as aviation lovers we all know and enjoy the intense roar sound of an climbing jet engine. Today I watched this vid:

 

https://youtu.be/bdj2lQ6-P_8

 

and I asked myself the first time "you know much about these technichal art pieces, but you dont know exactly where the music comes from"

 

My theorie is that it comes from the N1 blades at high rpm...

What do you know about it? Let me know it!

 

Regards


Klaus Schmitzer

2J5O5jV.png

 

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Fortunately (for passengers' ears), the "buzz saw" noise diminishes and eventually disappears as the aircraft climbs into the thinner, less-dense air at higher altitudes.

 

The first time I flew on a 777-200, I was seated in the cabin just a few rows forward of the engine inlets. The "growl" was extremely intense on takeoff and during the initial climb, and I remember thinking "I have to listen to THAT for the next 11 hours?"

 

I believe that the roar was pretty much gone by the time we climbed through 10,000 feet, and once established in cruise the engines were very quiet indeed.

 

On another long flight on an Airbus 330, I was seated in the very last row of seats at the rear of the cabin. That location was not subject to the "buzz saw", but being behind the engines, was quite noisy due to the exhaust stream at high power settings,( though pretty quiet in cruise). It was a transatlantic flight which step climbed twice. I knew when the step climb was starting each time due to the noticeable increase in noise outside the fuselage as the engines were set to climb power.

 

In my experience as a passenger, the biggest variation in cabin noise has been on the MD-80. In the forward cabin, the engine noise is so low you can barely hear it, even on takeoff. The rear-most seats are another story, being immediately adjacent to the fuselage-mounted engines.


Jim Barrett

Licensed Airframe & Powerplant Mechanic, Avionics, Electrical & Air Data Systems Specialist. Qualified on: Falcon 900, CRJ-200, Dornier 328-100, Hawker 850XP and 1000, Lear 35, 45, 55 and 60, Gulfstream IV and 550, Embraer 135, Beech Premiere and 400A, MD-80.

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I like the buzz saw sound. I don't really know why. Guys just like noise I guess. A throwback to childhood would be my guess.

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Actually, I would be terrified if I didn't hear the buzz-saw sounds! :shok:


Fr. Bill    

AOPA Member: 07141481 AARP Member: 3209010556

Interests: Gauge Programming - 3d Modeling for Milviz

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You want noise? then this is the one for you! Turn your speaker system up to max (I take no responsibility for any damage caused to your speakers, system, your house or any other buildings in the vicinity).

https://www.youtube.com/watch?v=XFTyVYLhV0o

 

Here the noise is caused by the jet eflux exceeding the speed of sound by a large margin. In fact the VC10 was noisier than Concorde on take-off!


3VlzBGn.jpg?1

Super VC10 into LOWI with PF3 at a cinema near you

https://www.youtube.com/watch?v=298UDyNmgUA

 

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So where would the "quietest" part of the plane be? Right next to the engines?


Philip LaBianca

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"I think, therefore I am."

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You want noise? then this is the one for you! Turn your speaker system up to max (I take no responsibility for any damage caused to your speakers, system, your house or any other buildings in the vicinity).

https://www.youtube.com/watch?v=XFTyVYLhV0o

 

You forget "health problems" :-D Very beautiful views of the VC10! Thanks

 

 

Here the noise is caused by the jet eflux exceeding the speed of sound by a large margin. In fact the VC10 was noisier than Concorde on take-off!

  

So where would the "quietest" part of the plane be? Right next to the engines?

I think the quietest place is behind the engines, no buzz saw sound there. Just the sound of the exhaust gases.


Klaus Schmitzer

2J5O5jV.png

 

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I think the quietest place is behind the engines, no buzz saw sound there. Just the sound of the exhaust gases.

In the 10 pretty much anywhere in the cabin except the rear toilets was quiet! That's why it was such a success with passengers. From the cockpit the engines are almost inaudible. Because of the engines hot and high capabilities, at "normal" airfields there was a lot of surplus power so the VC10 was the only other transport aircraft that kicked the back of your seat on take-off besides Concorde.


3VlzBGn.jpg?1

Super VC10 into LOWI with PF3 at a cinema near you

https://www.youtube.com/watch?v=298UDyNmgUA

 

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I knew the VC10 was loud, but I never heard one IRL. Need earmuffs for that thing  :lol:


Philip LaBianca

_____________________

 

 

"I think, therefore I am."

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I live near Travis AFB, which is home to C-5s, C-17s and KC-10s.  The older C-5Bs are being phased out in favor of the newly engined C-5Ms.  I am going to miss the old C-5s, nothing else sounded like them with their TF-39s, now they have been re-equipped with CF6s, and now sound like every other CF6 powered jet.

 

A C-5B departure.

 

Cheers

TJ


"The knack of flying is learning how to throw yourself at the ground and miss." - Douglas Adams
war2.jpg
Tejon 'TJ' Stanley

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I live near Travis AFB, which is home to C-5s, C-17s and KC-10s.  The older C-5Bs are being phased out in favor of the newly engined C-5Ms.  I am going to miss the old C-5s, nothing else sounded like them with their TF-39s, now they have been re-equipped with CF6s, and now sound like every other CF6 powered jet.

Nice sound! Every time I see a C-5 or C-17, I have to think about elephants :-) ...big loud flying elephants.


Klaus Schmitzer

2J5O5jV.png

 

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