Sign in to follow this  
Rhinozherous

The reason of the roar?

Recommended Posts

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

Share this post


Link to post
Share on other sites
Help AVSIM continue to serve you!
Please donate today!

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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!

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

  

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.

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this