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Engine Sound Onboard A Supersonic Flight  
User currently offlineKwcarolma From Australia, joined Jun 2006, 42 posts, RR: 0
Posted (8 years 1 month 1 week 4 days 2 hours ago) and read 6256 times:

I was browsing some aviation related forum and found an interesting question, that whether we're able to hear any sound generated by the aircraft we're onboard when it's flying supersonic. So far I ain't lucky enough to ride a supersonic flight so I don't know the answer. But my guest is we're able to hear that as we're in motion with the aircraft itself so we can catch any sound generated by the aircraft because we're moving in the same speed as it's.

6 replies: All unread, jump to last
 
User currently offlineCessna057 From United States of America, joined Sep 2006, 439 posts, RR: 1
Reply 1, posted (8 years 1 month 1 week 4 days 1 hour ago) and read 6230 times:

I have never been on a supersonic, but i would think the answer would be this: When you are accelerating to M1.0+, yes you could hear it, but after that, the sound would be behind you and it would be rather quiet. I've heard that the concord was very noisy because of the air passing around the body, not necessarily the engines.

Again, I have never been on a supersonic flight, please correct me if i am wrong



Hold it . . . Hold it . . . HOLD THE FREAKIN NOSE UP!!
User currently offlinePtcflyer From United States of America, joined Apr 2001, 103 posts, RR: 0
Reply 2, posted (8 years 1 month 1 week 4 days 1 hour ago) and read 6229 times:

Flying on Concorde... the sound is like a normal subsonic flight... perhaps the engines are a bit louder.

You are correct, you do not hear any super-sonic booms or any other unusual sounds as you pass through the speed of sound.

The only way of knowing how fast you are going is by:

1) Looking at the Mach Meter at the front of the cabin.
2) Noticing your approach into Paris after only 3 1/2 hours after leaving JFK.

I recall a slight "puff" of acceleration as we passed through Mach 1...but the sound was not very noticeable.

The most noticeable effect of flying supersonic is that the skin of the plane continued to "heat up". Standing near the door... or leaning toward the window, I could feel the heat.

Otherwise, The Concorde had the feeling of a regional jet with domestic first class seats. But the coolest part of the flight is when we were invited to the cockpit! Even post 9/11!


User currently offlineVikkyvik From United States of America, joined Jul 2003, 10338 posts, RR: 26
Reply 3, posted (8 years 1 month 1 week 4 days 1 hour ago) and read 6225 times:

Quoting Kwcarolma (Thread starter):
But my guest is we're able to hear that as we're in motion with the aircraft itself so we can catch any sound generated by the aircraft because we're moving in the same speed as it's.

Any sound that is transmitted through the aircraft frame will be heard. The air inside the cabin is not moving with respect to you, so any sounds that reach the cabin air will reach you.

I'd imagine there's quite a bit of noise transmitted through the aircraft, from both the engines and the air friction.

At least, that's the way it seems to me. Correct me if I'm wrong.

"I recall a slight "puff" of acceleration as we passed through Mach 1...but the sound was not very noticeable."

Believe that the bumps you feel are the afterburners (reheats) being lit. If I remember correctly, they're lit at around M0.8, and turned off around M1.6.

[Edited 2006-11-12 07:30:41]


How can I be an admiral without my cap??!
User currently offlineHAL From United States of America, joined Jan 2002, 2572 posts, RR: 53
Reply 4, posted (8 years 1 month 1 week 4 days 1 hour ago) and read 6164 times:

Quoting Vikkyvik (Reply 3):
Any sound that is transmitted through the aircraft frame will be heard. The air inside the cabin is not moving with respect to you, so any sounds that reach the cabin air will reach you.

Vikkyvik is correct. Even in a subsonic jetliner, almost all the engine noise you hear is what is conducted through the airframe, and not across the air into the fuselage. Most of the air moving through the engine is doing so a nearly the speed of sound when the engine is producing high (takeoff, climb, & cruise) power settings, so the sound from inside the engine is hard to hear. The roar from the exhaust can be heard in the aft portions of a subsonic aircraft with wing mounted engines, as is noticeable when you walk from one end of the plane to the other.

With supersonic aircraft of course, you can't hear the noise through the air, but the airframe does conduct that noise, and with higher airspeeds comes more air noise around the fuselage. The concorde was actually a fairly noisy aircraft because of that.

HAL



One smooth landing is skill. Two in a row is luck. Three in a row and someone is lying.
User currently offlineTristarSteve From Sweden, joined Nov 2005, 4069 posts, RR: 33
Reply 5, posted (8 years 1 month 1 week 3 days 13 hours ago) and read 5930 times:

Because the Concorde fuselage heats up in flight it needs more cabin air conditioning to keep it cool.
On my one and only Concorde flight I thought it was quite noisy inside, but it was explained to me later by a Concorde engineer that it was the air conditioning noise.
Also remember the Concorde was always an old aircraft. Technology in cabin noise has come a long way since the early sixties.


User currently offlineRTFM From United Kingdom, joined Oct 2004, 442 posts, RR: 0
Reply 6, posted (8 years 1 month 1 week 3 days 13 hours ago) and read 5879 times:

Believe me - you could hear the engines when you accelerated on take off!

Much louder than a subsonic jet. But in the cruise I can't remember it being any noisier than a subsonic.... And as previously stated, apart from the mach reading in the cabin, there is no other sensation of going supersonic; didn't even cause a ripple in the champagne!

 cloudnine 


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