Kwcarolma From Australia, joined Jun 2006, 42 posts, RR: 0 Posted (8 years 7 months 3 weeks 6 days 19 hours ago) and read 6844 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.
Cessna057 From United States of America, joined Sep 2006, 439 posts, RR: 1
Reply 1, posted (8 years 7 months 3 weeks 6 days 19 hours ago) and read 6818 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
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Vikkyvik From United States of America, joined Jul 2003, 11113 posts, RR: 25
Reply 3, posted (8 years 7 months 3 weeks 6 days 19 hours ago) and read 6813 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]
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HAL From United States of America, joined Jan 2002, 2595 posts, RR: 52
Reply 4, posted (8 years 7 months 3 weeks 6 days 18 hours ago) and read 6752 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.
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TristarSteve From Sweden, joined Nov 2005, 4193 posts, RR: 32
Reply 5, posted (8 years 7 months 3 weeks 6 days 6 hours ago) and read 6518 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.
RTFM From United Kingdom, joined Oct 2004, 465 posts, RR: 0
Reply 6, posted (8 years 7 months 3 weeks 6 days 6 hours ago) and read 6467 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!