Re: but does the pilot hear the sonic boom?

["Kilmer, Skip" <kilmers@GREENHILL.ORG>]

So you can hear the sound made by the plane's skin passing through the air, whether the plane is above or below Mach 1. My memory of flying supersonic (admittedly decades ago) is that the quality of sound heard inside the plane doesn't change when passing through the speed of sound. People who've flown in the SST report the same observation.
skip

-----Original Message-----
From: Bernard Cleyet [mailto:anngeorg@PACBELL.NET]
Sent: Monday, December 01, 2003 13:27
To: PHYS-L@lists.nau.edu
Subject: Re: but does the pilot hear the sonic boom?


How so?

Is not the "bow" wave created at the bow * in front of the passenjares?
Therefore,  Not quite:

http://www.madsci.org/posts/archives/feb98/886430559.Ph.r.html

Check out the links, also.

* leading edge of wave.  All of the plane contributes to the acoustical
disturbance.

Can sound created ahead of the 'plane be heard, e.g. another plane's bow
wave?  (Didn't find a ref. for this.)

bc

Kilmer, Skip wrote:

> No. In a well-designed supersonic craft the only way you know you're =
> going faster that (outside) sound is to watch the Mach meter.
> skip
>
> -----Original Message-----
> =46rom: Larry Smith [mailto:larry.smith@SNOW.EDU]
> Sent: Monday, December 01, 2003 10:50
> To: PHYS-L@lists.nau.edu
> Subject: but does the pilot hear the sonic boom?
>
>
> At 3:46 PM -0600 11/24/03, Jorge Salazar wrote:
>
>
> > *********************************************************
> > Wednesday,  November 26, 2003
> > SOUND SPEED
> > Sound waves move at about 340 meters per second -- about two-tenths =
> of a
>
>
> > mile per second.  A listener wonders if you can hear anything when y=
> ou
>
>
> > travel faster than sound. The answer -- after this on Earth and Sky.
> > _________________________________________________________
> >
> > DB:  This is Earth and Sky.  When we visited the National Air and Sp=
> ace
>
>
> > Museum in Washington D.C., we got this question.
> >
> > Caitlin Rush: My name's Caitlin Rush, and I'm from State College,
> > Pennsylvania , and I ask, "When you're traveling at the speed of sou=
> nd or
>
>
> > faster can you hear anything?"
> >
> > JB:  Caitlin, the answer is yes.  Imagine you're seated in a parked =
> car.
>
>
> > You switch on the radio.  The car's speakers begin to vibrate. The s=
> peaker
>
>
> > cone presses against air molecules near the speaker, which push agai=
> nst
>
>
> > neighboring air molecules.  Much like firefighters passing a bucket,=
> this
>
>
> > wave of pressure eventually reaches your ears.  Your brain interpret=
> s this
>
>
> > wave of pressure as sound.
> >
> > DB:  Now imagine you attach a pointy nose to your car and add enough
> > horsepower to break the sound barrier.  As you cruise at more than 3=
> 40
>
>
> > meters per second -- that's more than two-tenths of a mile per secon=
> d -- or
>
>
> > faster than the speed of sound -- you reach over and switch on the r=
> adio.
>
>
> > Your car -- and you -- and all the air molecules around you -- are
> > traveling that fast.  So the sound wave pushes away from the vibrati=
> ng
>
>
> > speakers in exactly the same way it did in the parked car, and you c=
> an hear
>
>
> > the sound.
> >
> > JB:  And that's good news for pilots and passengers of supersonic ai=
> rcraft!
>
>
> > Thanks for your question, Caitlin.  And with thanks to the National =
> Science
>
>
> > Foundation, we're Block and Byrd for Earth and Sky.
> >
> > http://www.earthsky.com/2003/es031126.html
> >
> >
> > *********************************************************