kd5sak wrote:

Long years ago, 50 yearsor so before I reached Ham status, a thunderstorm
awakened me in the wee hours and proceeded to dance around in the shallow
hill pasture near the house. Stroke after stroke occurred and all so near I
could hear a loud click as the strike occurred and then the diminishing
rumble. I still haven't figured out the initial click sound, it came from
outside so wasn't a house internal electric phenomenon.

I've read that this click is due to the ear's reaction to the strong
electromagnetic pulse. If that's what you heard, it comes from the ear
itself, not from outside.

Roy Lewallen, W7EL

"Roy Lewallen" wrote in message
...
kd5sak wrote:

Long years ago, 50 yearsor so before I reached Ham status, a
thunderstorm
awakened me in the wee hours and proceeded to dance around in the
shallow
hill pasture near the house. Stroke after stroke occurred and all so
near I
could hear a loud click as the strike occurred and then the diminishing
rumble. I still haven't figured out the initial click sound, it came
from
outside so wasn't a house internal electric phenomenon.

I've read that this click is due to the ear's reaction to the strong
electromagnetic pulse. If that's what you heard, it comes from the ear
itself, not from outside.

Roy Lewallen, W7EL

This is the first time I have seen it mentioned the ear reacting to the
electromagnetic pulse. Most of the time it is described as the same way
the old WW2 depth charges sounded in the submarines. YOu get the click and
then the boom. I forgot the term used but it is something like an impulse
or pressure shock wave traveling faster than the speed of sound and then the
actual sound wave.

Ralph Mowery wrote:

This is the first time I have seen it mentioned the ear reacting to the
electromagnetic pulse. Most of the time it is described as the same way
the old WW2 depth charges sounded in the submarines. YOu get the click and
then the boom. I forgot the term used but it is something like an impulse
or pressure shock wave traveling faster than the speed of sound and then the
actual sound wave.

I do believe that any mechanical wave, such as a pressure or shock wave,
travels at the speed of sound, no more and no less. To travel faster, it
would have to be an electromagnetic wave.

Roy Lewallen, W7EL

I do believe that any mechanical wave, such as a pressure or shock
wave,
travels at the speed of sound, no more and no less. To travel faster,
it
would have to be an electromagnetic wave.

Also, the deaf person wouldn't hear the mechanical wave. Well,
unless they had "some" hearing still available. If it was proven that
a totally deaf person could hear it, that would pretty much nail it
down as
electromagnetic. If that came out to be true, then Coffmans theory
about the auditory nerve picking it up would probably be true unless
some other nerve was actually involved.
MK

On 18 Dec 2005 08:41:47 -0800, wrote:

I do believe that any mechanical wave, such as a pressure or shock
wave,
travels at the speed of sound, no more and no less. To travel faster,
it
would have to be an electromagnetic wave.

Also, the deaf person wouldn't hear the mechanical wave. Well,
unless they had "some" hearing still available. If it was proven that
a totally deaf person could hear it, that would pretty much nail it
down as
electromagnetic. If that came out to be true, then Coffmans theory
about the auditory nerve picking it up would probably be true unless
some other nerve was actually involved.
MK

Doesn't the delta P of a fuel-air bomb travel at greater than the
speed of sound?

R

Russ wrote:

Doesn't the delta P of a fuel-air bomb travel at greater than the
speed of sound?

No.

Roy Lewallen, W7EL

The denotation is supersonic, while the flame spread is subsonic.

"Roy Lewallen" wrote in message
...
Russ wrote:

Doesn't the delta P of a fuel-air bomb travel at greater than the
speed of sound?

No.

Roy Lewallen, W7EL

On Sun, 18 Dec 2005 12:39:09 -0800, Roy Lewallen
wrote:

Russ wrote:

Doesn't the delta P of a fuel-air bomb travel at greater than the
speed of sound?

No.

Roy Lewallen, W7EL

The definition of dentonation includes the flame front moving at
supersonic speeds.

http://www.globalsecurity.org/milita...itions/fae.htm

R

Russ wrote:
On 18 Dec 2005 08:41:47 -0800, wrote:


I do believe that any mechanical wave, such as a pressure or shock
wave,
travels at the speed of sound, no more and no less. To travel faster,
it
would have to be an electromagnetic wave.

Also, the deaf person wouldn't hear the mechanical wave. Well,
unless they had "some" hearing still available. If it was proven that
a totally deaf person could hear it, that would pretty much nail it
down as
electromagnetic. If that came out to be true, then Coffmans theory
about the auditory nerve picking it up would probably be true unless
some other nerve was actually involved.
MK


Doesn't the delta P of a fuel-air bomb travel at greater than the
speed of sound?

R

Also, the pressure wave INSIDE a rifle barrel travels faster than the
speed of sound. It produces velocities of the projectiles at Mach 3 to
Mach 4. Hmmm...

The air pressure profile on an aircraft wing shows supersonic, transonic
and subsonic reponses. Hmmm..

It raises a physics question. How does the velocity of sound vary in a
compressible medium as the temperature, volume and pressure change?

I've read that this click is due to the ear's reaction to the strong
electromagnetic pulse. If that's what you heard, it comes from the ear
itself, not from outside................................

According to old Gary Coffman posts, he says it's picked up by the
auditory nerve. Also, deaf people can hear that click.
I've had two strikes to my mast with me sitting 15 ft away from the
base of the mast. I could hear that click, but I also could hear
the arc sound of the strike going to ground outside. Sounded
like a light bulb being thrown to the ground outside my window.
Not that loud really. I'm fairly convinced the quality of the ground
connection effects the loudness of the strike. The strikes that hit
my well grounded mast are fairly quiet, not counting the overhead
sonic boom. The strikes to the trees in the yard are super loud
in comparison. A loud crack, instead of the quieter arc sound.
MK