Contrails

[Darkwing]

Is there a certain speed an aircraft must be going for contrails to form? I
have never seen a 172 with contrails but as a kid I used to go to Road
America with my dad and watch the (then CART Indycars) and in the morning
you could see the contrails off the rear wings, so that tells me it has
something to do with speed/humidity nothing to do with altitude.

BTW, if you never seen an Indycar run at Road America in WI in person I
highly recommend it!

--------------------------------------
DW

[[email protected]]

Darkwing <theducksmail"AT"yahoo.com> wrote:
> Is there a certain speed an aircraft must be going for contrails to form? I
> have never seen a 172 with contrails but as a kid I used to go to Road
> America with my dad and watch the (then CART Indycars) and in the morning
> you could see the contrails off the rear wings, so that tells me it has
> something to do with speed/humidity nothing to do with altitude.

> BTW, if you never seen an Indycar run at Road America in WI in person I
> highly recommend it!

> --------------------------------------
> DW

Highly simplified explanation:

Technically, contrails are formed at altitude from exhaust water
vapor and what you see at low altitudes are vortices usually from
wing tips.

As things like wings move through the air they cause a pressure
drop around them which in turn decreases the air temperature.

If the temperature drop is enough to get below the dew point, the
water vapor condenses any you get visible "fog" for lack of a better
term.

For a more detailed explanation:

http://en.wikipedia.org/wiki/Contrail

--
Jim Pennino

Remove .spam.sux to reply.

[john smith]

In article >,
wrote:

> Highly simplified explanation:
>
> Technically, contrails are formed at altitude from exhaust water
> vapor and what you see at low altitudes are vortices usually from
> wing tips.
>
> As things like wings move through the air they cause a pressure
> drop around them which in turn decreases the air temperature.
>
> If the temperature drop is enough to get below the dew point, the
> water vapor condenses any you get visible "fog" for lack of a better
> term.

You can also watch them form off the prop tip under humid conditions.
Several posters have put up some photos of C130's, Corsairs, etc over on
the binaries group. I have been in a C170 in central Florida and watched
it happen.

[Mxsmanic]

"Darkwing" <theducksmail"AT"yahoo.com> writes:

> Is there a certain speed an aircraft must be going for contrails to form?

No. They depend mostly on atmospheric conditions.

> I have never seen a 172 with contrails but as a kid I used to go to Road
> America with my dad and watch the (then CART Indycars) and in the morning
> you could see the contrails off the rear wings, so that tells me it has
> something to do with speed/humidity nothing to do with altitude.

It has to do with all of these. Any combination of conditions that encourages
water to condense out of the air (including water in engine exhaust).

--
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[Bertie the Bunyip[_2_]]

Mxsmanic > wrote in
:

> "Darkwing" <theducksmail"AT"yahoo.com> writes:
>
>> Is there a certain speed an aircraft must be going for contrails to
>> form?
>
> No. They depend mostly on atmospheric conditions.
>
>> I have never seen a 172 with contrails but as a kid I used to go to
>> Road America with my dad and watch the (then CART Indycars) and in
>> the morning you could see the contrails off the rear wings, so that
>> tells me it has something to do with speed/humidity nothing to do
>> with altitude.
>
> It has to do with all of these. Any combination of conditions that
> encourages water to condense out of the air (including water in engine
> exhaust).
>

new site for ya!


http://****ingdickhead.com/

[Robert M. Gary]

On Mar 20, 9:54 am, "Darkwing" <theducksmail"AT"yahoo.com> wrote:
> Is there a certain speed an aircraft must be going for contrails to form? I
> have never seen a 172 with contrails but as a kid I used to go to Road
> America with my dad and watch the (then CART Indycars) and in the morning
> you could see the contrails off the rear wings, so that tells me it has
> something to do with speed/humidity nothing to do with altitude.
>
> BTW, if you never seen an Indycar run at Road America in WI in person I
> highly recommend it!
>
> --------------------------------------
> DW

Its a secret chemical called Dihydrogen Monoxide or DHMO that the
military is releasing.

-Robert

[Darkwing]

"Robert M. Gary" > wrote in message
ups.com...
> On Mar 20, 9:54 am, "Darkwing" <theducksmail"AT"yahoo.com> wrote:
>> Is there a certain speed an aircraft must be going for contrails to form?
>> I
>> have never seen a 172 with contrails but as a kid I used to go to Road
>> America with my dad and watch the (then CART Indycars) and in the morning
>> you could see the contrails off the rear wings, so that tells me it has
>> something to do with speed/humidity nothing to do with altitude.
>>
>> BTW, if you never seen an Indycar run at Road America in WI in person I
>> highly recommend it!
>>
>> --------------------------------------
>> DW
>
> Its a secret chemical called Dihydrogen Monoxide or DHMO that the
> military is releasing.
>
> -Robert
>

I just drank a big glass full of that stuff today, now I feel bloated and my
bladder is in pain, not sure what to do, better call poison control!

----------------------------------------------
DW

[john smith]

In article >,
"Darkwing" <theducksmail"AT"yahoo.com> wrote:

> > Its a secret chemical called Dihydrogen Monoxide or DHMO that the
> > military is releasing.

> I just drank a big glass full of that stuff today, now I feel bloated and my
> bladder is in pain, not sure what to do, better call poison control!

Better check into a hospital quick!
I heard a news report a couple months ago about a woman competing in a
radio station contest died after drinking too much of that stuff.

[John T]

"john smith" > wrote in message

>
> You can also watch them form off the prop tip under humid conditions.
> Several posters have put up some photos of C130's, Corsairs, etc over
> on the binaries group. I have been in a C170 in central Florida and
> watched it happen.

I've seen it a few times in my C182, as well.

--
John T
http://sage1solutions.com/blogs/TknoFlyer
Reduce spam. Use Sender Policy Framework: http://openspf.org
____________________

[EridanMan]

I just sprayed beer all over my desk.

You win the thread:-P

[Mxsmanic]

john smith writes:

> Better check into a hospital quick!
> I heard a news report a couple months ago about a woman competing in a
> radio station contest died after drinking too much of that stuff.

It takes a couple of litres minimum over a short period to produce the
hyponatremia from which she died.

--
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[Darkwing]

"Mxsmanic" > wrote in message
...
> john smith writes:
>
>> Better check into a hospital quick!
>> I heard a news report a couple months ago about a woman competing in a
>> radio station contest died after drinking too much of that stuff.
>
> It takes a couple of litres minimum over a short period to produce the
> hyponatremia from which she died.
>
> --
> Transpose mxsmanic and gmail to reach me by e-mail.


You don't understand jest and sarcasm do you?

---------------------------------------------
DW

[Robert M. Gary]

On Mar 21, 4:45 pm, john smith > wrote:
> In article >,
>
> "Darkwing" <theducksmail"AT"yahoo.com> wrote:
> > > Its a secret chemical called Dihydrogen Monoxide or DHMO that the
> > > military is releasing.
> > I just drank a big glass full of that stuff today, now I feel bloated and my
> > bladder is in pain, not sure what to do, better call poison control!
>
> Better check into a hospital quick!
> I heard a news report a couple months ago about a woman competing in a
> radio station contest died after drinking too much of that stuff.

That was here in Sacramento. Only a couple years before a student
nearby at UC Davis died in the same way during a hazing ritual. I
think the dangers are now pretty well known by most, not sure what
idiocy was happening at the radio station. The AM guys on that station
107.9 are no longer on the air.
-Robert

[Bertie the Bunyip[_2_]]

Mxsmanic > wrote in
:

> john smith writes:
>
>> Better check into a hospital quick!
>> I heard a news report a couple months ago about a woman competing in a
>> radio station contest died after drinking too much of that stuff.
>
> It takes a couple of litres minimum over a short period to produce the
> hyponatremia from which she died.

jesus wept


bertie

[Mxsmanic]

Robert M. Gary writes:

> I think the dangers are now pretty well known by most, not sure what
> idiocy was happening at the radio station. The AM guys on that station
> 107.9 are no longer on the air.

They knew of the dangers and joked about them. They must be extraordinarily
stupid. Just firing them does not seem sufficient, as their actions were
deliberately negligent and harmful.

--
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[Gig 601XL Builder]

Mxsmanic wrote:
> Robert M. Gary writes:
>
>> I think the dangers are now pretty well known by most, not sure what
>> idiocy was happening at the radio station. The AM guys on that
>> station 107.9 are no longer on the air.
>
> They knew of the dangers and joked about them. They must be
> extraordinarily stupid. Just firing them does not seem sufficient,
> as their actions were deliberately negligent and harmful.

And they warned the participants of the dangers as well. So the participants
are at least equally to blame including the one that died.

[Darkwing]

"Robert M. Gary" > wrote in message
oups.com...
> On Mar 21, 4:45 pm, john smith > wrote:
>> In article >,
>>
>> "Darkwing" <theducksmail"AT"yahoo.com> wrote:
>> > > Its a secret chemical called Dihydrogen Monoxide or DHMO that the
>> > > military is releasing.
>> > I just drank a big glass full of that stuff today, now I feel bloated
>> > and my
>> > bladder is in pain, not sure what to do, better call poison control!
>>
>> Better check into a hospital quick!
>> I heard a news report a couple months ago about a woman competing in a
>> radio station contest died after drinking too much of that stuff.
>
> That was here in Sacramento. Only a couple years before a student
> nearby at UC Davis died in the same way during a hazing ritual. I
> think the dangers are now pretty well known by most, not sure what
> idiocy was happening at the radio station. The AM guys on that station
> 107.9 are no longer on the air.
> -Robert
>

Hold a wee for Wii! Maybe for a PS3 but a Wii, get real!

------------------------------------------
DW

[Mxsmanic]

Gig 601XL Builder writes:

> And they warned the participants of the dangers as well. So the participants
> are at least equally to blame including the one that died.

So if an airplane crew warns passengers about what to do in the event of an
emergency, and the pilots later make a stupid mistake and crash, the crash is
partially the passengers' fault?

--
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[Bertie the Bunyip[_2_]]

Mxsmanic > wrote in
:

> Gig 601XL Builder writes:
>
>> And they warned the participants of the dangers as well. So the
>> participants are at least equally to blame including the one that
>> died.
>
> So if an airplane crew warns passengers about what to do in the event
> of an emergency, and the pilots later make a stupid mistake and crash,
> the crash is partially the passengers' fault?

idiotooooo



Bertie

[Gig 601XL Builder]

Mxsmanic wrote:
> Gig 601XL Builder writes:
>
>> And they warned the participants of the dangers as well. So the
>> participants are at least equally to blame including the one that
>> died.
>
> So if an airplane crew warns passengers about what to do in the event
> of an emergency, and the pilots later make a stupid mistake and
> crash, the crash is partially the passengers' fault?

No but if the pilot warns the passenger that opening the door in-flight
might cause the passenger to fall to the ground and later the passenger
opens the door and falls out I'd say the passenger has some responsibility.

[Mxsmanic]

Gig 601XL Builder writes:

> No but if the pilot warns the passenger that opening the door in-flight
> might cause the passenger to fall to the ground and later the passenger
> opens the door and falls out I'd say the passenger has some responsibility.

Did these radio announcers actually tell contestants that they risked death if
they drank too much water?

Do pilots encourage passengers to open doors in flight after telling them how
dangerous it would be?

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[A Guy Called Tyketto]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Mxsmanic > wrote:
> Gig 601XL Builder writes:
>
>> No but if the pilot warns the passenger that opening the door in-flight
>> might cause the passenger to fall to the ground and later the passenger
>> opens the door and falls out I'd say the passenger has some responsibility.
>
> Did these radio announcers actually tell contestants that they risked death if
> they drank too much water?

They had certified nurses and doctors call in and state that
they risked death. The announcer's response: "It's okay. They had to
sign disclaimers."

Incidentally, 8 hours later, one of the contestants died of
water intoxication.

BL.
- --
Brad Littlejohn | Email:
Unix Systems Administrator, |
Web + NewsMaster, BOFH.. Smeghead! :) | http://www.wizard.com/~tyketto
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