Why do jets leave a white trail behind them.

Darkwing wrote:

Here is the deal on "chemtrails". Ever notice on a nice day with no low,
medium or high clouds that jets also leave no vapor trails? Why?

Because it's too hard to hide them on clear days!


-m
--
## Mark T. Dame
## VP, Product Development
## MFM Software, Inc. (http://www.mfm.com/)
"Artificial intelligence researchers were, at times, paradoxically
regarded as both the elite and the "lunatic fringe" of computer
science."
-- Artificial Intelligence Using C, Herbert Schildt

Gig 601XL Builder wrDOTgiaconaATcox.net wrote:
How dare you promote the cover story that contrails are just water vapor and
exhaust. It is an operation by the CIA, FBI, NSA and Disney to poison us
all. You must be one of them.

OK I made up the Disney part, but you can read the TRUTH at the link below.

http://www.carnicom.com/contrails.htm

Personally, I believe it more from Disney than from the Govt. Acronyms.
I was working at JPL in the early 90s when an RFP came in from one of
the US military organizations. They wanted help defining/describing
an immersive training environment. As we were reading the RFP we
all said in unison "they want a holodeck..." (Just remember, JPL was
a 30 min drive from Paramount Studios, and some of the JPL folk were
"consultants" on Trek. And various incarnations of Trek filmed at
JPL facilities). Of course when Disney (or ILM) wants to do anything,
they just need budget approval from the board or else a signed check
from a customer. When JPL wants to do anything, it's a trip to
Congress.

So who do you think is going to build a working holodeck first?

Heard something earlier this week, that Steve Jobs will become the
single largest shareholder of Disney.

In a similar vein...I remember a great comment in a book from a number
of years ago mentioning the "Military-Industrial-Entertainment Complex".
Seems like it's getting closer and closer.

"Blanche" wrote in message
...
Gig 601XL Builder wrDOTgiaconaATcox.net wrote:
How dare you promote the cover story that contrails are just water vapor
and
exhaust. It is an operation by the CIA, FBI, NSA and Disney to poison us
all. You must be one of them.

OK I made up the Disney part, but you can read the TRUTH at the link
below.

http://www.carnicom.com/contrails.htm

Personally, I believe it more from Disney than from the Govt. Acronyms.
I was working at JPL in the early 90s when an RFP came in from one of
the US military organizations. They wanted help defining/describing
an immersive training environment. As we were reading the RFP we
all said in unison "they want a holodeck..." (Just remember, JPL was
a 30 min drive from Paramount Studios, and some of the JPL folk were
"consultants" on Trek. And various incarnations of Trek filmed at
JPL facilities). Of course when Disney (or ILM) wants to do anything,
they just need budget approval from the board or else a signed check
from a customer. When JPL wants to do anything, it's a trip to
Congress.

So who do you think is going to build a working holodeck first?

Heard something earlier this week, that Steve Jobs will become the
single largest shareholder of Disney.

In a similar vein...I remember a great comment in a book from a number
of years ago mentioning the "Military-Industrial-Entertainment Complex".
Seems like it's getting closer and closer.


You just won the Super Bowl, where you going next?

I'm going to Boot Camp!

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

Thomas Borchert wrote:

AliR,


Is either one of us right?



Your friend, partly. There are atmospheric conditions when the pressure
change over the wing or at a wing tip is enough to make the water in
the air visible. But they are rare and don't make long contrails. The
long contrails from jets you see are because the exhaust contains small
particles (soot and other stuff) which cause the water vapor in the air
to condense on them where it wouldn't condense without them.


And the combustion of hydrocarbons produces a lot of water...

Matt

Jet fuel also contains a lot (relatively) of water, which
condenses soon after leaving the exhaust. That is why they
are called CONTRAILS condensation trails. They were first
seen behind the bombers during WWII and so-named.


"Thomas Borchert" wrote in
message ...
| AliR,
|
| Is either one of us right?
|
|
| Your friend, partly. There are atmospheric conditions when
the pressure
| change over the wing or at a wing tip is enough to make
the water in
| the air visible. But they are rare and don't make long
contrails. The
| long contrails from jets you see are because the exhaust
contains small
| particles (soot and other stuff) which cause the water
vapor in the air
| to condense on them where it wouldn't condense without
them.
|
| --
| Thomas Borchert (EDDH)
|

Jim Macklin wrote:

Jet fuel also contains a lot (relatively) of water, which
condenses soon after leaving the exhaust. That is why they
are called CONTRAILS condensation trails. They were first
seen behind the bombers during WWII and so-named.

If jet fuel is full of water, how do you get it to burn? When I took
chemistry, hydrocarbon fuels contained .... drum roll please ... carbon
and hydrogen. No water of any level of significance.

Matt

"Matt Whiting" wrote

If jet fuel is full of water, how do you get it to burn? When I took
chemistry, hydrocarbon fuels contained .... drum roll please ... carbon
and hydrogen. No water of any level of significance.

Jet fuel, kerosene, diesel fuel, are all hygroscopic. That means that they
have an affinity for absorbing water. Great amounts of it. If they absorb
enough, then it will not burn.

This is one reason why you don't have to sump jet fueled airplane's tanks.
There will be no separate water to drain.

I do take some deference to Jim's saying that jet fuel contains significant
amounts of water. They try real hard to keep jet fuel dry, because it they
didn't, it would start to freeze out, while in the fuel, at altitude.
--
Jim in NC

Most jet aircraft have heated fuel tanks and or use PRIST.
The fuel control units are heated by engine oil or electric
elements so the screens stay ice free.


"Morgans" wrote in message
...
|
| "Matt Whiting" wrote
|
| If jet fuel is full of water, how do you get it to burn?
When I took
| chemistry, hydrocarbon fuels contained .... drum roll
please ... carbon
| and hydrogen. No water of any level of significance.
|
| Jet fuel, kerosene, diesel fuel, are all hygroscopic.
That means that they
| have an affinity for absorbing water. Great amounts of
it. If they absorb
| enough, then it will not burn.
|
| This is one reason why you don't have to sump jet fueled
airplane's tanks.
| There will be no separate water to drain.
|
| I do take some deference to Jim's saying that jet fuel
contains significant
| amounts of water. They try real hard to keep jet fuel
dry, because it they
| didn't, it would start to freeze out, while in the fuel,
at altitude.
| --
| Jim in NC
|

On Thu, 19 Jan 2006 18:31:45 -0500, "Morgans"
wrote:

Jet fuel, kerosene, diesel fuel, are all hygroscopic. That means that they
have an affinity for absorbing water. Great amounts of it. If they absorb
enough, then it will not burn.

I suppose that's how algae(?) gets to grow in fuel tanks? A friend has
a boat with one diesel tank that's full of gunk; he can't get it out.
And I recall that years ago Pease Air Force Base nearby was bedeviled
by stuff growing in some of its jet-fuel tanks.


-- all the best, Dan Ford

email: usenet AT danford DOT net

Warbird's Forum: www.warbirdforum.com
Piper Cub Forum: www.pipercubforum.com
In Search of Lost Time: www.readingproust.com

It is hydroscopic and absorbs water. The water in the
"spaces" between the hydrocarbon is where the fungus grows.


"Matt Whiting" wrote in message
...
| Jim Macklin wrote:
|
| Jet fuel also contains a lot (relatively) of water,
which
| condenses soon after leaving the exhaust. That is why
they
| are called CONTRAILS condensation trails. They were
first
| seen behind the bombers during WWII and so-named.
|
| If jet fuel is full of water, how do you get it to burn?
When I took
| chemistry, hydrocarbon fuels contained .... drum roll
please ... carbon
| and hydrogen. No water of any level of significance.
|
| Matt