Why do jets leave a white trail behind them.

"AliR" wrote in message
om...
Hi everyone,

Me and a friend are wondering why jets leave a white trail behind them.
My
guess is that it's moisture being compressed as it passes through the
turbine (because some leave a single trail, while others leave two
separate
trails). My friend thinks it's because of moisture being cooled as it
passes over the wing (Bernoulli effect).

While flying a bonanza I have seen a small white trail extending from the
wingtip for a little while right after I break through the clouds
(descending).

Is either one of us right?

AliR.


The goobermint is really leaving behind chemtrails to kontrol your brain!
BWHHAAAAAAHAAAAA!!!!

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

"george" wrote in message
oups.com...

Gig 601XL Builder wrote:
"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)



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

I kept asking the 'chemtrail' kooks where I had to look on the aircraft
I fly to find the 'chem tank and the spray nozzles'
ROTFL



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 the
atmosphere is to dry to support the moisture! Then on days where moisture is
moving in the "chemtrails" manage to hang around since their is enough
support in the upper atmosphere. Wow that is really difficult to understand.
Chemtrail kooks should be shot.

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

"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

They cruised on just the piston engines and used all 10 for
take-off and attack runs, I think they did the climb using
just the pistons.


"Morgans" wrote in message
...
|
| "Jim Macklin" wrote
in message
| news:LMUzf.66027$QW2.60514@dukeread08...
| Purple 115/145 avgas, burns just fine in the jet and was
| required by the big P&W radials.
|
| Yep. As I recall, the jet engines did also not run
continuously, but were
| turned off, after takeoff and climb. Correct?
| --
| Jim in NC
|

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

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
|

"Jim Macklin" wrote in message
news:kbWzf.66479$QW2.33865@dukeread08...
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.
\\
Yes, I do know all of that, but do smaller jet fueled planes (Malibu and
smaller) have heated tanks? I still say that they try real hard to keep
water away from jet fuel, and the amount of water added to the contrail
because of water in the fuel is a small fraction of the water released from
the combustion process.
--
Jim in NC

"Jim Macklin" wrote in message
news:jbWzf.66478$QW2.21900@dukeread08...
It is hydroscopic and absorbs water. The water in the
"spaces" between the hydrocarbon is where the fungus grows.
\\
Damn spell checker. Hydroscopic prollly was not a choice. G
--
Jim in NC

"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.
\\
Combustion leaves some hydrogen unclaimed, and the oxygen is really happy to
claim it, and when it combines two H's, and one O, you get water.

Weren't awake during that day of chemistry, were you, Matt? g
--
Jim in NC

Matt Whiting wrote in news:n1Vzf.5348$lb.461860
@news1.epix.net:

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

Others have already explained how there is water diluted in the
fuel, but I think you forgot something. What do you burn that
hydrocarbon with? That's right! O2. When the fuel bruns, some of
that H combines with some of that O2 and you end up with some
H2O.

Brian
--
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