Preparing for a XC : Bathroom Breaks

Peter R. wrote:
One tip, though: Don't bother hooking up a funnel and hose to the jug. This
will result in a most undesirable backflow.

This is what Usenet is all about: learning from other people's mistakes.

.... Alan
--
Alan Gerber
PP-ASEL
gerber AT panix DOT com

"Alan Gerber" wrote

This is what Usenet is all about: learning from other people's mistakes.

How true.

If you were to use a small vent tube in addition to the flow tube, that
would eliminate the backup problem. It is just another point of leakage, so
to speak.
--
Jim in NC

On Thu, 25 Jan 2007 22:40:23 -0500, in ,
Morgans wrote:
If you were to use a small vent tube in addition to the flow tube, that
would eliminate the backup problem. It is just another point of
leakage, so to speak.

Of course, some of have aircraft with canopies, so theoretically, all we
need to do is slow to an acceptable speed, slide back the canopy, and pee
off the side... grin

Come to think of it, drilling a hole in the floor and running a tube
through there for a relief tube is starting to sound a lot better...

Grumman-581,

Come to think of it, drilling a hole in the floor and running a tube
through there for a relief tube is starting to sound a lot better...


You mean, regularly spraying a highly corrosive fluid onto the
underside of your plane, which then creeps in through every opening and
seam, sounds good? I don't get it...

--
Thomas Borchert (EDDH)

Thomas Borchert writes:

You mean, regularly spraying a highly corrosive fluid onto the
underside of your plane, which then creeps in through every opening and
seam, sounds good? I don't get it...

Urine is not highly corrosive. It's mostly sterile, dilute salt water
with a bit of urea, and a neutral pH.

--
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Sigh.

It is not its pH that makes urine corrosive, but the dissolved salts
that become reactive. That's why cars that are close to the oceans rust
more quickly than do those in rainy inland locations.

Sooner or later you may get something right. Let me rephrase that.
Sooner or later you may apply a known fact correctly to the situation
being discussed. That urine is more or less neutral, or even more
importantly has little buffering capacity, is true, but that fact is
not relevant to the topic.




On Jan 26, 8:14 am, Mxsmanic wrote:
Thomas Borchert writes:
You mean, regularly spraying a highly corrosive fluid onto the
underside of your plane, which then creeps in through every opening and
seam, sounds good? I don't get it...Urine is not highly corrosive. It's mostly sterile, dilute salt water
with a bit of urea, and a neutral pH.

--
Transpose mxsmanic and gmail to reach me by e-mail.

Tony writes:

It is not its pH that makes urine corrosive, but the dissolved salts
that become reactive. That's why cars that are close to the oceans rust
more quickly than do those in rainy inland locations.

Urine isn't usually terribly concentrated. Some of the byproducts of
urine that are produced after exogenous microorganisms attack it (such
as ammonia) are much more damaging.

--
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On Jan 26, 12:49 pm, "Tony" wrote:
Sigh.

It is not its pH that makes urine corrosive, but the dissolved salts
that become reactive. That's why cars that are close to the oceans rust
more quickly than do those in rainy inland locations.


Tony,
Here is another example of the corrosive effect of urine
http://tinyurl.com/26ghv8

"On the pitting corrosion of high strength aluminium alloys by rat
urine
Sreekumar, K; Jacob, E; Natarajan, A; Lakshmanan, T S
Praktische Metallographie (Germany). Vol. 34, no. 9, pp. 478-481. Sept.
1997

High strength AFNOR 7020 aluminium alloy sheets in T6 condition are
used for fabricating propellant tanks (nitrogen tetroxide N sub 2 O sub
4 and unsymmetrical dimethyl hydrazine UDMH) for launch vehicle
applications. These tanks are fabricated through welding route and are
filled with dry nitrogen gas at 300 mbar and sealed at both ends. The
tank is then cocooned with aluminised plastic sheets and stored under
positive dry nitrogen gas pressure. During the storage rats had cut
open the aluminised plastic sheets and had urinated all over the
surfaces of the aluminium alloy tank. The tank surface showed
discolouration and severe pitting corrosion attack wherever the rat
urine had come in contact with it. This paper highlights the
investigations made to understand the severity of the corrosion attack
on the surface of the tank with a view to clear it for further
processing and utilisation.

I'd bet someone will argue that rat urine is not the same as
human stuff. The counter argument is that some people are considered
'dirty rats' ;-)

By the way, the pH level of human urine can range from 4.5 to 8
and normal urine is slightly acidic.

"Mxsmanic" wrote in message
...
Thomas Borchert writes:

You mean, regularly spraying a highly corrosive fluid onto the
underside of your plane, which then creeps in through every opening and
seam, sounds good? I don't get it...

Urine is not highly corrosive. It's mostly sterile, dilute salt water
with a bit of urea, and a neutral pH.


Quit demonstrating your stupidity or cite your sources, such as:
Read the last line twice...

http://www.nlm.nih.gov/medlineplus/e...cle/003583.htm
....pH is a measure of how acidic or alkaline a fluid is, like blood or
urine. The pH in blood is maintained within the narrow range of 7.35 to
7.45. Your body maintains this narrow range by using buffers -- chemicals
that can switch back and forth between 2 forms, a weak acid or weak base.
The buffers are only temporary "stop gaps" to avoid dramatic changes in
blood pH.
Long-term correction of blood pH requires the kidneys to excrete the acid or
base in urine. For example, when your blood pH is low (acidic), your kidneys
react by excreting more acid in the urine. The urine pH becomes more acidic
until the blood pH returns to normal.

In some cases, checking your urine pH is helpful for identifying body
acid-base imbalances. In other cases, a blood pH test is needed.

Your provider may want to modify your urine pH to help prevent kidney
stones. Acidic urine is associated with xanthine, cystine, uric acid, and
calcium oxalate stones. Alkaline urine is associated with calcium carbonate,
calcium phosphate, and magnesium phosphate stones.

Some medications are more effective in acidic or alkaline environments. For
example, streptomycin, neomycin, and kanamycin are more effective in
treating urinary tract infections when the urine is alkaline.

Normal Values Return to top

The normal values range from 4.6 to 8.0.

Casey Wilson writes:

Long-term correction of blood pH requires the kidneys to excrete the acid or
base in urine.

The acid or base. QED.

The normal pH is very close to 7 (neutral).

Your provider may want to modify your urine pH to help prevent kidney
stones. Acidic urine is associated with xanthine, cystine, uric acid, and
calcium oxalate stones. Alkaline urine is associated with calcium carbonate,
calcium phosphate, and magnesium phosphate stones.

Acid, alkaline. See?

The normal values range from 4.6 to 8.0.

And the average is just about 7.0.

--
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