Gas Theft Nashua (ASH)

No, Dan, you do NOT have all the numbers on your side. Agreed, you can
calculate the amount of water in a saturated sample, but you cannot do the
simple calculations unless you factor in how many airchanges you get inside
of vented tanks in any given amount of time. I doubt sincerely that you can
even estimate, no less calculate, this factor.

Although if you can get me a government contract to study the issue, I'll be
happy to consider doing the consulting work {;-)

Jim



"Dan Luke" wrote in message
...

"RST Engineering" wrote:

(a) You can go through the math all day long and still not explain why I
have drained the (hangared) 182 after a particularly humid day or two and
get a tablespoon or two of water in the quick drains.

I see: math is false and your charming story is proof. Very convincing. I
have one too: I've been keeping a 172RG with 62-gal. capacity tanks
outdoors in one of the most humid places in the U. S. for six years. I
never top the tanks unless I specifically need to for the next flight.
Only once in that time have I ever had water in a sample, and that was due
to a bad fuel cap gasket.

RST Engineering wrote:
No, Dan, you do NOT have all the numbers on your side. Agreed, you can
calculate the amount of water in a saturated sample, but you cannot do the
simple calculations unless you factor in how many airchanges you get inside
of vented tanks in any given amount of time. I doubt sincerely that you can
even estimate, no less calculate, this factor.

True, but I'll bet it isn't enough to get two quarts of water into 150
tanks! :-)


Although if you can get me a government contract to study the issue, I'll be
happy to consider doing the consulting work {;-)

Better to stick with the electrons and leave the H2O alone. :-)

Matt

"RST Engineering" wrote:

No, Dan, you do NOT have all the numbers on your side. Agreed, you
can calculate the amount of water in a saturated sample, but you
cannot do the simple calculations unless you factor in how many
airchanges you get inside of vented tanks in any given amount of time.
I doubt sincerely that you can even estimate, no less calculate, this
factor.

Actually, the tank respiration is fairly simple to calculate by knowing
the high temp.and the low temp and calculating the quantity that would
need to be added to maintain atmospheric pressure in the tank at the
lower temperature. You will find, I believe, that even in extreme
temperatures the air change would be fractional, even after many days.
Remember also that when the air is most humid, the daily high/low temp.
delta is smallest, thus limiting tank respiration when condensation
conditions are optimum.

Can you to supply any empirical evidence for your claims?

Although if you can get me a government contract to study the issue,
I'll be happy to consider doing the consulting work {;-)

Another poster has mentioned an actual experiment by Cessna that failed
to produce any detectable water due to condensation in the tanks. If
anyone has a link to a description of this experiment, please post it.

--
Dan
C172RG at BFM