"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.

So, you've got your little story and I've got mine--so what? I'm the
one with the real numbers on his side.

(b) You cannot explain why "drain the sumps" is a daily check list
event for both fuel trucks AND airplanes.

Indeed I can: it is done to test for and drain *any* contaminants from
the tanks. Was that supposed to be hard?

(c) You cannot explain why CessBeePipMoo all have drains at the low
point of the fueling system. It would be a hell of a lot cheaper not
to have to put them in there. Somebody somewhere thought it was a
good idea.

Indeed I can: they are there to enable testing for and draining of *any*
contaminants from the tanks. Was that supposed to be hard?

(d) You cannot explain why a hangared 150 from this airport fifteen
years ago dumped it into a pasture off the end of the runway and then
proceeded to drain two QUARTS (yes, that's quarts) of water from the
tanks.

You cannot explain why your anecdotes conflict with empirical knowledge
of the composition and behavior of the atmosphere. Come back when you
can.

--
Dan
C172RG at BFM