wrote:


Oh, but they DO. Any variation in temperature of the air surrounding
the tank will cause a pumping action. Temp goes up, the air in the
tank expands and finds a way out to create equilibrium. Temp goes
down, the tank inhales air containing moisture.

So? The moisture just goes right out again with the air. In the case of
the empty tank for the winter Rich was discussing, there is no thermal mass
of fuel to create the temperature differentials that would create
significant condensation. Even in the case of tanks partially full of fuel
condensation on a tank top is unlikely to be a significant issue (see my
reply to Larrry).

--
Roger Long

http://www.yachtsurvey.com/myth_of_c...fuel_tanks.htm

On 2008-11-13 10:56:30 -0500, Gordon said:

http://www.yachtsurvey.com/myth_of_c...fuel_tanks.htm

How did you find that? I went there first of course, but couldn't find it.

"Wasted" a bit of time, as usual, as I found a half-dozen articles of interest.

--
Jere Lull
Xan-à-Deux -- Tanzer 28 #4 out of Tolchester, MD
Xan's pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI trips & tips: http://homepage.mac.com/jerelull/BVI/

On Thu, 13 Nov 2008 12:07:51 -0500, wrote:

No, unfortunately, the moisture is heavier than air and settles in the
tank, where it remains.

Unfortunately, no. Water vapor has a molecular weight of 18, air is
29. Density varies directly with molecular weight.

Casady

On Thu, 13 Nov 2008 14:50:12 -0500, wrote:

On Thu, 13 Nov 2008 19:43:37 GMT, (Richard
Casady) wrote:

On Thu, 13 Nov 2008 12:07:51 -0500, wrote:

No, unfortunately, the moisture is heavier than air and settles in the
tank, where it remains.

Unfortunately, no. Water vapor has a molecular weight of 18, air is
29. Density varies directly with molecular weight.

Casady

So, if you fill a balloon with water, it will fly? Amazing! Does NASA
know about this?

What part of vapor didn't you understand?

Casady

On Thu, 13 Nov 2008 21:10:46 GMT, (Richard
Casady) wrote:

On Thu, 13 Nov 2008 14:50:12 -0500, wrote:

On Thu, 13 Nov 2008 19:43:37 GMT, (Richard
Casady) wrote:

On Thu, 13 Nov 2008 12:07:51 -0500, wrote:

No, unfortunately, the moisture is heavier than air and settles in the
tank, where it remains.

Unfortunately, no. Water vapor has a molecular weight of 18, air is
29. Density varies directly with molecular weight.

Casady

So, if you fill a balloon with water, it will fly? Amazing! Does NASA
know about this?

What part of vapor didn't you understand?

Casady

Okay, so you are claiming that if I fill a balloon with water vapor
and let go of it, it will float upwards? Why didn't they fill the
Hindenburg with Water Vapor?

On Thu, 13 Nov 2008 16:32:55 -0500, wrote:

On Thu, 13 Nov 2008 21:10:46 GMT, (Richard
Casady) wrote:

On Thu, 13 Nov 2008 14:50:12 -0500, wrote:

On Thu, 13 Nov 2008 19:43:37 GMT, (Richard
Casady) wrote:

On Thu, 13 Nov 2008 12:07:51 -0500, wrote:

No, unfortunately, the moisture is heavier than air and settles in the
tank, where it remains.

Unfortunately, no. Water vapor has a molecular weight of 18, air is
29. Density varies directly with molecular weight.

Casady

So, if you fill a balloon with water, it will fly? Amazing! Does NASA
know about this?

What part of vapor didn't you understand?

Casady

Okay, so you are claiming that if I fill a balloon with water vapor
and let go of it, it will float upwards? Why didn't they fill the
Hindenburg with Water Vapor?

Just make sure the temperature is above boiling point.

Casady

In article ,
wrote:

Okay, so you are claiming that if I fill a balloon with water vapor
and let go of it, it will float upwards? Why didn't they fill the
Hindenburg with Water Vapor?

Obviously SaltyDog has NEVER seen a CLOUD, floating by while he is out
sailing..... what are clouds made out of??? wait for it.....
Water Vapor..... do clouds go UP in elevation.... wait for it....
Yes, they do... therefor Water Vapor MUST be lighter than Air in some
circumstances..... Duh..... Grade School Science must have been on a
day Salty skipped school....

"You" wrote in message
...
In article ,
wrote:

Okay, so you are claiming that if I fill a balloon with water vapor
and let go of it, it will float upwards? Why didn't they fill the
Hindenburg with Water Vapor?

Obviously SaltyDog has NEVER seen a CLOUD, floating by while he is out
sailing..... what are clouds made out of??? wait for it.....
Water Vapor..... do clouds go UP in elevation.... wait for it....
Yes, they do... therefor Water Vapor MUST be lighter than Air in some
circumstances..... Duh..... Grade School Science must have been on a
day Salty skipped school....

Clouds are a hoax. They are actually hydrogen-filled blimps covered with
cotton balls. Rain is caused by sprinkler systems attached to the blimps.
Thunder is what happens when two blimps collide.

On Fri, 14 Nov 2008 19:16:33 GMT, You wrote:

Obviously SaltyDog has NEVER seen a CLOUD, floating by while he is out
sailing..... what are clouds made out of??? wait for it.....
Water Vapor.

The thing that makes clouds visible is droplets of liquid water. The
air is pretty much saturated with water vapor, of course. Usually
clouds rise because they are warmer. That means less dense. The water
vapor is in fact less dense, but the temperature effect is much
larger.

Casady