"Kyle Boatright" wrote in
:


wrote in message
news:99678464-7bae-4911-931b-4b5bd798fc75
@n58g2000hsf.googlegroups.com.
.. On Mar 2, 8:37 pm, "Kyle Boatright"
wrote:
I suspect the moisture in the air made your engine deliver less
power, therefore fewer RPM...

More water per cubic foot of air = less of everything else,
including oxygen.


So, on that volkswagon / SUV parcel size chunk of air, would the air
be less dense? I am not quite sure I understand what you mean above,
but what you describe above, I perceive you saying more dense as the
prop would have to work harder to slice through moisture laden air.

Everything I have read so thus so far, deals with the air in general
going up, is less dense, but nothing within a "benign" fair weather
cumulus cloud. Air below a stratus cloud is more dense then the
stratus cloud itself, and above the cloud is even less dense.

I think I will post to a weather forum and see if they can answer the
meteorological portion of that question.

Allen

The air density doesn't change, but the amount of oxygen per cubic
foot does. Imagine a one cubic foot in size. It is full of red balls
(nitrogen), white balls(oxygen), and green balls (CO2). It won't hold
another ball without removing something. Now, you have to add a bunch
of black balls (H2O). Which means you have to take out some red,
white, and green ones to make space. Now your 1 cubic foot box holds
less nitrogen, oxygen, and CO2. This is essentially what happens when
the humidity rises. What it means to a combustion engine is that the
engine won't produce as much power, because there is less oxygen per
cubic foot (or whatever) of air.

http://www.csgnetwork.com/relhumhpcalc.html



Bertie