Dave Luff wrote:
 > Sorry Andy, but you're a bit off track here.  The mixture is the ratio
 > by *mass* of the air and fuel being drawn into the cylinders.

We're talking about different things.  The value controlled by the red
lever is a volumetric ratio; think about how the carburetor venturi
works, and you'll see how this must be.  Clearly you already do:

 > The *carburretor* works on a volume ratio.
 > [...]
 > The fuel injectors are set up to mimic the carburretor

Bingo.  I'm talking about "mixture" in the sense a pilot would use it:
the position of the red lever in the cockpit.  Clearly there are other
definitions.  And this, by the way, is exactly what I meant about no
one defining mixture properly.  You read a textbook and get one
answer, a flight instruction manual and get another. :)

A pilot who moves the red lever thinking it controls the mass ratio
will get it wrong.  Likewise, an FDM author who wires the
/controls/mixture[0] property to the mass ratio will get wrong
behavior.  Whether you call that thingy "mixture" of "redness" is
kinda academic.

 > Please lets never again talk about having enough fuel to burn all
 > the oxygen.  Lets talk about having enough oxygen to burn all the
 > fuel.

You say potato, I say potato...

Seriously, you can look at the problem both ways.  Why doesn't an
engine work in a vacuum?  Surely you wouldn't argue that it is because
there's too much fuel. :)

Andy

-- 
Andrew J. Ross                NextBus Information Systems
Senior Software Engineer      Emeryville, CA
[EMAIL PROTECTED]              http://www.nextbus.com
"Men go crazy in conflagrations.  They only get better one by one."
 - Sting (misquoted)



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