Leaning the mixture in a Mustang   
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Leaning the mixture in a Mustang

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"seeker"

Usenet Poster
seeker@youwhish.com
Posted on:
Nov 10, 2007, 9:21 PM

Post #1 of 4 (24 views)
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Leaning the mixture in a Mustang Not logged in -   Reply 
Being an FSX beginner, I fly with "flying tips" enabled.

I quite often see a message saying something to the effect that I'm loosing
power because the mixture hasn't been leaned properly; and that I should
press control + X to fix it.

This happens with altitude changes (which I'd expect) and most often in high
power props such as the P-51 supplied with the Acceleration expansion.

Seeing as it's my aim to eventually turn the flying tips off, I need to find
out:

1) What are the symtoms of an over rich mixture that I should look for
(other than engine smoke, I haven't really seen that in FSX; although it's
readily apparent in IL-2 under the same conditions). Is there a guage I
should be looking for, such as cylinder head temps or similar?

2) Conversly, how should one recognise an overly lean mixture when
descending?

Seeker







Cichosz

Usenet Poster
Cichosz@discussions.microsoft.com
Posted on:
Nov 24, 2007, 12:11 AM

Post #2 of 4 (21 views)
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RE: Leaning the mixture in a Mustang [In reply to "seeker"] Not logged in -   Reply 
I have not flown the mustang, however, many aircraft operate the same way if
they have a mixture control. First off, the mixture control controls the
fuel air mixture, so any change in altitude will change the amount of air
available. In a real aircraft you have to lean the mixture (pull it back or
out) until the engine runs or sounds rough. You must then note the
Temperature on the EGT (exhaust gas temp) You then enrichen (push in or push
forward) about 100 degrees F. lower than the temperature when the engine ran
rough. That should lean the fuel air mixture to a best power setting. Hope
this helps.



Cichosz

Usenet Poster
Cichosz@discussions.microsoft.com
Posted on:
Nov 24, 2007, 12:15 AM

Post #3 of 4 (21 views)
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RE: Leaning the mixture in a Mustang [In reply to "seeker"] Not logged in -   Reply 
I did not notice your second question until now, some pilots remember the EGT
setting that worked and move the mixture control to keep that EGT. Just
remember if you climb you lean the mixture if you descent you enrichen the
mixture. Or you can just do like I said in the other message and find the
100 Degrees Rich of Peak (engine roughness).



"seeker"

Usenet Poster
seeker@youwhish.com
Posted on:
Nov 24, 2007, 5:17 AM

Post #4 of 4 (21 views)
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Re: Leaning the mixture in a Mustang [In reply to Cichosz] Not logged in -   Reply 
Thanks for the tips!

I imagine that exhaust gas temprature relates more to turbo props? I didn't
actualy realise that one should adjust the mixture on those too; allthough
logicaly it makes sense one would.

My original question was more in regard to piston engines (such as the
Merlin in the Mustang). I would normaly associated an overly rich mixture
with a reduction in power and excessive smoke. I haven't noticed smoke in
FSX yet, and I'm missing any other visual tips to tell me of the engine
state.

Should one notice a drop in induction pressure (inches of mercury) if the
engine loses power? Should engine temprature fall?

Conversly would engine temprature rise with a too lean mixture? Especialy
cylinder head temps?

Seeker


"Cichosz" <Cichosz@discussions.microsoft.com> skrev i meddelelsen
news:FA47F957-3ECB-4E70-A377-338C3666A403@microsoft.com...
>I did not notice your second question until now, some pilots remember the
>EGT
> setting that worked and move the mixture control to keep that EGT. Just
> remember if you climb you lean the mixture if you descent you enrichen the
> mixture. Or you can just do like I said in the other message and find the
> 100 Degrees Rich of Peak (engine roughness).




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