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Europa-List: Fuel consumption - Cold day

Subject: Europa-List: Fuel consumption - Cold day
From: Paul McAllister <paul.mcallister@qia.net>
Date: Sun, 18 Dec 2005 21:48:35

Hi all,

For some reason that is hard to explain, I took my airplane out flying today
when it was really, really cold.  I guess I hadn't had a "Europa fix" for 3
weeks.

Anyhow, the OAT was -13 centigrade and I noticed that my fuel burn for the
same power settings was significantly lower.  At 28" @ 5000 I usually run at
5 US gallons an hour.

Today it was 4.2  I was wondering what was the major contributing factor.
For example, given that it was so cold, would the fuel density been
significantly different and I was still burning at the same pounds / per
hour rate, or was the dense air allowing the propeller / airfoil to be that
much more efficient ?

Second question for those that are more familiar with Bing carburetors.
When I reduce power from around 28" to 23 " the EGT's spike.  If I do it too
quickly then the will hit the maximum allowable temperatures.  Why is this,
and is there an adjustment that I can make ?

Paul



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