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Date: Fri, 02 Oct 1998 09:07:06 -0500
From: Snowbird <snbird@ibm.net>
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Subject: Re: Sacred Art of Mixture Control (Re: Sudent using KATANA?)
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Andrew M. Sarangan wrote:

Snowbird wrote:
> >Many (including my mechanic) would say, *leaning
> >during taxi* is a pretty bad practice.  Clearly, the damage caused
> >by one failure to enrichen prior to takeoff can be much more serious
> >(and expensive) than some plug fouling.  For this reason, I don't
> >know of a single FBO in my area which encourages leaning on the
> >ground.
 
> Huh ?

I've already said more than I want to on this subject.  All I can
say is, find out what carburator is in the planes you fly and learn
how its idle fuel flow works.
 
> In some places if you don't lean for taxi, you might not even make it
> past the ramp. The way I like to do at high altitudes airports 

Out of curiousity, what do you call a high altitude airport?  The
highest altitude I've flown was into Moriarty, NM on a warm, low
pressure afternoon (DA about 8000).

I noticed no difficulty in the plane starting or idling with the
mixture full rich, nor taxiing.  I did notice a bit more than the
usual 25 rpm increase when I leaned it out almost to idle cutoff
for a prolonged taxi.  Maybe 75 rpm instead.  The engine didn't
sound rough prior to leaning.  Of course I leaned during runup, 
and checked this at full power prior to takeoff.

> Hmm.. sounds like I am supporting Hilton's point....

Which point?  That the Katana (in which you trained as I recall)
is a bad trainer because students who fly Katanas don't learn
manual mixture control well enough to transition to other planes
and other conditions (ie high altitude) safely after they earn their
PPL? 

Frankly, I wouldn't want to do a lot of flying at that kind of
density altitude (8000 ft or above) without training from a pilot
experienced at these conditions.  It's not proper mixture use which
would concern me; it's the way the plane handles and flies, esp.
in strong winds.

Snowbird

