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Date: Mon, 28 Apr 2008 21:06:53 -0400
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From: "Fred Moreno" <fredmoreno@optusnet.com.au>
Subject:  FW: Intake for IO550
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Hamid asked: Do you have a source for heated air?

No. =20

But I put both the air filter and the alternate air inlet behind the =
spinner
and not in the main flow entering the cowl inlets so that super cooled
droplets will be separated inertially in much the same way that =
turboprops
use inertial separators for the same reason.  The droplets are unable to
make the quick 90 degree turn to enter either the filter or alternate =
air
inlet, and are carried aft to be deposited on the intake manifold tubes
(where they will make ice) or cylinder heads and cylinders (where they =
will
melt and drain downward). =20

Being fuel injected, carb ice is not an issue.=20

Ice crystals from cirriform clouds could be an issue for the air filter,
blocking air flow like a thick layer of dust.  I know it was for my =
TR-182
when flying high in the winter.  Snow was not a problem for the air =
filter
as it was apparently unable to enter the NACA scoop on the side of the =
cowl
that fed induction air to the air filter. =20

The alternate air inlet I have now permits the filter to be bypassed and =
the
engine will happily swallow small ice crystals (and snow  flakes as =
well, I
expect) with no problems if they are able to negotiate that tight bend.
However, being normally aspirated, I very much doubt that I will ever =
climb
to cirrus clouds in this airplane. =20

Fred

-----Original Message-----
From: Hamid Wasti [mailto:hwasti@lm50.com]=20
Sent: Monday, 28 April 2008 4:33 AM
To: lml@lancaironline.net
Subject: Re: [LML] FW: Intake for IO550

Fred Moreno wrote:
> The attached pictures show the induction system I built for the IO-550 =
in
my
> Lancair IV. =20

Do you have a source for heated air? How will the system handle an=20
unplanned icing encounter? Both the Mooney and the Baron (two systems I=20
am most familiar with) have alternate sources that draw warmed air from=20
the engine compartment.

Regards,

Hamid