Date: Mon, 30 Oct 2000 08:10:39 -0600
From: kenharw <kenharw@swbell.net>
Subject: Air Conditioning
To: "Michael J. Eakman" <mjeakman@solarmasters.com>
Cc: Lancair List <lancair.list@olsusa.com>
Message-id: <39FD815E.BB90BAC6@swbell.net>
Reply-To: lancair.list@olsusa.com
Mime-Version: 1.0

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1. Aircraft Insulation:  I too, have insulation with aluminum backing.
It is the type used on airliners.   It is about 3/16 inch thick has a
real soft gooey foam on one side with adhesive backing.  You just cut it
out to the right pattern and slap it on the inside of the cabin.   It
makes a good thermal and sound insulation.   It is not cheap, however.
On the plus side, you don't need very much in a 320/360.  This
insulation was installed 9 years a go when I was building the plane.   I
have no antennas located in the cabin forward of the seat back.  I have
no foil backed insulation on the sides of the plane behind the seat
back.  For vertical 1/4 wave antennas which mount onto the fuselage,
such as the transponder and DME antennas, you need a ground plane
anyway, so the foil actually helps, as long as it is grounded to the
side of the antenna.   You CANNOT use foil backed insulation near a
dipole type antenna, i.e., one that looks like a ribbon.  You cannot use
foil anywhere near the embedded marker beacon antenna or any embedded
communications and/or navigation antennas.   By-the-way, you usually
cannot use carbon fiber in these areas either, unless you know something
about stealth technology antennas (has anyone ever wondered how the B-2
bomber communicates?  Don't ask.).

2. Air conditioning:  Weight of my A/C system is about 53 lbs.  Since
the evaporator goes where the header tank used to be the weight
difference is just about a wash, i.e., no weight increase but you loose
the fuel capacity of the header tank.   CG actually goes forward with
installation of the A/C which is a good thing for most builders of the
Lancair.  Evaporator capacity is huge, so the system performs
marvelously.  No, there is no appreciable effect on the magnetic compass
from the evaporator blower motor.

Hope this helps,
Ken

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