Message-ID: <20011113053747.87440.qmail@web20006.mail.yahoo.com>
Date: Mon, 12 Nov 2001 21:37:47 -0800 (PST)
From: Tammy and Mike Salzman <arrow54t@yahoo.com>
Reply-To: arrow54t@yahoo.com
Reply-To: lancair.list@olsusa.com
Subject: Re: Landing lights in the wingtip
To: glcasey@gte.net, lancair.list@olsusa.com
In-Reply-To: <NEBBIBKBKLGPNKKOGMMBIENAECAB.glcasey@gte.net>
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Gary,

I also plan on installing the landing lights in the leading edge of my
ES wings toward the tips like Pat Weston has done.  
See: http://members.home.net/dylanw12/AppendixOne.htm
Not in the wing tip proper.  Isn't that where the nav lights are
located?  If so, how will your landing light affect the nav light
function?

I did a little heat test where I took my 55 Watt halogen proposed
landing light and placed it into an unvented wooden ammo box.  I paced
the plexiglass material I plan to use over the top of the box.  I did
several runs where I recorded the highest temperature of the light case
and of the plexiglass every minute until it stabilized.  I used an
infrared thermometer for these measurements.  With each run, I varied
the orientation of the light to the plexiglass.  These temperatures
would be the worst case due to not having air moving over the
plexiglass.

Here are some of the results:

Highest light case temp was 258 deg. F stabilized after 1hr 50 min.

Highest plexiglass temp was 160 deg. F stabilized after 50 min. The
lamp was aimed horizontally inside a shaped plexiglass lens.  Values
taken were on the plexiglass 1" directly above the fixture (the hottest
location).

The maximum operating temperature of the plexiglass I am using is 180
deg F.  From this experiment, I conclude that (1) the plexiglass does
not need to be cooled other that what it will get by traveling through
the air.  (2) The light fixture needs to be insulated from the
surrounding structure.  A 1/4" phenolic block should take care of this.
 I will do a similar experiment to verify this later.

What do ya think?

I hope this helps you with your application.  

Mike

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