Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml@lancaironline.net
Date: Thu, 06 Nov 2003 15:39:02 -0500
Message-ID: <redirect-2712751@logan.com>
From: "Rudolf Winter" <winter@winsysteme.de>
Subject: Re: paint colors
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The german LBA requested a extensive evaluation of our red 235. Carsten
Sundin from Lancair wrote the following email:

>>>
Dear Bernhard Saneke,

 Your aircraft was built with 250 deg F. (121 deg. C) cure Hexcel 7781
prepregs. The Tg for the materials is 210deg. F or 98 deg. C)  Our
testing shows a white surface will reach 160 to 165 deg. F (71 to 74
deg. C) on a 30 degree C. day in direct sunlight. A red surface will
rise to 195 deg. F (91 deg. C) under the same conditions. Hence, the
materials of your red Lancair 235 are within the limits on a 30 degree C
day in direct sunlight.

Sincerely,

Carsten Sundin
Engineering
<<<

In addition an Airbus engineer tested the Lancair prepreg material. He
came to the conclusion that a completly heated structure of up to 77=B0 =
C
under conservative practical conditions (wet and warm) is safe. He
mesured a maximum skin temperature of 85=B0 C at an OAT of 40=B0 (sun =
angle
45=B0).  If you consider that while rolling to takeoff your plane will
cool down the skins a few degree a light red seems to be safe.

With these informations the LBA (FAA) certified our plane.

Rudolf Winter
LNC235 99% LNC IV <10%
=20