-----Original Message-----
From: Albert D. Helfrick [mailto:Albert.Helfrick@erau.edu]
Sent: Friday, 15 December, 2006 1037
To: rjansson(a)cfl.rr.com
Subject: Re: Heat Sink Parts
Goood Morning Dick,
Just let us know what else we can do to help; both electrically and
mechanically.
Al
-----Original Message-----
From: "Dick Jansson-rr" <rjansson(a)cfl.rr.com>
To: "AMSAT Eagle " <eagle(a)amsat.org>
Date: Fri, 15 Dec 2006 00:35:31 -0000
Subject: Heat Sink Parts
Greetings:
AMSAT's Eagle Project has just today received a sample collection (4+) of
E05 01 Heat Sinks fastidiously machined by our friends at Embry Riddle
Aeronautic University, Daytona Beach, Florida. This is the culmination of
discussions started over a year ago. These heat sinks are designed to be
riveted into Eagle's high-power electronic modules so as to enable the
dissipation from the power devices in those modules. Such a heat sink will
help couple the dissipated power to the spacecraft for its ultimate
rejection to the space heat sink (temperature: 4K).
We are very much indebted to ERAU and Dr. Al Helfirck, K2BLA, a very
long-time operator, for their participation in the Eagle Project.
What makes these heat sinks very special is that they are machined from a
high thermal conductivity, 99% pure, aluminum. This alloy is 33% higher
conductivity than alloy aluminum, and as such it is quite soft and difficult
to machine. In addition, the surface finish of these parts is also demanding
and ERAU has presented us with a superb product. The need for this kind of
finish is, again, a thermal issue.
When experimenters are presented with these heat sink modules to work with
their surfaces will be protected by a plastic film, of which we have a
quantity. Such a protective film will be used on most all thermal conductive
and radiative surfaces of importance, as they all are of delicate and soft
alloys.
A tip of the hat to Al and his gang.
Dick Jansson
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