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Green Death
Kirt's Cogitations™ #110

These original Kirt's Cogitations™ may be reproduced (no more than 5, please) provided proper credit is given to me, Kirt Blattenberger.

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   Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted thought or
                                        reflection; meditation; contemplation.
   Kirt [kert] – proper noun: RF Cafe webmaster.


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Green Death

Did extreme environmentalism contribute to the Columbia's demise? The Freon foaming agent for the spray-on foam insulation used on the shuttle's main fuel tank changed in the mid 1990s when a concern was raised about the Freon's affect on the ozone layer. Freon worked perfectly and without a separation failure since the inception of the shuttle program. The new foaming agents use water and pentane, which traps moisture and subsequently weakens the foam's adhesion to the primer on the surface of the fuel tank. The problem is exacerbated at high altitudes due to trapped gas expansion in the foam's cells. Numerous instances of foam swelling and breaking off has been reported since the switch. A separated piece of foam that struck the left wing leading edge at takeoff is the prime suspect for causing the Columbia's reentry breakup on February 1, 2003.
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RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
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