Taken from yahoo
Qoute
The company has now demonstrated a lightweight heat exchanger that pre-cools incoming air from 1000 degrees Celsius to minus 150 degrees in 1/100th of a second - six times faster than the blink of an eye - without blocking pipes with a layer of frost.
http://uk.news.yahoo.com/london-sydney-spaceflight-edges-closer-162046726.html
Regards Peter
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