October 15th 11, 10:26 AM
posted to uk.transport.london
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First recorded activity at LondonBanter: Dec 2008
Posts: 2,008
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"Heathrow and Gatwick airports: Ministers mull rail link" (twixt
wrote in message
On Fri, 14 Oct 2011 13:18 +0100 (BST)
lid (Paul Cummins) wrote:
under pressure. A Jet Engine is one of the cleanest ways to burn it.
Early jet engines were filthy. Anyone who's seen a 707 or concorde at
takeoff can remember the dirty trails of pollution they left behind.
The latest ones are cleaner but then so are the petrol engines when
combined with a catalyst.
It depends what you mean by 'cleaner' -- catalytic converters make
engines less, not more, efficient in terms of CO2 emissions. What has
made a positive difference is fuel injection. High bypass turbofan aero
engines are more efficient in every way than their low bypass or
turbojet predecessors.
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