On Wed, 5 Jun 2013 12:03:24 +0100
Roland Perry wrote:
Doesn't a 747 have four engines?

Fair enough. But then apparently I used the takeoff figure for the amount
of air a jet sucks up, not the cruise figure which is somewhat lower.

Anyway, its still a ******** barrel scraping theory similar to the rubbish
Saab came out with in the 90s about their cars cleaning the air because of
their catalytic converters - so how come we still have smog?

Whats more , the engine is optimised to burn all the fuel injected into
it - if some of the O2 is used up burning methane then there will be unburnt
or partially burnt - ie soot - hydrocarbons chucked out the back. How is that
a better situation? Plus the methane on its own would have been destroyed in
about 10 years. The CO2 will hang around for a thousand times longer. Not much
of a trade off I think you'll agree.

--
Spud