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Old 08-03-2012, 08:46 PM   #3515
chazbird
Beastly Adventurer
 
Joined: Jul 2009
Oddometer: 3,169
Yep, that's huge. I knew an engineer at GE who said everyone would go ape-shit happy when a 2-3% increase in fuel efficiency was obtained. The fans (essentially a propeller) on the high by pass and ultra hig-by pass engines now provide 60-80% of the trust, vs the remainder being from the core, which is what all the old turbojets provided. I once and did 4 instrument approaches, to two nearby airports, with a hold or two, all at low altitudes, in a "pure" turbo jet powered Lear 24 and we were definitely needing to stop for fuel when we were done.
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