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The most obvious difference is that they have become bigger to accommodate larger fans.
In addition, the newer engines are larger and therefore can have bigger fans mounted in the front; larger fans propel more air around the engine core, adding thrust by acting like a giant propeller within the engine.
Pratt & Whitney spent more than 20 years and $1 billion developing its new geared turbofan engines, which use larger fans (up to 81 inches in diameter on the A320neo) and a gearbox to make the fans rotate more slowly than the internal turbine that drives them, making them more efficient than traditional engines.
According to the NREL, small to medium sized fans can cool an area up to 6-feet in diameter, while larger fans are effective up to 10 feet.
New engines with larger fans also slow exhaust air speed, for even more noise reduction.
Working with the major aircraft engine manufacturers, NASA has been able to reduce the former sound by designing engines with larger fans.
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Her team has a larger fan base than L.A. and arguably more to risk.
I'm not sure if La Salle will have a fan base, but I know we will have a larger fan base than them".
This occurs up until a certain point, at which further increases in output are offset by larger fan power consumption rates.
Each of these breakthroughs allowed the very top acts to reach a larger fan base, and thus command a larger audience and a bigger share of concert revenue.
Celtic, and Rangers, have larger fan bases than most English teams, but their revenues are miniscule in comparison.
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