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Every once in a while, I like to go wading in the "Radical New Aircraft Design" bin that is the United States Patent and Trademark Office. Occasionally I come out with something written in patent speak that only a rocket scientist can decipher and I just stare blankly at, however, this time I came out with a real gem.
I give you Patent Number 20080099633, which was published yesterday, called Aircraft airframe architectures, a wholly innocuous title. An engineer at Pratt & Whitney came up with a radical new design to improve the fuel efficiency of a shorthaul aircraft. Rather than have two engines, the design calls for a "single gas generator core including a forward compressor driven by a rearward turbine about a core axis and configured to remotely drive multiple bladed propulsion elements."
Originally posted by Zaphod58
More power from the engine, because you're using two fans for one engine, so you get essentially twice the BPR.
Originally posted by mtmaraca
All I'm saying is the addition of an extra fan, shafts, ducting, gearbox, etc. doesn't seem to give any significant advantage over a geared turbofan with a single, large fan.
Originally posted by kilcoo316
Its hard to fit a 3m dia fan underneath an A320 wing, so Pratt aren't trying to - instead its two small ones off one core.