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To: SandRat
The "Open Rotor" design is very efficient and has been around for a long time. It's a very well known concept in the aviation industry. When I worked for McDonald Douglas in the late '80's they were trying to develop them for the MD-80 series aircraft. The called it UHB, for Ultra High Bypass.

Most commercial jet engines today are High Bypass variety where 80% or so of the thrust comes from the fan, and not the jet portion of the engine. The UHB was just the next logical progression. Get rid of the fan shroud which is restrictive and is installed only to control noise. But that was the big hang up, however. They are much louder than conventional turbofans, and could not meet the rather strict, in many cases, airport noise ordinances in most communities.

So we continue to pollute more so people who buy houses around airports and still hear the crickets chirp.

Ain't government wonderful?

25 posted on 06/06/2006 8:47:46 PM PDT by Jotmo ("Voon", said the mattress.)
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To: Jotmo
So we continue to pollute more so people who buy houses around airports and still hear the crickets chirp.

I understand the sentiment. I know of one airport in the middle of a suburb where 100% of the homes surrounding it were built years after the airport was established.

OTOH, less noise is always good. Maybe Boeing should talk to the Navy to see how they get their screws so quiet. Water, air, it's all just fluid dynamics.

46 posted on 06/07/2006 6:56:12 AM PDT by antiRepublicrat
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To: Jotmo

The loudest plane on earth is the Tu-95. In some ways, ahead of its time.


60 posted on 06/09/2006 2:02:17 PM PDT by GOP_1900AD (Stomping on "PC," destroying the Left, and smoking out faux "conservatives" - Take Back The GOP!)
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