EconoBoy
Topic Author
Posts: 152
Joined: Thu Mar 04, 2004 12:10 am

Unducted Fans

Tue Mar 16, 2004 6:48 pm

When I went to the Farnborough air show in 1988, P&W or GE (I forget which) was demonstrating a radical new engine mounted on an MD-80 in place of one the usual engines. The engine was radical because it featured an unducted, contra-rotating fan that had six or eight blades per section. The fan was mounted at the rear of the nacelle. This, apparently, was the next leap forward in engine technology, and I believe that most of the major engine manufacturers came up with similar concepts. So, what I am curious to know is whether the unducted fan concept has been dropped, and if so why. Were there too many technical barriers for example? Are they too noisy?
 
Ndebele
Posts: 2847
Joined: Mon Apr 09, 2001 3:16 am

RE: Unducted Fans

Tue Mar 16, 2004 7:10 pm

Here are some photos of the unducted fan on the MD-80:

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Photo © Frank C. Duarte Jr.
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Photo © Bill Blanchard



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Photo © Paul Dopson
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Photo © AirNikon


Boeing had teh unducted fan tested on the 727:

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Photo © AirNikon



I remember a project called Boeing 7J7, I'm not sure but I think I remember that this project had also something to do with an unducted fan and was based on the 727 as well.
 
mika
Posts: 2810
Joined: Thu Jul 27, 2000 7:53 am

RE: Unducted Fans

Tue Mar 16, 2004 7:12 pm

Wow that looks lika a MD80 Turboprop!  Wow!
 
User avatar
Starlionblue
Posts: 17049
Joined: Fri Feb 27, 2004 9:54 pm

RE: Unducted Fans

Tue Mar 16, 2004 7:53 pm

It was indeed dropped, but I can't recall why.
"There are no stupid questions, but there are a lot of inquisitive idiots."
 
EconoBoy
Topic Author
Posts: 152
Joined: Thu Mar 04, 2004 12:10 am

RE: Unducted Fans

Tue Mar 16, 2004 8:28 pm

Hey Ndebele, nice shots! I didn't have the foresight to take any pictures myself when I was at Farnborough.

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