Aviation Photo #0947367 McDonnell Douglas MD-81(UHB) (DC-9-81(UHB)) - McDonnell Douglas

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    Ian Kirby
    McDonnell Douglas
    McDonnell Douglas MD-81(UHB) (DC-9-81(UHB))
    McDonnell Douglas MD-80 (DC-9-80)
    McDonnell Douglas MD-80 (DC-9-80)
    McDonnell Douglas
    48000
    909
    N980DC
    Farnborough
    England
    United Kingdom
    September 1988
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Photo Added: October 28, 2005

Comments (22)

Anonymous
11 years ago
Interesting. What kind of engine is it?
Anonymous
11 years ago
It's an unducted fan (UDF), a type of propfan. If memory serves me correct, Air & Space Magazine recently did a full article on this three or four issues ago. I bet wikipedia also has some information, if you're interested.
Anonymous
11 years ago
They had those GE UDF Aircraft Engines experiments mid 80s... They never got to commercial airliners.
Anonymous
11 years ago
Need an explanation, what kind of engine it is ?
Anonymous
11 years ago
I remember this aircraft very well. It appears in the book "McDonnell Douglas, a tale of two giants". This engine is an experimental GE turbofan with contrapropellers. Only one of these engines was made.
Anonymous
11 years ago
It is an experimental "un-ducted fan" engine. These were supposedly going to be more efficient than traditional jet engines, but numerous concerns kept them from going into production.
Anonymous
11 years ago
Very odd
Anonymous
11 years ago
I think it's called aft-fan or an aft-duct(fan), or something like that..
Anonymous
11 years ago
I read in a book called "Airplanes of the Future" that this was planned for future planes. The design was suppost to be enviormetal by using prop's and engine. But I'm not sure. It is kind of odd though.
Anonymous
11 years ago
Effective bypass ratio is about 40:1 !

Blade containment is problematic.
Anonymous
11 years ago
Why did they not use it was it inefficient or dangerous or what
Anonymous
11 years ago
Looks just great! Thx!
Anonymous
11 years ago
The engine looks so strange!!!
Anonymous
11 years ago
It's really a funny engine that I never seen. But what is the actual purpose of these small wings attached to it ???
Louis, Hong Kong.
Anonymous
11 years ago
I think my Aviation professor talked about this in a systems class. If it is, its almost 90% efficient. It was not used because passengers thought it was dangerous. Same reason passangers prefer Turbofan over Turboprop.
Anonymous
11 years ago
What hapened to the UDF (unducted fan),
why was it never used commercially?
please dont tell me, because the passengers did not like the looks of it, it was never used.
Anonymous
11 years ago
Engineers liked it, but birds vetoed.
Anonymous
11 years ago
I think its not used is because the UDF is too noisy.
Anonymous
11 years ago
I was a small part of that project and we were told that they were't able to get carriers to buy it because oil prices had dropped low enough that the costs of retooling and re-educating the maintenance crews were too high to offset the costs unvolved. It was a great deal more efficient. The core was based on a small fighter jet engine. The double row of fans in the back were counter rotating for balance. It was in-fact louder but not so loud that it couldn't be made to pass noise tests in sensitive areas with some management of the approaches and timing. It was developed in partnership with NASA
Anonymous
11 years ago
I'll bet the airlines wish they had these now, with oil prices pushing 75 dollars a barrel!
Anonymous
9 years ago
I'll bet the airlines wish they had these now, with oil prices pushing 140 dollars a barrel!
Anonymous
8 years ago
Just a prototype!

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