Simviation Forum - Anyone know what this is?

Nov 24^th, 2005 at 10:53am

Omag 2.0 Offline
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Strange picture... they claim it to be a MD-81... but I'v never seen engines like that... looks like some sort of propellors on the far end of the engine...

Airliners.net picture

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Reply #1 - Nov 24^th, 2005 at 10:58am

beaky Offline
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It is an 81(I think); those are experimental propfan engines that I've seen before. More info here:

http://www.aerospaceweb.org/question/propulsion/q0067.shtml

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Reply #2 - Nov 24^th, 2005 at 11:04am

Omag 2.0 Offline
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Yup.. that's the one... interesting read... thanks Rottydaddy!

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Reply #3 - Nov 24^th, 2005 at 11:08am

Souichiro Ex Member

You do know that there are loads of comments further down which explain it.... Grin

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Reply #4 - Nov 24^th, 2005 at 11:51am

C Offline
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We had this discussion a year or so ago. It did the rounds of the major airshows in the late 80s or early 90s...

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Reply #5 - Nov 24^th, 2005 at 8:09pm

Rifleman Offline
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As the three letters on the shroud allude to, .....it's an Un Ducted Fan............simple innit ? Roll Eyes

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Reply #6 - Nov 24^th, 2005 at 8:14pm

Jared Offline
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Interesting concept, always neat to see innovative ideas..

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Reply #7 - Nov 24^th, 2005 at 8:29pm

Hagar Offline
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I posted this in the Photos forum some time ago.

Taken with my old SureShot Zoom at the Farnborough Air Show. I believe it was static only & I never saw it in the air. I also saw a twin very much like the one in that Anet photo at the same show. I forget the year but could probably find out.

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Reply #8 - Nov 25^th, 2005 at 11:21am

Ivan Offline
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That one on the Ilyushin isn't a UDF, but the prototype for the An-70 engine (which is an improved NK-12). 13 fan blades in total on two shafts, 8 on the front prop and 5 on the back.

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Reply #9 - Nov 25^th, 2005 at 11:30am

C Offline
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Quote:

That one on the Ilyushin isn't a UDF, but the prototype for the An-70 engine (which is an improved NK-12). 13 fan blades in total on two shafts, 8 on the front prop and 5 on the back.

I think that was the conclusion we came to last time Doug posted that shot... Wink

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Reply #10 - Nov 25^th, 2005 at 12:50pm

beaky Offline
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Here's a question: what became of this? Seemed like a good idea...

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Reply #11 - Nov 25^th, 2005 at 3:40pm

C Offline
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More economical small turbofans I suppose...

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Reply #12 - Nov 26^th, 2005 at 7:12pm

WesFlight Offline
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Quote:

Here's a question: what became of this? Seemed like a good idea...

From what I picked up on was the safety concerns that whet with it. As it stands now, a duct engine seems safer because of its contained status. If a bird fly into a ductengine it simply get chopped up and spit out the back. Although there are accounts of birds hitting turboprops and becoming deadly projectiles.

Also, I am not sure, but I am pretty sure turbofans run at a must higher RPM than turboprops do. This engine is not really a turboprop, but a turbofan, not inside a duct.

Also, here in America we all know how airlines operate. Dont change a thing untill it is a matter of life and death. We all know arlines could pay for better equipment that would be more efficiant, but then again there are airlines that would just assume to fly whatever and charge you more.

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Reply #13 - Nov 26^th, 2005 at 7:18pm

Hagar Offline
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Quote:

From what I picked up on was the safety concerns that whet with it. As it stands now, a duct engine seems safer because of its contained status. If a bird fly into a ductengine it simply get chopped up and spit out the back. Although there are accounts of birds hitting turboprops and becoming deadly projectiles.

Good point.

Quote:

Also, I am not sure, but I am pretty sure turbofans run at a must higher RPM than turboprops do. This engine is not really a turboprop, but a turbofan, not inside a duct.

I could be wrong but I think the turbofans are quieter.

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Reply #14 - Nov 27^th, 2005 at 2:32pm

Sytse Offline
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So he picked up a couple o' ultralights on the way... Big deal. Grin

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