Moderators: richierich, ua900, PanAm_DC10, hOMSaR

Topic Author
Posts: 423
Joined: Thu Aug 02, 2001 5:44 am

The GE-UDF Engine

Thu Nov 29, 2001 10:46 am

Yes it is quite an old project between Boeing and GE that was tested on the 727.

What was its concept?
Wasn’t it supposed to be mounted on the later terminated 7J7 project?

Click for large version
Click here for full size photo!

Photo © AirNikon

Any Information would be appreciated.

"Saudia Three Five hold short Three One Right"
Posts: 66
Joined: Wed Aug 15, 2001 1:33 am

RE: The GE-UDF Engine

Fri Nov 30, 2001 8:06 am

Basically the concept was a high bypass unducted fan that was more fuel efficient and quieter than comparable turbofans. It was a pretty complex machine, the fan blades were mounted on separate spools that counter-rotated. The turbines were integrated into the hub of the fans and the two counter-rotating turbines intermeshed, so there were no stators. Does anyone know of a website with good information about this engine? Here's some more info though:
Posts: 5495
Joined: Wed Mar 01, 2000 11:10 am

RE: The GE-UDF Engine

Sat Dec 01, 2001 5:52 am

McDonnel Douglas also put one on an MD-80, there are pics in this database. I have seen the actual engine, it's in the Paul Garber museum near Andrew's AFB.

The problems were that, while it was much more fuel efficient, the cost of fuel dropped sharply. It was not worth it's expense. Also, in spite of the claims that it was really quiet, anyone (the tour guide to the museum) who had heard it run say it was unbearably loud, and that it came nowhere near meeting stage three requirements in their opinion.

Good idea, bad timing.

I would also think that it would be very vulnerable to FOD.

User avatar
Posts: 2461
Joined: Fri Feb 18, 2000 7:48 am

RE: The GE-UDF Engine

Mon Dec 03, 2001 3:16 am

There is another MD-80 UDF engine in the Pratt & Whitney museum in Hartford, Ct.
This plane is built to withstand anything... except a bad pilot.
Posts: 715
Joined: Fri Aug 17, 2001 11:25 am

RE: The GE-UDF Engine

Wed Dec 05, 2001 2:30 pm

Many years ago I attended a Line Maintenance class at a major engine OEM that was also attended by a mechanic on this project. He mentioned that anti-icing of the UDF blades was dependent on the heat from the turbine exhaust. During cold weather testing it was found that the blade tips would accumulate enough ice to set up an unacceptable amount of vibration.

I know, it's just shop talk, but I find it believable.

Who is online

Users browsing this forum: bananaboy and 32 guests

Popular Searches On

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos