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Posts: 96
Joined: Fri Jun 29, 2001 12:42 am


Wed Nov 21, 2001 4:57 am

I would like to know more about the General Electric TF-39 Turbofan (C-5 Galaxy). I know that it was the worlds first high bypass turbofan and that the CF-6 is based upon it. Last time I was at an air show I looked in an engine and it appears to have two seperate Fan sections. There is an inner fan and an outerfan with seperate vain angles that then must counter-rotate. How is power supplied to the outer section?
This must also contribute to it's unmistakeable sound.

Please fill me in.

RE: TF-39

Thu Nov 22, 2001 3:36 am

The USAF is going to replace the GE TF-39s on all of it's C-5 Galaxy fleet to a version of the GE CF6-80.
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Joined: Wed Nov 07, 2001 11:32 am

RE: Tedski

Thu Nov 22, 2001 7:32 am

Have you heard a timeline for when this is supposed to start?
Posts: 1952
Joined: Sat Mar 18, 2000 10:09 pm

RE: TF-39

Thu Nov 22, 2001 10:26 am

yes the Tf-39 is the grand-daddy of all the high bypass turbofan engines. it is a 1 and 1/2 stage fan ( no there is no counter-rotation there ). its supposed to start getting new avionics in 2002 and engines start in 2005. but with the C-17 program constantly taking money from the RERP program it may never happen.
"damn, I didnt know prince could Ball like that" - Charlie Murphy
Posts: 555
Joined: Wed Nov 07, 2001 11:32 am

RE: TF-39

Thu Nov 22, 2001 2:45 pm

I crewed 141's until they were retired from the base I'm at. I would still like to see the C-17 live up to the hype it was sold for...

Crew chief or specialist, Galaxy5?
Posts: 1952
Joined: Sat Mar 18, 2000 10:09 pm

RE: TF-39

Thu Nov 22, 2001 9:40 pm

nope im an Engineer.
"damn, I didnt know prince could Ball like that" - Charlie Murphy


Sat Nov 24, 2001 9:16 am

GE Supporting Lockheed Martin in C-5M Modernization Program

ORLANDO, Florida - GE Aircraft Engines is aggressively supporting Lockheed Martin Corporation in the proposed C-5M Modernization Program, under study by the U.S. Government, as the best method for dramatically improving U.S. Air Force airlift capability.
In 1997, Lockheed Martin selected GE's CF6-80C2 engine, the best-selling modern turbofan for commercial widebody aircraft, for the re-engining component of the C-5M program based on the engine's industry-leading performance and reliability.

The C-5 Galaxy, powered by four new CF6-80C2 engines, would experience more than a 25 percent reduction in operating costs through dramatically higher reliability and performance, including 30 percent less takeoff roll, 58 percent less time to climb, and a 38 percent higher initial cruise ceiling.

The CF6-80C2 engine will drive the highly favorable economics of the C-5M program because of its extensive development and operational history.

An excellent indicator of the engine's widespread popularity in the commercial aviation industry is this year's delivery of the 2,500th CF6-80C2 engine to Boeing for installation on a 747-400 delivery to EVA Airways of Taiwan.

Citing performance, safety, value, and reliability, CF6-80C2 customers have ordered more than 300 engines in 1997-98 alone for Boeing 767, 747 and MD-11 aircraft.

In 1998, the CF6-80C2 was launched into military service with the delivery of two Boeing 767 AWACS (Airborne Warning and Control System) aircraft to the Japan Defense Agency (JDA). The JDA launched the 767 AWACS program with four aircraft, representing the first tactical application for the CF6-80C2 engine.

In 27 years of service, the CF6 family of engines has achieved remarkable levels of reliability while accumulating almost 200 million flight hours in the fleets of more than 150 airline customers worldwide. Overall, CF6 engines have a dispatch reliability rate of 99.94 percent.

The -80C2 is the powerplant for Air Force One, a Boeing 747-200, which serves as the official aircraft of the president of the United States. Designated the F103-GE-102 for U.S. Air Force service, the engines power two aircraft that have logged more than 20,000 engine flight hours.

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Joined: Wed Aug 15, 2001 1:33 am

RE: TF-39

Tue Nov 27, 2001 5:51 am

Here's a little more info for you B1C17L1011:

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