747400sp From United States of America, joined Aug 2003, 3301 posts, RR: 2 Posted (6 years 11 months 3 weeks 3 days 23 hours ago) and read 6564 times:
Since the C-5 galaxy is changing there engines from TF-39 and replacing them with CF-6-80 it got me to thinking. I always thought the TF-39 and CF-6 was basically the same engine. Until I saw how much bigger the the diameter of TF-39 is compaired to the CF-6-50 ( 100 inches vs 86 inches). Also the TF-39 has a shorter engine cowl than the CF-6. Is the only reason the CF-6 is based on the TF-39 is because of the core and that they both high by-pass turbo fans?
AeroWeanie From United States of America, joined Dec 2004, 1600 posts, RR: 52 Reply 1, posted (6 years 11 months 3 weeks 3 days 22 hours ago) and read 6553 times:
The TF39 has a strange 1 and a half stage fan. The first set of blades only goes out to 50% span. Everything outboard of that is fixed. The CF6 has a more normal single stage fan.
DC-10Tech From United States of America, joined Jun 2001, 298 posts, RR: 3 Reply 2, posted (6 years 11 months 3 weeks 3 days 17 hours ago) and read 6516 times:
The TF-39 was the predecessor to the CF6 family and is more closely related to the CF6-6D/K engines (found on the DC-10-10) than the CF-6-80. The -50 and -80 series engines have additional LPC stages that greatly supercharge the air that is fed to the core, giving them much more thrust than the TF-39/CF-6-6 motors.
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