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originally posted by: Zaphod58
a reply to: Pyle
They're not going to the F108. They rejected going to four engines. They're doing a 1-1, similar weight, similar thrust, significant fuel burn improvement. They found that they can't do a four engine replacement.
They flew the TF39, CF6-6, and CF6-50. They weren't for the B-52 though, they were just because nothing else was big enough to test them at the time.