411A From United States of America, joined Nov 2001, 1826 posts, RR: 9 Reply 4, posted (6 years 11 months 1 week 5 days 14 hours ago) and read 5612 times:
'Tis a two stage engine, LP and HP commpressor stages, with a provision for LP by-pass air, not a true fan engine.
Very reliable, but also very noisey.
SFC not as good as a JT3D, but quite an improvement over the JT4A.
B707 Conway fuel consumption was approximately 15% less than a JT4A, 4% more than a JT3D, but also slightly more thrust, especially at higher altitudes, where the Conway excelled.