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Old Jan 4, 2016 | 8:15 am
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jrl767
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Originally Posted by YVR Cockroach
As far a 707s go, didn't the early ones have turbojets (exhaust looked somewhat like big star-shaped cookie cutters) and later ones have low-bypass turbofans? Same with DC-8s with the last UA examples having been re-engined with CFM56s? ...
yes, the initial 707s (model numbers -120, -220, and -320) were powered by the "straight-pipe" P&W JT3C and JT4A turbojets; the -420 had the Rolls-Royce Conway engines ... the JT3D turbofans came along a few years into production (model numbers with "B" and "C" suffixes); many early models were retrofitted

the DC-8-10, -20, and -30 also had the JT3C or JT4A engines; the -40 was a Conway-powered variant ... the -50 as well as the -60 stretch aircraft were delivered with JT3D turbofans; all the CFM56-powered -70 series were conversions
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