|Quoting tsugambler (Reply 3):|
I would have thought such an upgrade to be prohibitively expensive, but apparently not.
It was worthwhile primarily because of two considerations...
The DC-8 is an extremely robust design, in fact...the initial design service life of the airframe was 100,000 hours, from the get go.
(I know because my dad was involved with the early design)
And, the potential fuel savings AND
performance enhancements using the CFM56 engine were outstanding.
Except for a prototype, not done, because the specific 707 design did not lend itself to re-engining...with the CFM56. and be economical, at the same time.
Many of the later models of the DC-8 contained quite a lot of titanium, which is very light in weight, very strong, and lends itself to a proven robust aircraft design.
The only other aircraft design that contained more titanium, was...the L1011.
The latter, second to none in fuselage strength and robustness.
, manufactured very well in Palmdale.
Ask 474218...he positively knows, as he is (was)...a Lockheed guy.
The Flying Tiger Line operated re-engined DC-8's from HKG to HNL.
Departure from HKG at 357,000 pounds was possible, climbing to FL330...(FL370 after two hours) because of the added thrust thrust of the CFM56, and enabled nearly full payload ops, versus...older DC-8's having to land at PGUM, for enroute refueling.
A win-win scenario.
[Edited 2010-12-08 13:18:07]