As an aside to this, my father was on the Vulcans during the 50's. Some bright spark designed a jig to " 5th pod" an Olympus into the bombay of a Vulcan. The idear was that you could get a spare engine anywere in the world in a matter of hours in a Vulcan. The two engine stands, the mini hoists, all the tools and the team of men to do it would then be loaded into a Beverly and then trundle off at about 150kts and take three days to catch up!. Needless to say the idear was not used very often!.
Rgds Dr.I.