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Cognate with Saterland FrisianSpoule(“spool”), Dutchspoel(“spool”), GermanSpule(“spool”), Swedishspole(“spool”), Icelandicspóla(“spool; reel”). The aviation usage is based on the visual similarity of one of the spools of a turbine engine to a spool used for thread (especially in cross-section). See also spill.
The high-pressure spool rotates faster than the intermediate- and low-pressure spools, as the high-pressure turbine is driven by superheated combustion gases straight out of the burners, while the high-pressure compressor has to spin very fast to compress air that has already been compressed and heated by the low- and intermediate-pressure compressors.