why do most airplanes use two spool engines?
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A spool is another turbine. Some engines have 3 or more to extract as much air as possible
Each turbine controls a part of the engine.. let it be a compressor or the front fan blade!
Source: here’s a fun little post from General Electric. One of the main manufacturers of engines, https://www.geaerospace.com/sites/default/files/t901-what-is-a-spool.pdf
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