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Questions about the propulsive force of a powered aircraft.

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Why is thrust (in a high bypass turbofan for e.g.) non-linear with respect to N1?

I've been studying jet engines for a short while now and I think I have a pretty decent understanding of how thrust is generated, but one thing I'm struggling a bit with is how thrust varies across the … *Edited to add a link to a source which figuratively shows what I mean by the relationship being exponential, this suggests Thrust to be roughly equal to N1^3.5 in this example: …
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