Historically the labelling is correct. LEAN forward, RICH Back. These settings are not incremental or vernier type. Its either one or the other. In both cases there is an AUTO barometric function to lean the mixture with altitude. These settings should be thought of as "Mixture modes"..... AUTO RICH and AUTO LEAN
AUTO RICH for High power settings ... allows additional fuel to cool the charge.
AUTO LEAN for lower power settings. IRL there was a max boost (+1.5lbs) for use in Auto LEAN/WEAK
The same goes for both the Spitfire and Hurricane. Though in the case of the Spitfire the SIM animation has been reversed.
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