Don't forget the inherent display bug on all RAF ASI's .... that is the needle drops rapidly in response to G. You can drive the RAF ASI any way you want with minor applications of G. So any time you are pulling G the RAF ASI bug will result in a grossly low IAS that bears no resemblance to your real IAS. The German ASI's are not "afflicted" by this bug.
The current bug renders the RAF ASI totally useless as a manoeuvre/energy cue. its only useful in 1G flight.
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