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*The important thing is that the separation line be transverse, and circular or elliptical.
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Maybe the cut-out for visibility is mitigated by being within the influence of the main body.
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*The ramp angle of the ring-vortex generator may be critical,although Morelli's research, as of 2000, is not mature enough to say.
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For every optimal ramp angle there will be a corresponding step transition? Does the step have any advantage over a ramp?