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I found that Vno stands for normal operating speed, but I also found the there is a term 'maximum structural curising speed'. It should also be considered the sudden apply / abrupt in smooth air only. Are these the same but just a different name?
Secondly, to define Va & Vb. Should operation in smooth air / turbulence be applied to define Va & Vb? such as Va is only applied in smooth air / both.