I agree that EAS is of no practical use. But in that case CAS is of no practical use either. HAS is a largely sufficient concept. And IAS with 3%/5kt of HAS is sufficient to fly an aircraft.
Why would you invent CAS as HAS is sufficient? That was my initial question. English is not my first language, so maybe that's why it has not been clear so far that that was actually my only question.
EAS is the theoretically ideal speed to indicate to the pilot.
HAS is sufficient for practical purposes.
What is the use of CAS?
Last edited by 172510; 11th Jun 2015 at 19:02.