I, for one, am fascinated as selfin's explanation goes some way to explaining something that has worried me for some time. I have always found it difficult to reconcile the two statements:
1. On aircraft with Air Data Computers the ASI displays CAS
2. The Air Data Computer calculates CAS using variations of Saint Venant's formulae which assume compressible flow.
Because if #2 were true, the ADC would output what I know as EAS, CAS corrected for compressibility, although it still seems to be called CAS. Is this the case, selfin?