> 'I think it must be easier to do the calculations with airplanes. They operate in a homogeneous and compressible fluid.'

within limits, which nearly always apply, I think its easier too

it is rare for aircraft to do something original, and everything is organised around conventions. You can almost design an aeroplane from a data set of statistics. theres an author of a book 'Design of the Aeroplane' Darrol Stinton who virtually depends upon it. Start with an expected weight and the entire parts list can be mapped out. Its also true that aircraft design has been held up since the end of the second war because of adhering to the same conventions.

In respect of everything else its still fluid dynamics

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